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Date:   Thu, 26 Nov 2020 16:09:46 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Yong Wu <yong.wu@...iatek.com>, Joerg Roedel <joro@...tes.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>, Will Deacon <will@...nel.org>
Cc:     youlin.pei@...iatek.com, devicetree@...r.kernel.org,
        Nicolas Boichat <drinkcat@...omium.org>,
        srv_heupstream@...iatek.com, chao.hao@...iatek.com,
        kernel-team@...roid.com, linux-kernel@...r.kernel.org,
        Evan Green <evgreen@...omium.org>,
        Tomasz Figa <tfiga@...gle.com>,
        iommu@...ts.linux-foundation.org,
        linux-mediatek@...ts.infradead.org,
        Krzysztof Kozlowski <krzk@...nel.org>, anan.sun@...iatek.com,
        Greg Kroah-Hartman <gregkh@...gle.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 10/24] iommu/io-pgtable-arm-v7s: Add cfg as a param in
 some macros

On 2020-11-11 12:38, Yong Wu wrote:
> Add "cfg" as a parameter for some macros. This is a preparing patch for
> mediatek extend the lvl1 pgtable. No functional change.

Reviewed-by: Robin Murphy <robin.murphy@....com>

> Signed-off-by: Yong Wu <yong.wu@...iatek.com>
> Acked-by: Will Deacon <will@...nel.org>
> ---
>   drivers/iommu/io-pgtable-arm-v7s.c | 36 +++++++++++++++---------------
>   1 file changed, 18 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/iommu/io-pgtable-arm-v7s.c b/drivers/iommu/io-pgtable-arm-v7s.c
> index 58cc201c10a3..0b3c5b904ddc 100644
> --- a/drivers/iommu/io-pgtable-arm-v7s.c
> +++ b/drivers/iommu/io-pgtable-arm-v7s.c
> @@ -47,21 +47,21 @@
>    * and 12 bits in a page.
>    */
>   #define ARM_V7S_ADDR_BITS		32
> -#define _ARM_V7S_LVL_BITS(lvl)		((lvl) == 1 ? 12 : 8)
> +#define _ARM_V7S_LVL_BITS(lvl, cfg)	((lvl) == 1 ? 12 : 8)
>   #define ARM_V7S_LVL_SHIFT(lvl)		((lvl) == 1 ? 20 : 12)
>   #define ARM_V7S_TABLE_SHIFT		10
>   
> -#define ARM_V7S_PTES_PER_LVL(lvl)	(1 << _ARM_V7S_LVL_BITS(lvl))
> -#define ARM_V7S_TABLE_SIZE(lvl)						\
> -	(ARM_V7S_PTES_PER_LVL(lvl) * sizeof(arm_v7s_iopte))
> +#define ARM_V7S_PTES_PER_LVL(lvl, cfg)	(1 << _ARM_V7S_LVL_BITS(lvl, cfg))
> +#define ARM_V7S_TABLE_SIZE(lvl, cfg)						\
> +	(ARM_V7S_PTES_PER_LVL(lvl, cfg) * sizeof(arm_v7s_iopte))
>   
>   #define ARM_V7S_BLOCK_SIZE(lvl)		(1UL << ARM_V7S_LVL_SHIFT(lvl))
>   #define ARM_V7S_LVL_MASK(lvl)		((u32)(~0U << ARM_V7S_LVL_SHIFT(lvl)))
>   #define ARM_V7S_TABLE_MASK		((u32)(~0U << ARM_V7S_TABLE_SHIFT))
> -#define _ARM_V7S_IDX_MASK(lvl)		(ARM_V7S_PTES_PER_LVL(lvl) - 1)
> -#define ARM_V7S_LVL_IDX(addr, lvl)	({				\
> +#define _ARM_V7S_IDX_MASK(lvl, cfg)	(ARM_V7S_PTES_PER_LVL(lvl, cfg) - 1)
> +#define ARM_V7S_LVL_IDX(addr, lvl, cfg)	({				\
>   	int _l = lvl;							\
> -	((u32)(addr) >> ARM_V7S_LVL_SHIFT(_l)) & _ARM_V7S_IDX_MASK(_l); \
> +	((u32)(addr) >> ARM_V7S_LVL_SHIFT(_l)) & _ARM_V7S_IDX_MASK(_l, cfg); \
>   })
>   
>   /*
> @@ -237,7 +237,7 @@ static void *__arm_v7s_alloc_table(int lvl, gfp_t gfp,
>   	struct device *dev = cfg->iommu_dev;
>   	phys_addr_t phys;
>   	dma_addr_t dma;
> -	size_t size = ARM_V7S_TABLE_SIZE(lvl);
> +	size_t size = ARM_V7S_TABLE_SIZE(lvl, cfg);
>   	void *table = NULL;
>   
>   	if (lvl == 1)
> @@ -283,7 +283,7 @@ static void __arm_v7s_free_table(void *table, int lvl,
>   {
>   	struct io_pgtable_cfg *cfg = &data->iop.cfg;
>   	struct device *dev = cfg->iommu_dev;
> -	size_t size = ARM_V7S_TABLE_SIZE(lvl);
> +	size_t size = ARM_V7S_TABLE_SIZE(lvl, cfg);
>   
>   	if (!cfg->coherent_walk)
>   		dma_unmap_single(dev, __arm_v7s_dma_addr(table), size,
> @@ -427,7 +427,7 @@ static int arm_v7s_init_pte(struct arm_v7s_io_pgtable *data,
>   			arm_v7s_iopte *tblp;
>   			size_t sz = ARM_V7S_BLOCK_SIZE(lvl);
>   
> -			tblp = ptep - ARM_V7S_LVL_IDX(iova, lvl);
> +			tblp = ptep - ARM_V7S_LVL_IDX(iova, lvl, cfg);
>   			if (WARN_ON(__arm_v7s_unmap(data, NULL, iova + i * sz,
>   						    sz, lvl, tblp) != sz))
>   				return -EINVAL;
> @@ -480,7 +480,7 @@ static int __arm_v7s_map(struct arm_v7s_io_pgtable *data, unsigned long iova,
>   	int num_entries = size >> ARM_V7S_LVL_SHIFT(lvl);
>   
>   	/* Find our entry at the current level */
> -	ptep += ARM_V7S_LVL_IDX(iova, lvl);
> +	ptep += ARM_V7S_LVL_IDX(iova, lvl, cfg);
>   
>   	/* If we can install a leaf entry at this level, then do so */
>   	if (num_entries)
> @@ -553,7 +553,7 @@ static void arm_v7s_free_pgtable(struct io_pgtable *iop)
>   	struct arm_v7s_io_pgtable *data = io_pgtable_to_data(iop);
>   	int i;
>   
> -	for (i = 0; i < ARM_V7S_PTES_PER_LVL(1); i++) {
> +	for (i = 0; i < ARM_V7S_PTES_PER_LVL(1, &data->iop.cfg); i++) {
>   		arm_v7s_iopte pte = data->pgd[i];
>   
>   		if (ARM_V7S_PTE_IS_TABLE(pte, 1))
> @@ -605,9 +605,9 @@ static size_t arm_v7s_split_blk_unmap(struct arm_v7s_io_pgtable *data,
>   	if (!tablep)
>   		return 0; /* Bytes unmapped */
>   
> -	num_ptes = ARM_V7S_PTES_PER_LVL(2);
> +	num_ptes = ARM_V7S_PTES_PER_LVL(2, cfg);
>   	num_entries = size >> ARM_V7S_LVL_SHIFT(2);
> -	unmap_idx = ARM_V7S_LVL_IDX(iova, 2);
> +	unmap_idx = ARM_V7S_LVL_IDX(iova, 2, cfg);
>   
>   	pte = arm_v7s_prot_to_pte(arm_v7s_pte_to_prot(blk_pte, 1), 2, cfg);
>   	if (num_entries > 1)
> @@ -649,7 +649,7 @@ static size_t __arm_v7s_unmap(struct arm_v7s_io_pgtable *data,
>   	if (WARN_ON(lvl > 2))
>   		return 0;
>   
> -	idx = ARM_V7S_LVL_IDX(iova, lvl);
> +	idx = ARM_V7S_LVL_IDX(iova, lvl, &iop->cfg);
>   	ptep += idx;
>   	do {
>   		pte[i] = READ_ONCE(ptep[i]);
> @@ -735,7 +735,7 @@ static phys_addr_t arm_v7s_iova_to_phys(struct io_pgtable_ops *ops,
>   	u32 mask;
>   
>   	do {
> -		ptep += ARM_V7S_LVL_IDX(iova, ++lvl);
> +		ptep += ARM_V7S_LVL_IDX(iova, ++lvl, &data->iop.cfg);
>   		pte = READ_ONCE(*ptep);
>   		ptep = iopte_deref(pte, lvl, data);
>   	} while (ARM_V7S_PTE_IS_TABLE(pte, lvl));
> @@ -778,8 +778,8 @@ static struct io_pgtable *arm_v7s_alloc_pgtable(struct io_pgtable_cfg *cfg,
>   
>   	spin_lock_init(&data->split_lock);
>   	data->l2_tables = kmem_cache_create("io-pgtable_armv7s_l2",
> -					    ARM_V7S_TABLE_SIZE(2),
> -					    ARM_V7S_TABLE_SIZE(2),
> +					    ARM_V7S_TABLE_SIZE(2, cfg),
> +					    ARM_V7S_TABLE_SIZE(2, cfg),
>   					    ARM_V7S_TABLE_SLAB_FLAGS, NULL);
>   	if (!data->l2_tables)
>   		goto out_free_data;
> 

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