gpu: nvgpu: move snapshot_client memory handling to linux

We right now store dmabuf fd and dma_buf pointer for gk20a_cs_snapshot_client
But since dma_buf and all related APIs are linux specific, we need to remove
them from common code and move them to linux specific code

Add new linux specific structure gk20a_cs_snapshot_client_linux which includes
struct gk20a_cs_snapshot_client and linux specific dma_buf pointer

In gk20a_attach_cycle_stats_snapshot(), we first handle all dma_buf related
operations and then call gr_gk20a_css_attach()

Move gk20a_channel_free_cycle_stats_snapshot() to ioctl_channel.c
In gk20a_channel_free_cycle_stats_snapshot(), we call gr_gk20a_css_detach()
and then free up dma_buf in linux specific code

We also need to call gk20a_channel_free_cycle_stats_snapshot() while closing
the channel, so call it from linux specific nvgpu_channel_close_linux()

Jira NVGPU-397
Jira NVGPU-415

Change-Id: Ida27240541f6adf31f28d7d7ee4f51651c6d3de2
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1603908
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/linux/ioctl_channel.h b/drivers/gpu/nvgpu/common/linux/ioctl_channel.h
index 235d84ef..3ea8d765 100644
--- a/drivers/gpu/nvgpu/common/linux/ioctl_channel.h
+++ b/drivers/gpu/nvgpu/common/linux/ioctl_channel.h
@@ -15,11 +15,20 @@
 
 #include <linux/fs.h>
 
+#include "gk20a/css_gr_gk20a.h"
+
 struct inode;
 struct file;
 struct gk20a;
 struct nvgpu_channel_open_args;
 
+struct gk20a_cs_snapshot_client_linux {
+        struct gk20a_cs_snapshot_client cs_client;
+
+        u32                     dmabuf_fd;
+        struct dma_buf          *dma_handler;
+};
+
 int gk20a_channel_open(struct inode *inode, struct file *filp);
 int gk20a_channel_release(struct inode *inode, struct file *filp);
 long gk20a_channel_ioctl(struct file *filp,
@@ -27,6 +36,8 @@ long gk20a_channel_ioctl(struct file *filp,
 int gk20a_channel_open_ioctl(struct gk20a *g,
                 struct nvgpu_channel_open_args *args);
 
+int gk20a_channel_free_cycle_stats_snapshot(struct channel_gk20a *ch);
+
 extern const struct file_operations gk20a_event_id_ops;
 extern const struct file_operations gk20a_channel_ops;