linux-kernel - Re: [PATCH v4 1/7] powerpc/pseries/iommu: Create defines for operations in ibm, ddw-applicable

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Message-ID: <62eb0c86eaad6e8c23ca99d011ca58cdebd53b44.camel@linux.vnet.ibm.com>
Date:   Tue, 04 Aug 2020 16:34:01 -0500
From:   David Dai <zdai@...ux.vnet.ibm.com>
To:     Leonardo Bras <leobras.c@...il.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Joel Stanley <joel@....id.au>,
        Christophe Leroy <christophe.leroy@....fr>,
        Thiago Jung Bauermann <bauerman@...ux.ibm.com>,
        Ram Pai <linuxram@...ibm.com>,
        Brian King <brking@...ux.vnet.ibm.com>
Cc:     linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/7] powerpc/pseries/iommu: Create defines for
 operations in ibm, ddw-applicable

On Thu, 2020-07-16 at 04:16 -0300, Leonardo Bras wrote:
> Create defines to help handling ibm,ddw-applicable values, avoiding
> confusion about the index of given operations.
> 
> Signed-off-by: Leonardo Bras <leobras.c@...il.com>
> ---
>  arch/powerpc/platforms/pseries/iommu.c | 43 ++++++++++++++++------
> ----
>  1 file changed, 26 insertions(+), 17 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/pseries/iommu.c
> b/arch/powerpc/platforms/pseries/iommu.c
> index 6d47b4a3ce39..ac0d6376bdad 100644
> --- a/arch/powerpc/platforms/pseries/iommu.c
> +++ b/arch/powerpc/platforms/pseries/iommu.c
> @@ -39,6 +39,14 @@
>  
>  #include "pseries.h"
>  
> +enum {
> +	DDW_QUERY_PE_DMA_WIN  = 0,
> +	DDW_CREATE_PE_DMA_WIN = 1,
> +	DDW_REMOVE_PE_DMA_WIN = 2,
> +
> +	DDW_APPLICABLE_SIZE
> +};
> +
>  static struct iommu_table_group *iommu_pseries_alloc_group(int node)
>  {
>  	struct iommu_table_group *table_group;
> @@ -771,12 +779,12 @@ static void remove_ddw(struct device_node *np,
> bool remove_prop)
>  {
>  	struct dynamic_dma_window_prop *dwp;
>  	struct property *win64;
> -	u32 ddw_avail[3];
> +	u32 ddw_avail[DDW_APPLICABLE_SIZE];
>  	u64 liobn;
>  	int ret = 0;
>  
>  	ret = of_property_read_u32_array(np, "ibm,ddw-applicable",
> -					 &ddw_avail[0], 3);
> +					 &ddw_avail[0],
> DDW_APPLICABLE_SIZE);
>  
>  	win64 = of_find_property(np, DIRECT64_PROPNAME, NULL);
>  	if (!win64)
> @@ -798,15 +806,15 @@ static void remove_ddw(struct device_node *np,
> bool remove_prop)
>  		pr_debug("%pOF successfully cleared tces in window.\n",
>  			 np);
>  
> -	ret = rtas_call(ddw_avail[2], 1, 1, NULL, liobn);
> +	ret = rtas_call(ddw_avail[DDW_REMOVE_PE_DMA_WIN], 1, 1, NULL,
> liobn);
>  	if (ret)
>  		pr_warn("%pOF: failed to remove direct window: rtas
> returned "
>  			"%d to ibm,remove-pe-dma-window(%x) %llx\n",
> -			np, ret, ddw_avail[2], liobn);
> +			np, ret, ddw_avail[DDW_REMOVE_PE_DMA_WIN],
> liobn);
>  	else
>  		pr_debug("%pOF: successfully removed direct window:
> rtas returned "
>  			"%d to ibm,remove-pe-dma-window(%x) %llx\n",
> -			np, ret, ddw_avail[2], liobn);
> +			np, ret, ddw_avail[DDW_REMOVE_PE_DMA_WIN],
> liobn);
>  
>  delprop:
>  	if (remove_prop)
> @@ -889,11 +897,11 @@ static int query_ddw(struct pci_dev *dev, const
> u32 *ddw_avail,
>  	buid = pdn->phb->buid;
>  	cfg_addr = ((pdn->busno << 16) | (pdn->devfn << 8));
>  
> -	ret = rtas_call(ddw_avail[0], 3, 5, (u32 *)query,
> -		  cfg_addr, BUID_HI(buid), BUID_LO(buid));
> +	ret = rtas_call(ddw_avail[DDW_QUERY_PE_DMA_WIN], 3, 5, (u32
> *)query,
> +			cfg_addr, BUID_HI(buid), BUID_LO(buid));
>  	dev_info(&dev->dev, "ibm,query-pe-dma-windows(%x) %x %x %x"
> -		" returned %d\n", ddw_avail[0], cfg_addr,
> BUID_HI(buid),
> -		BUID_LO(buid), ret);
> +		" returned %d\n", ddw_avail[DDW_QUERY_PE_DMA_WIN],
> cfg_addr,
> +		 BUID_HI(buid), BUID_LO(buid), ret);
>  	return ret;
>  }
>  
> @@ -920,15 +928,16 @@ static int create_ddw(struct pci_dev *dev,
> const u32 *ddw_avail,
>  
>  	do {
>  		/* extra outputs are LIOBN and dma-addr (hi, lo) */
> -		ret = rtas_call(ddw_avail[1], 5, 4, (u32 *)create,
> -				cfg_addr, BUID_HI(buid), BUID_LO(buid),
> -				page_shift, window_shift);
> +		ret = rtas_call(ddw_avail[DDW_CREATE_PE_DMA_WIN], 5, 4,
> +				(u32 *)create, cfg_addr, BUID_HI(buid),
> +				BUID_LO(buid), page_shift,
> window_shift);
>  	} while (rtas_busy_delay(ret));
>  	dev_info(&dev->dev,
>  		"ibm,create-pe-dma-window(%x) %x %x %x %x %x returned
> %d "
> -		"(liobn = 0x%x starting addr = %x %x)\n", ddw_avail[1],
> -		 cfg_addr, BUID_HI(buid), BUID_LO(buid), page_shift,
> -		 window_shift, ret, create->liobn, create->addr_hi,
> create->addr_lo);
> +		"(liobn = 0x%x starting addr = %x %x)\n",
> +		 ddw_avail[DDW_CREATE_PE_DMA_WIN], cfg_addr,
> BUID_HI(buid),
> +		 BUID_LO(buid), page_shift, window_shift, ret, create-
> >liobn,
> +		 create->addr_hi, create->addr_lo);
>  
>  	return ret;
>  }
> @@ -996,7 +1005,7 @@ static u64 enable_ddw(struct pci_dev *dev,
> struct device_node *pdn)
>  	int page_shift;
>  	u64 dma_addr, max_addr;
>  	struct device_node *dn;
> -	u32 ddw_avail[3];
> +	u32 ddw_avail[DDW_APPLICABLE_SIZE];
>  	struct direct_window *window;
>  	struct property *win64;
>  	struct dynamic_dma_window_prop *ddwprop;
> @@ -1029,7 +1038,7 @@ static u64 enable_ddw(struct pci_dev *dev,
> struct device_node *pdn)
>  	 * the property is actually in the parent, not the PE
>  	 */
>  	ret = of_property_read_u32_array(pdn, "ibm,ddw-applicable",
> -					 &ddw_avail[0], 3);
> +					 &ddw_avail[0],
> DDW_APPLICABLE_SIZE);
>  	if (ret)
>  		goto out_failed;
>  
Tested-by: David Dai <zdai@...ux.vnet.ibm.com>