gpu: nvgpu:Add sysfs node for GV100 clocks

Creates sysfs nodes to read clk freq on GV100
Following sysfs nodes are created: gpcclk,xbarclk,sysclk
Uses default clock source and counters for measurement

Bug 200446261

Change-Id: I6903ba77fbe34e3f486f4b663e70eab4e7c5d662
Signed-off-by: absalam <absalam@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1828030
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

9 files changed, 540 insertions, 12 deletions

diff --git a/drivers/gpu/nvgpu/Makefile b/drivers/gpu/nvgpu/Makefile
index d7944088..d704de83 100644
--- a/drivers/gpu/nvgpu/Makefile
+++ b/drivers/gpu/nvgpu/Makefile
@@ -113,7 +113,8 @@ nvgpu-$(CONFIG_DEBUG_FS) += \
         os/linux/debug_therm_gp106.o \
         os/linux/debug_bios.o \
         os/linux/debug_ltc.o \
-        os/linux/debug_xve.o
+        os/linux/debug_xve.o \
+        os/linux/debug_clk_gv100.o
 
 ifeq ($(CONFIG_NVGPU_TRACK_MEM_USAGE),y)
 nvgpu-$(CONFIG_DEBUG_FS) += \
@@ -363,4 +364,5 @@ nvgpu-y += \
         therm/thrmchannel.o \
         therm/thrmpmu.o \
         lpwr/rppg.o \
-        lpwr/lpwr.o
+        lpwr/lpwr.o \
+        gv100/clk_gv100.o
diff --git a/drivers/gpu/nvgpu/Makefile.sources b/drivers/gpu/nvgpu/Makefile.sources
index a5325980..cc612e07 100644
--- a/drivers/gpu/nvgpu/Makefile.sources
+++ b/drivers/gpu/nvgpu/Makefile.sources
@@ -217,4 +217,5 @@ srcs :=	os/posix/nvgpu.c \
         gv100/hal_gv100.c \
         gv100/pmu_gv100.c \
         gv100/perf_gv100.c \
-        gv100/gsp_gv100.c
+        gv100/gsp_gv100.c \
+        gv100/clk_gv100.c
diff --git a/drivers/gpu/nvgpu/gv100/clk_gv100.c b/drivers/gpu/nvgpu/gv100/clk_gv100.c
new file mode 100644
index 00000000..7855aa41
--- /dev/null
+++ b/drivers/gpu/nvgpu/gv100/clk_gv100.c
@@ -0,0 +1,193 @@
+/*
+ * GV100 Clocks
+ *
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/debugfs.h>
+#include "os/linux/os_linux.h"
+#endif
+
+#include <nvgpu/kmem.h>
+#include <nvgpu/io.h>
+#include <nvgpu/list.h>
+#include <nvgpu/clk_arb.h>
+#include <nvgpu/timers.h>
+
+#include "gk20a/gk20a.h"
+
+#include "clk_gv100.h"
+
+#include <nvgpu/hw/gv100/hw_trim_gv100.h>
+
+
+u32 gv100_crystal_clk_hz(struct gk20a *g)
+{
+        return (XTAL4X_KHZ * 1000);
+}
+
+unsigned long gv100_clk_measure_freq(struct gk20a *g, u32 api_domain)
+{
+        struct clk_gk20a *clk = &g->clk;
+        u32 freq_khz;
+        u32 i;
+        struct namemap_cfg *c = NULL;
+
+        for (i = 0; i < clk->namemap_num; i++) {
+                if (api_domain == clk->namemap_xlat_table[i]) {
+                        c = &clk->clk_namemap[i];
+                        break;
+                }
+        }
+
+        if (c == NULL) {
+                return 0;
+        }
+        if (c->is_counter != 0U) {
+                freq_khz = c->scale * gv100_get_rate_cntr(g, c);
+        } else {
+                freq_khz = 0U;
+                 /* TODO: PLL read */
+        }
+
+        /* Convert to HZ */
+        return freq_khz * 1000UL;
+}
+
+int gv100_init_clk_support(struct gk20a *g)
+{
+        struct clk_gk20a *clk = &g->clk;
+        int err = 0;
+
+        nvgpu_log_fn(g, " ");
+
+        err = nvgpu_mutex_init(&clk->clk_mutex);
+        if (err != 0) {
+                return err;
+        }
+
+        clk->clk_namemap = (struct namemap_cfg *)
+                nvgpu_kzalloc(g, sizeof(struct namemap_cfg) * NUM_NAMEMAPS);
+
+        if (clk->clk_namemap == NULL) {
+                nvgpu_mutex_destroy(&clk->clk_mutex);
+                return -ENOMEM;
+        }
+
+        clk->namemap_xlat_table = nvgpu_kcalloc(g, NUM_NAMEMAPS, sizeof(u32));
+
+        if (clk->namemap_xlat_table == NULL) {
+                nvgpu_kfree(g, clk->clk_namemap);
+                nvgpu_mutex_destroy(&clk->clk_mutex);
+                return -ENOMEM;
+        }
+
+        clk->clk_namemap[0] = (struct namemap_cfg) {
+                .namemap = CLK_NAMEMAP_INDEX_GPCCLK,
+                .is_enable = 1,
+                .is_counter = 1,
+                .g = g,
+                .cntr = {
+                        .reg_ctrl_addr = trim_gpc_bcast_fr_clk_cntr_ncgpcclk_cfg_r(),
+                        .reg_ctrl_idx  = trim_gpc_bcast_fr_clk_cntr_ncgpcclk_cfg_source_gpcclk_f(),
+                        .reg_cntr_addr[0] = trim_gpc_bcast_fr_clk_cntr_ncgpcclk_cnt0_r(),
+                        .reg_cntr_addr[1] = trim_gpc_bcast_fr_clk_cntr_ncgpcclk_cnt1_r()
+                },
+                .name = "gpcclk",
+                .scale = 1
+        };
+        clk->namemap_xlat_table[0] = CTRL_CLK_DOMAIN_GPCCLK;
+
+        clk->clk_namemap[1] = (struct namemap_cfg) {
+                .namemap = CLK_NAMEMAP_INDEX_SYSCLK,
+                .is_enable = 1,
+                .is_counter = 1,
+                .g = g,
+                .cntr = {
+                        .reg_ctrl_addr = trim_sys_fr_clk_cntr_sysclk_cfg_r(),
+                        .reg_ctrl_idx  = trim_sys_fr_clk_cntr_sysclk_cfg_source_sysclk_f(),
+                        .reg_cntr_addr[0] = trim_sys_fr_clk_cntr_sysclk_cntr0_r(),
+                        .reg_cntr_addr[1] = trim_sys_fr_clk_cntr_sysclk_cntr1_r()
+                },
+                .name = "sysclk",
+                .scale = 1
+        };
+        clk->namemap_xlat_table[1] = CTRL_CLK_DOMAIN_SYSCLK;
+
+        clk->clk_namemap[2] = (struct namemap_cfg) {
+                .namemap = CLK_NAMEMAP_INDEX_XBARCLK,
+                .is_enable = 1,
+                .is_counter = 1,
+                .g = g,
+                .cntr = {
+                        .reg_ctrl_addr = trim_sys_nafll_fr_clk_cntr_xbarclk_cfg_r(),
+                        .reg_ctrl_idx  = trim_sys_nafll_fr_clk_cntr_xbarclk_cfg_source_xbarclk_f(),
+                        .reg_cntr_addr[0] = trim_sys_nafll_fr_clk_cntr_xbarclk_cntr0_r(),
+                        .reg_cntr_addr[1] = trim_sys_nafll_fr_clk_cntr_xbarclk_cntr1_r()
+                },
+                .name = "xbarclk",
+                .scale = 1
+        };
+        clk->namemap_xlat_table[2] = CTRL_CLK_DOMAIN_XBARCLK;
+
+        clk->namemap_num = NUM_NAMEMAPS;
+
+        clk->g = g;
+
+        return err;
+}
+
+u32 gv100_get_rate_cntr(struct gk20a *g, struct namemap_cfg *c) {
+        u32 cntr = 0;
+        u64 cntr_start = 0;
+        u64 cntr_stop = 0;
+
+        struct clk_gk20a *clk = &g->clk;
+
+        if ((c == NULL) || (c->cntr.reg_ctrl_addr == 0U) ||
+                (c->cntr.reg_cntr_addr[0] == 0U) ||
+                (c->cntr.reg_cntr_addr[1]) == 0U) {
+                        return 0;
+        }
+
+        nvgpu_mutex_acquire(&clk->clk_mutex);
+
+        /* Read the counter values */
+        /* Counter is 36bits , 32 bits on addr[0] and 4 lsb on addr[1] others zero*/
+        cntr_start = (u64)gk20a_readl(g, c->cntr.reg_cntr_addr[0]);
+        cntr_start += ((u64)gk20a_readl(g, c->cntr.reg_cntr_addr[1]) << 32);
+        nvgpu_udelay(XTAL_CNTR_DELAY);
+        cntr_stop = (u64) gk20a_readl(g, c->cntr.reg_cntr_addr[0]);
+        cntr_stop += ((u64)gk20a_readl(g, c->cntr.reg_cntr_addr[1]) << 32);
+        /*Calculate the difference and convert to KHz*/
+        cntr = (u32)((cntr_stop - cntr_start) / 10ULL);
+        nvgpu_mutex_release(&clk->clk_mutex);
+
+        return cntr;
+
+}
+
+int gv100_suspend_clk_support(struct gk20a *g)
+{
+        nvgpu_mutex_destroy(&g->clk.clk_mutex);
+        return 0;
+}
diff --git a/drivers/gpu/nvgpu/gv100/clk_gv100.h b/drivers/gpu/nvgpu/gv100/clk_gv100.h
new file mode 100644
index 00000000..d3356a7f
--- /dev/null
+++ b/drivers/gpu/nvgpu/gv100/clk_gv100.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2016-2018, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#ifndef CLK_GV100_H
+#define CLK_GV100_H
+
+#include <nvgpu/lock.h>
+#include "gk20a/gk20a.h"
+
+#define CLK_NAMEMAP_INDEX_GPCCLK        0x00
+#define CLK_NAMEMAP_INDEX_XBARCLK       0x02
+#define CLK_NAMEMAP_INDEX_SYSCLK        0x07    /* SYSPLL */
+#define CLK_NAMEMAP_INDEX_DRAMCLK       0x20    /* DRAMPLL */
+
+#define CLK_DEFAULT_CNTRL_SETTLE_RETRIES 10
+#define CLK_DEFAULT_CNTRL_SETTLE_USECS   5
+#define CLK_MAX_CNTRL_REGISTERS   2
+
+#define XTAL_CNTR_CLKS          27000   /* 1000usec at 27KHz XTAL */
+#define XTAL_CNTR_DELAY         10000   /* we need acuracy up to the 10ms   */
+#define XTAL_SCALE_TO_KHZ       1
+#define NUM_NAMEMAPS    (3U)
+#define XTAL4X_KHZ 108000
+
+u32 gv100_get_rate_cntr(struct gk20a *g, struct namemap_cfg *c);
+struct namemap_cfg {
+        u32 namemap;
+        u32 is_enable;  /* Namemap enabled */
+        u32 is_counter; /* Using cntr */
+        struct gk20a *g;
+        struct {
+                u32 reg_ctrl_addr;
+                u32 reg_ctrl_idx;
+                u32 reg_cntr_addr[CLK_MAX_CNTRL_REGISTERS];
+        } cntr;
+        u32 scale;
+        char name[24];
+};
+
+int gv100_init_clk_support(struct gk20a *g);
+u32 gv100_crystal_clk_hz(struct gk20a *g);
+unsigned long gv100_clk_measure_freq(struct gk20a *g, u32 api_domain);
+int gv100_suspend_clk_support(struct gk20a *g);
+
+#endif /* CLK_GV100_H */
diff --git a/drivers/gpu/nvgpu/gv100/hal_gv100.c b/drivers/gpu/nvgpu/gv100/hal_gv100.c
index 041422e0..7cd466c3 100644
--- a/drivers/gpu/nvgpu/gv100/hal_gv100.c
+++ b/drivers/gpu/nvgpu/gv100/hal_gv100.c
@@ -66,13 +66,11 @@
 #include "gm20b/pmu_gm20b.h"
 #include "gm20b/acr_gm20b.h"
 
-#include "gp106/clk_gp106.h"
 #include "gp106/clk_arb_gp106.h"
 #include "gp106/pmu_gp106.h"
 #include "gp106/acr_gp106.h"
 #include "gp106/sec2_gp106.h"
 #include "gp106/bios_gp106.h"
-#include "gp106/clk_gp106.h"
 #include "gp106/flcn_gp106.h"
 
 #include "gp10b/gr_gp10b.h"
@@ -107,6 +105,7 @@
 #include "gv100/nvlink_gv100.h"
 #include "gv100/regops_gv100.h"
 #include "gv100/perf_gv100.h"
+#include "gv100/clk_gv100.h"
 
 #include <nvgpu/ptimer.h>
 #include <nvgpu/debug.h>
@@ -768,11 +767,11 @@ static const struct gpu_ops gv100_ops = {
                 .secured_pmu_start = gm20b_secured_pmu_start,
         },
         .clk = {
-                .init_clk_support = gp106_init_clk_support,
-                .get_crystal_clk_hz = gp106_crystal_clk_hz,
-                .get_rate_cntr = gp106_get_rate_cntr,
-                .measure_freq = gp106_clk_measure_freq,
-                .suspend_clk_support = gp106_suspend_clk_support,
+                .init_clk_support = gv100_init_clk_support,
+                .get_crystal_clk_hz = gv100_crystal_clk_hz,
+                .get_rate_cntr = gv100_get_rate_cntr,
+                .measure_freq = gv100_clk_measure_freq,
+                .suspend_clk_support = gv100_suspend_clk_support,
                 .perf_pmu_vfe_load = gv100_perf_pmu_vfe_load,
         },
         .clk_arb = {
diff --git a/drivers/gpu/nvgpu/include/nvgpu/hw/gv100/hw_trim_gv100.h b/drivers/gpu/nvgpu/include/nvgpu/hw/gv100/hw_trim_gv100.h
index 9e7ceaff..f1b6da28 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/hw/gv100/hw_trim_gv100.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/hw/gv100/hw_trim_gv100.h
@@ -196,4 +196,52 @@ static inline u32 trim_sys_nvl_common_clk_alt_switch_finalsel_onesrcclk_f(void)
 {
         return 0x3U;
 }
+static inline u32 trim_gpc_bcast_fr_clk_cntr_ncgpcclk_cfg_r(void)
+{
+        return 0x00132a70U;
+}
+static inline u32 trim_gpc_bcast_fr_clk_cntr_ncgpcclk_cfg_source_gpcclk_f(void)
+{
+        return 0x10000000U;
+}
+static inline u32 trim_gpc_bcast_fr_clk_cntr_ncgpcclk_cnt0_r(void)
+{
+        return 0x00132a74U;
+}
+static inline u32 trim_gpc_bcast_fr_clk_cntr_ncgpcclk_cnt1_r(void)
+{
+        return 0x00132a78U;
+}
+static inline u32 trim_sys_nafll_fr_clk_cntr_xbarclk_cfg_r(void)
+{
+        return 0x00136470U;
+}
+static inline u32 trim_sys_nafll_fr_clk_cntr_xbarclk_cfg_source_xbarclk_f(void)
+{
+        return 0x10000000U;
+}
+static inline u32 trim_sys_nafll_fr_clk_cntr_xbarclk_cntr0_r(void)
+{
+        return 0x00136474U;
+}
+static inline u32 trim_sys_nafll_fr_clk_cntr_xbarclk_cntr1_r(void)
+{
+        return 0x00136478U;
+}
+static inline u32 trim_sys_fr_clk_cntr_sysclk_cfg_r(void)
+{
+        return 0x0013762cU;
+}
+static inline u32 trim_sys_fr_clk_cntr_sysclk_cfg_source_sysclk_f(void)
+{
+        return 0x20000000U;
+}
+static inline u32 trim_sys_fr_clk_cntr_sysclk_cntr0_r(void)
+{
+        return 0x00137630U;
+}
+static inline u32 trim_sys_fr_clk_cntr_sysclk_cntr1_r(void)
+{
+        return 0x00137634U;
+}
 #endif
diff --git a/drivers/gpu/nvgpu/os/linux/debug_clk_gv100.c b/drivers/gpu/nvgpu/os/linux/debug_clk_gv100.c
new file mode 100644
index 00000000..623f2b6b
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/linux/debug_clk_gv100.c
@@ -0,0 +1,193 @@
+/*
+ * Copyright (c) 2018, 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 "gv100/clk_gv100.h"
+
+#include "os_linux.h"
+
+void nvgpu_clk_arb_pstate_change_lock(struct gk20a *g, bool lock);
+
+static int gv100_get_rate_show(void *data , u64 *val)
+{
+        struct namemap_cfg *c = (struct namemap_cfg *)data;
+        struct gk20a *g = c->g;
+
+        if (!g->ops.clk.get_rate_cntr)
+                return -EINVAL;
+
+        *val = c->is_counter ? (u64)c->scale * g->ops.clk.get_rate_cntr(g, c) :
+                0 /* TODO PLL read */;
+
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(get_rate_fops, gv100_get_rate_show, NULL, "%llu\n");
+
+static int sys_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_SYS);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int sys_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_SYS);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(sys_cfc_fops, sys_cfc_read, sys_cfc_write, "%llu\n");
+
+static int ltc_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_LTC);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int ltc_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_LTC);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(ltc_cfc_fops, ltc_cfc_read, ltc_cfc_write, "%llu\n");
+
+static int xbar_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_XBAR);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int xbar_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_XBAR);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(xbar_cfc_fops, xbar_cfc_read,
+                        xbar_cfc_write, "%llu\n");
+
+static int gpc_cfc_read(void *data , u64 *val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        bool bload = boardobjgrpmask_bitget(
+                &g->clk_pmu.clk_freq_controllers.freq_ctrl_load_mask.super,
+                CTRL_CLK_CLK_FREQ_CONTROLLER_ID_GPC0);
+
+        /* val = 1 implies CLFC is loaded or enabled */
+        *val = bload ? 1 : 0;
+        return 0;
+}
+static int gpc_cfc_write(void *data , u64 val)
+{
+        struct gk20a *g = (struct gk20a *)data;
+        int status;
+        /* val = 1 implies load or enable the CLFC */
+        bool bload = val ? true : false;
+
+        nvgpu_clk_arb_pstate_change_lock(g, true);
+        status = clk_pmu_freq_controller_load(g, bload,
+                        CTRL_CLK_CLK_FREQ_CONTROLLER_ID_GPC0);
+        nvgpu_clk_arb_pstate_change_lock(g, false);
+
+        return status;
+}
+DEFINE_SIMPLE_ATTRIBUTE(gpc_cfc_fops, gpc_cfc_read, gpc_cfc_write, "%llu\n");
+
+int gv100_clk_init_debugfs(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+        struct dentry *gpu_root = l->debugfs;
+        struct dentry *clocks_root, *clk_freq_ctlr_root;
+        struct dentry *d;
+        unsigned int i;
+
+        if (NULL == (clocks_root = debugfs_create_dir("clocks", gpu_root)))
+                return -ENOMEM;
+
+        clk_freq_ctlr_root = debugfs_create_dir("clk_freq_ctlr", gpu_root);
+        if (clk_freq_ctlr_root == NULL)
+                return -ENOMEM;
+
+        d = debugfs_create_file("sys", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &sys_cfc_fops);
+        d = debugfs_create_file("ltc", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &ltc_cfc_fops);
+        d = debugfs_create_file("xbar", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &xbar_cfc_fops);
+        d = debugfs_create_file("gpc", S_IRUGO | S_IWUSR, clk_freq_ctlr_root,
+                                g, &gpc_cfc_fops);
+
+        nvgpu_log(g, gpu_dbg_info, "g=%p", g);
+
+        for (i = 0; i < g->clk.namemap_num; i++) {
+                if (g->clk.clk_namemap[i].is_enable) {
+                        d = debugfs_create_file(
+                                g->clk.clk_namemap[i].name,
+                                S_IRUGO,
+                                clocks_root,
+                                &g->clk.clk_namemap[i],
+                                &get_rate_fops);
+                        if (!d)
+                                goto err_out;
+                }
+        }
+        return 0;
+
+err_out:
+        pr_err("%s: Failed to make debugfs node\n", __func__);
+        debugfs_remove_recursive(clocks_root);
+        return -ENOMEM;
+}
diff --git a/drivers/gpu/nvgpu/os/linux/debug_clk_gv100.h b/drivers/gpu/nvgpu/os/linux/debug_clk_gv100.h
new file mode 100644
index 00000000..38ba61bd
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/linux/debug_clk_gv100.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018, 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_CLK_GV100_H
+#define __DEBUG_CLK_GV100_H
+
+#ifdef CONFIG_DEBUG_FS
+int gv100_clk_init_debugfs(struct gk20a *g);
+#else
+inline int gv100_clk_init_debugfs(struct gk20a *g)
+{
+        return 0;
+}
+#endif
+
+#endif
diff --git a/drivers/gpu/nvgpu/os/linux/os_ops_gv100.c b/drivers/gpu/nvgpu/os/linux/os_ops_gv100.c
index f5c5a604..9d92bdfb 100644
--- a/drivers/gpu/nvgpu/os/linux/os_ops_gv100.c
+++ b/drivers/gpu/nvgpu/os/linux/os_ops_gv100.c
@@ -16,13 +16,13 @@
 
 #include "os_linux.h"
 
-#include "debug_clk_gp106.h"
+#include "debug_clk_gv100.h"
 #include "debug_therm_gp106.h"
 #include "debug_fecs_trace.h"
 
 static struct nvgpu_os_linux_ops gv100_os_linux_ops = {
         .clk = {
-                .init_debugfs = gp106_clk_init_debugfs,
+                .init_debugfs = gv100_clk_init_debugfs,
         },
         .therm = {
                 .init_debugfs = gp106_therm_init_debugfs,