gpu: nvgpu: Add proper timeout handling for vidmem clear operations

gk20a_fence_wait() api may be interrupted by a signal before actual
its timeout elapsed. This CL does retry (-ERESTARTSYS) mechanism
if gk20a_fence_wait() return before its timeout elapsed.

Bug 200230544

Change-Id: I347ed2004935a8b9413f95dcb6fca2b74bf49f2a
Signed-off-by: Lakshmanan M <lm@nvidia.com>
Reviewed-on: http://git-master/r/1206265
(cherry picked from commit d3ef533942487785d84d109f985ae648eb3c2434)
Reviewed-on: http://git-master/r/1210955
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

1 files changed, 18 insertions, 4 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
index 179e6fc1..4872bb95 100644
--- a/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/mm_gk20a.c
@@ -831,8 +831,15 @@ static int gk20a_vidmem_clear_all(struct gk20a *g)
         }
 
         if (gk20a_fence_out) {
-                err = gk20a_fence_wait(gk20a_fence_out,
-                                gk20a_get_gr_idle_timeout(g));
+                unsigned long end_jiffies = jiffies +
+                        msecs_to_jiffies(gk20a_get_gr_idle_timeout(g));
+
+                do {
+                        unsigned int timeout = jiffies_to_msecs(end_jiffies - jiffies);
+                        err = gk20a_fence_wait(gk20a_fence_out,
+                                        timeout);
+                } while ((err == -ERESTARTSYS) && time_before(jiffies, end_jiffies));
+
                 gk20a_fence_put(gk20a_fence_out);
                 if (err) {
                         gk20a_err(g->dev,
@@ -2880,8 +2887,15 @@ static int gk20a_gmmu_clear_vidmem_mem(struct gk20a *g, struct mem_desc *mem)
         }
 
         if (gk20a_last_fence) {
-                err = gk20a_fence_wait(gk20a_last_fence,
-                                gk20a_get_gr_idle_timeout(g));
+                unsigned long end_jiffies = jiffies +
+                        msecs_to_jiffies(gk20a_get_gr_idle_timeout(g));
+
+                do {
+                        unsigned int timeout = jiffies_to_msecs(end_jiffies - jiffies);
+                        err = gk20a_fence_wait(gk20a_last_fence,
+                                        timeout);
+                } while ((err == -ERESTARTSYS) && time_before(jiffies, end_jiffies));
+
                 gk20a_fence_put(gk20a_last_fence);
                 if (err)
                         gk20a_err(g->dev,