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drm/client: Make copies of modes

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drm_client_firmware_config() is currently picking up the current
mode of the crtc via the legacy crtc->mode, which is not supposed
to be used by atomic drivers at all. We can't simply switch over
to the proper crtc->state->mode because we drop the crtc->mutex
(which protects crtc->state) before the mode gets used.

The most straightforward solution to extend the lifetime of
modes[] seem to be to make full copies of the modes.

And with this we can undo also commit 3eadd887db
("drm/client:Fully protect modes[] with dev->mode_config.mutex")
as the lifetime of modes[] no longer has anything to do with
that lock.

v2: Don't try to copy NULL modes
v3: Keep storing pointers and use drm_mode_{duplicate,destroy}()

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250228211454.8138-5-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Ville Syrjälä 2025-02-28 23:14:50 +02:00
parent 7640a1c20f
commit 3039cc0c06
1 changed files with 47 additions and 15 deletions
Download patch file Download diff file Expand all files Collapse all files

62
drivers/gpu/drm/drm_client_modeset.c
View file

@ -265,6 +265,25 @@ static void drm_client_connectors_enabled(struct drm_connector *connectors[],
enabled[i] = drm_connector_enabled(connectors[i], false);
}
static void mode_replace(struct drm_device *dev,
const struct drm_display_mode **dst,
const struct drm_display_mode *src)
{
drm_mode_destroy(dev, (struct drm_display_mode *)*dst);
*dst = src ? drm_mode_duplicate(dev, src) : NULL;
}
static void modes_destroy(struct drm_device *dev,
const struct drm_display_mode *modes[],
int count)
{
int i;
for (i = 0; i < count; i++)
mode_replace(dev, &modes[i], NULL);
}
static bool drm_client_target_cloned(struct drm_device *dev,
struct drm_connector *connectors[],
unsigned int connector_count,
@ -296,7 +315,9 @@ static bool drm_client_target_cloned(struct drm_device *dev,
for (i = 0; i < connector_count; i++) {
if (!enabled[i])
continue;
modes[i] = drm_connector_pick_cmdline_mode(connectors[i]);
mode_replace(dev, &modes[i],
drm_connector_pick_cmdline_mode(connectors[i]));
if (!modes[i]) {
can_clone = false;
break;
@ -335,7 +356,7 @@ static bool drm_client_target_cloned(struct drm_device *dev,
DRM_MODE_MATCH_CLOCK |
DRM_MODE_MATCH_FLAGS |
DRM_MODE_MATCH_3D_FLAGS))
modes[i] = mode;
mode_replace(dev, &modes[i], mode);
}
if (!modes[i])
can_clone = false;
@ -445,16 +466,19 @@ retry:
}
mode_type = "cmdline";
modes[i] = drm_connector_pick_cmdline_mode(connector);
mode_replace(dev, &modes[i],
drm_connector_pick_cmdline_mode(connector));
if (!modes[i]) {
mode_type = "preferred";
modes[i] = drm_connector_preferred_mode(connector, width, height);
mode_replace(dev, &modes[i],
drm_connector_preferred_mode(connector, width, height));
}
if (!modes[i]) {
mode_type = "first";
modes[i] = drm_connector_first_mode(connector);
mode_replace(dev, &modes[i],
drm_connector_first_mode(connector));
}
/*
@ -472,10 +496,12 @@ retry:
connector->tile_v_loc == 0 &&
!drm_connector_get_tiled_mode(connector))) {
mode_type = "non tiled";
modes[i] = drm_connector_fallback_non_tiled_mode(connector);
mode_replace(dev, &modes[i],
drm_connector_fallback_non_tiled_mode(connector));
} else {
mode_type = "tiled";
modes[i] = drm_connector_get_tiled_mode(connector);
mode_replace(dev, &modes[i],
drm_connector_get_tiled_mode(connector));
}
}
@ -690,16 +716,19 @@ retry:
}
mode_type = "cmdline";
modes[i] = drm_connector_pick_cmdline_mode(connector);
mode_replace(dev, &modes[i],
drm_connector_pick_cmdline_mode(connector));
if (!modes[i]) {
mode_type = "preferred";
modes[i] = drm_connector_preferred_mode(connector, width, height);
mode_replace(dev, &modes[i],
drm_connector_preferred_mode(connector, width, height));
}
if (!modes[i]) {
mode_type = "first";
modes[i] = drm_connector_first_mode(connector);
mode_replace(dev, &modes[i],
drm_connector_first_mode(connector));
}
/* last resort: use current mode */
@ -716,7 +745,8 @@ retry:
* fastboot check to work correctly.
*/
mode_type = "current";
modes[i] = &connector->state->crtc->mode;
mode_replace(dev, &modes[i],
&connector->state->crtc->mode);
}
/*
@ -726,7 +756,8 @@ retry:
if (connector->has_tile &&
num_tiled_conns < connector->num_h_tile * connector->num_v_tile) {
mode_type = "non tiled";
modes[i] = drm_connector_fallback_non_tiled_mode(connector);
mode_replace(dev, &modes[i],
drm_connector_fallback_non_tiled_mode(connector));
}
crtcs[i] = new_crtc;
@ -798,7 +829,6 @@ int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width,
unsigned int total_modes_count = 0;
struct drm_client_offset *offsets;
unsigned int connector_count = 0;
/* points to modes protected by mode_config.mutex */
const struct drm_display_mode **modes;
struct drm_crtc **crtcs;
int i, ret = 0;
@ -850,7 +880,7 @@ int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width,
if (!drm_client_firmware_config(client, connectors, connector_count, crtcs,
modes, offsets, enabled, width, height)) {
memset(modes, 0, connector_count * sizeof(*modes));
modes_destroy(dev, modes, connector_count);
memset(crtcs, 0, connector_count * sizeof(*crtcs));
memset(offsets, 0, connector_count * sizeof(*offsets));
@ -867,6 +897,8 @@ int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width,
crtcs, modes, 0, width, height);
}
mutex_unlock(&dev->mode_config.mutex);
drm_client_modeset_release(client);
for (i = 0; i < connector_count; i++) {
@ -901,11 +933,11 @@ int drm_client_modeset_probe(struct drm_client_dev *client, unsigned int width,
modeset->y = offset->y;
}
}
mutex_unlock(&dev->mode_config.mutex);
mutex_unlock(&client->modeset_mutex);
out:
kfree(crtcs);
modes_destroy(dev, modes, connector_count);
kfree(modes);
kfree(offsets);
kfree(enabled);