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Commit Graph

12588 Commits

Author SHA1 Message Date
Linus Torvalds
4efdedca93 Small fixes for x86, slightly larger fixes for PPC, and a forgotten s390 patch.
The PPC fixes are important because they fix breakage that is new in 3.15.
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Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

Pull kvm fixes from Paolo Bonzini:
 "Small fixes for x86, slightly larger fixes for PPC, and a forgotten
  s390 patch.  The PPC fixes are important because they fix breakage
  that is new in 3.15"

* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: s390: announce irqfd capability
  KVM: x86: disable master clock if TSC is reset during suspend
  KVM: vmx: disable APIC virtualization in nested guests
  KVM guest: Make pv trampoline code executable
  KVM: PPC: Book3S: ifdef on CONFIG_KVM_BOOK3S_32_HANDLER for 32bit
  KVM: PPC: Book3S HV: Add missing code for transaction reclaim on guest exit
  KVM: PPC: Book3S: HV: make _PAGE_NUMA take effect
2014-05-28 08:08:03 -07:00
Sam bobroff
1739ea9e13 powerpc: Fix regression of per-CPU DSCR setting
Since commit "efcac65 powerpc: Per process DSCR + some fixes (try#4)"
it is no longer possible to set the DSCR on a per-CPU basis.

The old behaviour was to minipulate the DSCR SPR directly but this is no
longer sufficient: the value is quickly overwritten by context switching.

This patch stores the per-CPU DSCR value in a kernel variable rather than
directly in the SPR and it is used whenever a process has not set the DSCR
itself. The sysfs interface (/sys/devices/system/cpu/cpuN/dscr) is unchanged.

Writes to the old global default (/sys/devices/system/cpu/dscr_default)
now set all of the per-CPU values and reads return the last written value.

The new per-CPU default is added to the paca_struct and is used everywhere
outside of sysfs.c instead of the old global default.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:40 +10:00
Sam bobroff
39a360ef72 powerpc: Split __SYSFS_SPRSETUP macro
Split the __SYSFS_SPRSETUP macro into two parts so that registers requiring
custom read and write functions can use common code for their show and store
functions.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:39 +10:00
Rickard Strandqvist
b717d98543 arch: powerpc/fadump: Cleaning up inconsistent NULL checks
Cleaning up inconsistent NULL checks.
There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:39 +10:00
Preeti U Murthy
4750afa2c5 powerpc: Fix comment around arch specific definition of RECLAIM_DISTANCE
Commit 32e45ff43e changed the default value of
RECLAIM_DISTANCE to 30. However the comment around arch
specifc definition of RECLAIM_DISTANCE is not updated to
reflect the same. Correct the value mentioned in the comment.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: KOSAKI Motohiro <Kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:38 +10:00
Michael Ellerman
e2186023f2 powerpc/powernv: Add support for POWER8 split core on powernv
Upcoming POWER8 chips support a concept called split core. This is where the
core can be split into subcores that although not full cores, are able to
appear as full cores to a guest.

The splitting & unsplitting procedure is mildly complicated, and explained at
length in the comments within the patch.

One notable detail is that when splitting or unsplitting we need to pull
offline cpus out of their offline state to do work as part of the procedure.

The interface for changing the split mode is via a sysfs file, eg:

 $ echo 2 > /sys/devices/system/cpu/subcores_per_core

Currently supported values are '1', '2' and '4'. And indicate respectively that
the core should be unsplit, split in half, and split in quarters. These modes
correspond to threads_per_subcore of 8, 4 and 2.

We do not allow changing the split mode while KVM VMs are active. This is to
prevent the value changing while userspace is configuring the VM, and also to
prevent the mode being changed in such a way that existing guests are unable to
be run.

CPU hotplug fixes by Srivatsa.  max_cpus fixes by Mahesh.  cpuset fixes by
benh.  Fix for irq race by paulus.  The rest by mikey and mpe.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:37 +10:00
Michael Ellerman
3102f7843c powerpc/kvm/book3s_hv: Use threads_per_subcore in KVM
To support split core on POWER8 we need to modify various parts of the
KVM code to use threads_per_subcore instead of threads_per_core. On
systems that do not support split core threads_per_subcore ==
threads_per_core and these changes are a nop.

We use threads_per_subcore as the value reported by KVM_CAP_PPC_SMT.
This communicates to userspace that guests can only be created with
a value of threads_per_core that is less than or equal to the current
threads_per_subcore. This ensures that guests can only be created with a
thread configuration that we are able to run given the current split
core mode.

Although threads_per_subcore can change during the life of the system,
the commit that enables that will ensure that threads_per_subcore does
not change during the life of a KVM VM.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Acked-by: Alexander Graf <agraf@suse.de>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:37 +10:00
Michael Ellerman
6f5e40a300 powerpc: Check cpu_thread_in_subcore() in __cpu_up()
To support split core we need to change the check in __cpu_up() that
determines if a cpu is allowed to come online.

Currently we refuse to online cpus which are not the primary thread
within their core.

On POWER8 with split core support this check needs to instead refuse to
online cpus which are not the primary thread within their *sub* core.

On POWER7 and other systems that do not support split core,
threads_per_subcore == threads_per_core and so the check is equivalent.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:36 +10:00
Michael Ellerman
5853aef1ac powerpc: Add threads_per_subcore
On POWER8 we have a new concept of a subcore. This is what happens when
you take a regular core and split it. A subcore is a grouping of two or
four SMT threads, as well as a handfull of SPRs which allows the subcore
to appear as if it were a core from the point of view of a guest.

Unlike threads_per_core which is fixed at boot, threads_per_subcore can
change while the system is running. Most code will not want to use
threads_per_subcore.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:35 +10:00
Michael Ellerman
8d6f7c5aa3 powerpc/powernv: Make it possible to skip the IRQHAPPENED check in power7_nap()
To support split core we need to be able to force all secondaries into
nap, so the core can detect they are idle and do an unsplit.

Currently power7_nap() will return without napping if there is an irq
pending. We want to ignore the pending irq and nap anyway, we will deal
with the interrupt later.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:35 +10:00
Michael Ellerman
441c19c8a2 powerpc/kvm/book3s_hv: Rework the secondary inhibit code
As part of the support for split core on POWER8, we want to be able to
block splitting of the core while KVM VMs are active.

The logic to do that would be exactly the same as the code we currently
have for inhibiting onlining of secondaries.

Instead of adding an identical mechanism to block split core, rework the
secondary inhibit code to be a "HV KVM is active" check. We can then use
that in both the cpu hotplug code and the upcoming split core code.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Acked-by: Alexander Graf <agraf@suse.de>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:34 +10:00
Nishanth Aravamudan
64bb80d87f powerpc/numa: Enable CONFIG_HAVE_MEMORYLESS_NODES
Based off fd1197f1 for ia64, enable CONFIG_HAVE_MEMORYLESS_NODES if
NUMA. Initialize the local memory node in start_secondary.

With this commit and the preceding to enable
CONFIG_USER_PERCPU_NUMA_NODE_ID, which is a prerequisite, in a PowerKVM
guest with the following topology:

numactl --hardware
available: 3 nodes (0-2)
node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94
95 96 97 98 99
node 0 size: 1998 MB
node 0 free: 521 MB
node 1 cpus: 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114
115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132
133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150
151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186
187 188 189 190 191 192 193 194 195 196 197 198 199
node 1 size: 0 MB
node 1 free: 0 MB
node 2 cpus:
node 2 size: 2039 MB
node 2 free: 1739 MB
node distances:
node   0   1   2
  0:  10  40  40
  1:  40  10  40
  2:  40  40  10

the unreclaimable slab is reduced by close to 130M:

Before:
        Slab:             418176 kB
        SReclaimable:      26624 kB
        SUnreclaim:       391552 kB

After:
        Slab:             298944 kB
        SReclaimable:      31744 kB
        SUnreclaim:       267200 kB

Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:34 +10:00
Nishanth Aravamudan
8c27226119 powerpc/numa: Enable USE_PERCPU_NUMA_NODE_ID
Based off 3bccd996 for ia64, convert powerpc to use the generic per-CPU
topology tracking, specifically:

    initialize per cpu numa_node entry in start_secondary
    remove the powerpc cpu_to_node()
    define CONFIG_USE_PERCPU_NUMA_NODE_ID if NUMA

Signed-off-by: Nishanth Aravamudan <nacc@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:35:33 +10:00
Benjamin Herrenschmidt
86969cf733 Merge branch 'merge' into next
Merge the binutils and kexec fixes.
2014-05-28 13:30:12 +10:00
Srivatsa S. Bhat
011e4b02f1 powerpc, kexec: Fix "Processor X is stuck" issue during kexec from ST mode
If we try to perform a kexec when the machine is in ST (Single-Threaded) mode
(ppc64_cpu --smt=off), the kexec operation doesn't succeed properly, and we
get the following messages during boot:

[    0.089866] POWER8 performance monitor hardware support registered
[    0.089985] power8-pmu: PMAO restore workaround active.
[    5.095419] Processor 1 is stuck.
[   10.097933] Processor 2 is stuck.
[   15.100480] Processor 3 is stuck.
[   20.102982] Processor 4 is stuck.
[   25.105489] Processor 5 is stuck.
[   30.108005] Processor 6 is stuck.
[   35.110518] Processor 7 is stuck.
[   40.113369] Processor 9 is stuck.
[   45.115879] Processor 10 is stuck.
[   50.118389] Processor 11 is stuck.
[   55.120904] Processor 12 is stuck.
[   60.123425] Processor 13 is stuck.
[   65.125970] Processor 14 is stuck.
[   70.128495] Processor 15 is stuck.
[   75.131316] Processor 17 is stuck.

Note that only the sibling threads are stuck, while the primary threads (0, 8,
16 etc) boot just fine. Looking closer at the previous step of kexec, we observe
that kexec tries to wakeup (bring online) the sibling threads of all the cores,
before performing kexec:

[ 9464.131231] Starting new kernel
[ 9464.148507] kexec: Waking offline cpu 1.
[ 9464.148552] kexec: Waking offline cpu 2.
[ 9464.148600] kexec: Waking offline cpu 3.
[ 9464.148636] kexec: Waking offline cpu 4.
[ 9464.148671] kexec: Waking offline cpu 5.
[ 9464.148708] kexec: Waking offline cpu 6.
[ 9464.148743] kexec: Waking offline cpu 7.
[ 9464.148779] kexec: Waking offline cpu 9.
[ 9464.148815] kexec: Waking offline cpu 10.
[ 9464.148851] kexec: Waking offline cpu 11.
[ 9464.148887] kexec: Waking offline cpu 12.
[ 9464.148922] kexec: Waking offline cpu 13.
[ 9464.148958] kexec: Waking offline cpu 14.
[ 9464.148994] kexec: Waking offline cpu 15.
[ 9464.149030] kexec: Waking offline cpu 17.

Instrumenting this piece of code revealed that the cpu_up() operation actually
fails with -EBUSY. Thus, only the primary threads of all the cores are online
during kexec, and hence this is a sure-shot receipe for disaster, as explained
in commit e8e5c2155b (powerpc/kexec: Fix orphaned offline CPUs across kexec),
as well as in the comment above wake_offline_cpus().

It turns out that cpu_up() was returning -EBUSY because the variable
'cpu_hotplug_disabled' was set to 1; and this disabling of CPU hotplug was done
by migrate_to_reboot_cpu() inside kernel_kexec().

Now, migrate_to_reboot_cpu() was originally written with the assumption that
any further code will not need to perform CPU hotplug, since we are anyway in
the reboot path. However, kexec is clearly not such a case, since we depend on
onlining CPUs, atleast on powerpc.

So re-enable cpu-hotplug after returning from migrate_to_reboot_cpu() in the
kexec path, to fix this regression in kexec on powerpc.

Also, wrap the cpu_up() in powerpc kexec code within a WARN_ON(), so that we
can catch such issues more easily in the future.

Fixes: c97102ba96 (kexec: migrate to reboot cpu)
Cc: stable@vger.kernel.org
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:24:26 +10:00
Guenter Roeck
7998eb3dc7 powerpc: Fix 64 bit builds with binutils 2.24
With binutils 2.24, various 64 bit builds fail with relocation errors
such as

arch/powerpc/kernel/built-in.o: In function `exc_debug_crit_book3e':
	(.text+0x165ee): relocation truncated to fit: R_PPC64_ADDR16_HI
	against symbol `interrupt_base_book3e' defined in .text section
	in arch/powerpc/kernel/built-in.o
arch/powerpc/kernel/built-in.o: In function `exc_debug_crit_book3e':
	(.text+0x16602): relocation truncated to fit: R_PPC64_ADDR16_HI
	against symbol `interrupt_end_book3e' defined in .text section
	in arch/powerpc/kernel/built-in.o

The assembler maintainer says:

 I changed the ABI, something that had to be done but unfortunately
 happens to break the booke kernel code.  When building up a 64-bit
 value with lis, ori, shl, oris, ori or similar sequences, you now
 should use @high and @higha in place of @h and @ha.  @h and @ha
 (and their associated relocs R_PPC64_ADDR16_HI and R_PPC64_ADDR16_HA)
 now report overflow if the value is out of 32-bit signed range.
 ie. @h and @ha assume you're building a 32-bit value. This is needed
 to report out-of-range -mcmodel=medium toc pointer offsets in @toc@h
 and @toc@ha expressions, and for consistency I did the same for all
 other @h and @ha relocs.

Replacing @h with @high in one strategic location fixes the relocation
errors. This has to be done conditionally since the assembler either
supports @h or @high but not both.

Cc: <stable@vger.kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-28 13:24:05 +10:00
Benjamin Herrenschmidt
b9d800959e Merge remote-tracking branch 'scott/next' into next
<<
Highlights include a few new boards, a device tree binding for CCF
(including backwards-compatible device tree updates to distinguish
incompatible versions), and some fixes.
>>
2014-05-28 10:02:58 +10:00
Naoki MATSUMOTO
3a0d89d3f8 USB: delete CONFIG_USB_DEVICEFS from defconfig
It no longer occurs in Kconfig.
USB: remove CONFIG_USB_DEVICEFS(fb28d58b) leaked remove defconfig.

Signed-off-by: Naoki MATSUMOTO <nekomatu+linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-05-27 16:07:13 -07:00
Hanjun Guo
a43ae58c84 PCI: Turn pcibios_penalize_isa_irq() into a weak function
pcibios_penalize_isa_irq() is only implemented by x86 now, and legacy ISA
is not used by some architectures.  Make pcibios_penalize_isa_irq() a
__weak function to simplify the code.  This removes the need for new
platforms to add stub implementations of pcibios_penalize_isa_irq().

[bhelgaas: changelog, comments]
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
2014-05-27 16:23:58 -06:00
Yijing Wang
c888770eb2 powerpc/PCI: Use pci_is_bridge() to simplify code
Use pci_is_bridge() to simplify code.  No functional change.

Requires: 326c1cdae7 PCI: Rename pci_is_bridge() to pci_has_subordinate()
Requires: 1c86438c94 PCI: Add new pci_is_bridge() interface
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2014-05-27 14:57:36 -06:00
David S. Miller
54e5c4def0 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts:
	drivers/net/bonding/bond_alb.c
	drivers/net/ethernet/altera/altera_msgdma.c
	drivers/net/ethernet/altera/altera_sgdma.c
	net/ipv6/xfrm6_output.c

Several cases of overlapping changes.

The xfrm6_output.c has a bug fix which overlaps the renaming
of skb->local_df to skb->ignore_df.

In the Altera TSE driver cases, the register access cleanups
in net-next overlapped with bug fixes done in net.

Similarly a bug fix to send ALB packets in the bonding driver using
the right source address overlaps with cleanups in net-next.

Signed-off-by: David S. Miller <davem@davemloft.net>
2014-05-24 00:32:30 -04:00
Grant Likely
ba52464a62 of: Stop naming platform_device using dcr address
There is now a way to ensure all platform devices get a unique name when
populated from the device tree, and the DCR_NATIVE code path is broken
anyway. PowerPC Cell (PS3) is the only platform that actually uses this
path.  Most likely nobody will notice if it is killed. Remove the code
and associated ugly #ifdef.

The user-visible impact of this patch is that any DCR device on Cell
will get a new name in the /sys/devices hierarchy.

Signed-off-by: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-23 08:28:02 +09:00
Scott Wood
e83eb028bb powerpc/fsl: Add fsl,portid-mapping to corenet1-cf chips
Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Diana Craciun <diana.craciun@freescale.com>
2014-05-22 18:10:42 -05:00
Alexander Graf
8cb59788b3 PPC: ePAPR: Fix hypercall on LE guest
We get an array of instructions from the hypervisor via device tree that
we write into a buffer that gets executed whenever we want to make an
ePAPR compliant hypercall.

However, the hypervisor passes us these instructions in BE order which
we have to manually convert to LE when we want to run them in LE mode.

With this fixup in place, I can successfully run LE kernels with KVM
PV enabled on PR KVM.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:33 -05:00
harninder rai
1be62c6cce powerpc/mpc85xx: Add BSC9132 QDS Support
- BSC9132 is an integrated device that targets Femto base station market.
  It combines Power Architecture e500v2 and DSP StarCore SC3850 technologies
  with MAPLE-B2F baseband acceleration processing elements

- BSC9132QDS Overview
     2Gbyte DDR3 (on board DDR)
     32Mbyte 16bit NOR flash
     128Mbyte 2K page size NAND Flash
     256 Kbit M24256 I2C EEPROM
     128 Mbit SPI Flash memory
     SD slot
     eTSEC1: Connected to SGMII PHY
     eTSEC2: Connected to SGMII PHY
     DUART interface: supports one UARTs up to 115200 bps for console display

Signed-off-by: Harninder Rai <harninder.rai@freescale.com>
Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:32 -05:00
Lijun Pan
fd7e5b7a87 powerpc/mpc85xx: Remove P1023 RDS support
P1023RDS is no longer supported/manufactured by Freescale while P1023RDB is.

Signed-off-by: Lijun Pan <Lijun.Pan@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:31 -05:00
Scott Wood
aa80581da1 powerpc/mpic: Don't init the fsl error int until after mpic init
Besides other potential problems, if MPIC_NO_RESET is  not set,
the error interrupt will be masked after it is requested.

Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:30 -05:00
Prabhakar Kushwaha
0c0fc4d3a9 powerpc/fsl-booke: Add initial T104x_QDS board support
Add support for T104x board in board file t104x_qds.c, It is common for
 both T1040 and T1042 as they share same QDS board.

 T1040QDS board Overview
 -----------------------
 - SERDES Connections, 8 lanes supporting:
      — PCI Express: supporting Gen 1 and Gen 2;
      — SGMII
      — QSGMII
      — SATA 2.0
      — Aurora debug with dedicated connectors (T1040 only)
 - DDR Controller
     - Supports rates of up to 1600 MHz data-rate
     - Supports one DDR3LP UDIMM/RDIMMs, of single-, dual- or quad-rank types.
 -IFC/Local Bus
     - NAND flash: 8-bit, async, up to 2GB.
     - NOR: 8-bit or 16-bit, non-multiplexed, up to 512MB
     - GASIC: Simple (minimal) target within Qixis FPGA
     - PromJET rapid memory download support
 - Ethernet
     - Two on-board RGMII 10/100/1G ethernet ports.
     - PHY #0 remains powered up during deep-sleep (T1040 only)
 - QIXIS System Logic FPGA
 - Clocks
     - System and DDR clock (SYSCLK, “DDRCLK”)
     - SERDES clocks
 - Power Supplies
 - Video
     - DIU supports video at up to 1280x1024x32bpp
 - USB
     - Supports two USB 2.0 ports with integrated PHYs
     — Two type A ports with 5V@1.5A per port.
     — Second port can be converted to OTG mini-AB
 - SDHC
     - SDHC port connects directly to an adapter card slot, featuring:
     - Supporting SD slots for: SD, SDHC (1x, 4x, 8x) and/or MMC
     — Supporting eMMC memory devices
 - SPI
    -  On-board support of 3 different devices and sizes
 - Other IO
    - Two Serial ports
    - ProfiBus port
    - Four I2C ports

Add T104xQDS support in Kconfig and Makefile. Also create device tree.
Following features are currently not implmented.
  - SerDes: Aurora
  - IFC: GASIC, Promjet
  - QIXIS
  - Ethernet
  - DIU
  - power supplies management
  - ProfiBus

Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:29 -05:00
Prabhakar Kushwaha
fb734eeebf powerpc/mpc85xx:Add initial device tree support of T104x
The QorIQ T1040/T1042 processor support four integrated 64-bit e5500 PA
processor cores with high-performance data path acceleration architecture
and network peripheral interfaces required for networking & telecommunications.

T1042 personality is a reduced personality of T1040 without Integrated 8-port
Gigabit Ethernet switch.

The T1040/T1042 SoC includes the following function and features:

 - Four e5500 cores, each with a private 256 KB L2 cache
 - 256 KB shared L3 CoreNet platform cache (CPC)
 - Interconnect CoreNet platform
 - 32-/64-bit DDR3L/DDR4 SDRAM memory controller with ECC and interleaving
   support
 - Data Path Acceleration Architecture (DPAA) incorporating acceleration
 for the following functions:
    -  Packet parsing, classification, and distribution
    -  Queue management for scheduling, packet sequencing, and congestion
    	management
    -  Cryptography Acceleration (SEC 5.0)
    - RegEx Pattern Matching Acceleration (PME 2.2)
    - IEEE Std 1588 support
    - Hardware buffer management for buffer allocation and deallocation
 - Ethernet interfaces
    - Integrated 8-port Gigabit Ethernet switch (T1040 only)
    - Four 1 Gbps Ethernet controllers
 - Two RGMII interfaces or one RGMII and one MII interfaces
 - High speed peripheral interfaces
   - Four PCI Express 2.0 controllers running at up to 5 GHz
   - Two SATA controllers supporting 1.5 and 3.0 Gb/s operation
   - Upto two QSGMII interface
   - Upto six SGMII interface supporting 1000 Mbps
   - One SGMII interface supporting upto 2500 Mbps
 - Additional peripheral interfaces
   - Two USB 2.0 controllers with integrated PHY
   - SD/eSDHC/eMMC
   -  eSPI controller
   - Four I2C controllers
   - Four UARTs
   - Four GPIO controllers
   - Integrated flash controller (IFC)
   - Change this to  LCD/ HDMI interface (DIU) with 12 bit dual data rate
   - TDM interface
 - Multicore programmable interrupt controller (PIC)
 - Two 8-channel DMA engines
 - Single source clocking implementation
 - Deep Sleep power implementaion (wakeup from GPIO/Timer/Ethernet/USB)

Signed-off-by: Poonam Aggrwal <poonam.aggrwal@freescale.com>
Signed-off-by: Priyanka Jain <Priyanka.Jain@freescale.com>
Signed-off-by: Varun Sethi <Varun.Sethi@freescale.com>
Signed-off-by: Prabhakar Kushwaha <prabhakar@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:29 -05:00
Diana Craciun
846c944357 powerpc/fsl: Updated corenet-cf compatible string for corenet1-cf chips
Updated the device trees according to the corenet-cf
binding definition.

Signed-off-by: Diana Craciun <Diana.Craciun@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:28 -05:00
Diana Craciun
f2e7bfbb04 powerpc/fsl: Updated device trees for platforms with corenet version 2
Updated the device trees according to the corenet-cf
binding definition.

Signed-off-by: Diana Craciun <Diana.Craciun@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:26 -05:00
Scott Wood
8067bd8a12 powerpc: Fix unused variable warning for epapr_has_idle
This warning can be seen in allyesconfig, and was introduced by commit
f9eb581c63b2acce827570e105205c0789360650 "powerpc: fix build of
epapr_paravirt on 64-bit book3s".

Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:24 -05:00
Scott Wood
440d74d1ca powerpc: fix build of epapr_paravirt on 64-bit book3s
This fixes an allyesconfig build break introduced by commit
7762b1ed7aaee223230793fcee80672e2e3aa7a8 "powerpc: move epapr paravirt
init of power_save to an initcall".

Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Stuart Yoder <stuart.yoder@freescale.com>
2014-05-22 18:08:23 -05:00
Stuart Yoder
83e267d797 powerpc: move epapr paravirt init of power_save to an initcall
some restructuring of epapr paravirt init resulted in
ppc_md.power_save being set, and then overwritten to
NULL during machine_init.  This patch splits the
initialization of ppc_md.power_save out into a postcore
init call.

Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:21 -05:00
Martijn de Gouw
2b09c60389 powerpc/85xx: Add OCA4080 board support
OCA4080 overview:
- 1.466 GHz Freescale QorIQ P4080E Processor
- 4Gbyte DDR3 on board
- 8Mbyte Nor flash
- Serial RapidIO 1.2
- 1 x 10/100/1000 BASE-T front ethernet
- 1 x 1000 BASE-BX ethernet on AMC connector

Signed-off-by: Martijn de Gouw <martijn.de.gouw@prodrive.nl>
[scottwood@freescale.com: minor conflict-related changes]
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:20 -05:00
Valentin Longchamp
497c8b6096 powerpc/mpc85xx: add support for Keymile's kmcoge4 board
This patch introduces the support for Keymile's kmcoge4 board which is
the internal reference design for boards based on Freescale's
P2040/P2041 SoCs. This internal reference design is named kmp204x.

The peripherals used on this board are:
- SPI NOR Flash as bootloader medium
- NAND Flash with a ubi partition
- 2 PCIe busses (hosts 1 and 3)
- 3 FMAN Ethernet devices (FMAN1 DTSEC1/2/5)
- 4 Local Bus windows, with one dedicated to the QRIO reset/power mgmt
  CPLD
- 2 I2C busses
- last but not least, the mandatory serial port

The patch also adds a defconfig file for this reference design that is
necessary because of the lowmem option that must be set higher due to
the number of PCIe devices with big ioremapped mem ranges on the boad.

Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:18 -05:00
Wang Dongsheng
dd41d51436 fsl/pci: fix RC cannot detect PME message coming
PCI controller disable PME message report feature, that shouldn't
have happened. Fix it and enable PME message report feature.

Signed-off-by: Wang Dongsheng <dongsheng.wang@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:14 -05:00
Liu Gang
1c075f9550 powerpc/rmu: Fix the error memory free parameters
There are error parameters should be corrected when
calling dma_free_coherent to free rmu rx-ring buffers
in fsl_open_inb_mbox() function.

Signed-off-by: Liu Gang <Gang.Liu@freescale.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:13 -05:00
Scott Wood
e57eeae4e6 powerpc/fsl-booke64: Set vmemmap_psize to 4K
The only way Freescale booke chips support mappings larger than 4K
is via TLB1.  The only way we support (direct) TLB1 entries is via
hugetlb, which is not what map_kernel_page() does when given a large
page size.

Without this, a kernel with CONFIG_SPARSEMEM_VMEMMAP enabled crashes on
boot with messages such as:

PID hash table entries: 4096 (order: 3, 32768 bytes)
Sorting __ex_table...
BUG: Bad page state in process swapper  pfn:00a2f
page:8000040000023a48 count:0 mapcount:0 mapping:0000040000ffce48 index:0x40000ffbe50
page flags: 0x40000ffda40(active|arch_1|private|private_2|head|tail|swapcache|mappedtodisk|reclaim|swapbacked|unevictable|mlocked)
page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set
bad because of flags:
page flags: 0x311840(active|private|private_2|swapcache|unevictable|mlocked)
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 3.15.0-rc1-00003-g7fa250c #299
Call Trace:
[c00000000098ba20] [c000000000008b3c] .show_stack+0x7c/0x1cc (unreliable)
[c00000000098baf0] [c00000000060aa50] .dump_stack+0x88/0xb4
[c00000000098bb70] [c0000000000c0468] .bad_page+0x144/0x1a0
[c00000000098bc10] [c0000000000c0628] .free_pages_prepare+0x164/0x17c
[c00000000098bcc0] [c0000000000c24cc] .free_hot_cold_page+0x48/0x214
[c00000000098bd60] [c00000000086c318] .free_all_bootmem+0x1fc/0x354
[c00000000098be70] [c00000000085da84] .mem_init+0xac/0xdc
[c00000000098bef0] [c0000000008547b0] .start_kernel+0x21c/0x4d4
[c00000000098bf90] [c000000000000448] .start_here_common+0x20/0x58

Signed-off-by: Scott Wood <scottwood@freescale.com>
2014-05-22 18:08:12 -05:00
Florian Fainelli
1f8c486fac powerpc/fsl: fsl_soc: remove 'fixed-link' parsing code
Parsing and registration of fixed PHY devices was needed with the use of
of_phy_connect_fixed_link() because this function was using the
designated PHY address identifier (first cell of the property) as the
address to bind the PHY on the emulated bus.

Since commit 3be2a49e5c ("of: provide a
binding for fixed link PHYs") a new pair of functions has been
introduced which allows for dynamic address allocation of these fixed
PHY devices, but also parses the old 'fixed-link' 5-digit property.

Registration of fixed PHY early in platform code was needed because we
could not issue a fixed MDIO bus re-scan within network drivers. The
fixed PHYs had to be registered before the network drivers would call
of_phy_connect_fixed_link(). All of these caveats are solved now, such
that we can safely remove of_add_fixed_phys() now.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-05-22 15:16:44 -04:00
Ingo Molnar
65c2ce7004 Linux 3.15-rc6
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Merge tag 'v3.15-rc6' into sched/core, to pick up the latest fixes

Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-05-22 10:28:56 +02:00
Rusty Russell
872aa779bc powerpc/module: Fix stubs for BE
A simple patch which was supposed to swap r12 and r11 also
inexplicably changed the offset by two bytes.  This instruction
(to load r2) isn't used in LE, so it wasn't noticed.

Fixes: b1ce369e82 ("powerpc: modules: use r12 for stub jump address.)
Reported-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Tested-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-20 10:56:01 +10:00
Jeff Bailey
1efc563865 powerpc: Clear ELF personality flag if ELFv2 is not requested.
powerpc: Clear ELF personality flag if ELFv2 is not requested.

The POWER kernel uses a personality flag to determine whether it should
be setting up function descriptors or not (per the updated ABI).  This
flag wasn't being cleared on a new process but instead was being
inherited.  The visible effect was that an ELFv2 binary could not execve
to an ELFv1 binary.

Signed-off-by: Jeff Bailey <jeffbailey@google.com>

 arch/powerpc/include/asm/elf.h | 2 ++
 1 file changed, 2 insertions(+)
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-20 10:55:59 +10:00
Paul Gortmaker
21f585073d powerpc: Fix smp_processor_id() in preemptible splat in set_breakpoint
Currently, on 8641D, which doesn't set CONFIG_HAVE_HW_BREAKPOINT
we get the following splat:

BUG: using smp_processor_id() in preemptible [00000000] code: login/1382
caller is set_breakpoint+0x1c/0xa0
CPU: 0 PID: 1382 Comm: login Not tainted 3.15.0-rc3-00041-g2aafe1a4d451 #1
Call Trace:
[decd5d80] [c0008dc4] show_stack+0x50/0x158 (unreliable)
[decd5dc0] [c03c6fa0] dump_stack+0x7c/0xdc
[decd5de0] [c01f8818] check_preemption_disabled+0xf4/0x104
[decd5e00] [c00086b8] set_breakpoint+0x1c/0xa0
[decd5e10] [c00d4530] flush_old_exec+0x2bc/0x588
[decd5e40] [c011c468] load_elf_binary+0x2ac/0x1164
[decd5ec0] [c00d35f8] search_binary_handler+0xc4/0x1f8
[decd5ef0] [c00d4ee8] do_execve+0x3d8/0x4b8
[decd5f40] [c001185c] ret_from_syscall+0x0/0x38
 --- Exception: c01 at 0xfeee554
    LR = 0xfeee7d4

The call path in this case is:

	flush_thread
	   --> set_debug_reg_defaults
	     --> set_breakpoint
	       --> __get_cpu_var

Since preemption is enabled in the cleanup of flush thread, and
there is no need to disable it, introduce the distinction between
set_breakpoint and __set_breakpoint, leaving only the flush_thread
instance as the current user of set_breakpoint.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-20 10:54:06 +10:00
Paul Gortmaker
04c32a5168 powerpc: Drop return value from set_breakpoint as it is unused
None of the callers check the return value, so it might as
well not have one at all.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-20 10:54:05 +10:00
James Hogan
dade934a5e powerpc: Remove non-uapi linkage.h export
The arch/powerpc/include/asm/linkage.h is being unintentionally exported
in the kernel headers since commit e1b5bb6d12 (consolidate
cond_syscall and SYSCALL_ALIAS declarations) when
arch/powerpc/include/uapi/asm/linkage.h was deleted but the header-y not
removed from the Kbuild file. This happens because Makefile.headersinst
still checks the old asm/ directory if the specified header doesn't
exist in the uapi directory.

The asm/linkage.h shouldn't ever have been exported anyway. No other
arch does and it doesn't contain anything useful to userland, so remove
the header-y line from the Kbuild file which triggers the export.

Signed-off-by: James Hogan <james.hogan@imgtec.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-20 10:54:05 +10:00
Gavin Shan
1e54b9383c powerpc/eeh: Fix build error for celleb
Commit 7f52a526f ("powerpc/eeh: Allow to disable EEH") caused
following build error with "celleb_defconfig" as being catched
by Mikey on linux-next.

arch/powerpc/kernel/eeh.c: In function 'eeh_init_proc':
arch/powerpc/kernel/eeh.c:1173:37: error: 'powerpc_debugfs_root' \
undeclared (first use in this function)
arch/powerpc/kernel/eeh.c:1173:37: note: each undeclared identifier \
is reported only once for each function it appears in

Reported-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-20 10:54:04 +10:00
Benjamin Herrenschmidt
c534bbe563 Merge branch 'merge' into next
Merge "merge" branch to get two fairly important bug fixes:

powerpc/powernv: Reset root port in firmware
powerpc: irq work racing with timer interrupt can result in timer interrupt
2014-05-20 10:21:48 +10:00
Benjamin Herrenschmidt
965b5608f7 Revert "powerpc/powernv: Fundamental reset on PLX ports"
This reverts commit b2b5efcf20.

This code was way too board specific, there are quirks as to how
the PERST line is wired on different boards, we'll have to revisit
this using/creating appropriate firmware interfaces.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-20 10:20:49 +10:00
Rob Herring
eafd370dfe Merge branch 'dt-bus-name' into for-next 2014-05-13 18:34:35 -05:00
Paolo Bonzini
5367742ad5 Patch queue for 3.15 - 2014-05-12
This request includes a few bug fixes that really shouldn't wait for the next
 release.
 
 It fixes KVM on 32bit PowerPC when built as module. It also fixes the PV KVM
 acceleration when NX gets honored by the host. Furthermore we fix transactional
 memory support and numa support on HV KVM.
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Merge tag 'signed-for-3.15' of git://github.com/agraf/linux-2.6 into kvm-master

Patch queue for 3.15 - 2014-05-12

This request includes a few bug fixes that really shouldn't wait for the next
release.

It fixes KVM on 32bit PowerPC when built as module. It also fixes the PV KVM
acceleration when NX gets honored by the host. Furthermore we fix transactional
memory support and numa support on HV KVM.
2014-05-13 18:15:16 +02:00
Anton Blanchard
8050936caf powerpc: irq work racing with timer interrupt can result in timer interrupt hang
I am seeing an issue where a CPU running perf eventually hangs.
Traces show timer interrupts happening every 4 seconds even
when a userspace task is running on the CPU. /proc/timer_list
also shows pending hrtimers have not run in over an hour,
including the scheduler.

Looking closer, decrementers_next_tb is getting set to
0xffffffffffffffff, and at that point we will never take
a timer interrupt again.

In __timer_interrupt() we set decrementers_next_tb to
0xffffffffffffffff and rely on ->event_handler to update it:

        *next_tb = ~(u64)0;
        if (evt->event_handler)
                evt->event_handler(evt);

In this case ->event_handler is hrtimer_interrupt. This will eventually
call back through the clockevents code with the next event to be
programmed:

static int decrementer_set_next_event(unsigned long evt,
                                      struct clock_event_device *dev)
{
        /* Don't adjust the decrementer if some irq work is pending */
        if (test_irq_work_pending())
                return 0;
        __get_cpu_var(decrementers_next_tb) = get_tb_or_rtc() + evt;

If irq work came in between these two points, we will return
before updating decrementers_next_tb and we never process a timer
interrupt again.

This looks to have been introduced by 0215f7d8c5 (powerpc: Fix races
with irq_work). Fix it by removing the early exit and relying on
code later on in the function to force an early decrementer:

       /* We may have raced with new irq work */
       if (test_irq_work_pending())
               set_dec(1);

Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-12 14:29:28 +10:00
Gavin Shan
372cf1244d powerpc/powernv: Reset root port in firmware
Resetting root port has more stuff to do than that for PCIe switch
ports and we should have resetting root port done in firmware instead
of the kernel itself. The problem was introduced by commit 5b2e198e
("powerpc/powernv: Rework EEH reset").

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-12 10:33:08 +10:00
Scott Wood
a614db9ae9 powerpc/fsl-rio: Fix fsl_rio_setup error paths and use-after-unmap
Several of the error paths from fsl_rio_setup are missing error
messages.

Worse, fsl_rio_setup initializes several global pointers and does not
NULL them out after freeing/unmapping on error.  This caused
fsl_rio_mcheck_exception() to crash when accessing rio_regs_win which
was non-NULL but had been unmapped.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Cc: Liu Gang <Gang.Liu@freescale.com>
---
Liu Gang, are you sure all of these error conditions are fatal?  Why
does the rio driver fail if rmu is not present (e.g.  on t4240)?
2014-05-09 15:49:05 -05:00
Vincent Guittot
607b45e9a2 sched, powerpc: Create a dedicated topology table
Create a dedicated topology table for handling asymetric feature of powerpc.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Andy Fleming <afleming@freescale.com>
Cc: Anton Blanchard <anton@samba.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Preeti U. Murthy <preeti@linux.vnet.ibm.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Toshi Kani <toshi.kani@hp.com>
Cc: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: schwidefsky@de.ibm.com
Cc: cmetcalf@tilera.com
Cc: dietmar.eggemann@arm.com
Cc: devicetree@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1397209481-28542-4-git-send-email-vincent.guittot@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-05-07 13:33:51 +02:00
Benjamin Herrenschmidt
f6869e7fe6 Merge remote-tracking branch 'anton/abiv2' into next
This series adds support for building the powerpc 64-bit
LE kernel using the new ABI v2. We already supported
running ABI v2 userspace programs but this adds support
for building the kernel itself using the new ABI.
2014-05-05 20:57:12 +10:00
Alexander Popov
62057d3375 dma: mpc512x: separate 'compatible' values for MPC512x and MPC8308
MPC512x and MPC8308 have similar DMA controllers, but are independent SoCs.
DMA controller driver should have separate 'compatible' values for these SoCs.

Signed-off-by: Alexander Popov <a13xp0p0v88@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
2014-05-02 22:36:21 +05:30
Liu Ping Fan
5a4e58bc69 powerpc/mm: use macro PGTABLE_EADDR_SIZE instead of digital
In case of extending the eaddr in future, use this macro
PGTABLE_EADDR_SIZE to ease the maintenance of the code.

Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-01 08:26:39 +10:00
Alistair Popple
d5b35cffe3 ppc476: Enable a linker work around for IBM errata #46
This patch adds an option to enable a work around for an icache bug on
476 that can cause execution of stale instructions when falling
through pages (IBM errata #46). It requires a recent version of
binutils which supports the --ppc476-workaround option.

The work around enables the appropriate linker options and ensures
that all module output sections are aligned to 4K page boundaries. The
work around is only required when building modules.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-01 08:26:34 +10:00
Alistair Popple
e2c37d9083 powerpc: Added PCI MSI support using the HSTA module
The PPC476GTR SoC supports message signalled interrupts (MSI) by writing
to special addresses within the High Speed Transfer Assist (HSTA) module.

This patch adds support for PCI MSI with a new system device. The DMA
window is also updated to allow access to the entire 42-bit address range
to allow PCI devices write access to the HSTA module.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-01 08:26:30 +10:00
Alistair Popple
2a2c74b2ef IBM Akebono: Add the Akebono platform
This patch adds support for the IBM Akebono board.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-01 08:26:26 +10:00
Alistair Popple
6b11930f72 IBM Currituck: Clean up board specific code before adding Akebono code
The IBM Akebono code uses the same initialisation functions as the
earlier Currituck board. Rather than create a copy of this code for
Akebono we will instead integrate support for it into the same file as
the Currituck code.

This patch just renames the board support file and updates the Makefile.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-01 08:26:22 +10:00
Tony Breeds
983d8a6dda powerpc/le: Show the endianess of the LPAR under PowerVM.
Signed-off-by: Tony Breeds <tony@bakeyournoodle.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-05-01 08:26:18 +10:00
Alexander Graf
9048e648bc powerpc: Use 64k io pages when we never see an HEA
When we never get around to seeing an HEA ethernet adapter, there's
no point in restricting ourselves to 4k IO page size.

This speeds up IO maps when CONFIG_IBMEBUS is disabled.

[ Updated the test to also lift the restriction on arch 2.07
  (Power 8) which cannot have an HEA
 -- BenH ]

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

foo
2014-05-01 08:25:16 +10:00
Sebastian Ott
dfc73e7acd PCI: Move Open Firmware devspec attribute to PCI common code
Move the devspec OF attribute to PCI common code's set of device attributes
since it's not architecture dependent.  As a side effect microblaze and
powerpc no longer need to use pcibios_add_platform_entries().

[bhelgaas: fold in #include for compile error]
Link: https://lkml.kernel.org/r/alpine.LFD.2.11.1404141101500.1529@denkbrett
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-30 14:48:41 -06:00
Rob Herring
c3fc952d2f of: push struct boot_param_header and defines into powerpc
Now powerpc is the only user of struct boot_param_header and FDT defines,
so they can be moved into the powerpc architecture code.

Signed-off-by: Rob Herring <robh@kernel.org>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Tested-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Stephen Chivers <schivers@csc.com>
2014-04-30 00:59:20 -05:00
Rob Herring
060f78c254 powerpc: use libfdt accessors for header data
With libfdt support, we can take advantage of helper accessors in libfdt
for accessing the FDT header data. This makes the code more readable and
makes the FDT blob structure more opaque to the kernel. This also
prepares for removing struct boot_param_header completely.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Tested-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Stephen Chivers <schivers@csc.com>
2014-04-30 00:59:18 -05:00
Rob Herring
d1552ce449 of/fdt: move memreserve and dtb memory reservations into core
Move the /memreserve/ processing and dtb memory reservations into
early_init_fdt_scan_reserved_mem. This converts arm, arm64, and powerpc
as they are the only users of early_init_fdt_scan_reserved_mem.

memblock_reserve is safe to call on the same region twice, so the
reservation check for the dtb in powerpc 32-bit reservations is safe to
remove.

Signed-off-by: Rob Herring <robh@kernel.org>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Cc: Russell King <linux@arm.linux.org.uk>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Tested-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Stephen Chivers <schivers@csc.com>
2014-04-30 00:59:17 -05:00
Rob Herring
b0a6fb36a4 of/fdt: create common debugfs
Both powerpc and microblaze have the same FDT blob in debugfs feature.
Move this to common location and remove the powerpc and microblaze
implementations. This feature could become more useful when FDT
overlay support is added.

This changes the path of the blob from "$arch/flat-device-tree" to
"device-tree/flat-device-tree".

Signed-off-by: Rob Herring <robh@kernel.org>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Tested-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Stephen Chivers <schivers@csc.com>
2014-04-30 00:59:16 -05:00
Rob Herring
9d0c4dfedd of/fdt: update of_get_flat_dt_prop in prep for libfdt
Make of_get_flat_dt_prop arguments compatible with libfdt fdt_getprop
call in preparation to convert FDT code to use libfdt. Make the return
value const and the property length ptr type an int.

Signed-off-by: Rob Herring <robh@kernel.org>
Tested-by: Michal Simek <michal.simek@xilinx.com>
Tested-by: Grant Likely <grant.likely@linaro.org>
Tested-by: Stephen Chivers <schivers@csc.com>
2014-04-30 00:59:15 -05:00
Rob Herring
edba274cde powerpc: fix skipping call to early_init_fdt_scan_reserved_mem
The call to early_init_fdt_scan_reserved_mem will be skipped if
reserved-ranges is not found. Move the call earlier so that it is called
unconditionally.

Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@lists.ozlabs.org
Tested-by: Stephen Chivers <schivers@csc.com>
2014-04-30 00:59:04 -05:00
Philippe Bergheaud
00f554fade powerpc: memcpy optimization for 64bit LE
Unaligned stores take alignment exceptions on POWER7 running in little-endian.
This is a dumb little-endian base memcpy that prevents unaligned stores.
Once booted the feature fixup code switches over to the VMX copy loops
(which are already endian safe).

The question is what we do before that switch over. The base 64bit
memcpy takes alignment exceptions on POWER7 so we can't use it as is.
Fixing the causes of alignment exception would slow it down, because
we'd need to ensure all loads and stores are aligned either through
rotate tricks or bytewise loads and stores. Either would be bad for
all other 64bit platforms.

[ I simplified the loop a bit - Anton ]

Signed-off-by: Philippe Bergheaud <felix@linux.vnet.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-30 15:26:18 +10:00
Alexander Graf
b18db0b808 KVM guest: Make pv trampoline code executable
Our PV guest patching code assembles chunks of instructions on the fly when it
encounters more complicated instructions to hijack. These instructions need
to live in a section that we don't mark as non-executable, as otherwise we
fault when jumping there.

Right now we put it into the .bss section where it automatically gets marked
as non-executable. Add a check to the NX setting function to ensure that we
leave these particular pages executable.

Signed-off-by: Alexander Graf <agraf@suse.de>
2014-04-29 12:36:09 +02:00
Alexander Graf
ab78475c76 KVM: PPC: Book3S: ifdef on CONFIG_KVM_BOOK3S_32_HANDLER for 32bit
The book3s_32 target can get built as module which means we don't see the
config define for it in code. Instead, check on the bool define
CONFIG_KVM_BOOK3S_32_HANDLER whenever we want to know whether we're building
for a book3s_32 host.

This fixes running book3s_32 kvm as a module for me.

Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
2014-04-28 12:35:42 +02:00
Paul Mackerras
0a8eccefcb KVM: PPC: Book3S HV: Add missing code for transaction reclaim on guest exit
Testing by Michael Neuling revealed that commit e4e3812150 ("KVM:
PPC: Book3S HV: Add transactional memory support") is missing the code
that saves away the checkpointed state of the guest when switching to
the host.  This adds that code, which was in earlier versions of the
patch but went missing somehow.

Reported-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
2014-04-28 12:35:41 +02:00
pingfank@linux.vnet.ibm.com
1ad9f23873 KVM: PPC: Book3S: HV: make _PAGE_NUMA take effect
Numa fault is a method which help to achieve auto numa balancing.
When such a page fault takes place, the page fault handler will check
whether the page is placed correctly. If not, migration should be
involved to cut down the distance between the cpu and pages.

A pte with _PAGE_NUMA help to implement numa fault. It means not to
allow the MMU to access the page directly. So a page fault is triggered
and numa fault handler gets the opportunity to run checker.

As for the access of MMU, we need special handling for the powernv's guest.
When we mark a pte with _PAGE_NUMA, we already call mmu_notifier to
invalidate it in guest's htab, but when we tried to re-insert them,
we firstly try to map it in real-mode. Only after this fails, we fallback
to virt mode, and most of important, we run numa fault handler in virt
mode.  This patch guards the way of real-mode to ensure that if a pte is
marked with _PAGE_NUMA, it will NOT be mapped in real mode, instead, it will
be mapped in virt mode and have the opportunity to be checked with placement.

Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
2014-04-28 12:35:41 +02:00
Michael Neuling
7f06f21d40 powerpc/tm: Add checking to treclaim/trechkpt
If we do a treclaim and we are not in TM suspend mode, it results in a TM bad
thing (ie. a 0x700 program check).  Similarly if we do a trechkpt and we have
an active transaction or TEXASR Failure Summary (FS) is not set, we also take a
TM bad thing.

This should never happen, but if it does (ie. a kernel bug), the cause is
almost impossible to debug as the GPR state is mostly userspace and hence we
don't get a call chain.

This adds some checks in these cases case a BUG_ON() (in asm) in case we ever
hit these cases.  It moves the register saving around to preserve r1 till later
also.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:51 +10:00
Michael Neuling
ce0ac1fc32 powerpc/tm: Remove unnecessary r1 save
We save r1 to the scratch SPR and restore it from there after the trechkpt so
saving r1 to the paca is not needed.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:47 +10:00
Gautham R. Shenoy
fb5153d05a powerpc: powernv: Implement ppc_md.get_proc_freq()
Implement a method named pnv_get_proc_freq(unsigned int cpu) which
returns the current clock rate on the 'cpu' in Hz to be reported in
/proc/cpuinfo. This method uses the value reported by cpufreq when
such a value is sane. Otherwise it falls back to old way of reporting
the clockrate, i.e. ppc_proc_freq.

Set the ppc_md.get_proc_freq() hook to pnv_get_proc_freq() on the
PowerNV platform.

Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:43 +10:00
Gautham R. Shenoy
2299d03a63 powerpc: powernv: Framework to show the correct clock in /proc/cpuinfo
Currently, the code in setup-common.c for powerpc assumes that all
clock rates are same in a smp system. This value is cached in the
variable named ppc_proc_freq and is the value that is reported in
/proc/cpuinfo.

However on the PowerNV platform, the clock rate is same only across
the threads of the same core. Hence the value that is reported in
/proc/cpuinfo is incorrect on PowerNV platforms. We need a better way
to query and report the correct value of the processor clock in
/proc/cpuinfo.

The patch achieves this by creating a machdep_call named
get_proc_freq() which is expected to returns the frequency in Hz. The
code in show_cpuinfo() can invoke this method to display the correct
clock rate on platforms that have implemented this method. On the
other powerpc platforms it can use the value cached in ppc_proc_freq.

Signed-off-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:38 +10:00
Vasant Hegde
2196c6f1ed powerpc/powernv: Return secondary CPUs to firmware before FW update
Firmware update on PowerNV platform takes several minutes. During
this time one CPU is stuck in FW and the kernel complains about "soft
lockups".

This patch returns all secondary CPUs to firmware before starting
firmware update process.

[ Reworked a bit and cleaned up -- BenH ]

Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:34 +10:00
Andrew Murray
654837e8fe powerpc/pci: Use of_pci_range_parser helper in pci_process_bridge_OF_ranges
This patch updates the implementation of pci_process_bridge_OF_ranges to use
the of_pci_range_parser helpers.

Signed-off-by: Andrew Murray <amurray@embedded-bits.co.uk>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:29 +10:00
Stephen Chivers
13ae40370f powerpc/legacy_serial: Support MVME5100 UARTS with shifted registers
This patch adds support to legacy serial for
UARTS with shifted registers.

The MVME5100 Single Board Computer is a PowerPC platform
that has 16550 style UARTS with register addresses that are
16 bytes apart (shifted by 4).

Commit 	309257484c
"powerpc: Cleanup udbg_16550 and add support for LPC PIO-only UARTs"
added support to udbg_16550 for shifted registers by adding a "stride"
parameter to the initialisation operations for Programmed IO and
Memory Mapped IO.

As a consequence it is now possible to use the services of legacy serial
to provide early serial console messages for the MVME5100.

An added benefit of this is that the serial console will always be
"ttyS0" irrespective of whether the computer is fitted with extra
PCI 8250 interface boards or not.

I have tested this patch using the four PowerPC platforms available to me:

	MVME5100 - shifted registers,
	SAM440EP - unshifted registers,
	MPC8349 - unshifted registers,
	MVME4100 - unshifted registers.

Signed-off-by: Stephen Chivers <schivers@csc.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:25 +10:00
Cédric Le Goater
147c05168f powerpc/boot: Add support for 64bit little endian wrapper
The code is only slightly modified : entry points now use the
FIXUP_ENDIAN trampoline to switch endian order. The 32bit wrapper
is kept for big endian kernels and 64bit is enforced for little
endian kernels with a PPC64_BOOT_WRAPPER config option.

The linker script is generated using the kernel preprocessor flags
to make use of the CONFIG_* definitions and the wrapper script is
modified to take into account the new elf64ppc format.

Finally, the zImage file is compiled as a position independent
executable (-pie) which makes it loadable at any address by the
firmware.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:21 +10:00
Cédric Le Goater
2d9afb369b powerpc/boot: Add a global entry point for pseries
When entering the boot wrapper in little endian, we will need to fix
the endian order using a fixup trampoline like in the kernel. This
patch overrides the _zimage_start entry point for this purpose.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:17 +10:00
Cédric Le Goater
f16e968499 powerpc/boot: Modify entry point for 64bit
This patch adds support a 64bit wrapper entry point. As in 32bit, the
entry point does its own relocation and can be loaded at any address
by the firmware.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:12 +10:00
Cédric Le Goater
93d3921042 powerpc/boot: Define a routine to enter prom
This patch defines a 'prom' routine similar to 'enter_prom' in the
kernel.

The difference is in the MSR which is built before entering prom. Big
endian order is enforced as in the kernel but 32bit mode is not. It
prepares ground for the next patches which will introduce Little endian
order.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:08 +10:00
Cédric Le Goater
002c39dba3 powerpc/boot: Add little endian support to elf utils
Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:04 +10:00
Cédric Le Goater
284b52c4c6 powerpc/boot: Add 64bit and little endian support to addnote
It could certainly be improved using Elf macros and byteswapping
routines, but the initial version of the code is organised to be a
single file program with limited dependencies. yaboot is the same.

Please scream if you want a total rewrite.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:36:00 +10:00
Cédric Le Goater
98fd433aa6 powerpc/boot: Define byteswapping routines for little endian
These are not the most efficient versions of swab but the wrapper does
not do much byte swapping. On a big endian cpu, these routines are
a no-op.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:56 +10:00
Cédric Le Goater
b636031a7b powerpc/boot: Fix compile warning in 64bit
arch/powerpc/boot/oflib.c:211:9: warning: cast to pointer from integer of \
		  different size [-Wint-to-pointer-cast]
  return (phandle) of_call_prom("finddevice", 1, 1, name);

This is a work around. The definite solution would be to define the
phandle typedef as a u32, as in the kernel, but this would break the
device tree ops API.

Let it be for the moment.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:51 +10:00
Cédric Le Goater
6413010936 powerpc/boot: Define typedef ihandle as u32
This makes ihandle 64bit friendly.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:47 +10:00
Cédric Le Goater
034e55e6c2 powerpc/boot: Rework of_claim() to make it 64bit friendly
This patch fixes 64bit compile warnings and updates the wrapper code
to converge the kernel code in prom_init.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:43 +10:00
Cédric Le Goater
9cc36bb0ac powerpc/boot: Add PROM_ERROR define in oflib
This is mostly useful to make to the boot wrapper code closer with
the kernel code in prom_init.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:39 +10:00
Cédric Le Goater
926e6940f5 powerpc/boot: Add byteswapping routines in oflib
Values will need to be byte-swapped when calling prom (big endian) from
a little endian boot wrapper.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:35 +10:00
Cédric Le Goater
163bed77b9 powerpc/boot: Use prom_arg_t in oflib
This patch updates the wrapper code to converge with the kernel code in
prom_init.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:31 +10:00
Cédric Le Goater
fed23ed7eb powerpc/boot: Use a common prom_args struct in oflib
This patch fixes warnings when the wrapper is compiled in 64bit and
updates the boot wrapper code related to prom to converge with the
kernel code in prom_init. This should make the review of changes easier.

The kernel has a different number of possible arguments (10) when
entering prom. There does not seem to be any good reason to have
12 in the wrapper, so the patch changes this value to args[10] in
the prom_args struct.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:26 +10:00
Cédric Le Goater
f4bce2f784 powerpc/boot: Fix do_div for 64bit wrapper
When the boot wrapper is compiled in 64bit, there is no need to
use __div64_32.

Signed-off-by: Cédric Le Goater <clg@fr.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:22 +10:00
Gavin Shan
a7d0431774 powerpc/prom: Stop scanning dev-tree for fdump early
Function early_init_dt_scan_fw_dump() is called to scan the device
tree for fdump properties under node "rtas". Any one of them is
invalid, we can stop scanning the device tree early by returning
"1". It would save a bit time during boot.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:18 +10:00
Gavin Shan
e9bc03fe22 powerpc/powernv: Don't use pe->pbus to get the domain number
If the PE contains single PCI function, "pe->pbus" would be NULL.
It's not reliable to be used by pci_domain_nr().  We just grab the
PCI domain number from the PCI host controller (struct pci_controller)
instance.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:14 +10:00
Gavin Shan
65fd766b99 powerpc/powernv: Missed IOMMU table type
In function pnv_pci_ioda2_setup_dma_pe(), the IOMMU table type is
set to (TCE_PCI_SWINV_CREATE | TCE_PCI_SWINV_FREE) unconditionally.
It was just set to TCE_PCI by pnv_pci_setup_iommu_table(). So the
primary IOMMU table type (TCE_PCI) is lost. The patch fixes it.

Also, pnv_pci_setup_iommu_table() already set "tbl->it_busno" to
zero and we needn't do it again. The patch removes the redundant
assignment.

The patch also fixes similar issues in pnv_pci_ioda_setup_dma_pe().

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:10 +10:00
Gavin Shan
b2b5efcf20 powerpc/powernv: Fundamental reset on PLX ports
The patch intends to support fundamental reset on PLX downstream
ports. If the PCI device matches any one of the internal table,
which includes PLX vendor ID, bridge device ID, register offset
for fundamental reset and bit, fundamental reset will be done
accordingly. Otherwise, it will fail back to hot reset.

Additional flag (EEH_DEV_FRESET) is introduced to record the last
reset type on the PCI bridge.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:05 +10:00
Gavin Shan
35845a7826 powerpc/eeh: Can't recover from non-PE-reset case
When PCI_ERS_RESULT_CAN_RECOVER returned from device drivers, the
EEH core should enable I/O and DMA for the affected PE. However,
it was missed to have DMA enabled in eeh_handle_normal_event().
Besides, the frozen state of the affected PE should be cleared
after successful recovery, but we didn't.

The patch fixes both of the issues as above.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:35:01 +10:00
Gavin Shan
361f2a2a15 powrpc/powernv: Reset PHB in kdump kernel
In the kdump scenario, the first kerenl doesn't shutdown PCI devices
and the kdump kerenl clean PHB IODA table at the early probe time.
That means the kdump kerenl can't support PCI transactions piled
by the first kerenl. Otherwise, lots of EEH errors and frozen PEs
will be detected.

In order to avoid the EEH errors, the PHB is resetted to drop all
PCI transaction from the first kerenl.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:57 +10:00
Gavin Shan
d92a208d08 powerpc/pci: Mask linkDown on resetting PCI bus
The problem was initially reported by Wendy who tried pass through
IPR adapter, which was connected to PHB root port directly, to KVM
based guest. When doing that, pci_reset_bridge_secondary_bus() was
called by VFIO driver and linkDown was detected by the root port.
That caused all PEs to be frozen.

The patch fixes the issue by routing the reset for the secondary bus
of root port to underly firmware. For that, one more weak function
pci_reset_secondary_bus() is introduced so that the individual platforms
can override that and do specific reset for bridge's secondary bus.

Reported-by: Wendy Xiong <wenxiong@linux.vnet.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:53 +10:00
Gavin Shan
26833a5029 powerpc/eeh: Make the delay for PE reset unified
Basically, we have 3 types of resets to fulfil PE reset: fundamental,
hot and PHB reset. For the later 2 cases, we need PCI bus reset hold
and settlement delay as specified by PCI spec. PowerNV and pSeries
platforms are running on top of different firmware and some of the
delays have been covered by underly firmware (PowerNV).

The patch makes the delays unified to be done in backend, instead of
EEH core.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:48 +10:00
Gavin Shan
fd5cee7ce8 powerpc/powernv: Reset root port in firmware
Resetting root port has more stuff to do than that for PCIe switch
ports and we should have resetting root port done in firmware instead
of the kernel itself. The problem was introduced by commit 5b2e198e
("powerpc/powernv: Rework EEH reset").

Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:44 +10:00
Gavin Shan
54f112a383 powerpc/pseries: Fix overwritten PE state
In pseries_eeh_get_state(), EEH_STATE_UNAVAILABLE is always
overwritten by EEH_STATE_NOT_SUPPORT because of the missed
"break" there. The patch fixes the issue.

Reported-by: Joe Perches <joe@perches.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:40 +10:00
Gavin Shan
63796558d4 powerpc/powernv: Fix endless reporting frozen PE
Once one specific PE has been marked as EEH_PE_ISOLATED, it's in
the middile of recovery or removed permenently. We needn't report
the frozen PE again. Otherwise, we will have endless reporting
same frozen PE.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:36 +10:00
Gavin Shan
d2b0f6f77e powerpc/eeh: No hotplug on permanently removed dev
The issue was detected in a bit complicated test case where
we have multiple hierarchical PEs shown as following figure:

                +-----------------+
                | PE#3     p2p#0  |
                |          p2p#1  |
                +-----------------+
                        |
                +-----------------+
                | PE#4     pdev#0 |
                |          pdev#1 |
                +-----------------+

PE#4 (have 2 PCI devices) is the child of PE#3, which has 2 p2p
bridges. We accidentally had less-known scenario: PE#4 was removed
permanently from the system because of permanent failure (e.g.
exceeding the max allowd failure times in last hour), then we detects
EEH errors on PE#3 and tried to recover it. However, eeh_dev instances
for pdev#0/1 were not detached from PE#4, which was still connected to
PE#3. All of that was because of the fact that we rely on count-based
pcibios_release_device(), which isn't reliable enough. When doing
recovery for PE#3, we still apply hotplug on PE#4 and pdev#0/1, which
are not valid any more. Eventually, we run into kernel crash.

The patch fixes above issue from two aspects. For unplug, we simply
skip those permanently removed PE, whose state is (EEH_PE_STATE_ISOLATED
&& !EEH_PE_STATE_RECOVERING) and its frozen count should be greater
than EEH_MAX_ALLOWED_FREEZES. For plug, we marked all permanently
removed EEH devices with EEH_DEV_REMOVED and return 0xFF's on read
its PCI config so that PCI core will omit them.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:32 +10:00
Gavin Shan
7f52a526f6 powerpc/eeh: Allow to disable EEH
The patch introduces bootarg "eeh=off" to disable EEH functinality.
Also, it creates /sys/kerenl/debug/powerpc/eeh_enable to disable
or enable EEH functionality. By default, we have the functionality
enabled.

For PowerNV platform, we will restore to have the conventional
mechanism of clearing frozen PE during PCI config access if we're
going to disable EEH functionality. Conversely, we will rely on
EEH for error recovery.

The patch also fixes the issue that we missed to cover the case
of disabled EEH functionality in function ioda_eeh_event(). Those
events driven by interrupt should be cleared to avoid endless
reporting.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:27 +10:00
Gavin Shan
8a5ad35686 powerpc/eeh: Cleanup EEH subsystem variables
There're 2 EEH subsystem variables: eeh_subsystem_enabled and
eeh_probe_mode. We needn't maintain 2 variables and we can just
have one variable and introduce different flags. The patch also
introduces additional flag EEH_FORCE_DISABLE, which will be used
to disable EEH subsystem via boot parameter ("eeh=off") in future.
Besides, the patch also introduces flag EEH_ENABLED, which is
changed to disable or enable EEH functionality on the fly through
debugfs entry in future.

With the patch applied, the creteria to check the enabled EEH
functionality is changed to:

!EEH_FORCE_DISABLED && EEH_ENABLED : Enabled
                       Other cases : Disabled

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:23 +10:00
Gavin Shan
2a18dfc6ee powerpc/eeh: Use cached capability for log dump
When calling into eeh_gather_pci_data() on pSeries platform, we
possiblly don't have pci_dev instance yet, but eeh_dev is always
ready. So we use cached capability from eeh_dev instead of pci_dev
for log dump there. In order to keep things unified, we also cache
PCI capability positions to eeh_dev for PowerNV as well.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:19 +10:00
Gavin Shan
2d86c385a1 powerpc/eeh: Cleanup eeh_gather_pci_data()
The patch replaces printk(KERN_WARNING ...) with pr_warn() in the
function eeh_gather_pci_data().

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:14 +10:00
Gavin Shan
7895470063 powerpc/eeh: Avoid I/O access during PE reset
We have suffered recrusive frozen PE a lot, which was caused
by IO accesses during the PE reset. Ben came up with the good
idea to keep frozen PE until recovery (BAR restore) gets done.
With that, IO accesses during PE reset are dropped by hardware
and wouldn't incur the recrusive frozen PE any more.

The patch implements the idea. We don't clear the frozen state
until PE reset is done completely. During the period, the EEH
core expects unfrozen state from backend to keep going. So we
have to reuse EEH_PE_RESET flag, which has been set during PE
reset, to return normal state from backend. The side effect is
we have to clear frozen state for towice (PE reset and clear it
explicitly), but that's harmless.

We have some limitations on pHyp. pHyp doesn't allow to enable
IO or DMA for unfrozen PE. So we don't enable them on unfrozen PE
in eeh_pci_enable(). We have to enable IO before grabbing logs on
pHyp. Otherwise, 0xFF's is always returned from PCI config space.
Also, we had wrong return value from eeh_pci_enable() for
EEH_OPT_THAW_DMA case. The patch fixes it too.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:10 +10:00
Gavin Shan
1d9a544646 powerpc/powernv: Use EEH PCI config accessors
For EEH PowerNV backends, they need use their own PCI config
accesors as the normal one could be blocked during PE reset.
The patch also removes necessary parameter "hose" for the
function ioda_eeh_bridge_reset().

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:06 +10:00
Gavin Shan
d0914f503f powerpc/eeh: Block PCI-CFG access during PE reset
We've observed multiple PE reset failures because of PCI-CFG
access during that period. Potentially, some device drivers
can't support EEH very well and they can't put the device to
motionless state before PE reset. So those device drivers might
produce PCI-CFG accesses during PE reset. Also, we could have
PCI-CFG access from user space (e.g. "lspci"). Since access to
frozen PE should return 0xFF's, we can block PCI-CFG access
during the period of PE reset so that we won't get recrusive EEH
errors.

The patch adds flag EEH_PE_RESET, which is kept during PE reset.
The PowerNV/pSeries PCI-CFG accessors reuse the flag to block
PCI-CFG accordingly.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:34:02 +10:00
Gavin Shan
7b401850a1 powerpc/eeh: EEH_PE_ISOLATED not reflect HW state
When doing PE reset, EEH_PE_ISOLATED is cleared unconditionally.
However, We should remove that if the PE reset has cleared the
frozen state successfully. Otherwise, the flag should be kept.
The patch fixes the issue.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:33:57 +10:00
Gavin Shan
b34497d184 powerpc/powernv: Remove fields in PHB diag-data dump
For some fields (e.g. LEM, MMIO, DMA) in PHB diag-data dump, it's
meaningless to print them if they have non-zero value in the
corresponding mask registers because we always have non-zero values
in the mask registers. The patch only prints those fieds if we
have non-zero values in the primary registers (e.g. LEM, MMIO, DMA
status) so that we can save couple of lines. The patch also removes
unnecessary spare line before "brdgCtl:" and two leading spaces as
prefix in each line as Ben suggested.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:33:52 +10:00
Gavin Shan
f5bc6b70d2 powerpc/powernv: Move PNV_EEH_STATE_ENABLED around
The flag PNV_EEH_STATE_ENABLED is put into pnv_phb::eeh_state,
which is protected by CONFIG_EEH. We needn't that. Instead, we
can have pnv_phb::flags and maintain all flags there, which is
the purpose of the patch. The patch also renames PNV_EEH_STATE_ENABLED
to PNV_PHB_FLAG_EEH.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:33:48 +10:00
Gavin Shan
467f79a956 powerpc/powernv: Remove PNV_EEH_STATE_REMOVED
The PHB state PNV_EEH_STATE_REMOVED maintained in pnv_phb isn't
so useful any more and it's duplicated to EEH_PE_ISOLATED. The
patch replaces PNV_EEH_STATE_REMOVED with EEH_PE_ISOLATED.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:33:44 +10:00
Gavin Shan
9e04937560 powerpc/eeh: Remove EEH_PE_PHB_DEAD
The PE state (for eeh_pe instance) EEH_PE_PHB_DEAD is duplicate to
EEH_PE_ISOLATED. Originally, those PHBs (PHB PE) with EEH_PE_PHB_DEAD
would be removed from the system. However, it's safe to replace
that with EEH_PE_ISOLATED.

The patch also clear EEH_PE_RECOVERING after fenced PHB has been handled,
either failure or success. It makes the PHB PE state consistent with:

	PHB functions normally		  NONE
	PHB has been removed		  EEH_PE_ISOLATED
	PHB fenced, recovery in progress  EEH_PE_ISOLATED | RECOVERING

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 17:33:39 +10:00
Alistair Popple
e4565362c7 powerpc/4xx: Fix section mismatch in ppc4xx_pci.c
This patch fixes this section mismatch:

WARNING: vmlinux.o(.text+0x1efc4): Section mismatch in reference from
the function apm821xx_pciex_init_port_hw() to the function
.init.text:ppc4xx_pciex_wait_on_sdr.isra.9()

The function apm821xx_pciex_init_port_hw() references the function
__init ppc4xx_pciex_wait_on_sdr.isra.9().  This is often because
apm821xx_pciex_init_port_hw lacks a __init annotation or the
annotation of ppc4xx_pciex_wait_on_sdr.isra.9 is wrong.

apm821xx_pciex_init_port_hw is only referenced by a struct in
__initdata, so it should be safe to add __init to
apm821xx_pciex_init_port_hw.

Signed-off-by: Alistair Popple <alistair@popple.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:32:53 +10:00
Preeti U Murthy
582b910eda ppc/kvm: Clear the runlatch bit of a vcpu before napping
When the guest cedes the vcpu or the vcpu has no guest to
run it naps. Clear the runlatch bit of the vcpu before
napping to indicate an idle cpu.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:32:49 +10:00
Preeti U Murthy
fd17dc7b9a ppc/kvm: Set the runlatch bit of a CPU just before starting guest
The secondary threads in the core are kept offline before launching guests
in kvm on powerpc: "371fefd6f2dc4666:KVM: PPC: Allow book3s_hv guests to use
SMT processor modes."

Hence their runlatch bits are cleared. When the secondary threads are called
in to start a guest, their runlatch bits need to be set to indicate that they
are busy. The primary thread has its runlatch bit set though, but there is no
harm in setting this bit once again. Hence set the runlatch bit for all
threads before they start guest.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:32:45 +10:00
Preeti U Murthy
f203891117 ppc/powernv: Set the runlatch bits correctly for offline cpus
Up until now we have been setting the runlatch bits for a busy CPU and
clearing it when a CPU enters idle state. The runlatch bit has thus
been consistent with the utilization of a CPU as long as the CPU is online.

However when a CPU is hotplugged out the runlatch bit is not cleared. It
needs to be cleared to indicate an unused CPU. Hence this patch has the
runlatch bit cleared for an offline CPU just before entering an idle state
and sets it immediately after it exits the idle state.

Signed-off-by: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:32:40 +10:00
Li Zhong
42dbfc8649 powerpc/pseries: Protect remove_memory() with device hotplug lock
While testing memory hot-remove, I found following dead lock:

Process #1141 is drmgr, trying to remove some memory, i.e. memory499.
It holds the memory_hotplug_mutex, and blocks when trying to remove file
"online" under dir memory499, in kernfs_drain(), at
        wait_event(root->deactivate_waitq,
                   atomic_read(&kn->active) == KN_DEACTIVATED_BIAS);

Process #1120 is trying to online memory499 by
   echo 1 > memory499/online

In .kernfs_fop_write, it uses kernfs_get_active() to increase
&kn->active, thus blocking process #1141. While itself is blocked later
when trying to acquire memory_hotplug_mutex, which is held by process

The backtrace of both processes are shown below:

[<c000000001b18600>] 0xc000000001b18600
[<c000000000015044>] .__switch_to+0x144/0x200
[<c000000000263ca4>] .online_pages+0x74/0x7b0
[<c00000000055b40c>] .memory_subsys_online+0x9c/0x150
[<c00000000053cbe8>] .device_online+0xb8/0x120
[<c00000000053cd04>] .online_store+0xb4/0xc0
[<c000000000538ce4>] .dev_attr_store+0x64/0xa0
[<c00000000030f4ec>] .sysfs_kf_write+0x7c/0xb0
[<c00000000030e574>] .kernfs_fop_write+0x154/0x1e0
[<c000000000268450>] .vfs_write+0xe0/0x260
[<c000000000269144>] .SyS_write+0x64/0x110
[<c000000000009ffc>] syscall_exit+0x0/0x7c

[<c000000001b18600>] 0xc000000001b18600
[<c000000000015044>] .__switch_to+0x144/0x200
[<c00000000030be14>] .__kernfs_remove+0x204/0x300
[<c00000000030d428>] .kernfs_remove_by_name_ns+0x68/0xf0
[<c00000000030fb38>] .sysfs_remove_file_ns+0x38/0x60
[<c000000000539354>] .device_remove_attrs+0x54/0xc0
[<c000000000539fd8>] .device_del+0x158/0x250
[<c00000000053a104>] .device_unregister+0x34/0xa0
[<c00000000055bc14>] .unregister_memory_section+0x164/0x170
[<c00000000024ee18>] .__remove_pages+0x108/0x4c0
[<c00000000004b590>] .arch_remove_memory+0x60/0xc0
[<c00000000026446c>] .remove_memory+0x8c/0xe0
[<c00000000007f9f4>] .pseries_remove_memblock+0xd4/0x160
[<c00000000007fcfc>] .pseries_memory_notifier+0x27c/0x290
[<c0000000008ae6cc>] .notifier_call_chain+0x8c/0x100
[<c0000000000d858c>] .__blocking_notifier_call_chain+0x6c/0xe0
[<c00000000071ddec>] .of_property_notify+0x7c/0xc0
[<c00000000071ed3c>] .of_update_property+0x3c/0x1b0
[<c0000000000756cc>] .ofdt_write+0x3dc/0x740
[<c0000000002f60fc>] .proc_reg_write+0xac/0x110
[<c000000000268450>] .vfs_write+0xe0/0x260
[<c000000000269144>] .SyS_write+0x64/0x110
[<c000000000009ffc>] syscall_exit+0x0/0x7c

This patch uses lock_device_hotplug() to protect remove_memory() called
in pseries_remove_memblock(), which is also stated before function
remove_memory():

 * NOTE: The caller must call lock_device_hotplug() to serialize hotplug
 * and online/offline operations before this call, as required by
 * try_offline_node().
 */
void __ref remove_memory(int nid, u64 start, u64 size)

With this lock held, the other process(#1120 above) trying to online the
memory block will retry the system call when calling
lock_device_hotplug_sysfs(), and finally find No such device error.

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:32:14 +10:00
Anton Blanchard
0c93069210 powerpc: Fix error return in rtas_flash module init
module_init should return 0 or a negative errno.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:32:07 +10:00
Anton Blanchard
579a53cafd powerpc: Bump BOOT_COMMAND_LINE_SIZE to 2048
Bump the boot wrapper BOOT_COMMAND_LINE_SIZE to match the
kernel.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:32:02 +10:00
Anton Blanchard
a5980d064f powerpc: Bump COMMAND_LINE_SIZE to 2048
I've had a report that the current limit is too small for
an automated network based installer. Bump it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:31:58 +10:00
Anton Blanchard
a2dd5da77f powerpc: Rename duplicate COMMAND_LINE_SIZE define
We have two definitions of COMMAND_LINE_SIZE, one for the kernel
and one for the boot wrapper. I assume this is so the boot
wrapper can be self sufficient and not rely on kernel headers.

Having two defines with the same name is confusing, I just
updated the wrong one when trying to bump it.

Make the boot wrapper define unique by calling it
BOOT_COMMAND_LINE_SIZE.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:31:54 +10:00
Cody P Schafer
bbad3e50e8 powerpc/perf/hv-24x7: Catalog version number is be64, not be32
The catalog version number was changed from a be32 (with proceeding
32bits of padding) to a be64, update the code to treat it as a be64

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 16:31:50 +10:00
Cody P Schafer
1ee9fcc1a0 powerpc/perf/hv-24x7: Remove [static 4096], sparse chokes on it
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:27 +10:00
Cody P Schafer
78d13166b1 powerpc/perf/hv-24x7: Use (unsigned long) not (u32) values when calling plpar_hcall_norets()
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:26 +10:00
Cody P Schafer
58a685c2d8 powerpc/perf/hv-gpci: Make device attr static
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:26 +10:00
Cody P Schafer
0a8cf9e28c powerpc/perf/hv_gpci: Probe failures use pr_debug(), and padding reduced
fixup for "powerpc/perf: Add support for the hv gpci (get performance
counter info) interface".

Makes the "not enabled" message less awful (and hidden unless
debugging).

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:25 +10:00
Cody P Schafer
e98bf005d5 powerpc/perf/hv_24x7: Probe errors changed to pr_debug(), padding fixed
fixup for "powerpc/perf: Add support for the hv 24x7 interface"

Makes the "not enabled" message less awful (and hides it in most cases).

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:25 +10:00
Aneesh Kumar K.V
29ef7a3e26 powerpc/mm: Fix tlbie to add AVAL fields for 64K pages
The if condition check was based on a draft ISA doc. Remove the same.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:24 +10:00
Anton Blanchard
2d6b63bbdd powerpc/powernv: Fix little endian issues in OPAL dump code
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:24 +10:00
Anton Blanchard
3441f04b4b powerpc/powernv: Create OPAL sglist helper functions and fix endian issues
We have two copies of code that creates an OPAL sg list. Consolidate
these into a common set of helpers and fix the endian issues.

The flash interface embedded a version number in the num_entries
field, whereas the dump interface did did not. Since versioning
wasn't added to the flash interface and it is impossible to add
this in a backwards compatible way, just remove it.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:23 +10:00
Anton Blanchard
14ad0c58d5 powerpc/powernv: Fix little endian issues in OPAL error log code
Fix little endian issues with the OPAL error log code.

Signed-off-by: Anton Blanchard <anton@samba.org>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:23 +10:00
Anton Blanchard
56b4c99312 powerpc/powernv: Fix little endian issues with opal_do_notifier calls
The bitmap in opal_poll_events and opal_handle_interrupt is
big endian, so we need to byteswap it on little endian builds.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:22 +10:00
Anton Blanchard
e2c8b93e65 powerpc/powernv: Remove some OPAL function declaration duplication
We had some duplication of the internal OPAL functions.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:21 +10:00
Anton Blanchard
2bad742388 powerpc/powernv: Use uint64_t instead of size_t in OPAL APIs
Using size_t in our APIs is asking for trouble, especially
when some OPAL calls use size_t pointers.

Signed-off-by: Anton Blanchard <anton@samba.org>
Reviewed-by: Stewart Smith <stewart@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:21 +10:00
Wei Yang
4966bfa1b3 powerpc/powernv: Release the refcount for pci_dev
On PowerNV platform, we are holding an unnecessary refcount on a pci_dev, which
leads to the pci_dev is not destroyed when hotplugging a pci device.

This patch release the unnecessary refcount.

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:20 +10:00
Wei Yang
3f28c5af39 powerpc/powernv: Reduce multi-hit of iommu_add_device()
During the EEH hotplug event, iommu_add_device() will be invoked three times
and two of them will trigger warning or error.

The three times to invoke the iommu_add_device() are:

    pci_device_add
       ...
       set_iommu_table_base_and_group   <- 1st time, fail
    device_add
       ...
       tce_iommu_bus_notifier           <- 2nd time, succees
    pcibios_add_pci_devices
       ...
       pcibios_setup_bus_devices        <- 3rd time, re-attach

The first time fails, since the dev->kobj->sd is not initialized. The
dev->kobj->sd is initialized in device_add().
The third time's warning is triggered by the re-attach of the iommu_group.

After applying this patch, the error

    iommu_tce: 0003:05:00.0 has not been added, ret=-14

and the warning

    [  204.123609] ------------[ cut here ]------------
    [  204.123645] WARNING: at arch/powerpc/kernel/iommu.c:1125
    [  204.123680] Modules linked in: xt_CHECKSUM nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6t_REJECT bnep bluetooth 6lowpan_iphc rfkill xt_conntrack ebtable_nat ebtable_broute bridge stp llc mlx4_ib ib_sa ib_mad ib_core ib_addr ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw bnx2x tg3 mlx4_core nfsd ptp mdio ses libcrc32c nfs_acl enclosure be2net pps_core shpchp lockd kvm uinput sunrpc binfmt_misc lpfc scsi_transport_fc ipr scsi_tgt
    [  204.124356] CPU: 18 PID: 650 Comm: eehd Not tainted 3.14.0-rc5yw+ #102
    [  204.124400] task: c0000027ed485670 ti: c0000027ed50c000 task.ti: c0000027ed50c000
    [  204.124453] NIP: c00000000003cf80 LR: c00000000006c648 CTR: c00000000006c5c0
    [  204.124506] REGS: c0000027ed50f440 TRAP: 0700   Not tainted  (3.14.0-rc5yw+)
    [  204.124558] MSR: 9000000000029032 <SF,HV,EE,ME,IR,DR,RI>  CR: 88008084  XER: 20000000
    [  204.124682] CFAR: c00000000006c644 SOFTE: 1
    GPR00: c00000000006c648 c0000027ed50f6c0 c000000001398380 c0000027ec260300
    GPR04: c0000027ea92c000 c00000000006ad00 c0000000016e41b0 0000000000000110
    GPR08: c0000000012cd4c0 0000000000000001 c0000027ec2602ff 0000000000000062
    GPR12: 0000000028008084 c00000000fdca200 c0000000000d1d90 c0000027ec281a80
    GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
    GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000001
    GPR24: 000000005342697b 0000000000002906 c000001fe6ac9800 c000001fe6ac9800
    GPR28: 0000000000000000 c0000000016e3a80 c0000027ea92c090 c0000027ea92c000
    [  204.125353] NIP [c00000000003cf80] .iommu_add_device+0x30/0x1f0
    [  204.125399] LR [c00000000006c648] .pnv_pci_ioda_dma_dev_setup+0x88/0xb0
    [  204.125443] Call Trace:
    [  204.125464] [c0000027ed50f6c0] [c0000027ed50f750] 0xc0000027ed50f750 (unreliable)
    [  204.125526] [c0000027ed50f750] [c00000000006c648] .pnv_pci_ioda_dma_dev_setup+0x88/0xb0
    [  204.125588] [c0000027ed50f7d0] [c000000000069cc8] .pnv_pci_dma_dev_setup+0x78/0x340
    [  204.125650] [c0000027ed50f870] [c000000000044408] .pcibios_setup_device+0x88/0x2f0
    [  204.125712] [c0000027ed50f940] [c000000000046040] .pcibios_setup_bus_devices+0x60/0xd0
    [  204.125774] [c0000027ed50f9c0] [c000000000043acc] .pcibios_add_pci_devices+0xdc/0x1c0
    [  204.125837] [c0000027ed50fa50] [c00000000086f970] .eeh_reset_device+0x36c/0x4f0
    [  204.125939] [c0000027ed50fb20] [c00000000003a2d8] .eeh_handle_normal_event+0x448/0x480
    [  204.126068] [c0000027ed50fbc0] [c00000000003a35c] .eeh_handle_event+0x4c/0x340
    [  204.126192] [c0000027ed50fc80] [c00000000003a74c] .eeh_event_handler+0xfc/0x1b0
    [  204.126319] [c0000027ed50fd30] [c0000000000d1ea0] .kthread+0x110/0x130
    [  204.126430] [c0000027ed50fe30] [c00000000000a460] .ret_from_kernel_thread+0x5c/0x7c
    [  204.126556] Instruction dump:
    [  204.126610] 7c0802a6 fba1ffe8 fbc1fff0 fbe1fff8 f8010010 f821ff71 7c7e1b78 60000000
    [  204.126787] 60000000 e87e0298 3143ffff 7d2a1910 <0b090000> 2fa90000 40de00c8 ebfe0218
    [  204.126966] ---[ end trace 6e7aefd80add2973 ]---

are cleared.

This patch removes iommu_add_device() in pnv_pci_ioda_dma_dev_setup(), which
revert part of the change in commit d905c5df(PPC: POWERNV: move
iommu_add_device earlier).

Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:11:20 +10:00
Anton Blanchard
cc146d1db0 powerpc/powernv: Fix little endian issues in OPAL flash code
With this patch I was able to update firmware on an LE kernel.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:08:50 +10:00
Benjamin Herrenschmidt
298b34d7d5 powerpc/powernv: Fix kexec races going back to OPAL
We have a subtle race when sending CPUs back to OPAL on kexec.

We mark them as "in real mode" right before we send them down. Once
we've booted the new kernel, it might try to call opal_reinit_cpus()
to change endianness, and that requires all CPUs to be spinning inside
OPAL.

However there is no synchronization here and we've observed cases
where the returning CPUs hadn't established their new state inside
OPAL before opal_reinit_cpus() is called, causing it to fail.

The proper fix is to actually wait for them to go down all the way
from the kexec'ing kernel.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:08:50 +10:00
Joel Stanley
63aecfb20a powerpc/powernv: Check sysparam size before creation
The size of the sysparam sysfs files is determined from the device tree
at boot. However the buffer is hard coded to 64 bytes. If we encounter a
parameter that is larger than 64, or miss-parse the device tree, the
buffer will overflow when reading or writing to the parameter.

Check it at discovery time, and if the parameter is too large, do not
create a sysfs entry for it.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:08:49 +10:00
Joel Stanley
16003d235b powerpc/powernv: Fix typos in sysparam code
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:08:49 +10:00
Joel Stanley
85390378f0 powerpc/powernv: Check sysfs size before copying
The sysparam code currently uses the userspace supplied number of
bytes when memcpy()ing in to a local 64-byte buffer.

Limit the maximum number of bytes by the size of the buffer.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:08:48 +10:00
Joel Stanley
b8569d2304 powerpc/powernv: Use ssize_t for sysparam return values
The OPAL calls are returning int64_t values, which the sysparam code
stores in an int, and the sysfs callback returns ssize_t. Make code a
easier to read by consistently using ssize_t.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:08:48 +10:00
Joel Stanley
ba9a32b176 powerpc/powernv: Fix sysparam sysfs error handling
When a sysparam query in OPAL returned a negative value (error code),
sysfs would spew out a decent chunk of memory; almost 64K more than
expected. This was traced to a sign/unsigned mix up in the OPAL sysparam
sysfs code at sys_param_show.

The return value of sys_param_show is a ssize_t, calculated using

  return ret ? ret : attr->param_size;

Alan Modra explains:

  "attr->param_size" is an unsigned int, "ret" an int, so the overall
  expression has type unsigned int.  Result is that ret is cast to
  unsigned int before being cast to ssize_t.

Instead of using the ternary operator, set ret to the param_size if an
error is not detected. The same bug exists in the sysfs write callback;
this patch fixes it in the same way.

A note on debugging this next time: on my system gcc will warn about
this if compiled with -Wsign-compare, which is not enabled by -Wall,
only -Wextra.

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:08:47 +10:00
Li Zhong
4fb8d027dc powerpc: Fix Oops in rtas_stop_self()
commit 41dd03a9 may cause Oops in rtas_stop_self().

The reason is that the rtas_args was moved into stack space. For a box
with more that 4GB RAM, the stack could easily be outside 32bit range,
but RTAS is 32bit.

So the patch moves rtas_args away from stack by adding static before
it.

Signed-off-by: Li Zhong <zhong@linux.vnet.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:08:47 +10:00
Jeff Mahoney
28ea3c7529 powerpc: Export flush_icache_range
Commit aac416fc38 (lkdtm: flush icache and report actions) calls
flush_icache_range from a module. It's exported on most architectures
that implement it, but not on powerpc. This patch exports it to fix
the module link failure.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-04-28 13:08:46 +10:00
Anton Blanchard
721aeaa9fd powerpc: Build little endian ppc64 kernel with ABIv2
Build the little endian ppc64 kernel with ABIv2 if the toolchain
supports it. We can identify an ABIv2 capable toolchain by the
-mabi=elfv2 compiler flag.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:08:07 +10:00
Anton Blanchard
24a1bdc358 powerpc/ftrace: Fix ABIv2 issues with __ftrace_make_call
__ftrace_make_call assumed ABIv1 TOC stack offsets, so it
broke on ABIv2.

While we are here, we can simplify the instruction modification
code. Since we always update one instruction there is no need to
probe_kernel_write and flush_icache_range, just use patch_branch.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:35 +10:00
Anton Blanchard
62c9da6a8b powerpc/ftrace: Use module loader helpers to parse trampolines
Now we have is_module_trampoline() and module_trampoline_target()
we can remove a bunch of intimate kernel module trampoline
knowledge from ftrace.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:35 +10:00
Anton Blanchard
dd9fa16250 powerpc/modules: Create module_trampoline_target()
ftrace has way too much knowledge of our kernel module trampoline
layout hidden inside it. Create module_trampoline_target() that gives
the target address of a kernel module trampoline.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:34 +10:00
Anton Blanchard
83775b8566 powerpc/modules: Create is_module_trampoline()
ftrace has way too much knowledge of our kernel module trampoline
layout hidden inside it. Create is_module_trampoline() that can
abstract this away inside the module loader code.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:34 +10:00
Anton Blanchard
47f86b4e07 powerpc/kprobes: Fix ABIv2 issues with kprobe_lookup_name
Use ppc_function_entry in places where we previously assumed
function descriptors exist.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:33 +10:00
Anton Blanchard
5e66684fe4 powerpc: ftrace_caller, _mcount is exported to modules so needs _GLOBAL_TOC()
When testing the ftrace function tracer, I realised that ftrace_caller
and mcount are called from modules and they both call into C, therefore
they need the ABIv2 global entry point to establish r2.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:33 +10:00
Anton Blanchard
169c7cee31 powerpc: Add _GLOBAL_TOC for ABIv2 assembly functions exported to modules
If an assembly function that calls back into c code is exported to
modules, we need to ensure r2 is setup correctly. There are only
two places crazy enough to do it (two of which are my fault).

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:32 +10:00
Rusty Russell
008d7a914e powerpc: modules: implement stubs for ELFv2 ABI.
ELFv2 doesn't use function descriptors, because it doesn't need to
load a new r2 when calling into a function.  On the other hand, you're
supposed to use a local entry point for R_PPC_REL24 branches.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:32 +10:00
Rusty Russell
5c729a115e powerpc: modules: skip r2 setup for ELFv2
ELFv2 doesn't need to set up r2 when calling a function.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:31 +10:00
Rusty Russell
b1ce369e82 powerpc: modules: use r12 for stub jump address.
In ELFv2, r12 is supposed to equal to PC on entry to a function.
Our stubs use r11, so change swap that with r12.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:31 +10:00
Rusty Russell
d2fae54803 powerpc: modules: change r2 save/restore offset for ELFv2 ABI.
ELFv2 uses a different stack offset (24 vs 40) to save r2.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:30 +10:00
Rusty Russell
5b12c5c694 powerpc: modules: comment about de-dotifying symbols when using the ELFv2 ABI.
ELFv2 doesn't use function descriptors, so we don't expect symbols to
start with ".".  But because depmod and modpost strip ".", and we have
the special symbol ".TOC.", we still need to do it.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:30 +10:00
Rusty Russell
0906584a0a powerpc: Handle new ELFv2 module relocations
The new ELF ABI tends to use R_PPC64_REL16_LO and R_PPC64_REL16_HA
relocations (PC-relative), so implement them.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:29 +10:00
Rusty Russell
4edebbeae3 powerpc: Fix up TOC. for modules.
The kernel resolved the '.TOC.' to a fake symbol, so we need to fix it up
to point to our .toc section plus 0x8000.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:29 +10:00
Rusty Russell
71ec7c55ed powerpc: module: handle MODVERSION for .TOC.
For the ELFv2 ABI, powerpc introduces a magic symbol ".TOC.".  If we
don't create a CRC for it (minus the leading ".", since we strip that)
we get a modpost warning about missing CRC and the CRC array seems to
be displaced by 1 so other CRCs mismatch too.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:28 +10:00
Rusty Russell
9baeaef640 powerpc: EXPORT_SYMBOL(.TOC.)
For the ELFv2 ABI, powerpc introduces a magic symbol ".TOC.".  depmod
then complains that this doesn't resolve (so does modpost, but we could
easily fix that).  To export this, we need to use asm.

modpost and depmod both strip "." from symbols for the old PPC64 ELFv1
ABI, so we actually export a "TOC.".

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:28 +10:00
Rusty Russell
d247da0a8e powerpc: modules implement R_PPC64_TOCSAVE relocation.
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:28 +10:00
Rusty Russell
0e60e46e2a powerpc: make module stub code endian independent
By representing them as words, rather than chars, we can avoid
endian ifdefs.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2014-04-23 10:05:27 +10:00
Anton Blanchard
07de8377f7 powerpc: Fix ABIv2 issue with dereference_function_descriptor
Don't try and dereference a function descriptor on ABIv2.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:26 +10:00
Anton Blanchard
2751b628c9 powerpc: Fix SMP issues with ppc64le ABIv2
There is no need to put a function descriptor in
__secondary_hold_spinloop. Use ppc_function_entry to get the
instruction address and put it in __secondary_hold_spinloop instead.

Also fix an issue where we assumed cur_cpu_spec held a function
descriptor.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:26 +10:00
Anton Blanchard
d51959d70f powerpc/tracing: TRACE_WITH_FRAME_BUFFER creates invalid stack frames
TRACE_WITH_FRAME_BUFFER creates 32 byte stack frames. On ppc64
ABIv1 this is too small and a callee could corrupt the stack by
writing to the parameter save area (starting at offset 48).

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:25 +10:00
Anton Blanchard
6403105bfd powerpc/tm: Fix GOT save offset for ABIv2
The r2 TOC/GOT save offset is 40 on ABIv1 and 24 on ABIv2.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:25 +10:00
Anton Blanchard
c2e31bdc12 powerpc/tm: Use STK_PARAM
Get rid of the tm specific STACK_PARAM and use STK_PARAM

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:24 +10:00
Ulrich Weigand
752a6422fe powerpc: Fix unsafe accesses to parameter area in ELFv2
Some of the assembler files in lib/ make use of the fact that in the
ELFv1 ABI, the caller guarantees to provide stack space to save the
parameter registers r3 ... r10.  This guarantee is no longer present
in ELFv2 for functions that have no variable argument list and no
more than 8 arguments.

Change the affected routines to temporarily store registers in the
red zone and/or the top of their own stack frame (in the space
provided to save r31 .. r29, which is actually not used in these
routines).

In opal_query_takeover, simply always allocate a stack frame;
the routine is not performance critical.

Signed-off-by: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:24 +10:00
Anton Blanchard
b37c10d128 powerpc: Fix ABIv2 issues with stack offsets in assembly code
Fix STK_PARAM and use it instead of hardcoding ABIv1 offsets.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:23 +10:00
Anton Blanchard
7cedd6014b powerpc: Fix kernel thread creation on ABIv2
Change how we setup registers for ret_from_kernel_thread. In
ABIv1, instead of passing a function descriptor in, dereference
it and pass the target in directly.

Use ppc_global_function_entry to get it right on both ABIv1 and ABIv2.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:23 +10:00
Anton Blanchard
b86206e4c3 powerpc: Fix branch patching code for ABIv2
The MMU hashtable and SLB branch patching code uses function
pointers for the update sites. This creates a difference between
ABIv1 and ABIv2 because we don't have function descriptors on
ABIv2.

Get rid of the function pointer and just point at the update
sites directly. This works on both ABIs.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:22 +10:00
Anton Blanchard
26f9206056 powerpc: Use ppc_function_entry instead of open coding it
Replace FUNCTION_TEXT with ppc_function_entry which can handle both
ABIv1 and ABIv2.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:22 +10:00
Anton Blanchard
c71b7eff42 powerpc: Add ABIv2 support to ppc_function_entry
Skip over the well known global entry point code for ABIv2.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:21 +10:00
Anton Blanchard
814e4cd98f powerpc: Ignore .TOC. relocations
The linker fixes up .TOC. relocations, so prom_init_check.sh should
ignore them.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:21 +10:00
Anton Blanchard
cc7efbf919 powerpc: ABIv2 function calls must place target address in r12
To establish addressability quickly, ABIv2 requires the target
address of the function being called to be in r12. Fix a number of
places in assembly code that we do indirect function calls.

We need to avoid function descriptors on ABIv2 too.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:20 +10:00
Anton Blanchard
7167af7ceb powerpc: Remove function descriptors and dot symbols on new ABI
ABIv2 doesn't have function descriptors or dot symbols. One
new thing it does add is a function global and a local entry
point, so add that to our _GLOBAL macro.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:20 +10:00
Anton Blanchard
c1fb019477 powerpc: Create DOTSYM to wrap dot symbol usage
There are a few places we have to use dot symbols with the
current ABI - the syscall table and the kvm hcall table.

Wrap both of these with a new macro called DOTSYM so it will
be easy to transition away from dot symbols in a future ABI.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:19 +10:00
Anton Blanchard
354255014a powerpc: Remove dot symbol usage in exception macros
STD_EXCEPTION_COMMON, STD_EXCEPTION_COMMON_ASYNC and
MASKABLE_EXCEPTION branch to the handler, so we can remove
the explicit dot symbol and binutils will do the right thing.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:19 +10:00
Anton Blanchard
a0e971ffb9 powerpc: Remove _INIT_GLOBAL(), _STATIC() and _INIT_STATIC()
Now there are no users of _INIT_GLOBAL(), _STATIC() and _INIT_STATIC()
we can remove them.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:18 +10:00
Anton Blanchard
6a3bab90cf powerpc: Remove some unnecessary uses of _GLOBAL() and _STATIC()
There is no need to create a function descriptor for functions
called locally out of assembly.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:18 +10:00
Anton Blanchard
c857c43b34 powerpc: Don't use a function descriptor for system call table
There is no need to create a function descriptor for the system call
table. By using one we force the system call table into the text
section and it really belongs in the rodata section.

This also removes another use of dot symbols.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:17 +10:00
Anton Blanchard
ad0289e4ac powerpc: Remove superflous function descriptors in assembly only code
We have a number of places where we load the text address of a local
function and indirectly branch to it in assembly. Since it is an
indirect branch binutils will not know to use the function text
address, so that trick wont work.

There is no need for these functions to have a function descriptor
so we can replace it with a label and remove the dot symbol.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:17 +10:00
Anton Blanchard
b1576fec7f powerpc: No need to use dot symbols when branching to a function
binutils is smart enough to know that a branch to a function
descriptor is actually a branch to the functions text address.

Alan tells me that binutils has been doing this for 9 years.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:05:16 +10:00
Anton Blanchard
58aedccb19 powerpc: Don't build assembly files with ABIv2
We avoid ABIv2 when building c files since commit b2ca8c89 (powerpc:
Don't use ELFv2 ABI to build the kernel). Do the same for assembly
files.

Signed-off-by: Anton Blanchard <anton@samba.org>
2014-04-23 10:02:04 +10:00
Mike Qiu
12c743eb22 powerpc/mm: fix ".__node_distance" undefined
CHK     include/config/kernel.release
  CHK     include/generated/uapi/linux/version.h
  CHK     include/generated/utsrelease.h
  ...
  Building modules, stage 2.
WARNING: 1 bad relocations
c0000000013d6a30 R_PPC64_ADDR64    uprobes_fetch_type_table
  WRAP    arch/powerpc/boot/zImage.pseries
  WRAP    arch/powerpc/boot/zImage.epapr
  MODPOST 1849 modules
ERROR: ".__node_distance" [drivers/block/nvme.ko] undefined!
make[1]: *** [__modpost] Error 1
make: *** [modules] Error 2
make: *** Waiting for unfinished jobs....

The reason is symbol "__node_distance" not been exported in powerpc.

Signed-off-by: Mike Qiu <qiudayu@linux.vnet.ibm.com>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Cc: Jesse Larrew <jlarrew@linux.vnet.ibm.com>
Cc: Robert Jennings <rcj@linux.vnet.ibm.com>
Cc: Alistair Popple <alistair@popple.id.au>
Cc: Mike Qiu <qiudayu@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-04-18 16:40:08 -07:00
Peter Zijlstra
c645073f7e arch,powerpc: Convert smp_mb__*()
Powerpc allows reordering over its ll/sc implementation. Implement the
two new barriers as appropriate.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-gg2ffgq32sjgy9b8lj6m3hsc@git.kernel.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: linux-kernel@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-04-18 14:20:41 +02:00
Mike Qiu
140ab6452c powerpc/PCI: Fix NULL dereference in sys_pciconfig_iobase() list traversal
3bc955987f ("powerpc/PCI: Use list_for_each_entry() for bus traversal")
caused a NULL pointer dereference because the loop body set the iterator to
NULL:

  Unable to handle kernel paging request for data at address 0x00000000
  Faulting instruction address: 0xc000000000041d78
  Oops: Kernel access of bad area, sig: 11 [#1]
  ...
  NIP [c000000000041d78] .sys_pciconfig_iobase+0x68/0x1f0
  LR [c000000000041e0c] .sys_pciconfig_iobase+0xfc/0x1f0
  Call Trace:
  [c0000003b4787db0] [c000000000041e0c] .sys_pciconfig_iobase+0xfc/0x1f0 (unreliable)
  [c0000003b4787e30] [c000000000009ed8] syscall_exit+0x0/0x98

Fix it by using a temporary variable for the iterator.

[bhelgaas: changelog, drop tmp_bus initialization]
Fixes: 3bc955987f powerpc/PCI: Use list_for_each_entry() for bus traversal
Signed-off-by: Mike Qiu <qiudayu@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2014-04-14 16:33:49 -06:00
Mike Qiu
ff0c41b2df powerpc/PCI: Fix NULL dereference in sys_pciconfig_iobase() list traversal
3bc955987f ("powerpc/PCI: Use list_for_each_entry() for bus traversal")
caused a NULL pointer dereference because the loop body set the iterator to
NULL:

  Unable to handle kernel paging request for data at address 0x00000000
  Faulting instruction address: 0xc000000000041d78
  Oops: Kernel access of bad area, sig: 11 [#1]
  ...
  NIP [c000000000041d78] .sys_pciconfig_iobase+0x68/0x1f0
  LR [c000000000041e0c] .sys_pciconfig_iobase+0xfc/0x1f0
  Call Trace:
  [c0000003b4787db0] [c000000000041e0c] .sys_pciconfig_iobase+0xfc/0x1f0 (unreliable)
  [c0000003b4787e30] [c000000000009ed8] syscall_exit+0x0/0x98

Fix it by using a temporary variable for the iterator.

[bhelgaas: changelog, drop tmp_bus initialization]
Fixes: 3bc955987f powerpc/PCI: Use list_for_each_entry() for bus traversal
Signed-off-by: Mike Qiu <qiudayu@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2014-04-14 16:12:35 -06:00