Useful to dump current state from debugfs, if turning on the drm.debug
bit is too much overhead.
The drm_state_dump() can also be used by drivers, for example to
implement a module param that dumps state on error irqs.
Signed-off-by: Rob Clark <robdclark@xxxxxxxxx>
Reviewed-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
---
drivers/gpu/drm/drm_atomic.c | 63 +++++++++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/drm_debugfs.c | 9 +++++++
include/drm/drm_atomic.h | 7 +++++
3 files changed, 79 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index 446bdb2..eabe798 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -1549,6 +1549,69 @@ static void drm_atomic_print_state(const struct drm_atomic_state *state)
drm_atomic_connector_print_state(&p, connector_state);
}
+/**
+ * drm_state_dump - dump entire device atomic state
+ * @dev: the drm device
+ * @p: where to print the state to
+ *
+ * Just for debugging. Drivers might want an option to dump state
+ * to dmesg in case of error irq's. (Hint, you probably want to
+ * ratelimit this!)
+ *
+ * The caller must drm_modeset_lock_all(), or if this is called
+ * from error irq handler, it should not be enabled by default.
+ * (Ie. if you are debugging errors you might not care that this
+ * is racey. But calling this without all modeset locks held is
+ * not inherently safe.)
+ */
+void drm_state_dump(struct drm_device *dev, struct drm_printer *p)
+{
+ struct drm_mode_config *config = &dev->mode_config;
+ struct drm_plane *plane;
+ struct drm_crtc *crtc;
+ struct drm_connector *connector;
+
+ if (!drm_core_check_feature(dev, DRIVER_ATOMIC))
+ return;
+
+ list_for_each_entry(plane, &config->plane_list, head)
+ drm_atomic_plane_print_state(p, plane->state);
+
+ list_for_each_entry(crtc, &config->crtc_list, head)
+ drm_atomic_crtc_print_state(p, crtc->state);
+
+ list_for_each_entry(connector, &config->connector_list, head)
+ drm_atomic_connector_print_state(p, connector->state);
+}
+EXPORT_SYMBOL(drm_state_dump);
+
+#ifdef CONFIG_DEBUG_FS
+static int drm_state_info(struct seq_file *m, void *data)
+{
+ struct drm_info_node *node = (struct drm_info_node *) m->private;
+ struct drm_device *dev = node->minor->dev;
+ struct drm_printer p = drm_seq_file_printer(m);
+
+ drm_modeset_lock_all(dev);
+ drm_state_dump(dev, &p);
+ drm_modeset_unlock_all(dev);
+
+ return 0;
+}
+
+/* any use in debugfs files to dump individual planes/crtc/etc? */
+static const struct drm_info_list drm_atomic_debugfs_list[] = {
+ {"state", drm_state_info, 0},
+};
+
+int drm_atomic_debugfs_init(struct drm_minor *minor)
+{
+ return drm_debugfs_create_files(drm_atomic_debugfs_list,
+ ARRAY_SIZE(drm_atomic_debugfs_list),
+ minor->debugfs_root, minor);
+}
+#endif
+
/*
* The big monstor ioctl
*/
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c
index 1205790..2225508 100644
--- a/drivers/gpu/drm/drm_debugfs.c
+++ b/drivers/gpu/drm/drm_debugfs.c
@@ -36,6 +36,7 @@
#include <linux/export.h>
#include <drm/drmP.h>
#include <drm/drm_edid.h>
+#include <drm/drm_atomic.h>
#include "drm_internal.h"
#if defined(CONFIG_DEBUG_FS)
@@ -163,6 +164,14 @@ int drm_debugfs_init(struct drm_minor *minor, int minor_id,
return ret;
}
+ if (drm_core_check_feature(dev, DRIVER_ATOMIC)) {
+ ret = drm_atomic_debugfs_init(minor);
+ if (ret) {
+ DRM_ERROR("Failed to create atomic debugfs files\n");
+ return ret;
+ }
+ }
+
if (dev->driver->debugfs_init) {
ret = dev->driver->debugfs_init(minor);
if (ret) {
diff --git a/include/drm/drm_atomic.h b/include/drm/drm_atomic.h
index 9701f2d..9e760f0 100644
--- a/include/drm/drm_atomic.h
+++ b/include/drm/drm_atomic.h
@@ -335,6 +335,13 @@ int __must_check drm_atomic_check_only(struct drm_atomic_state *state);
int __must_check drm_atomic_commit(struct drm_atomic_state *state);
int __must_check drm_atomic_nonblocking_commit(struct drm_atomic_state *state);
+void drm_state_dump(struct drm_device *dev, struct drm_printer *p);
+
+#ifdef CONFIG_DEBUG_FS
+struct drm_minor;
+int drm_atomic_debugfs_init(struct drm_minor *minor);
+#endif
+
#define for_each_connector_in_state(__state, connector, connector_state, __i) \
for ((__i) = 0; \
(__i) < (__state)->num_connector && \
--
2.7.4
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