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Message-ID: <3caa31c0-39bd-42e5-8e59-7ac7f197dcb7@amd.com>
Date: Tue, 15 Aug 2023 13:36:53 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: Hamza Mahfooz <hamza.mahfooz@....com>,
amd-gfx@...ts.freedesktop.org
Cc: Aurabindo Pillai <aurabindo.pillai@....com>,
stable@...r.kernel.org, Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Thomas Zimmermann <tzimmermann@...e.de>,
Javier Martinez Canillas <javierm@...hat.com>,
Srinivasan Shanmugam <srinivasan.shanmugam@....com>,
Guchun Chen <guchun.chen@....com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/amdgpu: register a dirty framebuffer callback for
fbcon
On 8/15/2023 12:26, Hamza Mahfooz wrote:
> fbcon requires that we implement &drm_framebuffer_funcs.dirty.
> Otherwise, the framebuffer might take a while to flush (which would
> manifest as noticeable lag). However, we can't enable this callback for
> non-fbcon cases since it might cause too many atomic commits to be made
> at once. So, implement amdgpu_dirtyfb() and only enable it for fbcon
> framebuffers on devices that support atomic KMS.
>
> Cc: Aurabindo Pillai <aurabindo.pillai@....com>
> Cc: Mario Limonciello <mario.limonciello@....com>
> Cc: stable@...r.kernel.org # 6.1+
This is safe specifically because other things like FB_DAMAGE_CLIPS have
come back to 6.1.y as well via f1edb2f58adb ("drm/amd/display: add
FB_DAMAGE_CLIPS support") and fixups to that.
> Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2519
> Signed-off-by: Hamza Mahfooz <hamza.mahfooz@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
> ---
> v2: update variable names
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 26 ++++++++++++++++++++-
> 1 file changed, 25 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> index d20dd3f852fc..d3b59f99cb7c 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
> @@ -38,6 +38,8 @@
> #include <linux/pci.h>
> #include <linux/pm_runtime.h>
> #include <drm/drm_crtc_helper.h>
> +#include <drm/drm_damage_helper.h>
> +#include <drm/drm_drv.h>
> #include <drm/drm_edid.h>
> #include <drm/drm_fb_helper.h>
> #include <drm/drm_gem_framebuffer_helper.h>
> @@ -532,11 +534,29 @@ bool amdgpu_display_ddc_probe(struct amdgpu_connector *amdgpu_connector,
> return true;
> }
>
> +static int amdgpu_dirtyfb(struct drm_framebuffer *fb, struct drm_file *file,
> + unsigned int flags, unsigned int color,
> + struct drm_clip_rect *clips, unsigned int num_clips)
> +{
> +
> + if (strcmp(fb->comm, "[fbcon]"))
> + return -ENOSYS;
> +
> + return drm_atomic_helper_dirtyfb(fb, file, flags, color, clips,
> + num_clips);
> +}
> +
> static const struct drm_framebuffer_funcs amdgpu_fb_funcs = {
> .destroy = drm_gem_fb_destroy,
> .create_handle = drm_gem_fb_create_handle,
> };
>
> +static const struct drm_framebuffer_funcs amdgpu_fb_funcs_atomic = {
> + .destroy = drm_gem_fb_destroy,
> + .create_handle = drm_gem_fb_create_handle,
> + .dirty = amdgpu_dirtyfb
> +};
> +
> uint32_t amdgpu_display_supported_domains(struct amdgpu_device *adev,
> uint64_t bo_flags)
> {
> @@ -1139,7 +1159,11 @@ static int amdgpu_display_gem_fb_verify_and_init(struct drm_device *dev,
> if (ret)
> goto err;
>
> - ret = drm_framebuffer_init(dev, &rfb->base, &amdgpu_fb_funcs);
> + if (drm_drv_uses_atomic_modeset(dev))
> + ret = drm_framebuffer_init(dev, &rfb->base,
> + &amdgpu_fb_funcs_atomic);
> + else
> + ret = drm_framebuffer_init(dev, &rfb->base, &amdgpu_fb_funcs);
>
> if (ret)
> goto err;
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