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gpu: nvgpu: Add timeouts_disabled_refcount for enabling timeout

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-timeouts will be enabled only when timeouts_disabled_refcount
 will reach 0
-timeouts_enabled debugfs will change from u32 type to file type
 to avoid race enabling/disabling timeout from debugfs and ioctl
-unify setting timeouts_enabled from debugfs and ioctl

Bug 1982434

Change-Id: I54bab778f1ae533872146dfb8d80deafd2a685c7
Signed-off-by: Seema Khowala <seemaj@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1588690
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Seema Khowala
2017-10-30 14:15:51 -07:00
committed by mobile promotions
parent ac687c95d3
commit 982fcfa737
7 changed files with 91 additions and 29 deletions
Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/gpu/nvgpu/common/linux/debug.c
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@@ -279,6 +279,59 @@ static int gk20a_railgating_debugfs_init(struct gk20a *g)
return 0;
}
static ssize_t timeouts_enabled_read(struct file *file,
char __user *user_buf, size_t count, loff_t *ppos)
{
char buf[3];
struct gk20a *g = file->private_data;
if (nvgpu_is_timeouts_enabled(g))
buf[0] = 'Y';
else
buf[0] = 'N';
buf[1] = '\n';
buf[2] = 0x00;
return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
}
static ssize_t timeouts_enabled_write(struct file *file,
const char __user *user_buf, size_t count, loff_t *ppos)
{
char buf[3];
int buf_size;
bool timeouts_enabled;
struct gk20a *g = file->private_data;
buf_size = min(count, (sizeof(buf)-1));
if (copy_from_user(buf, user_buf, buf_size))
return -EFAULT;
if (strtobool(buf, &timeouts_enabled) == 0) {
nvgpu_mutex_acquire(&g->dbg_sessions_lock);
if (timeouts_enabled == false) {
/* requesting to disable timeouts */
if (g->timeouts_disabled_by_user == false) {
nvgpu_atomic_inc(&g->timeouts_disabled_refcount);
g->timeouts_disabled_by_user = true;
}
} else {
/* requesting to enable timeouts */
if (g->timeouts_disabled_by_user == true) {
nvgpu_atomic_dec(&g->timeouts_disabled_refcount);
g->timeouts_disabled_by_user = false;
}
}
nvgpu_mutex_release(&g->dbg_sessions_lock);
}
return count;
}
static const struct file_operations timeouts_enabled_fops = {
.open = simple_open,
.read = timeouts_enabled_read,
.write = timeouts_enabled_write,
};
void gk20a_debug_init(struct gk20a *g, const char *debugfs_symlink)
{
@@ -323,10 +376,11 @@ void gk20a_debug_init(struct gk20a *g, const char *debugfs_symlink)
S_IRUGO|S_IWUSR, l->debugfs,
&g->gr_idle_timeout_default);
l->debugfs_timeouts_enabled =
debugfs_create_bool("timeouts_enabled",
debugfs_create_file("timeouts_enabled",
S_IRUGO|S_IWUSR,
l->debugfs,
&g->timeouts_enabled);
g,
&timeouts_enabled_fops);
l->debugfs_disable_bigpage =
debugfs_create_file("disable_bigpage",