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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) Fuzhou Rockchip Electronics Co.Ltd4 * Author:Mark Yao <mark.yao@rock-chips.com>5 */6 7#include <linux/dma-buf.h>8#include <linux/iommu.h>9#include <linux/vmalloc.h>10 11#include <drm/drm.h>12#include <drm/drm_fb_helper.h>13#include <drm/drm_gem.h>14#include <drm/drm_gem_dma_helper.h>15#include <drm/drm_prime.h>16#include <drm/drm_vma_manager.h>17 18#include "rockchip_drm_drv.h"19#include "rockchip_drm_gem.h"20 21static int rockchip_gem_iommu_map(struct rockchip_gem_object *rk_obj)22{23 struct drm_device *drm = rk_obj->base.dev;24 struct rockchip_drm_private *private = drm->dev_private;25 int prot = IOMMU_READ | IOMMU_WRITE;26 ssize_t ret;27 28 mutex_lock(&private->mm_lock);29 ret = drm_mm_insert_node_generic(&private->mm, &rk_obj->mm,30 rk_obj->base.size, PAGE_SIZE,31 0, 0);32 mutex_unlock(&private->mm_lock);33 34 if (ret < 0) {35 DRM_ERROR("out of I/O virtual memory: %zd\n", ret);36 return ret;37 }38 39 rk_obj->dma_addr = rk_obj->mm.start;40 41 ret = iommu_map_sgtable(private->domain, rk_obj->dma_addr, rk_obj->sgt,42 prot);43 if (ret < (ssize_t)rk_obj->base.size) {44 DRM_ERROR("failed to map buffer: size=%zd request_size=%zd\n",45 ret, rk_obj->base.size);46 ret = -ENOMEM;47 goto err_remove_node;48 }49 50 rk_obj->size = ret;51 52 return 0;53 54err_remove_node:55 mutex_lock(&private->mm_lock);56 drm_mm_remove_node(&rk_obj->mm);57 mutex_unlock(&private->mm_lock);58 59 return ret;60}61 62static int rockchip_gem_iommu_unmap(struct rockchip_gem_object *rk_obj)63{64 struct drm_device *drm = rk_obj->base.dev;65 struct rockchip_drm_private *private = drm->dev_private;66 67 iommu_unmap(private->domain, rk_obj->dma_addr, rk_obj->size);68 69 mutex_lock(&private->mm_lock);70 71 drm_mm_remove_node(&rk_obj->mm);72 73 mutex_unlock(&private->mm_lock);74 75 return 0;76}77 78static int rockchip_gem_get_pages(struct rockchip_gem_object *rk_obj)79{80 struct drm_device *drm = rk_obj->base.dev;81 int ret, i;82 struct scatterlist *s;83 84 rk_obj->pages = drm_gem_get_pages(&rk_obj->base);85 if (IS_ERR(rk_obj->pages))86 return PTR_ERR(rk_obj->pages);87 88 rk_obj->num_pages = rk_obj->base.size >> PAGE_SHIFT;89 90 rk_obj->sgt = drm_prime_pages_to_sg(rk_obj->base.dev,91 rk_obj->pages, rk_obj->num_pages);92 if (IS_ERR(rk_obj->sgt)) {93 ret = PTR_ERR(rk_obj->sgt);94 goto err_put_pages;95 }96 97 /*98 * Fake up the SG table so that dma_sync_sg_for_device() can be used99 * to flush the pages associated with it.100 *101 * TODO: Replace this by drm_clflush_sg() once it can be implemented102 * without relying on symbols that are not exported.103 */104 for_each_sgtable_sg(rk_obj->sgt, s, i)105 sg_dma_address(s) = sg_phys(s);106 107 dma_sync_sgtable_for_device(drm->dev, rk_obj->sgt, DMA_TO_DEVICE);108 109 return 0;110 111err_put_pages:112 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, false, false);113 return ret;114}115 116static void rockchip_gem_put_pages(struct rockchip_gem_object *rk_obj)117{118 sg_free_table(rk_obj->sgt);119 kfree(rk_obj->sgt);120 drm_gem_put_pages(&rk_obj->base, rk_obj->pages, true, true);121}122 123static int rockchip_gem_alloc_iommu(struct rockchip_gem_object *rk_obj,124 bool alloc_kmap)125{126 int ret;127 128 ret = rockchip_gem_get_pages(rk_obj);129 if (ret < 0)130 return ret;131 132 ret = rockchip_gem_iommu_map(rk_obj);133 if (ret < 0)134 goto err_free;135 136 if (alloc_kmap) {137 rk_obj->kvaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,138 pgprot_writecombine(PAGE_KERNEL));139 if (!rk_obj->kvaddr) {140 DRM_ERROR("failed to vmap() buffer\n");141 ret = -ENOMEM;142 goto err_unmap;143 }144 }145 146 return 0;147 148err_unmap:149 rockchip_gem_iommu_unmap(rk_obj);150err_free:151 rockchip_gem_put_pages(rk_obj);152 153 return ret;154}155 156static int rockchip_gem_alloc_dma(struct rockchip_gem_object *rk_obj,157 bool alloc_kmap)158{159 struct drm_gem_object *obj = &rk_obj->base;160 struct drm_device *drm = obj->dev;161 162 rk_obj->dma_attrs = DMA_ATTR_WRITE_COMBINE;163 164 if (!alloc_kmap)165 rk_obj->dma_attrs |= DMA_ATTR_NO_KERNEL_MAPPING;166 167 rk_obj->kvaddr = dma_alloc_attrs(drm->dev, obj->size,168 &rk_obj->dma_addr, GFP_KERNEL,169 rk_obj->dma_attrs);170 if (!rk_obj->kvaddr) {171 DRM_ERROR("failed to allocate %zu byte dma buffer", obj->size);172 return -ENOMEM;173 }174 175 return 0;176}177 178static int rockchip_gem_alloc_buf(struct rockchip_gem_object *rk_obj,179 bool alloc_kmap)180{181 struct drm_gem_object *obj = &rk_obj->base;182 struct drm_device *drm = obj->dev;183 struct rockchip_drm_private *private = drm->dev_private;184 185 if (private->domain)186 return rockchip_gem_alloc_iommu(rk_obj, alloc_kmap);187 else188 return rockchip_gem_alloc_dma(rk_obj, alloc_kmap);189}190 191static void rockchip_gem_free_iommu(struct rockchip_gem_object *rk_obj)192{193 vunmap(rk_obj->kvaddr);194 rockchip_gem_iommu_unmap(rk_obj);195 rockchip_gem_put_pages(rk_obj);196}197 198static void rockchip_gem_free_dma(struct rockchip_gem_object *rk_obj)199{200 struct drm_gem_object *obj = &rk_obj->base;201 struct drm_device *drm = obj->dev;202 203 dma_free_attrs(drm->dev, obj->size, rk_obj->kvaddr, rk_obj->dma_addr,204 rk_obj->dma_attrs);205}206 207static void rockchip_gem_free_buf(struct rockchip_gem_object *rk_obj)208{209 if (rk_obj->pages)210 rockchip_gem_free_iommu(rk_obj);211 else212 rockchip_gem_free_dma(rk_obj);213}214 215static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,216 struct vm_area_struct *vma)217{218 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);219 unsigned int count = obj->size >> PAGE_SHIFT;220 unsigned long user_count = vma_pages(vma);221 222 if (user_count == 0)223 return -ENXIO;224 225 return vm_map_pages(vma, rk_obj->pages, count);226}227 228static int rockchip_drm_gem_object_mmap_dma(struct drm_gem_object *obj,229 struct vm_area_struct *vma)230{231 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);232 struct drm_device *drm = obj->dev;233 234 return dma_mmap_attrs(drm->dev, vma, rk_obj->kvaddr, rk_obj->dma_addr,235 obj->size, rk_obj->dma_attrs);236}237 238static int rockchip_drm_gem_object_mmap(struct drm_gem_object *obj,239 struct vm_area_struct *vma)240{241 int ret;242 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);243 244 /*245 * Set vm_pgoff (used as a fake buffer offset by DRM) to 0 and map the246 * whole buffer from the start.247 */248 vma->vm_pgoff = 0;249 250 /*251 * We allocated a struct page table for rk_obj, so clear252 * VM_PFNMAP flag that was set by drm_gem_mmap_obj()/drm_gem_mmap().253 */254 vm_flags_mod(vma, VM_IO | VM_DONTEXPAND | VM_DONTDUMP, VM_PFNMAP);255 256 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));257 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);258 259 if (rk_obj->pages)260 ret = rockchip_drm_gem_object_mmap_iommu(obj, vma);261 else262 ret = rockchip_drm_gem_object_mmap_dma(obj, vma);263 264 return ret;265}266 267static void rockchip_gem_release_object(struct rockchip_gem_object *rk_obj)268{269 drm_gem_object_release(&rk_obj->base);270 kfree(rk_obj);271}272 273static const struct drm_gem_object_funcs rockchip_gem_object_funcs = {274 .free = rockchip_gem_free_object,275 .get_sg_table = rockchip_gem_prime_get_sg_table,276 .vmap = rockchip_gem_prime_vmap,277 .vunmap = rockchip_gem_prime_vunmap,278 .mmap = rockchip_drm_gem_object_mmap,279 .vm_ops = &drm_gem_dma_vm_ops,280};281 282static struct rockchip_gem_object *283 rockchip_gem_alloc_object(struct drm_device *drm, unsigned int size)284{285 struct rockchip_gem_object *rk_obj;286 struct drm_gem_object *obj;287 288 size = round_up(size, PAGE_SIZE);289 290 rk_obj = kzalloc(sizeof(*rk_obj), GFP_KERNEL);291 if (!rk_obj)292 return ERR_PTR(-ENOMEM);293 294 obj = &rk_obj->base;295 296 obj->funcs = &rockchip_gem_object_funcs;297 298 drm_gem_object_init(drm, obj, size);299 300 return rk_obj;301}302 303struct rockchip_gem_object *304rockchip_gem_create_object(struct drm_device *drm, unsigned int size,305 bool alloc_kmap)306{307 struct rockchip_gem_object *rk_obj;308 int ret;309 310 rk_obj = rockchip_gem_alloc_object(drm, size);311 if (IS_ERR(rk_obj))312 return rk_obj;313 314 ret = rockchip_gem_alloc_buf(rk_obj, alloc_kmap);315 if (ret)316 goto err_free_rk_obj;317 318 return rk_obj;319 320err_free_rk_obj:321 rockchip_gem_release_object(rk_obj);322 return ERR_PTR(ret);323}324 325/*326 * rockchip_gem_free_object - (struct drm_gem_object_funcs)->free327 * callback function328 */329void rockchip_gem_free_object(struct drm_gem_object *obj)330{331 struct drm_device *drm = obj->dev;332 struct rockchip_drm_private *private = drm->dev_private;333 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);334 335 if (obj->import_attach) {336 if (private->domain) {337 rockchip_gem_iommu_unmap(rk_obj);338 } else {339 dma_unmap_sgtable(drm->dev, rk_obj->sgt,340 DMA_BIDIRECTIONAL, 0);341 }342 drm_prime_gem_destroy(obj, rk_obj->sgt);343 } else {344 rockchip_gem_free_buf(rk_obj);345 }346 347 rockchip_gem_release_object(rk_obj);348}349 350/*351 * rockchip_gem_create_with_handle - allocate an object with the given352 * size and create a gem handle on it353 *354 * returns a struct rockchip_gem_object* on success or ERR_PTR values355 * on failure.356 */357static struct rockchip_gem_object *358rockchip_gem_create_with_handle(struct drm_file *file_priv,359 struct drm_device *drm, unsigned int size,360 unsigned int *handle)361{362 struct rockchip_gem_object *rk_obj;363 struct drm_gem_object *obj;364 bool is_framebuffer;365 int ret;366 367 is_framebuffer = drm->fb_helper && file_priv == drm->fb_helper->client.file;368 369 rk_obj = rockchip_gem_create_object(drm, size, is_framebuffer);370 if (IS_ERR(rk_obj))371 return ERR_CAST(rk_obj);372 373 obj = &rk_obj->base;374 375 /*376 * allocate a id of idr table where the obj is registered377 * and handle has the id what user can see.378 */379 ret = drm_gem_handle_create(file_priv, obj, handle);380 if (ret)381 goto err_handle_create;382 383 /* drop reference from allocate - handle holds it now. */384 drm_gem_object_put(obj);385 386 return rk_obj;387 388err_handle_create:389 rockchip_gem_free_object(obj);390 391 return ERR_PTR(ret);392}393 394/*395 * rockchip_gem_dumb_create - (struct drm_driver)->dumb_create callback396 * function397 *398 * This aligns the pitch and size arguments to the minimum required. wrap399 * this into your own function if you need bigger alignment.400 */401int rockchip_gem_dumb_create(struct drm_file *file_priv,402 struct drm_device *dev,403 struct drm_mode_create_dumb *args)404{405 struct rockchip_gem_object *rk_obj;406 int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);407 408 /*409 * align to 64 bytes since Mali requires it.410 */411 args->pitch = ALIGN(min_pitch, 64);412 args->size = args->pitch * args->height;413 414 rk_obj = rockchip_gem_create_with_handle(file_priv, dev, args->size,415 &args->handle);416 417 return PTR_ERR_OR_ZERO(rk_obj);418}419 420/*421 * Allocate a sg_table for this GEM object.422 * Note: Both the table's contents, and the sg_table itself must be freed by423 * the caller.424 * Returns a pointer to the newly allocated sg_table, or an ERR_PTR() error.425 */426struct sg_table *rockchip_gem_prime_get_sg_table(struct drm_gem_object *obj)427{428 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);429 struct drm_device *drm = obj->dev;430 struct sg_table *sgt;431 int ret;432 433 if (rk_obj->pages)434 return drm_prime_pages_to_sg(obj->dev, rk_obj->pages, rk_obj->num_pages);435 436 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);437 if (!sgt)438 return ERR_PTR(-ENOMEM);439 440 ret = dma_get_sgtable_attrs(drm->dev, sgt, rk_obj->kvaddr,441 rk_obj->dma_addr, obj->size,442 rk_obj->dma_attrs);443 if (ret) {444 DRM_ERROR("failed to allocate sgt, %d\n", ret);445 kfree(sgt);446 return ERR_PTR(ret);447 }448 449 return sgt;450}451 452static int453rockchip_gem_iommu_map_sg(struct drm_device *drm,454 struct dma_buf_attachment *attach,455 struct sg_table *sg,456 struct rockchip_gem_object *rk_obj)457{458 rk_obj->sgt = sg;459 return rockchip_gem_iommu_map(rk_obj);460}461 462static int463rockchip_gem_dma_map_sg(struct drm_device *drm,464 struct dma_buf_attachment *attach,465 struct sg_table *sg,466 struct rockchip_gem_object *rk_obj)467{468 int err = dma_map_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0);469 if (err)470 return err;471 472 if (drm_prime_get_contiguous_size(sg) < attach->dmabuf->size) {473 DRM_ERROR("failed to map sg_table to contiguous linear address.\n");474 dma_unmap_sgtable(drm->dev, sg, DMA_BIDIRECTIONAL, 0);475 return -EINVAL;476 }477 478 rk_obj->dma_addr = sg_dma_address(sg->sgl);479 rk_obj->sgt = sg;480 return 0;481}482 483struct drm_gem_object *484rockchip_gem_prime_import_sg_table(struct drm_device *drm,485 struct dma_buf_attachment *attach,486 struct sg_table *sg)487{488 struct rockchip_drm_private *private = drm->dev_private;489 struct rockchip_gem_object *rk_obj;490 int ret;491 492 rk_obj = rockchip_gem_alloc_object(drm, attach->dmabuf->size);493 if (IS_ERR(rk_obj))494 return ERR_CAST(rk_obj);495 496 if (private->domain)497 ret = rockchip_gem_iommu_map_sg(drm, attach, sg, rk_obj);498 else499 ret = rockchip_gem_dma_map_sg(drm, attach, sg, rk_obj);500 501 if (ret < 0) {502 DRM_ERROR("failed to import sg table: %d\n", ret);503 goto err_free_rk_obj;504 }505 506 return &rk_obj->base;507 508err_free_rk_obj:509 rockchip_gem_release_object(rk_obj);510 return ERR_PTR(ret);511}512 513int rockchip_gem_prime_vmap(struct drm_gem_object *obj, struct iosys_map *map)514{515 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);516 517 if (rk_obj->pages) {518 void *vaddr;519 520 if (rk_obj->kvaddr)521 vaddr = rk_obj->kvaddr;522 else523 vaddr = vmap(rk_obj->pages, rk_obj->num_pages, VM_MAP,524 pgprot_writecombine(PAGE_KERNEL));525 526 if (!vaddr)527 return -ENOMEM;528 iosys_map_set_vaddr(map, vaddr);529 return 0;530 }531 532 if (rk_obj->dma_attrs & DMA_ATTR_NO_KERNEL_MAPPING)533 return -ENOMEM;534 iosys_map_set_vaddr(map, rk_obj->kvaddr);535 536 return 0;537}538 539void rockchip_gem_prime_vunmap(struct drm_gem_object *obj,540 struct iosys_map *map)541{542 struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);543 544 if (rk_obj->pages) {545 if (map->vaddr != rk_obj->kvaddr)546 vunmap(map->vaddr);547 return;548 }549 550 /* Nothing to do if allocated by DMA mapping API. */551}552