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Wed, 05 Mar 2025 07:26:32 -0800 (PST) X-Google-Smtp-Source: AGHT+IE1AgdJworx0wc6ga7cTSTBOuDEcumamKctgiwANw8/Rb3cfxQmtMLlo6lyVJUiuFftqJ0LQA== X-Received: by 2002:a05:6a00:9a0:b0:736:38b1:51c3 with SMTP id d2e1a72fcca58-7366e75b316mr13315865b3a.10.1741188392100; Wed, 05 Mar 2025 07:26:32 -0800 (PST) Received: from zeus.elecom ([240b:10:83a2:bd00:6e35:f2f5:2e21:ae3a]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7364b4eff66sm6983292b3a.83.2025.03.05.07.26.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 05 Mar 2025 07:26:31 -0800 (PST) From: Ryosuke Yasuoka To: maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, simona@ffwll.ch, kraxel@redhat.com, gurchetansingh@chromium.org, olvaffe@gmail.com, akpm@linux-foundation.org, urezki@gmail.com, hch@infradead.org, dmitry.osipenko@collabora.com, jfalempe@redhat.com Cc: Ryosuke Yasuoka , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, virtualization@lists.linux.dev, linux-mm@kvack.org Subject: [PATCH drm-next 0/2] Enhance drm_panic Support for Virtio-GPU Date: Thu, 6 Mar 2025 00:25:52 +0900 Message-ID: <20250305152555.318159-1-ryasuoka@redhat.com> X-Mailer: git-send-email 2.48.1 Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: mu_yJ39ktI1N4kewz5krFTAsDpDJeTuJmcas3VtStwY_1741188392 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true Hi This patch series proposes enhancement for drm_panic. While virtio-gpu currently supports drm_panic [1], it is limited to vmapped shmem BOs. IOW, it does not work in non-VT FB environments, such as GUI desktops. This limitation arises because shmem BOs require vmap, which cannot be used in a panic handler since vmap is sleepable and takes locks. To address this, drm_panic needs an atomic variant of vmap. The first patch (1/2) introduces atomic_vmap, and the second patch (2/2) updates the existing virtio drm_panic implementation to use the atomic_vmap. I've tested these changes in both Gnome and VT environments, and they work correctly. Best regards, Ryosuke [1] https://patchwork.freedesktop.org/patch/635658/ Ryosuke Yasuoka (2): vmalloc: Add atomic_vmap drm/virtio: Use atomic_vmap to work drm_panic in GUI drivers/gpu/drm/drm_gem.c | 51 ++++++++++++ drivers/gpu/drm/drm_gem_shmem_helper.c | 51 ++++++++++++ drivers/gpu/drm/virtio/virtgpu_plane.c | 14 +++- include/drm/drm_gem.h | 1 + include/drm/drm_gem_shmem_helper.h | 2 + include/linux/vmalloc.h | 2 + mm/internal.h | 5 ++ mm/vmalloc.c | 105 +++++++++++++++++++++++++ 8 files changed, 228 insertions(+), 3 deletions(-) base-commit: e21cba704714c301d04c5fd37a693734b623872a -- 2.48.1