[Intel-gfx 4/6] drm/i915/guc: Provide debugfs for log relay sub-buf info

[Alan Previn <alan.previn.teres.alexis@xxxxxxxxx>]

In order to provide alignment between IGT intel_guc_logger tool and
i915 kernel's guc log relay channels without requiring updating both
repositories everytime a sizing change is made, provide that info
via debugfs files.

Signed-off-by: Alan Previn <alan.previn.teres.alexis@xxxxxxxxx>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc_log.c    | 10 ++++-
 drivers/gpu/drm/i915/gt/uc/intel_guc_log.h    |  2 +
 .../drm/i915/gt/uc/intel_guc_log_debugfs.c    | 41 +++++++++++++++++++
 3 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
index f454d53a8bca..35709202b09c 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
@@ -15,7 +15,7 @@
 
 static void guc_log_copy_debuglogs_for_relay(struct intel_guc_log *log);
 
-static u32 intel_guc_log_size(struct intel_guc_log *log)
+u32 intel_guc_log_size(struct intel_guc_log *log)
 {
 	/*
 	 *  GuC Log buffer Layout:
@@ -41,6 +41,12 @@ static u32 intel_guc_log_size(struct intel_guc_log *log)
 	return PAGE_SIZE + CRASH_BUFFER_SIZE + DEBUG_BUFFER_SIZE + CAPTURE_BUFFER_SIZE;
 }
 
+#define GUC_LOG_RELAY_SUBBUF_COUNT 8
+u32 intel_guc_log_relay_subbuf_count(struct intel_guc_log *log)
+{
+	return GUC_LOG_RELAY_SUBBUF_COUNT;
+}
+
 /**
  * DOC: GuC firmware log
  *
@@ -411,7 +417,7 @@ static int guc_log_relay_create(struct intel_guc_log *log)
 	 * latency, for consuming the logs from relay. Also doesn't take
 	 * up too much memory.
 	 */
-	n_subbufs = 8;
+	n_subbufs = intel_guc_log_relay_subbuf_count(log);
 
 	guc_log_relay_chan = relay_open("guc_log",
 					dev_priv->drm.primary->debugfs_root,
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h
index 18007e639be9..9e55bd7d2051 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h
@@ -73,6 +73,8 @@ unsigned int intel_guc_get_log_buffer_size(enum guc_log_buffer_type type);
 size_t intel_guc_get_log_buffer_offset(enum guc_log_buffer_type type);
 int intel_guc_log_create(struct intel_guc_log *log);
 void intel_guc_log_destroy(struct intel_guc_log *log);
+u32 intel_guc_log_size(struct intel_guc_log *log);
+u32 intel_guc_log_relay_subbuf_count(struct intel_guc_log *log);
 
 int intel_guc_log_set_level(struct intel_guc_log *log, u32 level);
 bool intel_guc_log_relay_created(const struct intel_guc_log *log);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c
index ddfbe334689f..983afc89b17e 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c
@@ -105,10 +105,49 @@ DEFINE_SIMPLE_ATTRIBUTE(guc_log_level_fops,
 			guc_log_level_get, guc_log_level_set,
 			"%lld\n");
 
+static int guc_log_relay_buf_size_get(void *data, u64 *val)
+{
+	struct intel_guc_log *log = data;
+
+	if (!log)
+		return -ENODEV;
+	if (!log->vma)
+		return -ENODEV;
+
+	*val = (u64)intel_guc_log_size(log);
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(guc_log_relay_buf_size_fops,
+			guc_log_relay_buf_size_get, NULL,
+			"%lld\n");
+
+static int guc_log_relay_subbuf_count_get(void *data, u64 *val)
+{
+	struct intel_guc_log *log = data;
+
+	if (!log)
+		return -ENODEV;
+	if (!log->vma)
+		return -ENODEV;
+
+	*val = intel_guc_log_relay_subbuf_count(log);
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(guc_log_relay_subbuf_count_fops,
+			guc_log_relay_subbuf_count_get, NULL,
+			"%lld\n");
+
 static int guc_log_relay_open(struct inode *inode, struct file *file)
 {
 	struct intel_guc_log *log = inode->i_private;
 
+	if (!log)
+		return -ENODEV;
+
 	if (!intel_guc_is_ready(log_to_guc(log)))
 		return -ENODEV;
 
@@ -166,6 +205,8 @@ void intel_guc_log_debugfs_register(struct intel_guc_log *log,
 		{ "guc_load_err_log_dump", &guc_load_err_log_dump_fops, NULL },
 		{ "guc_log_level", &guc_log_level_fops, NULL },
 		{ "guc_log_relay", &guc_log_relay_fops, NULL },
+		{ "guc_log_relay_buf_size", &guc_log_relay_buf_size_fops, NULL },
+		{ "guc_log_relay_subbuf_count", &guc_log_relay_subbuf_count_fops, NULL },
 	};
 
 	if (!intel_guc_is_supported(log_to_guc(log)))
-- 
2.25.1