Merge "soc: qcom: hab: add dts parsing into hab driver"

Documentation/devicetree/bindings/soc/qcom/hab.txt

@@ -0,0 +1,41 @@
+* HAB
+
+HAB(Hypervisor ABstraction) is meant to be a cross-platform abstraction layer
+for utilizing the underlying hypervisor system. This API can be accessed from
+both user and kernel sides.
+The intended users of this are primarily the multimedia drivers who want to
+communicate with the host OS to use the multimedia hardware.
+
+Required properties:
+- compatible: Must be "qcom,hab"
+- vmid: the local VM's ID
+  It should be unique in a system, and host's ID should be 0. Here is an
+  example for a system as qvm host + agl gvm + android gvm, and such below
+  setting is proper,
+    qvm host's vmid: 0
+    agl gvm's vmid: 1
+    android gvm's vmid: 2
+- mmid group properties:
+  - grp-start-id: mmid group starting ID, eg, 100 is for MM_AUD_1~4
+  - role: the local role of this group, and must be "fe" or "be"
+  - remote-vmids: When the local role is "fe", this is to tell which VM is the
+    relevant BE. When it is "be", this is to tell which VMs it will support as
+    BE.
+
+Example:
+	qcom,hab {
+		compatible = "qcom,hab";
+		vmid = <2>;
+
+		mmid100: mmid-grp@100 {
+			grp-start-id = <100>;
+			role = "fe";
+			remote-vmids = <0>;
+		};
+
+		mmid200: mmid-grp@200 {
+			grp-start-id = <200>;
+			role = "fe";
+			remote-vmids = <0>;
+		};
+	}

drivers/soc/qcom/hab/hab.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -687,9 +687,12 @@ int do_hab_parse(void)
 	memset(&hab_driver.settings, HABCFG_VMID_INVALID,
 				sizeof(hab_driver.settings));
 
-	pr_debug("prepare default gvm 2 settings...\n");
+	result = hab_parse(&hab_driver.settings);
+	if (result) {
+		pr_warn("hab_parse failed and use the default settings\n");
 		fill_default_gvm_settings(&hab_driver.settings, 2,
 					MM_AUD_START, MM_ID_MAX);
+	}
 
 	/* now generate hab pchan list */
 	result  = hab_generate_pchan_list(&hab_driver.settings);

drivers/soc/qcom/hab/hab_parser.c

@@ -1,4 +1,4 @@
-/* Copyright (c) 2017, The Linux Foundation. All rights reserved.
+/* Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
@@ -12,6 +12,7 @@
  */
 
 #include "hab.h"
+#include <linux/of.h>
 
 /*
  * set valid mmid value in tbl to show this is valid entry. All inputs here are
@@ -63,3 +64,98 @@ int fill_default_gvm_settings(struct local_vmid *settings, int vmid_local,
 	return fill_vmid_mmid_tbl(settings->vmid_mmid_list, 0, 1,
 		mmid_start/100, (mmid_end-mmid_start)/100+1, HABCFG_BE_FALSE);
 }
+
+static int hab_parse_dt(struct local_vmid *settings)
+{
+	int result, i;
+	struct device_node *hab_node = NULL;
+	struct device_node *mmid_grp_node = NULL;
+	const char *role = NULL;
+	int tmp = -1, vmids_num;
+	u32 vmids[16];
+	int32_t grp_start_id, be;
+
+	/* parse device tree*/
+	pr_debug("parsing hab node in device tree...\n");
+	hab_node = of_find_compatible_node(NULL, NULL, "qcom,hab");
+	if (!hab_node) {
+		pr_err("no hab device tree node\n");
+		return -ENODEV;
+	}
+
+	/* read the local vmid of this VM, like 0 for host, 1 for AGL GVM */
+	result = of_property_read_u32(hab_node, "vmid", &tmp);
+	if (result) {
+		pr_err("failed to read local vmid, result = %d\n", result);
+		return result;
+	}
+
+	pr_debug("local vmid = %d\n", tmp);
+	settings->self = tmp;
+
+	for_each_child_of_node(hab_node, mmid_grp_node) {
+		/* read the group starting id */
+		result = of_property_read_u32(mmid_grp_node,
+				"grp-start-id", &tmp);
+		if (result) {
+			pr_err("failed to read grp-start-id, result = %d\n",
+				result);
+			return result;
+		}
+
+		pr_debug("grp-start-id = %d\n", tmp);
+		grp_start_id = tmp;
+
+		/* read the role(fe/be) of these pchans in this mmid group */
+		result = of_property_read_string(mmid_grp_node, "role", &role);
+		if (result) {
+			pr_err("failed to get role, result = %d\n", result);
+			return result;
+		}
+
+		pr_debug("local role of this mmid group is %s\n", role);
+		if (!strcmp(role, "be"))
+			be = 1;
+		else
+			be = 0;
+
+		/* read the remote vmids for these pchans in this mmid group */
+		vmids_num = of_property_count_elems_of_size(mmid_grp_node,
+					"remote-vmids", sizeof(u32));
+
+		result = of_property_read_u32_array(mmid_grp_node,
+					"remote-vmids", vmids, vmids_num);
+		if (result) {
+			pr_err("failed to read remote-vmids, result = %d\n",
+				result);
+			return result;
+		}
+
+		for (i = 0; i < vmids_num; i++) {
+			pr_debug("vmids_num = %d, vmids[%d] = %d\n",
+				vmids_num, i, vmids[i]);
+
+			result = fill_vmid_mmid_tbl(
+					settings->vmid_mmid_list,
+					vmids[i], 1,
+					grp_start_id/100, 1, be);
+			if (result) {
+				pr_err("fill_vmid_mmid_tbl failed\n");
+				return result;
+			}
+		}
+
+	}
+
+	dump_settings(settings);
+	return 0;
+}
+
+int hab_parse(struct local_vmid *settings)
+{
+	int ret;
+
+	ret = hab_parse_dt(settings);
+
+	return ret;
+}