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Piccoli" , bluescreen_avenger@verizon.net, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Jocelyn Falempe Subject: [PATCH v2 4/5] drm/log: Do not draw if drm_master is taken Date: Fri, 16 Aug 2024 14:52:36 +0200 Message-ID: <20240816125612.1003295-5-jfalempe@redhat.com> In-Reply-To: <20240816125612.1003295-1-jfalempe@redhat.com> References: <20240816125612.1003295-1-jfalempe@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 Content-Type: text/plain; charset="utf-8" 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 --- drivers/gpu/drm/drm_log.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/drm_log.c b/drivers/gpu/drm/drm_log.c index 0739a4c72bb7..b94ce3ea48a0 100644 --- a/drivers/gpu/drm/drm_log.c +++ b/drivers/gpu/drm/drm_log.c @@ -22,6 +22,7 @@ =20 #include "drm_draw.h" #include "drm_log.h" +#include "drm_internal.h" =20 MODULE_AUTHOR("Jocelyn Falempe"); MODULE_DESCRIPTION("DRM boot logger"); @@ -361,10 +362,15 @@ static bool drm_log_active_output(void) bool active =3D false; =20 mutex_lock(&drm_log_lock); - list_for_each_entry(dclient, &drm_log_clients, head) - if (dclient->n_scanout || !dclient->probed) - active =3D true; - + list_for_each_entry(dclient, &drm_log_clients, head) { + if (dclient->n_scanout || !dclient->probed) { + /* Also check that we are still the master */ + if (drm_master_internal_acquire(dclient->client.dev)) { + drm_master_internal_release(dclient->client.dev); + active =3D true; + } + } + } mutex_unlock(&drm_log_lock); return active; } --=20 2.46.0