Re: [PATCH] dma-buf: add support for compat ioctl
Hi Marek, On 23 February 2017 at 00:37, Daniel Vetter wrote: > On Tue, Feb 21, 2017 at 4:08 PM, Christian König > wrote: >> Am 21.02.2017 um 15:55 schrieb Marek Szyprowski: >>> >>> Dear All, >>> >>> On 2017-02-21 15:37, Marek Szyprowski wrote: Hi Christian, On 2017-02-21 14:59, Christian König wrote: > > Am 21.02.2017 um 14:21 schrieb Marek Szyprowski: >> >> Add compat ioctl support to dma-buf. This lets one to use >> DMA_BUF_IOCTL_SYNC >> ioctl from 32bit application on 64bit kernel. Data structures for both >> 32 >> and 64bit modes are same, so there is no need for additional >> translation >> layer. > > > Well I might be wrong, but IIRC compat_ioctl was just optional and if > not specified unlocked_ioctl was called instead. > > If that is true your patch wouldn't have any effect at all. Well, then why I got -ENOTTY in the 32bit test app for this ioctl on 64bit ARM64 kernel without this patch? >>> >>> I've checked in fs/compat_ioctl.c, I see no fallback in >>> COMPAT_SYSCALL_DEFINE3, >>> so one has to provide compat_ioctl callback to have ioctl working with >>> 32bit >>> apps. >> >> >> Then my memory cheated on me. >> >> In this case the patch is Reviewed-by: Christian König >> . > Thanks much for spotting this! > Since you have commit rights for drm-misc, care to push this to > drm-misc-next-fixes pls? Also I think this warrants a cc: stable, > clearly an obvious screw-up in creating this api on our side :( So > feel free to smash my ack on the patch. > Daniel, Christian, I saw this just now, so if Christian hasn't already pulled it into drm-misc-next-fixes, I'll give it a stab. > Thanks, Daniel > -- > Daniel Vetter > Software Engineer, Intel Corporation > +41 (0) 79 365 57 48 - http://blog.ffwll.ch > ___ > dri-devel mailing list > dri-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel Best, Sumit. -- Thanks and regards, Sumit Semwal Linaro Mobile Group - Kernel Team Lead Linaro.org │ Open source software for ARM SoCs ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: [PATCH] dma-buf: add support for compat ioctl
On Tue, Feb 21, 2017 at 4:08 PM, Christian König wrote: > Am 21.02.2017 um 15:55 schrieb Marek Szyprowski: >> >> Dear All, >> >> On 2017-02-21 15:37, Marek Szyprowski wrote: >>> >>> Hi Christian, >>> >>> On 2017-02-21 14:59, Christian König wrote: Am 21.02.2017 um 14:21 schrieb Marek Szyprowski: > > Add compat ioctl support to dma-buf. This lets one to use > DMA_BUF_IOCTL_SYNC > ioctl from 32bit application on 64bit kernel. Data structures for both > 32 > and 64bit modes are same, so there is no need for additional > translation > layer. Well I might be wrong, but IIRC compat_ioctl was just optional and if not specified unlocked_ioctl was called instead. If that is true your patch wouldn't have any effect at all. >>> >>> >>> Well, then why I got -ENOTTY in the 32bit test app for this ioctl on >>> 64bit ARM64 kernel without this patch? >>> >> >> I've checked in fs/compat_ioctl.c, I see no fallback in >> COMPAT_SYSCALL_DEFINE3, >> so one has to provide compat_ioctl callback to have ioctl working with >> 32bit >> apps. > > > Then my memory cheated on me. > > In this case the patch is Reviewed-by: Christian König > . Since you have commit rights for drm-misc, care to push this to drm-misc-next-fixes pls? Also I think this warrants a cc: stable, clearly an obvious screw-up in creating this api on our side :( So feel free to smash my ack on the patch. Thanks, Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: [PATCH] dma-buf: add support for compat ioctl
Am 21.02.2017 um 15:55 schrieb Marek Szyprowski: Dear All, On 2017-02-21 15:37, Marek Szyprowski wrote: Hi Christian, On 2017-02-21 14:59, Christian König wrote: Am 21.02.2017 um 14:21 schrieb Marek Szyprowski: Add compat ioctl support to dma-buf. This lets one to use DMA_BUF_IOCTL_SYNC ioctl from 32bit application on 64bit kernel. Data structures for both 32 and 64bit modes are same, so there is no need for additional translation layer. Well I might be wrong, but IIRC compat_ioctl was just optional and if not specified unlocked_ioctl was called instead. If that is true your patch wouldn't have any effect at all. Well, then why I got -ENOTTY in the 32bit test app for this ioctl on 64bit ARM64 kernel without this patch? I've checked in fs/compat_ioctl.c, I see no fallback in COMPAT_SYSCALL_DEFINE3, so one has to provide compat_ioctl callback to have ioctl working with 32bit apps. Then my memory cheated on me. In this case the patch is Reviewed-by: Christian König . Regards, Christian. Best regards ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: [PATCH] dma-buf: add support for compat ioctl
Dear All, On 2017-02-21 15:37, Marek Szyprowski wrote: Hi Christian, On 2017-02-21 14:59, Christian König wrote: Am 21.02.2017 um 14:21 schrieb Marek Szyprowski: Add compat ioctl support to dma-buf. This lets one to use DMA_BUF_IOCTL_SYNC ioctl from 32bit application on 64bit kernel. Data structures for both 32 and 64bit modes are same, so there is no need for additional translation layer. Well I might be wrong, but IIRC compat_ioctl was just optional and if not specified unlocked_ioctl was called instead. If that is true your patch wouldn't have any effect at all. Well, then why I got -ENOTTY in the 32bit test app for this ioctl on 64bit ARM64 kernel without this patch? I've checked in fs/compat_ioctl.c, I see no fallback in COMPAT_SYSCALL_DEFINE3, so one has to provide compat_ioctl callback to have ioctl working with 32bit apps. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: [PATCH] dma-buf: add support for compat ioctl
Hi Christian, On 2017-02-21 14:59, Christian König wrote: Am 21.02.2017 um 14:21 schrieb Marek Szyprowski: Add compat ioctl support to dma-buf. This lets one to use DMA_BUF_IOCTL_SYNC ioctl from 32bit application on 64bit kernel. Data structures for both 32 and 64bit modes are same, so there is no need for additional translation layer. Well I might be wrong, but IIRC compat_ioctl was just optional and if not specified unlocked_ioctl was called instead. If that is true your patch wouldn't have any effect at all. Well, then why I got -ENOTTY in the 32bit test app for this ioctl on 64bit ARM64 kernel without this patch? Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
Re: [PATCH] dma-buf: add support for compat ioctl
Am 21.02.2017 um 14:21 schrieb Marek Szyprowski: Add compat ioctl support to dma-buf. This lets one to use DMA_BUF_IOCTL_SYNC ioctl from 32bit application on 64bit kernel. Data structures for both 32 and 64bit modes are same, so there is no need for additional translation layer. Well I might be wrong, but IIRC compat_ioctl was just optional and if not specified unlocked_ioctl was called instead. If that is true your patch wouldn't have any effect at all. Regards, Christian. Signed-off-by: Marek Szyprowski --- drivers/dma-buf/dma-buf.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 718f832a5c71..0007b792827b 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -325,6 +325,9 @@ static long dma_buf_ioctl(struct file *file, .llseek = dma_buf_llseek, .poll = dma_buf_poll, .unlocked_ioctl = dma_buf_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = dma_buf_ioctl, +#endif }; /* ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
[PATCH] dma-buf: add support for compat ioctl
Add compat ioctl support to dma-buf. This lets one to use DMA_BUF_IOCTL_SYNC ioctl from 32bit application on 64bit kernel. Data structures for both 32 and 64bit modes are same, so there is no need for additional translation layer. Signed-off-by: Marek Szyprowski --- drivers/dma-buf/dma-buf.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 718f832a5c71..0007b792827b 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -325,6 +325,9 @@ static long dma_buf_ioctl(struct file *file, .llseek = dma_buf_llseek, .poll = dma_buf_poll, .unlocked_ioctl = dma_buf_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = dma_buf_ioctl, +#endif }; /* -- 1.9.1 ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
