On Wed, Jun 30, 2021 at 12:46:27PM +0000, Surendrakumar Upadhyay, TejaskumarX wrote:
-----Original Message----- From: Daniel Vetter daniel@ffwll.ch Sent: 30 June 2021 17:52 To: Surendrakumar Upadhyay, TejaskumarX tejaskumarx.surendrakumar.upadhyay@intel.com Cc: dri-devel@lists.freedesktop.org; intel-gfx@lists.freedesktop.org; chris@chris-wilson.co.uk Subject: Re: [Intel-gfx] [PATCH] drm/vgem: Use 256B aligned pitch
On Wed, Jun 30, 2021 at 05:32:15PM +0530, Tejas Upadhyay wrote:
Having different alignment requirement by different drivers, 256B aligned should work for all drm drivers.
What.
Like yes vgem abuses dumb_create, but it's not a kms driver. Pitch is meaningless, and that's why we align it minimally to 1 byte (bpp = bits per pixel here).
Maybe start with explaining what you're trying to do here. -Daniel
Igt tool tests which are trying to exercise tests through VGEM are getting failure (if not 64B aligned) on Intel platforms in creating framebuffer as they need them to be 64B aligned. Then 64B alignment is not A requirement for all drm drivers.
Fix the tests. We're not going to encode alignment constraints for all kms drivers in vgem, that's not what vgem is for.
Really what we should have done is just give vgem an ioctl to allocate a buffer, with the size specified in bytes. Not this "abuse dumb_create" business we're doing. But that's a past mistake, can't really fix that. -Daniel
Thanks, Tejas
Signed-off-by: Tejas Upadhyay
tejaskumarx.surendrakumar.upadhyay@intel.com
drivers/gpu/drm/vgem/vgem_drv.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/vgem/vgem_drv.c b/drivers/gpu/drm/vgem/vgem_drv.c index bf38a7e319d1..1da6df5e256a 100644 --- a/drivers/gpu/drm/vgem/vgem_drv.c +++ b/drivers/gpu/drm/vgem/vgem_drv.c @@ -215,7 +215,7 @@ static int vgem_gem_dumb_create(struct drm_file
*file, struct drm_device *dev,
struct drm_gem_object *gem_object; u64 pitch, size;
- pitch = args->width * DIV_ROUND_UP(args->bpp, 8);
- pitch = ALIGN(args->width * DIV_ROUND_UP(args->bpp, 8), 256); size = args->height * pitch; if (size == 0) return -EINVAL;
-- 2.31.1
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-- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch