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SubjectRe: [RESEND PATCH v2 05/15] ASoC: qcom: qdsp6: Add support to Q6ADM
On Thu 14 Dec 09:33 PST 2017, srinivas.kandagatla@linaro.org wrote:

> From: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
>
> This patch adds support to q6 ADM (Audio Device Manager) module in
> q6dsp. ADM performs routing between audio streams and AFE ports.
> It does Rate matching for streams going to devices driven by

lower case "Rate"

> different clocks, it handles volume ramping, Mixing with channel

and "Mixing"

> and bit-width. ADM creates and destroys dynamic COPP services
> for device-related audio processing as needed.

What's a "copp"?

>
> This patch adds basic support to ADM.

Wouldn't s/to/for/ be better?

[..]
> +struct copp {
> + int afe_port;
> + int copp_idx;
> + int id;
> + int cnt;

Please rename this "refcnt" to match other kernel code.

> + int topology;
> + int mode;
> + int stat;
> + int rate;
> + int bit_width;
> + int channels;
> + int app_type;
> + int acdb_id;
> + wait_queue_head_t wait;
> + struct list_head node;
> + struct q6adm *adm;
> +};
> +
> +struct q6adm {
> + struct apr_device *apr;
> + struct device *dev;
> + unsigned long copp_bitmap[AFE_MAX_PORTS];
> + struct list_head copps_list;
> + spinlock_t copps_list_lock;
> + int matrix_map_stat;
> + struct platform_device *routing_dev;
> +
> + wait_queue_head_t matrix_map_wait;
> +};
> +
> +static struct copp *adm_find_copp(struct q6adm *adm, int port_idx, int copp_idx)
> +{
> + struct copp *c;
> +
> + spin_lock(&adm->copps_list_lock);
> + list_for_each_entry(c, &adm->copps_list, node) {
> + if ((port_idx == c->afe_port) && (copp_idx == c->copp_idx)) {
> + spin_unlock(&adm->copps_list_lock);
> + return c;
> + }
> + }
> +
> + spin_unlock(&adm->copps_list_lock);
> + return NULL;
> +
> +}
> +
> +static struct copp *adm_find_matching_copp(struct q6adm *adm,
> + int port_idx, int topology,
> + int mode, int rate,
> + int bit_width, int app_type)
> +{
> + struct copp *c;
> +
> + spin_lock(&adm->copps_list_lock);
> +
> + list_for_each_entry(c, &adm->copps_list, node) {
> + if ((port_idx == c->afe_port) && (topology == c->topology) &&
> + (mode == c->mode) && (rate == c->rate) &&
> + (bit_width == c->bit_width) && (app_type == c->app_type)) {
> + spin_unlock(&adm->copps_list_lock);
> + return c;
> + }
> + }
> + spin_unlock(&adm->copps_list_lock);
> +
> + return NULL;
> +
> +}
> +
> +static int adm_callback(struct apr_device *adev, struct apr_client_data *data)
> +{
> + uint32_t *payload;
> + int port_idx, copp_idx;
> + struct copp *copp;
> + struct q6adm *adm = dev_get_drvdata(&adev->dev);
> +
> + payload = data->payload;
> +
> + if (data->payload_size) {

Bail if you don't have a payload and save yourself one indentation
level.

> + copp_idx = (data->token) & 0XFF;
> + port_idx = ((data->token) >> 16) & 0xFF;
> + if (port_idx < 0 || port_idx >= AFE_MAX_PORTS) {
> + dev_err(&adev->dev, "Invalid port idx %d token %d\n",
> + port_idx, data->token);
> + return 0;
> + }
> + if (copp_idx < 0 || copp_idx >= MAX_COPPS_PER_PORT) {
> + dev_err(&adev->dev, "Invalid copp idx %d token %d\n",
> + copp_idx, data->token);
> + return 0;
> + }
> +
> + if (data->opcode == APR_BASIC_RSP_RESULT) {

This is a case in the following switch statement.

> + if (payload[1] != 0) {
> + dev_err(&adev->dev, "cmd = 0x%x returned error = 0x%x\n",
> + payload[0], payload[1]);

This would again benefit from a small struct...

> + }
> + switch (payload[0]) {
> + case ADM_CMD_DEVICE_OPEN_V5:
> + case ADM_CMD_DEVICE_CLOSE_V5:
> + copp = adm_find_copp(adm, port_idx, copp_idx);
> + if (IS_ERR_OR_NULL(copp))
> + return 0;
> +
> + copp->stat = payload[1];
> + wake_up(&copp->wait);
> + break;
> + case ADM_CMD_MATRIX_MAP_ROUTINGS_V5:
> + adm->matrix_map_stat = payload[1];
> + wake_up(&adm->matrix_map_wait);
> + break;
> +
> + default:
> + dev_err(&adev->dev, "Unknown Cmd: 0x%x\n",
> + payload[0]);
> + break;
> + }
> + return 0;
> + }
> +
> + switch (data->opcode) {
> + case ADM_CMDRSP_DEVICE_OPEN_V5:{

Perhaps it would be cleaner to break these out in separate functions?

> + struct adm_cmd_rsp_device_open_v5 {
> + u32 status;
> + u16 copp_id;
> + u16 reserved;
> + } __packed * open = data->payload;
> +
> + open = data->payload;
> + copp = adm_find_copp(adm, port_idx, copp_idx);
> + if (IS_ERR_OR_NULL(copp))
> + return 0;
> +
> + if (open->copp_id == INVALID_COPP_ID) {
> + dev_err(&adev->dev, "Invalid coppid rxed %d\n",
> + open->copp_id);
> + copp->stat = ADSP_EBADPARAM;
> + wake_up(&copp->wait);
> + break;
> + }
> + copp->stat = payload[0];
> + copp->id = open->copp_id;
> + pr_debug("%s: coppid rxed=%d\n", __func__,

You have a dev, use dev_dbg()

> + open->copp_id);
> + wake_up(&copp->wait);
> +
> + }
> + break;
> + default:
> + dev_err(&adev->dev, "Unknown cmd:0x%x\n",
> + data->opcode);
> + break;
> + }
> + }
> + return 0;
> +}
> +
> +static struct copp *adm_alloc_copp(struct q6adm *adm, int port_idx)
> +{
> + struct copp *c;
> + int idx;
> +
> + idx = find_first_zero_bit(&adm->copp_bitmap[port_idx],
> + MAX_COPPS_PER_PORT);
> +
> + if (idx > MAX_COPPS_PER_PORT)
> + return ERR_PTR(-EBUSY);
> +
> + set_bit(idx, &adm->copp_bitmap[port_idx]);
> +
> + c = devm_kzalloc(adm->dev, sizeof(*c), GFP_KERNEL);
> + if (!c)

Set the bit after doing the allocation and you don't need to clear it
here.

> + return ERR_PTR(-ENOMEM);
> + c->copp_idx = idx;
> + c->afe_port = port_idx;
> + c->adm = adm;
> +
> + init_waitqueue_head(&c->wait);
> +
> + spin_lock(&adm->copps_list_lock);
> + list_add_tail(&c->node, &adm->copps_list);
> + spin_unlock(&adm->copps_list_lock);
> +
> + return c;
> +}
> +
> +static void adm_free_copp(struct q6adm *adm, struct copp *c, int port_idx)
> +{
> + clear_bit(c->copp_idx, &adm->copp_bitmap[port_idx]);
> + spin_lock(&adm->copps_list_lock);
> + list_del(&c->node);
> + spin_unlock(&adm->copps_list_lock);

This function clear the copp_bitmap, so after recycling this once
c->copp_idx will be "dangling".

This seems to put the copp in a state where it is invalid and as the
copp is "reset" i don't think adm_find_matching_copp() will actually
find this again, ever...

So shouldn't you free the copp here too - rather than relying on devm
doing that at some later point in time?

> +}
> +/**
> + * q6adm_open() - open adm to get hold of free copp

"open adm and grab a free copp"?

> + *
> + * @dev: Pointer to adm child device.
> + * @port_id: port id
> + * @path: playback or capture path.
> + * @rate: rate at which copp is required.
> + * @channel_mode: channel mode
> + * @topology: adm topology id
> + * @perf_mode: performace mode.
> + * @bit_width: audio sample bit width
> + * @app_type: Application type.
> + * @acdb_id: ACDB id
> + *
> + * Return: Will be an negative on error or a valid copp index on success.
> + */
> +int q6adm_open(struct device *dev, int port_id, int path, int rate,
> + int channel_mode, int topology, int perf_mode,
> + uint16_t bit_width, int app_type, int acdb_id)
> +{
> + struct adm_cmd_device_open_v5 {
> + struct apr_hdr hdr;
> + u16 flags;
> + u16 mode_of_operation;
> + u16 endpoint_id_1;
> + u16 endpoint_id_2;
> + u32 topology_id;
> + u16 dev_num_channel;
> + u16 bit_width;
> + u32 sample_rate;
> + u8 dev_channel_mapping[8];
> + } __packed open;
> + int ret = 0;
> + int port_idx, flags;
> + int tmp_port = q6afe_get_port_id(port_id);
> + struct copp *copp;
> + struct q6adm *adm = dev_get_drvdata(dev->parent);
> +
> + port_idx = port_id;

I'm not seeing the reason for having two different variables with the
same value.

> + if (port_idx < 0) {
> + dev_err(dev, "Invalid port_id 0x%x\n", port_id);
> + return -EINVAL;
> + }
> +
> + flags = ADM_LEGACY_DEVICE_SESSION;

Just put ADM_LEGACY_DEVICE_SESSION in the assignment below.

> + copp = adm_find_matching_copp(adm, port_idx, topology, perf_mode,
> + rate, bit_width, app_type);
> +
> + if (!copp) {
> + copp = adm_alloc_copp(adm, port_idx);
> + if (IS_ERR_OR_NULL(copp))
> + return PTR_ERR(copp);
> +
> + copp->cnt = 0;
> + copp->topology = topology;
> + copp->mode = perf_mode;
> + copp->rate = rate;
> + copp->channels = channel_mode;
> + copp->bit_width = bit_width;
> + copp->app_type = app_type;
> + }

I would suggest that you make adm_find_matching_copp() allocate the new
copp if none is found.

> +
> + /* Create a COPP if port id are not enabled */
> + if (copp->cnt == 0) {

Doesn't this scheme require some locking? What about concurrent close()?

> +
> + open.hdr.hdr_field = APR_HDR_FIELD(APR_MSG_TYPE_SEQ_CMD,
> + APR_HDR_LEN(APR_HDR_SIZE),
> + APR_PKT_VER);
> + open.hdr.pkt_size = sizeof(open);
> + open.hdr.src_svc = APR_SVC_ADM;
> + open.hdr.src_domain = APR_DOMAIN_APPS;
> + open.hdr.src_port = tmp_port;
> + open.hdr.dest_svc = APR_SVC_ADM;
> + open.hdr.dest_domain = APR_DOMAIN_ADSP;
> + open.hdr.dest_port = tmp_port;
> + open.hdr.token = port_idx << 16 | copp->copp_idx;
> + open.hdr.opcode = ADM_CMD_DEVICE_OPEN_V5;
> + open.flags = flags;
> + open.mode_of_operation = path;
> + open.endpoint_id_1 = tmp_port;
> + open.topology_id = topology;
> + open.dev_num_channel = channel_mode & 0x00FF;
> + open.bit_width = bit_width;
> + open.sample_rate = rate;

This looks like a q6adm_device_open() helper function.

> +
> + ret = q6dsp_map_channels(&open.dev_channel_mapping[0],
> + channel_mode);
> +
> + if (ret)
> + return ret;
> +
> + copp->stat = -1;
> + ret = apr_send_pkt(adm->apr, (uint32_t *)&open);
> + if (ret < 0) {
> + dev_err(dev, "port_id: 0x%x for[0x%x] failed %d\n",
> + tmp_port, port_id, ret);
> + return -EINVAL;
> + }
> + /* Wait for the callback with copp id */
> + ret =
> + wait_event_timeout(copp->wait, copp->stat >= 0,
> + msecs_to_jiffies(TIMEOUT_MS));
> + if (!ret) {
> + dev_err(dev, "ADM timedout port_id: 0x%x for [0x%x]\n",
> + tmp_port, port_id);
> + return -EINVAL;
> + } else if (copp->stat > 0) {
> + dev_err(dev, "DSP returned error[%s]\n",
> + adsp_err_get_err_str(copp->stat));
> + return adsp_err_get_lnx_err_code(copp->stat);
> + }
> + }
> + copp->cnt++;
> + return copp->copp_idx;
> +}
> +EXPORT_SYMBOL_GPL(q6adm_open);
> +/**
> + * q6adm_matrix_map() - Map asm streams and afe ports using payload
> + *
> + * @dev: Pointer to adm child device.
> + * @path: playback or capture path.
> + * @payload_map: map between session id and afe ports.
> + * @perf_mode: Performace mode.
> + *
> + * Return: Will be an negative on error or a zero on success.
> + */
> +int q6adm_matrix_map(struct device *dev, int path,
> + struct route_payload payload_map, int perf_mode)
> +{
> + struct adm_cmd_matrix_map_routings_v5 {
> + struct apr_hdr hdr;
> + u32 matrix_id;
> + u32 num_sessions;
> + } __packed * route;
> +
> + struct adm_session_map_node_v5 {
> + u16 session_id;
> + u16 num_copps;
> + } __packed * node;
> + struct q6adm *adm = dev_get_drvdata(dev->parent);
> + uint16_t *copps_list;
> + int cmd_size = 0;
> + int ret = 0, i = 0;
> + void *payload = NULL;
> + void *matrix_map = NULL;
> + int port_idx, copp_idx;
> + struct copp *copp;
> +
> + /* Assumes port_ids have already been validated during adm_open */
> + cmd_size = (sizeof(*route) +
> + sizeof(*node) +
> + (sizeof(uint32_t) * payload_map.num_copps));
> + matrix_map = kzalloc(cmd_size, GFP_KERNEL);
> + if (!matrix_map)
> + return -ENOMEM;
> +
> + route = (struct adm_cmd_matrix_map_routings_v5 *)matrix_map;
> + route->hdr.hdr_field = APR_HDR_FIELD(APR_MSG_TYPE_SEQ_CMD,
> + APR_HDR_LEN(APR_HDR_SIZE),
> + APR_PKT_VER);
> + route->hdr.pkt_size = cmd_size;
> + route->hdr.src_svc = 0;
> + route->hdr.src_domain = APR_DOMAIN_APPS;
> + route->hdr.src_port = 0; /* Ignored */

Omit the ignored members instead.

> + route->hdr.dest_svc = APR_SVC_ADM;
> + route->hdr.dest_domain = APR_DOMAIN_ADSP;
> + route->hdr.dest_port = 0; /* Ignored */
> + route->hdr.token = 0;
> + route->hdr.opcode = ADM_CMD_MATRIX_MAP_ROUTINGS_V5;
> + route->num_sessions = 1;
> +
> + switch (path) {
> + case ADM_PATH_PLAYBACK:
> + route->matrix_id = ADM_MATRIX_ID_AUDIO_RX;
> + break;
> + default:
> + dev_err(dev, "Wrong path set[%d]\n", path);
> +
> + break;
> + }
> +
> + payload = ((u8 *) matrix_map + sizeof(*route));

matrix_map is a void *, so no need to cast it to u8 * to calculate the
payload address.

> + node = (struct adm_session_map_node_v5 *)payload;

payload is void *, so no need to typecast here. And for that matter, I'm
not sure about the benefits of having this intermediate "payload"
variable, just assign node directly.

> +
> + node->session_id = payload_map.session_id;
> + node->num_copps = payload_map.num_copps;
> + payload = (u8 *) node + sizeof(*node);
> + copps_list = (uint16_t *) payload;

As with node above, drop the temporary variable and drop the type casts.

> +
> + for (i = 0; i < payload_map.num_copps; i++) {
> + port_idx = payload_map.port_id[i];
> + if (port_idx < 0) {
> + dev_err(dev, "Invalid port_id 0x%x\n",
> + payload_map.port_id[i]);

Leaking matrix_map.

> + return -EINVAL;
> + }
> + copp_idx = payload_map.copp_idx[i];
> +
> + copp = adm_find_copp(adm, port_idx, copp_idx);
> + if (IS_ERR_OR_NULL(copp))

Dito.

> + return -EINVAL;
> +
> + copps_list[i] = copp->id;
> + }
> +
> + adm->matrix_map_stat = -1;
> +
> + ret = apr_send_pkt(adm->apr, (uint32_t *) matrix_map);
> + if (ret < 0) {
> + dev_err(dev, "routing for syream %d failed ret %d\n",
> + payload_map.session_id, ret);
> + ret = -EINVAL;
> + goto fail_cmd;
> + }
> + ret = wait_event_timeout(adm->matrix_map_wait,
> + adm->matrix_map_stat >= 0,
> + msecs_to_jiffies(TIMEOUT_MS));
> + if (!ret) {
> + dev_err(dev, "routing for syream %d failed\n",
> + payload_map.session_id);
> + ret = -EINVAL;
> + goto fail_cmd;
> + } else if (adm->matrix_map_stat > 0) {
> + dev_err(dev, "DSP returned error[%s]\n",
> + adsp_err_get_err_str(adm->matrix_map_stat));
> + ret = adsp_err_get_lnx_err_code(adm->matrix_map_stat);
> + goto fail_cmd;
> + }
> +
> +fail_cmd:
> + kfree(matrix_map);
> + return ret;
> +}
> +EXPORT_SYMBOL_GPL(q6adm_matrix_map);
> +
> +static void adm_reset_copp(struct copp *c)

As far as I can see this will decommission the copp, so I don't think
there is a point in updating any of this and then keep it around?

> +{
> + c->id = RESET_COPP_ID;
> + c->cnt = 0;
> + c->topology = 0;
> + c->mode = 0;
> + c->stat = -1;
> + c->rate = 0;
> + c->channels = 0;
> + c->bit_width = 0;
> + c->app_type = 0;
> +}
> +/**
> + * q6adm_close() - Close adm copp
> + *
> + * @dev: Pointer to adm child device.
> + * @port_id: afe port id.
> + * @perf_mode: perf_mode mode
> + * @copp_idx: copp index to close
> + *
> + * Return: Will be an negative on error or a zero on success.
> + */
> +int q6adm_close(struct device *dev, int port_id, int perf_mode, int copp_idx)
> +{
> + struct apr_hdr close;
> + struct copp *copp;
> +
> + int ret = 0, port_idx;
> + int copp_id = RESET_COPP_ID;
> + struct q6adm *adm = dev_get_drvdata(dev->parent);
> +
> + port_idx = port_id;
> + if (port_idx < 0) {
> + dev_err(dev, "Invalid port_id 0x%x\n", port_id);
> + return -EINVAL;
> + }
> +
> + if ((copp_idx < 0) || (copp_idx >= MAX_COPPS_PER_PORT)) {
> + dev_err(dev, "Invalid copp idx: %d\n", copp_idx);
> + return -EINVAL;
> + }
> +
> + copp = adm_find_copp(adm, port_id, copp_idx);
> + if (IS_ERR_OR_NULL(copp))
> + return -EINVAL;
> +
> + copp->cnt--;
> + if (!copp->cnt) {

Again, this needs some locking.

> + copp_id = copp->id;
> +
> + close.hdr_field = APR_HDR_FIELD(APR_MSG_TYPE_SEQ_CMD,
> + APR_HDR_LEN(APR_HDR_SIZE),
> + APR_PKT_VER);
> + close.pkt_size = sizeof(close);
> + close.src_svc = APR_SVC_ADM;
> + close.src_domain = APR_DOMAIN_APPS;
> + close.src_port = port_id;
> + close.dest_svc = APR_SVC_ADM;
> + close.dest_domain = APR_DOMAIN_ADSP;
> + close.dest_port = copp_id;
> + close.token = port_idx << 16 | copp_idx;
> + close.opcode = ADM_CMD_DEVICE_CLOSE_V5;
> +

Split this out into a separate helper function.

> + ret = apr_send_pkt(adm->apr, (uint32_t *) &close);
> + if (ret < 0) {
> + dev_err(dev, "ADM close failed %d\n", ret);
> + return -EINVAL;
> + }
> +
> + ret = wait_event_timeout(copp->wait, copp->stat >= 0,
> + msecs_to_jiffies(TIMEOUT_MS));
> + if (!ret) {
> + dev_err(dev, "ADM cmd Route timedout for port 0x%x\n",
> + port_id);
> + return -EINVAL;
> + } else if (copp->stat > 0) {
> + dev_err(dev, "DSP returned error[%s]\n",
> + adsp_err_get_err_str(copp->stat));
> + return adsp_err_get_lnx_err_code(copp->stat);
> + }
> +
> + adm_reset_copp(copp);
> + adm_free_copp(adm, copp, port_id);
> + }
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(q6adm_close);
[..]
> +static struct apr_driver qcom_q6adm_driver = {
> + .probe = q6adm_probe,
> + .remove = q6adm_exit,
> + .callback = adm_callback,
> + .id_table = adm_id,
> + .driver = {
> + .name = "qcom-q6adm",
> + },

Indentation.

Regards,
Bjorn

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