linux-kernel - Re: [PATCH 1/2] PCI: altera: Fix configuration type based on secondary number

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Date:   Thu, 30 May 2019 16:25:48 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Ley Foon Tan <ley.foon.tan@...el.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, lftan.linux@...il.com
Subject: Re: [PATCH 1/2] PCI: altera: Fix configuration type based on
 secondary number

On Fri, May 24, 2019 at 02:07:25PM +0800, Ley Foon Tan wrote:
> This fix issue when access config from PCIe switch.
> 
> Stratix 10 PCIe controller does not support Type 1 to Type 0 conversion
> as previous version (V1) does.
> 
> The PCIe controller need to send Type 0 config TLP if the targeting bus
> matches with the secondary bus number, which is when the TLP is targeting
> the immediate device on the link.
> 
> The PCIe controller send Type 1 config TLP if the targeting bus is
> larger than the secondary bus, which is when the TLP is targeting the
> device not immediate on the link.
> 
> Signed-off-by: Ley Foon Tan <ley.foon.tan@...el.com>
> ---
>  drivers/pci/controller/pcie-altera.c | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-altera.c b/drivers/pci/controller/pcie-altera.c
> index 27222071ace7..047bcc214f9b 100644
> --- a/drivers/pci/controller/pcie-altera.c
> +++ b/drivers/pci/controller/pcie-altera.c
> @@ -44,6 +44,8 @@
>  #define S10_RP_RXCPL_STATUS		0x200C
>  #define S10_RP_CFG_ADDR(pcie, reg)	\
>  	(((pcie)->hip_base) + (reg) + (1 << 20))
> +#define S10_RP_SECONDARY(pcie)		\
> +	readb(S10_RP_CFG_ADDR(pcie, PCI_SECONDARY_BUS))
>  
>  /* TLP configuration type 0 and 1 */
>  #define TLP_FMTTYPE_CFGRD0		0x04	/* Configuration Read Type 0 */
> @@ -63,6 +65,14 @@
>  	((((bus == pcie->root_bus_nr) ? pcie->pcie_data->cfgwr0		\
>  				: pcie->pcie_data->cfgwr1) << 24) |	\
>  				TLP_PAYLOAD_SIZE)
> +#define S10_TLP_CFGRD_DW0(pcie, bus)					\
> +	(((((bus) > S10_RP_SECONDARY(pcie)) ? pcie->pcie_data->cfgrd0	\
> +				: pcie->pcie_data->cfgrd1) << 24) |	\
> +				TLP_PAYLOAD_SIZE)
> +#define S10_TLP_CFGWR_DW0(pcie, bus)					\
> +	(((((bus) > S10_RP_SECONDARY(pcie)) ? pcie->pcie_data->cfgwr0	\
> +				: pcie->pcie_data->cfgwr1) << 24) |	\
> +				TLP_PAYLOAD_SIZE)
>  #define TLP_CFG_DW1(pcie, tag, be)	\
>  	(((TLP_REQ_ID(pcie->root_bus_nr,  RP_DEVFN)) << 16) | (tag << 8) | (be))
>  #define TLP_CFG_DW2(bus, devfn, offset)	\
> @@ -327,7 +337,11 @@ static int tlp_cfg_dword_read(struct altera_pcie *pcie, u8 bus, u32 devfn,
>  {
>  	u32 headers[TLP_HDR_SIZE];
>  
> -	headers[0] = TLP_CFGRD_DW0(pcie, bus);
> +	if (pcie->pcie_data->version == ALTERA_PCIE_V1)
> +		headers[0] = TLP_CFGRD_DW0(pcie, bus);
> +	else
> +		headers[0] = S10_TLP_CFGRD_DW0(pcie, bus);
> +
>  	headers[1] = TLP_CFG_DW1(pcie, TLP_READ_TAG, byte_en);
>  	headers[2] = TLP_CFG_DW2(bus, devfn, where);
>  
> @@ -342,7 +356,11 @@ static int tlp_cfg_dword_write(struct altera_pcie *pcie, u8 bus, u32 devfn,
>  	u32 headers[TLP_HDR_SIZE];
>  	int ret;
>  
> -	headers[0] = TLP_CFGWR_DW0(pcie, bus);
> +	if (pcie->pcie_data->version == ALTERA_PCIE_V1)
> +		headers[0] = TLP_CFGWR_DW0(pcie, bus);
> +	else
> +		headers[0] = S10_TLP_CFGWR_DW0(pcie, bus);
> +

Why don't you rewrite all these macros as an eg:

static inline u32 get_tlp_header()
{}

where you can also handle the version and everything needed to
detect what header should be set-up ?

Lorenzo

>  	headers[1] = TLP_CFG_DW1(pcie, TLP_WRITE_TAG, byte_en);
>  	headers[2] = TLP_CFG_DW2(bus, devfn, where);
>  
> -- 
> 2.19.0
>