drivers/gpu/drm/i915/display/intel_dsb_buffer.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright 2023, Intel Corporation.
   4  */
   5
   6 #include "gem/i915_gem_internal.h"
   7 #include "gem/i915_gem_lmem.h"
   8 #include "i915_drv.h"
   9 #include "i915_vma.h"
  10 #include "intel_display_types.h"
  11 #include "intel_dsb_buffer.h"
  12
  13 u32 intel_dsb_buffer_ggtt_offset(struct intel_dsb_buffer *dsb_buf)
  14 {
  15         return i915_ggtt_offset(dsb_buf->vma);
  16 }
  17
  18 void intel_dsb_buffer_write(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val)
  19 {
  20         dsb_buf->cmd_buf[idx] = val;
  21 }
  22
  23 u32 intel_dsb_buffer_read(struct intel_dsb_buffer *dsb_buf, u32 idx)
  24 {
  25         return dsb_buf->cmd_buf[idx];
  26 }
  27
  28 void intel_dsb_buffer_memset(struct intel_dsb_buffer *dsb_buf, u32 idx, u32 val, size_t size)
  29 {
  30         WARN_ON(idx > (dsb_buf->buf_size - size) / sizeof(*dsb_buf->cmd_buf));
  31
  32         memset(&dsb_buf->cmd_buf[idx], val, size);
  33 }
  34
  35 bool intel_dsb_buffer_create(struct intel_crtc *crtc, struct intel_dsb_buffer *dsb_buf, size_t size)
  36 {
  37         struct drm_i915_private *i915 = to_i915(crtc->base.dev);
  38         struct drm_i915_gem_object *obj;
  39         struct i915_vma *vma;
  40         u32 *buf;
  41
  42         if (HAS_LMEM(i915)) {
  43                 obj = i915_gem_object_create_lmem(i915, PAGE_ALIGN(size),
  44                                                   I915_BO_ALLOC_CONTIGUOUS);
  45                 if (IS_ERR(obj))
  46                         return false;
  47         } else {
  48                 obj = i915_gem_object_create_internal(i915, PAGE_ALIGN(size));
  49                 if (IS_ERR(obj))
  50                         return false;
  51
  52                 i915_gem_object_set_cache_coherency(obj, I915_CACHE_NONE);
  53         }
  54
  55         vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0);
  56         if (IS_ERR(vma)) {
  57                 i915_gem_object_put(obj);
  58                 return false;
  59         }
  60
  61         buf = i915_gem_object_pin_map_unlocked(vma->obj, I915_MAP_WC);
  62         if (IS_ERR(buf)) {
  63                 i915_vma_unpin_and_release(&vma, I915_VMA_RELEASE_MAP);
  64                 return false;
  65         }
  66
  67         dsb_buf->vma = vma;
  68         dsb_buf->cmd_buf = buf;
  69         dsb_buf->buf_size = size;
  70
  71         return true;
  72 }
  73
  74 void intel_dsb_buffer_cleanup(struct intel_dsb_buffer *dsb_buf)
  75 {
  76         i915_vma_unpin_and_release(&dsb_buf->vma, I915_VMA_RELEASE_MAP);
  77 }
  78
  79 void intel_dsb_buffer_flush_map(struct intel_dsb_buffer *dsb_buf)
  80 {
  81         i915_gem_object_flush_map(dsb_buf->vma->obj);
  82 }