iommu/tegra: smmu: debugfs for TLB/PTC statistics

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Add debugfs entries to collect TLB/PTC statistics.

  $ echo "reset" > /sys/kernel/debug/smmu/mc/{tlb,ptc}
  $ echo "on" > /sys/kernel/debug/smmu/mc/{tlb,ptc}
  $ echo "off" > /sys/kernel/debug/smmu/mc/{tlb,ptc}
  $ cat /sys/kernel/debug/smmu/mc/{tlb,ptc}
  hit:0014910c miss:00014d22

  The above format is:
  hit:<HIT count><SPC>miss:<MISS count><SPC><CR+LF>

  fscanf(fp, "hit:%lx miss:%lx", &hit, &miss);

Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

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This commit is contained in:

Hiroshi Doyu 2012-08-02 11:46:40 +03:00 • committed by Joerg Roedel

parent 0d7614f09c

commit 39abf8aa7d

1 changed files with 190 additions and 12 deletions

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drivers/iommu/tegra-smmu.c

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