netdev - Re: [PATCH mlx5-next 1/2] PCI/TPH: Expose pcie_tph_get_st_table

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Message-ID: <20251103154359.GA1806626@bhelgaas>
Date: Mon, 3 Nov 2025 09:43:59 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Leon Romanovsky <leon@...nel.org>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>, Saeed Mahameed <saeedm@...dia.com>,
	Tariq Toukan <tariqt@...dia.com>, Mark Bloch <mbloch@...dia.com>,
	Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
	Yishai Hadas <yishaih@...dia.com>,
	Edward Srouji <edwards@...dia.com>
Subject: Re: [PATCH mlx5-next 1/2] PCI/TPH: Expose pcie_tph_get_st_table_loc()

On Mon, Oct 27, 2025 at 11:34:01AM +0200, Leon Romanovsky wrote:
> From: Yishai Hadas <yishaih@...dia.com>
> 
> Expose pcie_tph_get_st_table_loc() to be used by drivers as will be done
> in the next patch from the series.
> 
> Signed-off-by: Yishai Hadas <yishaih@...dia.com>
> Signed-off-by: Edward Srouji <edwards@...dia.com>
> Signed-off-by: Leon Romanovsky <leonro@...dia.com>
> ---
>  drivers/pci/tph.c       | 7 ++++---
>  include/linux/pci-tph.h | 1 +
>  2 files changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/pci/tph.c b/drivers/pci/tph.c
> index cc64f93709a4..8f8457ec9adb 100644
> --- a/drivers/pci/tph.c
> +++ b/drivers/pci/tph.c
> @@ -155,7 +155,7 @@ static u8 get_st_modes(struct pci_dev *pdev)
>  	return reg;
>  }
>  
> -static u32 get_st_table_loc(struct pci_dev *pdev)
> +u32 pcie_tph_get_st_table_loc(struct pci_dev *pdev)
>  {
>  	u32 reg;
>  
> @@ -163,6 +163,7 @@ static u32 get_st_table_loc(struct pci_dev *pdev)
>  
>  	return FIELD_GET(PCI_TPH_CAP_LOC_MASK, reg);
>  }
> +EXPORT_SYMBOL(pcie_tph_get_st_table_loc);

OK by me, but I think we should add kernel-doc for the return value.

With that doc added:

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>


>  /*
>   * Return the size of ST table. If ST table is not in TPH Requester Extended
> @@ -174,7 +175,7 @@ u16 pcie_tph_get_st_table_size(struct pci_dev *pdev)
>  	u32 loc;
>  
>  	/* Check ST table location first */
> -	loc = get_st_table_loc(pdev);
> +	loc = pcie_tph_get_st_table_loc(pdev);
>  
>  	/* Convert loc to match with PCI_TPH_LOC_* defined in pci_regs.h */
>  	loc = FIELD_PREP(PCI_TPH_CAP_LOC_MASK, loc);
> @@ -299,7 +300,7 @@ int pcie_tph_set_st_entry(struct pci_dev *pdev, unsigned int index, u16 tag)
>  	 */
>  	set_ctrl_reg_req_en(pdev, PCI_TPH_REQ_DISABLE);
>  
> -	loc = get_st_table_loc(pdev);
> +	loc = pcie_tph_get_st_table_loc(pdev);
>  	/* Convert loc to match with PCI_TPH_LOC_* */
>  	loc = FIELD_PREP(PCI_TPH_CAP_LOC_MASK, loc);
>  
> diff --git a/include/linux/pci-tph.h b/include/linux/pci-tph.h
> index 9e4e331b1603..ba28140ce670 100644
> --- a/include/linux/pci-tph.h
> +++ b/include/linux/pci-tph.h
> @@ -29,6 +29,7 @@ int pcie_tph_get_cpu_st(struct pci_dev *dev,
>  void pcie_disable_tph(struct pci_dev *pdev);
>  int pcie_enable_tph(struct pci_dev *pdev, int mode);
>  u16 pcie_tph_get_st_table_size(struct pci_dev *pdev);
> +u32 pcie_tph_get_st_table_loc(struct pci_dev *pdev);
>  #else
>  static inline int pcie_tph_set_st_entry(struct pci_dev *pdev,
>  					unsigned int index, u16 tag)
> 
> -- 
> 2.51.0
>