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Message-ID: <559b81a3-c4a5-9e18-57bd-e5af74db99c8@quicinc.com>
Date: Fri, 30 Jun 2023 10:59:12 -0700
From: Jessica Zhang <quic_jesszhan@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>,
Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
Marijn Suijten <marijn.suijten@...ainline.org>
CC: <quic_abhinavk@...cinc.com>, <ppaalanen@...il.com>,
<contact@...rsion.fr>, <laurent.pinchart@...asonboard.com>,
<sebastian.wick@...hat.com>, <ville.syrjala@...ux.intel.com>,
<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-msm@...r.kernel.org>, <freedreno@...ts.freedesktop.org>,
<wayland-devel@...ts.freedesktop.org>
Subject: Re: [PATCH RFC v4 3/7] drm/atomic: Move framebuffer checks to helper
On 6/29/2023 5:43 PM, Dmitry Baryshkov wrote:
> On 30/06/2023 03:25, Jessica Zhang wrote:
>> Currently framebuffer checks happen directly in
>> drm_atomic_plane_check(). Move these checks into their own helper
>> method.
>>
>> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
>> ---
>> drivers/gpu/drm/drm_atomic.c | 130
>> ++++++++++++++++++++++++-------------------
>> 1 file changed, 74 insertions(+), 56 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
>> index b4c6ffc438da..404b984d2d9f 100644
>> --- a/drivers/gpu/drm/drm_atomic.c
>> +++ b/drivers/gpu/drm/drm_atomic.c
>> @@ -580,6 +580,76 @@ plane_switching_crtc(const struct drm_plane_state
>> *old_plane_state,
>> return true;
>> }
>> +static int drm_atomic_check_fb(const struct drm_plane_state *state)
>> +{
>> + struct drm_plane *plane = state->plane;
>> + const struct drm_framebuffer *fb = state->fb;
>> + struct drm_mode_rect *clips;
>> +
>> + uint32_t num_clips;
>> + unsigned int fb_width, fb_height;
>> + int ret;
>> +
>> + /* Check whether this plane supports the fb pixel format. */
>> + ret = drm_plane_check_pixel_format(plane, fb->format->format,
>> + fb->modifier);
>> +
>> + if (ret) {
>> + drm_dbg_atomic(plane->dev,
>> + "[PLANE:%d:%s] invalid pixel format %p4cc,
>> modifier 0x%llx\n",
>> + plane->base.id, plane->name,
>> + &fb->format->format, fb->modifier);
>> + return ret;
>> + }
>> +
>> + fb_width = fb->width << 16;
>> + fb_height = fb->height << 16;
>> +
>> + /* Make sure source coordinates are inside the fb. */
>> + if (state->src_w > fb_width ||
>> + state->src_x > fb_width - state->src_w ||
>> + state->src_h > fb_height ||
>> + state->src_y > fb_height - state->src_h) {
>> + drm_dbg_atomic(plane->dev,
>> + "[PLANE:%d:%s] invalid source coordinates "
>> + "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
>> + plane->base.id, plane->name,
>> + state->src_w >> 16,
>> + ((state->src_w & 0xffff) * 15625) >> 10,
>> + state->src_h >> 16,
>> + ((state->src_h & 0xffff) * 15625) >> 10,
>> + state->src_x >> 16,
>> + ((state->src_x & 0xffff) * 15625) >> 10,
>> + state->src_y >> 16,
>> + ((state->src_y & 0xffff) * 15625) >> 10,
>> + fb->width, fb->height);
>> + return -ENOSPC;
>> + }
>> +
>> + clips = __drm_plane_get_damage_clips(state);
>> + num_clips = drm_plane_get_damage_clips_count(state);
>> +
>> + /* Make sure damage clips are valid and inside the fb. */
>> + while (num_clips > 0) {
>> + if (clips->x1 >= clips->x2 ||
>> + clips->y1 >= clips->y2 ||
>> + clips->x1 < 0 ||
>> + clips->y1 < 0 ||
>> + clips->x2 > fb_width ||
>> + clips->y2 > fb_height) {
>> + drm_dbg_atomic(plane->dev,
>> + "[PLANE:%d:%s] invalid damage clip %d %d %d
>> %d\n",
>> + plane->base.id, plane->name, clips->x1,
>> + clips->y1, clips->x2, clips->y2);
>> + return -EINVAL;
>> + }
>> + clips++;
>> + num_clips--;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> /**
>> * drm_atomic_plane_check - check plane state
>> * @old_plane_state: old plane state to check
>> @@ -596,9 +666,6 @@ static int drm_atomic_plane_check(const struct
>> drm_plane_state *old_plane_state,
>> struct drm_plane *plane = new_plane_state->plane;
>> struct drm_crtc *crtc = new_plane_state->crtc;
>> const struct drm_framebuffer *fb = new_plane_state->fb;
>> - unsigned int fb_width, fb_height;
>> - struct drm_mode_rect *clips;
>> - uint32_t num_clips;
>> int ret;
>> /* either *both* CRTC and FB must be set, or neither */
>> @@ -625,17 +692,6 @@ static int drm_atomic_plane_check(const struct
>> drm_plane_state *old_plane_state,
>> return -EINVAL;
>> }
>> - /* Check whether this plane supports the fb pixel format. */
>> - ret = drm_plane_check_pixel_format(plane, fb->format->format,
>> - fb->modifier);
>> - if (ret) {
>> - drm_dbg_atomic(plane->dev,
>> - "[PLANE:%d:%s] invalid pixel format %p4cc,
>> modifier 0x%llx\n",
>> - plane->base.id, plane->name,
>> - &fb->format->format, fb->modifier);
>> - return ret;
>> - }
>> -
>> /* Give drivers some help against integer overflows */
>> if (new_plane_state->crtc_w > INT_MAX ||
>> new_plane_state->crtc_x > INT_MAX - (int32_t)
>> new_plane_state->crtc_w ||
>> @@ -649,49 +705,11 @@ static int drm_atomic_plane_check(const struct
>> drm_plane_state *old_plane_state,
>> return -ERANGE;
>> }
>> - fb_width = fb->width << 16;
>> - fb_height = fb->height << 16;
>> - /* Make sure source coordinates are inside the fb. */
>> - if (new_plane_state->src_w > fb_width ||
>> - new_plane_state->src_x > fb_width - new_plane_state->src_w ||
>> - new_plane_state->src_h > fb_height ||
>> - new_plane_state->src_y > fb_height - new_plane_state->src_h) {
>> - drm_dbg_atomic(plane->dev,
>> - "[PLANE:%d:%s] invalid source coordinates "
>> - "%u.%06ux%u.%06u+%u.%06u+%u.%06u (fb %ux%u)\n",
>> - plane->base.id, plane->name,
>> - new_plane_state->src_w >> 16,
>> - ((new_plane_state->src_w & 0xffff) * 15625) >> 10,
>> - new_plane_state->src_h >> 16,
>> - ((new_plane_state->src_h & 0xffff) * 15625) >> 10,
>> - new_plane_state->src_x >> 16,
>> - ((new_plane_state->src_x & 0xffff) * 15625) >> 10,
>> - new_plane_state->src_y >> 16,
>> - ((new_plane_state->src_y & 0xffff) * 15625) >> 10,
>> - fb->width, fb->height);
>> - return -ENOSPC;
>> - }
>> -
>> - clips = __drm_plane_get_damage_clips(new_plane_state);
>> - num_clips = drm_plane_get_damage_clips_count(new_plane_state);
>> -
>> - /* Make sure damage clips are valid and inside the fb. */
>> - while (num_clips > 0) {
>> - if (clips->x1 >= clips->x2 ||
>> - clips->y1 >= clips->y2 ||
>> - clips->x1 < 0 ||
>> - clips->y1 < 0 ||
>> - clips->x2 > fb_width ||
>> - clips->y2 > fb_height) {
>> - drm_dbg_atomic(plane->dev,
>> - "[PLANE:%d:%s] invalid damage clip %d %d %d
>> %d\n",
>> - plane->base.id, plane->name, clips->x1,
>> - clips->y1, clips->x2, clips->y2);
>> - return -EINVAL;
>> - }
>> - clips++;
>> - num_clips--;
>> + if (fb) {
>
> This doesn't only move code, but also changes semantics, making the
> checks optional if no FB is provided. Consider moving the condition to
> the next patch. Otherwise LGTM.
Hi Dmitry,
Sounds good.
Thanks,
Jessica Zhang
>
>> + ret = drm_atomic_check_fb(new_plane_state);
>> + if (ret)
>> + return ret;
>> }
>> if (plane_switching_crtc(old_plane_state, new_plane_state)) {
>>
>
> --
> With best wishes
> Dmitry
>
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