kernel.git/drivers/pci/pcie/err.c, branch linux-5.4.y

PCI: Get rid of dev->has_secondary_link flag

2019-09-07T12:45:31Z

In some systems, the Device/Port Type in the PCI Express Capabilities register incorrectly identifies upstream ports as downstream ports. d0751b98dfa3 ("PCI: Add dev->has_secondary_link to track downstream PCIe links") addressed this by adding pci_dev.has_secondary_link, which is set for downstream ports. But this is confusing because pci_pcie_type() sometimes gives the wrong answer, and it's not obvious that we should use pci_dev.has_secondary_link instead. Reduce the confusion by correcting the type of the port itself so that pci_pcie_type() returns the actual type regardless of what the Device/Port Type register claims it is. Update the users to call pci_pcie_type() and pcie_downstream_port() accordingly, and remove pci_dev.has_secondary_link completely. Link: https://lore.kernel.org/linux-pci/20190703133953.GK128603@google.com/ Suggested-by: Bjorn Helgaas Link: https://lore.kernel.org/r/20190822085553.62697-2-mika.westerberg@linux.intel.com Signed-off-by: Mika Westerberg Signed-off-by: Bjorn Helgaas Reviewed-by: Andy Shevchenko

PCI/ERR: Remove duplicated include from err.c

2018-10-02T21:04:40Z

Remove duplicated include. Signed-off-by: YueHaibing Signed-off-by: Bjorn Helgaas

PCI: Unify device inaccessible

2018-10-02T21:04:40Z

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 Signed-off-by: Bjorn Helgaas Reviewed-by: Sinan Kaya

PCI/ERR: Always report current recovery status for udev

2018-10-02T21:04:40Z

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 Signed-off-by: Bjorn Helgaas Reviewed-by: Sinan Kaya

PCI/ERR: Simplify broadcast callouts

2018-10-02T21:04:40Z

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 Signed-off-by: Bjorn Helgaas Reviewed-by: Sinan Kaya

PCI/ERR: Run error recovery callbacks for all affected devices

2018-09-26T19:23:15Z

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 [bhelgaas: changelog] Signed-off-by: Bjorn Helgaas Reviewed-by: Sinan Kaya

PCI/ERR: Handle fatal error recovery

2018-09-26T19:23:14Z

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 7e9084b36740 ("PCI/AER: Handle ERR_FATAL with removal and re-enumeration of devices"). Signed-off-by: Keith Busch Signed-off-by: Bjorn Helgaas Reviewed-by: Sinan Kaya

PCI/ERR: Use slot reset if available

2018-09-21T17:18:10Z

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 [bhelgaas: fold in https://lore.kernel.org/linux-pci/20180926152326.14821-1-keith.busch@intel.com for issue reported by Stephen Rothwell ] Signed-off-by: Bjorn Helgaas Reviewed-by: Sinan Kaya

PCI: Simplify disconnected marking

2018-09-17T21:34:35Z

Commit 89ee9f768003 ("PCI: Add device disconnected state") iterates over the devices on a parent bus, marks each as disconnected, then marks each device's children as disconnected using pci_walk_bus(). The same can be achieved more succinctly by calling pci_walk_bus() on the parent bus. Moreover, this does not need to wait until acquiring pci_lock_rescan_remove(), so move it out of that critical section. The critical section in err.c contains a pci_dev_get() / pci_dev_put() pair which was apparently copy-pasted from pciehp_pci.c. In the latter it serves the purpose of holding the struct pci_dev in place until the Command register is updated. err.c doesn't do anything like that, hence the pair is unnecessary. Remove it. Signed-off-by: Lukas Wunner Signed-off-by: Bjorn Helgaas Cc: Keith Busch Cc: Oza Pawandeep Cc: Sinan Kaya Cc: Benjamin Herrenschmidt

Merge branch 'pci/virtualization'

2018-08-15T19:59:06Z

- To avoid bus errors, enable PASID only if entire path supports End-End TLP prefixes (Sinan Kaya) - Unify slot and bus reset functions and remove hotplug knowledge from callers (Sinan Kaya) - Add Function-Level Reset quirks for Intel and Samsung NVMe devices to fix guest reboot issues (Alex Williamson) - Add function 1 DMA alias quirk for Marvell 88SS9183 PCIe SSD Controller (Bjorn Helgaas) * pci/virtualization: PCI: Add function 1 DMA alias quirk for Marvell 88SS9183 PCI: Delay after FLR of Intel DC P3700 NVMe PCI: Disable Samsung SM961/PM961 NVMe before FLR PCI: Export pcie_has_flr() PCI: Rename pci_try_reset_bus() to pci_reset_bus() PCI: Deprecate pci_reset_bus() and pci_reset_slot() functions PCI: Unify try slot and bus reset API PCI: Hide pci_reset_bridge_secondary_bus() from drivers IB/hfi1: Use pci_try_reset_bus() for initiating PCI Secondary Bus Reset PCI: Handle error return from pci_reset_bridge_secondary_bus() PCI/IOV: Tidy pci_sriov_set_totalvfs() PCI: Enable PASID only if entire path supports End-End TLP prefixes # Conflicts: # drivers/pci/hotplug/pciehp_hpc.c