1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright 2019 Linaro, Ltd, Rob Herring <robh@kernel.org> */ 3 4 #include <linux/err.h> 5 #include <linux/slab.h> 6 #include <linux/dma-buf.h> 7 #include <linux/dma-mapping.h> 8 9 #include <drm/panfrost_drm.h> 10 #include "panfrost_device.h" 11 #include "panfrost_gem.h" 12 #include "panfrost_mmu.h" 13 14 /* Called DRM core on the last userspace/kernel unreference of the 15 * BO. 16 */ 17 static void panfrost_gem_free_object(struct drm_gem_object *obj) 18 { 19 struct panfrost_gem_object *bo = to_panfrost_bo(obj); 20 struct panfrost_device *pfdev = obj->dev->dev_private; 21 22 /* 23 * Make sure the BO is no longer inserted in the shrinker list before 24 * taking care of the destruction itself. If we don't do that we have a 25 * race condition between this function and what's done in 26 * panfrost_gem_shrinker_scan(). 27 */ 28 mutex_lock(&pfdev->shrinker_lock); 29 list_del_init(&bo->base.madv_list); 30 mutex_unlock(&pfdev->shrinker_lock); 31 32 /* 33 * If we still have mappings attached to the BO, there's a problem in 34 * our refcounting. 35 */ 36 WARN_ON_ONCE(!list_empty(&bo->mappings.list)); 37 38 if (bo->sgts) { 39 int i; 40 int n_sgt = bo->base.base.size / SZ_2M; 41 42 for (i = 0; i < n_sgt; i++) { 43 if (bo->sgts[i].sgl) { 44 dma_unmap_sgtable(pfdev->dev, &bo->sgts[i], 45 DMA_BIDIRECTIONAL, 0); 46 sg_free_table(&bo->sgts[i]); 47 } 48 } 49 kvfree(bo->sgts); 50 } 51 52 drm_gem_shmem_free_object(obj); 53 } 54 55 struct panfrost_gem_mapping * 56 panfrost_gem_mapping_get(struct panfrost_gem_object *bo, 57 struct panfrost_file_priv *priv) 58 { 59 struct panfrost_gem_mapping *iter, *mapping = NULL; 60 61 mutex_lock(&bo->mappings.lock); 62 list_for_each_entry(iter, &bo->mappings.list, node) { 63 if (iter->mmu == priv->mmu) { 64 kref_get(&iter->refcount); 65 mapping = iter; 66 break; 67 } 68 } 69 mutex_unlock(&bo->mappings.lock); 70 71 return mapping; 72 } 73 74 static void 75 panfrost_gem_teardown_mapping(struct panfrost_gem_mapping *mapping) 76 { 77 if (mapping->active) 78 panfrost_mmu_unmap(mapping); 79 80 spin_lock(&mapping->mmu->mm_lock); 81 if (drm_mm_node_allocated(&mapping->mmnode)) 82 drm_mm_remove_node(&mapping->mmnode); 83 spin_unlock(&mapping->mmu->mm_lock); 84 } 85 86 static void panfrost_gem_mapping_release(struct kref *kref) 87 { 88 struct panfrost_gem_mapping *mapping; 89 90 mapping = container_of(kref, struct panfrost_gem_mapping, refcount); 91 92 panfrost_gem_teardown_mapping(mapping); 93 drm_gem_object_put(&mapping->obj->base.base); 94 panfrost_mmu_ctx_put(mapping->mmu); 95 kfree(mapping); 96 } 97 98 void panfrost_gem_mapping_put(struct panfrost_gem_mapping *mapping) 99 { 100 if (!mapping) 101 return; 102 103 kref_put(&mapping->refcount, panfrost_gem_mapping_release); 104 } 105 106 void panfrost_gem_teardown_mappings_locked(struct panfrost_gem_object *bo) 107 { 108 struct panfrost_gem_mapping *mapping; 109 110 list_for_each_entry(mapping, &bo->mappings.list, node) 111 panfrost_gem_teardown_mapping(mapping); 112 } 113 114 int panfrost_gem_open(struct drm_gem_object *obj, struct drm_file *file_priv) 115 { 116 int ret; 117 size_t size = obj->size; 118 u64 align; 119 struct panfrost_gem_object *bo = to_panfrost_bo(obj); 120 unsigned long color = bo->noexec ? PANFROST_BO_NOEXEC : 0; 121 struct panfrost_file_priv *priv = file_priv->driver_priv; 122 struct panfrost_gem_mapping *mapping; 123 124 mapping = kzalloc(sizeof(*mapping), GFP_KERNEL); 125 if (!mapping) 126 return -ENOMEM; 127 128 INIT_LIST_HEAD(&mapping->node); 129 kref_init(&mapping->refcount); 130 drm_gem_object_get(obj); 131 mapping->obj = bo; 132 133 /* 134 * Executable buffers cannot cross a 16MB boundary as the program 135 * counter is 24-bits. We assume executable buffers will be less than 136 * 16MB and aligning executable buffers to their size will avoid 137 * crossing a 16MB boundary. 138 */ 139 if (!bo->noexec) 140 align = size >> PAGE_SHIFT; 141 else 142 align = size >= SZ_2M ? SZ_2M >> PAGE_SHIFT : 0; 143 144 mapping->mmu = panfrost_mmu_ctx_get(priv->mmu); 145 spin_lock(&mapping->mmu->mm_lock); 146 ret = drm_mm_insert_node_generic(&mapping->mmu->mm, &mapping->mmnode, 147 size >> PAGE_SHIFT, align, color, 0); 148 spin_unlock(&mapping->mmu->mm_lock); 149 if (ret) 150 goto err; 151 152 if (!bo->is_heap) { 153 ret = panfrost_mmu_map(mapping); 154 if (ret) 155 goto err; 156 } 157 158 mutex_lock(&bo->mappings.lock); 159 WARN_ON(bo->base.madv != PANFROST_MADV_WILLNEED); 160 list_add_tail(&mapping->node, &bo->mappings.list); 161 mutex_unlock(&bo->mappings.lock); 162 163 err: 164 if (ret) 165 panfrost_gem_mapping_put(mapping); 166 return ret; 167 } 168 169 void panfrost_gem_close(struct drm_gem_object *obj, struct drm_file *file_priv) 170 { 171 struct panfrost_file_priv *priv = file_priv->driver_priv; 172 struct panfrost_gem_object *bo = to_panfrost_bo(obj); 173 struct panfrost_gem_mapping *mapping = NULL, *iter; 174 175 mutex_lock(&bo->mappings.lock); 176 list_for_each_entry(iter, &bo->mappings.list, node) { 177 if (iter->mmu == priv->mmu) { 178 mapping = iter; 179 list_del(&iter->node); 180 break; 181 } 182 } 183 mutex_unlock(&bo->mappings.lock); 184 185 panfrost_gem_mapping_put(mapping); 186 } 187 188 static int panfrost_gem_pin(struct drm_gem_object *obj) 189 { 190 if (to_panfrost_bo(obj)->is_heap) 191 return -EINVAL; 192 193 return drm_gem_shmem_pin(obj); 194 } 195 196 static const struct drm_gem_object_funcs panfrost_gem_funcs = { 197 .free = panfrost_gem_free_object, 198 .open = panfrost_gem_open, 199 .close = panfrost_gem_close, 200 .print_info = drm_gem_shmem_print_info, 201 .pin = panfrost_gem_pin, 202 .unpin = drm_gem_shmem_unpin, 203 .get_sg_table = drm_gem_shmem_get_sg_table, 204 .vmap = drm_gem_shmem_vmap, 205 .vunmap = drm_gem_shmem_vunmap, 206 .mmap = drm_gem_shmem_mmap, 207 }; 208 209 /** 210 * panfrost_gem_create_object - Implementation of driver->gem_create_object. 211 * @dev: DRM device 212 * @size: Size in bytes of the memory the object will reference 213 * 214 * This lets the GEM helpers allocate object structs for us, and keep 215 * our BO stats correct. 216 */ 217 struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t size) 218 { 219 struct panfrost_device *pfdev = dev->dev_private; 220 struct panfrost_gem_object *obj; 221 222 obj = kzalloc(sizeof(*obj), GFP_KERNEL); 223 if (!obj) 224 return NULL; 225 226 INIT_LIST_HEAD(&obj->mappings.list); 227 mutex_init(&obj->mappings.lock); 228 obj->base.base.funcs = &panfrost_gem_funcs; 229 obj->base.map_wc = !pfdev->coherent; 230 231 return &obj->base.base; 232 } 233 234 struct panfrost_gem_object * 235 panfrost_gem_create_with_handle(struct drm_file *file_priv, 236 struct drm_device *dev, size_t size, 237 u32 flags, 238 uint32_t *handle) 239 { 240 int ret; 241 struct drm_gem_shmem_object *shmem; 242 struct panfrost_gem_object *bo; 243 244 /* Round up heap allocations to 2MB to keep fault handling simple */ 245 if (flags & PANFROST_BO_HEAP) 246 size = roundup(size, SZ_2M); 247 248 shmem = drm_gem_shmem_create(dev, size); 249 if (IS_ERR(shmem)) 250 return ERR_CAST(shmem); 251 252 bo = to_panfrost_bo(&shmem->base); 253 bo->noexec = !!(flags & PANFROST_BO_NOEXEC); 254 bo->is_heap = !!(flags & PANFROST_BO_HEAP); 255 256 /* 257 * Allocate an id of idr table where the obj is registered 258 * and handle has the id what user can see. 259 */ 260 ret = drm_gem_handle_create(file_priv, &shmem->base, handle); 261 /* drop reference from allocate - handle holds it now. */ 262 drm_gem_object_put(&shmem->base); 263 if (ret) 264 return ERR_PTR(ret); 265 266 return bo; 267 } 268 269 struct drm_gem_object * 270 panfrost_gem_prime_import_sg_table(struct drm_device *dev, 271 struct dma_buf_attachment *attach, 272 struct sg_table *sgt) 273 { 274 struct drm_gem_object *obj; 275 struct panfrost_gem_object *bo; 276 277 obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt); 278 if (IS_ERR(obj)) 279 return ERR_CAST(obj); 280 281 bo = to_panfrost_bo(obj); 282 bo->noexec = true; 283 284 return obj; 285 } 286