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![Rob Clark](/assets/img/avatar_default.png)
Once we create the handle, the handle owns the reference. Currently
nothing was doing anything with the shmem ptr after the handle was
created, but let's change drm_gem_shmem_create_with_handle() to not
return the pointer, so-as to not encourage problematic use of this
function in the future. As a bonus, it makes the code a bit cleaner.
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230123154831.3191821-1-robdclark@gmail.com
(cherry picked from commit d023d6f741
)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
772 lines
20 KiB
C
772 lines
20 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2018 Noralf Trønnes
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*/
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#include <linux/dma-buf.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/shmem_fs.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/module.h>
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#ifdef CONFIG_X86
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#include <asm/set_memory.h>
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#endif
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#include <drm/drm.h>
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#include <drm/drm_device.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_gem_shmem_helper.h>
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#include <drm/drm_prime.h>
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#include <drm/drm_print.h>
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MODULE_IMPORT_NS(DMA_BUF);
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/**
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* DOC: overview
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*
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* This library provides helpers for GEM objects backed by shmem buffers
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* allocated using anonymous pageable memory.
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*
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* Functions that operate on the GEM object receive struct &drm_gem_shmem_object.
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* For GEM callback helpers in struct &drm_gem_object functions, see likewise
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* named functions with an _object_ infix (e.g., drm_gem_shmem_object_vmap() wraps
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* drm_gem_shmem_vmap()). These helpers perform the necessary type conversion.
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*/
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static const struct drm_gem_object_funcs drm_gem_shmem_funcs = {
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.free = drm_gem_shmem_object_free,
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.print_info = drm_gem_shmem_object_print_info,
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.pin = drm_gem_shmem_object_pin,
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.unpin = drm_gem_shmem_object_unpin,
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.get_sg_table = drm_gem_shmem_object_get_sg_table,
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.vmap = drm_gem_shmem_object_vmap,
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.vunmap = drm_gem_shmem_object_vunmap,
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.mmap = drm_gem_shmem_object_mmap,
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.vm_ops = &drm_gem_shmem_vm_ops,
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};
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static struct drm_gem_shmem_object *
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__drm_gem_shmem_create(struct drm_device *dev, size_t size, bool private)
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{
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struct drm_gem_shmem_object *shmem;
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struct drm_gem_object *obj;
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int ret = 0;
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size = PAGE_ALIGN(size);
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if (dev->driver->gem_create_object) {
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obj = dev->driver->gem_create_object(dev, size);
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if (IS_ERR(obj))
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return ERR_CAST(obj);
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shmem = to_drm_gem_shmem_obj(obj);
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} else {
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shmem = kzalloc(sizeof(*shmem), GFP_KERNEL);
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if (!shmem)
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return ERR_PTR(-ENOMEM);
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obj = &shmem->base;
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}
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if (!obj->funcs)
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obj->funcs = &drm_gem_shmem_funcs;
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if (private) {
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drm_gem_private_object_init(dev, obj, size);
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shmem->map_wc = false; /* dma-buf mappings use always writecombine */
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} else {
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ret = drm_gem_object_init(dev, obj, size);
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}
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if (ret) {
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drm_gem_private_object_fini(obj);
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goto err_free;
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}
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ret = drm_gem_create_mmap_offset(obj);
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if (ret)
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goto err_release;
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mutex_init(&shmem->pages_lock);
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mutex_init(&shmem->vmap_lock);
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INIT_LIST_HEAD(&shmem->madv_list);
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if (!private) {
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/*
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* Our buffers are kept pinned, so allocating them
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* from the MOVABLE zone is a really bad idea, and
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* conflicts with CMA. See comments above new_inode()
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* why this is required _and_ expected if you're
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* going to pin these pages.
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*/
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mapping_set_gfp_mask(obj->filp->f_mapping, GFP_HIGHUSER |
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__GFP_RETRY_MAYFAIL | __GFP_NOWARN);
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}
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return shmem;
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err_release:
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drm_gem_object_release(obj);
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err_free:
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kfree(obj);
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return ERR_PTR(ret);
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}
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/**
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* drm_gem_shmem_create - Allocate an object with the given size
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* @dev: DRM device
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* @size: Size of the object to allocate
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*
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* This function creates a shmem GEM object.
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*
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* Returns:
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* A struct drm_gem_shmem_object * on success or an ERR_PTR()-encoded negative
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* error code on failure.
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*/
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struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size)
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{
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return __drm_gem_shmem_create(dev, size, false);
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}
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EXPORT_SYMBOL_GPL(drm_gem_shmem_create);
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/**
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* drm_gem_shmem_free - Free resources associated with a shmem GEM object
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* @shmem: shmem GEM object to free
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*
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* This function cleans up the GEM object state and frees the memory used to
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* store the object itself.
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*/
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void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem)
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{
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struct drm_gem_object *obj = &shmem->base;
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WARN_ON(shmem->vmap_use_count);
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if (obj->import_attach) {
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drm_prime_gem_destroy(obj, shmem->sgt);
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} else {
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if (shmem->sgt) {
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dma_unmap_sgtable(obj->dev->dev, shmem->sgt,
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DMA_BIDIRECTIONAL, 0);
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sg_free_table(shmem->sgt);
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kfree(shmem->sgt);
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}
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if (shmem->pages)
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drm_gem_shmem_put_pages(shmem);
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}
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WARN_ON(shmem->pages_use_count);
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drm_gem_object_release(obj);
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mutex_destroy(&shmem->pages_lock);
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mutex_destroy(&shmem->vmap_lock);
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kfree(shmem);
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}
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EXPORT_SYMBOL_GPL(drm_gem_shmem_free);
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static int drm_gem_shmem_get_pages_locked(struct drm_gem_shmem_object *shmem)
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{
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struct drm_gem_object *obj = &shmem->base;
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struct page **pages;
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if (shmem->pages_use_count++ > 0)
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return 0;
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pages = drm_gem_get_pages(obj);
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if (IS_ERR(pages)) {
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DRM_DEBUG_KMS("Failed to get pages (%ld)\n", PTR_ERR(pages));
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shmem->pages_use_count = 0;
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return PTR_ERR(pages);
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}
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/*
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* TODO: Allocating WC pages which are correctly flushed is only
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* supported on x86. Ideal solution would be a GFP_WC flag, which also
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* ttm_pool.c could use.
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*/
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#ifdef CONFIG_X86
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if (shmem->map_wc)
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set_pages_array_wc(pages, obj->size >> PAGE_SHIFT);
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#endif
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shmem->pages = pages;
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return 0;
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}
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/*
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* drm_gem_shmem_get_pages - Allocate backing pages for a shmem GEM object
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* @shmem: shmem GEM object
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*
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* This function makes sure that backing pages exists for the shmem GEM object
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* and increases the use count.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem)
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{
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int ret;
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WARN_ON(shmem->base.import_attach);
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ret = mutex_lock_interruptible(&shmem->pages_lock);
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if (ret)
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return ret;
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ret = drm_gem_shmem_get_pages_locked(shmem);
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mutex_unlock(&shmem->pages_lock);
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_shmem_get_pages);
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static void drm_gem_shmem_put_pages_locked(struct drm_gem_shmem_object *shmem)
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{
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struct drm_gem_object *obj = &shmem->base;
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if (WARN_ON_ONCE(!shmem->pages_use_count))
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return;
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if (--shmem->pages_use_count > 0)
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return;
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#ifdef CONFIG_X86
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if (shmem->map_wc)
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set_pages_array_wb(shmem->pages, obj->size >> PAGE_SHIFT);
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#endif
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drm_gem_put_pages(obj, shmem->pages,
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shmem->pages_mark_dirty_on_put,
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shmem->pages_mark_accessed_on_put);
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shmem->pages = NULL;
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}
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/*
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* drm_gem_shmem_put_pages - Decrease use count on the backing pages for a shmem GEM object
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* @shmem: shmem GEM object
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*
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* This function decreases the use count and puts the backing pages when use drops to zero.
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*/
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void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem)
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{
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mutex_lock(&shmem->pages_lock);
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drm_gem_shmem_put_pages_locked(shmem);
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mutex_unlock(&shmem->pages_lock);
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}
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EXPORT_SYMBOL(drm_gem_shmem_put_pages);
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/**
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* drm_gem_shmem_pin - Pin backing pages for a shmem GEM object
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* @shmem: shmem GEM object
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*
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* This function makes sure the backing pages are pinned in memory while the
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* buffer is exported.
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem)
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{
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WARN_ON(shmem->base.import_attach);
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return drm_gem_shmem_get_pages(shmem);
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}
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EXPORT_SYMBOL(drm_gem_shmem_pin);
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/**
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* drm_gem_shmem_unpin - Unpin backing pages for a shmem GEM object
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* @shmem: shmem GEM object
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*
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* This function removes the requirement that the backing pages are pinned in
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* memory.
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*/
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void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem)
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{
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WARN_ON(shmem->base.import_attach);
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drm_gem_shmem_put_pages(shmem);
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}
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EXPORT_SYMBOL(drm_gem_shmem_unpin);
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static int drm_gem_shmem_vmap_locked(struct drm_gem_shmem_object *shmem,
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struct iosys_map *map)
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{
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struct drm_gem_object *obj = &shmem->base;
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int ret = 0;
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if (shmem->vmap_use_count++ > 0) {
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iosys_map_set_vaddr(map, shmem->vaddr);
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return 0;
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}
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if (obj->import_attach) {
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ret = dma_buf_vmap(obj->import_attach->dmabuf, map);
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if (!ret) {
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if (WARN_ON(map->is_iomem)) {
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dma_buf_vunmap(obj->import_attach->dmabuf, map);
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ret = -EIO;
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goto err_put_pages;
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}
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shmem->vaddr = map->vaddr;
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}
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} else {
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pgprot_t prot = PAGE_KERNEL;
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ret = drm_gem_shmem_get_pages(shmem);
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if (ret)
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goto err_zero_use;
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if (shmem->map_wc)
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prot = pgprot_writecombine(prot);
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shmem->vaddr = vmap(shmem->pages, obj->size >> PAGE_SHIFT,
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VM_MAP, prot);
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if (!shmem->vaddr)
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ret = -ENOMEM;
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else
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iosys_map_set_vaddr(map, shmem->vaddr);
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}
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if (ret) {
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DRM_DEBUG_KMS("Failed to vmap pages, error %d\n", ret);
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goto err_put_pages;
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}
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return 0;
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err_put_pages:
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if (!obj->import_attach)
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drm_gem_shmem_put_pages(shmem);
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err_zero_use:
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shmem->vmap_use_count = 0;
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return ret;
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}
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/*
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* drm_gem_shmem_vmap - Create a virtual mapping for a shmem GEM object
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* @shmem: shmem GEM object
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* @map: Returns the kernel virtual address of the SHMEM GEM object's backing
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* store.
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*
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* This function makes sure that a contiguous kernel virtual address mapping
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* exists for the buffer backing the shmem GEM object. It hides the differences
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* between dma-buf imported and natively allocated objects.
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*
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* Acquired mappings should be cleaned up by calling drm_gem_shmem_vunmap().
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*
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* Returns:
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* 0 on success or a negative error code on failure.
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*/
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int drm_gem_shmem_vmap(struct drm_gem_shmem_object *shmem,
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struct iosys_map *map)
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{
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int ret;
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ret = mutex_lock_interruptible(&shmem->vmap_lock);
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if (ret)
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return ret;
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ret = drm_gem_shmem_vmap_locked(shmem, map);
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mutex_unlock(&shmem->vmap_lock);
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return ret;
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}
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EXPORT_SYMBOL(drm_gem_shmem_vmap);
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static void drm_gem_shmem_vunmap_locked(struct drm_gem_shmem_object *shmem,
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struct iosys_map *map)
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{
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struct drm_gem_object *obj = &shmem->base;
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if (WARN_ON_ONCE(!shmem->vmap_use_count))
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return;
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if (--shmem->vmap_use_count > 0)
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return;
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if (obj->import_attach) {
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dma_buf_vunmap(obj->import_attach->dmabuf, map);
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} else {
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vunmap(shmem->vaddr);
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drm_gem_shmem_put_pages(shmem);
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}
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shmem->vaddr = NULL;
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}
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/*
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* drm_gem_shmem_vunmap - Unmap a virtual mapping for a shmem GEM object
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* @shmem: shmem GEM object
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* @map: Kernel virtual address where the SHMEM GEM object was mapped
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*
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* This function cleans up a kernel virtual address mapping acquired by
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* drm_gem_shmem_vmap(). The mapping is only removed when the use count drops to
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* zero.
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*
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* This function hides the differences between dma-buf imported and natively
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* allocated objects.
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*/
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void drm_gem_shmem_vunmap(struct drm_gem_shmem_object *shmem,
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struct iosys_map *map)
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{
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mutex_lock(&shmem->vmap_lock);
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drm_gem_shmem_vunmap_locked(shmem, map);
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mutex_unlock(&shmem->vmap_lock);
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}
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EXPORT_SYMBOL(drm_gem_shmem_vunmap);
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static int
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drm_gem_shmem_create_with_handle(struct drm_file *file_priv,
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struct drm_device *dev, size_t size,
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uint32_t *handle)
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{
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struct drm_gem_shmem_object *shmem;
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int ret;
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shmem = drm_gem_shmem_create(dev, size);
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if (IS_ERR(shmem))
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return PTR_ERR(shmem);
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/*
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* Allocate an id of idr table where the obj is registered
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* and handle has the id what user can see.
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*/
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ret = drm_gem_handle_create(file_priv, &shmem->base, handle);
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/* drop reference from allocate - handle holds it now. */
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drm_gem_object_put(&shmem->base);
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return ret;
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}
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/* Update madvise status, returns true if not purged, else
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* false or -errno.
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*/
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int drm_gem_shmem_madvise(struct drm_gem_shmem_object *shmem, int madv)
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{
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mutex_lock(&shmem->pages_lock);
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if (shmem->madv >= 0)
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shmem->madv = madv;
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madv = shmem->madv;
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mutex_unlock(&shmem->pages_lock);
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return (madv >= 0);
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}
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EXPORT_SYMBOL(drm_gem_shmem_madvise);
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void drm_gem_shmem_purge_locked(struct drm_gem_shmem_object *shmem)
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{
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struct drm_gem_object *obj = &shmem->base;
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struct drm_device *dev = obj->dev;
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WARN_ON(!drm_gem_shmem_is_purgeable(shmem));
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dma_unmap_sgtable(dev->dev, shmem->sgt, DMA_BIDIRECTIONAL, 0);
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sg_free_table(shmem->sgt);
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kfree(shmem->sgt);
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shmem->sgt = NULL;
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drm_gem_shmem_put_pages_locked(shmem);
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shmem->madv = -1;
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drm_vma_node_unmap(&obj->vma_node, dev->anon_inode->i_mapping);
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drm_gem_free_mmap_offset(obj);
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/* Our goal here is to return as much of the memory as
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* is possible back to the system as we are called from OOM.
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* To do this we must instruct the shmfs to drop all of its
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* backing pages, *now*.
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*/
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shmem_truncate_range(file_inode(obj->filp), 0, (loff_t)-1);
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invalidate_mapping_pages(file_inode(obj->filp)->i_mapping, 0, (loff_t)-1);
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}
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EXPORT_SYMBOL(drm_gem_shmem_purge_locked);
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bool drm_gem_shmem_purge(struct drm_gem_shmem_object *shmem)
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{
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if (!mutex_trylock(&shmem->pages_lock))
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return false;
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drm_gem_shmem_purge_locked(shmem);
|
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mutex_unlock(&shmem->pages_lock);
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_shmem_purge);
|
|
|
|
/**
|
|
* drm_gem_shmem_dumb_create - Create a dumb shmem buffer object
|
|
* @file: DRM file structure to create the dumb buffer for
|
|
* @dev: DRM device
|
|
* @args: IOCTL data
|
|
*
|
|
* This function computes the pitch of the dumb buffer and rounds it up to an
|
|
* integer number of bytes per pixel. Drivers for hardware that doesn't have
|
|
* any additional restrictions on the pitch can directly use this function as
|
|
* their &drm_driver.dumb_create callback.
|
|
*
|
|
* For hardware with additional restrictions, drivers can adjust the fields
|
|
* set up by userspace before calling into this function.
|
|
*
|
|
* Returns:
|
|
* 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
|
|
struct drm_mode_create_dumb *args)
|
|
{
|
|
u32 min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
|
|
|
|
if (!args->pitch || !args->size) {
|
|
args->pitch = min_pitch;
|
|
args->size = PAGE_ALIGN(args->pitch * args->height);
|
|
} else {
|
|
/* ensure sane minimum values */
|
|
if (args->pitch < min_pitch)
|
|
args->pitch = min_pitch;
|
|
if (args->size < args->pitch * args->height)
|
|
args->size = PAGE_ALIGN(args->pitch * args->height);
|
|
}
|
|
|
|
return drm_gem_shmem_create_with_handle(file, dev, args->size, &args->handle);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_shmem_dumb_create);
|
|
|
|
static vm_fault_t drm_gem_shmem_fault(struct vm_fault *vmf)
|
|
{
|
|
struct vm_area_struct *vma = vmf->vma;
|
|
struct drm_gem_object *obj = vma->vm_private_data;
|
|
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
|
loff_t num_pages = obj->size >> PAGE_SHIFT;
|
|
vm_fault_t ret;
|
|
struct page *page;
|
|
pgoff_t page_offset;
|
|
|
|
/* We don't use vmf->pgoff since that has the fake offset */
|
|
page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
|
|
|
|
mutex_lock(&shmem->pages_lock);
|
|
|
|
if (page_offset >= num_pages ||
|
|
WARN_ON_ONCE(!shmem->pages) ||
|
|
shmem->madv < 0) {
|
|
ret = VM_FAULT_SIGBUS;
|
|
} else {
|
|
page = shmem->pages[page_offset];
|
|
|
|
ret = vmf_insert_pfn(vma, vmf->address, page_to_pfn(page));
|
|
}
|
|
|
|
mutex_unlock(&shmem->pages_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void drm_gem_shmem_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_object *obj = vma->vm_private_data;
|
|
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
|
|
|
WARN_ON(shmem->base.import_attach);
|
|
|
|
mutex_lock(&shmem->pages_lock);
|
|
|
|
/*
|
|
* We should have already pinned the pages when the buffer was first
|
|
* mmap'd, vm_open() just grabs an additional reference for the new
|
|
* mm the vma is getting copied into (ie. on fork()).
|
|
*/
|
|
if (!WARN_ON_ONCE(!shmem->pages_use_count))
|
|
shmem->pages_use_count++;
|
|
|
|
mutex_unlock(&shmem->pages_lock);
|
|
|
|
drm_gem_vm_open(vma);
|
|
}
|
|
|
|
static void drm_gem_shmem_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_object *obj = vma->vm_private_data;
|
|
struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
|
|
|
|
drm_gem_shmem_put_pages(shmem);
|
|
drm_gem_vm_close(vma);
|
|
}
|
|
|
|
const struct vm_operations_struct drm_gem_shmem_vm_ops = {
|
|
.fault = drm_gem_shmem_fault,
|
|
.open = drm_gem_shmem_vm_open,
|
|
.close = drm_gem_shmem_vm_close,
|
|
};
|
|
EXPORT_SYMBOL_GPL(drm_gem_shmem_vm_ops);
|
|
|
|
/**
|
|
* drm_gem_shmem_mmap - Memory-map a shmem GEM object
|
|
* @shmem: shmem GEM object
|
|
* @vma: VMA for the area to be mapped
|
|
*
|
|
* This function implements an augmented version of the GEM DRM file mmap
|
|
* operation for shmem objects.
|
|
*
|
|
* Returns:
|
|
* 0 on success or a negative error code on failure.
|
|
*/
|
|
int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct *vma)
|
|
{
|
|
struct drm_gem_object *obj = &shmem->base;
|
|
int ret;
|
|
|
|
if (obj->import_attach) {
|
|
/* Drop the reference drm_gem_mmap_obj() acquired.*/
|
|
drm_gem_object_put(obj);
|
|
vma->vm_private_data = NULL;
|
|
|
|
return dma_buf_mmap(obj->dma_buf, vma, 0);
|
|
}
|
|
|
|
ret = drm_gem_shmem_get_pages(shmem);
|
|
if (ret)
|
|
return ret;
|
|
|
|
vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
|
|
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
|
|
if (shmem->map_wc)
|
|
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_shmem_mmap);
|
|
|
|
/**
|
|
* drm_gem_shmem_print_info() - Print &drm_gem_shmem_object info for debugfs
|
|
* @shmem: shmem GEM object
|
|
* @p: DRM printer
|
|
* @indent: Tab indentation level
|
|
*/
|
|
void drm_gem_shmem_print_info(const struct drm_gem_shmem_object *shmem,
|
|
struct drm_printer *p, unsigned int indent)
|
|
{
|
|
drm_printf_indent(p, indent, "pages_use_count=%u\n", shmem->pages_use_count);
|
|
drm_printf_indent(p, indent, "vmap_use_count=%u\n", shmem->vmap_use_count);
|
|
drm_printf_indent(p, indent, "vaddr=%p\n", shmem->vaddr);
|
|
}
|
|
EXPORT_SYMBOL(drm_gem_shmem_print_info);
|
|
|
|
/**
|
|
* drm_gem_shmem_get_sg_table - Provide a scatter/gather table of pinned
|
|
* pages for a shmem GEM object
|
|
* @shmem: shmem GEM object
|
|
*
|
|
* This function exports a scatter/gather table suitable for PRIME usage by
|
|
* calling the standard DMA mapping API.
|
|
*
|
|
* Drivers who need to acquire an scatter/gather table for objects need to call
|
|
* drm_gem_shmem_get_pages_sgt() instead.
|
|
*
|
|
* Returns:
|
|
* A pointer to the scatter/gather table of pinned pages or error pointer on failure.
|
|
*/
|
|
struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_shmem_object *shmem)
|
|
{
|
|
struct drm_gem_object *obj = &shmem->base;
|
|
|
|
WARN_ON(shmem->base.import_attach);
|
|
|
|
return drm_prime_pages_to_sg(obj->dev, shmem->pages, obj->size >> PAGE_SHIFT);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_shmem_get_sg_table);
|
|
|
|
/**
|
|
* drm_gem_shmem_get_pages_sgt - Pin pages, dma map them, and return a
|
|
* scatter/gather table for a shmem GEM object.
|
|
* @shmem: shmem GEM object
|
|
*
|
|
* This function returns a scatter/gather table suitable for driver usage. If
|
|
* the sg table doesn't exist, the pages are pinned, dma-mapped, and a sg
|
|
* table created.
|
|
*
|
|
* This is the main function for drivers to get at backing storage, and it hides
|
|
* and difference between dma-buf imported and natively allocated objects.
|
|
* drm_gem_shmem_get_sg_table() should not be directly called by drivers.
|
|
*
|
|
* Returns:
|
|
* A pointer to the scatter/gather table of pinned pages or errno on failure.
|
|
*/
|
|
struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_shmem_object *shmem)
|
|
{
|
|
struct drm_gem_object *obj = &shmem->base;
|
|
int ret;
|
|
struct sg_table *sgt;
|
|
|
|
if (shmem->sgt)
|
|
return shmem->sgt;
|
|
|
|
WARN_ON(obj->import_attach);
|
|
|
|
ret = drm_gem_shmem_get_pages(shmem);
|
|
if (ret)
|
|
return ERR_PTR(ret);
|
|
|
|
sgt = drm_gem_shmem_get_sg_table(shmem);
|
|
if (IS_ERR(sgt)) {
|
|
ret = PTR_ERR(sgt);
|
|
goto err_put_pages;
|
|
}
|
|
/* Map the pages for use by the h/w. */
|
|
ret = dma_map_sgtable(obj->dev->dev, sgt, DMA_BIDIRECTIONAL, 0);
|
|
if (ret)
|
|
goto err_free_sgt;
|
|
|
|
shmem->sgt = sgt;
|
|
|
|
return sgt;
|
|
|
|
err_free_sgt:
|
|
sg_free_table(sgt);
|
|
kfree(sgt);
|
|
err_put_pages:
|
|
drm_gem_shmem_put_pages(shmem);
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_shmem_get_pages_sgt);
|
|
|
|
/**
|
|
* drm_gem_shmem_prime_import_sg_table - Produce a shmem GEM object from
|
|
* another driver's scatter/gather table of pinned pages
|
|
* @dev: Device to import into
|
|
* @attach: DMA-BUF attachment
|
|
* @sgt: Scatter/gather table of pinned pages
|
|
*
|
|
* This function imports a scatter/gather table exported via DMA-BUF by
|
|
* another driver. Drivers that use the shmem helpers should set this as their
|
|
* &drm_driver.gem_prime_import_sg_table callback.
|
|
*
|
|
* Returns:
|
|
* A pointer to a newly created GEM object or an ERR_PTR-encoded negative
|
|
* error code on failure.
|
|
*/
|
|
struct drm_gem_object *
|
|
drm_gem_shmem_prime_import_sg_table(struct drm_device *dev,
|
|
struct dma_buf_attachment *attach,
|
|
struct sg_table *sgt)
|
|
{
|
|
size_t size = PAGE_ALIGN(attach->dmabuf->size);
|
|
struct drm_gem_shmem_object *shmem;
|
|
|
|
shmem = __drm_gem_shmem_create(dev, size, true);
|
|
if (IS_ERR(shmem))
|
|
return ERR_CAST(shmem);
|
|
|
|
shmem->sgt = sgt;
|
|
|
|
drm_dbg_prime(dev, "size = %zu\n", size);
|
|
|
|
return &shmem->base;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_gem_shmem_prime_import_sg_table);
|
|
|
|
MODULE_DESCRIPTION("DRM SHMEM memory-management helpers");
|
|
MODULE_IMPORT_NS(DMA_BUF);
|
|
MODULE_LICENSE("GPL v2");
|