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PCI/AER: Remove unused .link_reset() callback

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No hardware seems to actually call .link_reset(), and no driver implements
it as more than a nop stub.

Drop mentions of the callback from everywhere.  It's dropped from the
documentation as well, but the doc really needs to be updated to reflect
reality better (e.g., on PCIe, slot reset is the link reset).  This will be
done in a later patch.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Michael S. Tsirkin 2017-01-24 19:35:56 +02:00 committed by Bjorn Helgaas
parent 7ce7d89f48
commit 2fd260f03b
6 changed files with 3 additions and 50 deletions
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24
Documentation/PCI/pci-error-recovery.txt
View File

@ -78,7 +78,6 @@ struct pci_error_handlers
{
int (*error_detected)(struct pci_dev *dev, enum pci_channel_state);
int (*mmio_enabled)(struct pci_dev *dev);
int (*link_reset)(struct pci_dev *dev);
int (*slot_reset)(struct pci_dev *dev);
void (*resume)(struct pci_dev *dev);
};
@ -104,8 +103,7 @@ if it implements any, it must implement error_detected(). If a callback
is not implemented, the corresponding feature is considered unsupported.
For example, if mmio_enabled() and resume() aren't there, then it
is assumed that the driver is not doing any direct recovery and requires
a slot reset. If link_reset() is not implemented, the card is assumed to
not care about link resets. Typically a driver will want to know about
a slot reset. Typically a driver will want to know about
a slot_reset().
The actual steps taken by a platform to recover from a PCI error
@ -232,25 +230,9 @@ proceeds to STEP 4 (Slot Reset)
STEP 3: Link Reset
------------------
The platform resets the link, and then calls the link_reset() callback
on all affected device drivers. This is a PCI-Express specific state
The platform resets the link. This is a PCI-Express specific step
and is done whenever a non-fatal error has been detected that can be
"solved" by resetting the link. This call informs the driver of the
reset and the driver should check to see if the device appears to be
in working condition.
The driver is not supposed to restart normal driver I/O operations
at this point. It should limit itself to "probing" the device to
check its recoverability status. If all is right, then the platform
will call resume() once all drivers have ack'd link_reset().
Result codes:
(identical to STEP 3 (MMIO Enabled)
The platform then proceeds to either STEP 4 (Slot Reset) or STEP 5
(Resume Operations).
>>> The current powerpc implementation does not implement this callback.
"solved" by resetting the link.
STEP 4: Slot Reset
------------------

10
drivers/infiniband/hw/hfi1/pcie.c
View File

@ -598,15 +598,6 @@ pci_slot_reset(struct pci_dev *pdev)
return PCI_ERS_RESULT_CAN_RECOVER;
}
static pci_ers_result_t
pci_link_reset(struct pci_dev *pdev)
{
struct hfi1_devdata *dd = pci_get_drvdata(pdev);
dd_dev_info(dd, "HFI1 link_reset function called, ignored\n");
return PCI_ERS_RESULT_CAN_RECOVER;
}
static void
pci_resume(struct pci_dev *pdev)
{
@ -625,7 +616,6 @@ pci_resume(struct pci_dev *pdev)
const struct pci_error_handlers hfi1_pci_err_handler = {
.error_detected = pci_error_detected,
.mmio_enabled = pci_mmio_enabled,
.link_reset = pci_link_reset,
.slot_reset = pci_slot_reset,
.resume = pci_resume,
};

8
drivers/infiniband/hw/qib/qib_pcie.c
View File

@ -682,13 +682,6 @@ qib_pci_slot_reset(struct pci_dev *pdev)
return PCI_ERS_RESULT_CAN_RECOVER;
}
static pci_ers_result_t
qib_pci_link_reset(struct pci_dev *pdev)
{
qib_devinfo(pdev, "QIB link_reset function called, ignored\n");
return PCI_ERS_RESULT_CAN_RECOVER;
}
static void
qib_pci_resume(struct pci_dev *pdev)
{
@ -707,7 +700,6 @@ qib_pci_resume(struct pci_dev *pdev)
const struct pci_error_handlers qib_pci_err_handler = {
.error_detected = qib_pci_error_detected,
.mmio_enabled = qib_pci_mmio_enabled,
.link_reset = qib_pci_link_reset,
.slot_reset = qib_pci_slot_reset,
.resume = qib_pci_resume,
};

7
drivers/media/pci/ngene/ngene-cards.c
View File

@ -781,12 +781,6 @@ static pci_ers_result_t ngene_error_detected(struct pci_dev *dev,
return PCI_ERS_RESULT_CAN_RECOVER;
}
static pci_ers_result_t ngene_link_reset(struct pci_dev *dev)
{
printk(KERN_INFO DEVICE_NAME ": link reset\n");
return 0;
}
static pci_ers_result_t ngene_slot_reset(struct pci_dev *dev)
{
printk(KERN_INFO DEVICE_NAME ": slot reset\n");
@ -800,7 +794,6 @@ static void ngene_resume(struct pci_dev *dev)
static const struct pci_error_handlers ngene_errors = {
.error_detected = ngene_error_detected,
.link_reset = ngene_link_reset,
.slot_reset = ngene_slot_reset,
.resume = ngene_resume,
};

1
drivers/misc/genwqe/card_base.c
View File

@ -1336,7 +1336,6 @@ static int genwqe_sriov_configure(struct pci_dev *dev, int numvfs)
static struct pci_error_handlers genwqe_err_handler = {
.error_detected = genwqe_err_error_detected,
.mmio_enabled = genwqe_err_result_none,
.link_reset = genwqe_err_result_none,
.slot_reset = genwqe_err_slot_reset,
.resume = genwqe_err_resume,
};

3
include/linux/pci.h
View File

@ -678,9 +678,6 @@ struct pci_error_handlers {
/* MMIO has been re-enabled, but not DMA */
pci_ers_result_t (*mmio_enabled)(struct pci_dev *dev);
/* PCI Express link has been reset */
pci_ers_result_t (*link_reset)(struct pci_dev *dev);
/* PCI slot has been reset */
pci_ers_result_t (*slot_reset)(struct pci_dev *dev);