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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/firmware/arm_scmi/shmem.c
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@@ -26,7 +26,7 @@
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 #define SCMI_SHMEM_FLAG_INTR_ENABLED	BIT(0)
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 	__le32 length;
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 	__le32 msg_header;
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-	u8 msg_payload[0];
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+	u8 msg_payload[];
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 };
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 void shmem_tx_prepare(struct scmi_shared_mem __iomem *shmem,
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@@ -67,6 +67,21 @@
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 	memcpy_fromio(xfer->rx.buf, shmem->msg_payload + 4, xfer->rx.len);
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 }
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+void shmem_fetch_notification(struct scmi_shared_mem __iomem *shmem,
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+			      size_t max_len, struct scmi_xfer *xfer)
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+{
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+	/* Skip only the length of header in shmem area i.e 4 bytes */
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+	xfer->rx.len = min_t(size_t, max_len, ioread32(&shmem->length) - 4);
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+
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+	/* Take a copy to the rx buffer.. */
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+	memcpy_fromio(xfer->rx.buf, shmem->msg_payload, xfer->rx.len);
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+}
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+
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+void shmem_clear_channel(struct scmi_shared_mem __iomem *shmem)
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+{
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+	iowrite32(SCMI_SHMEM_CHAN_STAT_CHANNEL_FREE, &shmem->channel_status);
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+}
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+
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 bool shmem_poll_done(struct scmi_shared_mem __iomem *shmem,
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 		     struct scmi_xfer *xfer)
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 {