[PATCH 6.18 125/752] ASoC: SOF: ipc4: Support for sending payload along with LARGE_CONFIG_GET

Sasha Levin
2026-02-28T17:49:54Z

From: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

[ Upstream commit d96cb0b86d6e8bbbbfa425771606f6c1aebc318e ]

There are message types when we would need to send a payload along with
the LARGE_CONFIG_GET message to provide information to the firmware on
what data is requested.
Such cases are the ALSA Kcontrol related messages when the high level
param_id tells only the type of the control, but the ID/index of the exact
control is specified in the payload area.

The caller must place the payload for TX before calling the set_get_data()
and this payload will be sent alongside with the message to the firmware.

The data area will be overwritten by the received data from firmware.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Seppo Ingalsuo <seppo.ingalsuo@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://patch.msgid.link/20251217143945.2667-7-peter.ujfalusi@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
sound/soc/sof/ipc4.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 42 insertions(+), 2 deletions(-)

diff --git a/sound/soc/sof/ipc4.c b/sound/soc/sof/ipc4.c
index a4a090e6724a6..20d723f48fff0 100644
--- a/sound/soc/sof/ipc4.c
+++ b/sound/soc/sof/ipc4.c
@@ -15,6 +15,7 @@
#include "sof-audio.h"
#include "ipc4-fw-reg.h"
#include "ipc4-priv.h"
+#include "ipc4-topology.h"
#include "ipc4-telemetry.h"
#include "ops.h"

@@ -433,6 +434,23 @@ static int sof_ipc4_tx_msg(struct snd_sof_dev *sdev, void *msg_data, size_t msg_
return ret;
}

+static bool sof_ipc4_tx_payload_for_get_data(struct sof_ipc4_msg *tx)
+{
+ /*
+ * Messages that require TX payload with LARGE_CONFIG_GET.
+ * The TX payload is placed into the IPC message data section by caller,
+ * which needs to be copied to temporary buffer since the received data
+ * will overwrite it.
+ */
+ switch (tx->extension & SOF_IPC4_MOD_EXT_MSG_PARAM_ID_MASK) {
+ case SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_SWITCH_CONTROL_PARAM_ID):
+ case SOF_IPC4_MOD_EXT_MSG_PARAM_ID(SOF_IPC4_ENUM_CONTROL_PARAM_ID):
+ return true;
+ default:
+ return false;
+ }
+}
+
static int sof_ipc4_set_get_data(struct snd_sof_dev *sdev, void *data,
size_t payload_bytes, bool set)
{
@@ -444,6 +462,8 @@ static int sof_ipc4_set_get_data(struct snd_sof_dev *sdev, void *data,
struct sof_ipc4_msg tx = {{ 0 }};
struct sof_ipc4_msg rx = {{ 0 }};
size_t remaining = payload_bytes;
+ void *tx_payload_for_get = NULL;
+ size_t tx_data_size = 0;
size_t offset = 0;
size_t chunk_size;
int ret;
@@ -469,10 +489,20 @@ static int sof_ipc4_set_get_data(struct snd_sof_dev *sdev, void *data,

tx.extension |= SOF_IPC4_MOD_EXT_MSG_FIRST_BLOCK(1);

+ if (sof_ipc4_tx_payload_for_get_data(&tx)) {
+ tx_data_size = min(ipc4_msg->data_size, payload_limit);
+ tx_payload_for_get = kmemdup(ipc4_msg->data_ptr, tx_data_size,
+ GFP_KERNEL);
+ if (!tx_payload_for_get)
+ return -ENOMEM;
+ }
+
/* ensure the DSP is in D0i0 before sending IPC */
ret = snd_sof_dsp_set_power_state(sdev, &target_state);
- if (ret < 0)
+ if (ret < 0) {
+ kfree(tx_payload_for_get);
return ret;
+ }

/* Serialise IPC TX */
mutex_lock(&sdev->ipc->tx_mutex);
@@ -506,7 +536,15 @@ static int sof_ipc4_set_get_data(struct snd_sof_dev *sdev, void *data,
rx.data_size = chunk_size;
rx.data_ptr = ipc4_msg->data_ptr + offset;

- tx_size = 0;
+ if (tx_payload_for_get) {
+ tx_size = tx_data_size;
+ tx.data_size = tx_size;
+ tx.data_ptr = tx_payload_for_get;
+ } else {
+ tx_size = 0;
+ tx.data_size = 0;
+ tx.data_ptr = NULL;
+ }
rx_size = chunk_size;
}

@@ -553,6 +591,8 @@ static int sof_ipc4_set_get_data(struct snd_sof_dev *sdev, void *data,

mutex_unlock(&sdev->ipc->tx_mutex);

+ kfree(tx_payload_for_get);
+
return ret;
}

--
2.51.0