gpu: nvgpu: Dynamic betacb size

Allow querying and setting default betacb size via debugfs. For global buffers
the value takes effect upon first boot of GPU, and has no effect after that.

Bug 1628352

Change-Id: Ib63f4299249c41eab1b36cc501b525cc54211195
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/733328

5 files changed, 23 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.c b/drivers/gpu/nvgpu/gk20a/gk20a.c
index b8357c76..470729b7 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.c
@@ -1518,6 +1518,7 @@ static int gk20a_probe(struct platform_device *dev)
                                         S_IRUGO|S_IWUSR,
                                         platform->debugfs,
                                         &gk20a->mm.disable_bigpage);
+        gr_gk20a_debugfs_init(gk20a);
         gk20a_pmu_debugfs_init(dev);
         gk20a_cde_debugfs_init(dev);
 #endif
diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index c310d73c..ce8d1d62 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -472,6 +472,7 @@ struct gk20a {
         struct dentry *debugfs_gr_idle_timeout_default;
         struct dentry *debugfs_bypass_smmu;
         struct dentry *debugfs_disable_bigpage;
+        struct dentry *debugfs_gr_default_attrib_cb_size;
 #endif
         struct gk20a_ctxsw_ucode_info ctxsw_ucode_info;
 
diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
index d0c5da0e..78f81513 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
@@ -21,6 +21,7 @@
 #include <linux/mm.h>           /* for totalram_pages */
 #include <linux/scatterlist.h>
 #include <linux/tegra-soc.h>
+#include <linux/debugfs.h>
 #include <uapi/linux/nvgpu.h>
 #include <linux/vmalloc.h>
 #include <linux/dma-mapping.h>
@@ -54,6 +55,7 @@
 #include "dbg_gpu_gk20a.h"
 #include "debug_gk20a.h"
 #include "semaphore_gk20a.h"
+#include "platform_gk20a.h"
 
 #define BLK_SIZE (256)
 
@@ -6909,8 +6911,9 @@ static void gr_gk20a_cb_size_default(struct gk20a *g)
 {
         struct gr_gk20a *gr = &g->gr;
 
-        gr->attrib_cb_default_size =
-                gr_gpc0_ppc0_cbm_cfg_size_default_v();
+        if (!gr->attrib_cb_default_size)
+                gr->attrib_cb_default_size =
+                        gr_gpc0_ppc0_cbm_cfg_size_default_v();
         gr->alpha_cb_default_size =
                 gr_gpc0_ppc0_cbm_cfg2_size_default_v();
 }
@@ -7267,6 +7270,18 @@ static int gr_gk20a_dump_gr_status_regs(struct gk20a *g,
         return 0;
 }
 
+int gr_gk20a_debugfs_init(struct gk20a *g)
+{
+        struct gk20a_platform *platform = platform_get_drvdata(g->dev);
+
+        g->debugfs_gr_default_attrib_cb_size =
+                debugfs_create_u32("gr_default_attrib_cb_size",
+                                   S_IRUGO|S_IWUSR, platform->debugfs,
+                                   &g->gr.attrib_cb_default_size);
+
+        return 0;
+}
+
 void gk20a_init_gr_ops(struct gpu_ops *gops)
 {
         gops->gr.access_smpc_reg = gr_gk20a_access_smpc_reg;
diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.h b/drivers/gpu/nvgpu/gk20a/gr_gk20a.h
index 1a55e064..b2213739 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.h
@@ -495,5 +495,6 @@ int gr_gk20a_alloc_gr_ctx(struct gk20a *g,
 void gr_gk20a_free_gr_ctx(struct gk20a *g,
                           struct vm_gk20a *vm, struct gr_ctx_desc *gr_ctx);
 int gr_gk20a_halt_pipe(struct gk20a *g);
+int gr_gk20a_debugfs_init(struct gk20a *g);
 
 #endif /*__GR_GK20A_H__*/
diff --git a/drivers/gpu/nvgpu/gm20b/gr_gm20b.c b/drivers/gpu/nvgpu/gm20b/gr_gm20b.c
index 74761258..55a21c98 100644
--- a/drivers/gpu/nvgpu/gm20b/gr_gm20b.c
+++ b/drivers/gpu/nvgpu/gm20b/gr_gm20b.c
@@ -85,8 +85,9 @@ static void gr_gm20b_cb_size_default(struct gk20a *g)
 {
         struct gr_gk20a *gr = &g->gr;
 
-        gr->attrib_cb_default_size =
-                gr_gpc0_ppc0_cbm_beta_cb_size_v_default_v();
+        if (!gr->attrib_cb_default_size)
+                gr->attrib_cb_default_size =
+                        gr_gpc0_ppc0_cbm_beta_cb_size_v_default_v();
         gr->alpha_cb_default_size =
                 gr_gpc0_ppc0_cbm_alpha_cb_size_v_default_v();
 }