diff options
| author | Thierry Reding <treding@nvidia.com> | 2015-08-06 14:20:31 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-09-29 19:26:14 +0200 |
| commit | 1f398b31044845397b5e2fefdb7ac247180e6a7c (patch) | |
| tree | 994359543f48ebee8d0fc61719c980b785641759 /drivers/memory | |
| parent | fb2908b509749657cab5f7dbda2f24add8668969 (diff) | |
iommu/tegra-smmu: Parameterize number of TLB lines
commit 11cec15bf3fb498206ef63b1fa26c27689e02d0e upstream.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/memory')
| -rw-r--r-- | drivers/memory/tegra/tegra114.c | 1 | ||||
| -rw-r--r-- | drivers/memory/tegra/tegra124.c | 1 | ||||
| -rw-r--r-- | drivers/memory/tegra/tegra30.c | 1 |
3 files changed, 3 insertions, 0 deletions
diff --git a/drivers/memory/tegra/tegra114.c b/drivers/memory/tegra/tegra114.c index 511e9a25c151..16c4d26f51e7 100644 --- a/drivers/memory/tegra/tegra114.c +++ b/drivers/memory/tegra/tegra114.c @@ -935,6 +935,7 @@ 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, .ops = &tegra114_smmu_ops, }; diff --git a/drivers/memory/tegra/tegra124.c b/drivers/memory/tegra/tegra124.c index 278d40b854c1..b153d0b732cf 100644 --- a/drivers/memory/tegra/tegra124.c +++ b/drivers/memory/tegra/tegra124.c @@ -981,6 +981,7 @@ static const struct tegra_smmu_soc tegra124_smmu_soc = { .num_swgroups = ARRAY_SIZE(tegra124_swgroups), .supports_round_robin_arbitration = true, .supports_request_limit = true, + .num_tlb_lines = 32, .num_asids = 128, .ops = &tegra124_smmu_ops, }; diff --git a/drivers/memory/tegra/tegra30.c b/drivers/memory/tegra/tegra30.c index 71fe9376fe53..f422b18f45f3 100644 --- a/drivers/memory/tegra/tegra30.c +++ b/drivers/memory/tegra/tegra30.c @@ -957,6 +957,7 @@ 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, .ops = &tegra30_smmu_ops, }; |