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drm/i915: provide FBC status in debugfs

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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>
This commit is contained in:
Jesse Barnes 2010-02-05 12:42:41 -08:00 committed by Eric Anholt
parent 357b13c3e4
commit b5e50c3f56
4 changed files with 66 additions and 0 deletions
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49
drivers/gpu/drm/i915/i915_debugfs.c
View File

@ -477,6 +477,54 @@ static int i915_drpc_info(struct seq_file *m, void *unused)
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 @@ static struct drm_info_list i915_debugfs_list[] = {
{"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)

2
drivers/gpu/drm/i915/i915_dma.c
View File

@ -1249,6 +1249,7 @@ static void i915_setup_compression(struct drm_device *dev, int size)
/* 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 @@ static void i915_setup_compression(struct drm_device *dev, int size)
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;
}

10
drivers/gpu/drm/i915/i915_drv.h
View File

@ -192,6 +192,14 @@ struct intel_device_info {
u8 cursor_needs_physical : 1;
};
enum no_fbc_reason {
FBC_STOLEN_TOO_SMALL, /* not enough space to hold compressed buffers */
FBC_UNSUPPORTED_MODE, /* interlace or doublescanned mode */
FBC_MODE_TOO_LARGE, /* mode too large for compression */
FBC_BAD_PLANE, /* fbc not supported on plane */
FBC_NOT_TILED, /* buffer not tiled */
};
typedef struct drm_i915_private {
struct drm_device *dev;
@ -597,6 +605,8 @@ typedef struct drm_i915_private {
u8 cur_delay;
u8 min_delay;
u8 max_delay;
enum no_fbc_reason no_fbc_reason;
} drm_i915_private_t;
/** driver private structure attached to each drm_gem_object */

5
drivers/gpu/drm/i915/intel_display.c
View File

@ -1188,25 +1188,30 @@ static void intel_update_fbc(struct drm_crtc *crtc,
if (intel_fb->obj->size > dev_priv->cfb_size) {
DRM_DEBUG_KMS("framebuffer too large, disabling "
"compression\n");
dev_priv->no_fbc_reason = FBC_STOLEN_TOO_SMALL;
goto out_disable;
}
if ((mode->flags & DRM_MODE_FLAG_INTERLACE) ||
(mode->flags & DRM_MODE_FLAG_DBLSCAN)) {
DRM_DEBUG_KMS("mode incompatible with compression, "
"disabling\n");
dev_priv->no_fbc_reason = FBC_UNSUPPORTED_MODE;
goto out_disable;
}
if ((mode->hdisplay > 2048) ||
(mode->vdisplay > 1536)) {
DRM_DEBUG_KMS("mode too large for compression, disabling\n");
dev_priv->no_fbc_reason = FBC_MODE_TOO_LARGE;
goto out_disable;
}
if ((IS_I915GM(dev) || IS_I945GM(dev)) && plane != 0) {
DRM_DEBUG_KMS("plane not 0, disabling compression\n");
dev_priv->no_fbc_reason = FBC_BAD_PLANE;
goto out_disable;
}
if (obj_priv->tiling_mode != I915_TILING_X) {
DRM_DEBUG_KMS("framebuffer not tiled, disabling compression\n");
dev_priv->no_fbc_reason = FBC_NOT_TILED;
goto out_disable;
}