summaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
diff options
context:
space:
mode:
authorRob Clark <robdclark@gmail.com>2013-02-11 12:43:09 -0500
committerRob Clark <robdclark@gmail.com>2013-02-16 17:38:06 -0500
commit8bb0daffb0b8e45188066255b4203446eae181f1 (patch)
treec1a324b863df57becdfab54c9325231bbb853b56 /drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
parenta4462f246c8821f625f45bce52c7ca7e0207dffe (diff)
downloadlinux-8bb0daffb0b8e45188066255b4203446eae181f1.tar.bz2
drm/omap: move out of staging
Now that the omapdss interface has been reworked so that omapdrm can use dispc directly, we have been able to fix the remaining functional kms issues with omapdrm. And in the mean time the PM sequencing and many other of that open issues have been solved. So I think it makes sense to finally move omapdrm out of staging. Signed-off-by: Rob Clark <robdclark@gmail.com>
Diffstat (limited to 'drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c')
-rw-r--r--drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c225
1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
new file mode 100644
index 000000000000..ac74d1bc67bf
--- /dev/null
+++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
@@ -0,0 +1,225 @@
+/*
+ * drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
+ *
+ * Copyright (C) 2011 Texas Instruments
+ * Author: Rob Clark <rob.clark@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "omap_drv.h"
+
+#include <linux/dma-buf.h>
+
+static struct sg_table *omap_gem_map_dma_buf(
+ struct dma_buf_attachment *attachment,
+ enum dma_data_direction dir)
+{
+ struct drm_gem_object *obj = attachment->dmabuf->priv;
+ struct sg_table *sg;
+ dma_addr_t paddr;
+ int ret;
+
+ sg = kzalloc(sizeof(*sg), GFP_KERNEL);
+ if (!sg)
+ return ERR_PTR(-ENOMEM);
+
+ /* camera, etc, need physically contiguous.. but we need a
+ * better way to know this..
+ */
+ ret = omap_gem_get_paddr(obj, &paddr, true);
+ if (ret)
+ goto out;
+
+ ret = sg_alloc_table(sg, 1, GFP_KERNEL);
+ if (ret)
+ goto out;
+
+ sg_init_table(sg->sgl, 1);
+ sg_dma_len(sg->sgl) = obj->size;
+ sg_set_page(sg->sgl, pfn_to_page(PFN_DOWN(paddr)), obj->size, 0);
+ sg_dma_address(sg->sgl) = paddr;
+
+ /* this should be after _get_paddr() to ensure we have pages attached */
+ omap_gem_dma_sync(obj, dir);
+
+ return sg;
+out:
+ kfree(sg);
+ return ERR_PTR(ret);
+}
+
+static void omap_gem_unmap_dma_buf(struct dma_buf_attachment *attachment,
+ struct sg_table *sg, enum dma_data_direction dir)
+{
+ struct drm_gem_object *obj = attachment->dmabuf->priv;
+ omap_gem_put_paddr(obj);
+ sg_free_table(sg);
+ kfree(sg);
+}
+
+static void omap_gem_dmabuf_release(struct dma_buf *buffer)
+{
+ struct drm_gem_object *obj = buffer->priv;
+ /* release reference that was taken when dmabuf was exported
+ * in omap_gem_prime_set()..
+ */
+ drm_gem_object_unreference_unlocked(obj);
+}
+
+
+static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
+ size_t start, size_t len, enum dma_data_direction dir)
+{
+ struct drm_gem_object *obj = buffer->priv;
+ struct page **pages;
+ if (omap_gem_flags(obj) & OMAP_BO_TILED) {
+ /* TODO we would need to pin at least part of the buffer to
+ * get de-tiled view. For now just reject it.
+ */
+ return -ENOMEM;
+ }
+ /* make sure we have the pages: */
+ return omap_gem_get_pages(obj, &pages, true);
+}
+
+static void omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
+ size_t start, size_t len, enum dma_data_direction dir)
+{
+ struct drm_gem_object *obj = buffer->priv;
+ omap_gem_put_pages(obj);
+}
+
+
+static void *omap_gem_dmabuf_kmap_atomic(struct dma_buf *buffer,
+ unsigned long page_num)
+{
+ struct drm_gem_object *obj = buffer->priv;
+ struct page **pages;
+ omap_gem_get_pages(obj, &pages, false);
+ omap_gem_cpu_sync(obj, page_num);
+ return kmap_atomic(pages[page_num]);
+}
+
+static void omap_gem_dmabuf_kunmap_atomic(struct dma_buf *buffer,
+ unsigned long page_num, void *addr)
+{
+ kunmap_atomic(addr);
+}
+
+static void *omap_gem_dmabuf_kmap(struct dma_buf *buffer,
+ unsigned long page_num)
+{
+ struct drm_gem_object *obj = buffer->priv;
+ struct page **pages;
+ omap_gem_get_pages(obj, &pages, false);
+ omap_gem_cpu_sync(obj, page_num);
+ return kmap(pages[page_num]);
+}
+
+static void omap_gem_dmabuf_kunmap(struct dma_buf *buffer,
+ unsigned long page_num, void *addr)
+{
+ struct drm_gem_object *obj = buffer->priv;
+ struct page **pages;
+ omap_gem_get_pages(obj, &pages, false);
+ kunmap(pages[page_num]);
+}
+
+/*
+ * TODO maybe we can split up drm_gem_mmap to avoid duplicating
+ * some here.. or at least have a drm_dmabuf_mmap helper.
+ */
+static int omap_gem_dmabuf_mmap(struct dma_buf *buffer,
+ struct vm_area_struct *vma)
+{
+ struct drm_gem_object *obj = buffer->priv;
+ int ret = 0;
+
+ if (WARN_ON(!obj->filp))
+ return -EINVAL;
+
+ /* Check for valid size. */
+ if (omap_gem_mmap_size(obj) < vma->vm_end - vma->vm_start) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ if (!obj->dev->driver->gem_vm_ops) {
+ ret = -EINVAL;
+ goto out_unlock;
+ }
+
+ vma->vm_flags |= VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;
+ vma->vm_ops = obj->dev->driver->gem_vm_ops;
+ vma->vm_private_data = obj;
+ vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+
+ /* Take a ref for this mapping of the object, so that the fault
+ * handler can dereference the mmap offset's pointer to the object.
+ * This reference is cleaned up by the corresponding vm_close
+ * (which should happen whether the vma was created by this call, or
+ * by a vm_open due to mremap or partial unmap or whatever).
+ */
+ vma->vm_ops->open(vma);
+
+out_unlock:
+
+ return omap_gem_mmap_obj(obj, vma);
+}
+
+struct dma_buf_ops omap_dmabuf_ops = {
+ .map_dma_buf = omap_gem_map_dma_buf,
+ .unmap_dma_buf = omap_gem_unmap_dma_buf,
+ .release = omap_gem_dmabuf_release,
+ .begin_cpu_access = omap_gem_dmabuf_begin_cpu_access,
+ .end_cpu_access = omap_gem_dmabuf_end_cpu_access,
+ .kmap_atomic = omap_gem_dmabuf_kmap_atomic,
+ .kunmap_atomic = omap_gem_dmabuf_kunmap_atomic,
+ .kmap = omap_gem_dmabuf_kmap,
+ .kunmap = omap_gem_dmabuf_kunmap,
+ .mmap = omap_gem_dmabuf_mmap,
+};
+
+struct dma_buf *omap_gem_prime_export(struct drm_device *dev,
+ struct drm_gem_object *obj, int flags)
+{
+ return dma_buf_export(obj, &omap_dmabuf_ops, obj->size, flags);
+}
+
+struct drm_gem_object *omap_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *buffer)
+{
+ struct drm_gem_object *obj;
+
+ /* is this one of own objects? */
+ if (buffer->ops == &omap_dmabuf_ops) {
+ obj = buffer->priv;
+ /* is it from our device? */
+ if (obj->dev == dev) {
+ /*
+ * Importing dmabuf exported from out own gem increases
+ * refcount on gem itself instead of f_count of dmabuf.
+ */
+ drm_gem_object_reference(obj);
+ dma_buf_put(buffer);
+ return obj;
+ }
+ }
+
+ /*
+ * TODO add support for importing buffers from other devices..
+ * for now we don't need this but would be nice to add eventually
+ */
+ return ERR_PTR(-EINVAL);
+}