linux-kernel - [PATCH v3 1/6] iommu/exynos: Reuse SysMMU constants for page size and order

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Date:   Thu, 14 Jul 2022 19:55:45 +0300
From:   Sam Protsenko <semen.protsenko@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Janghyuck Kim <janghyuck.kim@...sung.com>,
        Cho KyongHo <pullip.cho@...sung.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        David Virag <virag.david003@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 1/6] iommu/exynos: Reuse SysMMU constants for page size and order

Using SZ_4K in context of SysMMU driver is better than using PAGE_SIZE,
as PAGE_SIZE might have different value on different platforms. Though
it would be even better to use more specific constants, already existing
in SysMMU driver. Make the code more strict by using SPAGE_ORDER and
SPAGE_SIZE constants.

It also makes sense, as __sysmmu_tlb_invalidate_entry() also uses
SPAGE_* constants for further calculations with num_inv param, so it's
logical that num_inv should be previously calculated using also SPAGE_*
values.

Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Acked-by: Marek Szyprowski <m.szyprowski@...sung.com>
---
Changes in v3:
  - Added Marek's Acked-by tag
  - Added Krzysztof's R-b tag

Changes in v2:
  - (none) This patch is new and added in v2

 drivers/iommu/exynos-iommu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
index 79729892eb48..8f80aaa35092 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -340,7 +340,7 @@ static void __sysmmu_set_ptbase(struct sysmmu_drvdata *data, phys_addr_t pgd)
 	if (MMU_MAJ_VER(data->version) < 5)
 		writel(pgd, data->sfrbase + REG_PT_BASE_ADDR);
 	else
-		writel(pgd / SZ_4K, data->sfrbase + REG_V5_PT_BASE_PFN);
+		writel(pgd >> SPAGE_ORDER, data->sfrbase + REG_V5_PT_BASE_PFN);
 
 	__sysmmu_tlb_invalidate(data);
 }
@@ -550,7 +550,7 @@ static void sysmmu_tlb_invalidate_entry(struct sysmmu_drvdata *data,
 		 * 64KB page can be one of 16 consecutive sets.
 		 */
 		if (MMU_MAJ_VER(data->version) == 2)
-			num_inv = min_t(unsigned int, size / SZ_4K, 64);
+			num_inv = min_t(unsigned int, size / SPAGE_SIZE, 64);
 
 		if (sysmmu_block(data)) {
 			__sysmmu_tlb_invalidate_entry(data, iova, num_inv);
-- 
2.30.2