drm/i915: provide FBC status in debugfs
Tools like powertop want to check the current FBC status and report it
to the user. So add a debugfs file indicating whether FBC is enabled,
and if not, why.
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 55340de..96e8b9b 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -477,6 +477,54 @@
return 0;
}
+static int i915_fbc_status(struct seq_file *m, void *unused)
+{
+ struct drm_info_node *node = (struct drm_info_node *) m->private;
+ struct drm_device *dev = node->minor->dev;
+ struct drm_crtc *crtc;
+ drm_i915_private_t *dev_priv = dev->dev_private;
+ bool fbc_enabled = false;
+
+ if (!dev_priv->display.fbc_enabled) {
+ seq_printf(m, "FBC unsupported on this chipset\n");
+ return 0;
+ }
+
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ if (!crtc->enabled)
+ continue;
+ if (dev_priv->display.fbc_enabled(crtc))
+ fbc_enabled = true;
+ }
+
+ if (fbc_enabled) {
+ seq_printf(m, "FBC enabled\n");
+ } else {
+ seq_printf(m, "FBC disabled: ");
+ switch (dev_priv->no_fbc_reason) {
+ case FBC_STOLEN_TOO_SMALL:
+ seq_printf(m, "not enough stolen memory");
+ break;
+ case FBC_UNSUPPORTED_MODE:
+ seq_printf(m, "mode not supported");
+ break;
+ case FBC_MODE_TOO_LARGE:
+ seq_printf(m, "mode too large");
+ break;
+ case FBC_BAD_PLANE:
+ seq_printf(m, "FBC unsupported on plane");
+ break;
+ case FBC_NOT_TILED:
+ seq_printf(m, "scanout buffer not tiled");
+ break;
+ default:
+ seq_printf(m, "unknown reason");
+ }
+ seq_printf(m, "\n");
+ }
+ return 0;
+}
+
static int
i915_wedged_open(struct inode *inode,
struct file *filp)
@@ -599,6 +647,7 @@
{"i915_delayfreq_table", i915_delayfreq_table, 0},
{"i915_inttoext_table", i915_inttoext_table, 0},
{"i915_drpc_info", i915_drpc_info, 0},
+ {"i915_fbc_status", i915_fbc_status, 0},
};
#define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)