GART has a fixed aperture size, hence the number of pages is constant.
Signed-off-by: Dmitry Osipenko <dig...@gmail.com>
---
drivers/iommu/tegra-gart.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/tegra-gart.c b/drivers/iommu/tegra-gart.c
index 89ec24c6952c..4a0607669d34 100644
--- a/drivers/iommu/tegra-gart.c
+++ b/drivers/iommu/tegra-gart.c
@@ -33,6 +33,8 @@
#include <asm/cacheflush.h>
+#define GART_APERTURE_SIZE SZ_32M
+
/* bitmap of the page sizes currently supported */
#define GART_IOMMU_PGSIZES (SZ_4K)
@@ -47,6 +49,8 @@
#define GART_PAGE_MASK \
(~(GART_PAGE_SIZE - 1) & ~GART_ENTRY_PHYS_ADDR_VALID)
+#define GART_PAGECOUNT (GART_APERTURE_SIZE >> GART_PAGE_SHIFT)
+
struct gart_client {
struct device *dev;
struct list_head list;
@@ -55,7 +59,6 @@ struct gart_client {
struct gart_device {
void __iomem *regs;
u32 *savedata;
- u32 page_count; /* total remappable size */
dma_addr_t iovmm_base; /* offset to vmm_area */
spinlock_t pte_lock; /* for pagetable */
struct list_head client;
@@ -91,7 +94,7 @@ static struct gart_domain *to_gart_domain(struct iommu_domain
*dom)
#define for_each_gart_pte(gart, iova) \
for (iova = gart->iovmm_base; \
- iova < gart->iovmm_base + GART_PAGE_SIZE * gart->page_count; \
+ iova < gart->iovmm_base + GART_APERTURE_SIZE; \
iova += GART_PAGE_SIZE)
static inline void gart_set_pte(struct gart_device *gart,
@@ -158,7 +161,7 @@ static inline bool gart_iova_range_valid(struct gart_device
*gart,
iova_start = iova;
iova_end = iova_start + bytes - 1;
gart_start = gart->iovmm_base;
- gart_end = gart_start + gart->page_count * GART_PAGE_SIZE - 1;
+ gart_end = gart_start + GART_APERTURE_SIZE - 1;
if (iova_start < gart_start)
return false;
@@ -241,7 +244,7 @@ static struct iommu_domain
*gart_iommu_domain_alloc(unsigned type)
gart_domain->gart = gart;
gart_domain->domain.geometry.aperture_start = gart->iovmm_base;
gart_domain->domain.geometry.aperture_end = gart->iovmm_base +
- gart->page_count * GART_PAGE_SIZE - 1;
+ GART_APERTURE_SIZE - 1;
gart_domain->domain.geometry.force_aperture = true;
return &gart_domain->domain;
@@ -463,9 +466,8 @@ static int tegra_gart_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&gart->client);
gart->regs = gart_regs;
gart->iovmm_base = (dma_addr_t)res_remap->start;
- gart->page_count = (resource_size(res_remap) >> GART_PAGE_SHIFT);
- gart->savedata = vmalloc(sizeof(u32) * gart->page_count);
+ gart->savedata = vmalloc(sizeof(u32) * GART_PAGECOUNT);
if (!gart->savedata) {
dev_err(dev, "failed to allocate context save area\n");
return -ENOMEM;
--
2.16.3
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