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authorThierry Reding <treding@nvidia.com>2015-08-06 14:20:31 +0200
committerThierry Reding <treding@nvidia.com>2015-08-13 17:05:28 +0200
commit11cec15bf3fb498206ef63b1fa26c27689e02d0e (patch)
tree330bd3eff26a1915e86b5e896cdee4db2c909896
parent4080e99b8341f81c4ed1e17d8ef44d171c473a1b (diff)
iommu/tegra-smmu: Parameterize number of TLB lines
The number of TLB lines was increased from 16 on Tegra30 to 32 on Tegra114 and later. Parameterize the value so that the initial default can be set accordingly. On Tegra30, initializing the value to 32 would effectively disable the TLB and hence cause massive latencies for memory accesses translated through the SMMU. This is especially noticeable for isochronuous clients such as display, whose FIFOs would continuously underrun. Fixes: 891846516317 ("memory: Add NVIDIA Tegra memory controller support") Signed-off-by: Thierry Reding <treding@nvidia.com>
-rw-r--r--drivers/iommu/tegra-smmu.c9
-rw-r--r--drivers/memory/tegra/tegra114.c1
-rw-r--r--drivers/memory/tegra/tegra124.c1
-rw-r--r--drivers/memory/tegra/tegra30.c1
-rw-r--r--include/soc/tegra/mc.h1
5 files changed, 11 insertions, 2 deletions
diff --git a/drivers/iommu/tegra-smmu.c b/drivers/iommu/tegra-smmu.c
index 2f1481ad4aa5..9305964250ac 100644
--- a/drivers/iommu/tegra-smmu.c
+++ b/drivers/iommu/tegra-smmu.c
@@ -27,6 +27,7 @@ struct tegra_smmu {
const struct tegra_smmu_soc *soc;
unsigned long pfn_mask;
+ unsigned long tlb_mask;
unsigned long *asids;
struct mutex lock;
@@ -70,7 +71,8 @@ static inline u32 smmu_readl(struct tegra_smmu *smmu, unsigned long offset)
#define SMMU_TLB_CONFIG 0x14
#define SMMU_TLB_CONFIG_HIT_UNDER_MISS (1 << 29)
#define SMMU_TLB_CONFIG_ROUND_ROBIN_ARBITRATION (1 << 28)
-#define SMMU_TLB_CONFIG_ACTIVE_LINES(x) ((x) & 0x3f)
+#define SMMU_TLB_CONFIG_ACTIVE_LINES(smmu) \
+ ((smmu)->soc->num_tlb_lines & (smmu)->tlb_mask)
#define SMMU_PTC_CONFIG 0x18
#define SMMU_PTC_CONFIG_ENABLE (1 << 29)
@@ -901,6 +903,9 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
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);
+ smmu->tlb_mask = (smmu->soc->num_tlb_lines << 1) - 1;
+ dev_dbg(dev, "TLB lines: %u, mask: %#lx\n", smmu->soc->num_tlb_lines,
+ smmu->tlb_mask);
value = SMMU_PTC_CONFIG_ENABLE | SMMU_PTC_CONFIG_INDEX_MAP(0x3f);
@@ -910,7 +915,7 @@ struct tegra_smmu *tegra_smmu_probe(struct device *dev,
smmu_writel(smmu, value, SMMU_PTC_CONFIG);
value = SMMU_TLB_CONFIG_HIT_UNDER_MISS |
- SMMU_TLB_CONFIG_ACTIVE_LINES(0x20);
+ SMMU_TLB_CONFIG_ACTIVE_LINES(smmu);
if (soc->supports_round_robin_arbitration)
value |= SMMU_TLB_CONFIG_ROUND_ROBIN_ARBITRATION;
diff --git a/drivers/memory/tegra/tegra114.c b/drivers/memory/tegra/tegra114.c
index 7122f39be9cc..8053f70dbfd1 100644
--- a/drivers/memory/tegra/tegra114.c
+++ b/drivers/memory/tegra/tegra114.c
@@ -919,6 +919,7 @@ static const struct tegra_smmu_soc tegra114_smmu_soc = {
.num_swgroups = ARRAY_SIZE(tegra114_swgroups),
.supports_round_robin_arbitration = false,
.supports_request_limit = false,
+ .num_tlb_lines = 32,
.num_asids = 4,
};
diff --git a/drivers/memory/tegra/tegra124.c b/drivers/memory/tegra/tegra124.c
index ebda63283853..7d734befe0ed 100644
--- a/drivers/memory/tegra/tegra124.c
+++ b/drivers/memory/tegra/tegra124.c
@@ -1029,6 +1029,7 @@ static const struct tegra_smmu_soc tegra132_smmu_soc = {
.num_swgroups = ARRAY_SIZE(tegra124_swgroups),
.supports_round_robin_arbitration = true,
.supports_request_limit = true,
+ .num_tlb_lines = 32,
.num_asids = 128,
};
diff --git a/drivers/memory/tegra/tegra30.c b/drivers/memory/tegra/tegra30.c
index 3cb30b69d95b..7e0694d80edb 100644
--- a/drivers/memory/tegra/tegra30.c
+++ b/drivers/memory/tegra/tegra30.c
@@ -941,6 +941,7 @@ static const struct tegra_smmu_soc tegra30_smmu_soc = {
.num_swgroups = ARRAY_SIZE(tegra30_swgroups),
.supports_round_robin_arbitration = false,
.supports_request_limit = false,
+ .num_tlb_lines = 16,
.num_asids = 4,
};
diff --git a/include/soc/tegra/mc.h b/include/soc/tegra/mc.h
index d6c3190ec852..8cb3a7ecd6f8 100644
--- a/include/soc/tegra/mc.h
+++ b/include/soc/tegra/mc.h
@@ -61,6 +61,7 @@ struct tegra_smmu_soc {
bool supports_round_robin_arbitration;
bool supports_request_limit;
+ unsigned int num_tlb_lines;
unsigned int num_asids;
};

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