- Add a whitelist of Root Complexes known to support peer-to-peer DMA
between Root Ports (Christian König)
* pci/peer-to-peer:
PCI/P2PDMA: Allow P2P DMA between any devices under AMD ZEN Root Complex
- Fix RPA and RPA DLPAR refcount issues (Tyrel Datwyler)
- Stop exporting pci_get_hp_params() (Alexandru Gagniuc)
- Simplify _HPP, _HPX parsing (Alexandru Gagniuc)
- Add support for _HPX Type 3 settings (Alexandru Gagniuc)
- Tell firmware we support _HPX Type 3 via _OSC (Alexandru Gagniuc)
* pci/hotplug:
PCI/ACPI: Advertise _HPX Type 3 support via _OSC
PCI/ACPI: Implement _HPX Type 3 Setting Record
PCI/ACPI: Remove the need for 'struct hotplug_params'
PCI/ACPI: Do not export pci_get_hp_params()
PCI: rpaphp: Get/put device node reference during slot alloc/dealloc
PCI: rpadlpar: Fix leaked device_node references in add/remove paths
- Enable PCIe services for host controller drivers that use managed host
bridge alloc (Jean-Philippe Brucker)
- Add quirk to clear PCIe Retrain Link bit to work around Pericom bridge
erratum (Stefan Mätje)
- Add "external-facing" DT property to identify cases where we require
IOMMU protection from untrusted devices (Jean-Philippe Brucker)
- Support fixed bus numbers from bridge Enhanced Allocation capabilities
(Subbaraya Sundeep)
* pci/enumeration:
PCI: Assign bus numbers present in EA capability for bridges
PCI: OF: Support "external-facing" property
dt-bindings: Add "external-facing" PCIe port property
PCI: Rework pcie_retrain_link() wait loop
PCI: Work around Pericom PCIe-to-PCI bridge Retrain Link erratum
PCI: Factor out pcie_retrain_link() function
PCI: Init PCIe feature bits for managed host bridge alloc
The PCI specs say that peer-to-peer DMA should be supported between any two
devices that have a common upstream PCI-to-PCI bridge. But devices under
different Root Ports don't share a common upstream bridge, and PCIe r4.0,
sec 1.3.1, says routing peer-to-peer transactions between Root Ports in the
same Root Complex is optional.
Many Root Complexes, including AMD ZEN, *do* support peer-to-peer DMA even
between Root Ports. Add a whitelist and allow peer-to-peer DMA if both
participants are attached to a Root Complex known to support it.
Link: https://lore.kernel.org/linux-pci/20190418115859.2394-1-christian.koenig@amd.com
Signed-off-by: Christian König <christian.koenig@amd.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Use new helper pci_dev_id() to simplify the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-By: Benson Leung <bleung@chromium.org>
Use new helper pci_dev_id() to simplify the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Use new helper pci_dev_id() to simplify the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
Use new helper pci_dev_id() to simplify the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Joerg Roedel <jroedel@suse.de>
Use new helper pci_dev_id() to simplify the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Christian König <christian.koenig@amd.com>
Use new helper pci_dev_id() to simplify the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Use new helper pci_dev_id() to simplify the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: David S. Miller <davem@davemloft.net>
In several places in the kernel we find PCI_DEVID used like this:
PCI_DEVID(dev->bus->number, dev->devfn)
Add a "pci_dev_id(struct pci_dev *dev)" helper to simplify callers.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
On ThinkPad P50 SKUs with an Nvidia Quadro M1000M instead of the M2000M
variant, the BIOS does not always reset the secondary Nvidia GPU during
reboot if the laptop is configured in Hybrid Graphics mode. The reason is
unknown, but the following steps and possibly a good bit of patience will
reproduce the issue:
1. Boot up the laptop normally in Hybrid Graphics mode
2. Make sure nouveau is loaded and that the GPU is awake
3. Allow the Nvidia GPU to runtime suspend itself after being idle
4. Reboot the machine, the more sudden the better (e.g. sysrq-b may help)
5. If nouveau loads up properly, reboot the machine again and go back to
step 2 until you reproduce the issue
This results in some very strange behavior: the GPU will be left in exactly
the same state it was in when the previously booted kernel started the
reboot. This has all sorts of bad side effects: for starters, this
completely breaks nouveau starting with a mysterious EVO channel failure
that happens well before we've actually used the EVO channel for anything:
nouveau 0000:01:00.0: disp: chid 0 mthd 0000 data 00000400 00001000 00000002
This causes a timeout trying to bring up the GR ctx:
nouveau 0000:01:00.0: timeout
WARNING: CPU: 0 PID: 12 at drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf100.c:1547 gf100_grctx_generate+0x7b2/0x850 [nouveau]
Hardware name: LENOVO 20EQS64N0B/20EQS64N0B, BIOS N1EET82W (1.55 ) 12/18/2018
Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper]
...
nouveau 0000:01:00.0: gr: wait for idle timeout (en: 1, ctxsw: 0, busy: 1)
nouveau 0000:01:00.0: gr: wait for idle timeout (en: 1, ctxsw: 0, busy: 1)
nouveau 0000:01:00.0: fifo: fault 01 [WRITE] at 0000000000008000 engine 00 [GR] client 15 [HUB/SCC_NB] reason c4 [] on channel -1 [0000000000 unknown]
The GPU never manages to recover. Booting without loading nouveau causes
issues as well, since the GPU starts sending spurious interrupts that cause
other device's IRQs to get disabled by the kernel:
irq 16: nobody cared (try booting with the "irqpoll" option)
...
handlers:
[<000000007faa9e99>] i801_isr [i2c_i801]
Disabling IRQ #16
...
serio: RMI4 PS/2 pass-through port at rmi4-00.fn03
i801_smbus 0000:00:1f.4: Timeout waiting for interrupt!
i801_smbus 0000:00:1f.4: Transaction timeout
rmi4_f03 rmi4-00.fn03: rmi_f03_pt_write: Failed to write to F03 TX register (-110).
i801_smbus 0000:00:1f.4: Timeout waiting for interrupt!
i801_smbus 0000:00:1f.4: Transaction timeout
rmi4_physical rmi4-00: rmi_driver_set_irq_bits: Failed to change enabled interrupts!
This causes the touchpad and sometimes other things to get disabled.
Since this happens without nouveau, we can't fix this problem from nouveau
itself.
Add a PCI quirk for the specific P50 variant of this GPU. Make sure the
GPU is advertising NoReset- so we don't reset the GPU when the machine is
in Dedicated graphics mode (where the GPU being initialized by the BIOS is
normal and expected). Map the GPU MMIO space and read the magic 0x2240c
register, which will have bit 1 set if the device was POSTed during a
previous boot. Once we've confirmed all of this, reset the GPU and
re-disable it - bringing it back to a healthy state.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=203003
Link: https://lore.kernel.org/lkml/20190212220230.1568-1-lyude@redhat.com
Signed-off-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: nouveau@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Cc: Karol Herbst <kherbst@redhat.com>
Cc: Ben Skeggs <skeggsb@gmail.com>
Cc: stable@vger.kernel.org
_OSC now has a way to inform firmware that OS has the capability to
interpret _HPX Type 3 setting records. This was added by the following
PCI Firmware Specification ECN:
ECN: _HPX and PCIe Completion Timeout related _OSC Enhancements
Date: September 12, 2018
Affected Document: PCI Firmware Specification, Rev. 3.2
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
The _HPX Type 3 Setting Record is intended to be more generic and allow
configuration of settings not possible with Type 2 records. For example,
firmware could ensure that the completion timeout value is set accordingly
throughout the PCI tree.
Implement support for _HPX Type 3 Setting Records, which were added in the
ACPI 6.3 spec.
Link: https://lore.kernel.org/lkml/20190208162414.3996-4-mr.nuke.me@gmail.com
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
We used to first parse all the _HPP and _HPX tables before using the
information to program registers of PCIe devices. Up through HPX Type 2,
there was only one structure of each type, so we could cheat and store it
on the stack.
With HPX Type 3 we get an arbitrary number of entries, so the above model
doesn't scale that well. Instead of parsing all tables at once, parse and
program each entry separately. For _HPP and _HPX Types 0 through 2, this
is functionally equivalent. The change enables the upcoming _HPX Type 3 to
integrate more easily.
Link: https://lore.kernel.org/lkml/20190208162414.3996-3-mr.nuke.me@gmail.com
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
[bhelgaas: fix build errors]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
pci_get_hp_params() is only used within drivers/pci, and there is no reason
to make it available outside of the PCI core, so stop exporting it.
Link: https://lore.kernel.org/lkml/20190208162414.3996-2-mr.nuke.me@gmail.com
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
If the bandwidth notification interrupt is left unmasked when entering
suspend to idle, it triggers immediately bringing the system back to
working state.
To keep that from happening, disable the interrupt when entering system
sleep and enable it again during resume.
Reported-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
When running application tool switchtec-user's `firmware update` and `event
wait` commands concurrently, sometimes the firmware update speed reduced
significantly.
It is because when the MRPC event happened after MRPC event occurrence
check but before the event mask loop reaches its header register in event
ISR, the MRPC event would be masked unintentionally. Since there's no
chance to enable it again except for a module reload, all the following
MRPC execution completion checks time out.
Fix this bug by skipping the mask operation for MRPC event in event ISR,
same as what we already do for LINK event.
Fixes: 52eabba5bc ("switchtec: Add IOCTLs to the Switchtec driver")
Signed-off-by: Wesley Sheng <wesley.sheng@microchip.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
The Switchtec devices supports two PCIe Function Frameworks (PFFs) per
upstream port (one for the port itself and one for the management endoint),
and each PFF may have up to 255 ports. Previously the driver only
supported 48 of those ports, and the SWITCHTEC_IOCTL_EVENT_SUMMARY ioctl
only returned information about those 48.
Increase SWITCHTEC_MAX_PFF_CSR from 48 to 255 so the driver supports all
255 possible ports.
Rename SWITCHTEC_IOCTL_EVENT_SUMMARY and associated struct
switchtec_ioctl_event_summary to SWITCHTEC_IOCTL_EVENT_SUMMARY_LEGACY and
switchtec_ioctl_event_summary_legacy with so existing applications work
unchanged, supporting up to 48 ports.
Add replacement SWITCHTEC_IOCTL_EVENT_SUMMARY and struct
switchtec_ioctl_event_summary that new and recompiled applications support
up to 255 ports.
Signed-off-by: Wesley Sheng <wesley.sheng@microchip.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
In pcibios_irq_init(), the PCI IRQ routing table 'pirq_table' is first
found through pirq_find_routing_table(). If the table is not found and
CONFIG_PCI_BIOS is defined, the table is then allocated in
pcibios_get_irq_routing_table() using kmalloc(). Later, if the I/O APIC is
used, this table is actually not used. In that case, the allocated table
is not freed, which is a memory leak.
Free the allocated table if it is not used.
Signed-off-by: Wenwen Wang <wang6495@umn.edu>
[bhelgaas: added Ingo's reviewed-by, since the only change since v1 was to
use the irq_routing_table local variable name he suggested]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
pci_request_region_exclusive() was introduced with commit e8de1481fd
("resource: allow MMIO exclusivity for device drivers") in 2.6.29 which
was released 2008.
It never had an in tree user since then, so after 11 years later let's
remove it.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
The "Enhanced Allocation (EA) for Memory and I/O Resources" ECN, approved
23 October 2014, sec 6.9.1.2, specifies a second DW in the capability for
type 1 (bridge) functions to describe fixed secondary and subordinate bus
numbers. This ECN was included in the PCIe r4.0 spec, but sec 6.9.1.2 was
omitted, presumably by mistake.
Read fixed bus numbers from the EA capability for bridges.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
[bhelgaas: add pci_ea_fixed_busnrs() return value]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Set the "untrusted" attribute to any PCIe port that has an
"external-facing" device tree property. Any device downstream of this port
will inherit the attribute and have only the strictest IOMMU protection.
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Provide a way for the firmware to tell the OS which devices are external to
the machine and therefore untrusted. The property can describe for example
Thunderbolt and other user-accessible ports, which should always have the
strongest IOMMU protection.
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Grant Likely <grant.likely@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
When allocating the slot structure we store a pointer to the associated
device_node. We really should be incrementing the reference count, so add
an of_node_get() during slot alloc and an of_node_put() during slot
dealloc.
Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
The find_dlpar_node() helper returns a device node with its reference
incremented. Both the add and remove paths use this helper for find the
appropriate node, but fail to release the reference when done.
Annotate the find_dlpar_node() helper with a comment about the incremented
reference count and call of_node_put() on the obtained device_node in the
add and remove paths. Also, fixup a reference leak in the find_vio_slot()
helper where we fail to call of_node_put() on the vdevice node after we
iterate over its children.
Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Transform wait code to a "do {} while (time_before())" loop as recommended
by reviewer. No functional change intended.
Signed-off-by: Stefan Mätje <stefan.maetje@esd.eu>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Due to an erratum in some Pericom PCIe-to-PCI bridges in reverse mode
(conventional PCI on primary side, PCIe on downstream side), the Retrain
Link bit needs to be cleared manually to allow the link training to
complete successfully.
If it is not cleared manually, the link training is continuously restarted
and no devices below the PCI-to-PCIe bridge can be accessed. That means
drivers for devices below the bridge will be loaded but won't work and may
even crash because the driver is only reading 0xffff.
See the Pericom Errata Sheet PI7C9X111SLB_errata_rev1.2_102711.pdf for
details. Devices known as affected so far are: PI7C9X110, PI7C9X111SL,
PI7C9X130.
Add a new flag, clear_retrain_link, in struct pci_dev. Quirks for affected
devices set this bit.
Note that pcie_retrain_link() lives in aspm.c because that's currently the
only place we use it, but this erratum is not specific to ASPM, and we may
retrain links for other reasons in the future.
Signed-off-by: Stefan Mätje <stefan.maetje@esd.eu>
[bhelgaas: apply regardless of CONFIG_PCIEASPM]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: stable@vger.kernel.org
Factor out pcie_retrain_link() to use for Pericom Retrain Link quirk. No
functional change intended.
Signed-off-by: Stefan Mätje <stefan.maetje@esd.eu>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
CC: stable@vger.kernel.org
Two functions allocate a host bridge: devm_pci_alloc_host_bridge() and
pci_alloc_host_bridge(). At the moment, only the unmanaged one initializes
the PCIe feature bits, which prevents from using features such as hotplug
or AER on some systems, when booting with device tree. Make the
initialization code common.
Fixes: 02bfeb4842 ("PCI/portdrv: Simplify PCIe feature permission checking")
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v4.17+
Change pcie-xilinx-nwl.c to use pci_msi_mask_irq() and pci_msi_unmask_irq()
like all other PCI host controller drivers. Remove the now-unused
mask_msi_irq() and unmask_msi_irq().
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Michal Simek <michal.simek@xilinx.com>
CC: linux-arm-kernel@lists.infradead.org
Remove unused __write_msi_msg() and write_msi_msg().
These were added by 83a18912b0 ("PCI/MSI: Rename write_msi_msg() to
pci_write_msi_msg()"), they served their purpose, and they're no longer
needed.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Jiang Liu <jiang.liu@linux.intel.com> # 83a18912b0 author
In preparation to enabling -Wimplicit-fallthrough, mark switch
cases where we are expecting to fall through.
This patch fixes the following warnings:
drivers/pci/proc.c: In function ‘proc_bus_pci_ioctl’:
drivers/pci/proc.c:216:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
if (arch_can_pci_mmap_wc()) {
^
drivers/pci/proc.c:225:2: note: here
default:
^~~~~~~
drivers/pci/xen-pcifront.c: In function ‘pcifront_backend_changed’:
drivers/pci/xen-pcifront.c:1105:6: warning: this statement may fall through [-Wimplicit-fallthrough=]
if (xdev->state == XenbusStateClosed)
^
drivers/pci/xen-pcifront.c:1108:2: note: here
case XenbusStateClosing:
^~~~
Notice that, in this particular case, the /* fall through */
comment is placed at the very bottom of the case statement,
which is what GCC is expecting to find.
Warning level 3 was used: -Wimplicit-fallthrough=3
This patch is part of the ongoing efforts to enable
-Wimplicit-fallthrough.
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Pull x86 asm updates from Thomas Gleixner:
"Two cleanup patches removing dead conditionals and unused code"
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/asm: Remove unused __constant_c_x_memset() macro and inlines
x86/asm: Remove dead __GNUC__ conditionals
Pull perf fixes from Thomas Gleixner:
"Three fixes for the fallout from the TSX errata workaround:
- Prevent memory corruption caused by a unchecked out of bound array
index.
- Two trivial fixes to address compiler warnings"
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf/x86/intel: Make dev_attr_allow_tsx_force_abort static
perf/x86: Fixup typo in stub functions
perf/x86/intel: Fix memory corruption
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Merge tag 'for-linus-5.1b-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fix from Juergen Gross:
"A fix for a Xen bug introduced by David's series for excluding
ballooned pages in vmcores"
* tag 'for-linus-5.1b-rc1b-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
xen/balloon: Fix mapping PG_offline pages to user space
Two fixes (leak on invalid mount argument and possible deadlock on
i_size update on 32bit smp) and a fall-through warning cleanup
----------------------------------------------------------------
Gustavo A. R. Silva (1):
9p: mark expected switch fall-through
Hou Tao (1):
9p: use inode->i_lock to protect i_size_write() under 32-bit
zhengbin (1):
9p/net: fix memory leak in p9_client_create
fs/9p/v9fs_vfs.h | 23 +++++++++++++++++++++--
fs/9p/vfs_file.c | 6 +++++-
fs/9p/vfs_inode.c | 23 +++++++++++------------
fs/9p/vfs_inode_dotl.c | 27 ++++++++++++++-------------
fs/9p/vfs_super.c | 4 ++--
net/9p/client.c | 2 +-
net/9p/trans_xen.c | 2 +-
7 files changed, 55 insertions(+), 32 deletions(-)
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Merge tag '9p-for-5.1' of git://github.com/martinetd/linux
Pull 9p updates from Dominique Martinet:
"Here is a 9p update for 5.1; there honestly hasn't been much.
Two fixes (leak on invalid mount argument and possible deadlock on
i_size update on 32bit smp) and a fall-through warning cleanup"
* tag '9p-for-5.1' of git://github.com/martinetd/linux:
9p/net: fix memory leak in p9_client_create
9p: use inode->i_lock to protect i_size_write() under 32-bit
9p: mark expected switch fall-through
When this .gitignore was added, lxdialog was an independent hostprogs-y.
Now that all objects in lxdialog/ are directly linked to mconf, the
lxdialog is no longer generated.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Currently, every arch/*/include/uapi/asm/Kbuild explicitly includes
the common Kbuild.asm file. Factor out the duplicated include directives
to scripts/Makefile.asm-generic so that no architecture would opt out
of the mandatory-y mechanism.
um is not forced to include mandatory-y since it is a very exceptional
case which does not support UAPI.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
