[PATCH v12 3/8] PCI: Remove reset_fn field from pci_dev

Shanker Donthineni
2021-07-16T15:24:46Z

reset_fn field is used to indicate whether the device supports any reset
mechanism or not. Remove the use of reset_fn in favor of new reset_methods
array which can be used to keep track of all supported reset mechanisms of
a device and their ordering.

The octeon driver is incorrectly using reset_fn field to detect if the
device supports FLR or not. Use pcie_reset_flr() to probe whether it
supports FLR or not.

Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Co-developed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
---
drivers/net/ethernet/cavium/liquidio/lio_vf_main.c | 2 +-
drivers/pci/pci-sysfs.c | 2 +-
drivers/pci/pci.c | 6 +++---
drivers/pci/probe.c | 1 -
drivers/pci/quirks.c | 2 +-
drivers/pci/remove.c | 1 -
include/linux/pci.h | 1 -
7 files changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
index ffddb3126a323..d185df5acea69 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c
@@ -526,7 +526,7 @@ static void octeon_destroy_resources(struct octeon_device *oct)
oct->irq_name_storage = NULL;
}
/* Soft reset the octeon device before exiting */
- if (oct->pci_dev->reset_fn)
+ if (!pcie_reset_flr(oct->pci_dev, 1))
octeon_pci_flr(oct);
else
cn23xx_vf_ask_pf_to_do_flr(oct);
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 5d63df7c18206..a1d9b0e83615a 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -1367,7 +1367,7 @@ static umode_t pci_dev_reset_attr_is_visible(struct kobject *kobj,
{
struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));

- if (!pdev->reset_fn)
+ if (!pci_reset_supported(pdev))
return 0;

return a->mode;
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 4d5618b232363..cc9f96effa546 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -5233,7 +5233,7 @@ int pci_reset_function(struct pci_dev *dev)
{
int rc;

- if (!dev->reset_fn)
+ if (!pci_reset_supported(dev))
return -ENOTTY;

pci_dev_lock(dev);
@@ -5269,7 +5269,7 @@ int pci_reset_function_locked(struct pci_dev *dev)
{
int rc;

- if (!dev->reset_fn)
+ if (!pci_reset_supported(dev))
return -ENOTTY;

pci_dev_save_and_disable(dev);
@@ -5292,7 +5292,7 @@ int pci_try_reset_function(struct pci_dev *dev)
{
int rc;

- if (!dev->reset_fn)
+ if (!pci_reset_supported(dev))
return -ENOTTY;

if (!pci_dev_trylock(dev))
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 4ce7979d703eb..66f052446de20 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2431,7 +2431,6 @@ static void pci_init_capabilities(struct pci_dev *dev)

pcie_report_downtraining(dev);
pci_init_reset_methods(dev);
- dev->reset_fn = pci_reset_supported(dev);
}

/*
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 90144fbc4f4ea..f43883a2e33df 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5626,7 +5626,7 @@ static void quirk_reset_lenovo_thinkpad_p50_nvgpu(struct pci_dev *pdev)

if (pdev->subsystem_vendor != PCI_VENDOR_ID_LENOVO ||
pdev->subsystem_device != 0x222e ||
- !pdev->reset_fn)
+ !pci_reset_supported(pdev))
return;

if (pci_enable_device_mem(pdev))
diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index dd12c2fcc7dc1..4c54c75050dc1 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -19,7 +19,6 @@ static void pci_stop_dev(struct pci_dev *dev)
pci_pme_active(dev, false);

if (pci_dev_is_added(dev)) {
- dev->reset_fn = 0;

device_release_driver(&dev->dev);
pci_proc_detach_device(dev);
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 8c2d3a357eedb..58cc2e2b05051 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -431,7 +431,6 @@ struct pci_dev {
unsigned int state_saved:1;
unsigned int is_physfn:1;
unsigned int is_virtfn:1;
- unsigned int reset_fn:1;
unsigned int is_hotplug_bridge:1;
unsigned int shpc_managed:1; /* SHPC owned by shpchp */
unsigned int is_thunderbolt:1; /* Thunderbolt controller */
--
2.25.1