From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Date: Wed, 20 Apr 2016 17:44:14 +0000 Subject: Re: [PATCH 5/8] fbdev: fb_defio: Export fb_deferred_io_mmap Message-Id: <20160420174414.GQ2510@phenom.ffwll.local> List-Id: References: <1461165929-11344-1-git-send-email-noralf@tronnes.org> <1461165929-11344-6-git-send-email-noralf@tronnes.org> In-Reply-To: <1461165929-11344-6-git-send-email-noralf@tronnes.org> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: Noralf =?iso-8859-1?Q?Tr=F8nnes?= Cc: linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, tomi.valkeinen@ti.com, laurent.pinchart@ideasonboard.com On Wed, Apr 20, 2016 at 05:25:26PM +0200, Noralf Tr=F8nnes wrote: > Export fb_deferred_io_mmap so drivers can change vma->vm_page_prot. > When the framebuffer memory is allocated using dma_alloc_writecombine() > instead of vmalloc(), I get cache syncing problems. > This solves it: >=20 > static int drm_fbdev_cma_deferred_io_mmap(struct fb_info *info, > struct vm_area_struct *vma) > { > fb_deferred_io_mmap(info, vma); > vma->vm_page_prot =3D pgprot_writecombine(vma->vm_page_prot); Hm, do we need pgpropt_writecombine? There recently was some discussion (on the arc platform) that fbdev pgprots need to be fixed up in fbdev code. I have no idea, just repeating from memory ... -Daniel >=20 > return 0; > } >=20 > Signed-off-by: Noralf Tr=F8nnes > --- > drivers/video/fbdev/core/fb_defio.c | 3 ++- > include/linux/fb.h | 1 + > 2 files changed, 3 insertions(+), 1 deletion(-) >=20 > diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/co= re/fb_defio.c > index 57721c7..74b5bca 100644 > --- a/drivers/video/fbdev/core/fb_defio.c > +++ b/drivers/video/fbdev/core/fb_defio.c > @@ -164,7 +164,7 @@ static const struct address_space_operations fb_defer= red_io_aops =3D { > .set_page_dirty =3D fb_deferred_io_set_page_dirty, > }; > =20 > -static int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_stru= ct *vma) > +int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma) > { > vma->vm_ops =3D &fb_deferred_io_vm_ops; > vma->vm_flags |=3D VM_DONTEXPAND | VM_DONTDUMP; > @@ -173,6 +173,7 @@ static int fb_deferred_io_mmap(struct fb_info *info, = struct vm_area_struct *vma) > vma->vm_private_data =3D info; > return 0; > } > +EXPORT_SYMBOL(fb_deferred_io_mmap); > =20 > /* workqueue callback */ > static void fb_deferred_io_work(struct work_struct *work) > diff --git a/include/linux/fb.h b/include/linux/fb.h > index dfe8835..a964d07 100644 > --- a/include/linux/fb.h > +++ b/include/linux/fb.h > @@ -673,6 +673,7 @@ static inline void __fb_pad_aligned_buffer(u8 *dst, u= 32 d_pitch, > } > =20 > /* drivers/video/fb_defio.c */ > +int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma= ); > extern void fb_deferred_io_init(struct fb_info *info); > extern void fb_deferred_io_open(struct fb_info *info, > struct inode *inode, > --=20 > 2.2.2 >=20 --=20 Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch