| 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 | * Long term, we should support evicting pages from the MMU when under |
| 18 | * memory pressure (thus the v3d_bo_get_pages() refcounting), but |
| 19 | * that's not a high priority since our systems tend to not have swap. |
| 20 | */ |
| 21 | |
| 22 | #include <linux/dma-buf.h> |
| 23 | #include <linux/pfn_t.h> |
| 24 | |
| 25 | #include "v3d_drv.h" |
| 26 | #include "uapi/drm/v3d_drm.h" |
| 27 | |
| 28 | /* Called DRM core on the last userspace/kernel unreference of the |
| 29 | * BO. |
| 30 | */ |
| 31 | void v3d_free_object(struct drm_gem_object *obj) |
| 32 | { |
| 33 | struct v3d_dev *v3d = to_v3d_dev(obj->dev); |
| 34 | struct v3d_bo *bo = to_v3d_bo(obj); |
| 35 | |
| 36 | v3d_mmu_remove_ptes(bo); |
| 37 | |
| 38 | mutex_lock(&v3d->bo_lock); |
| 39 | v3d->bo_stats.num_allocated--; |
| 40 | v3d->bo_stats.pages_allocated -= obj->size >> PAGE_SHIFT; |
| 41 | mutex_unlock(&v3d->bo_lock); |
| 42 | |
| 43 | spin_lock(&v3d->mm_lock); |
| 44 | drm_mm_remove_node(&bo->node); |
| 45 | spin_unlock(&v3d->mm_lock); |
| 46 | |
| 47 | /* GPU execution may have dirtied any pages in the BO. */ |
| 48 | bo->base.pages_mark_dirty_on_put = true; |
| 49 | |
| 50 | drm_gem_shmem_free_object(obj); |
| 51 | } |
| 52 | |
| 53 | static const struct drm_gem_object_funcs v3d_gem_funcs = { |
| 54 | .free = v3d_free_object, |
| 55 | .print_info = drm_gem_shmem_print_info, |
| 56 | .pin = drm_gem_shmem_pin, |
| 57 | .unpin = drm_gem_shmem_unpin, |
| 58 | .get_sg_table = drm_gem_shmem_get_sg_table, |
| 59 | .vmap = drm_gem_shmem_vmap, |
| 60 | .vunmap = drm_gem_shmem_vunmap, |
| 61 | .vm_ops = &drm_gem_shmem_vm_ops, |
| 62 | }; |
| 63 | |
| 64 | /* gem_create_object function for allocating a BO struct and doing |
| 65 | * early setup. |
| 66 | */ |
| 67 | struct drm_gem_object *v3d_create_object(struct drm_device *dev, size_t size) |
| 68 | { |
| 69 | struct v3d_bo *bo; |
| 70 | struct drm_gem_object *obj; |
| 71 | |
| 72 | if (size == 0) |
| 73 | return NULL; |
| 74 | |
| 75 | bo = kzalloc(sizeof(*bo), GFP_KERNEL); |
| 76 | if (!bo) |
| 77 | return NULL; |
| 78 | obj = &bo->base.base; |
| 79 | |
| 80 | obj->funcs = &v3d_gem_funcs; |
| 81 | |
| 82 | INIT_LIST_HEAD(&bo->unref_head); |
| 83 | |
| 84 | return &bo->base.base; |
| 85 | } |
| 86 | |
| 87 | static int |
| 88 | v3d_bo_create_finish(struct drm_gem_object *obj) |
| 89 | { |
| 90 | struct v3d_dev *v3d = to_v3d_dev(obj->dev); |
| 91 | struct v3d_bo *bo = to_v3d_bo(obj); |
| 92 | struct sg_table *sgt; |
| 93 | int ret; |
| 94 | |
| 95 | /* So far we pin the BO in the MMU for its lifetime, so use |
| 96 | * shmem's helper for getting a lifetime sgt. |
| 97 | */ |
| 98 | sgt = drm_gem_shmem_get_pages_sgt(&bo->base.base); |
| 99 | if (IS_ERR(sgt)) |
| 100 | return PTR_ERR(sgt); |
| 101 | |
| 102 | spin_lock(&v3d->mm_lock); |
| 103 | /* Allocate the object's space in the GPU's page tables. |
| 104 | * Inserting PTEs will happen later, but the offset is for the |
| 105 | * lifetime of the BO. |
| 106 | */ |
| 107 | ret = drm_mm_insert_node_generic(&v3d->mm, &bo->node, |
| 108 | obj->size >> PAGE_SHIFT, |
| 109 | GMP_GRANULARITY >> PAGE_SHIFT, 0, 0); |
| 110 | spin_unlock(&v3d->mm_lock); |
| 111 | if (ret) |
| 112 | return ret; |
| 113 | |
| 114 | /* Track stats for /debug/dri/n/bo_stats. */ |
| 115 | mutex_lock(&v3d->bo_lock); |
| 116 | v3d->bo_stats.num_allocated++; |
| 117 | v3d->bo_stats.pages_allocated += obj->size >> PAGE_SHIFT; |
| 118 | mutex_unlock(&v3d->bo_lock); |
| 119 | |
| 120 | v3d_mmu_insert_ptes(bo); |
| 121 | |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | struct v3d_bo *v3d_bo_create(struct drm_device *dev, struct drm_file *file_priv, |
| 126 | size_t unaligned_size) |
| 127 | { |
| 128 | struct drm_gem_shmem_object *shmem_obj; |
| 129 | struct v3d_bo *bo; |
| 130 | int ret; |
| 131 | |
| 132 | shmem_obj = drm_gem_shmem_create(dev, unaligned_size); |
| 133 | if (!shmem_obj) |
| 134 | return NULL; |
| 135 | bo = to_v3d_bo(&shmem_obj->base); |
| 136 | |
| 137 | ret = v3d_bo_create_finish(&shmem_obj->base); |
| 138 | if (ret) |
| 139 | goto free_obj; |
| 140 | |
| 141 | return bo; |
| 142 | |
| 143 | free_obj: |
| 144 | drm_gem_shmem_free_object(&shmem_obj->base); |
| 145 | return ERR_PTR(ret); |
| 146 | } |
| 147 | |
| 148 | struct drm_gem_object * |
| 149 | v3d_prime_import_sg_table(struct drm_device *dev, |
| 150 | struct dma_buf_attachment *attach, |
| 151 | struct sg_table *sgt) |
| 152 | { |
| 153 | struct drm_gem_object *obj; |
| 154 | int ret; |
| 155 | |
| 156 | obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt); |
| 157 | if (IS_ERR(obj)) |
| 158 | return obj; |
| 159 | |
| 160 | ret = v3d_bo_create_finish(obj); |
| 161 | if (ret) { |
| 162 | drm_gem_shmem_free_object(obj); |
| 163 | return ERR_PTR(ret); |
| 164 | } |
| 165 | |
| 166 | return obj; |
| 167 | } |
| 168 | |
| 169 | int v3d_create_bo_ioctl(struct drm_device *dev, void *data, |
| 170 | struct drm_file *file_priv) |
| 171 | { |
| 172 | struct drm_v3d_create_bo *args = data; |
| 173 | struct v3d_bo *bo = NULL; |
| 174 | int ret; |
| 175 | |
| 176 | if (args->flags != 0) { |
| 177 | DRM_INFO("unknown create_bo flags: %d\n", args->flags); |
| 178 | return -EINVAL; |
| 179 | } |
| 180 | |
| 181 | bo = v3d_bo_create(dev, file_priv, PAGE_ALIGN(args->size)); |
| 182 | if (IS_ERR(bo)) |
| 183 | return PTR_ERR(bo); |
| 184 | |
| 185 | args->offset = bo->node.start << PAGE_SHIFT; |
| 186 | |
| 187 | ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle); |
| 188 | drm_gem_object_put_unlocked(&bo->base.base); |
| 189 | |
| 190 | return ret; |
| 191 | } |
| 192 | |
| 193 | int v3d_mmap_bo_ioctl(struct drm_device *dev, void *data, |
| 194 | struct drm_file *file_priv) |
| 195 | { |
| 196 | struct drm_v3d_mmap_bo *args = data; |
| 197 | struct drm_gem_object *gem_obj; |
| 198 | |
| 199 | if (args->flags != 0) { |
| 200 | DRM_INFO("unknown mmap_bo flags: %d\n", args->flags); |
| 201 | return -EINVAL; |
| 202 | } |
| 203 | |
| 204 | gem_obj = drm_gem_object_lookup(file_priv, args->handle); |
| 205 | if (!gem_obj) { |
| 206 | DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle); |
| 207 | return -ENOENT; |
| 208 | } |
| 209 | |
| 210 | args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node); |
| 211 | drm_gem_object_put_unlocked(gem_obj); |
| 212 | |
| 213 | return 0; |
| 214 | } |
| 215 | |
| 216 | int v3d_get_bo_offset_ioctl(struct drm_device *dev, void *data, |
| 217 | struct drm_file *file_priv) |
| 218 | { |
| 219 | struct drm_v3d_get_bo_offset *args = data; |
| 220 | struct drm_gem_object *gem_obj; |
| 221 | struct v3d_bo *bo; |
| 222 | |
| 223 | gem_obj = drm_gem_object_lookup(file_priv, args->handle); |
| 224 | if (!gem_obj) { |
| 225 | DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle); |
| 226 | return -ENOENT; |
| 227 | } |
| 228 | bo = to_v3d_bo(gem_obj); |
| 229 | |
| 230 | args->offset = bo->node.start << PAGE_SHIFT; |
| 231 | |
| 232 | drm_gem_object_put_unlocked(gem_obj); |
| 233 | return 0; |
| 234 | } |