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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2015 MediaTek Inc.4 */5 6#include <linux/dma-buf.h>7#include <linux/vmalloc.h>8 9#include <drm/drm.h>10#include <drm/drm_device.h>11#include <drm/drm_gem.h>12#include <drm/drm_gem_dma_helper.h>13#include <drm/drm_prime.h>14 15#include "mtk_drm_drv.h"16#include "mtk_gem.h"17 18static int mtk_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);19 20static const struct vm_operations_struct vm_ops = {21 .open = drm_gem_vm_open,22 .close = drm_gem_vm_close,23};24 25static const struct drm_gem_object_funcs mtk_gem_object_funcs = {26 .free = mtk_gem_free_object,27 .get_sg_table = mtk_gem_prime_get_sg_table,28 .vmap = mtk_gem_prime_vmap,29 .vunmap = mtk_gem_prime_vunmap,30 .mmap = mtk_gem_object_mmap,31 .vm_ops = &vm_ops,32};33 34static struct mtk_gem_obj *mtk_gem_init(struct drm_device *dev,35 unsigned long size)36{37 struct mtk_gem_obj *mtk_gem_obj;38 int ret;39 40 size = round_up(size, PAGE_SIZE);41 42 if (size == 0)43 return ERR_PTR(-EINVAL);44 45 mtk_gem_obj = kzalloc(sizeof(*mtk_gem_obj), GFP_KERNEL);46 if (!mtk_gem_obj)47 return ERR_PTR(-ENOMEM);48 49 mtk_gem_obj->base.funcs = &mtk_gem_object_funcs;50 51 ret = drm_gem_object_init(dev, &mtk_gem_obj->base, size);52 if (ret < 0) {53 DRM_ERROR("failed to initialize gem object\n");54 kfree(mtk_gem_obj);55 return ERR_PTR(ret);56 }57 58 return mtk_gem_obj;59}60 61struct mtk_gem_obj *mtk_gem_create(struct drm_device *dev,62 size_t size, bool alloc_kmap)63{64 struct mtk_drm_private *priv = dev->dev_private;65 struct mtk_gem_obj *mtk_gem;66 struct drm_gem_object *obj;67 int ret;68 69 mtk_gem = mtk_gem_init(dev, size);70 if (IS_ERR(mtk_gem))71 return ERR_CAST(mtk_gem);72 73 obj = &mtk_gem->base;74 75 mtk_gem->dma_attrs = DMA_ATTR_WRITE_COMBINE;76 77 if (!alloc_kmap)78 mtk_gem->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;79 80 mtk_gem->cookie = dma_alloc_attrs(priv->dma_dev, obj->size,81 &mtk_gem->dma_addr, GFP_KERNEL,82 mtk_gem->dma_attrs);83 if (!mtk_gem->cookie) {84 DRM_ERROR("failed to allocate %zx byte dma buffer", obj->size);85 ret = -ENOMEM;86 goto err_gem_free;87 }88 89 if (alloc_kmap)90 mtk_gem->kvaddr = mtk_gem->cookie;91 92 DRM_DEBUG_DRIVER("cookie = %p dma_addr = %pad size = %zu\n",93 mtk_gem->cookie, &mtk_gem->dma_addr,94 size);95 96 return mtk_gem;97 98err_gem_free:99 drm_gem_object_release(obj);100 kfree(mtk_gem);101 return ERR_PTR(ret);102}103 104void mtk_gem_free_object(struct drm_gem_object *obj)105{106 struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);107 struct mtk_drm_private *priv = obj->dev->dev_private;108 109 if (mtk_gem->sg)110 drm_prime_gem_destroy(obj, mtk_gem->sg);111 else112 dma_free_attrs(priv->dma_dev, obj->size, mtk_gem->cookie,113 mtk_gem->dma_addr, mtk_gem->dma_attrs);114 115 /* release file pointer to gem object. */116 drm_gem_object_release(obj);117 118 kfree(mtk_gem);119}120 121int mtk_gem_dumb_create(struct drm_file *file_priv, struct drm_device *dev,122 struct drm_mode_create_dumb *args)123{124 struct mtk_gem_obj *mtk_gem;125 int ret;126 127 args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);128 129 /*130 * Multiply 2 variables of different types,131 * for example: args->size = args->spacing * args->height;132 * may cause coverity issue with unintentional overflow.133 */134 args->size = args->pitch;135 args->size *= args->height;136 137 mtk_gem = mtk_gem_create(dev, args->size, false);138 if (IS_ERR(mtk_gem))139 return PTR_ERR(mtk_gem);140 141 /*142 * allocate a id of idr table where the obj is registered143 * and handle has the id what user can see.144 */145 ret = drm_gem_handle_create(file_priv, &mtk_gem->base, &args->handle);146 if (ret)147 goto err_handle_create;148 149 /* drop reference from allocate - handle holds it now. */150 drm_gem_object_put(&mtk_gem->base);151 152 return 0;153 154err_handle_create:155 mtk_gem_free_object(&mtk_gem->base);156 return ret;157}158 159static int mtk_gem_object_mmap(struct drm_gem_object *obj,160 struct vm_area_struct *vma)161 162{163 int ret;164 struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);165 struct mtk_drm_private *priv = obj->dev->dev_private;166 167 /*168 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the169 * whole buffer from the start.170 */171 vma->vm_pgoff = 0;172 173 /*174 * dma_alloc_attrs() allocated a struct page table for mtk_gem, so clear175 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().176 */177 vm_flags_set(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP);178 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));179 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);180 181 ret = dma_mmap_attrs(priv->dma_dev, vma, mtk_gem->cookie,182 mtk_gem->dma_addr, obj->size, mtk_gem->dma_attrs);183 184 return ret;185}186 187/*188 * Allocate a sg_table for this GEM object.189 * Note: Both the table's contents, and the sg_table itself must be freed by190 * the caller.191 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.192 */193struct sg_table *mtk_gem_prime_get_sg_table(struct drm_gem_object *obj)194{195 struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);196 struct mtk_drm_private *priv = obj->dev->dev_private;197 struct sg_table *sgt;198 int ret;199 200 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);201 if (!sgt)202 return ERR_PTR(-ENOMEM);203 204 ret = dma_get_sgtable_attrs(priv->dma_dev, sgt, mtk_gem->cookie,205 mtk_gem->dma_addr, obj->size,206 mtk_gem->dma_attrs);207 if (ret) {208 DRM_ERROR("failed to allocate sgt, %d\n", ret);209 kfree(sgt);210 return ERR_PTR(ret);211 }212 213 return sgt;214}215 216struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,217 struct dma_buf_attachment *attach, struct sg_table *sg)218{219 struct mtk_gem_obj *mtk_gem;220 221 /* check if the entries in the sg_table are contiguous */222 if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {223 DRM_ERROR("sg_table is not contiguous");224 return ERR_PTR(-EINVAL);225 }226 227 mtk_gem = mtk_gem_init(dev, attach->dmabuf->size);228 if (IS_ERR(mtk_gem))229 return ERR_CAST(mtk_gem);230 231 mtk_gem->dma_addr = sg_dma_address(sg->sgl);232 mtk_gem->sg = sg;233 234 return &mtk_gem->base;235}236 237int mtk_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)238{239 struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);240 struct sg_table *sgt = NULL;241 unsigned int npages;242 243 if (mtk_gem->kvaddr)244 goto out;245 246 sgt = mtk_gem_prime_get_sg_table(obj);247 if (IS_ERR(sgt))248 return PTR_ERR(sgt);249 250 npages = obj->size >> PAGE_SHIFT;251 mtk_gem->pages = kcalloc(npages, sizeof(*mtk_gem->pages), GFP_KERNEL);252 if (!mtk_gem->pages) {253 sg_free_table(sgt);254 kfree(sgt);255 return -ENOMEM;256 }257 258 drm_prime_sg_to_page_array(sgt, mtk_gem->pages, npages);259 260 mtk_gem->kvaddr = vmap(mtk_gem->pages, npages, VM_MAP,261 pgprot_writecombine(PAGE_KERNEL));262 if (!mtk_gem->kvaddr) {263 sg_free_table(sgt);264 kfree(sgt);265 kfree(mtk_gem->pages);266 return -ENOMEM;267 }268 sg_free_table(sgt);269 kfree(sgt);270 271out:272 iosys_map_set_vaddr(map, mtk_gem->kvaddr);273 274 return 0;275}276 277void mtk_gem_prime_vunmap(struct drm_gem_object *obj, struct iosys_map *map)278{279 struct mtk_gem_obj *mtk_gem = to_mtk_gem_obj(obj);280 void *vaddr = map->vaddr;281 282 if (!mtk_gem->pages)283 return;284 285 vunmap(vaddr);286 mtk_gem->kvaddr = NULL;287 kfree(mtk_gem->pages);288}289