A user can issue a pci function level reset to a device using sysfs entry
/sys/bus/pci/devices/.../reset. A kernel driver handling the pci device
might like to know this reset is about to occur and when the reset attempt
completes. This is so the driver has a chance to take appropriate device
specific actions; for example, it may need to quiesce before the reset,
and reinitialize the device after.
Signed-off-by: Keith Busch <keith.busch@xxxxxxxxx>
---
drivers/pci/pci.c | 13 +++++++++++++
include/linux/pci.h | 3 +++
2 files changed, 16 insertions(+)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index fdbc294..cb24bbe 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3320,6 +3320,15 @@ static int pci_dev_reset(struct pci_dev *dev, int probe)
return rc;
}
+
+static void pci_reset_notify(struct pci_dev *dev, bool prepare)
+{
+ const struct pci_error_handlers *err_handler =
+ dev->driver ? dev->driver->err_handler : NULL;
+ if (err_handler && err_handler->reset_notify)
+ err_handler->reset_notify(dev, prepare);
+}
+
/**
* __pci_reset_function - reset a PCI device function
* @dev: PCI device to reset
@@ -3408,11 +3417,13 @@ int pci_reset_function(struct pci_dev *dev)
if (rc)
return rc;
+ pci_reset_notify(dev, true);
pci_dev_save_and_disable(dev);
rc = pci_dev_reset(dev, 0);
pci_dev_restore(dev);
+ pci_reset_notify(dev, false);
return rc;
}
@@ -3432,6 +3443,7 @@ int pci_try_reset_function(struct pci_dev *dev)
if (rc)
return rc;
+ pci_reset_notify(dev, true);
pci_dev_save_and_disable(dev);
if (pci_dev_trylock(dev)) {
@@ -3441,6 +3453,7 @@ int pci_try_reset_function(struct pci_dev *dev)
rc = -EAGAIN;
pci_dev_restore(dev);
+ pci_reset_notify(dev, false);
return rc;
}
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 33aa2ca..d82dd3f 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -603,6 +603,9 @@ struct pci_error_handlers {
/* PCI slot has been reset */
pci_ers_result_t (*slot_reset)(struct pci_dev *dev);
+ /* PCI function reset prepare or completed */
+ void (*reset_notify)(struct pci_dev *dev, bool prepare);
+
/* Device driver may resume normal operations */
void (*resume)(struct pci_dev *dev);
};
--
1.7.10.4
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