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Date: Wed, 22 Mar 2023 06:22:16 +0000
From: Ming Qian <ming.qian@....com>
To: Benjamin Gaignard <benjamin.gaignard@...labora.com>,
"tfiga@...omium.org" <tfiga@...omium.org>,
"m.szyprowski@...sung.com" <m.szyprowski@...sung.com>,
"mchehab@...nel.org" <mchehab@...nel.org>,
Eagle Zhou <eagle.zhou@....com>,
"bin.liu@...iatek.com" <bin.liu@...iatek.com>,
"matthias.bgg@...il.com" <matthias.bgg@...il.com>,
"angelogioacchino.delregno@...labora.com"
<angelogioacchino.delregno@...labora.com>,
"tiffany.lin@...iatek.com" <tiffany.lin@...iatek.com>,
"andrew-ct.chen@...iatek.com" <andrew-ct.chen@...iatek.com>,
"yunfei.dong@...iatek.com" <yunfei.dong@...iatek.com>,
"stanimir.k.varbanov@...il.com" <stanimir.k.varbanov@...il.com>,
"quic_vgarodia@...cinc.com" <quic_vgarodia@...cinc.com>,
"agross@...nel.org" <agross@...nel.org>,
"andersson@...nel.org" <andersson@...nel.org>,
"konrad.dybcio@...aro.org" <konrad.dybcio@...aro.org>,
"ezequiel@...guardiasur.com.ar" <ezequiel@...guardiasur.com.ar>,
"p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
"daniel.almeida@...labora.com" <daniel.almeida@...labora.com>,
"hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
"laurent.pinchart@...asonboard.com"
<laurent.pinchart@...asonboard.com>,
"jernel@...nel.org" <jernel@...nel.org>
CC: "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-mediatek@...ts.infradead.org"
<linux-mediatek@...ts.infradead.org>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
"linux-rockchip@...ts.infradead.org"
<linux-rockchip@...ts.infradead.org>,
"kernel@...labora.com" <kernel@...labora.com>
Subject: RE: [EXT] [PATCH v2 3/8] media: videobuf2: Add a module param to
limit vb2 queue buffer storage
Hi Benjamin,
>Add module parameter "max_vb_buffer_per_queue" to be able to limit the
>number of vb2 buffers store in queue.
>
>Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>---
> drivers/media/common/videobuf2/videobuf2-core.c | 15 +++------------
> include/media/videobuf2-core.h | 11 +++++++++--
> 2 files changed, 12 insertions(+), 14 deletions(-)
>
>diff --git a/drivers/media/common/videobuf2/videobuf2-core.c
>b/drivers/media/common/videobuf2/videobuf2-core.c
>index ae9d72f4d181..f4da917ccf3f 100644
>--- a/drivers/media/common/videobuf2/videobuf2-core.c
>+++ b/drivers/media/common/videobuf2/videobuf2-core.c
>@@ -34,6 +34,8 @@
> static int debug;
> module_param(debug, int, 0644);
>
>+module_param(max_vb_buffer_per_queue, ulong, 0644);
>+
> #define dprintk(q, level, fmt, arg...) \
> do { \
> if (debug >= level) \
>@@ -412,10 +414,6 @@ static int __vb2_queue_alloc(struct vb2_queue *q,
>enum vb2_memory memory,
> struct vb2_buffer *vb;
> int ret;
>
>- /* Ensure that q->num_buffers+num_buffers is below VB2_MAX_FRAME
>*/
>- num_buffers = min_t(unsigned int, num_buffers,
>- VB2_MAX_FRAME - q->num_buffers);
>-
> for (buffer = 0; buffer < num_buffers; ++buffer) {
> /* Allocate vb2 buffer structures */
> vb = kzalloc(q->buf_struct_size, GFP_KERNEL); @@ -801,9 +799,7
>@@ int vb2_core_reqbufs(struct vb2_queue *q, enum vb2_memory memory,
> /*
> * Make sure the requested values and current defaults are sane.
> */
>- WARN_ON(q->min_buffers_needed > VB2_MAX_FRAME);
> num_buffers = max_t(unsigned int, *count, q->min_buffers_needed);
>- num_buffers = min_t(unsigned int, num_buffers, VB2_MAX_FRAME);
> memset(q->alloc_devs, 0, sizeof(q->alloc_devs));
> /*
> * Set this now to ensure that drivers see the correct q->memory value
>@@ -919,11 +915,6 @@ int vb2_core_create_bufs(struct vb2_queue *q,
>enum vb2_memory memory,
> bool no_previous_buffers = !q->num_buffers;
> int ret;
>
>- if (q->num_buffers == VB2_MAX_FRAME) {
>- dprintk(q, 1, "maximum number of buffers already allocated\n");
>- return -ENOBUFS;
>- }
>-
> if (no_previous_buffers) {
> if (q->waiting_in_dqbuf && *count) {
> dprintk(q, 1, "another dup()ped fd is waiting for a buffer\n");
>@@ -948,7 +939,7 @@ int vb2_core_create_bufs(struct vb2_queue *q, enum
>vb2_memory memory,
> return -EINVAL;
> }
>
>- num_buffers = min(*count, VB2_MAX_FRAME - q->num_buffers);
>+ num_buffers = *count;
>
> if (requested_planes && requested_sizes) {
> num_planes = requested_planes; diff --git
>a/include/media/videobuf2-core.h b/include/media/videobuf2-core.h index
>397dbf6e61e1..b8b34a993e04 100644
>--- a/include/media/videobuf2-core.h
>+++ b/include/media/videobuf2-core.h
>@@ -12,6 +12,7 @@
> #ifndef _MEDIA_VIDEOBUF2_CORE_H
> #define _MEDIA_VIDEOBUF2_CORE_H
>
>+#include <linux/minmax.h>
> #include <linux/mm_types.h>
> #include <linux/mutex.h>
> #include <linux/poll.h>
>@@ -48,6 +49,8 @@ struct vb2_fileio_data; struct vb2_threadio_data; struct
>vb2_buffer;
>
>+static size_t max_vb_buffer_per_queue = 1024;
>+
> /**
> * struct vb2_mem_ops - memory handling/memory allocator operations.
> * @alloc: allocate video memory and, optionally, allocator private data,
>@@ -1268,12 +1271,16 @@ static inline bool vb2_queue_add_buffer(struct
>vb2_queue *q, struct vb2_buffer *
>
> if (vb->index >= q->max_num_bufs) {
> struct vb2_buffer **tmp;
>+ int cnt = min(max_vb_buffer_per_queue, q->max_num_bufs *
>+ 2);
>+
>+ if (cnt >= q->max_num_bufs)
>+ goto realloc_failed;
>
Is it likely that goto realloc_failed directly?
The cnt is likely equal to q->max_num_bufs * 2, and it will greater than q->max_num_bufs.
For example, the default value of q->max_num_bufs is 32, when vb->index comes to 32, cnt is 64, it's greater than 32, then goto recalloc_failed?
>- tmp = krealloc_array(q->bufs, q->max_num_bufs * 2, sizeof(*q-
>>bufs), GFP_KERNEL);
>+ tmp = krealloc_array(q->bufs, cnt, sizeof(*q->bufs),
>+ GFP_KERNEL);
> if (!tmp)
> goto realloc_failed;
>
>- q->max_num_bufs *= 2;
>+ q->max_num_bufs = cnt;
> q->bufs = tmp;
> }
>
>--
>2.34.1
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