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_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 3afe361..47805a4 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -1249,6 +1249,7 @@
/* Leave 1M for line length buffer & misc. */
compressed_fb = drm_mm_search_free(&dev_priv->vram, size, 4096, 0);
if (!compressed_fb) {
+ dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
i915_warn_stolen(dev);
return;
}
@@ -1256,6 +1257,7 @@
compressed_fb = drm_mm_get_block(compressed_fb, size, 4096);
if (!compressed_fb) {
i915_warn_stolen(dev);
+ dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
return;
}