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Message-ID: <a8506b6d-512e-6e20-e390-e064d48c4a04@gmail.com>
Date: Mon, 20 Feb 2023 09:29:39 +0100
From: Christian König <ckoenig.leichtzumerken@...il.com>
To: Rob Clark <robdclark@...il.com>, dri-devel@...ts.freedesktop.org
Cc: freedreno@...ts.freedesktop.org, Daniel Vetter <daniel@...ll.ch>,
Michel Dänzer <michel@...nzer.net>,
Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Alex Deucher <alexander.deucher@....com>,
Pekka Paalanen <ppaalanen@...il.com>,
Simon Ser <contact@...rsion.fr>,
Rob Clark <robdclark@...omium.org>,
Sumit Semwal <sumit.semwal@...aro.org>,
Gustavo Padovan <gustavo@...ovan.org>,
Christian König <christian.koenig@....com>,
"open list:SYNC FILE FRAMEWORK" <linux-media@...r.kernel.org>,
"moderated list:DMA BUFFER SHARING FRAMEWORK"
<linaro-mm-sig@...ts.linaro.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 07/14] dma-buf/sw_sync: Add fence deadline support
Am 18.02.23 um 22:15 schrieb Rob Clark:
> From: Rob Clark <robdclark@...omium.org>
>
> This consists of simply storing the most recent deadline, and adding an
> ioctl to retrieve the deadline. This can be used in conjunction with
> the SET_DEADLINE ioctl on a fence fd for testing. Ie. create various
> sw_sync fences, merge them into a fence-array, set deadline on the
> fence-array and confirm that it is propagated properly to each fence.
>
> Signed-off-by: Rob Clark <robdclark@...omium.org>
Reviewed-by: Christian König <christian.koenig@....com>
> ---
> drivers/dma-buf/sw_sync.c | 58 ++++++++++++++++++++++++++++++++++++
> drivers/dma-buf/sync_debug.h | 2 ++
> 2 files changed, 60 insertions(+)
>
> diff --git a/drivers/dma-buf/sw_sync.c b/drivers/dma-buf/sw_sync.c
> index 348b3a9170fa..50f2638cccd3 100644
> --- a/drivers/dma-buf/sw_sync.c
> +++ b/drivers/dma-buf/sw_sync.c
> @@ -52,12 +52,26 @@ struct sw_sync_create_fence_data {
> __s32 fence; /* fd of new fence */
> };
>
> +/**
> + * struct sw_sync_get_deadline - get the deadline of a sw_sync fence
> + * @tv_sec: seconds elapsed since epoch (out)
> + * @tv_nsec: nanoseconds elapsed since the time given by the tv_sec (out)
> + * @fence_fd: the sw_sync fence fd (in)
> + */
> +struct sw_sync_get_deadline {
> + __s64 tv_sec;
> + __s32 tv_nsec;
> + __s32 fence_fd;
> +};
> +
> #define SW_SYNC_IOC_MAGIC 'W'
>
> #define SW_SYNC_IOC_CREATE_FENCE _IOWR(SW_SYNC_IOC_MAGIC, 0,\
> struct sw_sync_create_fence_data)
>
> #define SW_SYNC_IOC_INC _IOW(SW_SYNC_IOC_MAGIC, 1, __u32)
> +#define SW_SYNC_GET_DEADLINE _IOWR(SW_SYNC_IOC_MAGIC, 2, \
> + struct sw_sync_get_deadline)
>
> static const struct dma_fence_ops timeline_fence_ops;
>
> @@ -171,6 +185,13 @@ static void timeline_fence_timeline_value_str(struct dma_fence *fence,
> snprintf(str, size, "%d", parent->value);
> }
>
> +static void timeline_fence_set_deadline(struct dma_fence *fence, ktime_t deadline)
> +{
> + struct sync_pt *pt = dma_fence_to_sync_pt(fence);
> +
> + pt->deadline = deadline;
> +}
> +
> static const struct dma_fence_ops timeline_fence_ops = {
> .get_driver_name = timeline_fence_get_driver_name,
> .get_timeline_name = timeline_fence_get_timeline_name,
> @@ -179,6 +200,7 @@ static const struct dma_fence_ops timeline_fence_ops = {
> .release = timeline_fence_release,
> .fence_value_str = timeline_fence_value_str,
> .timeline_value_str = timeline_fence_timeline_value_str,
> + .set_deadline = timeline_fence_set_deadline,
> };
>
> /**
> @@ -387,6 +409,39 @@ static long sw_sync_ioctl_inc(struct sync_timeline *obj, unsigned long arg)
> return 0;
> }
>
> +static int sw_sync_ioctl_get_deadline(struct sync_timeline *obj, unsigned long arg)
> +{
> + struct sw_sync_get_deadline data;
> + struct timespec64 ts;
> + struct dma_fence *fence;
> + struct sync_pt *pt;
> +
> + if (copy_from_user(&data, (void __user *)arg, sizeof(data)))
> + return -EFAULT;
> +
> + if (data.tv_sec || data.tv_nsec)
> + return -EINVAL;
> +
> + fence = sync_file_get_fence(data.fence_fd);
> + if (!fence)
> + return -EINVAL;
> +
> + pt = dma_fence_to_sync_pt(fence);
> + if (!pt)
> + return -EINVAL;
> +
> + ts = ktime_to_timespec64(pt->deadline);
> + data.tv_sec = ts.tv_sec;
> + data.tv_nsec = ts.tv_nsec;
> +
> + dma_fence_put(fence);
> +
> + if (copy_to_user((void __user *)arg, &data, sizeof(data)))
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> static long sw_sync_ioctl(struct file *file, unsigned int cmd,
> unsigned long arg)
> {
> @@ -399,6 +454,9 @@ static long sw_sync_ioctl(struct file *file, unsigned int cmd,
> case SW_SYNC_IOC_INC:
> return sw_sync_ioctl_inc(obj, arg);
>
> + case SW_SYNC_GET_DEADLINE:
> + return sw_sync_ioctl_get_deadline(obj, arg);
> +
> default:
> return -ENOTTY;
> }
> diff --git a/drivers/dma-buf/sync_debug.h b/drivers/dma-buf/sync_debug.h
> index 6176e52ba2d7..2e0146d0bdbb 100644
> --- a/drivers/dma-buf/sync_debug.h
> +++ b/drivers/dma-buf/sync_debug.h
> @@ -55,11 +55,13 @@ static inline struct sync_timeline *dma_fence_parent(struct dma_fence *fence)
> * @base: base fence object
> * @link: link on the sync timeline's list
> * @node: node in the sync timeline's tree
> + * @deadline: the most recently set fence deadline
> */
> struct sync_pt {
> struct dma_fence base;
> struct list_head link;
> struct rb_node node;
> + ktime_t deadline;
> };
>
> extern const struct file_operations sw_sync_debugfs_fops;
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