ASoC: SOF: ext_manifest: parse windows

The window description can be extracted from the extended manifest
content. This information known at build time does not need to be
provided in a mailbox.

Signed-off-by: Karol Trzcinski <karolx.trzcinski@linux.intel.com>
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20200520165911.21696-5-kai.vehmanen@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

include/sound/sof/ext_manifest.h

@@ -58,6 +58,7 @@ struct sof_ext_man_header {
 /* Extended manifest elements types */
 enum sof_ext_man_elem_type {
 	SOF_EXT_MAN_ELEM_FW_VERSION		= 0,
+	SOF_EXT_MAN_ELEM_WINDOW			= SOF_IPC_EXT_WINDOW,
 };
 
 /* extended manifest element header */
@@ -76,4 +77,11 @@ struct sof_ext_man_fw_version {
 	uint32_t flags;
 } __packed;
 
+/* extended data memory windows for IPC, trace and debug */
+struct sof_ext_man_window {
+	struct sof_ext_man_elem_header hdr;
+	/* use sof_ipc struct because of code re-use */
+	struct sof_ipc_window ipc_window;
+} __packed;
+
 #endif /* __SOF_FIRMWARE_EXT_MANIFEST_H__ */

sound/soc/sof/loader.c

@@ -20,13 +20,21 @@ static int get_ext_windows(struct snd_sof_dev *sdev,
 {
 	const struct sof_ipc_window *w =
 		container_of(ext_hdr, struct sof_ipc_window, ext_hdr);
+	size_t w_size = struct_size(w, window, w->num_windows);
 
 	if (w->num_windows == 0 || w->num_windows > SOF_IPC_MAX_ELEMS)
 		return -EINVAL;
 
+	if (sdev->info_window) {
+		if (memcmp(sdev->info_window, w, w_size)) {
+			dev_err(sdev->dev, "error: mismatch between window descriptor from extended manifest and mailbox");
+			return -EINVAL;
+		}
+		return 0;
+	}
+
 	/* keep a local copy of the data */
-	sdev->info_window = kmemdup(w, struct_size(w, window, w->num_windows),
-				    GFP_KERNEL);
+	sdev->info_window = kmemdup(w, w_size, GFP_KERNEL);
 	if (!sdev->info_window)
 		return -ENOMEM;
 
@@ -140,6 +148,16 @@ static int ext_man_get_fw_version(struct snd_sof_dev *sdev,
 	return snd_sof_ipc_valid(sdev);
 }
 
+static int ext_man_get_windows(struct snd_sof_dev *sdev,
+			       const struct sof_ext_man_elem_header *hdr)
+{
+	const struct sof_ext_man_window *w;
+
+	w = container_of(hdr, struct sof_ext_man_window, hdr);
+
+	return get_ext_windows(sdev, &w->ipc_window.ext_hdr);
+}
+
 static ssize_t snd_sof_ext_man_size(const struct firmware *fw)
 {
 	const struct sof_ext_man_header *head;
@@ -213,6 +231,9 @@ static int snd_sof_fw_ext_man_parse(struct snd_sof_dev *sdev,
 		case SOF_EXT_MAN_ELEM_FW_VERSION:
 			ret = ext_man_get_fw_version(sdev, elem_hdr);
 			break;
+		case SOF_EXT_MAN_ELEM_WINDOW:
+			ret = ext_man_get_windows(sdev, elem_hdr);
+			break;
 		default:
 			dev_warn(sdev->dev, "warning: unknown sof_ext_man header type %d size 0x%X\n",
 				 elem_hdr->type, elem_hdr->size);