gpu: nvgpu: add CSS hal to get max buffer size

Currently max_css_buffer_size is incorrectly stored in struct nvgpu_gr

Add a new hal g->ops.css.get_max_buffer_size() to get the size and
remove the variable from struct nvgpu_gr

Jira NVGPU-3125

Change-Id: If78fd86559526b84031051e281a98327a46fc11d
Signed-off-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2105652
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

drivers/gpu/nvgpu/common/gr/gr_priv.h

@@ -81,7 +81,6 @@ struct nvgpu_gr {
 	u32 fbp_en_mask;
 	u32 *fbp_rop_l2_en_mask;
 
-	u32 max_css_buffer_size;
 	u32 max_ctxsw_ring_buffer_size;
 
 	struct nvgpu_mutex ctxsw_disable_mutex;

drivers/gpu/nvgpu/common/perf/cyclestats_snapshot.c

@@ -599,3 +599,8 @@ int nvgpu_css_check_data_available(struct channel_gk20a *ch, u32 *pending,
 	*hw_overflow = nvgpu_css_get_overflow_status(g);
 	return 0;
 }
+
+u32 nvgpu_css_get_max_buffer_size(struct gk20a *g)
+{
+	return 0xffffffffU;
+}

drivers/gpu/nvgpu/common/vgpu/gp10b/vgpu_hal_gp10b.c

@@ -728,6 +728,7 @@ static const struct gpu_ops vgpu_gp10b_ops = {
 		.set_handled_snapshots = NULL,
 		.allocate_perfmon_ids = NULL,
 		.release_perfmon_ids = NULL,
+		.get_max_buffer_size = vgpu_css_get_buffer_size,
 	},
 #endif
 	.priv_ring = {

drivers/gpu/nvgpu/common/vgpu/gr/gr_vgpu.c

@@ -1231,14 +1231,15 @@ void vgpu_gr_init_cyclestats(struct gk20a *g)
 {
 #if defined(CONFIG_GK20A_CYCLE_STATS)
 	bool snapshots_supported = true;
+	u32 max_css_buffer_size;
 
 	/* cyclestats not supported on vgpu */
 	nvgpu_set_enabled(g, NVGPU_SUPPORT_CYCLE_STATS, false);
 
-	g->gr->max_css_buffer_size = vgpu_css_get_buffer_size(g);
+	max_css_buffer_size = vgpu_css_get_buffer_size(g);
 
 	/* snapshots not supported if the buffer size is 0 */
-	if (g->gr->max_css_buffer_size == 0) {
+	if (max_css_buffer_size == 0) {
 		snapshots_supported = false;
 	}
 

drivers/gpu/nvgpu/common/vgpu/gv11b/vgpu_hal_gv11b.c

@@ -825,6 +825,7 @@ static const struct gpu_ops vgpu_gv11b_ops = {
 		.set_handled_snapshots = NULL,
 		.allocate_perfmon_ids = NULL,
 		.release_perfmon_ids = NULL,
+		.get_max_buffer_size = vgpu_css_get_buffer_size,
 	},
 #endif
 	.priv_ring = {

drivers/gpu/nvgpu/gm20b/gr_gm20b.c

@@ -492,7 +492,6 @@ void gr_gm20b_init_cyclestats(struct gk20a *g)
 #if defined(CONFIG_GK20A_CYCLE_STATS)
 	nvgpu_set_enabled(g, NVGPU_SUPPORT_CYCLE_STATS, true);
 	nvgpu_set_enabled(g, NVGPU_SUPPORT_CYCLE_STATS_SNAPSHOT, true);
-	g->gr->max_css_buffer_size = 0xffffffffU;
 #else
 	(void)g;
 #endif

drivers/gpu/nvgpu/hal/init/hal_gm20b.c

@@ -1029,6 +1029,7 @@ static const struct gpu_ops gm20b_ops = {
 		.release_perfmon_ids = nvgpu_css_release_perfmon_ids,
 		.get_overflow_status = nvgpu_css_get_overflow_status,
 		.get_pending_snapshots = nvgpu_css_get_pending_snapshots,
+		.get_max_buffer_size = nvgpu_css_get_max_buffer_size,
 	},
 #endif
 	.falcon = {

drivers/gpu/nvgpu/hal/init/hal_gp10b.c

@@ -1109,6 +1109,7 @@ static const struct gpu_ops gp10b_ops = {
 		.release_perfmon_ids = nvgpu_css_release_perfmon_ids,
 		.get_overflow_status = nvgpu_css_get_overflow_status,
 		.get_pending_snapshots = nvgpu_css_get_pending_snapshots,
+		.get_max_buffer_size = nvgpu_css_get_max_buffer_size,
 	},
 #endif
 	.falcon = {

drivers/gpu/nvgpu/hal/init/hal_gv100.c

@@ -1312,6 +1312,7 @@ static const struct gpu_ops gv100_ops = {
 		.release_perfmon_ids = nvgpu_css_release_perfmon_ids,
 		.get_overflow_status = nvgpu_css_get_overflow_status,
 		.get_pending_snapshots = nvgpu_css_get_pending_snapshots,
+		.get_max_buffer_size = nvgpu_css_get_max_buffer_size,
 	},
 #endif
 	.xve = {

drivers/gpu/nvgpu/hal/init/hal_gv11b.c

@@ -1299,6 +1299,7 @@ static const struct gpu_ops gv11b_ops = {
 		.release_perfmon_ids = nvgpu_css_release_perfmon_ids,
 		.get_overflow_status = nvgpu_css_get_overflow_status,
 		.get_pending_snapshots = nvgpu_css_get_pending_snapshots,
+		.get_max_buffer_size = nvgpu_css_get_max_buffer_size,
 	},
 #endif
 	.falcon = {

drivers/gpu/nvgpu/hal/init/hal_tu104.c

@@ -1357,6 +1357,7 @@ static const struct gpu_ops tu104_ops = {
 		.release_perfmon_ids = nvgpu_css_release_perfmon_ids,
 		.get_overflow_status = nvgpu_css_get_overflow_status,
 		.get_pending_snapshots = nvgpu_css_get_pending_snapshots,
+		.get_max_buffer_size = nvgpu_css_get_max_buffer_size,
 	},
 #endif
 	.xve = {

drivers/gpu/nvgpu/include/nvgpu/cyclestats_snapshot.h

@@ -162,4 +162,6 @@ int nvgpu_css_flush(struct channel_gk20a *ch,
 
 void nvgpu_free_cyclestats_snapshot_data(struct gk20a *g);
 
+u32 nvgpu_css_get_max_buffer_size(struct gk20a *g);
+
 #endif /* CYCLESTATS_SNAPSHOT_H */

drivers/gpu/nvgpu/include/nvgpu/gk20a.h

@@ -1646,6 +1646,7 @@ struct gpu_ops {
 				struct gk20a_cs_snapshot_client *client);
 		bool (*get_overflow_status)(struct gk20a *g);
 		u32 (*get_pending_snapshots)(struct gk20a *g);
+		u32 (*get_max_buffer_size)(struct gk20a *g);
 	} css;
 #endif
 	struct {

drivers/gpu/nvgpu/os/linux/ioctl_ctrl.c

@@ -336,7 +336,7 @@ gk20a_ctrl_ioctl_gpu_characteristics(
 	gpu.sm_arch_spa_version = g->params.sm_arch_spa_version;
 	gpu.sm_arch_warp_count = g->params.sm_arch_warp_count;
 
-	gpu.max_css_buffer_size = g->gr->max_css_buffer_size;
+	gpu.max_css_buffer_size = g->ops.css.get_max_buffer_size(g);;
 	gpu.max_ctxsw_ring_buffer_size = g->gr->max_ctxsw_ring_buffer_size;
 
 	gpu.gpu_ioctl_nr_last = NVGPU_GPU_IOCTL_LAST;