Re: [PATCH v5 3/7] PCI: Remove reset_fn field from pci_dev

[Bjorn Helgaas <helgaas@kernel.org>]

On Sun, May 30, 2021 at 12:55:23AM +0530, Amey Narkhede wrote:
> 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 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.

s/Deprecate use of/Remove/
("deprecate" means to disapprove of something, and you're doing more
than that :))

Rewrap above to fill 75 columns.  Separate paragraphs with blank
lines.  Add "()" after function names (mentioned elsewhere, but please
do it everywhere).

> 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 516f166ce..336d149ee 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 beb8d1f4f..316f70c3e 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 67a2605d4..bbed852d9 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -5231,7 +5231,7 @@ 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);
> @@ -5267,7 +5267,7 @@ 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);
> @@ -5290,7 +5290,7 @@ 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 8cf532681..90fd4f61f 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -2405,7 +2405,6 @@ 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 f977ba79a..e86cf4a3b 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5589,7 +5589,7 @@ 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 dd12c2fcc..4c54c7505 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 0955246f8..6e9bc4f9c 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -429,7 +429,6 @@ 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 */
> -- 
> 2.31.1
>