| Age | Commit message (Collapse) | Author | Files | Lines |
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* pci/virtualization:
PCI: Document reset method return values
PCI: Detach driver before procfs & sysfs teardown on device remove
PCI: Apply Cavium ThunderX ACS quirk to more Root Ports
PCI: Set Cavium ACS capability quirk flags to assert RR/CR/SV/UF
PCI: Restore ARI Capable Hierarchy before setting numVFs
PCI: Create SR-IOV virtfn/physfn links before attaching driver
PCI: Expose SR-IOV offset, stride, and VF device ID via sysfs
PCI: Cache the VF device ID in the SR-IOV structure
PCI: Add Kconfig PCI_IOV dependency for PCI_REALLOC_ENABLE_AUTO
PCI: Remove unused function __pci_reset_function()
PCI: Remove reset argument from pci_iov_{add,remove}_virtfn()
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* pci/switchtec:
switchtec: Make struct event_regs static
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* pci/resource:
PCI: Fail pci_map_rom() if the option ROM is invalid
PCI: Move pci_map_rom() error path
x86/PCI: Enable a 64bit BAR on AMD Family 15h (Models 00-1f, 30-3f, 60-7f)
PCI: Add pci_resize_resource() for resizing BARs
PCI: Add resizable BAR infrastructure
PCI: Add PCI resource type mask #define
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* pci/portdrv:
PCI/portdrv: Turn off PCIe services during shutdown
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* pci/msi:
PCI/portdrv: Compute MSI/MSI-X IRQ vectors after final allocation
PCI/portdrv: Factor out Interrupt Message Number lookup
PCI/portdrv: Consolidate comments
PCI/portdrv: Add #defines for AER and DPC Interrupt Message Number masks
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* pci/misc:
PCI: Fix kernel-doc build warning
PCI: Move PCI_QUIRKS to the PCI bus menu
alpha/PCI: Make pdev_save_srm_config() static
PCI: Remove unused declarations
PCI: Remove redundant pci_dev, pci_bus, resource declarations
PCI: Remove redundant pcibios_set_master() declarations
PCI/PME: Handle invalid data when reading Root Status
x86/pci/intel_mid_pci: Constify intel_mid_pci_ops and make it __initconst
PCI: Constify pci_dev_type structure
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* pci/hotplug:
PCI: pciehp: Do not clear Presence Detect Changed during initialization
PCI: pciehp: Fix race condition handling surprise link down
PCI: Distribute available resources to hotplug-capable bridges
PCI: Distribute available buses to hotplug-capable bridges
PCI: Do not allocate more buses than available in parent
PCI: Open-code the two pass loop when scanning bridges
PCI: Move pci_hp_add_bridge() to drivers/pci/probe.c
PCI: Add for_each_pci_bridge() helper
PCI: shpchp: Convert timers to use timer_setup()
PCI: cpqphp: Convert timers to use timer_setup()
PCI: pciehp: Convert timers to use timer_setup()
PCI: ibmphp: Use common error handling code in unconfigure_boot_device()
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* pci/endpoint:
misc: pci_endpoint_test: Fix BUG_ON error during pci_disable_msi()
misc: pci_endpoint_test: Fix pci_endpoint_test not releasing resources on remove
misc: pci_endpoint_test: Fix failure path return values in probe
misc: pci_endpoint_test: Avoid triggering a BUG()
misc: pci_endpoint_test: Prevent some integer overflows
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* pci/aspm:
PCI/ASPM: Add L1 Substates definitions
PCI/ASPM: Reformat ASPM register definitions
PCI/ASPM: Use correct capability pointer to program LTR_L1.2_THRESHOLD
PCI/ASPM: Account for downstream device's Port Common_Mode_Restore_Time
PCI/ASPM: Deal with missing root ports in link state handling
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* pci/aer:
PCI/AER: Report non-fatal errors only to the affected endpoint
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* pci/acpi:
ACPI / PCI: Bail early in acpi_pci_add_bus() if there is no ACPI handle
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Add and use #defines for L1 Substate register fields instead of hard-coding
the masks. Also update comments to use names from the spec. No functional
change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
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Reformat register field definitions in the style used elsewhere and align
comments with names used in the spec. No functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
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Previously we programmed the LTR_L1.2_THRESHOLD in the parent (upstream)
device using the capability pointer of the *child* (downstream) device,
which corrupted some random word of the parent's config space.
Use the parent's L1 SS capability pointer to program its
LTR_L1.2_THRESHOLD.
Fixes: aeda9adebab8 ("PCI/ASPM: Configure L1 substate settings")
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
CC: stable@vger.kernel.org # v4.11+
CC: Rajat Jain <rajatja@google.com>
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Every Port that supports the L1.2 substate advertises its Port
Common_Mode_Restore_Time, i.e., the time the Port requires to re-establish
common mode when exiting L1.2 (see PCIe r3.1, sec 7.33.2).
Per sec 5.5.3.3.1, when exiting L1.2, the Downstream Port (the device at
the upstream end of the link) must send TS1 training sequences for at least
T(COMMONMODE) after it detects electrical idle exit on the Link. We want
this to be long enough for both ends of the Link, so we should set it to
the maximum of the Port Common_Mode_Restore_Time for the upstream and
downstream components on the Link.
Previously we only looked at the Port Common_Mode_Restore_Time of the
upstream device, so if the downstream device required more time, we didn't
program the upstream device's T(COMMONMODE) correctly.
Fixes: f1f0366dd6be ("PCI/ASPM: Calculate and save the L1.2 timing parameters")
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Vidya Sagar <vidyas@nvidia.com>
Acked-by: Rajat Jain <rajatja@google.com>
CC: stable@vger.kernel.org # v4.11+
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Fix build error in kernel-doc notation:
../drivers/pci/pci.c:3479: ERROR: Unexpected indentation.
"::" tells the kernel-doc "reStructuredText" processor that the following
block is a literal block of some blob that should be kept as is.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
[bhelgaas: add hint about "::" meaning]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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If we detect a invalid PCI option ROM (e.g., invalid ROM header signature),
we should unmap it immediately and fail. It doesn't make any sense to
return a mapped area with size of 0.
I have seen this case on Intel GVTg vGPU, which has no VBIOS. It will not
cause a real problem, but we should skip it as early as possible.
Signed-off-by: Changbin Du <changbin.du@intel.com>
[bhelgaas: split non-functional change into separate patch]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Move pci_map_rom() error code to the end to prepare for adding another
error path. No functional change intended.
Signed-off-by: Changbin Du <changbin.du@intel.com>
[bhelgaas: split non-functional change into separate patch]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Localize PCI_QUIRKS in the PCI bus menu.
Move PCI_QUIRKS to the PCI bus menu instead of the (often broken) General
Setup EXPERT menu. The prompt still depends on EXPERT.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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pdev_save_srm_config() and struct pdev_srm_saved_conf are only used in
arch/alpha/kernel/pci.c, so make them static there.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
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Remove these unused declarations:
pcibios_config_init() # never defined anywhere
pcibios_scan_root() # only defined by x86
pcibios_get_irq_routing_table() # only defined by x86
pcibios_set_irq_routing() # only defined by x86
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
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<linux/pci.h> defines struct pci_bus and struct pci_dev and includes the
struct resource definition before including <asm/pci.h>. Nobody includes
<asm/pci.h> directly, so they don't need their own declarations.
Remove the redundant struct pci_dev, pci_bus, resource declarations.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> # CRIS
Acked-by: Ralf Baechle <ralf@linux-mips.org> # MIPS
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All users of pcibios_set_master() include <linux/pci.h>, which already has
a declaration. Remove the unnecessary declarations from the <asm/pci.h>
files.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> # CRIS
Acked-by: Ralf Baechle <ralf@linux-mips.org> # MIPS
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PCIe PME and native hotplug share the same interrupt number, so hotplug
interrupts are also processed by PME. In some cases, e.g., a Link Down
interrupt, a device may be present but unreachable, so when we try to
read its Root Status register, the read fails and we get all ones data
(0xffffffff).
Previously, we interpreted that data as PCI_EXP_RTSTA_PME being set, i.e.,
"some device has asserted PME," so we scheduled pcie_pme_work_fn(). This
caused an infinite loop because pcie_pme_work_fn() tried to handle PME
requests until PCI_EXP_RTSTA_PME is cleared, but with the link down,
PCI_EXP_RTSTA_PME can't be cleared.
Check for the invalid 0xffffffff data everywhere we read the Root Status
register.
1469d17dd341 ("PCI: pciehp: Handle invalid data when reading from
non-existent devices") added similar checks in the hotplug driver.
Signed-off-by: Qiang Zheng <zhengqiang10@huawei.com>
[bhelgaas: changelog, also check in pcie_pme_work_fn(), use "~0" to follow
other similar checks]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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It is possible that the hotplug event has already happened before the
driver is attached to a PCIe hotplug downstream port. If we just clear the
status we never get the hotplug interrupt and thus the event will be
missed.
To make sure that does not happen, we leave Presence Detect Changed bit
untouched during initialization. Then once the event is unmasked we get an
interrupt and handle the hotplug event properly.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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A surprise link down may retrain very quickly causing the same slot
generate a link up event before handling the link down event completes.
Since the link is active, the power off work queued from the first link
down will cause a second down event when power is disabled. However, the
link up event sets the slot state to POWERON_STATE before the event to
handle this is enqueued, making the second down event believe it needs to
do something.
This creates constant link up and down event cycle.
To prevent this it is better to handle each event at the time in order it
occurred, so change the driver to use ordered workqueue instead.
A normal device hotplug triggers two events (presense detect and link up)
that are already handled properly in the driver but we currently log an
error if we find an existing device in the slot. Since this is not an error
change the log level to be debug instead to avoid scaring users.
This is based on the original work by Ashok Raj.
Link: https://patchwork.kernel.org/patch/9469023
Suggested-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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The same problem that we have with bus space applies to other resources
as well. Linux only allocates the minimal amount of resources so that
the devices currently present barely fit there. This prevents extending
the chain later on because the resource windows allocated for hotplug
downstream ports are too small.
Follow what we already did for bus number and assign all available extra
resources to hotplug-capable bridges. This makes it possible to extend the
hierarchy later.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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System BIOS sometimes allocates extra bus space for hotplug-capable PCIe
root/downstream ports. This space is needed if the device plugged to the
port will have more hotplug-capable downstream ports. A good example of
this is Thunderbolt. Each Thunderbolt device contains a PCIe switch and
one or more hotplug-capable PCIe downstream ports where the daisy chain
can be extended.
Currently Linux only allocates minimal bus space to make sure all the
enumerated devices barely fit there. The BIOS reserved extra space is
not taken into consideration at all. Because of this we run out of bus
space pretty quickly when more PCIe devices are attached to hotplug
downstream ports in order to extend the chain.
Modify the PCI core so we distribute the available BIOS allocated bus space
equally between hotplug-capable bridges to make sure there is enough bus
space for extending the hierarchy later on.
Update kernel docs of the affected functions.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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One can ask more buses to be reserved for hotplug bridges by passing
pci=hpbussize=N in the kernel command line. If the parent bus does not
have enough bus space available we incorrectly create child bus with the
requested number of subordinate buses.
In the example below hpbussize is set to one more than we have available
buses in the root port:
pci 0000:07:00.0: [8086:1578] type 01 class 0x060400
pci 0000:07:00.0: scanning [bus 00-00] behind bridge, pass 0
pci 0000:07:00.0: bridge configuration invalid ([bus 00-00]), reconfiguring
pci 0000:07:00.0: scanning [bus 00-00] behind bridge, pass 1
pci_bus 0000:08: busn_res: can not insert [bus 08-ff] under [bus 07-3f] (conflicts with (null) [bus 07-3f])
pci_bus 0000:08: scanning bus
...
pci_bus 0000:0a: bus scan returning with max=40
pci_bus 0000:0a: busn_res: [bus 0a-ff] end is updated to 40
pci_bus 0000:0a: [bus 0a-40] partially hidden behind bridge 0000:07 [bus 07-3f]
pci_bus 0000:08: bus scan returning with max=40
pci_bus 0000:08: busn_res: [bus 08-ff] end is updated to 40
Instead of allowing this, limit the subordinate number to be less than or
equal the maximum subordinate number allocated for the parent bus (if it
has any).
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[bhelgaas: remove irrelevant dmesg messages]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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The current scanning code is really hard to understand because it calls
the same function in a loop where pass value is changed without any
comments explaining it:
for (pass = 0; pass < 2; pass++)
for_each_pci_bridge(dev, bus)
max = pci_scan_bridge(bus, dev, max, pass);
Unfamiliar reader cannot tell easily what is the purpose of this loop
without looking at internals of pci_scan_bridge().
In order to make this bit easier to understand, open-code the loop in
pci_scan_child_bus() and pci_hp_add_bridge() with added comments.
No functional changes intended.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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There is not much point of having a file with a single function in it.
Instead we can just move pci_hp_add_bridge() to drivers/pci/probe.c and
make it available always when PCI core is enabled.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[bhelgaas: convert printk to dev_err()]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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The following pattern is often used:
list_for_each_entry(dev, &bus->devices, bus_list) {
if (pci_is_bridge(dev)) {
...
}
}
Add a for_each_pci_bridge() helper to make that code easier to write and
read by reducing indentation level. It also saves one or few lines of code
in each occurrence.
Convert PCI core parts here at the same time.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[bhelgaas: fold in http://lkml.kernel.org/r/20171013165352.25550-1-andriy.shevchenko@linux.intel.com]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Arvind Yadav <arvind.yadav.cs@gmail.com>
Cc: Quentin Lambert <lambert.quentin@gmail.com>
Cc: Aleksandr Bezzubikov <zuban32s@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel@redhat.com>
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In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. This has the result of fixing
pushbutton_helper_thread(), which was truncating the event pointer to 32
bits.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Arvind Yadav <arvind.yadav.cs@gmail.com>
Cc: Quentin Lambert <lambert.quentin@gmail.com>
Cc: Aleksandr Bezzubikov <zuban32s@gmail.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel@redhat.com>
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In preparation for unconditionally passing the struct timer_list pointer to
all timer callbacks, switch to using the new timer_setup() and from_timer()
to pass the timer pointer explicitly. This fixes what appears to be a bug
in passing the wrong pointer to the timer handler (address of ctrl pointer
instead of ctrl pointer).
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Mayurkumar Patel <mayurkumar.patel@intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
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Combine two error paths that emit the same message and return the same
error code.
This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Some of the PCIe services such as AER are being left enabled during
shutdown. This might cause spurious AER errors while SOC is being powered
down.
Clean up the PCIe services gracefully during shutdown to clear these false
positives.
Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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pci_disable_msi() throws a Kernel BUG if the driver has successfully
requested an IRQ and not released it. Fix it here by freeing IRQs before
invoking pci_disable_msi().
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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sscanf(misc_device->name, DRV_MODULE_NAME ".%d", &id) in
pci_endpoint_test_remove() returns 0, which results in returning early
without releasing the resources. This is as a result of misc_device not
having a valid name. Fix it here.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Return value of pci_endpoint_test_probe is not set properly in a couple of
failure cases. Fix it here.
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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If you call ida_simple_remove(&pci_endpoint_test_ida, id) with a negative
"id" then it triggers an immediate BUG_ON(). Let's not allow that.
Fixes: 2c156ac71c6b ("misc: Add host side PCI driver for PCI test function device")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
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The pci_reset_function() path may try several different reset methods:
device-specific resets, PCIe Function Level Resets, PCI Advanced Features
Function Level Reset, etc.
Add a comment about what the return values from these methods mean. If one
of the methods fails, in some cases we want to continue and try the next
one in the list, but sometimes we want to stop trying.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Manually enable a 64GB 64-bit BAR so we have enough room for graphics
devices with large framebuffers.
Most BIOSes don't enable this for compatibility reasons.
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>
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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>
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When removing a device, for example a VF being removed due to SR-IOV
teardown, a "soft" hot-unplug via 'echo 1 > remove' in sysfs, or an actual
hot-unplug, we first remove the procfs and sysfs attributes for the device
before attempting to release the device from any driver bound to it.
Unbinding the driver from the device can take time. The device might need
to write out data or it might be actively in use. If it's in use by
userspace through a vfio driver, the unbind might block until the user
releases the device. This leads to a potentially non-trivial amount of
time where the device exists, but we've torn down the interfaces that
userspace uses to examine devices, for instance lspci might generate this
sort of error:
pcilib: Cannot open /sys/bus/pci/devices/0000:01:0a.3/config
lspci: Unable to read the standard configuration space header of device 0000:01:0a.3
We don't seem to have any dependence on this teardown ordering in the
kernel, so let's unbind the driver first, which is also more symmetric with
the instantiation of the device in pci_bus_add_device().
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Add resizable BAR infrastructure, including defines and helper functions to
read the possible sizes of a BAR and update its size. See PCIe r3.1, sec
7.22.
Link: https://pcisig.com/sites/default/files/specification_documents/ECN_Resizable-BAR_24Apr2008.pdf
Signed-off-by: Christian König <christian.koenig@amd.com>
[bhelgaas: rename to functions with "rebar" (to match #defines), drop shift
#defines, drop "_MASK" suffixes, fix typos, fix kerneldoc]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
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Add a #define for the PCI resource type mask. We use this mask multiple
times in the bus setup.
Signed-off-by: Christian König <christian.koenig@amd.com>
[bhelgaas: move to setup-bus.c]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
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When setting up portdrv MSI/MSI-X interrupts, we previously allocated the
maximum possible number of vectors, read the Interrupt Message Numbers for
each service, saved the IRQ for each, freed the vectors, and finally used
the largest Message Number to reallocate only as many vectors as we need.
The problem is that freeing the vectors invalidates their IRQs, so the
saved IRQ numbers may now be invalid, which can result in errors like
this:
pcie_pme: probe of 0000:00:00.0:pcie001 failed with error -22
pciehp 0000:00:00.0:pcie004: Cannot get irq 20 for the hotplug controller
aer: probe of 0000:00:00.0:pcie002 failed with error -22
dpc 0000:00:00.0:pcie010: request IRQ22 failed: -22
Change the setup so we save the Interrupt Message Numbers (not the IRQs)
before we free the original setup, then use the Message Numbers to compute
the IRQs (via pci_irq_vector()) *after* we reallocate the vectors.
This should always be safe for MSI-X because the Message Numbers are fixed.
For MSI, the hardware is allowed to change Message Numbers when we update
the MSI Multiple Message Enable field when reallocating the vectors, but
since we allocate enough vectors to accommodate the largest Message Number
we found, that's unlikely. See PCIe r3.1, sec 7.8.2, 7.10.10, 7.31.2.
Fixes: 3674cc49da9a ("PCI/portdrv: Use pci_irq_alloc_vectors()")
Based-on-patch-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com> # HiSilicon hip08
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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Factor out Interrupt Message Number lookup from the MSI/MSI-X interrupt
setup. One side effect is that we only have to check once to see if we
have enough vectors for all the services. No functional change intended.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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Consolidate some repetitive comments so we can see the code better. No
functional change.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
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