iommu/tegra: smmu: Compute PFN mask at runtime
The SMMU on Tegra30 and Tegra114 supports addressing up to 4 GiB of
physical memory. On Tegra124 the addressable physical memory was
extended to 16 GiB. The page frame number stored in PTEs therefore
requires 20 or 22 bits, depending on SoC generation.
In order to cope with this, compute the proper value at runtime.
Reported-by: Joseph Lo <josephl@nvidia.com>
Cc: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index d8418b5..76887a7 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -6,6 +6,7 @@
* published by the Free Software Foundation.
*/
+#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/iommu.h>
#include <linux/kernel.h>
@@ -24,6 +25,8 @@
struct tegra_mc *mc;
const struct tegra_smmu_soc *soc;
+ unsigned long pfn_mask;
+
unsigned long *asids;
struct mutex lock;
@@ -105,8 +108,6 @@
#define SMMU_PDE_SHIFT 22
#define SMMU_PTE_SHIFT 12
-#define SMMU_PFN_MASK 0x000fffff
-
#define SMMU_PD_READABLE (1 << 31)
#define SMMU_PD_WRITABLE (1 << 30)
#define SMMU_PD_NONSECURE (1 << 29)
@@ -486,7 +487,7 @@
smmu_flush_tlb_section(smmu, as->id, iova);
smmu_flush(smmu);
} else {
- page = pfn_to_page(pd[pde] & SMMU_PFN_MASK);
+ page = pfn_to_page(pd[pde] & smmu->pfn_mask);
pt = page_address(page);
}
@@ -508,7 +509,7 @@
u32 *pd = page_address(as->pd), *pt;
struct page *page;
- page = pfn_to_page(pd[pde] & SMMU_PFN_MASK);
+ page = pfn_to_page(pd[pde] & as->smmu->pfn_mask);
pt = page_address(page);
/*
@@ -583,7 +584,7 @@
u32 *pte;
pte = as_get_pte(as, iova, &page);
- pfn = *pte & SMMU_PFN_MASK;
+ pfn = *pte & as->smmu->pfn_mask;
return PFN_PHYS(pfn);
}
@@ -707,6 +708,10 @@
smmu->dev = dev;
smmu->mc = mc;
+ smmu->pfn_mask = BIT_MASK(mc->soc->num_address_bits - PAGE_SHIFT) - 1;
+ dev_dbg(dev, "address bits: %u, PFN mask: %#lx\n",
+ mc->soc->num_address_bits, smmu->pfn_mask);
+
value = SMMU_PTC_CONFIG_ENABLE | SMMU_PTC_CONFIG_INDEX_MAP(0x3f);
if (soc->supports_request_limit)