linux-kernel - [PATCH RFC drm-misc-next v2 0/1] Add support for drm

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Message-ID: <20250526090117.80593-1-ryasuoka@redhat.com>
Date: Mon, 26 May 2025 18:01:04 +0900
From: Ryosuke Yasuoka <ryasuoka@...hat.com>
To: drawat.floss@...il.com,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	jfalempe@...hat.com
Cc: Ryosuke Yasuoka <ryasuoka@...hat.com>,
	linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH RFC drm-misc-next v2 0/1] Add support for drm_panic

This patch adds drm_panic support for hyperv-drm driver. This function
works but it's still needed to brush up. Let me hear your opinions.

Once kernel panic occurs we expect to see a panic screen. However, to
see the screen, I need to close/re-open the graphic console client
window. As the panic screen shows correctly in the small preview
window in Hyper-V manager and debugfs API for drm_panic works correctly,
I think kernel needs to send signal to Hyper-V host that the console
client refreshes, but I have no idea what kind of signal is needed.

This patch is tested on Hyper-V 2022.

v2:
- Re-write codes with regular atomic helper. The driver was implemented
  with simple KMS. So replace it with regular atomic helper in [1],
  implement this feature on it.

[1] https://lore.kernel.org/all/20250427101825.812766-1-ryasuoka@redhat.com/

v1:
https://lore.kernel.org/lkml/20250402084351.1545536-1-ryasuoka@redhat.com/

Ryosuke Yasuoka (1):
  drm/hyperv: Add support for drm_panic

 drivers/gpu/drm/hyperv/hyperv_drm_modeset.c | 36 +++++++++++++++++++++
 1 file changed, 36 insertions(+)

base-commit: c06cb85ad1412c6ff34792b028b2f89495761398
-- 
2.49.0