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Message-ID: <20210605205739.GA2322756@bjorn-Precision-5520>
Date: Sat, 5 Jun 2021 15:57:39 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Amey Narkhede <ameynarkhede03@...il.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, alex.williamson@...hat.com,
Raphael Norwitz <raphael.norwitz@...anix.com>,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
kw@...ux.com, Shanker Donthineni <sdonthineni@...dia.com>,
Sinan Kaya <okaya@...nel.org>
Subject: Re: [PATCH v5 3/7] PCI: Remove reset_fn field from pci_dev
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@...hat.com>
> Reviewed-by: Raphael Norwitz <raphael.norwitz@...anix.com>
> Co-developed-by: Alex Williamson <alex.williamson@...hat.com>
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
> Signed-off-by: Amey Narkhede <ameynarkhede03@...il.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
>
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