cnss2: Add support to determine Audio shared IOMMU group

Add support to determine if CNSS and Audio share
IOMMU group and do iommu_map/unmap only in the
case of distinct iommu groups for direct link
datapath.

CRs-Fixed: 3714345
Change-Id: I6134e9d732052fd492e0f20d538e86ba96c14c4d

cnss2/main.c

@@ -443,6 +443,51 @@ static int cnss_get_audio_iommu_domain(struct cnss_plat_data *plat_priv)
 	return 0;
 }
 
+bool cnss_get_audio_shared_iommu_group_cap(struct device *dev)
+{
+	struct cnss_plat_data *plat_priv = cnss_bus_dev_to_plat_priv(dev);
+	struct device_node *audio_ion_node;
+	struct device_node *cnss_iommu_group_node;
+	struct device_node *audio_iommu_group_node;
+
+	if (!plat_priv)
+		return false;
+
+	audio_ion_node = of_find_compatible_node(NULL, NULL,
+						 "qcom,msm-audio-ion");
+	if (!audio_ion_node) {
+		cnss_pr_err("Unable to get Audio ion node");
+		return false;
+	}
+
+	audio_iommu_group_node = of_parse_phandle(audio_ion_node,
+						  "qcom,iommu-group", 0);
+	of_node_put(audio_ion_node);
+	if (!audio_iommu_group_node) {
+		cnss_pr_err("Unable to get audio iommu group phandle");
+		return false;
+	}
+	of_node_put(audio_iommu_group_node);
+
+	cnss_iommu_group_node = of_parse_phandle(dev->of_node,
+						 "qcom,iommu-group", 0);
+	if (!cnss_iommu_group_node) {
+		cnss_pr_err("Unable to get cnss iommu group phandle");
+		return false;
+	}
+	of_node_put(cnss_iommu_group_node);
+
+	if (cnss_iommu_group_node == audio_iommu_group_node) {
+		plat_priv->is_audio_shared_iommu_group = true;
+		cnss_pr_info("CNSS and Audio share IOMMU group");
+	} else {
+		cnss_pr_info("CNSS and Audio do not share IOMMU group");
+	}
+
+	return plat_priv->is_audio_shared_iommu_group;
+}
+EXPORT_SYMBOL(cnss_get_audio_shared_iommu_group_cap);
+
 int cnss_set_feature_list(struct cnss_plat_data *plat_priv,
 			  enum cnss_feature_v01 feature)
 {
@@ -752,6 +797,9 @@ int cnss_audio_smmu_map(struct device *dev, phys_addr_t paddr,
 	if (!plat_priv->audio_iommu_domain)
 		return -EINVAL;
 
+	if (plat_priv->is_audio_shared_iommu_group)
+		return 0;
+
 	page_offset = iova & (PAGE_SIZE - 1);
 	if (page_offset + size > PAGE_SIZE)
 		size += PAGE_SIZE;
@@ -770,10 +818,8 @@ void cnss_audio_smmu_unmap(struct device *dev, dma_addr_t iova, size_t size)
 	struct cnss_plat_data *plat_priv = cnss_bus_dev_to_plat_priv(dev);
 	uint32_t page_offset;
 
-	if (!plat_priv)
-		return;
-
-	if (!plat_priv->audio_iommu_domain)
+	if (!plat_priv || !plat_priv->audio_iommu_domain ||
+	    plat_priv->is_audio_shared_iommu_group)
 		return;
 
 	page_offset = iova & (PAGE_SIZE - 1);

cnss2/main.h

@@ -613,6 +613,7 @@ struct cnss_plat_data {
 	u64 fw_caps;
 	u8 pcie_gen_speed;
 	struct iommu_domain *audio_iommu_domain;
+	bool is_audio_shared_iommu_group;
 	struct cnss_dms_data dms;
 	int power_up_error;
 	u32 hw_trc_override;

inc/cnss2.h

@@ -436,6 +436,7 @@ extern int cnss_get_mem_seg_count(enum cnss_remote_mem_type type, u32 *seg);
 extern int cnss_get_mem_segment_info(enum cnss_remote_mem_type type,
 				     struct cnss_mem_segment segment[],
 				     u32 segment_count);
+extern bool cnss_get_audio_shared_iommu_group_cap(struct device *dev);
 extern int cnss_audio_smmu_map(struct device *dev, phys_addr_t paddr,
 			       dma_addr_t iova, size_t size);
 extern void cnss_audio_smmu_unmap(struct device *dev, dma_addr_t iova,