Re: [PATCH v2 05/16] ASoC: qcom: audioreach: add basic pkt alloc support

Thanks for review Pierre,

On 14/07/2021 17:30, Pierre-Louis Bossart wrote:

quoted

diff --git a/sound/soc/qcom/Kconfig b/sound/soc/qcom/Kconfig
index cc7c1de2f1d9..721ea56b2cb5 100644
--- a/sound/soc/qcom/Kconfig
+++ b/sound/soc/qcom/Kconfig

@@ -103,6 +103,12 @@ config SND_SOC_QDSP6
  	 audio drivers. This includes q6asm, q6adm,
  	 q6afe interfaces to DSP using apr.
  
+config SND_SOC_QCOM_AUDIOREACH
+	tristate "SoC ALSA audio drives for Qualcomm AUDIOREACH"

typo: drivers?

Will fix all the typos in next spin.

quoted

+static void *__audioreach_alloc_pkt(int payload_size, uint32_t opcode,
+				     uint32_t token, uint32_t src_port,
+				     uint32_t dest_port, bool has_cmd_hdr)
+{
+	struct apm_cmd_header *cmd_header;
+	struct gpr_pkt *pkt;
+	void *p;
+	int pkt_size = GPR_HDR_SIZE + payload_size;
+
+	if (has_cmd_hdr)
+		pkt_size += APM_CMD_HDR_SIZE;
+
+	p = kzalloc(pkt_size, GFP_ATOMIC);

is GFP_ATOMIC required? it's the same question really than my earlier one on spinlock_irqsave, it's rather hard to figure out in what context this code will run.

I had some spinlocks in this patch for compress offload cases, so had to 
make it ATOMIC. having said that we could avoid ATOMIC here.

quoted

+	if (!p)
+		return ERR_PTR(-ENOMEM);
+
+	pkt = p;
+	pkt->hdr.version = GPR_PKT_VER;
+	pkt->hdr.hdr_size = 6;

magic number. looks like a missing macro...

There is already a macro for this, GPR_PKT_HEADER_WORD_SIZE I should 
have used it.

quoted

+	pkt->hdr.pkt_size = pkt_size;
+	pkt->hdr.dest_port = dest_port;
+	pkt->hdr.src_port = src_port;
+
+	pkt->hdr.dest_domain = GPR_DOMAIN_ID_ADSP;
+	pkt->hdr.src_domain = GPR_DOMAIN_ID_APPS;
+	pkt->hdr.token = token;
+	pkt->hdr.opcode = opcode;
+
+	if (has_cmd_hdr) {
+		p = p + GPR_HDR_SIZE;
+		cmd_header = p;
+		cmd_header->payload_size = payload_size;
+	}
+
+	return pkt;
+}