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>

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;
+}