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Date:   Mon, 13 Jun 2022 09:51:33 -0500
From:   Bjorn Helgaas <helgaas@kernel.org>
To:     Meng Tang <tangmeng@uniontech.com>
Cc:     jesse.brandeburg@intel.com, anthony.l.nguyen@intel.com,
        davem@davemloft.net, kuba@kernel.org, bhelgaas@google.com,
        intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
        Vinicius Costa Gomes <vinicius.gomes@intel.com>
Subject: Re: [PATCH 5.10 1/2] commit 1d71eb53e451 ("Revert "PCI: Make
 pci_enable_ptm() private"")
Message-ID: <20220613145133.GA701092@bhelgaas>
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In-Reply-To: <20220613111907.25490-1-tangmeng@uniontech.com>
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On Mon, Jun 13, 2022 at 07:19:06PM +0800, Meng Tang wrote:
> From: Vinicius Costa Gomes <vinicius.gomes@intel.com>
> 
> Make pci_enable_ptm() accessible from the drivers.
> 
> Exposing this to the driver enables the driver to use the
> 'ptm_enabled' field of 'pci_dev' to check if PTM is enabled or not.
> 
> This reverts commit ac6c26da29c1 ("PCI: Make pci_enable_ptm() private").
> 
> In the 5.10 kernel version, even to the latest confirmed version,
> the following error will still be reported when I225-V network card
> is used.
> 
> kernel: [    1.031581] igc: probe of 0000:01:00.0 failed with error -2
> kernel: [    1.066574] igc: probe of 0000:02:00.0 failed with error -2
> kernel: [    1.096152] igc: probe of 0000:03:00.0 failed with error -2
> kernel: [    1.127251] igc: probe of 0000:04:00.0 failed with error -2
> 
> Even though I confirmed that 7c496de538eebd8212dc2a3c9a468386b2640d4
> and 47bca7de6a4fb8dcb564c7ca4d885c91ed19e03 have been merged into the
> kernel 5.10, the bug is still occurred, and the
> "commit 1b5d73fb8624 ("igc: Enable PCIe PTM")" can fixes it.
> 
> And this patch is the pre-patch of
> 1b5d73fb862414106cf270a1a7300ce8ae77de83.

I guess the point of this is to backport 1d71eb53e451 ("Revert "PCI:
Make pci_enable_ptm() private"") to a v5.10 stable kernel?

If so, I would think you'd want to send this to
stable@vger.kernel.org.

> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
> Signed-off-by: Meng Tang <tangmeng@uniontech.com>
> ---
>  drivers/pci/pci.h   | 3 ---
>  include/linux/pci.h | 7 +++++++
>  2 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index a96dc6f53076..4084764bf0b1 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -585,11 +585,8 @@ static inline void pcie_ecrc_get_policy(char *str) { }
>  
>  #ifdef CONFIG_PCIE_PTM
>  void pci_ptm_init(struct pci_dev *dev);
> -int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
>  #else
>  static inline void pci_ptm_init(struct pci_dev *dev) { }
> -static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
> -{ return -EINVAL; }
>  #endif
>  
>  struct pci_dev_reset_methods {
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index bc5a1150f072..692ce678c5f1 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1599,6 +1599,13 @@ static inline bool pci_aer_available(void) { return false; }
>  
>  bool pci_ats_disabled(void);
>  
> +#ifdef CONFIG_PCIE_PTM
> +int pci_enable_ptm(struct pci_dev *dev, u8 *granularity);
> +#else
> +static inline int pci_enable_ptm(struct pci_dev *dev, u8 *granularity)
> +{ return -EINVAL; }
> +#endif
> +
>  void pci_cfg_access_lock(struct pci_dev *dev);
>  bool pci_cfg_access_trylock(struct pci_dev *dev);
>  void pci_cfg_access_unlock(struct pci_dev *dev);
> -- 
> 2.20.1
> 
> 
>