gpu: nvgpu: move cycle state buffer handler to linux

We use dma_buf pointer cyclestate_buffer_handler in common code
But since this is linux specific, we need to move this out of common code and
into linux specific code

Move dma_buf pointer cyclestate_buffer_handler from common channel code to
struct nvgpu_channel_linux

Fix all pointer accesses to this handle

Move gk20a_channel_free_cycle_stats_buffer() to ioctl_channel.c since it is
mostly linux specific
And since gk20a_channel_free_cycle_stats_buffer() needs to be called while
closing the channel, call it from nvgpu_channel_close_linux()

Jira NVGPU-397
Jira NVGPU-415

Change-Id: Ifb429e49b8f7a1c9e2bc757f3efdd50b28ceca1f
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1603909
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>

drivers/gpu/nvgpu/common/linux/channel.c

@@ -245,6 +245,7 @@ static void nvgpu_channel_close_linux(struct channel_gk20a *ch)
 	nvgpu_channel_work_completion_clear(ch);
 
 #if defined(CONFIG_GK20A_CYCLE_STATS)
+	gk20a_channel_free_cycle_stats_buffer(ch);
 	gk20a_channel_free_cycle_stats_snapshot(ch);
 #endif
 }

drivers/gpu/nvgpu/common/linux/channel.h

@@ -17,6 +17,7 @@
 #define __NVGPU_CHANNEL_H__
 
 #include <linux/workqueue.h>
+#include <linux/dma-buf.h>
 
 #include <nvgpu/types.h>
 
@@ -56,6 +57,8 @@ struct nvgpu_channel_linux {
 
 	struct nvgpu_channel_completion_cb completion_cb;
 	struct nvgpu_error_notifier error_notifier;
+
+	struct dma_buf *cyclestate_buffer_handler;
 };
 
 int nvgpu_init_channel_support_linux(struct nvgpu_os_linux *l);

drivers/gpu/nvgpu/common/linux/ioctl_channel.c

@@ -102,17 +102,35 @@ struct channel_priv {
 
 #if defined(CONFIG_GK20A_CYCLE_STATS)
 
+void gk20a_channel_free_cycle_stats_buffer(struct channel_gk20a *ch)
+{
+	struct nvgpu_channel_linux *priv = ch->os_priv;
+
+	/* disable existing cyclestats buffer */
+	nvgpu_mutex_acquire(&ch->cyclestate.cyclestate_buffer_mutex);
+	if (priv->cyclestate_buffer_handler) {
+		dma_buf_vunmap(priv->cyclestate_buffer_handler,
+				ch->cyclestate.cyclestate_buffer);
+		dma_buf_put(priv->cyclestate_buffer_handler);
+		priv->cyclestate_buffer_handler = NULL;
+		ch->cyclestate.cyclestate_buffer = NULL;
+		ch->cyclestate.cyclestate_buffer_size = 0;
+	}
+	nvgpu_mutex_release(&ch->cyclestate.cyclestate_buffer_mutex);
+}
+
 static int gk20a_channel_cycle_stats(struct channel_gk20a *ch,
 		       struct nvgpu_cycle_stats_args *args)
 {
 	struct dma_buf *dmabuf;
 	void *virtual_address;
+	struct nvgpu_channel_linux *priv = ch->os_priv;
 
 	/* is it allowed to handle calls for current GPU? */
 	if (!nvgpu_is_enabled(ch->g, NVGPU_SUPPORT_CYCLE_STATS))
 		return -ENOSYS;
 
-	if (args->dmabuf_fd && !ch->cyclestate.cyclestate_buffer_handler) {
+	if (args->dmabuf_fd && !priv->cyclestate_buffer_handler) {
 
 		/* set up new cyclestats buffer */
 		dmabuf = dma_buf_get(args->dmabuf_fd);
@@ -122,18 +140,16 @@ static int gk20a_channel_cycle_stats(struct channel_gk20a *ch,
 		if (!virtual_address)
 			return -ENOMEM;
 
-		ch->cyclestate.cyclestate_buffer_handler = dmabuf;
+		priv->cyclestate_buffer_handler = dmabuf;
 		ch->cyclestate.cyclestate_buffer = virtual_address;
 		ch->cyclestate.cyclestate_buffer_size = dmabuf->size;
 		return 0;
 
-	} else if (!args->dmabuf_fd &&
-			ch->cyclestate.cyclestate_buffer_handler) {
+	} else if (!args->dmabuf_fd && priv->cyclestate_buffer_handler) {
 		gk20a_channel_free_cycle_stats_buffer(ch);
 		return 0;
 
-	} else if (!args->dmabuf_fd &&
-			!ch->cyclestate.cyclestate_buffer_handler) {
+	} else if (!args->dmabuf_fd && !priv->cyclestate_buffer_handler) {
 		/* no requst from GL */
 		return 0;
 

drivers/gpu/nvgpu/common/linux/ioctl_channel.h

@@ -37,6 +37,7 @@ 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);
+void gk20a_channel_free_cycle_stats_buffer(struct channel_gk20a *ch);
 
 extern const struct file_operations gk20a_event_id_ops;
 extern const struct file_operations gk20a_channel_ops;

drivers/gpu/nvgpu/gk20a/channel_gk20a.c

@@ -360,24 +360,6 @@ static void gk20a_wait_until_counter_is_N(
 	}
 }
 
-#if defined(CONFIG_GK20A_CYCLE_STATS)
-void gk20a_channel_free_cycle_stats_buffer(struct channel_gk20a *ch)
-{
-	/* disable existing cyclestats buffer */
-	nvgpu_mutex_acquire(&ch->cyclestate.cyclestate_buffer_mutex);
-	if (ch->cyclestate.cyclestate_buffer_handler) {
-		dma_buf_vunmap(ch->cyclestate.cyclestate_buffer_handler,
-				ch->cyclestate.cyclestate_buffer);
-		dma_buf_put(ch->cyclestate.cyclestate_buffer_handler);
-		ch->cyclestate.cyclestate_buffer_handler = NULL;
-		ch->cyclestate.cyclestate_buffer = NULL;
-		ch->cyclestate.cyclestate_buffer_size = 0;
-	}
-	nvgpu_mutex_release(&ch->cyclestate.cyclestate_buffer_mutex);
-}
-
-#endif
-
 /* call ONLY when no references to the channel exist: after the last put */
 static void gk20a_free_channel(struct channel_gk20a *ch, bool force)
 {
@@ -490,10 +472,6 @@ static void gk20a_free_channel(struct channel_gk20a *ch, bool force)
 	nvgpu_big_free(g, ch->gpfifo.pipe);
 	memset(&ch->gpfifo, 0, sizeof(struct gpfifo_desc));
 
-#if defined(CONFIG_GK20A_CYCLE_STATS)
-	gk20a_channel_free_cycle_stats_buffer(ch);
-#endif
-
 	channel_gk20a_free_priv_cmdbuf(ch);
 
 	/* sync must be destroyed before releasing channel vm */

drivers/gpu/nvgpu/gk20a/channel_gk20a.h

@@ -255,7 +255,6 @@ struct channel_gk20a {
 	struct {
 		void *cyclestate_buffer;
 		u32 cyclestate_buffer_size;
-	struct dma_buf *cyclestate_buffer_handler;
 		struct nvgpu_mutex cyclestate_buffer_mutex;
 	} cyclestate;
 
@@ -370,7 +369,6 @@ int gk20a_channel_alloc_gpfifo(struct channel_gk20a *c,
 		unsigned int num_entries,
 		unsigned int num_inflight_jobs,
 		u32 flags);
-void gk20a_channel_free_cycle_stats_buffer(struct channel_gk20a *ch);
 
 void gk20a_channel_timeout_restart_all_channels(struct gk20a *g);