drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.c

   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  */
  40 int 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  */
  62 void 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 }