kernel_samsung_msm8974/Documentation/arm/msm/kgsl-sysfs.txt

This document lists details for the device specific sysfs attributes
created by the KGSL GPU driver.

- /sys/devices/platform/kgsl/vmalloc
  The total amount of vmalloc()ed memory currently allocated by the driver
  (in bytes)

- /sys/devices/platform/kgsl/vmalloc_max
  The maximum amount of vmalloc()ed memory allocated at any one
  time by the driver since the system was booted (in bytes)

- /sys/devices/platform/kgsl/coherent
  The total amount of coherent DMA memory currently allocated by the driver
  (in bytes)

- /sys/devices/platform/kgsl/coherent_max
  The maximum amount of coherent DMA memory allocated at any one
  time by the driver since the system was booted (in bytes)


- /sys/devices/platform/kgsl/histogram
  A histogram of the sizes of vmalloc allocations by the driver
  since the system was booted.  The allocations are grouped by the order
  of the allocation size in pages.  For example, order 0 are 1 page
  allocations, order 1 are 2 page allocations, order 2 are 4 page allocations,
  and so forth, up to order 16 (32768) pages.

- /sys/devices/platform/kgsl/proc
  This directory contains individual entries for each active rendering
  process.  Rendering instances are created for each unique process that
  opens the GPU devices, and are named for the id of the creating process.
  In the driver, memory allocations are owned by the process that allocates
  them, and outstanding memory is garbage collected when the process closes
  the device.

  - /sys/devices/platform/kgsl/proc/NN/vmalloc
    The total amount of vmalloc memory currently allocated by the process
    (in bytes)

  - /sys/devices/platform/kgsl/proc/NN/vmalloc_max
    The maximum amount of vmalloc memory allocated at any one
    time by the process since it was created (in bytes)

  - /sys/devices/platform/kgsl/proc/NN/exmem
    The total amount of external memory devices currently mapped by the process
    (in bytes).  This includes PMEM, ASHMEM and external memory pointers from
    userspace.

  - /sys/devices/platform/kgsl/proc/NN/exmem_max
    The maximum amount of external memory devices allocated at any one
    time by the process since it was created (in bytes).  This includes PMEM,
    ASHMEM and external memory pointers from userspace.

  - /sys/devices/platform/kgsl/proc/NN/flushes
    The total number of cache flushes performed by this process since it
    was created.

- /sys/devices/platform/kgsl/pagetables
  This directory contains individual entries for each active pagetable.
  There will always be a global pagetable with ID 0.  If per-process
  pagetables are not enabled, pagetable ID 0 will also be the default
  pagetable for all processes.  If per-process pagetables are enabled,
  there will be an entry for each pagetable, named after the ID of the
  process that created it.

  - /sys/devices/platform/kgsl/pagetables/NN/entries
    The number of concurrent entries mapped in the GPU MMU.

  - /sys/devices/platform/kgsl/pagetables/NN/mapped
    The number of bytes currently mapped in the GPU MMU.

  - /sys/devices/platform/kgsl/pagetables/NN/va_range
    The virtual address size of the MMU pagetable (in bytes).

  - /sys/devices/platform/kgsl/pagetables/NN/max_mapped
    The maximum number of bytes concurrently mapped in the GPU MMU since
    the pagetable was created.

  - /sys/devices/platform/kgsl/pagetables/NN/max_entries
    The maximum number of entries concurrently mapped in the GPU MMU since
    the pagetable was created.

- /sys/devices/platform/kgsl/msm_kgsl/
  Each individual GPU device (2D or 3D) will have its own device node in
  this directory.  All platforms will have kgsl-3d0 (3D device), some
  devices may have 1 2D device (kgsl-2d0) and others might add a second 2D
  device (kgsl-2d1).

  - /sys/devices/platform/kgsl/msm_kgsl/kgsl-XXX/pwrnap
  Controls the system ability to nap (lightly sleep between frames).  1
  indicates napping is enabled, 0 indicates it is disabled.  Write a 1 or
  a 0 to the file to control napping.

  - /sys/devices/platform/kgsl/msm_kgsl/kgsl-XXX/gpuclk
  Shows the last active requested speed of the GPU clock in HZ, does not
  actually measure the current clock rate. Write a clock speed to the file
  corresponding to a supported platform power level to change to that power
  level. The bandwidth vote will also be adjusted.