From: Zach Reizner <za...@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 <za...@chromium.org>
Signed-off-by: Stphane Marchesin <marc...@chromium.org>
Signed-off-by: Varad Gautam <varad.gau...@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 dfaeea92d344..dca7a3f4791d 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,
        .set_busid = drm_pci_set_busid,
@@ -145,6 +145,15 @@ static struct drm_driver driver = {
        .dumb_create = cirrus_dumb_create,
        .dumb_map_offset = cirrus_dumb_mmap_offset,
        .dumb_destroy = drm_gem_dumb_destroy,
+       .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 8cdf6b0db4a7..29de4f0dbd01 100644
--- a/drivers/gpu/drm/cirrus/cirrus_drv.h
+++ b/drivers/gpu/drm/cirrus/cirrus_drv.h
@@ -164,6 +164,7 @@ 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;
@@ -264,6 +265,15 @@ 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

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