gpu: nvgpu: Use TPC_PG_MASK to powergate the TPC

- In GV11B, read fuse_status_opt_tpc_gpc register
  to read which TPCs are floorswept.
- The driver will also read sysfs node: tpc_pg_mask
- Based on these two values "can_tpc_powergate" will
  be set to true or false and mask will be used to write to
  fuse_ctrl_opt_tpc_gpc register to powergate the TPC.
- can_tpc_powergate = true indicates that the mask value
  sent from userspace is valid and can be used to power gate
  the desired TPC
- can_tpc_powergate = false indicates that the mask value
  sent from userspace is not valid and cannot  be used to
  power gate the desired TPC.

Bug 200532639

Change-Id: Ib0806e4c96305a13b3574e8063ad8e16770aa7cd
Signed-off-by: Divya Singhatwaria <dsinghatwari@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/2159219
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 14 insertions, 14 deletions

diff --git a/drivers/gpu/nvgpu/os/linux/sysfs.c b/drivers/gpu/nvgpu/os/linux/sysfs.c
index 759c12e8..2ab29649 100644
--- a/drivers/gpu/nvgpu/os/linux/sysfs.c
+++ b/drivers/gpu/nvgpu/os/linux/sysfs.c
@@ -788,26 +788,28 @@ static ssize_t force_idle_read(struct device *dev,
 static DEVICE_ATTR(force_idle, ROOTRW, force_idle_read, force_idle_store);
 #endif
 
-static ssize_t tpc_pg_mask_read(struct device *dev,
-        struct device_attribute *attr, char *buf)
-{
-        struct gk20a *g = get_gk20a(dev);
-
-        return snprintf(buf, PAGE_SIZE, "%d\n", g->tpc_pg_mask);
-}
-
 static bool is_tpc_mask_valid(struct gk20a *g, u32 tpc_mask)
 {
         u32 i;
         bool valid = false;
 
         for (i = 0; i < MAX_TPC_PG_CONFIGS; i++) {
-                if (tpc_mask == g->valid_tpc_mask[i])
+                if (tpc_mask == g->valid_tpc_mask[i]) {
                         valid = true;
+                        break;
+                }
         }
         return valid;
 }
 
+static ssize_t tpc_pg_mask_read(struct device *dev,
+        struct device_attribute *attr, char *buf)
+{
+        struct gk20a *g = get_gk20a(dev);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", g->tpc_pg_mask);
+}
+
 static ssize_t tpc_pg_mask_store(struct device *dev,
         struct device_attribute *attr, const char *buf, size_t count)
 {
@@ -817,11 +819,6 @@ static ssize_t tpc_pg_mask_store(struct device *dev,
 
         nvgpu_mutex_acquire(&g->tpc_pg_lock);
 
-        if (!g->can_tpc_powergate) {
-                nvgpu_info(g, "TPC-PG not enabled for the platform");
-                goto exit;
-        }
-
         if (kstrtoul(buf, 10, &val) < 0) {
                 nvgpu_err(g, "invalid value");
                 nvgpu_mutex_release(&g->tpc_pg_lock);
@@ -839,6 +836,9 @@ static ssize_t tpc_pg_mask_store(struct device *dev,
                 return -ENODEV;
         }
 
+        /* checking that the value from userspace is within
+         * the  possible valid TPC configurations.
+         */
         if (is_tpc_mask_valid(g, (u32)val)) {
                 g->tpc_pg_mask = val;
         } else {