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Diffstat (limited to 'drivers/gpu/drm/exynos/exynos_drm_gem.c')
-rw-r--r--drivers/gpu/drm/exynos/exynos_drm_gem.c415
1 files changed, 415 insertions, 0 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
new file mode 100644
index 00000000000..a8e7a88906e
--- /dev/null
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -0,0 +1,415 @@
+/* exynos_drm_gem.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ * Author: Inki Dae <inki.dae@samsung.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include "drmP.h"
+#include "drm.h"
+
+#include <drm/exynos_drm.h>
+
+#include "exynos_drm_drv.h"
+#include "exynos_drm_gem.h"
+#include "exynos_drm_buf.h"
+
+static unsigned int convert_to_vm_err_msg(int msg)
+{
+ unsigned int out_msg;
+
+ switch (msg) {
+ case 0:
+ case -ERESTARTSYS:
+ case -EINTR:
+ out_msg = VM_FAULT_NOPAGE;
+ break;
+
+ case -ENOMEM:
+ out_msg = VM_FAULT_OOM;
+ break;
+
+ default:
+ out_msg = VM_FAULT_SIGBUS;
+ break;
+ }
+
+ return out_msg;
+}
+
+static unsigned int get_gem_mmap_offset(struct drm_gem_object *obj)
+{
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ return (unsigned int)obj->map_list.hash.key << PAGE_SHIFT;
+}
+
+struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_file *file_priv,
+ struct drm_device *dev, unsigned int size,
+ unsigned int *handle)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct exynos_drm_buf_entry *entry;
+ struct drm_gem_object *obj;
+ int ret;
+
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ size = roundup(size, PAGE_SIZE);
+
+ exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
+ if (!exynos_gem_obj) {
+ DRM_ERROR("failed to allocate exynos gem object.\n");
+ return ERR_PTR(-ENOMEM);
+ }
+
+ /* allocate the new buffer object and memory region. */
+ entry = exynos_drm_buf_create(dev, size);
+ if (!entry) {
+ kfree(exynos_gem_obj);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ exynos_gem_obj->entry = entry;
+
+ obj = &exynos_gem_obj->base;
+
+ ret = drm_gem_object_init(dev, obj, size);
+ if (ret < 0) {
+ DRM_ERROR("failed to initailize gem object.\n");
+ goto err_obj_init;
+ }
+
+ DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
+
+ ret = drm_gem_create_mmap_offset(obj);
+ if (ret < 0) {
+ DRM_ERROR("failed to allocate mmap offset.\n");
+ goto err_create_mmap_offset;
+ }
+
+ /*
+ * allocate a id of idr table where the obj is registered
+ * and handle has the id what user can see.
+ */
+ ret = drm_gem_handle_create(file_priv, obj, handle);
+ if (ret)
+ goto err_handle_create;
+
+ DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
+
+ /* drop reference from allocate - handle holds it now. */
+ drm_gem_object_unreference_unlocked(obj);
+
+ return exynos_gem_obj;
+
+err_handle_create:
+ drm_gem_free_mmap_offset(obj);
+
+err_create_mmap_offset:
+ drm_gem_object_release(obj);
+
+err_obj_init:
+ exynos_drm_buf_destroy(dev, exynos_gem_obj->entry);
+
+ kfree(exynos_gem_obj);
+
+ return ERR_PTR(ret);
+}
+
+int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_exynos_gem_create *args = data;
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+
+ DRM_DEBUG_KMS("%s : size = 0x%x\n", __FILE__, args->size);
+
+ exynos_gem_obj = exynos_drm_gem_create(file_priv, dev, args->size,
+ &args->handle);
+ if (IS_ERR(exynos_gem_obj))
+ return PTR_ERR(exynos_gem_obj);
+
+ return 0;
+}
+
+int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_exynos_gem_map_off *args = data;
+
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ DRM_DEBUG_KMS("handle = 0x%x, offset = 0x%lx\n",
+ args->handle, (unsigned long)args->offset);
+
+ if (!(dev->driver->driver_features & DRIVER_GEM)) {
+ DRM_ERROR("does not support GEM.\n");
+ return -ENODEV;
+ }
+
+ return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
+ &args->offset);
+}
+
+static int exynos_drm_gem_mmap_buffer(struct file *filp,
+ struct vm_area_struct *vma)
+{
+ struct drm_gem_object *obj = filp->private_data;
+ struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
+ struct exynos_drm_buf_entry *entry;
+ unsigned long pfn, vm_size;
+
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ vma->vm_flags |= (VM_IO | VM_RESERVED);
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_file = filp;
+
+ vm_size = vma->vm_end - vma->vm_start;
+ /*
+ * a entry contains information to physically continuous memory
+ * allocated by user request or at framebuffer creation.
+ */
+ entry = exynos_gem_obj->entry;
+
+ /* check if user-requested size is valid. */
+ if (vm_size > entry->size)
+ return -EINVAL;
+
+ /*
+ * get page frame number to physical memory to be mapped
+ * to user space.
+ */
+ pfn = exynos_gem_obj->entry->paddr >> PAGE_SHIFT;
+
+ DRM_DEBUG_KMS("pfn = 0x%lx\n", pfn);
+
+ if (remap_pfn_range(vma, vma->vm_start, pfn, vm_size,
+ vma->vm_page_prot)) {
+ DRM_ERROR("failed to remap pfn range.\n");
+ return -EAGAIN;
+ }
+
+ return 0;
+}
+
+static const struct file_operations exynos_drm_gem_fops = {
+ .mmap = exynos_drm_gem_mmap_buffer,
+};
+
+int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
+ struct drm_file *file_priv)
+{
+ struct drm_exynos_gem_mmap *args = data;
+ struct drm_gem_object *obj;
+ unsigned int addr;
+
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ if (!(dev->driver->driver_features & DRIVER_GEM)) {
+ DRM_ERROR("does not support GEM.\n");
+ return -ENODEV;
+ }
+
+ obj = drm_gem_object_lookup(dev, file_priv, args->handle);
+ if (!obj) {
+ DRM_ERROR("failed to lookup gem object.\n");
+ return -EINVAL;
+ }
+
+ obj->filp->f_op = &exynos_drm_gem_fops;
+ obj->filp->private_data = obj;
+
+ down_write(&current->mm->mmap_sem);
+ addr = do_mmap(obj->filp, 0, args->size,
+ PROT_READ | PROT_WRITE, MAP_SHARED, 0);
+ up_write(&current->mm->mmap_sem);
+
+ drm_gem_object_unreference_unlocked(obj);
+
+ if (IS_ERR((void *)addr))
+ return PTR_ERR((void *)addr);
+
+ args->mapped = addr;
+
+ DRM_DEBUG_KMS("mapped = 0x%lx\n", (unsigned long)args->mapped);
+
+ return 0;
+}
+
+int exynos_drm_gem_init_object(struct drm_gem_object *obj)
+{
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ return 0;
+}
+
+void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ DRM_DEBUG_KMS("handle count = %d\n",
+ atomic_read(&gem_obj->handle_count));
+
+ if (gem_obj->map_list.map)
+ drm_gem_free_mmap_offset(gem_obj);
+
+ /* release file pointer to gem object. */
+ drm_gem_object_release(gem_obj);
+
+ exynos_gem_obj = to_exynos_gem_obj(gem_obj);
+
+ exynos_drm_buf_destroy(gem_obj->dev, exynos_gem_obj->entry);
+
+ kfree(exynos_gem_obj);
+}
+
+int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
+ struct drm_device *dev, struct drm_mode_create_dumb *args)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ /*
+ * alocate memory to be used for framebuffer.
+ * - this callback would be called by user application
+ * with DRM_IOCTL_MODE_CREATE_DUMB command.
+ */
+
+ args->pitch = args->width * args->bpp >> 3;
+ args->size = args->pitch * args->height;
+
+ exynos_gem_obj = exynos_drm_gem_create(file_priv, dev, args->size,
+ &args->handle);
+ if (IS_ERR(exynos_gem_obj))
+ return PTR_ERR(exynos_gem_obj);
+
+ return 0;
+}
+
+int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
+ struct drm_device *dev, uint32_t handle, uint64_t *offset)
+{
+ struct exynos_drm_gem_obj *exynos_gem_obj;
+ struct drm_gem_object *obj;
+
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ mutex_lock(&dev->struct_mutex);
+
+ /*
+ * get offset of memory allocated for drm framebuffer.
+ * - this callback would be called by user application
+ * with DRM_IOCTL_MODE_MAP_DUMB command.
+ */
+
+ obj = drm_gem_object_lookup(dev, file_priv, handle);
+ if (!obj) {
+ DRM_ERROR("failed to lookup gem object.\n");
+ mutex_unlock(&dev->struct_mutex);
+ return -EINVAL;
+ }
+
+ exynos_gem_obj = to_exynos_gem_obj(obj);
+
+ *offset = get_gem_mmap_offset(&exynos_gem_obj->base);
+
+ drm_gem_object_unreference(obj);
+
+ DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ return 0;
+}
+
+int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
+{
+ struct drm_gem_object *obj = vma->vm_private_data;
+ struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
+ struct drm_device *dev = obj->dev;
+ unsigned long pfn;
+ pgoff_t page_offset;
+ int ret;
+
+ page_offset = ((unsigned long)vmf->virtual_address -
+ vma->vm_start) >> PAGE_SHIFT;
+
+ mutex_lock(&dev->struct_mutex);
+
+ pfn = (exynos_gem_obj->entry->paddr >> PAGE_SHIFT) + page_offset;
+
+ ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
+
+ mutex_unlock(&dev->struct_mutex);
+
+ return convert_to_vm_err_msg(ret);
+}
+
+int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+ int ret;
+
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ /* set vm_area_struct. */
+ ret = drm_gem_mmap(filp, vma);
+ if (ret < 0) {
+ DRM_ERROR("failed to mmap.\n");
+ return ret;
+ }
+
+ vma->vm_flags &= ~VM_PFNMAP;
+ vma->vm_flags |= VM_MIXEDMAP;
+
+ return ret;
+}
+
+
+int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
+ struct drm_device *dev, unsigned int handle)
+{
+ int ret;
+
+ DRM_DEBUG_KMS("%s\n", __FILE__);
+
+ /*
+ * obj->refcount and obj->handle_count are decreased and
+ * if both them are 0 then exynos_drm_gem_free_object()
+ * would be called by callback to release resources.
+ */
+ ret = drm_gem_handle_delete(file_priv, handle);
+ if (ret < 0) {
+ DRM_ERROR("failed to delete drm_gem_handle.\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
+MODULE_DESCRIPTION("Samsung SoC DRM GEM Module");
+MODULE_LICENSE("GPL");