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drm/log: Do not draw if drm_master is taken

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When userspace takes drm_master, the drm_client buffer is no more
visible, so drm_log shouldn't waste CPU cycle to draw on it.

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20241204160014.1171469-4-jfalempe@redhat.com
This commit is contained in:
Jocelyn Falempe 2024-12-04 16:45:02 +01:00
parent f7b42442c4
commit eb30b4453e
1 changed files with 8 additions and 2 deletions
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10
drivers/gpu/drm/clients/drm_log.c
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@ -19,6 +19,7 @@
#include "drm_client_internal.h"
#include "drm_draw_internal.h"
#include "drm_internal.h"
MODULE_AUTHOR("Jocelyn Falempe");
MODULE_DESCRIPTION("DRM boot logger");
@ -308,8 +309,13 @@ static void drm_log_write_thread(struct console *con, struct nbcon_write_context
if (!dlog->probed)
drm_log_init_client(dlog);
for (i = 0; i < dlog->n_scanout; i++)
drm_log_draw_kmsg_record(&dlog->scanout[i], wctxt->outbuf, wctxt->len);
/* Check that we are still the master before drawing */
if (drm_master_internal_acquire(dlog->client.dev)) {
drm_master_internal_release(dlog->client.dev);
for (i = 0; i < dlog->n_scanout; i++)
drm_log_draw_kmsg_record(&dlog->scanout[i], wctxt->outbuf, wctxt->len);
}
}
static void drm_log_lock(struct console *con, unsigned long *flags)