On Friday 12 March 2021 23:04:51 [email protected] wrote: > From: Amey Narkhede <[email protected]> > > reset_fn field is used to indicate whether the > device supports any reset mechanism or not. > Deprecate use of reset_fn in favor of new > reset_methods bitmap which can be used to keep > track of all supported reset mechanisms of a device.
Hello Amey! You cannot trigger PCIe Hot Reset (PCI secondary bus reset) in this simple way from sysfs via new reset methods. I proposed very similar functionality just few days ago: https://lore.kernel.org/linux-pci/20210301171221.3d42a55i7h5ubqsb@pali/T/#u And I realized that it needs more steps to be done. At least some remove-reset-rescan procedure done atomically is required. > Signed-off-by: Amey Narkhede <[email protected]> > --- > Reviewed-by: Alex Williamson <[email protected]> > Reviewed-by: Raphael Norwitz <[email protected]> > > drivers/net/ethernet/cavium/liquidio/lio_vf_main.c | 2 +- > drivers/pci/pci-sysfs.c | 6 ++---- > drivers/pci/pci.c | 6 +++--- > drivers/pci/probe.c | 1 - > drivers/pci/quirks.c | 2 +- > include/linux/pci.h | 1 - > 6 files changed, 7 insertions(+), 11 deletions(-) > > diff --git a/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c > b/drivers/net/ethernet/cavium/liquidio/lio_vf_main.c > index 9b9d305c6..3e2c49e08 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 (oct->pci_dev->reset_methods) > 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 f8afd54ca..78d2c130c 100644 > --- a/drivers/pci/pci-sysfs.c > +++ b/drivers/pci/pci-sysfs.c > @@ -1334,7 +1334,7 @@ static int pci_create_capabilities_sysfs(struct pci_dev > *dev) > > pcie_vpd_create_sysfs_dev_files(dev); > > - if (dev->reset_fn) { > + if (dev->reset_methods) { > retval = device_create_file(&dev->dev, &dev_attr_reset); > if (retval) > goto error; > @@ -1417,10 +1417,8 @@ int __must_check pci_create_sysfs_dev_files(struct > pci_dev *pdev) > static void pci_remove_capabilities_sysfs(struct pci_dev *dev) > { > pcie_vpd_remove_sysfs_dev_files(dev); > - if (dev->reset_fn) { > + if (dev->reset_methods) > device_remove_file(&dev->dev, &dev_attr_reset); > - dev->reset_fn = 0; > - } > } > > /** > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index 407b44e85..b7f6c6588 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -5175,7 +5175,7 @@ int pci_reset_function(struct pci_dev *dev) > { > int rc; > > - if (!dev->reset_fn) > + if (!dev->reset_methods) > return -ENOTTY; > > pci_dev_lock(dev); > @@ -5211,7 +5211,7 @@ int pci_reset_function_locked(struct pci_dev *dev) > { > int rc; > > - if (!dev->reset_fn) > + if (!dev->reset_methods) > return -ENOTTY; > > pci_dev_save_and_disable(dev); > @@ -5234,7 +5234,7 @@ int pci_try_reset_function(struct pci_dev *dev) > { > int rc; > > - if (!dev->reset_fn) > + if (!dev->reset_methods) > return -ENOTTY; > > if (!pci_dev_trylock(dev)) > diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c > index 01dd037bd..4764e031a 100644 > --- a/drivers/pci/probe.c > +++ b/drivers/pci/probe.c > @@ -2404,7 +2404,6 @@ static void pci_init_capabilities(struct pci_dev *dev) > > pcie_report_downtraining(dev); > pci_init_reset_methods(dev); > - dev->reset_fn = !!dev->reset_methods; > } > > /* > diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c > index 0a3df84c9..20a81b1bc 100644 > --- a/drivers/pci/quirks.c > +++ b/drivers/pci/quirks.c > @@ -5535,7 +5535,7 @@ 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) > + !pdev->reset_methods) > return; > > if (pci_enable_device_mem(pdev)) > diff --git a/include/linux/pci.h b/include/linux/pci.h > index 56d6e4750..a2f003f4e 100644 > --- a/include/linux/pci.h > +++ b/include/linux/pci.h > @@ -437,7 +437,6 @@ 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 */ > -- > 2.30.2
