Reviving this thread from the context of the below conversion:
https://lore.kernel.org/linux-arm-msm/db26145b-3f64-a334-f698-76f972332881@xxxxxxxxxxxx/T/#u
On 2018-10-05 01:19, Neil Armstrong wrote:
On 05/10/2018 09:58, Daniel Vetter wrote:
On Fri, Oct 5, 2018 at 9:39 AM Neil Armstrong
<narmstrong@xxxxxxxxxxxx> wrote:
[...]
OK, won't this be enough ?
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -333,6 +333,8 @@ struct drm_mode_config_funcs {
* @min_height: minimum fb pixel height on this device
* @max_width: maximum fb pixel width on this device
* @max_height: maximum fb pixel height on this device
+ * @max_fb_width: maximum fb buffer width if differs from max_width
+ * @max_fb_height: maximum fb buffer height if differs from
max_height
* @funcs: core driver provided mode setting functions
* @fb_base: base address of the framebuffer
* @poll_enabled: track polling support for this device
@@ -508,6 +510,7 @@ struct drm_mode_config {
int min_width, min_height;
int max_width, max_height;
+ int max_fb_width, max_fb_height;
const struct drm_mode_config_funcs *funcs;
resource_size_t fb_base;
--- a/drivers/gpu/drm/drm_framebuffer.c
+++ b/drivers/gpu/drm/drm_framebuffer.c
@@ -283,14 +283,20 @@ drm_internal_framebuffer_create(struct
drm_device *dev,
return ERR_PTR(-EINVAL);
}
- if ((config->min_width > r->width) || (r->width >
config->max_width)) {
+ if ((config->min_width > r->width) ||
+ (!config->max_fb_width && r->width > config->max_width)
||
+ (config->max_fb_width && r->width >
config->max_fb_width)) {
DRM_DEBUG_KMS("bad framebuffer width %d, should be >=
%d && <= %d\n",
- r->width, config->min_width,
config->max_width);
+ r->width, config->min_width,
config->max_fb_width ?
+ config->max_fb_width : config->max_width);
return ERR_PTR(-EINVAL);
}
- if ((config->min_height > r->height) || (r->height >
config->max_height)) {
+ if ((config->min_height > r->height) ||
+ (!config->max_fb_height && r->height >
config->max_height) ||
+ (config->max_fb_height && r->height >
config->max_fb_height)) {
DRM_DEBUG_KMS("bad framebuffer height %d, should be
>= %d && <= %d\n",
- r->height, config->min_height,
config->max_height);
+ r->height, config->min_height,
config->max_fb_height ?
+ config->max_fb_height :
config->max_height);
return ERR_PTR(-EINVAL);
}
and in the driver :
+ drm->mode_config.max_width = 4096;
+ drm->mode_config.max_height = 3840;
+ drm->mode_config.max_fb_width = 16384;
+ drm->mode_config.max_fb_height = 8192;
With this I leave the mode filtering intact.
Not enough. See
https://dri.freedesktop.org/docs/drm/gpu/drm-kms-helpers.html#c.drm_connector_helper_funcs
and scroll down to mode_valid. You need to filter modes both in the
detect paths, and the atomic_check paths.
Detect is explicitly filtered out, but atomic_check was only
implicitly filtered, through the max fb size checks. Ok, you could
light up a mode that's bigger than max fb, but in practice, no
userspace ever did that.
Daniel, MSM and few other vendor hardware have upscale blocks where the
driver can expose fb sizes smaller than
the mode resolution and use h/w upscaling to fill the screen. This would
optimize the fetch bandwidth.
But with your code we're missing crucial
validation now, and userspace could fall over that. What I think we
need is to add mode filter against mode_config.max_width/height in
drm_atomic_helper_check_modeset(). Probably best to stuff that into
the mode_valid() function.
Agreed! Since the above patch from Niel is taking care of cases where
max/min fb values
are not set, by checking against the original max/min values, can we
separate out this
core change from the driver level mode_valid changes? If Niel couldn't
find the time, I can
repost the above change.
Thanks and Regards,
Jeykumar S.
Ok I understood now, thanks for pointer, I'll try to add this.
Neil
Cheers, Daniel
Neil
-Daniel
Neil
Bunch of igt to make sure we're not missing anything would be
sweet on
top, e.g. e.g. trying to set a mode over the limit and making sure
it
fails.
Cheers, Daniel
---
drivers/gpu/drm/meson/meson_drv.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/meson/meson_drv.c
b/drivers/gpu/drm/meson/meson_drv.c
index d344312..2e29968 100644
--- a/drivers/gpu/drm/meson/meson_drv.c
+++ b/drivers/gpu/drm/meson/meson_drv.c
@@ -243,8 +243,8 @@ static int meson_drv_bind_master(struct
device *dev, bool has_components)
goto free_drm;
drm_mode_config_init(drm);
- drm->mode_config.max_width = 3840;
- drm->mode_config.max_height = 2160;
+ drm->mode_config.max_width = 16384;
+ drm->mode_config.max_height = 8192;
drm->mode_config.funcs = &meson_mode_config_funcs;
/* Hardware Initialization */
--
2.7.4
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--
Jeykumar S
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