gpu: nvgpu: move fecs trace debugfs to linux

Add fecs trace debugfs initialization as an os op. The
debugfs nodes are set up for gpu versions which call
gk20a_fecs_trace_init().

JIRA NVGPU-602

Change-Id: I606ec31acbf04f633500be4c342db32f3f537794
Signed-off-by: Nitin Kumbhar <nkumbhar@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/1812449
Reviewed-by: Deepak Nibade <dnibade@nvidia.com>
GVS: Gerrit_Virtual_Submit
Reviewed-by: svc-misra-checker <svc-misra-checker@nvidia.com>
Reviewed-by: Alex Waterman <alexw@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>

13 files changed, 349 insertions, 175 deletions

diff --git a/drivers/gpu/nvgpu/Makefile b/drivers/gpu/nvgpu/Makefile
index a3372cef..3b6a022a 100644
--- a/drivers/gpu/nvgpu/Makefile
+++ b/drivers/gpu/nvgpu/Makefile
@@ -53,6 +53,7 @@ nvgpu-y += \
         os/linux/os_ops_gp10b.o \
         os/linux/os_ops_gp106.o \
         os/linux/os_ops_gv100.o \
+        os/linux/os_ops_gv11b.o \
         os/linux/kmem.o \
         os/linux/timers.o \
         os/linux/ioctl.o \
@@ -115,6 +116,12 @@ endif
 nvgpu-$(CONFIG_GK20A_CTXSW_TRACE) += \
         os/linux/ctxsw_trace.o
 
+ifeq ($(CONFIG_GK20A_CTXSW_TRACE),y)
+nvgpu-$(CONFIG_DEBUG_FS) += \
+        os/linux/debug_fecs_trace.o
+endif
+
+
 nvgpu-$(CONFIG_TEGRA_GK20A) += \
         os/linux/module.o \
         os/linux/module_usermode.o \
diff --git a/drivers/gpu/nvgpu/gk20a/fecs_trace_gk20a.c b/drivers/gpu/nvgpu/gk20a/fecs_trace_gk20a.c
index 3134df4d..b30d1743 100644
--- a/drivers/gpu/nvgpu/gk20a/fecs_trace_gk20a.c
+++ b/drivers/gpu/nvgpu/gk20a/fecs_trace_gk20a.c
@@ -20,10 +20,6 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
-#ifdef CONFIG_DEBUG_FS
-#include <linux/debugfs.h>
-#endif
-
 #include <nvgpu/kmem.h>
 #include <nvgpu/dma.h>
 #include <nvgpu/enabled.h>
@@ -43,32 +39,13 @@
 #include "fecs_trace_gk20a.h"
 #include "gk20a.h"
 #include "gr_gk20a.h"
-#include "os/linux/os_linux.h"
 
 #include <nvgpu/log.h>
+#include <nvgpu/fecs_trace.h>
 
 #include <nvgpu/hw/gk20a/hw_ctxsw_prog_gk20a.h>
 #include <nvgpu/hw/gk20a/hw_gr_gk20a.h>
 
-/*
- * If HW circular buffer is getting too many "buffer full" conditions,
- * increasing this constant should help (it drives Linux' internal buffer size).
- */
-#define GK20A_FECS_TRACE_NUM_RECORDS            (1 << 10)
-#define GK20A_FECS_TRACE_HASH_BITS              8 /* 2^8 */
-#define GK20A_FECS_TRACE_FRAME_PERIOD_US        (1000000ULL/60ULL)
-#define GK20A_FECS_TRACE_PTIMER_SHIFT           5
-
-struct gk20a_fecs_trace_record {
-        u32 magic_lo;
-        u32 magic_hi;
-        u32 context_id;
-        u32 context_ptr;
-        u32 new_context_id;
-        u32 new_context_ptr;
-        u64 ts[];
-};
-
 struct gk20a_fecs_trace_hash_ent {
         u32 context_ptr;
         pid_t pid;
@@ -85,29 +62,33 @@ struct gk20a_fecs_trace {
 };
 
 #ifdef CONFIG_GK20A_CTXSW_TRACE
-static inline u32 gk20a_fecs_trace_record_ts_tag_v(u64 ts)
+u32 gk20a_fecs_trace_record_ts_tag_invalid_ts_v(void)
+{
+        return ctxsw_prog_record_timestamp_timestamp_hi_tag_invalid_timestamp_v();
+}
+
+u32 gk20a_fecs_trace_record_ts_tag_v(u64 ts)
 {
         return ctxsw_prog_record_timestamp_timestamp_hi_tag_v((u32) (ts >> 32));
 }
 
-static inline u64 gk20a_fecs_trace_record_ts_timestamp_v(u64 ts)
+u64 gk20a_fecs_trace_record_ts_timestamp_v(u64 ts)
 {
         return ts & ~(((u64)ctxsw_prog_record_timestamp_timestamp_hi_tag_m()) << 32);
 }
 
-
 static u32 gk20a_fecs_trace_fecs_context_ptr(struct gk20a *g, struct channel_gk20a *ch)
 {
         return (u32) (nvgpu_inst_block_addr(g, &ch->inst_block) >> 12LL);
 }
 
-static inline int gk20a_fecs_trace_num_ts(void)
+int gk20a_fecs_trace_num_ts(void)
 {
         return (ctxsw_prog_record_timestamp_record_size_in_bytes_v()
                 - sizeof(struct gk20a_fecs_trace_record)) / sizeof(u64);
 }
 
-static struct gk20a_fecs_trace_record *gk20a_fecs_trace_get_record(
+struct gk20a_fecs_trace_record *gk20a_fecs_trace_get_record(
         struct gk20a *g, int idx)
 {
         struct nvgpu_mem *mem = &g->gr.global_ctx_buffer[FECS_TRACE_BUFFER].mem;
@@ -117,7 +98,7 @@ static struct gk20a_fecs_trace_record *gk20a_fecs_trace_get_record(
                 + (idx * ctxsw_prog_record_timestamp_record_size_in_bytes_v()));
 }
 
-static bool gk20a_fecs_trace_is_valid_record(struct gk20a_fecs_trace_record *r)
+bool gk20a_fecs_trace_is_valid_record(struct gk20a_fecs_trace_record *r)
 {
         /*
          * testing magic_hi should suffice. magic_lo is sometimes used
@@ -127,13 +108,13 @@ static bool gk20a_fecs_trace_is_valid_record(struct gk20a_fecs_trace_record *r)
                 == ctxsw_prog_record_timestamp_magic_value_hi_v_value_v());
 }
 
-static int gk20a_fecs_trace_get_read_index(struct gk20a *g)
+int gk20a_fecs_trace_get_read_index(struct gk20a *g)
 {
         return gr_gk20a_elpg_protected_call(g,
                         gk20a_readl(g, gr_fecs_mailbox1_r()));
 }
 
-static int gk20a_fecs_trace_get_write_index(struct gk20a *g)
+int gk20a_fecs_trace_get_write_index(struct gk20a *g)
 {
         return gr_gk20a_elpg_protected_call(g,
                         gk20a_readl(g, gr_fecs_mailbox0_r()));
@@ -424,147 +405,6 @@ size_t gk20a_fecs_trace_buffer_size(struct gk20a *g)
                         * ctxsw_prog_record_timestamp_record_size_in_bytes_v();
 }
 
-#ifdef CONFIG_DEBUG_FS
-/*
- * The sequence iterator functions.  We simply use the count of the
- * next line as our internal position.
- */
-static void *gk20a_fecs_trace_debugfs_ring_seq_start(
-                struct seq_file *s, loff_t *pos)
-{
-        if (*pos >= GK20A_FECS_TRACE_NUM_RECORDS)
-                return NULL;
-
-        return pos;
-}
-
-static void *gk20a_fecs_trace_debugfs_ring_seq_next(
-                struct seq_file *s, void *v, loff_t *pos)
-{
-        ++(*pos);
-        if (*pos >= GK20A_FECS_TRACE_NUM_RECORDS)
-                return NULL;
-        return pos;
-}
-
-static void gk20a_fecs_trace_debugfs_ring_seq_stop(
-                struct seq_file *s, void *v)
-{
-}
-
-static int gk20a_fecs_trace_debugfs_ring_seq_show(
-                struct seq_file *s, void *v)
-{
-        loff_t *pos = (loff_t *) v;
-        struct gk20a *g = *(struct gk20a **)s->private;
-        struct gk20a_fecs_trace_record *r =
-                gk20a_fecs_trace_get_record(g, *pos);
-        int i;
-        const u32 invalid_tag =
-            ctxsw_prog_record_timestamp_timestamp_hi_tag_invalid_timestamp_v();
-        u32 tag;
-        u64 timestamp;
-
-        seq_printf(s, "record #%lld (%p)\n", *pos, r);
-        seq_printf(s, "\tmagic_lo=%08x\n", r->magic_lo);
-        seq_printf(s, "\tmagic_hi=%08x\n", r->magic_hi);
-        if (gk20a_fecs_trace_is_valid_record(r)) {
-                seq_printf(s, "\tcontext_ptr=%08x\n", r->context_ptr);
-                seq_printf(s, "\tcontext_id=%08x\n", r->context_id);
-                seq_printf(s, "\tnew_context_ptr=%08x\n", r->new_context_ptr);
-                seq_printf(s, "\tnew_context_id=%08x\n", r->new_context_id);
-                for (i = 0; i < gk20a_fecs_trace_num_ts(); i++) {
-                        tag = gk20a_fecs_trace_record_ts_tag_v(r->ts[i]);
-                        if (tag == invalid_tag)
-                                continue;
-                        timestamp = gk20a_fecs_trace_record_ts_timestamp_v(r->ts[i]);
-                        timestamp <<= GK20A_FECS_TRACE_PTIMER_SHIFT;
-                        seq_printf(s, "\ttag=%02x timestamp=%012llx\n", tag, timestamp);
-                }
-        }
-        return 0;
-}
-
-/*
- * Tie them all together into a set of seq_operations.
- */
-static const struct seq_operations gk20a_fecs_trace_debugfs_ring_seq_ops = {
-        .start = gk20a_fecs_trace_debugfs_ring_seq_start,
-        .next = gk20a_fecs_trace_debugfs_ring_seq_next,
-        .stop = gk20a_fecs_trace_debugfs_ring_seq_stop,
-        .show = gk20a_fecs_trace_debugfs_ring_seq_show
-};
-
-/*
- * Time to set up the file operations for our /proc file.  In this case,
- * all we need is an open function which sets up the sequence ops.
- */
-
-static int gk20a_ctxsw_debugfs_ring_open(struct inode *inode,
-        struct file *file)
-{
-        struct gk20a **p;
-
-        if (!capable(CAP_SYS_ADMIN))
-                return -EPERM;
-
-        p = __seq_open_private(file, &gk20a_fecs_trace_debugfs_ring_seq_ops,
-                sizeof(struct gk20a *));
-        if (!p)
-                return -ENOMEM;
-
-        *p = (struct gk20a *)inode->i_private;
-        return 0;
-};
-
-/*
- * The file operations structure contains our open function along with
- * set of the canned seq_ ops.
- */
-static const struct file_operations gk20a_fecs_trace_debugfs_ring_fops = {
-        .owner = THIS_MODULE,
-        .open = gk20a_ctxsw_debugfs_ring_open,
-        .read = seq_read,
-        .llseek = seq_lseek,
-        .release = seq_release_private
-};
-
-static int gk20a_fecs_trace_debugfs_read(void *arg, u64 *val)
-{
-        *val = gk20a_fecs_trace_get_read_index((struct gk20a *)arg);
-        return 0;
-}
-DEFINE_SIMPLE_ATTRIBUTE(gk20a_fecs_trace_debugfs_read_fops,
-        gk20a_fecs_trace_debugfs_read, NULL, "%llu\n");
-
-static int gk20a_fecs_trace_debugfs_write(void *arg, u64 *val)
-{
-        *val = gk20a_fecs_trace_get_write_index((struct gk20a *)arg);
-        return 0;
-}
-DEFINE_SIMPLE_ATTRIBUTE(gk20a_fecs_trace_debugfs_write_fops,
-        gk20a_fecs_trace_debugfs_write, NULL, "%llu\n");
-
-static void gk20a_fecs_trace_debugfs_init(struct gk20a *g)
-{
-        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
-
-        debugfs_create_file("ctxsw_trace_read", 0600, l->debugfs, g,
-                &gk20a_fecs_trace_debugfs_read_fops);
-        debugfs_create_file("ctxsw_trace_write", 0600, l->debugfs, g,
-                &gk20a_fecs_trace_debugfs_write_fops);
-        debugfs_create_file("ctxsw_trace_ring", 0600, l->debugfs, g,
-                &gk20a_fecs_trace_debugfs_ring_fops);
-}
-
-#else
-
-static void gk20a_fecs_trace_debugfs_init(struct gk20a *g)
-{
-}
-
-#endif /* CONFIG_DEBUG_FS */
-
 int gk20a_fecs_trace_init(struct gk20a *g)
 {
         struct gk20a_fecs_trace *trace;
@@ -589,8 +429,6 @@ int gk20a_fecs_trace_init(struct gk20a *g)
 
         __nvgpu_set_enabled(g, NVGPU_SUPPORT_FECS_CTXSW_TRACE, true);
 
-        gk20a_fecs_trace_debugfs_init(g);
-
         trace->init = true;
 
         return 0;
diff --git a/drivers/gpu/nvgpu/include/nvgpu/fecs_trace.h b/drivers/gpu/nvgpu/include/nvgpu/fecs_trace.h
new file mode 100644
index 00000000..5dc35302
--- /dev/null
+++ b/drivers/gpu/nvgpu/include/nvgpu/fecs_trace.h
@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 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 NVGPU_FECS_TRACE_H
+#define NVGPU_FECS_TRACE_H
+
+struct gk20a;
+
+/*
+ * If HW circular buffer is getting too many "buffer full" conditions,
+ * increasing this constant should help (it drives Linux' internal buffer size).
+ */
+#define GK20A_FECS_TRACE_NUM_RECORDS            (1 << 10)
+#define GK20A_FECS_TRACE_HASH_BITS              8 /* 2^8 */
+#define GK20A_FECS_TRACE_FRAME_PERIOD_US        (1000000ULL/60ULL)
+#define GK20A_FECS_TRACE_PTIMER_SHIFT           5
+
+struct gk20a_fecs_trace_record {
+        u32 magic_lo;
+        u32 magic_hi;
+        u32 context_id;
+        u32 context_ptr;
+        u32 new_context_id;
+        u32 new_context_ptr;
+        u64 ts[];
+};
+
+#ifdef CONFIG_GK20A_CTXSW_TRACE
+u32 gk20a_fecs_trace_record_ts_tag_invalid_ts_v(void);
+u32 gk20a_fecs_trace_record_ts_tag_v(u64 ts);
+u64 gk20a_fecs_trace_record_ts_timestamp_v(u64 ts);
+int gk20a_fecs_trace_num_ts(void);
+struct gk20a_fecs_trace_record *gk20a_fecs_trace_get_record(struct gk20a *g,
+        int idx);
+bool gk20a_fecs_trace_is_valid_record(struct gk20a_fecs_trace_record *r);
+int gk20a_fecs_trace_get_read_index(struct gk20a *g);
+int gk20a_fecs_trace_get_write_index(struct gk20a *g);
+
+#endif /* CONFIG_GK20A_CTXSW_TRACE */
+
+#endif
diff --git a/drivers/gpu/nvgpu/os/linux/debug_fecs_trace.c b/drivers/gpu/nvgpu/os/linux/debug_fecs_trace.c
new file mode 100644
index 00000000..9e72d2ce
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/linux/debug_fecs_trace.c
@@ -0,0 +1,154 @@
+/*
+ * 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 <nvgpu/fecs_trace.h>
+
+#include "os_linux.h"
+
+/*
+ * The sequence iterator functions.  We simply use the count of the
+ * next line as our internal position.
+ */
+static void *gk20a_fecs_trace_debugfs_ring_seq_start(
+                struct seq_file *s, loff_t *pos)
+{
+        if (*pos >= GK20A_FECS_TRACE_NUM_RECORDS)
+                return NULL;
+
+        return pos;
+}
+
+static void *gk20a_fecs_trace_debugfs_ring_seq_next(
+                struct seq_file *s, void *v, loff_t *pos)
+{
+        ++(*pos);
+        if (*pos >= GK20A_FECS_TRACE_NUM_RECORDS)
+                return NULL;
+        return pos;
+}
+
+static void gk20a_fecs_trace_debugfs_ring_seq_stop(
+                struct seq_file *s, void *v)
+{
+}
+
+static int gk20a_fecs_trace_debugfs_ring_seq_show(
+                struct seq_file *s, void *v)
+{
+        loff_t *pos = (loff_t *) v;
+        struct gk20a *g = *(struct gk20a **)s->private;
+        struct gk20a_fecs_trace_record *r =
+                gk20a_fecs_trace_get_record(g, *pos);
+        int i;
+        const u32 invalid_tag = gk20a_fecs_trace_record_ts_tag_invalid_ts_v();
+        u32 tag;
+        u64 timestamp;
+
+        seq_printf(s, "record #%lld (%p)\n", *pos, r);
+        seq_printf(s, "\tmagic_lo=%08x\n", r->magic_lo);
+        seq_printf(s, "\tmagic_hi=%08x\n", r->magic_hi);
+        if (gk20a_fecs_trace_is_valid_record(r)) {
+                seq_printf(s, "\tcontext_ptr=%08x\n", r->context_ptr);
+                seq_printf(s, "\tcontext_id=%08x\n", r->context_id);
+                seq_printf(s, "\tnew_context_ptr=%08x\n", r->new_context_ptr);
+                seq_printf(s, "\tnew_context_id=%08x\n", r->new_context_id);
+                for (i = 0; i < gk20a_fecs_trace_num_ts(); i++) {
+                        tag = gk20a_fecs_trace_record_ts_tag_v(r->ts[i]);
+                        if (tag == invalid_tag)
+                                continue;
+                        timestamp = gk20a_fecs_trace_record_ts_timestamp_v(r->ts[i]);
+                        timestamp <<= GK20A_FECS_TRACE_PTIMER_SHIFT;
+                        seq_printf(s, "\ttag=%02x timestamp=%012llx\n", tag, timestamp);
+                }
+        }
+        return 0;
+}
+
+/*
+ * Tie them all together into a set of seq_operations.
+ */
+static const struct seq_operations gk20a_fecs_trace_debugfs_ring_seq_ops = {
+        .start = gk20a_fecs_trace_debugfs_ring_seq_start,
+        .next = gk20a_fecs_trace_debugfs_ring_seq_next,
+        .stop = gk20a_fecs_trace_debugfs_ring_seq_stop,
+        .show = gk20a_fecs_trace_debugfs_ring_seq_show
+};
+
+/*
+ * Time to set up the file operations for our /proc file.  In this case,
+ * all we need is an open function which sets up the sequence ops.
+ */
+
+static int gk20a_ctxsw_debugfs_ring_open(struct inode *inode,
+        struct file *file)
+{
+        struct gk20a **p;
+
+        if (!capable(CAP_SYS_ADMIN))
+                return -EPERM;
+
+        p = __seq_open_private(file, &gk20a_fecs_trace_debugfs_ring_seq_ops,
+                sizeof(struct gk20a *));
+        if (!p)
+                return -ENOMEM;
+
+        *p = (struct gk20a *)inode->i_private;
+        return 0;
+};
+
+/*
+ * The file operations structure contains our open function along with
+ * set of the canned seq_ ops.
+ */
+static const struct file_operations gk20a_fecs_trace_debugfs_ring_fops = {
+        .owner = THIS_MODULE,
+        .open = gk20a_ctxsw_debugfs_ring_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = seq_release_private
+};
+
+static int gk20a_fecs_trace_debugfs_read(void *arg, u64 *val)
+{
+        *val = gk20a_fecs_trace_get_read_index((struct gk20a *)arg);
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(gk20a_fecs_trace_debugfs_read_fops,
+        gk20a_fecs_trace_debugfs_read, NULL, "%llu\n");
+
+static int gk20a_fecs_trace_debugfs_write(void *arg, u64 *val)
+{
+        *val = gk20a_fecs_trace_get_write_index((struct gk20a *)arg);
+        return 0;
+}
+DEFINE_SIMPLE_ATTRIBUTE(gk20a_fecs_trace_debugfs_write_fops,
+        gk20a_fecs_trace_debugfs_write, NULL, "%llu\n");
+
+int nvgpu_fecs_trace_init_debugfs(struct gk20a *g)
+{
+        struct nvgpu_os_linux *l = nvgpu_os_linux_from_gk20a(g);
+
+        debugfs_create_file("ctxsw_trace_read", 0600, l->debugfs, g,
+                &gk20a_fecs_trace_debugfs_read_fops);
+        debugfs_create_file("ctxsw_trace_write", 0600, l->debugfs, g,
+                &gk20a_fecs_trace_debugfs_write_fops);
+        debugfs_create_file("ctxsw_trace_ring", 0600, l->debugfs, g,
+                &gk20a_fecs_trace_debugfs_ring_fops);
+
+        return 0;
+}
diff --git a/drivers/gpu/nvgpu/os/linux/debug_fecs_trace.h b/drivers/gpu/nvgpu/os/linux/debug_fecs_trace.h
new file mode 100644
index 00000000..a545f2db
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/linux/debug_fecs_trace.h
@@ -0,0 +1,30 @@
+/*
+ * 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 LINUX_DEBUG_FECS_TRACE_H
+#define LINUX_DEBUG_FECS_TRACE_H
+
+struct gk20a;
+
+#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_GK20A_CTXSW_TRACE)
+int nvgpu_fecs_trace_init_debugfs(struct gk20a *g);
+#else
+int nvgpu_fecs_trace_init_debugfs(struct gk20a *g)
+{
+        return 0;
+}
+#endif
+#endif
diff --git a/drivers/gpu/nvgpu/os/linux/module.c b/drivers/gpu/nvgpu/os/linux/module.c
index 85439b88..ff4d9a4c 100644
--- a/drivers/gpu/nvgpu/os/linux/module.c
+++ b/drivers/gpu/nvgpu/os/linux/module.c
@@ -216,6 +216,14 @@ int nvgpu_finalize_poweron_linux(struct nvgpu_os_linux *l)
                 }
         }
 
+        if (l->ops.fecs_trace.init_debugfs) {
+                err = l->ops.fecs_trace.init_debugfs(g);
+                if (err) {
+                        nvgpu_err(g, "failed to init linux fecs trace debugfs");
+                        return err;
+                }
+        }
+
         err = nvgpu_pmgr_init_debugfs_linux(l);
         if (err) {
                 nvgpu_err(g, "failed to init linux pmgr debugfs");
diff --git a/drivers/gpu/nvgpu/os/linux/os_linux.h b/drivers/gpu/nvgpu/os/linux/os_linux.h
index ff871fe5..a9a9ebb6 100644
--- a/drivers/gpu/nvgpu/os/linux/os_linux.h
+++ b/drivers/gpu/nvgpu/os/linux/os_linux.h
@@ -46,6 +46,10 @@ struct nvgpu_os_linux_ops {
         struct {
                 int (*init_debugfs)(struct gk20a *g);
         } therm;
+
+        struct {
+                int (*init_debugfs)(struct gk20a *g);
+        } fecs_trace;
 };
 
 struct nvgpu_os_linux {
diff --git a/drivers/gpu/nvgpu/os/linux/os_ops.c b/drivers/gpu/nvgpu/os/linux/os_ops.c
index 5c2eb25c..f1ab4b15 100644
--- a/drivers/gpu/nvgpu/os/linux/os_ops.c
+++ b/drivers/gpu/nvgpu/os/linux/os_ops.c
@@ -19,6 +19,7 @@
 #include "os_ops_gm20b.h"
 #include "os_ops_gp10b.h"
 #include "os_ops_gp106.h"
+#include "os_ops_gv11b.h"
 #include "os_ops_gv100.h"
 
 #if defined(CONFIG_TEGRA_GPU_NEXT)
@@ -44,6 +45,9 @@ int nvgpu_init_os_linux_ops(struct nvgpu_os_linux *l)
         case NVGPU_GPUID_GV100:
                 nvgpu_gv100_init_os_ops(l);
                 break;
+        case NVGPU_GPUID_GV11B:
+                nvgpu_gv11b_init_os_ops(l);
+                break;
 #if defined(CONFIG_TEGRA_GPU_NEXT)
         case NVGPU_GPUID_NEXT:
                 NVGPU_NEXT_INIT_OS_OPS(l);
diff --git a/drivers/gpu/nvgpu/os/linux/os_ops_gp106.c b/drivers/gpu/nvgpu/os/linux/os_ops_gp106.c
index 662f4551..14f1b004 100644
--- a/drivers/gpu/nvgpu/os/linux/os_ops_gp106.c
+++ b/drivers/gpu/nvgpu/os/linux/os_ops_gp106.c
@@ -18,6 +18,7 @@
 
 #include "debug_clk_gp106.h"
 #include "debug_therm_gp106.h"
+#include "debug_fecs_trace.h"
 
 static struct nvgpu_os_linux_ops gp106_os_linux_ops = {
         .clk = {
@@ -26,10 +27,14 @@ static struct nvgpu_os_linux_ops gp106_os_linux_ops = {
         .therm = {
                 .init_debugfs = gp106_therm_init_debugfs,
         },
+        .fecs_trace = {
+                .init_debugfs = nvgpu_fecs_trace_init_debugfs,
+        },
 };
 
 void nvgpu_gp106_init_os_ops(struct nvgpu_os_linux *l)
 {
         l->ops.clk = gp106_os_linux_ops.clk;
         l->ops.therm = gp106_os_linux_ops.therm;
+        l->ops.fecs_trace = gp106_os_linux_ops.fecs_trace;
 }
diff --git a/drivers/gpu/nvgpu/os/linux/os_ops_gp10b.c b/drivers/gpu/nvgpu/os/linux/os_ops_gp10b.c
index 984dcdc0..e2891f73 100644
--- a/drivers/gpu/nvgpu/os/linux/os_ops_gp10b.c
+++ b/drivers/gpu/nvgpu/os/linux/os_ops_gp10b.c
@@ -17,6 +17,7 @@
 #include "os_linux.h"
 
 #include "cde_gp10b.h"
+#include "debug_fecs_trace.h"
 
 static struct nvgpu_os_linux_ops gp10b_os_linux_ops = {
 #ifdef CONFIG_NVGPU_SUPPORT_CDE
@@ -26,6 +27,9 @@ static struct nvgpu_os_linux_ops gp10b_os_linux_ops = {
                 .populate_scatter_buffer = gp10b_populate_scatter_buffer,
         },
 #endif
+        .fecs_trace = {
+                .init_debugfs = nvgpu_fecs_trace_init_debugfs,
+        },
 };
 
 void nvgpu_gp10b_init_os_ops(struct nvgpu_os_linux *l)
@@ -33,4 +37,5 @@ void nvgpu_gp10b_init_os_ops(struct nvgpu_os_linux *l)
 #ifdef CONFIG_NVGPU_SUPPORT_CDE
         l->ops.cde = gp10b_os_linux_ops.cde;
 #endif
+        l->ops.fecs_trace = gp10b_os_linux_ops.fecs_trace;
 }
diff --git a/drivers/gpu/nvgpu/os/linux/os_ops_gv100.c b/drivers/gpu/nvgpu/os/linux/os_ops_gv100.c
index 7a5174a4..f5c5a604 100644
--- a/drivers/gpu/nvgpu/os/linux/os_ops_gv100.c
+++ b/drivers/gpu/nvgpu/os/linux/os_ops_gv100.c
@@ -18,6 +18,7 @@
 
 #include "debug_clk_gp106.h"
 #include "debug_therm_gp106.h"
+#include "debug_fecs_trace.h"
 
 static struct nvgpu_os_linux_ops gv100_os_linux_ops = {
         .clk = {
@@ -26,10 +27,14 @@ static struct nvgpu_os_linux_ops gv100_os_linux_ops = {
         .therm = {
                 .init_debugfs = gp106_therm_init_debugfs,
         },
+        .fecs_trace = {
+                .init_debugfs = nvgpu_fecs_trace_init_debugfs,
+        },
 };
 
 void nvgpu_gv100_init_os_ops(struct nvgpu_os_linux *l)
 {
         l->ops.clk = gv100_os_linux_ops.clk;
         l->ops.therm = gv100_os_linux_ops.therm;
+        l->ops.fecs_trace = gv100_os_linux_ops.fecs_trace;
 }
diff --git a/drivers/gpu/nvgpu/os/linux/os_ops_gv11b.c b/drivers/gpu/nvgpu/os/linux/os_ops_gv11b.c
new file mode 100644
index 00000000..a82ad0ab
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/linux/os_ops_gv11b.c
@@ -0,0 +1,30 @@
+/*
+ * 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 "os_linux.h"
+
+#include "debug_fecs_trace.h"
+
+static struct nvgpu_os_linux_ops gv11b_os_linux_ops = {
+        .fecs_trace = {
+                .init_debugfs = nvgpu_fecs_trace_init_debugfs,
+        },
+};
+
+void nvgpu_gv11b_init_os_ops(struct nvgpu_os_linux *l)
+{
+        l->ops.fecs_trace = gv11b_os_linux_ops.fecs_trace;
+}
diff --git a/drivers/gpu/nvgpu/os/linux/os_ops_gv11b.h b/drivers/gpu/nvgpu/os/linux/os_ops_gv11b.h
new file mode 100644
index 00000000..eef6c4ac
--- /dev/null
+++ b/drivers/gpu/nvgpu/os/linux/os_ops_gv11b.h
@@ -0,0 +1,24 @@
+/*
+ * 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 LINUX_OS_OPS_GV11B_H
+#define LINUX_OS_OPS_GV11B_H
+
+struct nvgpu_os_linux;
+
+void nvgpu_gv11b_init_os_ops(struct nvgpu_os_linux *l);
+
+#endif