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![Haixia Shi](/assets/img/avatar_default.png)
Fixes dmabuf export failure with -E_NOMEM when the page is not mapped. Signed-off-by: Haixia Shi <hshi@chromium.org> Reviewed-by: Stéphane Marchesin <marcheu@chromium.org> Signed-off-by: Dave Airlie <airlied@redhat.com>
241 lines
4.9 KiB
C
241 lines
4.9 KiB
C
/*
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* Copyright (C) 2012 Red Hat
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License v2. See the file COPYING in the main directory of this archive for
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* more details.
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*/
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#include <drm/drmP.h>
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#include "udl_drv.h"
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#include <linux/shmem_fs.h>
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#include <linux/dma-buf.h>
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struct udl_gem_object *udl_gem_alloc_object(struct drm_device *dev,
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size_t size)
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{
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struct udl_gem_object *obj;
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obj = kzalloc(sizeof(*obj), GFP_KERNEL);
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if (obj == NULL)
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return NULL;
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if (drm_gem_object_init(dev, &obj->base, size) != 0) {
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kfree(obj);
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return NULL;
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}
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obj->flags = UDL_BO_CACHEABLE;
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return obj;
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}
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static int
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udl_gem_create(struct drm_file *file,
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struct drm_device *dev,
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uint64_t size,
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uint32_t *handle_p)
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{
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struct udl_gem_object *obj;
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int ret;
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u32 handle;
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size = roundup(size, PAGE_SIZE);
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obj = udl_gem_alloc_object(dev, size);
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if (obj == NULL)
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return -ENOMEM;
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ret = drm_gem_handle_create(file, &obj->base, &handle);
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if (ret) {
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drm_gem_object_release(&obj->base);
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kfree(obj);
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return ret;
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}
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drm_gem_object_unreference(&obj->base);
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*handle_p = handle;
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return 0;
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}
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static void update_vm_cache_attr(struct udl_gem_object *obj,
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struct vm_area_struct *vma)
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{
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DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
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/* non-cacheable as default. */
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if (obj->flags & UDL_BO_CACHEABLE) {
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vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
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} else if (obj->flags & UDL_BO_WC) {
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vma->vm_page_prot =
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pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
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} else {
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vma->vm_page_prot =
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pgprot_noncached(vm_get_page_prot(vma->vm_flags));
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}
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}
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int udl_dumb_create(struct drm_file *file,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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args->pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
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args->size = args->pitch * args->height;
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return udl_gem_create(file, dev,
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args->size, &args->handle);
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}
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int udl_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret)
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return ret;
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_flags |= VM_MIXEDMAP;
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update_vm_cache_attr(to_udl_bo(vma->vm_private_data), vma);
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return ret;
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}
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int udl_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct udl_gem_object *obj = to_udl_bo(vma->vm_private_data);
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struct page *page;
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unsigned int page_offset;
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int ret = 0;
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page_offset = ((unsigned long)vmf->virtual_address - vma->vm_start) >>
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PAGE_SHIFT;
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if (!obj->pages)
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return VM_FAULT_SIGBUS;
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page = obj->pages[page_offset];
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ret = vm_insert_page(vma, (unsigned long)vmf->virtual_address, page);
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switch (ret) {
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case -EAGAIN:
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case 0:
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case -ERESTARTSYS:
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return VM_FAULT_NOPAGE;
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case -ENOMEM:
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return VM_FAULT_OOM;
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default:
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return VM_FAULT_SIGBUS;
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}
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}
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int udl_gem_get_pages(struct udl_gem_object *obj)
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{
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struct page **pages;
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if (obj->pages)
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return 0;
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pages = drm_gem_get_pages(&obj->base);
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if (IS_ERR(pages))
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return PTR_ERR(pages);
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obj->pages = pages;
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return 0;
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}
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void udl_gem_put_pages(struct udl_gem_object *obj)
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{
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if (obj->base.import_attach) {
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drm_free_large(obj->pages);
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obj->pages = NULL;
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return;
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}
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drm_gem_put_pages(&obj->base, obj->pages, false, false);
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obj->pages = NULL;
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}
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int udl_gem_vmap(struct udl_gem_object *obj)
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{
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int page_count = obj->base.size / PAGE_SIZE;
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int ret;
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if (obj->base.import_attach) {
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obj->vmapping = dma_buf_vmap(obj->base.import_attach->dmabuf);
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if (!obj->vmapping)
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return -ENOMEM;
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return 0;
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}
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ret = udl_gem_get_pages(obj);
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if (ret)
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return ret;
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obj->vmapping = vmap(obj->pages, page_count, 0, PAGE_KERNEL);
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if (!obj->vmapping)
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return -ENOMEM;
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return 0;
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}
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void udl_gem_vunmap(struct udl_gem_object *obj)
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{
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if (obj->base.import_attach) {
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dma_buf_vunmap(obj->base.import_attach->dmabuf, obj->vmapping);
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return;
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}
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vunmap(obj->vmapping);
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udl_gem_put_pages(obj);
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}
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void udl_gem_free_object(struct drm_gem_object *gem_obj)
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{
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struct udl_gem_object *obj = to_udl_bo(gem_obj);
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if (obj->vmapping)
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udl_gem_vunmap(obj);
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if (gem_obj->import_attach) {
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drm_prime_gem_destroy(gem_obj, obj->sg);
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put_device(gem_obj->dev->dev);
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}
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if (obj->pages)
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udl_gem_put_pages(obj);
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drm_gem_free_mmap_offset(gem_obj);
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}
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/* the dumb interface doesn't work with the GEM straight MMAP
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interface, it expects to do MMAP on the drm fd, like normal */
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int udl_gem_mmap(struct drm_file *file, struct drm_device *dev,
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uint32_t handle, uint64_t *offset)
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{
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struct udl_gem_object *gobj;
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struct drm_gem_object *obj;
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int ret = 0;
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mutex_lock(&dev->struct_mutex);
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obj = drm_gem_object_lookup(dev, file, handle);
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if (obj == NULL) {
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ret = -ENOENT;
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goto unlock;
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}
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gobj = to_udl_bo(obj);
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ret = udl_gem_get_pages(gobj);
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if (ret)
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goto out;
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ret = drm_gem_create_mmap_offset(obj);
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if (ret)
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goto out;
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*offset = drm_vma_node_offset_addr(&gobj->base.vma_node);
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out:
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drm_gem_object_unreference(&gobj->base);
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unlock:
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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