[Sound-open-firmware] [PATCH v3] intel-ipc: fix host ring buffer size not page aligned issue

[Keyon Jie]

The host ring buffer size may be not page aligned,
but the last page was utilized by host component
wrongly, which may introduce beating noise.

Here change to correct size for the last element,
which will fix the issue.

Signed-off-by: Keyon Jie <yang.jie at linux.intel.com>
---
 src/ipc/intel-ipc.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/ipc/intel-ipc.c b/src/ipc/intel-ipc.c
index 56bd8ba..e13b541 100644
--- a/src/ipc/intel-ipc.c
+++ b/src/ipc/intel-ipc.c
@@ -175,6 +175,17 @@ static int parse_page_descriptors(struct intel_ipc_data *iipc,
 		host = (struct sof_ipc_comp_host *)&cd->comp;
 	}
 
+	/* the ring size may be not multiple of the page size, the last
+	 * page may be not full used. The used size should be in range
+	 * of (ring->pages - 1, ring->pages] * PAGES.
+	 */
+	if ((ring->size <= HOST_PAGE_SIZE * (ring->pages - 1)) ||
+			(ring->size > HOST_PAGE_SIZE * ring->pages)) {
+		/* error buffer size */
+		trace_ipc_error("eBs");
+		return -EINVAL;
+	}
+
 	for (i = 0; i < ring->pages; i++) {
 
 		idx = (((i << 2) + i)) >> 1;
@@ -192,6 +203,10 @@ static int parse_page_descriptors(struct intel_ipc_data *iipc,
 		else
 			elem.dest = phy_addr;
 
+		/* the last page may be not full used */
+		if (i == (ring->pages - 1))
+			elem.size = ring->size - HOST_PAGE_SIZE * i;
+
 		if (is_trace)
 			err = dma_trace_host_buffer(d, &elem, ring->size);
 		else
-- 
2.11.0