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