Since kmalloc() does not guarantee the alignment of 1KB when it
allocates 1KB, it is required to allocate lv2 page table from
own slab that guarantees alignment of 1KB.
Signed-off-by: KyongHo Cho <pullip.cho@xxxxxxxxxxx>
---
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 4061b17..0bb194e 100644
--- a/drivers/iommu/exynos-iommu.c
+++ b/drivers/iommu/exynos-iommu.c
@@ -104,6 +104,8 @@
#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);
@@ -865,7 +867,8 @@ 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);
@@ -959,7 +962,7 @@ 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 NULL;
@@ -982,7 +985,7 @@ 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;
}
@@ -1168,10 +1171,23 @@ 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;
}
--
1.8.0
--
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