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1// SPDX-License-Identifier: GPL-2.0+2/* Copyright (C) 2015-2018 Broadcom */3 4/**5 * DOC: V3D GEM BO management support6 *7 * Compared to VC4 (V3D 2.x), V3D 3.3 introduces an MMU between the8 * GPU and the bus, allowing us to use shmem objects for our storage9 * instead of CMA.10 *11 * Physically contiguous objects may still be imported to V3D, but the12 * driver doesn't allocate physically contiguous objects on its own.13 * Display engines requiring physically contiguous allocations should14 * look into Mesa's "renderonly" support (as used by the Mesa pl11115 * driver) for an example of how to integrate with V3D.16 *17 * Long term, we should support evicting pages from the MMU when under18 * memory pressure (thus the v3d_bo_get_pages() refcounting), but19 * 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#include <linux/vmalloc.h>25 26#include "v3d_drv.h"27#include "uapi/drm/v3d_drm.h"28 29static enum drm_gem_object_status v3d_gem_status(struct drm_gem_object *obj)30{31 struct v3d_bo *bo = to_v3d_bo(obj);32 enum drm_gem_object_status res = 0;33 34 if (bo->base.pages)35 res |= DRM_GEM_OBJECT_RESIDENT;36 37 return res;38}39 40/* Called DRM core on the last userspace/kernel unreference of the41 * BO.42 */43void v3d_free_object(struct drm_gem_object *obj)44{45 struct v3d_dev *v3d = to_v3d_dev(obj->dev);46 struct v3d_bo *bo = to_v3d_bo(obj);47 48 if (bo->vaddr)49 v3d_put_bo_vaddr(bo);50 51 v3d_mmu_remove_ptes(bo);52 53 mutex_lock(&v3d->bo_lock);54 v3d->bo_stats.num_allocated--;55 v3d->bo_stats.pages_allocated -= obj->size >> V3D_MMU_PAGE_SHIFT;56 mutex_unlock(&v3d->bo_lock);57 58 spin_lock(&v3d->mm_lock);59 drm_mm_remove_node(&bo->node);60 spin_unlock(&v3d->mm_lock);61 62 /* GPU execution may have dirtied any pages in the BO. */63 bo->base.pages_mark_dirty_on_put = true;64 65 drm_gem_shmem_free(&bo->base);66}67 68static const struct drm_gem_object_funcs v3d_gem_funcs = {69 .free = v3d_free_object,70 .print_info = drm_gem_shmem_object_print_info,71 .pin = drm_gem_shmem_object_pin,72 .unpin = drm_gem_shmem_object_unpin,73 .get_sg_table = drm_gem_shmem_object_get_sg_table,74 .vmap = drm_gem_shmem_object_vmap,75 .vunmap = drm_gem_shmem_object_vunmap,76 .mmap = drm_gem_shmem_object_mmap,77 .status = v3d_gem_status,78 .vm_ops = &drm_gem_shmem_vm_ops,79};80 81/* gem_create_object function for allocating a BO struct and doing82 * early setup.83 */84struct drm_gem_object *v3d_create_object(struct drm_device *dev, size_t size)85{86 struct v3d_bo *bo;87 struct drm_gem_object *obj;88 89 if (size == 0)90 return ERR_PTR(-EINVAL);91 92 bo = kzalloc(sizeof(*bo), GFP_KERNEL);93 if (!bo)94 return ERR_PTR(-ENOMEM);95 obj = &bo->base.base;96 97 obj->funcs = &v3d_gem_funcs;98 bo->base.map_wc = true;99 INIT_LIST_HEAD(&bo->unref_head);100 101 return &bo->base.base;102}103 104static int105v3d_bo_create_finish(struct drm_gem_object *obj)106{107 struct v3d_dev *v3d = to_v3d_dev(obj->dev);108 struct v3d_bo *bo = to_v3d_bo(obj);109 struct sg_table *sgt;110 int ret;111 112 /* So far we pin the BO in the MMU for its lifetime, so use113 * shmem's helper for getting a lifetime sgt.114 */115 sgt = drm_gem_shmem_get_pages_sgt(&bo->base);116 if (IS_ERR(sgt))117 return PTR_ERR(sgt);118 119 spin_lock(&v3d->mm_lock);120 /* Allocate the object's space in the GPU's page tables.121 * Inserting PTEs will happen later, but the offset is for the122 * lifetime of the BO.123 */124 ret = drm_mm_insert_node_generic(&v3d->mm, &bo->node,125 obj->size >> V3D_MMU_PAGE_SHIFT,126 GMP_GRANULARITY >> V3D_MMU_PAGE_SHIFT, 0, 0);127 spin_unlock(&v3d->mm_lock);128 if (ret)129 return ret;130 131 /* Track stats for /debug/dri/n/bo_stats. */132 mutex_lock(&v3d->bo_lock);133 v3d->bo_stats.num_allocated++;134 v3d->bo_stats.pages_allocated += obj->size >> V3D_MMU_PAGE_SHIFT;135 mutex_unlock(&v3d->bo_lock);136 137 v3d_mmu_insert_ptes(bo);138 139 return 0;140}141 142struct v3d_bo *v3d_bo_create(struct drm_device *dev, struct drm_file *file_priv,143 size_t unaligned_size)144{145 struct drm_gem_shmem_object *shmem_obj;146 struct v3d_bo *bo;147 int ret;148 149 shmem_obj = drm_gem_shmem_create(dev, unaligned_size);150 if (IS_ERR(shmem_obj))151 return ERR_CAST(shmem_obj);152 bo = to_v3d_bo(&shmem_obj->base);153 bo->vaddr = NULL;154 155 ret = v3d_bo_create_finish(&shmem_obj->base);156 if (ret)157 goto free_obj;158 159 return bo;160 161free_obj:162 drm_gem_shmem_free(shmem_obj);163 return ERR_PTR(ret);164}165 166struct drm_gem_object *167v3d_prime_import_sg_table(struct drm_device *dev,168 struct dma_buf_attachment *attach,169 struct sg_table *sgt)170{171 struct drm_gem_object *obj;172 int ret;173 174 obj = drm_gem_shmem_prime_import_sg_table(dev, attach, sgt);175 if (IS_ERR(obj))176 return obj;177 178 ret = v3d_bo_create_finish(obj);179 if (ret) {180 drm_gem_shmem_free(&to_v3d_bo(obj)->base);181 return ERR_PTR(ret);182 }183 184 return obj;185}186 187void v3d_get_bo_vaddr(struct v3d_bo *bo)188{189 struct drm_gem_shmem_object *obj = &bo->base;190 191 bo->vaddr = vmap(obj->pages, obj->base.size >> PAGE_SHIFT, VM_MAP,192 pgprot_writecombine(PAGE_KERNEL));193}194 195void v3d_put_bo_vaddr(struct v3d_bo *bo)196{197 vunmap(bo->vaddr);198 bo->vaddr = NULL;199}200 201int v3d_create_bo_ioctl(struct drm_device *dev, void *data,202 struct drm_file *file_priv)203{204 struct drm_v3d_create_bo *args = data;205 struct v3d_bo *bo = NULL;206 int ret;207 208 if (args->flags != 0) {209 DRM_INFO("unknown create_bo flags: %d\n", args->flags);210 return -EINVAL;211 }212 213 bo = v3d_bo_create(dev, file_priv, PAGE_ALIGN(args->size));214 if (IS_ERR(bo))215 return PTR_ERR(bo);216 217 args->offset = bo->node.start << V3D_MMU_PAGE_SHIFT;218 219 ret = drm_gem_handle_create(file_priv, &bo->base.base, &args->handle);220 drm_gem_object_put(&bo->base.base);221 222 return ret;223}224 225int v3d_mmap_bo_ioctl(struct drm_device *dev, void *data,226 struct drm_file *file_priv)227{228 struct drm_v3d_mmap_bo *args = data;229 struct drm_gem_object *gem_obj;230 231 if (args->flags != 0) {232 DRM_INFO("unknown mmap_bo flags: %d\n", args->flags);233 return -EINVAL;234 }235 236 gem_obj = drm_gem_object_lookup(file_priv, args->handle);237 if (!gem_obj) {238 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);239 return -ENOENT;240 }241 242 args->offset = drm_vma_node_offset_addr(&gem_obj->vma_node);243 drm_gem_object_put(gem_obj);244 245 return 0;246}247 248int v3d_get_bo_offset_ioctl(struct drm_device *dev, void *data,249 struct drm_file *file_priv)250{251 struct drm_v3d_get_bo_offset *args = data;252 struct drm_gem_object *gem_obj;253 struct v3d_bo *bo;254 255 gem_obj = drm_gem_object_lookup(file_priv, args->handle);256 if (!gem_obj) {257 DRM_DEBUG("Failed to look up GEM BO %d\n", args->handle);258 return -ENOENT;259 }260 bo = to_v3d_bo(gem_obj);261 262 args->offset = bo->node.start << V3D_MMU_PAGE_SHIFT;263 264 drm_gem_object_put(gem_obj);265 return 0;266}267 268int269v3d_wait_bo_ioctl(struct drm_device *dev, void *data,270 struct drm_file *file_priv)271{272 int ret;273 struct drm_v3d_wait_bo *args = data;274 ktime_t start = ktime_get();275 u64 delta_ns;276 unsigned long timeout_jiffies =277 nsecs_to_jiffies_timeout(args->timeout_ns);278 279 if (args->pad != 0)280 return -EINVAL;281 282 ret = drm_gem_dma_resv_wait(file_priv, args->handle,283 true, timeout_jiffies);284 285 /* Decrement the user's timeout, in case we got interrupted286 * such that the ioctl will be restarted.287 */288 delta_ns = ktime_to_ns(ktime_sub(ktime_get(), start));289 if (delta_ns < args->timeout_ns)290 args->timeout_ns -= delta_ns;291 else292 args->timeout_ns = 0;293 294 /* Asked to wait beyond the jiffy/scheduler precision? */295 if (ret == -ETIME && args->timeout_ns)296 ret = -EAGAIN;297 298 return ret;299}300