add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/gpu/drm/drm_crtc.c
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@@ -34,7 +34,7 @@
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 #include <linux/slab.h>
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 #include <linux/export.h>
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 #include <linux/dma-fence.h>
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-#include <drm/drmP.h>
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+#include <linux/uaccess.h>
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 #include <drm/drm_crtc.h>
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 #include <drm/drm_edid.h>
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 #include <drm/drm_fourcc.h>
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@@ -42,6 +42,9 @@
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 #include <drm/drm_atomic.h>
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 #include <drm/drm_auth.h>
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 #include <drm/drm_debugfs_crc.h>
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+#include <drm/drm_drv.h>
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+#include <drm/drm_print.h>
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+#include <drm/drm_file.h>
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 #include "drm_crtc_internal.h"
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 #include "drm_internal.h"
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@@ -90,15 +93,6 @@
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 }
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 EXPORT_SYMBOL(drm_crtc_from_index);
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-/**
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- * drm_crtc_force_disable - Forcibly turn off a CRTC
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- * @crtc: CRTC to turn off
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- *
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- * Note: This should only be used by non-atomic legacy drivers.
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- *
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- * Returns:
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- * Zero on success, error code on failure.
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- */
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 int drm_crtc_force_disable(struct drm_crtc *crtc)
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 {
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 	struct drm_mode_set set = {
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@@ -109,38 +103,6 @@
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 	return drm_mode_set_config_internal(&set);
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 }
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-EXPORT_SYMBOL(drm_crtc_force_disable);
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-
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-/**
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- * drm_crtc_force_disable_all - Forcibly turn off all enabled CRTCs
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- * @dev: DRM device whose CRTCs to turn off
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- *
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- * Drivers may want to call this on unload to ensure that all displays are
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- * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
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- *
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- * Note: This should only be used by non-atomic legacy drivers. For an atomic
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- * version look at drm_atomic_helper_shutdown().
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- *
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- * Returns:
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- * Zero on success, error code on failure.
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- */
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-int drm_crtc_force_disable_all(struct drm_device *dev)
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-{
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-	struct drm_crtc *crtc;
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-	int ret = 0;
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-
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-	drm_modeset_lock_all(dev);
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-	drm_for_each_crtc(crtc, dev)
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-		if (crtc->enabled) {
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-			ret = drm_crtc_force_disable(crtc);
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-			if (ret)
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-				goto out;
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-		}
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-out:
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-	drm_modeset_unlock_all(dev);
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-	return ret;
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-}
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-EXPORT_SYMBOL(drm_crtc_force_disable_all);
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 static unsigned int drm_num_crtcs(struct drm_device *dev)
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 {
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@@ -160,9 +122,7 @@
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 	int ret = 0;
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123
 
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 	drm_for_each_crtc(crtc, dev) {
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-		if (drm_debugfs_crtc_add(crtc))
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-			DRM_ERROR("Failed to initialize debugfs entry for CRTC '%s'.\n",
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-				  crtc->name);
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+		drm_debugfs_crtc_add(crtc);
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 		if (crtc->funcs->late_register)
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 			ret = crtc->funcs->late_register(crtc);
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@@ -243,6 +203,33 @@
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 	return fence;
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 }
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+
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+/**
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+ * DOC: standard CRTC properties
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+ *
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+ * DRM CRTCs have a few standardized properties:
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+ *
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+ * ACTIVE:
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+ * 	Atomic property for setting the power state of the CRTC. When set to 1
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+ * 	the CRTC will actively display content. When set to 0 the CRTC will be
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+ * 	powered off. There is no expectation that user-space will reset CRTC
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+ * 	resources like the mode and planes when setting ACTIVE to 0.
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+ *
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+ * 	User-space can rely on an ACTIVE change to 1 to never fail an atomic
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+ * 	test as long as no other property has changed. If a change to ACTIVE
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+ * 	fails an atomic test, this is a driver bug. For this reason setting
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+ * 	ACTIVE to 0 must not release internal resources (like reserved memory
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+ * 	bandwidth or clock generators).
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+ *
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+ * 	Note that the legacy DPMS property on connectors is internally routed
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+ * 	to control this property for atomic drivers.
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+ * MODE_ID:
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+ * 	Atomic property for setting the CRTC display timings. The value is the
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+ * 	ID of a blob containing the DRM mode info. To disable the CRTC,
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+ * 	user-space must set this property to 0.
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+ *
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+ * 	Setting MODE_ID to 0 will release reserved resources for the CRTC.
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+ */
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 /**
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  * drm_crtc_init_with_planes - Initialise a new CRTC object with
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@@ -337,6 +324,8 @@
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 		drm_object_attach_property(&crtc->base, config->prop_mode_id, 0);
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 		drm_object_attach_property(&crtc->base,
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 					   config->prop_out_fence_ptr, 0);
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+		drm_object_attach_property(&crtc->base,
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+					   config->prop_vrr_enabled, 0);
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 	}
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 	return 0;
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@@ -402,7 +391,7 @@
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 	struct drm_plane *plane;
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 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
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-		return -EINVAL;
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+		return -EOPNOTSUPP;
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 	crtc = drm_crtc_find(dev, file_priv, crtc_resp->crtc_id);
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 	if (!crtc)
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@@ -567,9 +556,9 @@
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 	struct drm_mode_crtc *crtc_req = data;
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 	struct drm_crtc *crtc;
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 	struct drm_plane *plane;
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-	struct drm_connector **connector_set, *connector;
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-	struct drm_framebuffer *fb;
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-	struct drm_display_mode *mode;
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+	struct drm_connector **connector_set = NULL, *connector;
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+	struct drm_framebuffer *fb = NULL;
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+	struct drm_display_mode *mode = NULL;
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 	struct drm_mode_set set;
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 	uint32_t __user *set_connectors_ptr;
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 	struct drm_modeset_acquire_ctx ctx;
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@@ -577,7 +566,7 @@
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 	int i;
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 	if (!drm_core_check_feature(dev, DRIVER_MODESET))
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-		return -EINVAL;
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+		return -EOPNOTSUPP;
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 	/*
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 	 * Universal plane src offsets are only 16.16, prevent havoc for
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@@ -599,16 +588,8 @@
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 	if (crtc_req->mode_valid && !drm_lease_held(file_priv, plane->base.id))
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 		return -EACCES;
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-	mutex_lock(&crtc->dev->mode_config.mutex);
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-	drm_modeset_acquire_init(&ctx, DRM_MODESET_ACQUIRE_INTERRUPTIBLE);
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-retry:
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-	connector_set = NULL;
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-	fb = NULL;
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-	mode = NULL;
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-
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-	ret = drm_modeset_lock_all_ctx(crtc->dev, &ctx);
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-	if (ret)
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-		goto out;
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+	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx,
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+				   DRM_MODESET_ACQUIRE_INTERRUPTIBLE, ret);
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 	if (crtc_req->mode_valid) {
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 		/* If we have a mode we need a framebuffer. */
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@@ -674,6 +655,7 @@
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 							   fb->modifier);
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 			if (ret) {
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 				struct drm_format_name_buf format_name;
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+
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 				DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
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 					      drm_get_format_name(fb->format->format,
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 								  &format_name),
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@@ -767,14 +749,13 @@
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 	}
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 	kfree(connector_set);
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 	drm_mode_destroy(dev, mode);
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-	if (ret == -EDEADLK) {
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-		ret = drm_modeset_backoff(&ctx);
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-		if (!ret)
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-			goto retry;
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-	}
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-	drm_modeset_drop_locks(&ctx);
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-	drm_modeset_acquire_fini(&ctx);
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-	mutex_unlock(&crtc->dev->mode_config.mutex);
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+
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+	/* In case we need to retry... */
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+	connector_set = NULL;
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+	fb = NULL;
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+	mode = NULL;
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+
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+	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
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 	return ret;
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 }