1 // SPDX-License-Identifier: GPL-2.0+ 2 /* Copyright (C) 2015-2018 Broadcom */ 3 4 /** 5 * DOC: V3D GEM BO management support 6 * 7 * Compared to VC4 (V3D 2.x), V3D 3.3 introduces an MMU between the 8 * GPU and the bus, allowing us to use shmem objects for our storage 9 * instead of CMA. 10 * 11 * Physically contiguous objects may still be imported to V3D, but the 12 * driver doesn't allocate physically contiguous objects on its own. 13 * Display engines requiring physically contiguous allocations should 14 * look into Mesa's "renderonly" support (as used by the Mesa pl111 15 * driver) for an example of how to integrate with V3D. 16 */ 17 18 #include <linux/dma-buf.h> 19 #include <linux/pfn_t.h> 20 #include <linux/vmalloc.h> 21 22 #include "v3d_drv.h" 23 #include "uapi/drm/v3d_drm.h" 24 25 static enum drm_gem_object_status v3d_gem_status(struct drm_gem_object *obj) 26 { 27 struct v3d_bo *bo = to_v3d_bo(obj); 28 enum drm_gem_object_status res = 0; 29 30 if (bo->base.pages) 31 res |= DRM_GEM_OBJECT_RESIDENT; 32 33 return res; 34 } 35 36 /* Called DRM core on the last userspace/kernel unreference of the 37 * BO. 38 */ 39 void v3d_free_object(struct drm_gem_object *obj) 40 { 41 struct v3d_dev *v3d = to_v3d_dev(obj->dev); 42 struct v3d_bo *bo = to_v3d_bo(obj); 43 44 if (bo->vaddr) 45 v3d_put_bo_vaddr(bo); 46 47 v3d_mmu_remove_ptes(bo); 48 49 mutex_lock(&v3d->bo_lock); 50 v3d->bo_stats.num_allocated--; 51 v3d->bo_stats.pages_allocated -= obj->size >> V3D_MMU_PAGE_SHIFT; 52 mutex_unlock(&v3d->bo_lock); 53 54 spin_lock(&v3d->mm_lock); 55 drm_mm_remove_node(&bo->node); 56 spin_unlock(&v3d->mm_lock); 57 58 /* GPU execution may have dirtied any pages in the BO. */ 59 bo->base.pages_mark_dirty_on_put = true; 60 61 drm_gem_shmem_free(&bo->base); 62 } 63 64 static const struct drm_gem_object_funcs v3d_gem_funcs = { 65 .free = v3d_free_object, 66 .print_info = drm_gem_shmem_object_print_info, 67 .pin = drm_gem_shmem_object_pin, 68 .unpin = drm_gem_shmem_object_unpin, 69 .get_sg_table = drm_gem_shmem_object_get_sg_table, 70 .vmap = drm_gem_shmem_object_vmap, 71 .vunmap = drm_gem_shmem_object_vunmap, 72 .mmap = drm_gem_shmem_object_mmap, 73 .status = v3d_gem_status, 74 .vm_ops = &drm_gem_shmem_vm_ops, 75 }; 76 77 /* gem_create_object function for allocating a BO struct and doing 78 * early setup. 79 */ 80 struct drm_gem_object *v3d_create_object(struct drm_device *dev, size_t size) 81 { 82 struct v3d_bo *bo; 83 struct drm_gem_object *obj; 84 85 if (size == 0) 86 return ERR_PTR(-EINVAL); 87 88 bo = kzalloc(sizeof(*bo), GFP_KERNEL); 89 if (!bo) 90 return ERR_PTR(-ENOMEM); 91 obj = &bo->base.base; 92 93 obj->funcs = &v3d_gem_funcs; 94 bo->base.map_wc = true; 95 INIT_LIST_HEAD(&bo->unref_head); 96 97 return &bo->base.base; 98 } 99 100 static int 101 v3d_bo_create_finish(struct drm_gem_object *obj) 102 { 103 struct v3d_dev *v3d = to_v3d_dev(obj->dev); 104 struct v3d_bo *bo = to_v3d_bo(obj); 105 struct sg_table *sgt; 106 u64 align; 107 int ret; 108 109 /* So far we pin the BO in the MMU for its lifetime, so use 110 * shmem's helper for getting a lifetime sgt. 111 */ 112 sgt = drm_gem_shmem_get_pages_sgt(&bo->base); 113 if (IS_ERR(sgt)) 114 return PTR_ERR(sgt); 115 116 if (!v3d->gemfs) 117 align = SZ_4K; 118 else if (obj->size >= SZ_1M) 119 align = SZ_1M; 120 else if (obj->size >= SZ_64K) 121 align = SZ_64K; 122 else 123 align = SZ_4K; 124 125 spin_lock(&v3d->mm_lock); 126 /* Allocate the object's space in the GPU's page tables. 127 * Inserting PTEs will happen later, but the offset is for the 128 * lifetime of the BO. 129 */ 130 ret = drm_mm_insert_node_generic(&v3d->mm, &bo->node, 131 obj->size >> V3D_MMU_PAGE_SHIFT, 132 align >> V3D_MMU_PAGE_SHIFT, 0, 0); 133 spin_unlock(&v3d->mm_lock); 134 if (ret) 135 return ret; 136 137 /* Track stats for /debug/dri/n/bo_stats. */ 138 mutex_lock(&v3d->bo_lock); 139 v3d->bo_stats.num_allocated++; 140 v3d->bo_stats.pages_allocated += obj->size >> V3D_MMU_PAGE_SHIFT; 141 mutex_unlock(&v3d->bo_lock); 142 143 v3d_mmu_insert_ptes(bo); 144 145 return 0; 146 } 147 148 struct v3d_bo *v3d_bo_create(struct drm_device *dev, struct drm_file *file_priv, 149 size_t unaligned_size) 150 { 151 struct drm_gem_shmem_object *shmem_obj; 152 struct v3d_dev *v3d = to_v3d_dev(dev); 153 struct v3d_bo *bo; 154 int ret; 155 156 shmem_obj = drm_gem_shmem_create_with_mnt(dev, unaligned_size, 157 v3d->gemfs); 158 if (IS_ERR(shmem_obj)) 159 return ERR_CAST(shmem_obj); 160 bo = to_v3d_bo(&shmem_obj->base); 161 bo->vaddr = NULL; 162 163 ret = v3d_bo_create_finish(&shmem_obj->base); 164 if (ret) 165 goto free_obj; 166 167 return bo; 168 169 free_obj: 170 drm_gem_shmem_free(shmem_obj); 171 return ERR_PTR(ret); 172 } 173 174 struct drm_gem_object * 175 v3d_prime_import_sg_table(struct drm_device *dev, 176 struct dma_buf_attachment *attach, 177 struct sg_table *sgt) 178 { 179 struct drm_gem_object *obj; 180 int ret; 181 182 obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt); 183 if (IS_ERR(obj)) 184 return obj; 185 186 ret = v3d_bo_create_finish(obj); 187 if (ret) { 188 drm_gem_shmem_free(&to_v3d_bo(obj)->base); 189 return ERR_PTR(ret); 190 } 191 192 return obj; 193 } 194 195 void v3d_get_bo_vaddr(struct v3d_bo *bo) 196 { 197 struct drm_gem_shmem_object *obj = &bo->base; 198 199 bo->vaddr = vmap(obj->pages, obj->base.size >> PAGE_SHIFT, VM_MAP, 200 pgprot_writecombine(PAGE_KERNEL)); 201 } 202 203 void v3d_put_bo_vaddr(struct v3d_bo *bo) 204 { 205 vunmap(bo->vaddr); 206 bo->vaddr = NULL; 207 } 208 209 int v3d_create_bo_ioctl(struct drm_device *dev, void *data, 210 struct drm_file *file_priv) 211 { 212 struct drm_v3d_create_bo *args = data; 213 struct v3d_bo *bo = NULL; 214 int ret; 215 216 if (args->flags != 0) { 217 DRM_INFO("unknown create_bo flags: %d\n", args->flags); 218 return -EINVAL; 219 } 220 221 bo = v3d_bo_create(dev, file_priv, PAGE_ALIGN(args->size)); 222 if (IS_ERR(bo)) 223 return PTR_ERR(bo); 224 225 args->offset = bo->node.start << V3D_MMU_PAGE_SHIFT; 226 227 ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle); 228 drm_gem_object_put(&bo->base.base); 229 230 return ret; 231 } 232 233 int v3d_mmap_bo_ioctl(struct drm_device *dev, void *data, 234 struct drm_file *file_priv) 235 { 236 struct drm_v3d_mmap_bo *args = data; 237 struct drm_gem_object *gem_obj; 238 239 if (args->flags != 0) { 240 DRM_INFO("unknown mmap_bo flags: %d\n", args->flags); 241 return -EINVAL; 242 } 243 244 gem_obj = drm_gem_object_lookup(file_priv, args->handle); 245 if (!gem_obj) { 246 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle); 247 return -ENOENT; 248 } 249 250 args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node); 251 drm_gem_object_put(gem_obj); 252 253 return 0; 254 } 255 256 int v3d_get_bo_offset_ioctl(struct drm_device *dev, void *data, 257 struct drm_file *file_priv) 258 { 259 struct drm_v3d_get_bo_offset *args = data; 260 struct drm_gem_object *gem_obj; 261 struct v3d_bo *bo; 262 263 gem_obj = drm_gem_object_lookup(file_priv, args->handle); 264 if (!gem_obj) { 265 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle); 266 return -ENOENT; 267 } 268 bo = to_v3d_bo(gem_obj); 269 270 args->offset = bo->node.start << V3D_MMU_PAGE_SHIFT; 271 272 drm_gem_object_put(gem_obj); 273 return 0; 274 } 275 276 int 277 v3d_wait_bo_ioctl(struct drm_device *dev, void *data, 278 struct drm_file *file_priv) 279 { 280 int ret; 281 struct drm_v3d_wait_bo *args = data; 282 ktime_t start = ktime_get(); 283 u64 delta_ns; 284 unsigned long timeout_jiffies = 285 nsecs_to_jiffies_timeout(args->timeout_ns); 286 287 if (args->pad != 0) 288 return -EINVAL; 289 290 ret = drm_gem_dma_resv_wait(file_priv, args->handle, 291 true, timeout_jiffies); 292 293 /* Decrement the user's timeout, in case we got interrupted 294 * such that the ioctl will be restarted. 295 */ 296 delta_ns = ktime_to_ns(ktime_sub(ktime_get(), start)); 297 if (delta_ns < args->timeout_ns) 298 args->timeout_ns -= delta_ns; 299 else 300 args->timeout_ns = 0; 301 302 /* Asked to wait beyond the jiffy/scheduler precision? */ 303 if (ret == -ETIME && args->timeout_ns) 304 ret = -EAGAIN; 305 306 return ret; 307 } 308