gpu: nvgpu: Wait for pause for SMs

SM locking & register reads Order has been changed.
Also,  functions have been implemented based on gk20a
and gm20b.

Change-Id: Iaf720d088130f84c4b2ca318d9860194c07966e1
Signed-off-by: sujeet baranwal <sbaranwal@nvidia.com>
Signed-off-by: ashutosh jain <ashutoshj@nvidia.com>
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/837236

3 files changed, 69 insertions, 39 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c b/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
index 4f33c78f..e17e239b 100644
--- a/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/ctrl_gk20a.c
@@ -30,7 +30,6 @@
 #include "hw_fb_gk20a.h"
 #include "hw_proj_gk20a.h"
 
-
 int gk20a_ctrl_dev_open(struct inode *inode, struct file *filp)
 {
         struct gk20a *g;
@@ -389,64 +388,48 @@ static int nvgpu_gpu_ioctl_set_debug_mode(
         return err;
 }
 
-static int nvgpu_gpu_ioctl_wait_for_pause(
-                struct gk20a *g,
+static int nvgpu_gpu_ioctl_wait_for_pause(struct gk20a *g,
                 struct nvgpu_gpu_wait_pause_args *args)
 {
-        int err = 0, gpc, tpc;
-        u32 sm_count, sm_id, size;
+        int err = 0;
         struct warpstate *w_state;
         struct gr_gk20a *gr = &g->gr;
-        u32  tpc_offset, gpc_offset, reg_offset, global_mask;
-        u64 warps_valid = 0, warps_paused = 0, warps_trapped = 0;
+        u32 gpc, tpc, sm_count, sm_id, size;
+        u32 global_mask;
 
         sm_count = g->gr.gpc_count * g->gr.tpc_count;
         size = sm_count * sizeof(struct warpstate);
         w_state = kzalloc(size, GFP_KERNEL);
 
+    /* Wait for the SMs to reach full stop. This condition is:
+     * 1) All SMs with valid warps must be in the trap handler (SM_IN_TRAP_MODE)
+     * 2) All SMs in the trap handler must have equivalent VALID and PAUSED warp
+     *    masks.
+     */
         global_mask = gr_gpc0_tpc0_sm_hww_global_esr_bpt_int_pending_f()   |
                           gr_gpc0_tpc0_sm_hww_global_esr_bpt_pause_pending_f() |
                           gr_gpc0_tpc0_sm_hww_global_esr_single_step_complete_pending_f();
 
         mutex_lock(&g->dbg_sessions_lock);
 
+        /* Lock down all SMs */
         for (sm_id = 0; sm_id < gr->no_of_sm; sm_id++) {
 
                 gpc = g->gr.sm_to_cluster[sm_id].gpc_index;
                 tpc = g->gr.sm_to_cluster[sm_id].tpc_index;
 
-                tpc_offset = proj_tpc_in_gpc_stride_v() * tpc;
-                gpc_offset = proj_gpc_stride_v() * gpc;
-                reg_offset = tpc_offset + gpc_offset;
-
-                /* Wait until all valid warps on the sm are paused. The valid warp mask
-                 * must be re-read with the paused mask because new warps may become
-                 * valid as the sm is pausing.
-                 */
-
                 err = gk20a_gr_lock_down_sm(g, gpc, tpc, global_mask);
+
                 if (err) {
                         gk20a_err(dev_from_gk20a(g), "sm did not lock down!\n");
                         goto end;
                 }
-
-                /* 64 bit read */
-                warps_valid = (u64)gk20a_readl(g, gr_gpc0_tpc0_sm_warp_valid_mask_r() + reg_offset + 4) << 32;
-                warps_valid |= gk20a_readl(g, gr_gpc0_tpc0_sm_warp_valid_mask_r() + reg_offset);
-
-                /* 64 bit read */
-                warps_paused = (u64)gk20a_readl(g, gr_gpc0_tpc0_sm_dbgr_bpt_pause_mask_r() + reg_offset + 4) << 32;
-                warps_paused |= gk20a_readl(g, gr_gpc0_tpc0_sm_dbgr_bpt_pause_mask_r() + reg_offset);
-
-                /* 64 bit read */
-                warps_trapped = (u64)gk20a_readl(g, gr_gpc0_tpc0_sm_dbgr_bpt_trap_mask_r() + reg_offset + 4) << 32;
-                warps_trapped |= gk20a_readl(g, gr_gpc0_tpc0_sm_dbgr_bpt_trap_mask_r() + reg_offset);
-
-                w_state[sm_id].valid_warps = warps_valid;
-                w_state[sm_id].trapped_warps = warps_trapped;
-                w_state[sm_id].paused_warps = warps_paused;
         }
 
+        /* Read the warp status */
+        g->ops.gr.bpt_reg_info(g, w_state);
+
+        /* Copy to user space - pointed by "args->pwarpstate" */
         if (copy_to_user((void __user *)(uintptr_t)args->pwarpstate, w_state, size)) {
                 gk20a_dbg_fn("copy_to_user failed!");
                 err = -EFAULT;
diff --git a/drivers/gpu/nvgpu/gk20a/gk20a.h b/drivers/gpu/nvgpu/gk20a/gk20a.h
index 51955a3a..47256e24 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a.h
+++ b/drivers/gpu/nvgpu/gk20a/gk20a.h
@@ -185,6 +185,8 @@ struct gpu_ops {
                        u32 expect_delay);
                 void (*init_cyclestats)(struct gk20a *g);
                 void (*enable_cde_in_fecs)(void *ctx_ptr);
+                void (*bpt_reg_info)(struct gk20a *g,
+                                struct warpstate *w_state);
         } gr;
         const char *name;
         struct {
diff --git a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
index 090f95a5..ef24e078 100644
--- a/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/gr_gk20a.c
@@ -6973,8 +6973,8 @@ static u32 gr_gk20a_get_tpc_num(u32 addr)
 static int gk20a_gr_wait_for_sm_lock_down(struct gk20a *g, u32 gpc, u32 tpc,
                 u32 global_esr_mask, bool check_errors)
 {
-        unsigned long end_jiffies = jiffies +
-                msecs_to_jiffies(gk20a_get_gr_idle_timeout(g));
+        bool locked_down;
+        bool no_error_pending;
         u32 delay = GR_IDLE_CHECK_DEFAULT;
         bool mmu_debug_mode_enabled = g->ops.mm.is_debug_mode_enabled(g);
         u32 offset =
@@ -6991,10 +6991,10 @@ static int gk20a_gr_wait_for_sm_lock_down(struct gk20a *g, u32 gpc, u32 tpc,
                                 gr_gpc0_tpc0_sm_hww_warp_esr_r() + offset);
                 u32 dbgr_status0 = gk20a_readl(g,
                                 gr_gpc0_tpc0_sm_dbgr_status0_r() + offset);
-                bool locked_down =
+                locked_down =
                     (gr_gpc0_tpc0_sm_dbgr_status0_locked_down_v(dbgr_status0) ==
                      gr_gpc0_tpc0_sm_dbgr_status0_locked_down_true_v());
-                bool no_error_pending =
+                no_error_pending =
                         check_errors &&
                         (gr_gpc0_tpc0_sm_hww_warp_esr_error_v(warp_esr) ==
                          gr_gpc0_tpc0_sm_hww_warp_esr_error_none_v()) &&
@@ -7018,9 +7018,7 @@ static int gk20a_gr_wait_for_sm_lock_down(struct gk20a *g, u32 gpc, u32 tpc,
 
                 usleep_range(delay, delay * 2);
                 delay = min_t(u32, delay << 1, GR_IDLE_CHECK_MAX);
-
-        } while (time_before(jiffies, end_jiffies)
-                        || !tegra_platform_is_silicon());
+        } while (!locked_down);
 
         gk20a_err(dev_from_gk20a(g),
                   "GPC%d TPC%d: timed out while trying to lock down SM",
@@ -7273,6 +7271,52 @@ static void gr_gk20a_init_cyclestats(struct gk20a *g)
 #endif
 }
 
+void gr_gk20a_bpt_reg_info(struct gk20a *g, struct warpstate *w_state)
+{
+        /* Check if we have at least one valid warp */
+        struct gr_gk20a *gr = &g->gr;
+        u32 gpc, tpc, sm_id;
+        u32  tpc_offset, gpc_offset, reg_offset;
+        u64 warps_valid = 0, warps_paused = 0, warps_trapped = 0;
+
+        for (sm_id = 0; sm_id < gr->no_of_sm; sm_id++) {
+                gpc = g->gr.sm_to_cluster[sm_id].gpc_index;
+                tpc = g->gr.sm_to_cluster[sm_id].tpc_index;
+
+                tpc_offset = proj_tpc_in_gpc_stride_v() * tpc;
+                gpc_offset = proj_gpc_stride_v() * gpc;
+                reg_offset = tpc_offset + gpc_offset;
+
+                /* 64 bit read */
+                warps_valid = (u64)gk20a_readl(g, gr_gpc0_tpc0_sm_warp_valid_mask_r() + reg_offset + 4) << 32;
+                warps_valid |= gk20a_readl(g, gr_gpc0_tpc0_sm_warp_valid_mask_r() + reg_offset);
+
+
+                /* 64 bit read */
+                warps_paused = (u64)gk20a_readl(g, gr_gpc0_tpc0_sm_dbgr_bpt_pause_mask_r() + reg_offset + 4) << 32;
+                warps_paused |= gk20a_readl(g, gr_gpc0_tpc0_sm_dbgr_bpt_pause_mask_r() + reg_offset);
+
+                /* 64 bit read */
+                warps_trapped = (u64)gk20a_readl(g, gr_gpc0_tpc0_sm_dbgr_bpt_trap_mask_r() + reg_offset + 4) << 32;
+                warps_trapped |= gk20a_readl(g, gr_gpc0_tpc0_sm_dbgr_bpt_trap_mask_r() + reg_offset);
+
+                w_state[sm_id].valid_warps[0] = warps_valid;
+                w_state[sm_id].trapped_warps[0] = warps_trapped;
+                w_state[sm_id].paused_warps[0] = warps_paused;
+        }
+
+        /* Only for debug purpose */
+        for (sm_id = 0; sm_id < gr->no_of_sm; sm_id++) {
+                gk20a_dbg_fn("w_state[%d].valid_warps[0]: %llx\n",
+                                                sm_id, w_state[sm_id].valid_warps[0]);
+                gk20a_dbg_fn("w_state[%d].trapped_warps[0]: %llx\n",
+                                                sm_id, w_state[sm_id].trapped_warps[0]);
+                gk20a_dbg_fn("w_state[%d].paused_warps[0]:  %llx\n",
+                                                sm_id, w_state[sm_id].paused_warps[0]);
+        }
+}
+
+
 void gk20a_init_gr_ops(struct gpu_ops *gops)
 {
         gops->gr.access_smpc_reg = gr_gk20a_access_smpc_reg;
@@ -7324,4 +7368,5 @@ void gk20a_init_gr_ops(struct gpu_ops *gops)
         gops->gr.init_sm_dsm_reg_info = gr_gk20a_init_sm_dsm_reg_info;
         gops->gr.wait_empty = gr_gk20a_wait_idle;
         gops->gr.init_cyclestats = gr_gk20a_init_cyclestats;
+        gops->gr.bpt_reg_info = gr_gk20a_bpt_reg_info;
 }