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Message-ID: <CA+Px+wUjJwksVfU6N8VZ9WMw-F-DHu67XwvDvMoiMcUBKF=P6Q@mail.gmail.com>
Date: Fri, 9 Jul 2021 17:39:23 +0800
From: Tzung-Bi Shih <tzungbi@...gle.com>
To: Yunfei Dong <Yunfei.Dong@...iatek.com>
Cc: Alexandre Courbot <acourbot@...omium.org>,
Hans Verkuil <hverkuil-cisco@...all.nl>,
Tzung-Bi Shih <tzungbi@...omium.org>,
Tiffany Lin <tiffany.lin@...iatek.com>,
Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Rob Herring <robh+dt@...nel.org>,
Matthias Brugger <matthias.bgg@...il.com>,
Tomasz Figa <tfiga@...gle.com>,
Hsin-Yi Wang <hsinyi@...omium.org>,
Fritz Koenig <frkoenig@...omium.org>,
Irui Wang <irui.wang@...iatek.com>,
linux-media@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
srv_heupstream@...iatek.com, linux-mediatek@...ts.infradead.org,
Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v1, 07/14] media: mtk-vcodec: Add msg queue feature for
lat and core architecture
On Wed, Jul 7, 2021 at 2:22 PM Yunfei Dong <yunfei.dong@...iatek.com> wrote:
> @@ -464,6 +469,11 @@ struct mtk_vcodec_enc_pdata {
> * comp_dev: component hardware device
> * component_node: component node
> * comp_idx: component index
> + *
> + * core_read: Wait queue used to signalize when core get useful lat buffer
> + * core_queue: List of V4L2 lat_buf
To be neat, replace "Wait" to "wait" and "List" to "list".
> +int vdec_msg_queue_init(
> + struct mtk_vcodec_ctx *ctx,
> + struct vdec_msg_queue *msg_queue,
> + core_decode_cb_t core_decode,
> + int private_size)
> +{
> + struct vdec_lat_buf *lat_buf;
> + int i, err;
> +
> + init_waitqueue_head(&msg_queue->lat_read);
> + INIT_LIST_HEAD(&msg_queue->lat_queue);
> + spin_lock_init(&msg_queue->lat_lock);
> + msg_queue->num_lat = 0;
> +
> + msg_queue->wdma_addr.size = vde_msg_queue_get_trans_size(
> + ctx->picinfo.buf_w, ctx->picinfo.buf_h);
> +
> + err = mtk_vcodec_mem_alloc(ctx, &msg_queue->wdma_addr);
> + if (err) {
> + mtk_v4l2_err("failed to allocate wdma_addr buf");
> + return -ENOMEM;
> + }
> + msg_queue->wdma_rptr_addr = msg_queue->wdma_addr.dma_addr;
> + msg_queue->wdma_wptr_addr = msg_queue->wdma_addr.dma_addr;
> +
> + for (i = 0; i < NUM_BUFFER_COUNT; i++) {
> + lat_buf = &msg_queue->lat_buf[i];
> +
> + lat_buf->wdma_err_addr.size = VDEC_ERR_MAP_SZ_AVC;
> + err = mtk_vcodec_mem_alloc(ctx, &lat_buf->wdma_err_addr);
> + if (err) {
> + mtk_v4l2_err("failed to allocate wdma_err_addr buf[%d]", i);
> + return -ENOMEM;
> + }
> +
> + lat_buf->slice_bc_addr.size = VDEC_LAT_SLICE_HEADER_SZ;
> + err = mtk_vcodec_mem_alloc(ctx, &lat_buf->slice_bc_addr);
> + if (err) {
> + mtk_v4l2_err("failed to allocate wdma_addr buf[%d]", i);
> + return -ENOMEM;
> + }
> +
> + lat_buf->private_data = kzalloc(private_size, GFP_KERNEL);
> + if (!lat_buf->private_data) {
> + mtk_v4l2_err("failed to allocate private_data[%d]", i);
> + return -ENOMEM;
> + }
> +
> + lat_buf->ctx = ctx;
> + lat_buf->core_decode = core_decode;
> + vdec_msg_queue_buf_to_lat(lat_buf);
> + }
Doesn't it need to call mtk_vcodec_mem_free() and kfree() for any failure paths?
> +struct vdec_lat_buf *vdec_msg_queue_get_core_buf(
> + struct mtk_vcodec_dev *dev)
> +{
> + struct vdec_lat_buf *buf;
> + int ret;
> +
> + spin_lock(&dev->core_lock);
> + if (list_empty(&dev->core_queue)) {
> + mtk_v4l2_debug(3, "core queue is NULL, num_core = %d", dev->num_core);
> + spin_unlock(&dev->core_lock);
> + ret = wait_event_freezable(dev->core_read,
> + !list_empty(&dev->core_queue));
> + if (ret)
> + return NULL;
Should be !ret?
> +void vdec_msg_queue_buf_to_core(struct mtk_vcodec_dev *dev,
> + struct vdec_lat_buf *buf)
> +{
> + spin_lock(&dev->core_lock);
> + list_add_tail(&buf->core_list, &dev->core_queue);
> + dev->num_core++;
> + wake_up_all(&dev->core_read);
> + mtk_v4l2_debug(3, "queu buf addr: (0x%p)", buf);
Typo.
> +bool vdec_msg_queue_wait_lat_buf_full(struct vdec_msg_queue *msg_queue)
> +{
> + long timeout_jiff;
> + int ret, i;
> +
> + for (i = 0; i < NUM_BUFFER_COUNT + 2; i++) {
> + timeout_jiff = msecs_to_jiffies(1000);
> + ret = wait_event_timeout(msg_queue->lat_read,
> + msg_queue->num_lat == NUM_BUFFER_COUNT, timeout_jiff);
> + if (ret) {
> + mtk_v4l2_debug(3, "success to get lat buf: %d",
> + msg_queue->num_lat);
> + return true;
> + }
> + }
Why does it need the loop? i is unused.
> +void vdec_msg_queue_deinit(
> + struct mtk_vcodec_ctx *ctx,
> + struct vdec_msg_queue *msg_queue)
> +{
> + struct vdec_lat_buf *lat_buf;
> + struct mtk_vcodec_mem *mem;
> + int i;
> +
> + mem = &msg_queue->wdma_addr;
> + if (mem->va)
> + mtk_vcodec_mem_free(ctx, mem);
> + for (i = 0; i < NUM_BUFFER_COUNT; i++) {
> + lat_buf = &msg_queue->lat_buf[i];
> +
> + mem = &lat_buf->wdma_err_addr;
> + if (mem->va)
> + mtk_vcodec_mem_free(ctx, mem);
> +
> + mem = &lat_buf->slice_bc_addr;
> + if (mem->va)
> + mtk_vcodec_mem_free(ctx, mem);
> +
> + if (lat_buf->private_data)
> + kfree(lat_buf->private_data);
> + }
> +
> + msg_queue->init_done = false;
Have no idea what init_done does in the code. It is not included in
any branch condition.
> +/**
> + * vdec_msg_queue_init - init lat buffer information.
> + * @ctx: v4l2 ctx
> + * @msg_queue: used to store the lat buffer information
> + * @core_decode: core decode callback for each codec
> + * @private_size: the private data size used to share with core
> + */
> +int vdec_msg_queue_init(
> + struct mtk_vcodec_ctx *ctx,
> + struct vdec_msg_queue *msg_queue,
> + core_decode_cb_t core_decode,
> + int private_size);
Would prefer to have *msg_queue as the first argument (also applies to
all operators of vdec_msg_queue).
> +/**
> + * vdec_msg_queue_get_core_buf - get used core buffer for lat decode.
> + * @dev: mtk vcodec device
> + */
> +struct vdec_lat_buf *vdec_msg_queue_get_core_buf(
> + struct mtk_vcodec_dev *dev);
This is weird: vdec_msg_queue's operator but manipulating mtk_vcodec_dev?
> +
> +/**
> + * vdec_msg_queue_buf_to_core - queue buf to the core for core decode.
> + * @dev: mtk vcodec device
> + * @buf: current lat buffer
> + */
> +void vdec_msg_queue_buf_to_core(struct mtk_vcodec_dev *dev,
> + struct vdec_lat_buf *buf);
Also weird.
> +/**
> + * vdec_msg_queue_buf_to_lat - queue buf to lat for lat decode.
> + * @buf: current lat buffer
> + */
> +void vdec_msg_queue_buf_to_lat(struct vdec_lat_buf *buf);
It should at least accept a struct vdec_msg_queue argument (or which
msg queue should the buf put into?).
> +/**
> + * vdec_msg_queue_update_ube_rptr - used to updata the ube read point.
Typo.
> +/**
> + * vdec_msg_queue_update_ube_wptr - used to updata the ube write point.
Typo.
> +/**
> + * vdec_msg_queue_deinit - deinit lat buffer information.
> + * @ctx: v4l2 ctx
> + * @msg_queue: used to store the lat buffer information
> + */
> +void vdec_msg_queue_deinit(
> + struct mtk_vcodec_ctx *ctx,
> + struct vdec_msg_queue *msg_queue);
Would prefer to have *msg_queue as the first argument.
The position of struct vdec_msg_queue is weird. It looks like the msg
queue is only for struct vdec_lat_buf. If so, would vdec_msg_queue be
better to call vdec_lat_queue or something similar?
It shouldn't touch the core queue in mtk_vcodec_dev anyway. Is it
possible to generalize the queue-related code for both lat and core
queues?
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