gpu: nvgpu: Debugfs for S_param

Changes:
1) Added nvgpu_s_param_init_debugfs for creating debugfs interface.
2) Command for S_param value:
   cat /sys/kernel/debug/gpu_pci/s_param
3) vfe_var_boardobj_grp_get_status is implemented.

Jira NVGPU-1736

Change-Id: Icbcf39e47777fe969ae2592b58a3103a21011a87
Signed-off-by: rmylavarapu <rmylavarapu@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1989334
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

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

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2019, 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,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/debugfs.h>
+#include "os_linux.h"
+#include "include/nvgpu/bios.h"
+
+#include <common/pmu/perf/vfe_var.h>
+#include <nvgpu/pmu/perf.h>
+
+static int get_s_param_info(void *data, u64 *val)
+{
+	struct gk20a *g = (struct gk20a *)data;
+	struct boardobjgrp *pboardobjgrp;
+	struct boardobj *pboardobj = NULL;
+	struct vfe_var_single_sensed_fuse *single_sensed_fuse = NULL;
+	int status;
+	u8 index;
+
+	status = nvgpu_vfe_var_boardobj_grp_get_status(g);
+	if(status != 0) {
+		nvgpu_err(g, "Vfe_var get status failed");
+		return status;
+	}
+
+	pboardobjgrp = &g->perf_pmu->vfe_varobjs.super.super;
+
+	BOARDOBJGRP_FOR_EACH(pboardobjgrp, struct boardobj*, pboardobj, index) {
+		single_sensed_fuse = (struct vfe_var_single_sensed_fuse *)
+				(void *)pboardobj;
+		if(single_sensed_fuse->vfield_info.v_field_id ==
+				VFIELD_ID_S_PARAM) {
+			*val = single_sensed_fuse->fuse_value_hw_integer;
+		}
+	}
+	return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(s_param_fops, get_s_param_info , NULL, "%llu\n");
+
+int nvgpu_s_param_init_debugfs(struct gk20a *g)
+{
+	struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+	struct dentry *dbgentry;
+
+	dbgentry = debugfs_create_file(
+		"s_param", S_IRUGO, l->debugfs, g, &s_param_fops);
+	if (!dbgentry) {
+		pr_err("%s: Failed to make debugfs node\n", __func__);
+		return -ENOMEM;
+	}
+
+	return 0;
+}

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

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2019, 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,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __DEBUG_S_PARAM_TU104_H
+#define __DEBUG_S_PARAM_TU104_H
+
+#include <nvgpu/gk20a.h>
+
+#ifdef CONFIG_DEBUG_FS
+int nvgpu_s_param_init_debugfs(struct gk20a *g);
+#else
+static inline int nvgpu_s_param_init_debugfs(struct gk20a *g)
+{
+	return 0;
+}
+#endif
+
+#endif

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

@@ -241,6 +241,14 @@ int nvgpu_finalize_poweron_linux(struct nvgpu_os_linux *l)
 		}
 	}
 
+	if (l->ops.s_param.init_debugfs) {
+		err = l->ops.s_param.init_debugfs(g);
+		if (err) {
+			nvgpu_err(g, "failed to init linux s_param trace debugfs");
+			return err;
+		}
+	}
+
 	err = nvgpu_pmgr_init_debugfs_linux(l);
 	if (err) {
 		nvgpu_err(g, "failed to init linux pmgr debugfs");

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

@@ -56,6 +56,10 @@ struct nvgpu_os_linux_ops {
 	struct {
 		int (*init_debugfs)(struct gk20a *g);
 	} volt;
+
+	struct {
+		int (*init_debugfs)(struct gk20a *g);
+	} s_param;
 };
 
 struct nvgpu_os_linux {

drivers/gpu/nvgpu/os/linux/os_ops_tu104.c

@@ -19,6 +19,7 @@
 #include "os/linux/debug_therm_gp106.h"
 #include "os/linux/debug_clk_gv100.h"
 #include "os/linux/debug_volt.h"
+#include "os/linux/debug_s_param.h"
 
 static struct nvgpu_os_linux_ops tu104_os_linux_ops = {
 	.therm = {
@@ -30,6 +31,9 @@ static struct nvgpu_os_linux_ops tu104_os_linux_ops = {
 	.volt = {
 		.init_debugfs = nvgpu_volt_init_debugfs,
 	},
+	.s_param = {
+		.init_debugfs = nvgpu_s_param_init_debugfs,
+	},
 };
 
 void nvgpu_tu104_init_os_ops(struct nvgpu_os_linux *l)
@@ -37,4 +41,5 @@ void nvgpu_tu104_init_os_ops(struct nvgpu_os_linux *l)
 	l->ops.therm = tu104_os_linux_ops.therm;
 	l->ops.clk = tu104_os_linux_ops.clk;
 	l->ops.volt = tu104_os_linux_ops.volt;
+	l->ops.s_param = tu104_os_linux_ops.s_param;
 }