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authorKuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>2020-03-23 17:26:02 -0700
committerBjorn Helgaas <bhelgaas@google.com>2020-03-28 13:18:54 -0500
commitb6cf1a42f916af0b056079c37fc5fa7bf8e4b2e2 (patch)
tree0f41fe19ae3df4681d9adc1b2c24cf17be0238c6 /Documentation/PCI/pcieaer-howto.rst
parentbe06c1b42eea749547d2f0248dc0a7c1153f67b9 (diff)
PCI/ERR: Remove service dependency in pcie_do_recovery()
Previously we passed the PCIe service type parameter to pcie_do_recovery(), where reset_link() looked up the underlying pci_port_service_driver and its .reset_link() function pointer. Instead of using this roundabout way, we can just pass the driver-specific .reset_link() callback function when calling pcie_do_recovery() function. This allows us to call pcie_do_recovery() from code that is not a PCIe port service driver, e.g., Error Disconnect Recover (EDR) support. Remove pcie_port_find_service() and pcie_port_service_driver.reset_link since they are now unused. Link: https://lore.kernel.org/r/60e02b87b526cdf2930400059d98704bf0a147d1.1585000084.git.sathyanarayanan.kuppuswamy@linux.intel.com Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Documentation/PCI/pcieaer-howto.rst')
-rw-r--r--Documentation/PCI/pcieaer-howto.rst19
1 files changed, 4 insertions, 15 deletions
diff --git a/Documentation/PCI/pcieaer-howto.rst b/Documentation/PCI/pcieaer-howto.rst
index 18bdefaafd1a..afbd8c1c321d 100644
--- a/Documentation/PCI/pcieaer-howto.rst
+++ b/Documentation/PCI/pcieaer-howto.rst
@@ -156,12 +156,6 @@ default reset_link function, but different upstream ports might
have different specifications to reset pci express link, so all
upstream ports should provide their own reset_link functions.
-In struct pcie_port_service_driver, a new pointer, reset_link, is
-added.
-::
-
- pci_ers_result_t (*reset_link) (struct pci_dev *dev);
-
Section 3.2.2.2 provides more detailed info on when to call
reset_link.
@@ -212,15 +206,10 @@ error_detected(dev, pci_channel_io_frozen) to all drivers within
a hierarchy in question. Then, performing link reset at upstream is
necessary. As different kinds of devices might use different approaches
to reset link, AER port service driver is required to provide the
-function to reset link. Firstly, kernel looks for if the upstream
-component has an aer driver. If it has, kernel uses the reset_link
-callback of the aer driver. If the upstream component has no aer driver
-and the port is downstream port, we will perform a hot reset as the
-default by setting the Secondary Bus Reset bit of the Bridge Control
-register associated with the downstream port. As for upstream ports,
-they should provide their own aer service drivers with reset_link
-function. If error_detected returns PCI_ERS_RESULT_CAN_RECOVER and
-reset_link returns PCI_ERS_RESULT_RECOVERED, the error handling goes
+function to reset link via callback parameter of pcie_do_recovery()
+function. If reset_link is not NULL, recovery function will use it
+to reset the link. If error_detected returns PCI_ERS_RESULT_CAN_RECOVER
+and reset_link returns PCI_ERS_RESULT_RECOVERED, the error handling goes
to mmio_enabled.
helper functions