gpu: nvgpu: define error_notifiers in common code

All the linux specific error_notifier codes are defined in linux specific
header file <uapi/linux/nvgpu.h> and used in all the common driver

But since they are defined in linux specific file, we need to move all the
uses of those error_notifiers in linux specific code only

Hence define new error_notifiers in include/nvgpu/error_notifier.h and
use them in the common code

Add new API nvgpu_error_notifier_to_channel_notifier() to convert common
error_notifier of the form NVGPU_ERR_NOTIFIER_* to linux specific error
notifier of the form NVGPU_CHANNEL_*

Any future additions to error notifiers requires update to both the form
of error notifiers

Move all error notifier related metadata from channel_gk20a (common code)
to linux specific structure nvgpu_channel_linux
Update all accesses to this data from new structure instead of channel_gk20a

Move and rename below APIs to linux specific file and declare them
in error_notifier.h
nvgpu_set_error_notifier_locked()
nvgpu_set_error_notifier()
nvgpu_is_error_notifier_set()

Add below new API and use it in fifo_vgpu.c
nvgpu_set_error_notifier_if_empty()

Include <nvgpu/error_notifier.h> wherever new error_notifier codes are used

NVGPU-426

Change-Id: Iaa5bfc150e6e9ec17d797d445c2d6407afe9f4bd
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1593361
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/channel.h b/drivers/gpu/nvgpu/common/linux/channel.h
index ba1935f3..a4df75d6 100644
--- a/drivers/gpu/nvgpu/common/linux/channel.h
+++ b/drivers/gpu/nvgpu/common/linux/channel.h
@@ -42,10 +42,20 @@ struct nvgpu_channel_completion_cb {
         struct work_struct work;
 };
 
+struct nvgpu_error_notifier {
+        struct dma_buf *dmabuf;
+        void *vaddr;
+
+        struct nvgpu_notification *notification;
+
+        struct nvgpu_mutex mutex;
+};
+
 struct nvgpu_channel_linux {
         struct channel_gk20a *ch;
 
         struct nvgpu_channel_completion_cb completion_cb;
+        struct nvgpu_error_notifier error_notifier;
 };
 
 int nvgpu_init_channel_support_linux(struct nvgpu_os_linux *l);