drivers/gpu/drm/i915/intel_memory_region.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2019 Intel Corporation
   4  */
   5
   6 #include "intel_memory_region.h"
   7 #include "i915_drv.h"
   8 #include "i915_ttm_buddy_manager.h"
   9
  10 static const struct {
  11         u16 class;
  12         u16 instance;
  13 } intel_region_map[] = {
  14         [INTEL_REGION_SMEM] = {
  15                 .class = INTEL_MEMORY_SYSTEM,
  16                 .instance = 0,
  17         },
  18         [INTEL_REGION_LMEM] = {
  19                 .class = INTEL_MEMORY_LOCAL,
  20                 .instance = 0,
  21         },
  22         [INTEL_REGION_STOLEN_SMEM] = {
  23                 .class = INTEL_MEMORY_STOLEN_SYSTEM,
  24                 .instance = 0,
  25         },
  26         [INTEL_REGION_STOLEN_LMEM] = {
  27                 .class = INTEL_MEMORY_STOLEN_LOCAL,
  28                 .instance = 0,
  29         },
  30 };
  31
  32 struct intel_memory_region *
  33 intel_memory_region_lookup(struct drm_i915_private *i915,
  34                            u16 class, u16 instance)
  35 {
  36         struct intel_memory_region *mr;
  37         int id;
  38
  39         /* XXX: consider maybe converting to an rb tree at some point */
  40         for_each_memory_region(mr, i915, id) {
  41                 if (mr->type == class && mr->instance == instance)
  42                         return mr;
  43         }
  44
  45         return NULL;
  46 }
  47
  48 struct intel_memory_region *
  49 intel_memory_region_by_type(struct drm_i915_private *i915,
  50                             enum intel_memory_type mem_type)
  51 {
  52         struct intel_memory_region *mr;
  53         int id;
  54
  55         for_each_memory_region(mr, i915, id)
  56                 if (mr->type == mem_type)
  57                         return mr;
  58
  59         return NULL;
  60 }
  61
  62 /**
  63  * intel_memory_region_reserve - Reserve a memory range
  64  * @mem: The region for which we want to reserve a range.
  65  * @offset: Start of the range to reserve.
  66  * @size: The size of the range to reserve.
  67  *
  68  * Return: 0 on success, negative error code on failure.
  69  */
  70 int intel_memory_region_reserve(struct intel_memory_region *mem,
  71                                 resource_size_t offset,
  72                                 resource_size_t size)
  73 {
  74         struct ttm_resource_manager *man = mem->region_private;
  75
  76         GEM_BUG_ON(mem->is_range_manager);
  77
  78         return i915_ttm_buddy_man_reserve(man, offset, size);
  79 }
  80
  81 struct intel_memory_region *
  82 intel_memory_region_create(struct drm_i915_private *i915,
  83                            resource_size_t start,
  84                            resource_size_t size,
  85                            resource_size_t min_page_size,
  86                            resource_size_t io_start,
  87                            u16 type,
  88                            u16 instance,
  89                            const struct intel_memory_region_ops *ops)
  90 {
  91         struct intel_memory_region *mem;
  92         int err;
  93
  94         mem = kzalloc(sizeof(*mem), GFP_KERNEL);
  95         if (!mem)
  96                 return ERR_PTR(-ENOMEM);
  97
  98         mem->i915 = i915;
  99         mem->region = (struct resource)DEFINE_RES_MEM(start, size);
 100         mem->io_start = io_start;
 101         mem->min_page_size = min_page_size;
 102         mem->ops = ops;
 103         mem->total = size;
 104         mem->avail = mem->total;
 105         mem->type = type;
 106         mem->instance = instance;
 107
 108         mutex_init(&mem->objects.lock);
 109         INIT_LIST_HEAD(&mem->objects.list);
 110
 111         if (ops->init) {
 112                 err = ops->init(mem);
 113                 if (err)
 114                         goto err_free;
 115         }
 116
 117         kref_init(&mem->kref);
 118         return mem;
 119
 120 err_free:
 121         kfree(mem);
 122         return ERR_PTR(err);
 123 }
 124
 125 void intel_memory_region_set_name(struct intel_memory_region *mem,
 126                                   const char *fmt, ...)
 127 {
 128         va_list ap;
 129
 130         va_start(ap, fmt);
 131         vsnprintf(mem->name, sizeof(mem->name), fmt, ap);
 132         va_end(ap);
 133 }
 134
 135 static void __intel_memory_region_destroy(struct kref *kref)
 136 {
 137         struct intel_memory_region *mem =
 138                 container_of(kref, typeof(*mem), kref);
 139
 140         if (mem->ops->release)
 141                 mem->ops->release(mem);
 142
 143         mutex_destroy(&mem->objects.lock);
 144         kfree(mem);
 145 }
 146
 147 struct intel_memory_region *
 148 intel_memory_region_get(struct intel_memory_region *mem)
 149 {
 150         kref_get(&mem->kref);
 151         return mem;
 152 }
 153
 154 void intel_memory_region_put(struct intel_memory_region *mem)
 155 {
 156         kref_put(&mem->kref, __intel_memory_region_destroy);
 157 }
 158
 159 /* Global memory region registration -- only slight layer inversions! */
 160
 161 int intel_memory_regions_hw_probe(struct drm_i915_private *i915)
 162 {
 163         int err, i;
 164
 165         for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
 166                 struct intel_memory_region *mem = ERR_PTR(-ENODEV);
 167                 u16 type, instance;
 168
 169                 if (!HAS_REGION(i915, BIT(i)))
 170                         continue;
 171
 172                 type = intel_region_map[i].class;
 173                 instance = intel_region_map[i].instance;
 174                 switch (type) {
 175                 case INTEL_MEMORY_SYSTEM:
 176                         if (IS_DGFX(i915))
 177                                 mem = i915_gem_ttm_system_setup(i915, type,
 178                                                                 instance);
 179                         else
 180                                 mem = i915_gem_shmem_setup(i915, type,
 181                                                            instance);
 182                         break;
 183                 case INTEL_MEMORY_STOLEN_LOCAL:
 184                         mem = i915_gem_stolen_lmem_setup(i915, type, instance);
 185                         if (!IS_ERR(mem))
 186                                 i915->mm.stolen_region = mem;
 187                         break;
 188                 case INTEL_MEMORY_STOLEN_SYSTEM:
 189                         mem = i915_gem_stolen_smem_setup(i915, type, instance);
 190                         if (!IS_ERR(mem))
 191                                 i915->mm.stolen_region = mem;
 192                         break;
 193                 default:
 194                         continue;
 195                 }
 196
 197                 if (IS_ERR(mem)) {
 198                         err = PTR_ERR(mem);
 199                         drm_err(&i915->drm,
 200                                 "Failed to setup region(%d) type=%d\n",
 201                                 err, type);
 202                         goto out_cleanup;
 203                 }
 204
 205                 mem->id = i;
 206                 i915->mm.regions[i] = mem;
 207         }
 208
 209         return 0;
 210
 211 out_cleanup:
 212         intel_memory_regions_driver_release(i915);
 213         return err;
 214 }
 215
 216 void intel_memory_regions_driver_release(struct drm_i915_private *i915)
 217 {
 218         int i;
 219
 220         for (i = 0; i < ARRAY_SIZE(i915->mm.regions); i++) {
 221                 struct intel_memory_region *region =
 222                         fetch_and_zero(&i915->mm.regions[i]);
 223
 224                 if (region)
 225                         intel_memory_region_put(region);
 226         }
 227 }
 228
 229 #if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 230 #include "selftests/intel_memory_region.c"
 231 #include "selftests/mock_region.c"
 232 #endif