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df72184ec1
xemu/hw/pci
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Laurent Vivier df72184ec1 pcie: don't set link state active if the slot is empty 
When the pcie slot is initialized, by default PCI_EXP_LNKSTA_DLLLA
(Data Link Layer Link Active) is set in PCI_EXP_LNKSTA
(Link Status) without checking if the slot is empty or not.

This is confusing for the kernel because as it sees the link is up
it tries to read the vendor ID and fails:

(From https://bugzilla.kernel.org/show_bug.cgi?id=211691)

[    1.661105] pcieport 0000:00:02.2: pciehp: Slot Capabilities      : 0x0002007b
[    1.661115] pcieport 0000:00:02.2: pciehp: Slot Status            : 0x0010
[    1.661123] pcieport 0000:00:02.2: pciehp: Slot Control           : 0x07c0
[    1.661138] pcieport 0000:00:02.2: pciehp: Slot #0 AttnBtn+ PwrCtrl+ MRL- AttnInd+ PwrInd+ HotPlug+ Surprise+ Interlock+ NoCompl- IbPresDis- LLActRep+
[    1.662581] pcieport 0000:00:02.2: pciehp: pciehp_get_power_status: SLOTCTRL 6c value read 7c0
[    1.662597] pcieport 0000:00:02.2: pciehp: pciehp_check_link_active: lnk_status = 2204
[    1.662703] pcieport 0000:00:02.2: pciehp: pending interrupts 0x0010 from Slot Status
[    1.662706] pcieport 0000:00:02.2: pciehp: pcie_enable_notification: SLOTCTRL 6c write cmd 1031
[    1.662730] pcieport 0000:00:02.2: pciehp: pciehp_check_link_active: lnk_status = 2204
[    1.662748] pcieport 0000:00:02.2: pciehp: pciehp_check_link_active: lnk_status = 2204
[    1.662750] pcieport 0000:00:02.2: pciehp: Slot(0-2): Link Up
[    2.896132] pcieport 0000:00:02.2: pciehp: pciehp_check_link_status: lnk_status = 2204
[    2.896135] pcieport 0000:00:02.2: pciehp: Slot(0-2): No device found
[    2.896900] pcieport 0000:00:02.2: pciehp: pending interrupts 0x0010 from Slot Status
[    2.896903] pcieport 0000:00:02.2: pciehp: pciehp_power_off_slot: SLOTCTRL 6c write cmd 400
[    3.656901] pcieport 0000:00:02.2: pciehp: pending interrupts 0x0009 from Slot Status

This is really a problem with virtio-net failover that hotplugs a VFIO
card during the boot process. The kernel can shutdown the slot while
QEMU is hotplugging it, and this likely ends by an automatic unplug of
the card. At the end of the boot sequence the card has disappeared.

To fix that, don't set the "Link Active" state in the init function, but
rely on the plug function to do it, as the mechanism has already been
introduced by 2f2b18f60b.

Fixes: 2f2b18f60b ("pcie: set link state inactive/active after hot unplug/plug")
Cc: zhengxiang9@huawei.com
Fixes: 3d67447fe7 ("pcie: Fill PCIESlot link fields to support higher speeds and widths")
Cc: alex.williamson@redhat.com
Fixes: b2101eae63 ("pcie: Set the "link active" in the link status register")
Cc: benh@kernel.crashing.org
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Message-Id: <20210212135250.2738750-5-lvivier@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2021-02-23 10:06:55 -05:00
..
Kconfig kconfig: add CONFIG_MSI_NONBROKEN 2019-03-18 09:39:57 +01:00
meson.build meson: convert hw/pci 2020-08-21 06:30:28 -04:00
msi.c pci/msi: export msi_is_masked() 2019-02-05 10:58:33 -05:00
msix.c migration: Replace migration's JSON writer by the general one 2020-12-19 10:39:16 +01:00
pci_bridge.c hw/pci/pci_bridge: Use the IEC binary prefix definitions 2020-06-09 14:18:04 -04:00
pci_host.c hw/pci-host: save/restore pci host config register 2020-07-27 10:24:39 -04:00
pci-stub.c qapi: Extract PCI commands to 'pci.json' 2020-09-29 15:41:36 +02:00
pci.c pci: cleanup failover sanity check 2021-02-23 10:06:55 -05:00
pcie_aer.c Include migration/vmstate.h less 2019-08-16 13:31:52 +02:00
pcie_host.c Include hw/hw.h exactly where needed 2019-08-16 13:31:52 +02:00
pcie_port.c pcie_root_port: Add hotplug disabling option 2020-03-08 09:18:29 -04:00
pcie.c pcie: don't set link state active if the slot is empty 2021-02-23 10:06:55 -05:00
shpc.c pci/shpc: don't push attention button when ejecting powered-off device 2021-01-13 09:06:37 -05:00
slotid_cap.c pci: Convert shpc_init() to Error 2017-07-03 22:29:49 +03:00
trace-events trace-events: Shorten file names in comments 2019-03-22 16:18:07 +00:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00