---

yaml
---
r: 304325
b: refs/heads/master
c: 6ad11bc
h: refs/heads/master
i:
  304323: 9f250ab
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: b3f79f980a07fabe22d553fb75010d5d0a12c943
+refs/heads/master: 6ad11bc3a0b84deb39f581ed36e19f82b9393695

trunk/drivers/staging/omapdrm/Makefile

@@ -13,6 +13,7 @@ omapdrm-y := omap_drv.o \
 	omap_fb.o \
 	omap_fbdev.o \
 	omap_gem.o \
+	omap_gem_dmabuf.o \
 	omap_dmm_tiler.o \
 	tcm-sita.o
 

trunk/drivers/staging/omapdrm/omap_drv.c

@@ -746,7 +746,7 @@ static const struct file_operations omapdriver_fops = {
 
 static struct drm_driver omap_drm_driver = {
 		.driver_features =
-				DRIVER_HAVE_IRQ | DRIVER_MODESET | DRIVER_GEM,
+				DRIVER_HAVE_IRQ | DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 		.load = dev_load,
 		.unload = dev_unload,
 		.open = dev_open,
@@ -766,6 +766,8 @@ static struct drm_driver omap_drm_driver = {
 		.debugfs_init = omap_debugfs_init,
 		.debugfs_cleanup = omap_debugfs_cleanup,
 #endif
+		.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+		.gem_prime_export = omap_gem_prime_export,
 		.gem_init_object = omap_gem_init_object,
 		.gem_free_object = omap_gem_free_object,
 		.gem_vm_ops = &omap_gem_vm_ops,

trunk/drivers/staging/omapdrm/omap_drv.h

@@ -148,9 +148,16 @@ int omap_gem_roll(struct drm_gem_object *obj, uint32_t roll);
 int omap_gem_get_paddr(struct drm_gem_object *obj,
 		dma_addr_t *paddr, bool remap);
 int omap_gem_put_paddr(struct drm_gem_object *obj);
+int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
+		bool remap);
+int omap_gem_put_pages(struct drm_gem_object *obj);
+uint32_t omap_gem_flags(struct drm_gem_object *obj);
 uint64_t omap_gem_mmap_offset(struct drm_gem_object *obj);
 size_t omap_gem_mmap_size(struct drm_gem_object *obj);
 
+struct dma_buf * omap_gem_prime_export(struct drm_device *dev,
+		struct drm_gem_object *obj, int flags);
+
 static inline int align_pitch(int pitch, int width, int bpp)
 {
 	int bytespp = (bpp + 7) / 8;

trunk/drivers/staging/omapdrm/omap_gem.c

@@ -266,6 +266,12 @@ static void omap_gem_detach_pages(struct drm_gem_object *obj)
 	omap_obj->pages = NULL;
 }
 
+/* get buffer flags */
+uint32_t omap_gem_flags(struct drm_gem_object *obj)
+{
+	return to_omap_bo(obj)->flags;
+}
+
 /** get mmap offset */
 static uint64_t mmap_offset(struct drm_gem_object *obj)
 {
@@ -764,9 +770,27 @@ static int get_pages(struct drm_gem_object *obj, struct page ***pages)
 	return 0;
 }
 
-int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages)
+/* if !remap, and we don't have pages backing, then fail, rather than
+ * increasing the pin count (which we don't really do yet anyways,
+ * because we don't support swapping pages back out).  And 'remap'
+ * might not be quite the right name, but I wanted to keep it working
+ * similarly to omap_gem_get_paddr().  Note though that mutex is not
+ * aquired if !remap (because this can be called in atomic ctxt),
+ * but probably omap_gem_get_paddr() should be changed to work in the
+ * same way.  If !remap, a matching omap_gem_put_pages() call is not
+ * required (and should not be made).
+ */
+int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
+		bool remap)
 {
 	int ret;
+	if (!remap) {
+		struct omap_gem_object *omap_obj = to_omap_bo(obj);
+		if (!omap_obj->pages)
+			return -ENOMEM;
+		*pages = omap_obj->pages;
+		return 0;
+	}
 	mutex_lock(&obj->dev->struct_mutex);
 	ret = get_pages(obj, pages);
 	mutex_unlock(&obj->dev->struct_mutex);

trunk/drivers/staging/omapdrm/omap_gem_dmabuf.c

@@ -0,0 +1,150 @@
+/*
+ * drivers/staging/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;
+
+out:
+	if (ret)
+		return ERR_PTR(ret);
+	return sg;
+}
+
+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);
+	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);
+	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]);
+}
+
+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,
+};
+
+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, 0600);
+}