drm/i915/skl: Add a debugfs file to dump the DDB allocation

v2: minor conflict in i915_debugfs.c
v3: Rebase on top of the for_each_pipe() change adding dev_priv as first
    argument.
v4: minor conflict in the i915_debugfs_files array
v5: minor conflict in the i915_debugfs_files array

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index b1cbfbf..319da61 100644 (file)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2679,6 +2679,42 @@ static int i915_wa_registers(struct seq_file *m, void *unused)
        return 0;
 }
 
+static int i915_ddb_info(struct seq_file *m, void *unused)
+{
+       struct drm_info_node *node = m->private;
+       struct drm_device *dev = node->minor->dev;
+       struct drm_i915_private *dev_priv = dev->dev_private;
+       struct skl_ddb_allocation *ddb;
+       struct skl_ddb_entry *entry;
+       enum pipe pipe;
+       int plane;
+
+       drm_modeset_lock_all(dev);
+
+       ddb = &dev_priv->wm.skl_hw.ddb;
+
+       seq_printf(m, "%-15s%8s%8s%8s\n", "", "Start", "End", "Size");
+
+       for_each_pipe(dev_priv, pipe) {
+               seq_printf(m, "Pipe %c\n", pipe_name(pipe));
+
+               for_each_plane(pipe, plane) {
+                       entry = &ddb->plane[pipe][plane];
+                       seq_printf(m, "  Plane%-8d%8u%8u%8u\n", plane + 1,
+                                  entry->start, entry->end,
+                                  skl_ddb_entry_size(entry));
+               }
+
+               entry = &ddb->cursor[pipe];
+               seq_printf(m, "  %-13s%8u%8u%8u\n", "Cursor", entry->start,
+                          entry->end, skl_ddb_entry_size(entry));
+       }
+
+       drm_modeset_unlock_all(dev);
+
+       return 0;
+}
+
 struct pipe_crc_info {
        const char *name;
        struct drm_device *dev;
@@ -4252,6 +4288,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
        {"i915_shared_dplls_info", i915_shared_dplls_info, 0},
        {"i915_dp_mst_info", i915_dp_mst_info, 0},
        {"i915_wa_registers", i915_wa_registers, 0},
+       {"i915_ddb_info", i915_ddb_info, 0},
 };
 #define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)