Commit Graph

664 Commits

Author SHA1 Message Date
Lukas Wunner 0fa635aec9 PCI/LINK: Deduplicate bandwidth reports for multi-function devices
If a multi-function device's bandwidth is already limited when it is
enumerated, a message is logged only for function 0.  By contrast, when
downtraining occurs after enumeration, a message is logged for all
functions.  That's because the former uses pcie_report_downtraining(),
whereas the latter uses __pcie_print_link_status() (which doesn't filter
functions != 0).  I am seeing this happen on a MacBookPro9,1 with a GPU
(function 0) and an integrated HDA controller (function 1).

Avoid this incongruence by calling pcie_report_downtraining() in both
cases.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alexandru Gagniuc <alex.gagniuc@dellteam.com>
2019-03-25 17:59:07 -05:00
Lukas Wunner 55397ce8df PCI/LINK: Clear bandwidth notification interrupt before enabling it
When booting a MacBookPro9,1, duplicate link downtraining messages are
logged for the devices directly attached to the two CPU-internal Root Ports
of the Core i7 3615QM:  Once on device enumeration and once on enablement
of the bandwidth notification interrupt on the Root Ports.

Duplicate messages do not occur with Root Ports on the PCH and Downstream
Ports on the Thunderbolt controller:  Only a single message is logged for
these, namely on device enumeration.

The reason for the duplicate messages is a stale interrupt in the Link
Status register of the 3615QM's internal Root Ports.  Avoid by clearing the
interrupt before enabling it.

An alternative approach would be to clear the interrupt already on device
enumeration or to report link downtraining only if the speed has changed.
That way, link downtraining occurring between device enumeration and
enablement of the bandwidth notification interrupt could be caught.
However clearing stale interrupts before enabling them is a standard
operating procedure for any driver and keeping the two steps in one place
makes the code easier to follow.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alexandru Gagniuc <alex.gagniuc@dellteam.com>
2019-03-25 17:59:06 -05:00
Alexandru Gagniuc 3e82a7f903 PCI/LINK: Supply IRQ handler so level-triggered IRQs are acked
A threaded IRQ with a NULL handler does not work with level-triggered
interrupts.  request_threaded_irq() will return an error:

  genirq: Threaded irq requested with handler=NULL and !ONESHOT for irq 16
  pcie_bw_notification: probe of 0000:00:1b.0:pcie010 failed with error -22

For level interrupts we need to silence the interrupt before exiting the
IRQ handler, so just clear the PCI_EXP_LNKSTA_LBMS bit there.

Fixes: e8303bb7a7 ("PCI/LINK: Report degraded links via link bandwidth notification")
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Reported-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2019-03-25 17:58:50 -05:00
Bjorn Helgaas 7733f69288 Merge branch 'pci/pm'
- Blacklist Gigabyte X299 Root Port power management to fix Thunderbolt
    hotplug (Mika Westerberg)

  - Revert runtime PM suspend/resume callbacks that broke PME on network
    cable plug (Mika Westerberg)

  - Disable Data Link State Changed interrupts to prevent wakeup
    immediately after suspend (Mika Westerberg)

* pci/pm:
  PCI/PME: Fix possible use-after-free on remove
  PCI/PME: Fix hotplug/sysfs remove deadlock in pcie_pme_remove()
  PCI: pciehp: Disable Data Link Layer State Changed event on suspend
  Revert "PCI/PME: Implement runtime PM callbacks"
  PCI: Blacklist power management of Gigabyte X299 DESIGNARE EX PCIe ports
2019-03-06 15:30:15 -06:00
Bjorn Helgaas 9c926ec785 Merge branch 'pci/portdrv'
- Allow portdrv to claim subtractive decode Ports so PCIe services will
    work for them (Honghui Zhang)

  - Report PCIe links that become degraded at run-time (Alexandru Gagniuc)

* pci/portdrv:
  PCI/LINK: Report degraded links via link bandwidth notification
  PCI/portdrv: Support PCIe services on subtractive decode bridges
  PCI/portdrv: Use conventional Device ID table formatting
2019-03-06 15:30:14 -06:00
Bjorn Helgaas 6d940a71c9 Merge branch 'pci/misc'
- Mark expected switch fall-through (Mathieu Malaterre)

  - Use of_node_name_eq() for node name comparisons (Rob Herring)

  - Add ACS and pciehp quirks for HXT SD4800 (Shunyong Yang)

  - Consolidate Rohm Vendor ID definitions (Andy Shevchenko)

  - Use u32 (not __u32) for things not exposed to userspace (Logan
    Gunthorpe)

  - Fix locking semantics of bus and slot reset interfaces (Alex
    Williamson)

  - Update PCIEPORTBUS Kconfig help text (Hou Zhiqiang)

* pci/misc:
  PCI: Update PCIEPORTBUS Kconfig help text
  PCI: Fix "try" semantics of bus and slot reset
  PCI: Clean up usage of __u32 type
  genirq/msi: Clean up usage of __u8/__u16 types
  PCI: Move Rohm Vendor ID to generic list
  PCI: pciehp: Add HXT quirk for Command Completed errata
  PCI: Add ACS quirk for HXT SD4800
  PCI: Add HXT vendor ID
  PCI: Use of_node_name_eq() for node name comparisons
  PCI: Mark expected switch fall-through
2019-03-06 15:30:13 -06:00
Bjorn Helgaas 1bd2e9ee5c Merge branch 'pci/dpc'
- Fix DPC use of uninitialized data (Dongdong Liu)

* pci/dpc:
  PCI/DPC: Fix print AER status in DPC event handling
2019-03-06 15:30:10 -06:00
Hou Zhiqiang 8f55ed3f55 PCI: Update PCIEPORTBUS Kconfig help text
The Virtual Channel service has been removed and Downstream Port
Containment has been added, so update the symbol description to be
consistent with the current code.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2019-03-06 15:00:09 -06:00
Alexandru Gagniuc e8303bb7a7 PCI/LINK: Report degraded links via link bandwidth notification
A warning is generated when a PCIe device is probed with a degraded link,
but there was no similar mechanism to warn when the link becomes degraded
after probing.  The Link Bandwidth Notification provides this mechanism.

Use the Link Bandwidth Management Interrupt to detect bandwidth changes,
and rescan the bandwidth, looking for the weakest point.  This is the same
logic used in probe().

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
2019-03-05 15:04:13 -06:00
Sven Van Asbroeck 7cf58b79b3 PCI/PME: Fix possible use-after-free on remove
In remove(), ensure that the PME work cannot run after kfree() is called.
Otherwise, this could result in a use-after-free.

This issue was detected with the help of Coccinelle.

Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Sinan Kaya <okaya@kernel.org>
Cc: Frederick Lawler <fred@fredlawl.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2019-03-01 17:45:27 -06:00
Rafael J. Wysocki 95c80bc695 PCI/PME: Fix hotplug/sysfs remove deadlock in pcie_pme_remove()
Dongdong reported a deadlock triggered by a hotplug event during a sysfs
"remove" operation:

  pciehp 0000:00:0c.0:pcie004: Slot(0-1): Link Up
  # echo 1 > 0000:00:0c.0/remove

  PME and hotplug share an MSI/MSI-X vector.  The sysfs "remove" side is:

    remove_store
       pci_stop_and_remove_bus_device_locked
	 pci_lock_rescan_remove
	 pci_stop_and_remove_bus_device
	   ...
	   pcie_pme_remove
	     pcie_pme_suspend
	       synchronize_irq        # wait for hotplug IRQ handler
	 pci_unlock_rescan_remove

  The hotplug side is:

    pciehp_ist
       pciehp_handle_presence_or_link_change
	 pciehp_configure_device
	   pci_lock_rescan_remove     # wait for pci_unlock_rescan_remove()

  INFO: task bash:10913 blocked for more than 120 seconds.

  # ps -ax |grep D
   PID TTY      STAT   TIME COMMAND
  10913 ttyAMA0  Ds+    0:00 -bash
  14022 ?        D      0:00 [irq/745-pciehp]

  # cat /proc/14022/stack
  __switch_to+0x94/0xd8
  pci_lock_rescan_remove+0x20/0x28
  pciehp_configure_device+0x30/0x140
  pciehp_handle_presence_or_link_change+0x324/0x458
  pciehp_ist+0x1dc/0x1e0

  # cat /proc/10913/stack
  __switch_to+0x94/0xd8
  synchronize_irq+0x8c/0xc0
  pcie_pme_suspend+0xa4/0x118
  pcie_pme_remove+0x20/0x40
  pcie_port_remove_service+0x3c/0x58
  ...
  pcie_port_device_remove+0x2c/0x48
  pcie_portdrv_remove+0x68/0x78
  pci_device_remove+0x48/0x120
  ...
  pci_stop_bus_device+0x84/0xc0
  pci_stop_and_remove_bus_device_locked+0x24/0x40
  remove_store+0xa4/0xb8
  dev_attr_store+0x44/0x60
  sysfs_kf_write+0x58/0x80

It is incorrect to call pcie_pme_suspend() from pcie_pme_remove() for two
reasons.

First, pcie_pme_suspend() calls synchronize_irq(), which will wait for the
native hotplug interrupt handler as well as for the PME one, because they
share one IRQ (as per the spec).  That may deadlock if hotplug is signaled
while pcie_pme_remove() is running and the latter calls
pci_lock_rescan_remove() before the former.

Second, if pcie_pme_suspend() figures out that wakeup needs to be enabled
for the port, it will return without disabling the interrupt as expected by
pcie_pme_remove() which was overlooked by commit c7b5a4e6e8 ("PCI / PM:
Fix native PME handling during system suspend/resume").

To fix that, rework pcie_pme_remove() to disable the PME interrupt, clear
its status and prevent the PME worker function from re-enabling it before
calling free_irq() on it, which should be sufficient.

Fixes: c7b5a4e6e8 ("PCI / PM: Fix native PME handling during system suspend/resume")
Link: https://lore.kernel.org/linux-pci/c7697e7c-e1af-13e4-8491-0a3996e6ab5d@huawei.com
Reported-by: Dongdong Liu <liudongdong3@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[bhelgaas: add URL and deadlock details from Dongdong]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2019-02-28 13:56:27 -06:00
Dongdong Liu 9f08a5d896 PCI/DPC: Fix print AER status in DPC event handling
Previously dpc_handler() called aer_get_device_error_info() without
initializing info->severity, so aer_get_device_error_info() relied on
uninitialized data.

Add dpc_get_aer_uncorrect_severity() to read the port's AER status, mask,
and severity registers and set info->severity.

Also, clear the port's AER fatal error status bits.

Fixes: 8aefa9b0d9 ("PCI/DPC: Print AER status in DPC event handling")
Signed-off-by: Dongdong Liu <liudongdong3@huawei.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Cc: stable@vger.kernel.org	# v4.19+
2019-02-21 17:07:20 -06:00
Honghui Zhang f0cfecea8d PCI/portdrv: Support PCIe services on subtractive decode bridges
The Class Code for subtractive decode PCI-to-PCI bridge is 060401h; add an
entry to make portdrv support this type of bridge.  This allows use of PCIe
services on subtractive decode ports.

Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
[bhelgaas: add braces surrounding entry]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2019-02-15 13:58:20 -06:00
Bjorn Helgaas c89f7f98c9 PCI/portdrv: Use conventional Device ID table formatting
The pci_device_id table was technically correct, but unusually formatted,
which made adding entries error-prone.  Change the format so it's obvious
how to add entries.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2019-02-15 13:49:18 -06:00
Mika Westerberg c528f7bd36 Revert "PCI/PME: Implement runtime PM callbacks"
This reverts commit 0e157e5286.

Heiner reported that the commit in question prevents his network adapter
from triggering PME and waking up when network cable is plugged.

The commit tried to prevent root port waking up from D3cold immediately but
looks like disabing root port PME interrupt is not the right way to fix
that issue so revert it now.  The patch following proposes an alternative
solution to that issue.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=202103
Fixes: 0e157e5286 ("PCI/PME: Implement runtime PM callbacks")
Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
Tested-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
CC: stable@vger.kernel.org	# v4.20+
2019-02-14 14:40:40 -06:00
Andy Shevchenko 807ffb1e1e PCI/AER: Use match_string() helper to simplify the code
match_string() returns the array index of a matching string.  Use it
instead of the open-coded implementation.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2019-01-29 16:32:17 -06:00
Linus Torvalds 926b02d3eb pci-v4.21-changes
-----BEGIN PGP SIGNATURE-----
 
 iQJIBAABCgAyFiEEgMe7l+5h9hnxdsnuWYigwDrT+vwFAlwtMCIUHGJoZWxnYWFz
 QGdvb2dsZS5jb20ACgkQWYigwDrT+vwQUQ/+P5/VDpo4abjudGO2c7FU1bJOwvfN
 cfV5dvDCw0kpx0Em5SmnpAD7Punllxxvb/04K75lqarGyx/Txqaw+lbIF+qSj6my
 GsQ16Iy8T48x5hr+Pf6vTh1eE+NaAVZfOPDOt7CyTNAgwfzHeVNyfNvz7pfKTIIJ
 Mk/jRE4kkeWo60jsY5p3sFo3OVOxBOsRdN+2sruaQuWFXrKHLyNDR+7Z9ZPxubFk
 cCO/TYPhNXmmKhCAR4V/rGiqz9OL2wyFixGhGhmD3tnC9nAb/wTMzjARsyBopBPi
 b/KkR2eLFEyXN0HJrwqxiURo4J3nveAYEuNXH5KjRBQZnoBCGSCIlqFhlrp9vdBk
 B4KIdT8h/M6LsVGeVSEIxIEXCp67YE31kxraFrk4Vsggdh2TFQ0llh1sajj8IFJB
 XekutedAOlTSOaM1/jvVPUJYg04X90bp3uXn3IU45XlQ8nBOG3immFVITRLkvd3w
 ywH+SEdeZAhWl3RGy8SHhqdeCJ7nNQbcRaRJ5CoWJBDNJTBGF1X+zJD2Swi6H9vA
 nWGNRlb3CPPIMPF127nADnOE7Cj2FlpAEIEu52HpcpIrhEdrGvLkGeQfgdWBjbyU
 aHwC04bLWnvsA9SEFVnuMIBaFQmJ1RuaWAHdtscyyO2uoeCtN8Aa+BX6jXFbVZQN
 9eFzpiv0kUiXlAQ=
 =g1ia
 -----END PGP SIGNATURE-----

Merge tag 'pci-v4.21-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci

Pull PCI updates from Bjorn Helgaas:

 - Remove unused lists from ASPM pcie_link_state (Frederick Lawler)

 - Fix Broadcom CNB20LE host bridge unintended sign extension (Colin Ian
   King)

 - Expand Kconfig "PF" acronyms (Randy Dunlap)

 - Update MAINTAINERS for arch/x86/kernel/early-quirks.c (Bjorn Helgaas)

 - Add missing include to drivers/pci.h (Alexandru Gagniuc)

 - Override Synopsys USB 3.x HAPS device class so dwc3-haps can claim it
   instead of xhci (Thinh Nguyen)

 - Clean up P2PDMA documentation (Randy Dunlap)

 - Allow runtime PM even if driver doesn't supply callbacks (Jarkko
   Nikula)

 - Remove status check after submitting Switchtec MRPC Firmware Download
   commands to avoid Completion Timeouts (Kelvin Cao)

 - Set Switchtec coherent DMA mask to allow 64-bit DMA (Boris Glimcher)

 - Fix Switchtec SWITCHTEC_IOCTL_EVENT_IDX_ALL flag overwrite issue
   (Joey Zhang)

 - Enable write combining for Switchtec MRPC Input buffers (Kelvin Cao)

 - Add Switchtec MRPC DMA mode support (Wesley Sheng)

 - Skip VF scanning on powerpc, which does this in firmware (Sebastian
   Ott)

 - Add Amlogic Meson PCIe controller driver and DT bindings (Yue Wang)

 - Constify histb dw_pcie_host_ops structure (Julia Lawall)

 - Support multiple power domains for imx6 (Leonard Crestez)

 - Constify layerscape driver data (Stefan Agner)

 - Update imx6 Kconfig to allow imx6 PCIe in imx7 kernel (Trent Piepho)

 - Support armada8k GPIO reset (Baruch Siach)

 - Support suspend/resume support on imx6 (Leonard Crestez)

 - Don't hard-code DesignWare DBI/ATU offst (Stephen Warren)

 - Skip i.MX6 PHY setup on i.MX7D (Andrey Smirnov)

 - Remove Jianguo Sun from HiSilicon STB maintainers (Lorenzo Pieralisi)

 - Mask DesignWare interrupts instead of disabling them to avoid lost
   interrupts (Marc Zyngier)

 - Add locking when acking DesignWare interrupts (Marc Zyngier)

 - Ack DesignWare interrupts in the proper callbacks (Marc Zyngier)

 - Use devm resource parser in mediatek (Honghui Zhang)

 - Remove unused mediatek "num-lanes" DT property (Honghui Zhang)

 - Add UniPhier PCIe controller driver and DT bindings (Kunihiko
   Hayashi)

 - Enable MSI for imx6 downstream components (Richard Zhu)

* tag 'pci-v4.21-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: (40 commits)
  PCI: imx: Enable MSI from downstream components
  s390/pci: skip VF scanning
  PCI/IOV: Add flag so platforms can skip VF scanning
  PCI/IOV: Factor out sriov_add_vfs()
  PCI: uniphier: Add UniPhier PCIe host controller support
  dt-bindings: PCI: Add UniPhier PCIe host controller description
  PCI: amlogic: Add the Amlogic Meson PCIe controller driver
  dt-bindings: PCI: meson: add DT bindings for Amlogic Meson PCIe controller
  arm64: dts: mt7622: Remove un-used property for PCIe
  arm: dts: mt7623: Remove un-used property for PCIe
  dt-bindings: PCI: MediaTek: Remove un-used property
  PCI: mediatek: Remove un-used variant in struct mtk_pcie_port
  MAINTAINERS: Remove Jianguo Sun from HiSilicon STB DWC entry
  PCI: dwc: Don't hard-code DBI/ATU offset
  PCI: imx: Add imx6sx suspend/resume support
  PCI: armada8k: Add support for gpio controlled reset signal
  PCI: dwc: Adjust Kconfig to allow IMX6 PCIe host on IMX7
  PCI: dwc: layerscape: Constify driver data
  PCI: imx: Add multi-pd support
  PCI: Override Synopsys USB 3.x HAPS device class
  ...
2019-01-05 17:57:34 -08:00
Bjorn Helgaas e6397dfcb5 Merge branch 'pci/misc'
- Expand Kconfig "PF" acronyms (Randy Dunlap)

  - Update MAINTAINERS for arch/x86/kernel/early-quirks.c (Bjorn Helgaas)

  - Add missing include to drivers/pci.h (Alexandru Gagniuc)

  - Override Synopsys USB 3.x HAPS device class so dwc3-haps can claim it
    instead of xhci (Thinh Nguyen)

* pci/misc:
  PCI: Override Synopsys USB 3.x HAPS device class
  PCI: Move Synopsys HAPS platform device IDs
  PCI: Add missing include to drivers/pci.h
  PCI: Remove unnecessary space before function pointer arguments
  MAINTAINERS: Add x86 early-quirks.c file pattern to PCI subsystem
  PCI: Expand the "PF" acronym in Kconfig help text
2019-01-02 15:31:03 -06:00
Frederick Lawler 3c259a1c36 PCI/ASPM: Remove unused lists from struct pcie_link_state
ASPM does not make use of the children or link LIST_HEADs declared in
struct pcie_link_state and defined in alloc_pcie_link_state().  Therefore,
remove these lists.

No functional change intended.

Signed-off-by: Frederick Lawler <fred@fredlawl.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-12-17 14:30:31 -06:00
Yanjiang Jin 1063a5148a PCI/AER: Queue one GHES event, not several uninitialized ones
ecae65e133 ("PCI/AER: Use kfifo_in_spinlocked() to insert locked
elements") replaced kfifo_put() with kfifo_in_spinlocked(), but passed the
*size* of the queue entry, where kfifo_in_spinlocked() expects the *number*
of entries to be copied.

We want to insert only one element into kfifo, not "sizeof(entry) = 16".
Without this patch, we would get 15 uninitialized elements.

Fixes: ecae65e133 ("PCI/AER: Use kfifo_in_spinlocked() to insert locked elements")
Signed-off-by: Yanjiang Jin <yanjiang.jin@hxt-semitech.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
2018-12-14 11:29:37 -06:00
Benjamin Young 7cb3026411 PCI: Remove unnecessary space before function pointer arguments
Make spacing more consistent in the code for function pointer declarations
based on checkpatch.pl.

Signed-off-by: Benjamin Young <youngcdev@gmail.com>
[bhelgaas: make similar changes in include/linux/pci.h]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-12-06 14:39:31 -06:00
Bjorn Helgaas b07b864ee4 Revert "PCI/ASPM: Do not initialize link state when aspm_disabled is set"
This reverts commit 17c9148736.

Rafael found that this commit broke the SD card reader in his
Acer Aspire S5.  Details of the problem are in the bugzilla below.

Fixes: 17c9148736 ("PCI/ASPM: Do not initialize link state when aspm_disabled is set")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=201801
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-12-03 18:05:17 -06:00
Bjorn Helgaas ee8360fdaf Merge branch 'pci/misc'
- Remove unused Netronome NFP32xx Device IDs (Jakub Kicinski)

  - Use bitmap_zalloc() for dma_alias_mask (Andy Shevchenko)

  - Add switch fall-through annotations (Gustavo A. R. Silva)

  - Remove unused Switchtec quirk variable (Joshua Abraham)

  - Fix pci.c kernel-doc warning (Randy Dunlap)

  - Remove trivial PCI wrappers for DMA APIs (Christoph Hellwig)

  - Add Intel GPU device IDs to spurious interrupt quirk (Bin Meng)

  - Run Switchtec DMA aliasing quirk only on NTB endpoints to avoid useless
    dmesg errors (Logan Gunthorpe)

  - Update Switchtec NTB documentation (Wesley Yung)

  - Remove redundant "default n" from Kconfig (Bartlomiej Zolnierkiewicz)

* pci/misc:
  PCI: pcie: Remove redundant 'default n' from Kconfig
  NTB: switchtec_ntb: Update switchtec documentation with prerequisites for NTB
  PCI: Fix Switchtec DMA aliasing quirk dmesg noise
  PCI: Add macro for Switchtec quirk declarations
  PCI: Add Device IDs for Intel GPU "spurious interrupt" quirk
  PCI: Remove pci_set_dma_max_seg_size()
  PCI: Remove pci_set_dma_seg_boundary()
  PCI: Remove pci_unmap_addr() wrappers for DMA API
  PCI / ACPI: Mark expected switch fall-through
  PCI: Remove set but unused variable
  PCI: Fix pci.c kernel-doc parameter warning
  PCI: Allocate dma_alias_mask with bitmap_zalloc()
  PCI: Remove unused NFP32xx IDs
2018-10-20 11:45:30 -05:00
Bjorn Helgaas 20634dc361 Merge branch 'pci/hotplug'
- Differentiate between pciehp surprise and safe removal (Lukas Wunner)

  - Remove unnecessary pciehp includes (Lukas Wunner)

  - Drop pciehp hotplug_slot_ops wrappers (Lukas Wunner)

  - Tolerate PCIe Slot Presence Detect being hardwired to zero to
    workaround broken hardware, e.g., the Wilocity switch/wireless device
    (Lukas Wunner)

  - Unify pciehp controller & slot structs (Lukas Wunner)

  - Constify hotplug_slot_ops (Lukas Wunner)

  - Drop hotplug_slot_info (Lukas Wunner)

  - Embed hotplug_slot struct into users instead of allocating it
    separately (Lukas Wunner)

  - Initialize PCIe port service drivers directly instead of relying on
    initcall ordering (Keith Busch)

  - Restore PCI config state after a slot reset (Keith Busch)

  - Save/restore DPC config state along with other PCI config state (Keith
    Busch)

  - Reference count devices during AER handling to avoid race issue with
    concurrent hot removal (Keith Busch)

  - If an Upstream Port reports ERR_FATAL, don't try to read the Port's
    config space because it is probably unreachable (Keith Busch)

  - During error handling, use slot-specific reset instead of secondary
    bus reset to avoid link up/down issues on hotplug ports (Keith Busch)

  - Restore previous AER/DPC handling that does not remove and re-enumerate
    devices on ERR_FATAL (Keith Busch)

  - Notify all drivers that may be affected by error recovery resets (Keith
    Busch)

  - Always generate error recovery uevents, even if a driver doesn't have
    error callbacks (Keith Busch)

  - Make PCIe link active reporting detection generic (Keith Busch)

  - Support D3cold in PCIe hierarchies during system sleep and runtime,
    including hotplug and Thunderbolt ports (Mika Westerberg)

  - Handle hpmemsize/hpiosize kernel parameters uniformly, whether slots
    are empty or occupied (Jon Derrick)

  - Remove duplicated include from pci/pcie/err.c and unused variable from
    cpqphp (YueHaibing)

  - Remove driver pci_cleanup_aer_uncorrect_error_status() calls (Oza
    Pawandeep)

  - Uninline PCI bus accessors for better ftracing (Keith Busch)

  - Remove unused AER Root Port .error_resume method (Keith Busch)

  - Use kfifo in AER instead of a local version (Keith Busch)

  - Use threaded IRQ in AER bottom half (Keith Busch)

  - Use managed resources in AER core (Keith Busch)

  - Reuse pcie_port_find_device() for AER injection (Keith Busch)

  - Abstract AER interrupt handling to disconnect error injection (Keith
    Busch)

  - Refactor AER injection callbacks to simplify future improvments (Keith
    Busch)

* pci/hotplug:
  PCI/AER: Refactor error injection fallbacks
  PCI/AER: Abstract AER interrupt handling
  PCI/AER: Reuse existing pcie_port_find_device() interface
  PCI/AER: Use managed resource allocations
  PCI/AER: Use threaded IRQ for bottom half
  PCI/AER: Use kfifo_in_spinlocked() to insert locked elements
  PCI/AER: Use kfifo for tracking events instead of reimplementing it
  PCI/AER: Remove error source from AER struct aer_rpc
  PCI/AER: Remove unused aer_error_resume()
  PCI: Uninline PCI bus accessors for better ftracing
  PCI/AER: Remove pci_cleanup_aer_uncorrect_error_status() calls
  PCI: pnv_php: Use kmemdup()
  PCI: cpqphp: Remove set but not used variable 'physical_slot'
  PCI/ERR: Remove duplicated include from err.c
  PCI: Equalize hotplug memory and io for occupied and empty slots
  PCI / ACPI: Whitelist D3 for more PCIe hotplug ports
  ACPI / property: Allow multiple property compatible _DSD entries
  PCI/PME: Implement runtime PM callbacks
  PCI: pciehp: Implement runtime PM callbacks
  PCI/portdrv: Add runtime PM hooks for port service drivers
  PCI/portdrv: Resume upon exit from system suspend if left runtime suspended
  PCI: pciehp: Do not handle events if interrupts are masked
  PCI: pciehp: Disable hotplug interrupt during suspend
  PCI / ACPI: Enable wake automatically for power managed bridges
  PCI: Do not skip power-managed bridges in pci_enable_wake()
  PCI: Make link active reporting detection generic
  PCI: Unify device inaccessible
  PCI/ERR: Always report current recovery status for udev
  PCI/ERR: Simplify broadcast callouts
  PCI/ERR: Run error recovery callbacks for all affected devices
  PCI/ERR: Handle fatal error recovery
  PCI/ERR: Use slot reset if available
  PCI/AER: Don't read upstream ports below fatal errors
  PCI/AER: Take reference on error devices
  PCI/DPC: Save and restore config state
  PCI: portdrv: Restore PCI config state on slot reset
  PCI: portdrv: Initialize service drivers directly
  PCI: hotplug: Document TODOs
  PCI: hotplug: Embed hotplug_slot
  PCI: hotplug: Drop hotplug_slot_info
  PCI: hotplug: Constify hotplug_slot_ops
  PCI: pciehp: Reshuffle controller struct for clarity
  PCI: pciehp: Rename controller struct members for clarity
  PCI: pciehp: Unify controller and slot structs
  PCI: pciehp: Tolerate Presence Detect hardwired to zero
  PCI: pciehp: Drop hotplug_slot_ops wrappers
  PCI: pciehp: Drop unnecessary includes
  PCI: pciehp: Differentiate between surprise and safe removal
  PCI: Simplify disconnected marking
2018-10-20 11:45:29 -05:00
Keith Busch e51cd9ce5d PCI/AER: Refactor error injection fallbacks
Move the bus ops fallback into separate functions.  No functional change
here.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-18 19:43:19 -05:00
Keith Busch 390e2db824 PCI/AER: Abstract AER interrupt handling
The aer_inject module was directly calling aer_irq().  This required the
AER driver export its private IRQ handler for no other reason than to
support error injection.  A driver should not have to expose its private
interfaces, so use the IRQ subsystem to route injection to the AER driver,
and make aer_irq() a private interface.

This provides additional benefits:

First, directly calling the IRQ handler bypassed the IRQ subsytem so the
injection wasn't really synthesizing what happens if a shared AER interrupt
occurs.

The error injection had to provide the callback data directly, which may be
racing with a removal that is freeing that structure.  The IRQ subsystem
can handle that race.

Finally, using the IRQ subsystem automatically reacts to threaded IRQs,
keeping the error injection abstracted from that implementation detail.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-18 19:43:09 -05:00
Keith Busch 0e98db259f PCI/AER: Reuse existing pcie_port_find_device() interface
The port services driver already provides a method to find the pcie_device
for a service.  Export that function, use it from the aer_inject module,
and remove the duplicate functionality.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-18 19:42:54 -05:00
Keith Busch 369fd7b00f PCI/AER: Use managed resource allocations
Use the managed device resource allocations for the service data so the AER
driver doesn't need to manage it, further simplifying this driver.

Link: https://lore.kernel.org/linux-pci/20180918235848.26694-12-keith.busch@intel.com
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-18 19:41:16 -05:00
Bartlomiej Zolnierkiewicz fe73c23d7a PCI: pcie: Remove redundant 'default n' from Kconfig
'default n' is the default value for any bool or tristate Kconfig setting
so there is no need to write it explicitly.

Also since commit f467c5640c ("kconfig: only write '# CONFIG_FOO is not
set' for visible symbols") the Kconfig behavior is the same regardless of
'default n' being present or not:

    ...
    One side effect of (and the main motivation for) this change is making
    the following two definitions behave exactly the same:

        config FOO
                bool

        config FOO
                bool
                default n

    With this change, neither of these will generate a
    '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied).
    That might make it clearer to people that a bare 'default n' is
    redundant.
    ...

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-18 14:05:29 -05:00
Keith Busch 6200cc5ee2 PCI/AER: Use threaded IRQ for bottom half
The threaded IRQ is naturally single threaded as desired, so use that to
simplify the AER bottom half handler.  Since the root port structure has
much less to do now, remove the rpc construction helper routine.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-08 12:18:14 -05:00
Keith Busch ecae65e133 PCI/AER: Use kfifo_in_spinlocked() to insert locked elements
Use the recommended kernel API for writing to a concurrently-accessed
kfifo.  No functional change here.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-08 12:18:13 -05:00
Keith Busch 27c1ce8bbe PCI/AER: Use kfifo for tracking events instead of reimplementing it
The kernel provides a generic FIFO implementation, so no need to reinvent
that capability in a driver.  Replace the AER-specific implementation with
the kernel-provided kfifo.  Since the interrupt handler producer and work
queue consumer run single threaded, there is no need for additional
locking, so remove that lock, too.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-08 12:18:13 -05:00
Keith Busch fcd4d36903 PCI/AER: Remove error source from AER struct aer_rpc
The AER struct aer_rpc was carrying a copy of the error source simply as a
temperary variable.  Remove that from the structure and use a stack
variable for the purpose.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-08 12:18:12 -05:00
Keith Busch 3e41a317ae PCI/AER: Remove unused aer_error_resume()
The error recovery callbacks are only run on child devices.  A Root Port is
never a child device, so this error resume callback was never invoked.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-08 12:18:11 -05:00
YueHaibing 479e01a402 PCI/ERR: Remove duplicated include from err.c
Remove duplicated include.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-02 16:04:40 -05:00
Mika Westerberg 0e157e5286 PCI/PME: Implement runtime PM callbacks
Basically we need to do the same steps than what we do when system sleep is
entered and disable PME interrupt when the root port is runtime suspended.
This prevents spurious wakeups immediately when the port is transitioned
into D3cold.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-10-02 16:04:40 -05:00
Mika Westerberg 94c7993fb5 PCI/portdrv: Add runtime PM hooks for port service drivers
When PCIe port is runtime suspended/resumed some extra steps might be
needed to be executed from the port service driver side. For instance we
may need to disable PCIe hotplug interrupt to prevent it from triggering
immediately when PCIe link to the downstream component goes down.

To make the above possible add optional ->runtime_suspend() and
->runtime_resume() callbacks to struct pcie_port_service_driver and call
them for each port service in runtime suspend/resume callbacks of portdrv.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
[bhelgaas: adjust "slot->state" for 5790a9c78e ("PCI: pciehp: Unify
controller and slot structs")]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2018-10-02 16:04:40 -05:00
Mika Westerberg 52be9464aa PCI/portdrv: Resume upon exit from system suspend if left runtime suspended
Currently we try to keep PCIe ports runtime suspended over system suspend
if possible. This mostly happens when entering suspend-to-idle because
there is no need to re-configure wake settings.

This causes problems if the parent port goes into D3cold and it gets
resumed upon exit from system suspend. This may happen for example if the
port is part of PCIe switch and the same switch is connected to a PCIe
endpoint that needs to be resumed. The way exit from D3cold works according
PCIe 4.0 spec 5.3.1.4.2 is that power is restored and cold reset is
signaled. After this the device is in D0unitialized state keeping PME
context if it supports wake from D3cold.

The problem occurs when a PCIe hotplug port is left suspended and the
parent port goes into D3cold and back to D0: the port keeps its PME context
but since everything else is reset back to defaults (D0unitialized) it is
not set to detect hotplug events anymore.

For this reason change the PCIe portdrv power management logic so that it
is fine to keep the port runtime suspended over system suspend but it needs
to be resumed upon exit to make sure it gets properly re-initialized.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2018-10-02 16:04:40 -05:00
Keith Busch f0157160b3 PCI: Make link active reporting detection generic
The spec has timing requirements when waiting for a link to become active
after a conventional reset.  Implement those hard delays when waiting for
an active link so pciehp and dpc drivers don't need to duplicate this.

For devices that don't support data link layer active reporting, wait the
fixed time recommended by the PCIe spec.

Signed-off-by: Keith Busch <keith.busch@intel.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-10-02 16:04:40 -05:00
Keith Busch a6bd101b8f PCI: Unify device inaccessible
Bring surprise removals and permanent failures together so we no longer
need separate flags.  The implementation enforces that error handling will
not be able to override a surprise removal's permanent channel failure.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-10-02 16:04:40 -05:00
Keith Busch 7b42d97e99 PCI/ERR: Always report current recovery status for udev
A device still participates in error recovery even if it doesn't have
the error callbacks.

Always provide the status for user event watchers.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-10-02 16:04:40 -05:00
Keith Busch 542aeb9c8f PCI/ERR: Simplify broadcast callouts
There is no point in having a generic broadcast function if it needs to
have special cases for each callback it broadcasts.

Abstract the error broadcast to only the necessary information and removes
the now unnecessary helper to walk the bus.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-10-02 16:04:40 -05:00
Keith Busch bfcb79fca1 PCI/ERR: Run error recovery callbacks for all affected devices
If an Endpoint reported an error with ERR_FATAL, we previously ran driver
error recovery callbacks only for the Endpoint's driver.  But if we reset a
Link to recover from the error, all downstream components are affected,
including the Endpoint, any multi-function peers, and children of those
peers.

Initiate the Link reset from the deepest Downstream Port that is
reliable, and call the error recovery callbacks for all its children.

If a Downstream Port (including a Root Port) reports an error, we assume
the Port itself is reliable and we need to reset its downstream Link.  In
all other cases (Switch Upstream Ports, Endpoints, Bridges, etc), we assume
the Link leading to the component needs to be reset, so we initiate the
reset at the parent Downstream Port.

This allows two other clean-ups.  First, we currently only use a Link
reset, which can only be initiated using a Downstream Port, so we can
remove checks for Endpoints.  Second, the Downstream Port where we initiate
the Link reset is reliable (unlike components downstream from it), so the
special cases for error detect and resume are no longer necessary.

Signed-off-by: Keith Busch <keith.busch@intel.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-09-26 14:23:15 -05:00
Keith Busch bdb5ac8577 PCI/ERR: Handle fatal error recovery
We don't need to be paranoid about the topology changing while handling an
error.  If the device has changed in a hotplug capable slot, we can rely on
the presence detection handling to react to a changing topology.

Restore the fatal error handling behavior that existed before merging DPC
with AER with 7e9084b367 ("PCI/AER: Handle ERR_FATAL with removal and
re-enumeration of devices").

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-09-26 14:23:14 -05:00
Keith Busch c4eed62a21 PCI/ERR: Use slot reset if available
The secondary bus reset may have link side effects that a hotplug capable
port may incorrectly react to.  Use the slot specific reset for hotplug
ports, fixing the undesirable link down-up handling during error
recovering.

Signed-off-by: Keith Busch <keith.busch@intel.com>
[bhelgaas: fold in
https://lore.kernel.org/linux-pci/20180926152326.14821-1-keith.busch@intel.com
for issue reported by Stephen Rothwell <sfr@canb.auug.org.au>]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-09-21 12:18:10 -05:00
Keith Busch 9d938ea53b PCI/AER: Don't read upstream ports below fatal errors
The AER driver has never read the config space of an endpoint that reported
a fatal error because the link to that device is considered unreliable.

An ERR_FATAL from an upstream port almost certainly indicates an error on
its upstream link, so we can't expect to reliably read its config space for
the same reason.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-09-21 12:18:09 -05:00
Keith Busch 60271ab044 PCI/AER: Take reference on error devices
Error handling may be running in parallel with a hot removal.  Reference
count the device during AER handling so the device can not be freed while
AER wants to reference it.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-09-21 12:18:08 -05:00
Keith Busch 4f802170a8 PCI/DPC: Save and restore config state
This patch provides DPC save and restore capabilities.  This is necessary
for the driver to observe DPC events in the event the configuration space
needs to be restored after a reset.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-09-20 16:06:27 -05:00
Keith Busch 874b325111 PCI: portdrv: Restore PCI config state on slot reset
The port's config space may be cleared after a link reset, which wipes out
the bridge's bus and memory windows.  Restore the config space that was
saved during probe so we can access downstream devices.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-09-20 16:06:18 -05:00
Keith Busch c29de84149 PCI: portdrv: Initialize service drivers directly
The PCI port driver saves the PCI state after initializing the device with
the applicable service devices.  This was, however, before the service
drivers were even registered because PCI probe happens before the
device_initcall initialized those service drivers.  The config space state
that the services set up were not being saved.  The end result would cause
PCI devices to not react to events that the drivers think they did if the
PCI state ever needed to be restored.

Fix this by changing the service drivers from using the init calls to
having the portdrv driver calling the services directly.  This will get the
state saved as desired, while making the relationship between the port
driver and the services under it more explicit in the code.

Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>
2018-09-20 12:05:54 -05:00