[Intel-gfx] [PATCH] drm/i915: debugfs interface to read module parameters

[Dave Gordon]

It can be useful to know what the driver's parameters have ended up set
to after sanitisation, so this commit adds a debugfs function to print
the current values of all the module parameters.
---
 drivers/gpu/drm/i915/i915_debugfs.c |   45 +++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 2ad4c48..9d75efc 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2819,6 +2819,50 @@ static int i915_ddb_info(struct seq_file *m, void *unused)
 	return 0;
 }
 
+static int i915_params(struct seq_file *m, void *unused)
+{
+	size_t extra;
+
+	seq_printf(m, "i915.%s=%d\n", "modeset", i915.modeset);
+	seq_printf(m, "i915.%s=%d\n", "panel_ignore_lid", i915.panel_ignore_lid);
+	seq_printf(m, "i915.%s=%u\n", "powersave", i915.powersave);
+	seq_printf(m, "i915.%s=%d\n", "semaphores", i915.semaphores);
+	seq_printf(m, "i915.%s=%u\n", "lvds_downclock", i915.lvds_downclock);
+	seq_printf(m, "i915.%s=%d\n", "lvds_channel_mode", i915.lvds_channel_mode);
+	seq_printf(m, "i915.%s=%d\n", "panel_use_ssc", i915.panel_use_ssc);
+	seq_printf(m, "i915.%s=%d\n", "vbt_sdvo_panel_type", i915.vbt_sdvo_panel_type);
+	seq_printf(m, "i915.%s=%d\n", "enable_rc6", i915.enable_rc6);
+	seq_printf(m, "i915.%s=%d\n", "enable_fbc", i915.enable_fbc);
+	seq_printf(m, "i915.%s=%d\n", "enable_ppgtt", i915.enable_ppgtt);
+	seq_printf(m, "i915.%s=%d\n", "enable_execlists", i915.enable_execlists);
+	seq_printf(m, "i915.%s=%d\n", "enable_psr", i915.enable_psr);
+	seq_printf(m, "i915.%s=%u\n", "preliminary_hw_support", i915.preliminary_hw_support);
+	seq_printf(m, "i915.%s=%d\n", "disable_power_well", i915.disable_power_well);
+	seq_printf(m, "i915.%s=%d\n", "enable_ips", i915.enable_ips);
+	seq_printf(m, "i915.%s=%d\n", "invert_brightness", i915.invert_brightness);
+	seq_printf(m, "i915.%s=%d\n", "enable_cmd_parser", i915.enable_cmd_parser);
+	/* leave bools at the end to not create holes */
+	seq_printf(m, "i915.%s=%#x\n", "enable_hangcheck", i915.enable_hangcheck);
+	seq_printf(m, "i915.%s=%#x\n", "fastboot", i915.fastboot);
+	seq_printf(m, "i915.%s=%#x\n", "prefault_disable", i915.prefault_disable);
+	seq_printf(m, "i915.%s=%#x\n", "reset", i915.reset);
+	seq_printf(m, "i915.%s=%#x\n", "disable_display", i915.disable_display);
+	seq_printf(m, "i915.%s=%#x\n", "disable_vtd_wa", i915.disable_vtd_wa);
+	seq_printf(m, "i915.%s=%d\n", "use_mmio_flip", i915.use_mmio_flip);
+	seq_printf(m, "i915.%s=%#x\n", "mmio_debug", i915.mmio_debug);
+	seq_printf(m, "i915.%s=%#x\n", "verbose_state_checks", i915.verbose_state_checks);
+
+	/* Print a message if new members have been added without this code being updated */
+	extra = sizeof(struct i915_params)
+		- offsetof(struct i915_params, verbose_state_checks)
+		- sizeof(i915.verbose_state_checks);
+	if (extra)
+		seq_printf(m, "Note: %lu bytes of padding or unknown options found after i915.%s\n",
+				extra, "verbose_state_checks");
+
+	return 0;
+}
+
 struct pipe_crc_info {
 	const char *name;
 	struct drm_device *dev;
@@ -4433,6 +4477,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_dp_mst_info", i915_dp_mst_info, 0},
 	{"i915_wa_registers", i915_wa_registers, 0},
 	{"i915_ddb_info", i915_ddb_info, 0},
+	{"i915_params", i915_params, 0},
 };
 #define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)
 
-- 
1.7.9.5