diff options
Diffstat (limited to 'patches.tizen/0018-iommu-exynos-allocate-lv2-page-table-from-own-slab.patch')
| -rw-r--r-- | patches.tizen/0018-iommu-exynos-allocate-lv2-page-table-from-own-slab.patch | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/patches.tizen/0018-iommu-exynos-allocate-lv2-page-table-from-own-slab.patch b/patches.tizen/0018-iommu-exynos-allocate-lv2-page-table-from-own-slab.patch new file mode 100644 index 00000000000..bb5a914a409 --- /dev/null +++ b/patches.tizen/0018-iommu-exynos-allocate-lv2-page-table-from-own-slab.patch @@ -0,0 +1,84 @@ +From 429942a268e534b39ddbe819cbd8c5641c7bbf38 Mon Sep 17 00:00:00 2001 +From: Cho KyongHo <pullip.cho@samsung.com> +Date: Fri, 26 Jul 2013 20:27:29 +0900 +Subject: [PATCH 0018/1302] iommu/exynos: allocate lv2 page table from own slab + +Since kmalloc() does not guarantee that the allignment of 1KiB when it +allocates 1KiB, it is required to allocate lv2 page table from own +slab that guarantees alignment of 1KiB + +Signed-off-by: Cho KyongHo <pullip.cho@samsung.com> +Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com> +--- + drivers/iommu/exynos-iommu.c | 24 ++++++++++++++++++++---- + 1 file changed, 20 insertions(+), 4 deletions(-) + +diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c +index 6c4ecce..093eea5 100644 +--- a/drivers/iommu/exynos-iommu.c ++++ b/drivers/iommu/exynos-iommu.c +@@ -100,6 +100,8 @@ + #define REG_PB1_SADDR 0x054 + #define REG_PB1_EADDR 0x058 + ++static struct kmem_cache *lv2table_kmem_cache; ++ + static unsigned long *section_entry(unsigned long *pgtable, unsigned long iova) + { + return pgtable + lv1ent_offset(iova); +@@ -765,7 +767,8 @@ static void exynos_iommu_domain_destroy(struct iommu_domain *domain) + + for (i = 0; i < NUM_LV1ENTRIES; i++) + if (lv1ent_page(priv->pgtable + i)) +- kfree(__va(lv2table_base(priv->pgtable + i))); ++ kmem_cache_free(lv2table_kmem_cache, ++ __va(lv2table_base(priv->pgtable + i))); + + free_pages((unsigned long)priv->pgtable, 2); + free_pages((unsigned long)priv->lv2entcnt, 1); +@@ -859,7 +862,7 @@ static unsigned long *alloc_lv2entry(unsigned long *sent, unsigned long iova, + if (lv1ent_fault(sent)) { + unsigned long *pent; + +- pent = kzalloc(LV2TABLE_SIZE, GFP_ATOMIC); ++ pent = kmem_cache_zalloc(lv2table_kmem_cache, GFP_ATOMIC); + BUG_ON((unsigned long)pent & (LV2TABLE_SIZE - 1)); + if (!pent) + return ERR_PTR(-ENOMEM); +@@ -884,7 +887,7 @@ static int lv1set_section(unsigned long *sent, phys_addr_t paddr, short *pgcnt) + if (*pgcnt != NUM_LV2ENTRIES) + return -EADDRINUSE; + +- kfree(page_entry(sent, 0)); ++ kmem_cache_free(lv2table_kmem_cache, page_entry(sent, 0)); + + *pgcnt = 0; + } +@@ -1092,10 +1095,23 @@ static int __init exynos_iommu_init(void) + { + int ret; + ++ lv2table_kmem_cache = kmem_cache_create("exynos-iommu-lv2table", ++ LV2TABLE_SIZE, LV2TABLE_SIZE, 0, NULL); ++ if (!lv2table_kmem_cache) { ++ pr_err("%s: Failed to create kmem cache\n", __func__); ++ return -ENOMEM; ++ } ++ + ret = platform_driver_register(&exynos_sysmmu_driver); + + if (ret == 0) +- bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); ++ ret = bus_set_iommu(&platform_bus_type, &exynos_iommu_ops); ++ ++ if (ret) { ++ pr_err("%s: Failed to register exynos-iommu driver.\n", ++ __func__); ++ kmem_cache_destroy(lv2table_kmem_cache); ++ } + + return ret; + } +-- +1.8.3.2 + |