The _DSM #5 method in the ACPI host bridge object tells us whether the OS
must preserve the resource assignments done by firmware. If this is the
case, we should not permit drivers to resize BARs on the fly. Make
pci_resize_resource() take this into account.
Link: https://lore.kernel.org/r/20210109095353.13417-1-ardb@kernel.org
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org # v5.4+
The lkml.org, spinics.net, and gmane.org archives are not very reliable
and, in some cases, not even easily accessible. Replace links to them with
links to lore.kernel.org, the archives hosted by kernel.org.
I found the gmane items via the Wayback Machine archive at
https://web.archive.org/.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
When resizing a BAR, pci_reassign_bridge_resources() is invoked to bring
the bridge windows of parent bridges in line with the new BAR assignment.
This assumes the device whose BAR is being resized lives on a subordinate
bus, but this is not necessarily the case. A device may live on the root
bus, in which case dev->bus->self is NULL, and passing a NULL pci_dev
pointer to pci_reassign_bridge_resources() will cause it to crash.
So let's make the call to pci_reassign_bridge_resources() conditional on
whether dev->bus->self is non-NULL in the first place.
Fixes: 8bb705e3e7 ("PCI: Add pci_resize_resource() for resizing BARs")
Link: https://lore.kernel.org/r/20200421162256.26887-1-ardb@kernel.org
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
When reassigning device resources to increase their alignment, e.g.,
because of a "pci=resource_alignment=" kernel parameter or because the
platform aligns resources to its page size, we previously emitted messages
like this:
pci 0000:00:00.0: Disabling memory decoding and releasing memory resources
pci 0000:00:00.0: disabling bridge mem windows
These messages don't convey any useful information, so remove them.
Fixes: 3827463769 ("powerpc/powernv: Override pcibios_default_alignment() to force PCI devices to be page aligned")
Signed-off-by: Desnes A. Nunes do Rosario <desnesn@linux.vnet.ibm.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <helgaas@kernel.org>
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Merge tag 'pci-v4.17-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
Pull PCI updates from Bjorn Helgaas:
- move pci_uevent_ers() out of pci.h (Michael Ellerman)
- skip ASPM common clock warning if BIOS already configured it (Sinan
Kaya)
- fix ASPM Coverity warning about threshold_ns (Gustavo A. R. Silva)
- remove last user of pci_get_bus_and_slot() and the function itself
(Sinan Kaya)
- add decoding for 16 GT/s link speed (Jay Fang)
- add interfaces to get max link speed and width (Tal Gilboa)
- add pcie_bandwidth_capable() to compute max supported link bandwidth
(Tal Gilboa)
- add pcie_bandwidth_available() to compute bandwidth available to
device (Tal Gilboa)
- add pcie_print_link_status() to log link speed and whether it's
limited (Tal Gilboa)
- use PCI core interfaces to report when device performance may be
limited by its slot instead of doing it in each driver (Tal Gilboa)
- fix possible cpqphp NULL pointer dereference (Shawn Lin)
- rescan more of the hierarchy on ACPI hotplug to fix Thunderbolt/xHCI
hotplug (Mika Westerberg)
- add support for PCI I/O port space that's neither directly accessible
via CPU in/out instructions nor directly mapped into CPU physical
memory space. This is fairly intrusive and includes minor changes to
interfaces used for I/O space on most platforms (Zhichang Yuan, John
Garry)
- add support for HiSilicon Hip06/Hip07 LPC I/O space (Zhichang Yuan,
John Garry)
- use PCI_EXP_DEVCTL2_COMP_TIMEOUT in rapidio/tsi721 (Bjorn Helgaas)
- remove possible NULL pointer dereference in of_pci_bus_find_domain_nr()
(Shawn Lin)
- report quirk timings with dev_info (Bjorn Helgaas)
- report quirks that take longer than 10ms (Bjorn Helgaas)
- add and use Altera Vendor ID (Johannes Thumshirn)
- tidy Makefiles and comments (Bjorn Helgaas)
- don't set up INTx if MSI or MSI-X is enabled to align cris, frv,
ia64, and mn10300 with x86 (Bjorn Helgaas)
- move pcieport_if.h to drivers/pci/pcie/ to encapsulate it (Frederick
Lawler)
- merge pcieport_if.h into portdrv.h (Bjorn Helgaas)
- move workaround for BIOS PME issue from portdrv to PCI core (Bjorn
Helgaas)
- completely disable portdrv with "pcie_ports=compat" (Bjorn Helgaas)
- remove portdrv link order dependency (Bjorn Helgaas)
- remove support for unused VC portdrv service (Bjorn Helgaas)
- simplify portdrv feature permission checking (Bjorn Helgaas)
- remove "pcie_hp=nomsi" parameter (use "pci=nomsi" instead) (Bjorn
Helgaas)
- remove unnecessary "pcie_ports=auto" parameter (Bjorn Helgaas)
- use cached AER capability offset (Frederick Lawler)
- don't enable DPC if BIOS hasn't granted AER control (Mika Westerberg)
- rename pcie-dpc.c to dpc.c (Bjorn Helgaas)
- use generic pci_mmap_resource_range() instead of powerpc and xtensa
arch-specific versions (David Woodhouse)
- support arbitrary PCI host bridge offsets on sparc (Yinghai Lu)
- remove System and Video ROM reservations on sparc (Bjorn Helgaas)
- probe for device reset support during enumeration instead of runtime
(Bjorn Helgaas)
- add ACS quirk for Ampere (née APM) root ports (Feng Kan)
- add function 1 DMA alias quirk for Marvell 88SE9220 (Thomas
Vincent-Cross)
- protect device restore with device lock (Sinan Kaya)
- handle failure of FLR gracefully (Sinan Kaya)
- handle CRS (config retry status) after device resets (Sinan Kaya)
- skip various config reads for SR-IOV VFs as an optimization
(KarimAllah Ahmed)
- consolidate VPD code in vpd.c (Bjorn Helgaas)
- add Tegra dependency on PCI_MSI_IRQ_DOMAIN (Arnd Bergmann)
- add DT support for R-Car r8a7743 (Biju Das)
- fix a PCI_EJECT vs PCI_BUS_RELATIONS race condition in Hyper-V host
bridge driver that causes a general protection fault (Dexuan Cui)
- fix Hyper-V host bridge hang in MSI setup on 1-vCPU VMs with SR-IOV
(Dexuan Cui)
- fix Hyper-V host bridge hang when ejecting a VF before setting up MSI
(Dexuan Cui)
- make several structures static (Fengguang Wu)
- increase number of MSI IRQs supported by Synopsys DesignWare bridges
from 32 to 256 (Gustavo Pimentel)
- implemented multiplexed IRQ domain API and remove obsolete MSI IRQ
API from DesignWare drivers (Gustavo Pimentel)
- add Tegra power management support (Manikanta Maddireddy)
- add Tegra loadable module support (Manikanta Maddireddy)
- handle 64-bit BARs correctly in endpoint support (Niklas Cassel)
- support optional regulator for HiSilicon STB (Shawn Guo)
- use regulator bulk API for Qualcomm apq8064 (Srinivas Kandagatla)
- support power supplies for Qualcomm msm8996 (Srinivas Kandagatla)
* tag 'pci-v4.17-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (123 commits)
MAINTAINERS: Add John Garry as maintainer for HiSilicon LPC driver
HISI LPC: Add ACPI support
ACPI / scan: Do not enumerate Indirect IO host children
ACPI / scan: Rename acpi_is_serial_bus_slave() for more general use
HISI LPC: Support the LPC host on Hip06/Hip07 with DT bindings
of: Add missing I/O range exception for indirect-IO devices
PCI: Apply the new generic I/O management on PCI IO hosts
PCI: Add fwnode handler as input param of pci_register_io_range()
PCI: Remove __weak tag from pci_register_io_range()
MAINTAINERS: Add missing /drivers/pci/cadence directory entry
fm10k: Report PCIe link properties with pcie_print_link_status()
net/mlx5e: Use pcie_bandwidth_available() to compute bandwidth
net/mlx5: Report PCIe link properties with pcie_print_link_status()
net/mlx4_core: Report PCIe link properties with pcie_print_link_status()
PCI: Add pcie_print_link_status() to log link speed and whether it's limited
PCI: Add pcie_bandwidth_available() to compute bandwidth available to device
misc: pci_endpoint_test: Handle 64-bit BARs properly
PCI: designware-ep: Make dw_pcie_ep_reset_bar() handle 64-bit BARs properly
PCI: endpoint: Make sure that BAR_5 does not have 64-bit flag set when clearing
PCI: endpoint: Make epc->ops->clear_bar()/pci_epc_clear_bar() take struct *epf_bar
...
Remove pointless comments that tell us the file name, remove blank line
comments, follow multi-line comment conventions. No functional change
intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
It is entirely possible that the BIOS wasn't able to assign resources to a
device. In this case don't crash in pci_release_resource() when we try to
resize the resource.
Fixes: 8bb705e3e7 ("PCI: Add pci_resize_resource() for resizing BARs")
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
CC: stable@vger.kernel.org # v4.15+
Add PCI-specific dev_printk() wrappers and use them to simplify the code
slightly. No functional change intended.
Signed-off-by: Frederick Lawler <fred@fredlawl.com>
[bhelgaas: squash into one patch]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Many source files in the tree are missing licensing information, which
makes it harder for compliance tools to determine the correct license.
By default all files without license information are under the default
license of the kernel, which is GPL version 2.
Update the files which contain no license information with the 'GPL-2.0'
SPDX license identifier. The SPDX identifier is a legally binding
shorthand, which can be used instead of the full boiler plate text.
This patch is based on work done by Thomas Gleixner and Kate Stewart and
Philippe Ombredanne.
How this work was done:
Patches were generated and checked against linux-4.14-rc6 for a subset of
the use cases:
- file had no licensing information it it.
- file was a */uapi/* one with no licensing information in it,
- file was a */uapi/* one with existing licensing information,
Further patches will be generated in subsequent months to fix up cases
where non-standard license headers were used, and references to license
had to be inferred by heuristics based on keywords.
The analysis to determine which SPDX License Identifier to be applied to
a file was done in a spreadsheet of side by side results from of the
output of two independent scanners (ScanCode & Windriver) producing SPDX
tag:value files created by Philippe Ombredanne. Philippe prepared the
base worksheet, and did an initial spot review of a few 1000 files.
The 4.13 kernel was the starting point of the analysis with 60,537 files
assessed. Kate Stewart did a file by file comparison of the scanner
results in the spreadsheet to determine which SPDX license identifier(s)
to be applied to the file. She confirmed any determination that was not
immediately clear with lawyers working with the Linux Foundation.
Criteria used to select files for SPDX license identifier tagging was:
- Files considered eligible had to be source code files.
- Make and config files were included as candidates if they contained >5
lines of source
- File already had some variant of a license header in it (even if <5
lines).
All documentation files were explicitly excluded.
The following heuristics were used to determine which SPDX license
identifiers to apply.
- when both scanners couldn't find any license traces, file was
considered to have no license information in it, and the top level
COPYING file license applied.
For non */uapi/* files that summary was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 11139
and resulted in the first patch in this series.
If that file was a */uapi/* path one, it was "GPL-2.0 WITH
Linux-syscall-note" otherwise it was "GPL-2.0". Results of that was:
SPDX license identifier # files
---------------------------------------------------|-------
GPL-2.0 WITH Linux-syscall-note 930
and resulted in the second patch in this series.
- if a file had some form of licensing information in it, and was one
of the */uapi/* ones, it was denoted with the Linux-syscall-note if
any GPL family license was found in the file or had no licensing in
it (per prior point). Results summary:
SPDX license identifier # files
---------------------------------------------------|------
GPL-2.0 WITH Linux-syscall-note 270
GPL-2.0+ WITH Linux-syscall-note 169
((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) 21
((GPL-2.0 WITH Linux-syscall-note) OR BSD-3-Clause) 17
LGPL-2.1+ WITH Linux-syscall-note 15
GPL-1.0+ WITH Linux-syscall-note 14
((GPL-2.0+ WITH Linux-syscall-note) OR BSD-3-Clause) 5
LGPL-2.0+ WITH Linux-syscall-note 4
LGPL-2.1 WITH Linux-syscall-note 3
((GPL-2.0 WITH Linux-syscall-note) OR MIT) 3
((GPL-2.0 WITH Linux-syscall-note) AND MIT) 1
and that resulted in the third patch in this series.
- when the two scanners agreed on the detected license(s), that became
the concluded license(s).
- when there was disagreement between the two scanners (one detected a
license but the other didn't, or they both detected different
licenses) a manual inspection of the file occurred.
- In most cases a manual inspection of the information in the file
resulted in a clear resolution of the license that should apply (and
which scanner probably needed to revisit its heuristics).
- When it was not immediately clear, the license identifier was
confirmed with lawyers working with the Linux Foundation.
- If there was any question as to the appropriate license identifier,
the file was flagged for further research and to be revisited later
in time.
In total, over 70 hours of logged manual review was done on the
spreadsheet to determine the SPDX license identifiers to apply to the
source files by Kate, Philippe, Thomas and, in some cases, confirmation
by lawyers working with the Linux Foundation.
Kate also obtained a third independent scan of the 4.13 code base from
FOSSology, and compared selected files where the other two scanners
disagreed against that SPDX file, to see if there was new insights. The
Windriver scanner is based on an older version of FOSSology in part, so
they are related.
Thomas did random spot checks in about 500 files from the spreadsheets
for the uapi headers and agreed with SPDX license identifier in the
files he inspected. For the non-uapi files Thomas did random spot checks
in about 15000 files.
In initial set of patches against 4.14-rc6, 3 files were found to have
copy/paste license identifier errors, and have been fixed to reflect the
correct identifier.
Additionally Philippe spent 10 hours this week doing a detailed manual
inspection and review of the 12,461 patched files from the initial patch
version early this week with:
- a full scancode scan run, collecting the matched texts, detected
license ids and scores
- reviewing anything where there was a license detected (about 500+
files) to ensure that the applied SPDX license was correct
- reviewing anything where there was no detection but the patch license
was not GPL-2.0 WITH Linux-syscall-note to ensure that the applied
SPDX license was correct
This produced a worksheet with 20 files needing minor correction. This
worksheet was then exported into 3 different .csv files for the
different types of files to be modified.
These .csv files were then reviewed by Greg. Thomas wrote a script to
parse the csv files and add the proper SPDX tag to the file, in the
format that the file expected. This script was further refined by Greg
based on the output to detect more types of files automatically and to
distinguish between header and source .c files (which need different
comment types.) Finally Greg ran the script using the .csv files to
generate the patches.
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Add a pci_resize_resource() interface to allow device drivers to resize
BARs of their devices.
This is useful for devices with large local storage, e.g., graphics
devices. These devices often only expose 256MB BARs initially to be
compatible with 32-bit systems.
This function only tries to reprogram the windows of the bridge directly
above the requesting device and only the BAR of the same type (usually mem,
64bit, prefetchable). This is done to avoid disturbing other drivers by
changing the BARs of their devices.
Drivers should use the following sequence to resize their BARs:
1. Disable memory decoding of the device using the PCI cfg dword.
2. Use pci_release_resource() to release all BARs which can move during the
resize, including the one you want to resize.
3. Call pci_resize_resource() for each BAR you want to resize.
4. Call pci_assign_unassigned_bus_resources() to reassign new locations
for all BARs which are not resized, but could move.
5. If everything worked as expected, enable memory decoding in the device
again using the PCI cfg dword.
Signed-off-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Multiple architectures define this as a trivial function, and I'm adding
another one as part of the RISC-V port. Add a __weak version of
pcibios_align_resource() and delete the now-obselete ones in a handful of
ports.
The only functional change should be that a handful of ports used to export
pcibios_fixup_bus(). Only some architectures export this, so I just
dropped it.
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
A 64-bit value is not needed since a PCI ROM address consists in 32 bits.
This fixes a clang warning about "implicit conversion from 'unsigned long'
to 'u32'".
Also remove now unnecessary casts to u32 from __pci_read_base() and
pci_std_update_resource().
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
* pci/host-rockchip:
PCI: rockchip: Move the deassert of pm/aclk/pclk after phy_init()
PCI: rockchip: Split out rockchip_cfg_atu()
PCI: rockchip: Clean up bit definitions for PCIE_RC_CONFIG_LCS
PCI: rockchip: Correct the use of FTS mask
PCI: rockchip: Remove the pointer to L1 substate cap
PCI: rockchip: Specify the link capability
PCI: rockchip: Fix negotiated lanes calculation
PCI: rockchip: Add Kconfig COMPILE_TEST
PCI: rockchip: Mark RC as common clock architecture
PCI: rockchip: Provide captured slot power limit and scale
PCI: rockchip: Add three new resets as required properties
PCI: Don't attempt to claim shadow copies of ROM
PCI: designware: Check for iATU unroll support after initializing host
PCI: qcom: Fix pp->dev usage before assignment
PCI: designware-plat: Update author email address
PCI: layerscape: Fix drvdata usage before assignment
PCI: designware-plat: Change maintainer to Jose Abreu
pci_update_resource() updates a hardware BAR so its address matches the
kernel's struct resource UNLESS it's a disabled ROM BAR. We only update
those when we enable the ROM.
It's not obvious from the code why ROM BARs should be handled specially.
Apparently there are Matrox devices with defective ROM BARs that read as
zero when disabled. That means that if pci_enable_rom() reads the disabled
BAR, sets PCI_ROM_ADDRESS_ENABLE (without re-inserting the address), and
writes it back, it would enable the ROM at address zero.
Add comments and references to explain why we can't make the code look more
rational.
The code changes are from 755528c860 ("Ignore disabled ROM resources at
setup") and 8085ce084c ("[PATCH] Fix PCI ROM mapping").
Link: https://lkml.org/lkml/2005/8/30/138
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
pci_std_update_resource() only deals with standard BARs, so we don't have
to worry about the complications of VF BARs in an SR-IOV capability.
Compute the BAR address inline and remove pci_resource_bar(). That makes
pci_iov_resource_bar() unused, so remove that as well.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Previously pci_update_resource() used the same code path for updating
standard BARs and VF BARs in SR-IOV capabilities.
Split the VF BAR update into a new pci_iov_update_resource() internal
interface, which makes it simpler to compute the BAR address (we can get
rid of pci_resource_bar() and pci_iov_resource_bar()).
This patch:
- Renames pci_update_resource() to pci_std_update_resource(),
- Adds pci_iov_update_resource(),
- Makes pci_update_resource() a wrapper that calls the appropriate one,
No functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
The BAR property bits (0-3 for memory BARs, 0-1 for I/O BARs) are supposed
to be read-only, but we do save them in res->flags and include them when
updating the BAR.
Mask the I/O property bits with ~PCI_BASE_ADDRESS_IO_MASK (0x3) instead of
PCI_REGION_FLAG_MASK (0xf) to make it obvious that we can't corrupt bits
2-3 of I/O addresses.
Use PCI_ROM_ADDRESS_MASK for ROM BARs. This means we'll only check the top
21 bits (instead of the 28 bits we used to check) of a ROM BAR to see if
the update was successful.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
VF BARs are read-only zero, so updating VF BARs will not have any effect.
See the SR-IOV spec r1.1, sec 3.4.1.11.
We already ignore these updates because of 70675e0b6a ("PCI: Don't try to
restore VF BARs"); this merely restructures it slightly to make it easier
to split updates for standard and SR-IOV BARs.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
If we're using a shadow copy of a PCI device ROM, the shadow copy is in RAM
and the device never sees accesses to it and doesn't respond to it. We
don't have to route the shadow range to the PCI device, and the device
doesn't have to claim the range.
Previously we treated the shadow copy as though it were the ROM BAR, and we
failed to claim it because the region wasn't routed to the device:
pci 0000:01:00.0: Video device with shadowed ROM at [mem 0x000c0000-0x000dffff]
pci_bus 0000:01: Allocating resources
pci 0000:01:00.0: can't claim BAR 6 [mem 0x000c0000-0x000dffff]: no compatible bridge window
The failure path of pcibios_allocate_dev_rom_resource() cleared out the
resource start address, which also caused the following ioremap() warning:
WARNING: CPU: 0 PID: 116 at /build/linux-akdJXO/linux-4.8.0/arch/x86/mm/ioremap.c:121 __ioremap_caller+0x1ec/0x370
ioremap on RAM at 0x0000000000000000 - 0x000000000001ffff
Handle an option ROM shadow copy as RAM, without trying to insert it into
the iomem resource tree.
This fixes a regression caused by 0c0e0736ac ("PCI: Set ROM shadow
location in arch code, not in PCI core"), which appeared in v4.6. The
regression causes video device initialization to fail. This was reported
on AMD Turks, but it likely affects others as well.
Fixes: 0c0e0736ac ("PCI: Set ROM shadow location in arch code, not in PCI core")
Reported-and-tested-by: Vecu Bosseur <vecu.bosseur@gmail.com>
Link: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1627496
Link: https://bugzilla.kernel.org/show_bug.cgi?id=175391
Link: https://bugzilla.redhat.com/show_bug.cgi?id=1352272
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v4.6+
IORESOURCE_PCI_FIXED means the resource can't be moved, so if it's set,
don't bother trying to assign or reassign the resource.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
* pci/aer:
PCI/AER: Clear error status registers during enumeration and restore
* pci/hotplug:
PCI: pciehp: Queue power work requests in dedicated function
* pci/misc:
PCI: Turn off Request Attributes to avoid Chelsio T5 Completion erratum
x86/PCI: Make pci_subsys_init() static
PCI: Add builtin_pci_driver() to avoid registration boilerplate
PCI: Remove unnecessary "if" statement
* pci/msi:
x86/PCI: Don't alloc pcibios-irq when MSI is enabled
PCI/MSI: Export all remapped MSIs to sysfs attributes
PCI: Disable MSI on SiS 761
* pci/resource:
sparc/PCI: Add mem64 resource parsing for root bus
PCI: Expand Enhanced Allocation BAR output
PCI: Make Enhanced Allocation bitmasks more obvious
PCI: Handle Enhanced Allocation capability for SR-IOV devices
PCI: Add support for Enhanced Allocation devices
PCI: Add Enhanced Allocation register entries
PCI: Handle IORESOURCE_PCI_FIXED when assigning resources
PCI: Handle IORESOURCE_PCI_FIXED when sizing resources
PCI: Clear IORESOURCE_UNSET when reverting to firmware-assigned address
* pci/virtualization:
PCI: Fix sriov_enable() error path for pcibios_enable_sriov() failures
PCI: Wait 1 second between disabling VFs and clearing NumVFs
PCI: Reorder pcibios_sriov_disable()
PCI: Remove VFs in reverse order if virtfn_add() fails
PCI: Remove redundant validation of SR-IOV offset/stride registers
PCI: Set SR-IOV NumVFs to zero after enumeration
PCI: Enable SR-IOV ARI Capable Hierarchy before reading TotalVFs
PCI: Don't try to restore VF BARs
If pci_assign_resource() fails to assign space for a BAR, we may restore
the BAR to whatever firmware left there at boot-time (this depends on
whether the arch implements pcibios_retrieve_fw_addr()). The messages we
print are not as useful as they could be:
pci 0000:00:01.0: BAR 15: assigned [mem 0xc0000000-0xc01fffff 64bit pref]
pci 0000:01:00.0: BAR 0: no space for [mem size 0x10000000 pref]
pci 0000:01:00.0: BAR 0: trying firmware assignment [mem size 0x10000000 pref]
pci 0000:01:00.0: BAR 0: [mem size 0x10000000 pref] conflicts with PCI Bus 0000:00 [mem 0xc0000000-0xffffffff window]
The last two lines should contain the actual BAR address, not the size.
Clear IORESOURCE_UNSET so we print the address. If requesting the
firmware-assigned resource fails, mark it IORESOURCE_UNSET again.
This is a cosmetic change to clarify the message: previously, if
pci_revert_fw_address() succeeded, pci_assign_resource() cleared
IORESOURCE_UNSET anyway, so this isn't really a functional change.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=85491#c50
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
VF BARs are read-only zero, so updating VF BARs will not have any effect.
See the SR-IOV spec r1.1, sec 3.4.1.11.
Don't update VF BARs in pci_restore_bars().
This avoids spurious "BAR %d: error updating" messages that we see when
doing vfio pass-through after 6eb7018705 ("vfio-pci: Move idle devices to
D3hot power state").
[bhelgaas: changelog, fix whitespace]
Signed-off-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
If a BAR is not inside any upstream bridge window, or if it conflicts with
another resource, mark it as IORESOURCE_UNSET so we don't try to use it.
We may be able to assign a different address for it.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Print messages about failures in pci_assign_resource(). We can drop the
"by-hand" message from _pci_assign_resource() because %pR now prints the
size rather than the address if the resource hasn't been assigned.
No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Previously we returned zero for success or 1 for failure. This changes
that so we return zero for success or a negative errno for failure.
No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Return errors immediately so the straightline path is the normal,
no-error path. No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
If we have space assigned to a resource, we try to expand the resource
(e.g., to accommodate SR-IOV resources), and the expansion attempt fails,
we should keep the original assignment.
After bd064f0a23 ("PCI: Mark resources as IORESOURCE_UNSET if we can't
assign them"), we left the resource marked IORESOURCE_UNSET when the
expansion failed, even if it had originally been set. That caused errors
like this:
pci 0003:00:00.0: can't enable device: BAR 15 [mem size 0x0c000000 64bit pref] not assigned
pci 0003:00:00.0: Error enabling bridge (-22), continuing
Fix this by restoring the original flags when reassignment fails.
[bhelgaas: reworked to simplify, changelog]
Fixes: bd064f0a23 ("PCI: Mark resources as IORESOURCE_UNSET if we can't assign them")
Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org # v3.15+
Merge quoted strings that are broken across lines into a single entity.
The compiler merges them anyway, but checkpatch complains about it, and
merging them makes it easier to grep for strings.
No functional change.
[bhelgaas: changelog, do the same for everything under drivers/pci]
Signed-off-by: Ryan Desfosses <ryan@desfo.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Move EXPORT_SYMBOL so it immediately follows the function or variable.
No functional change.
[bhelgaas: squash similar changes, fix hotplug, probe, rom, search, too]
Signed-off-by: Ryan Desfosses <ryan@desfo.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
* dma-api:
iommu/exynos: Remove unnecessary "&" from function pointers
DMA-API: Update dma_pool_create ()and dma_pool_alloc() descriptions
DMA-API: Fix duplicated word in DMA-API-HOWTO.txt
DMA-API: Capitalize "CPU" consistently
sh/PCI: Pass GAPSPCI_DMA_BASE CPU & bus address to dma_declare_coherent_memory()
DMA-API: Change dma_declare_coherent_memory() CPU address to phys_addr_t
DMA-API: Clarify physical/bus address distinction
* pci/virtualization:
PCI: Mark RTL8110SC INTx masking as broken
* pci/msi:
PCI/MSI: Remove pci_enable_msi_block()
* pci/misc:
PCI: Remove pcibios_add_platform_entries()
s390/pci: use pdev->dev.groups for attribute creation
PCI: Move Open Firmware devspec attribute to PCI common code
* pci/resource:
PCI: Add resource allocation comments
PCI: Simplify __pci_assign_resource() coding style
PCI: Change pbus_size_mem() return values to be more conventional
PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources
PCI: Support BAR sizes up to 8GB
resources: Clarify sanity check message
PCI: Don't add disabled subtractive decode bus resources
PCI: Don't print anything while decoding is disabled
PCI: Don't set BAR to zero if dma_addr_t is too small
PCI: Don't convert BAR address to resource if dma_addr_t is too small
PCI: Reject BAR above 4GB if dma_addr_t is too small
PCI: Fail safely if we can't handle BARs larger than 4GB
x86/gart: Tidy messages and add bridge device info
x86/gart: Replace printk() with pr_info()
x86/PCI: Move pcibios_assign_resources() annotation to definition
x86/PCI: Mark ATI SBx00 HPET BAR as IORESOURCE_PCI_FIXED
x86/PCI: Don't try to move IORESOURCE_PCI_FIXED resources
x86/PCI: Fix Broadcom CNB20LE unintended sign extension
Add comments in the code to match the allocation strategy of 7c671426dfc3
("PCI: Restrict 64-bit prefetchable bridge windows to 64-bit resources").
No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
If an allocation succeeds, we can return success immediately. Then we
don't have to test for success in the subsequent code.
No functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This patch changes the way we handle 64-bit prefetchable bridge windows to
make it more likely that we can assign space to all devices.
Previously we put all prefetchable resources in the prefetchable bridge
window. If any of those resources was 32-bit only, we restricted the
window to be below 4GB.
After this patch, we only put 64-bit prefetchable resources in a 64-bit
prefetchable window. We put all 32-bit prefetchable resources in the
non-prefetchable window, even if there are no 64-bit prefetchable
resources.
With the previous approach, if there was a 32-bit prefetchable resource
behind a bridge, we forced the bridge's prefetchable window below 4GB,
which meant that even if there was plenty of space above 4GB available, we
couldn't use it, and assignment of large 64-bit resources could fail, as
in the bugzilla below.
The new strategy is:
1) If the prefetchable window is 64 bits wide, we put only 64-bit
prefetchable resources in it. Any 32-bit prefetchable resources go in
the non-prefetchable window.
2) If the prefetchable window is 32 bits wide, we put both 32- and 64-bit
prefetchable resources in it.
3) If there is no prefetchable window, all MMIO resources go in the
non-prefetchable window.
This reduces performance for 32-bit prefetchable resources below a bridge
with a 64-bit prefetchable window. We previously assigned prefetchable
space, but now we'll assign non-prefetchable space. This is the case even
if there are no 64-bit prefetchable resources, or if they would all fit
below 4GB. In those cases, the old strategy would work and would have
better performance.
[bhelgaas: write changelog, add bugzilla link, fold in mem64_mask removal]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=74151
Tested-by: Guo Chao <yan@linux.vnet.ibm.com>
Tested-by: Wei Yang <weiyang@linux.vnet.ibm.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
None of these files are actually using any __init type directives and hence
don't need to include <linux/init.h>. Most are just a left over from
__devinit and __cpuinit removal, or simply due to code getting copied from
one driver to the next.
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Don't enable memory or I/O decoding if we haven't assigned or claimed the
BAR's resource.
If we enable decoding for a BAR that hasn't been assigned an address, we'll
likely cause bus conflicts. This declines to enable decoding for resources
with IORESOURCE_UNSET.
Note that drivers can use pci_enable_device_io() or pci_enable_device_mem()
if they only care about specific types of BARs. In that case, we don't
bother checking whether the corresponding resources are assigned or
claimed.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
If the IORESOURCE_UNSET bit is set, it means we haven't assigned an address
yet, so don't try to claim the region.
Also, make the error messages more uniform and add info about which BAR is
involved.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Check to make sure we don't update a BAR with an address we haven't
assigned.
If we haven't assigned an address to a resource, we shouldn't write it to a
BAR. This isn't a problem for the usual path via pci_assign_resource(),
which clears IORESOURCE_UNSET before calling pci_update_resource(), but
paths like pci_restore_bars() can call this for resources we haven't
assigned.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Clear IORESOURCE_UNSET when we assign an address to a resource, not when we
write the address to the BAR.
Also, drop the "BAR %d: set to %pR" message; this is mostly redundant with
the "BAR %d: assigned %pR" message from pci_assign_resource().
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
When assigning addresses to resources, mark them with IORESOURCE_UNSET
before we start and clear IORESOURCE_UNSET if assignment is successful.
That means that if we print the resource during assignment, we will show
the size, not a meaningless address.
Also, clear IORESOURCE_UNSET if we do assign an address, so we print the
address when it is valid.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
These interfaces:
pcibios_resource_to_bus(struct pci_dev *dev, *bus_region, *resource)
pcibios_bus_to_resource(struct pci_dev *dev, *resource, *bus_region)
took a pci_dev, but they really depend only on the pci_bus. And we want to
use them in resource allocation paths where we have the bus but not a
device, so this patch converts them to take the pci_bus instead of the
pci_dev:
pcibios_resource_to_bus(struct pci_bus *bus, *bus_region, *resource)
pcibios_bus_to_resource(struct pci_bus *bus, *resource, *bus_region)
In fact, with standard PCI-PCI bridges, they only depend on the host
bridge, because that's the only place address translation occurs, but
we aren't going that far yet.
[bhelgaas: changelog]
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Fix whitespace, capitalization, and spelling errors. No functional change.
I know "busses" is not an error, but "buses" was more common, so I used it
consistently.
Signed-off-by: Marta Rybczynska <rybczynska@gmail.com> (pci_reset_bridge_secondary_bus())
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reorder functions so __pci_assign_resource(), _pci_assign_resource(),
and pci_assign_resource() are closer together. No code change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
_pci_assign_resource() took an int "size" argument, which meant that
sizes larger than 4GB were truncated. Change type to resource_size_t.
[bhelgaas: changelog]
Signed-off-by: Nikhil P Rao <nikhil.rao@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
When we update 64-bit BARs, we have to perform two config writes. Between
the writes, the half-written BAR value could match a MEM access intended
for another device. This could result in corruption of this device (for
writes) or an unexpected response machine check (for reads).
To prevent this, disable MEM decoding while updating such BARs. This uses
the same safety test as 253d2e5498, which disables both MEM and IO while
sizing BARs, namely, we don't disable decoding for host bridge devices.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This isn't really a quirk; calling it directly from pci_add_device makes
more sense.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This allows us to move the definition of struct resource_list to
setup_bus.c and later convert resource_list to a regular list.
Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
