LXR linux/drivers/gpu/drm/amd/amdgpu/amdgpu

   1/*
   2 * Copyright 2014 Advanced Micro Devices, Inc.
   3 * Copyright 2008 Red Hat Inc.
   4 * Copyright 2009 Jerome Glisse.
   5 *
   6 * Permission is hereby granted, free of charge, to any person obtaining a
   7 * copy of this software and associated documentation files (the "Software"),
   8 * to deal in the Software without restriction, including without limitation
   9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10 * and/or sell copies of the Software, and to permit persons to whom the
  11 * Software is furnished to do so, subject to the following conditions:
  12 *
  13 * The above copyright notice and this permission notice shall be included in
  14 * all copies or substantial portions of the Software.
  15 *
  16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22 * OTHER DEALINGS IN THE SOFTWARE.
  23 *
  24 */
  25#include <drm/drmP.h>
  26#include "amdgpu.h"
  27
  28/*
  29 * GPU scratch registers helpers function.
  30 */
  31/**
  32 * amdgpu_gfx_scratch_get - Allocate a scratch register
  33 *
  34 * @adev: amdgpu_device pointer
  35 * @reg: scratch register mmio offset
  36 *
  37 * Allocate a CP scratch register for use by the driver (all asics).
  38 * Returns 0 on success or -EINVAL on failure.
  39 */
  40int amdgpu_gfx_scratch_get(struct amdgpu_device *adev, uint32_t *reg)
  41{
  42        int i;
  43
  44        for (i = 0; i < adev->gfx.scratch.num_reg; i++) {
  45                if (adev->gfx.scratch.free[i]) {
  46                        adev->gfx.scratch.free[i] = false;
  47                        *reg = adev->gfx.scratch.reg[i];
  48                        return 0;
  49                }
  50        }
  51        return -EINVAL;
  52}
  53
  54/**
  55 * amdgpu_gfx_scratch_free - Free a scratch register
  56 *
  57 * @adev: amdgpu_device pointer
  58 * @reg: scratch register mmio offset
  59 *
  60 * Free a CP scratch register allocated for use by the driver (all asics)
  61 */
  62void amdgpu_gfx_scratch_free(struct amdgpu_device *adev, uint32_t reg)
  63{
  64        int i;
  65
  66        for (i = 0; i < adev->gfx.scratch.num_reg; i++) {
  67                if (adev->gfx.scratch.reg[i] == reg) {
  68                        adev->gfx.scratch.free[i] = true;
  69                        return;
  70                }
  71        }
  72}
  73