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path: root/drivers/gpu/drm/vkms/vkms_gem.c
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Diffstat (limited to 'drivers/gpu/drm/vkms/vkms_gem.c')
-rw-r--r--drivers/gpu/drm/vkms/vkms_gem.c179
1 files changed, 179 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vkms/vkms_gem.c b/drivers/gpu/drm/vkms/vkms_gem.c
new file mode 100644
index 000000000000..c7e38368602b
--- /dev/null
+++ b/drivers/gpu/drm/vkms/vkms_gem.c
@@ -0,0 +1,179 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <linux/shmem_fs.h>
+
+#include "vkms_drv.h"
+
+static struct vkms_gem_object *__vkms_gem_create(struct drm_device *dev,
+ u64 size)
+{
+ struct vkms_gem_object *obj;
+ int ret;
+
+ obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+ if (!obj)
+ return ERR_PTR(-ENOMEM);
+
+ size = roundup(size, PAGE_SIZE);
+ ret = drm_gem_object_init(dev, &obj->gem, size);
+ if (ret) {
+ kfree(obj);
+ return ERR_PTR(ret);
+ }
+
+ mutex_init(&obj->pages_lock);
+
+ return obj;
+}
+
+void vkms_gem_free_object(struct drm_gem_object *obj)
+{
+ struct vkms_gem_object *gem = container_of(obj, struct vkms_gem_object,
+ gem);
+
+ kvfree(gem->pages);
+ mutex_destroy(&gem->pages_lock);
+ drm_gem_object_release(obj);
+ kfree(gem);
+}
+
+int vkms_gem_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct vkms_gem_object *obj = vma->vm_private_data;
+ unsigned long vaddr = vmf->address;
+ pgoff_t page_offset;
+ loff_t num_pages;
+ int ret;
+
+ page_offset = (vaddr - vma->vm_start) >> PAGE_SHIFT;
+ num_pages = DIV_ROUND_UP(obj->gem.size, PAGE_SIZE);
+
+ if (page_offset > num_pages)
+ return VM_FAULT_SIGBUS;
+
+ ret = -ENOENT;
+ mutex_lock(&obj->pages_lock);
+ if (obj->pages) {
+ get_page(obj->pages[page_offset]);
+ vmf->page = obj->pages[page_offset];
+ ret = 0;
+ }
+ mutex_unlock(&obj->pages_lock);
+ if (ret) {
+ struct page *page;
+ struct address_space *mapping;
+
+ mapping = file_inode(obj->gem.filp)->i_mapping;
+ page = shmem_read_mapping_page(mapping, page_offset);
+
+ if (!IS_ERR(page)) {
+ vmf->page = page;
+ ret = 0;
+ } else {
+ switch (PTR_ERR(page)) {
+ case -ENOSPC:
+ case -ENOMEM:
+ ret = VM_FAULT_OOM;
+ break;
+ case -EBUSY:
+ ret = VM_FAULT_RETRY;
+ break;
+ case -EFAULT:
+ case -EINVAL:
+ ret = VM_FAULT_SIGBUS;
+ break;
+ default:
+ WARN_ON(PTR_ERR(page));
+ ret = VM_FAULT_SIGBUS;
+ break;
+ }
+ }
+ }
+ return ret;
+}
+
+struct drm_gem_object *vkms_gem_create(struct drm_device *dev,
+ struct drm_file *file,
+ u32 *handle,
+ u64 size)
+{
+ struct vkms_gem_object *obj;
+ int ret;
+
+ if (!file || !dev || !handle)
+ return ERR_PTR(-EINVAL);
+
+ obj = __vkms_gem_create(dev, size);
+ if (IS_ERR(obj))
+ return ERR_CAST(obj);
+
+ ret = drm_gem_handle_create(file, &obj->gem, handle);
+ drm_gem_object_put_unlocked(&obj->gem);
+ if (ret) {
+ drm_gem_object_release(&obj->gem);
+ kfree(obj);
+ return ERR_PTR(ret);
+ }
+
+ return &obj->gem;
+}
+
+int vkms_dumb_create(struct drm_file *file, struct drm_device *dev,
+ struct drm_mode_create_dumb *args)
+{
+ struct drm_gem_object *gem_obj;
+ u64 pitch, size;
+
+ if (!args || !dev || !file)
+ return -EINVAL;
+
+ pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
+ size = pitch * args->height;
+
+ if (!size)
+ return -EINVAL;
+
+ gem_obj = vkms_gem_create(dev, file, &args->handle, size);
+ if (IS_ERR(gem_obj))
+ return PTR_ERR(gem_obj);
+
+ args->size = gem_obj->size;
+ args->pitch = pitch;
+
+ DRM_DEBUG_DRIVER("Created object of size %lld\n", size);
+
+ return 0;
+}
+
+int vkms_dumb_map(struct drm_file *file, struct drm_device *dev,
+ u32 handle, u64 *offset)
+{
+ struct drm_gem_object *obj;
+ int ret;
+
+ obj = drm_gem_object_lookup(file, handle);
+ if (!obj)
+ return -ENOENT;
+
+ if (!obj->filp) {
+ ret = -EINVAL;
+ goto unref;
+ }
+
+ ret = drm_gem_create_mmap_offset(obj);
+ if (ret)
+ goto unref;
+
+ *offset = drm_vma_node_offset_addr(&obj->vma_node);
+unref:
+ drm_gem_object_put_unlocked(obj);
+
+ return ret;
+}