gpu: nvgpu: unify nvgpu_has_syncpoints

- move nvgpu_has_syncpoints to common code and only checks flag
NVGPU_HAS_SYNCPOINTS
- the debugfs node disable_syncpoints also enable/disable the flag
NVGPU_HAS_SYNCPOINTS

Jira GVSCI-10881

Signed-off-by: Richard Zhao <rizhao@nvidia.com>
Change-Id: I8dc5dd17ad404238203a048abf49ff2b434fce11
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2542738
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Sachin Nikam <snikam@nvidia.com>
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

drivers/gpu/nvgpu/include/nvgpu/nvhost.h

@@ -24,6 +24,7 @@
 #define NVGPU_NVHOST_H
 
 #include <nvgpu/types.h>
+#include <nvgpu/enabled.h>
 
 struct gk20a;
 #define NVGPU_INVALID_SYNCPT_ID	(~U32(0U))
@@ -87,7 +88,10 @@ void nvgpu_free_nvhost_dev(struct gk20a *g);
  * @retval		TRUE For syncpoint support.
  *
  */
-bool nvgpu_has_syncpoints(struct gk20a *g);
+static inline bool nvgpu_has_syncpoints(struct gk20a *g)
+{
+	return nvgpu_is_enabled(g, NVGPU_HAS_SYNCPOINTS);
+}
 
 #ifdef CONFIG_NVGPU_KERNEL_MODE_SUBMIT
 /**

drivers/gpu/nvgpu/os/linux/debug.c

@@ -384,6 +384,48 @@ static const struct file_operations dbg_tsg_timeslice_max_fops = {
 		.write =        dbg_tsg_timeslice_max_write,
 };
 
+static ssize_t disable_syncpts_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_enabled(g, NVGPU_HAS_SYNCPOINTS))
+		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 disable_syncpts_write(struct file *file,
+			const char __user *user_buf, size_t count, loff_t *ppos)
+{
+	char buf[3];
+	int buf_size;
+	bool disable_syncpts;
+	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 (!g->nvhost)
+		return -ENOSYS;
+
+	if (strtobool(buf, &disable_syncpts) == 0)
+		nvgpu_set_enabled(g, NVGPU_HAS_SYNCPOINTS, !disable_syncpts);
+
+	return count;
+}
+
+static const struct file_operations disable_syncpts_fops = {
+	.open =		simple_open,
+	.read =		disable_syncpts_read,
+	.write =	disable_syncpts_write,
+};
+
 void gk20a_debug_init(struct gk20a *g, const char *debugfs_symlink)
 {
 	struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
@@ -408,8 +450,13 @@ void gk20a_debug_init(struct gk20a *g, const char *debugfs_symlink)
 	debugfs_create_u32("ch_wdt_init_limit_ms", S_IRUGO|S_IWUSR,
 		l->debugfs, &g->ch_wdt_init_limit_ms);
 
-	debugfs_create_bool("disable_syncpoints", S_IRUGO|S_IWUSR,
-		l->debugfs, &l->disable_syncpoints);
+	l->debugfs_disable_syncpts =
+			debugfs_create_file("disable_syncpoints",
+					S_IRUGO|S_IWUSR,
+					l->debugfs,
+					g,
+					&disable_syncpts_fops);
+
 	debugfs_create_bool("enable_platform_dbg", S_IRUGO|S_IWUSR,
 		l->debugfs, &l->enable_platform_dbg);
 

drivers/gpu/nvgpu/os/linux/nvhost_common.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2017-2020, NVIDIA CORPORATION.  All rights reserved.
+ * Copyright (c) 2017-2021, NVIDIA CORPORATION.  All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -41,14 +41,6 @@ void nvgpu_free_nvhost_dev(struct gk20a *g)
 	nvgpu_kfree(g, g->nvhost);
 }
 
-bool nvgpu_has_syncpoints(struct gk20a *g)
-{
-	struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
-
-	return nvgpu_is_enabled(g, NVGPU_HAS_SYNCPOINTS) &&
-		!l->disable_syncpoints;
-}
-
 int nvgpu_nvhost_create_symlink(struct gk20a *g)
 {
 	struct device *dev = dev_from_gk20a(g);

drivers/gpu/nvgpu/os/linux/os_linux.h

@@ -114,6 +114,7 @@ struct nvgpu_os_linux {
 	struct dentry *debugfs_timeouts_enabled;
 	struct dentry *debugfs_disable_bigpage;
 	struct dentry *debugfs_dbg_tsg_timeslice_max_us;
+	struct dentry *debugfs_disable_syncpts;
 
 	struct dentry *debugfs_runlist_interleave;
 	struct dentry *debugfs_allocators;
@@ -135,8 +136,6 @@ struct nvgpu_os_linux {
 
 	bool init_done;
 
-	/** Debugfs knob for forcing syncpt support off in runtime. */
-	bool disable_syncpoints;
 	bool enable_platform_dbg;
 };
 

libs/dgpu/libnvgpu-drv-dgpu_safe.export

@@ -497,7 +497,6 @@ nvgpu_gr_subctx_alloc
 nvgpu_gr_subctx_free
 nvgpu_gr_suspend
 nvgpu_gr_sw_ready
-nvgpu_has_syncpoints
 nvgpu_init_enabled_flags
 nvgpu_init_errata_flags
 nvgpu_init_hal

libs/igpu/libnvgpu-drv-igpu_safe.export

@@ -513,7 +513,6 @@ nvgpu_gr_subctx_alloc
 nvgpu_gr_subctx_free
 nvgpu_gr_suspend
 nvgpu_gr_sw_ready
-nvgpu_has_syncpoints
 nvgpu_init_enabled_flags
 nvgpu_init_errata_flags
 nvgpu_init_fb_support