[PATCH 06/12] drm/cirrus: implement PRIME export for cirrus

[Varad Gautam]

From: Zach Reizner <zachr at chromium.org>

This patch implements PRIME export, but not import for cirrus.

initially reviewed at:
https://chromium-review.googlesource.com/229688
https://chromium-review.googlesource.com/339057

Signed-off-by: Zach Reizner <zachr at chromium.org>
Signed-off-by: Stphane Marchesin <marcheu at chromium.org>
Signed-off-by: Varad Gautam <varad.gautam at collabora.com>
---
 drivers/gpu/drm/cirrus/Makefile       |  2 +-
 drivers/gpu/drm/cirrus/cirrus_drv.c   | 11 +++++-
 drivers/gpu/drm/cirrus/cirrus_drv.h   | 10 ++++++
 drivers/gpu/drm/cirrus/cirrus_prime.c | 63 +++++++++++++++++++++++++++++++++++
 4 files changed, 84 insertions(+), 2 deletions(-)
 create mode 100644 drivers/gpu/drm/cirrus/cirrus_prime.c

diff --git a/drivers/gpu/drm/cirrus/Makefile b/drivers/gpu/drm/cirrus/Makefile
index 919c0a336c97..f6bcc21454c6 100644
--- a/drivers/gpu/drm/cirrus/Makefile
+++ b/drivers/gpu/drm/cirrus/Makefile
@@ -1,4 +1,4 @@
 cirrus-y  := cirrus_main.o cirrus_mode.o \
-	cirrus_drv.o cirrus_fbdev.o cirrus_ttm.o
+	cirrus_drv.o cirrus_fbdev.o cirrus_ttm.o cirrus_prime.o
 
 obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus.o
diff --git a/drivers/gpu/drm/cirrus/cirrus_drv.c b/drivers/gpu/drm/cirrus/cirrus_drv.c
index 452059780ddc..09461868ed46 100644
--- a/drivers/gpu/drm/cirrus/cirrus_drv.c
+++ b/drivers/gpu/drm/cirrus/cirrus_drv.c
@@ -130,7 +130,7 @@ static const struct file_operations cirrus_driver_fops = {
 	.compat_ioctl = drm_compat_ioctl,
 };
 static struct drm_driver driver = {
-	.driver_features = DRIVER_MODESET | DRIVER_GEM,
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
 	.load = cirrus_driver_load,
 	.unload = cirrus_driver_unload,
 	.fops = &cirrus_driver_fops,
@@ -143,6 +143,15 @@ static struct drm_driver driver = {
 	.gem_free_object_unlocked = cirrus_gem_free_object,
 	.dumb_create = cirrus_dumb_create,
 	.dumb_map_offset = cirrus_dumb_mmap_offset,
+	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+	.gem_prime_export = drm_gem_prime_export,
+	.gem_prime_import = drm_gem_prime_import,
+	.gem_prime_pin = cirrus_gem_prime_pin,
+	.gem_prime_get_sg_table = cirrus_gem_prime_get_sg_table,
+	.gem_prime_import_sg_table = cirrus_gem_prime_import_sg_table,
+	.gem_prime_vmap = cirrus_gem_prime_vmap,
+	.gem_prime_vunmap = cirrus_gem_prime_vunmap,
 };
 
 static const struct dev_pm_ops cirrus_pm_ops = {
diff --git a/drivers/gpu/drm/cirrus/cirrus_drv.h b/drivers/gpu/drm/cirrus/cirrus_drv.h
index e16b86dd6c19..8c43cc963027 100644
--- a/drivers/gpu/drm/cirrus/cirrus_drv.h
+++ b/drivers/gpu/drm/cirrus/cirrus_drv.h
@@ -163,6 +163,7 @@ struct cirrus_bo {
 	struct ttm_buffer_object bo;
 	struct ttm_placement placement;
 	struct ttm_bo_kmap_obj kmap;
+	struct ttm_bo_kmap_obj dma_buf_vmap;
 	struct drm_gem_object gem;
 	struct ttm_place placements[3];
 	int pin_count;
@@ -256,6 +257,15 @@ int cirrus_bo_push_sysram(struct cirrus_bo *bo);
 int cirrus_bo_pin(struct cirrus_bo *bo, u32 pl_flag, u64 *gpu_addr);
 int cirrus_bo_unpin(struct cirrus_bo *bo);
 
+struct sg_table *cirrus_gem_prime_get_sg_table(struct drm_gem_object *obj);
+void *cirrus_gem_prime_vmap(struct drm_gem_object *obj);
+void cirrus_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
+struct drm_gem_object *cirrus_gem_prime_import_sg_table(
+				struct drm_device *dev,
+				struct dma_buf_attachment *attach,
+				struct sg_table *sgt);
+int cirrus_gem_prime_pin(struct drm_gem_object *obj);
+
 extern int cirrus_bpp;
 
 #endif				/* __CIRRUS_DRV_H__ */
diff --git a/drivers/gpu/drm/cirrus/cirrus_prime.c b/drivers/gpu/drm/cirrus/cirrus_prime.c
new file mode 100644
index 000000000000..a7fe6c73bfb6
--- /dev/null
+++ b/drivers/gpu/drm/cirrus/cirrus_prime.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright © 2014 The Chromium OS Authors
+ *
+ * This file is subject to the terms and conditions of the GNU General
+ * Public License version 2. See the file COPYING in the main
+ * directory of this archive for more details.
+ *
+ */
+
+#include <drm/ttm/ttm_page_alloc.h>
+#include <drm/drmP.h>
+#include "cirrus_drv.h"
+
+struct sg_table *cirrus_gem_prime_get_sg_table(struct drm_gem_object *obj)
+{
+	struct cirrus_bo *cirrusbo = gem_to_cirrus_bo(obj);
+	unsigned long npages = cirrusbo->bo.num_pages;
+
+	return drm_prime_pages_to_sg(cirrusbo->bo.ttm->pages, npages);
+}
+
+void *cirrus_gem_prime_vmap(struct drm_gem_object *obj)
+{
+	struct cirrus_bo *cirrusbo = gem_to_cirrus_bo(obj);
+	int ret;
+
+	ret = ttm_bo_kmap(&cirrusbo->bo, 0, cirrusbo->bo.num_pages,
+			  &cirrusbo->dma_buf_vmap);
+	if (ret)
+		return ERR_PTR(ret);
+
+	return cirrusbo->dma_buf_vmap.virtual;
+}
+
+void cirrus_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
+{
+	struct cirrus_bo *cirrusbo = gem_to_cirrus_bo(obj);
+
+	ttm_bo_kunmap(&cirrusbo->dma_buf_vmap);
+}
+
+struct drm_gem_object *cirrus_gem_prime_import_sg_table(
+				struct drm_device *dev,
+				struct dma_buf_attachment *attach,
+				struct sg_table *sgt)
+{
+	return NULL;
+}
+
+int cirrus_gem_prime_pin(struct drm_gem_object *obj)
+{
+	struct cirrus_bo *cirrusbo = gem_to_cirrus_bo(obj);
+	int ret = 0;
+
+	ret = cirrus_bo_pin(cirrusbo, TTM_PL_FLAG_SYSTEM, NULL);
+	if (ret)
+		goto out;
+
+	ttm_pool_populate(cirrusbo->bo.ttm);
+
+out:
+	return ret;
+}
-- 
2.13.1