linux-kernel - [RFC PATCH v3 12/13] drivers: acpi: iort: replace rid map type with type mask

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Date:	Wed, 20 Jul 2016 12:23:34 +0100
From:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:	iommu@...ts.linux-foundation.org
Cc:	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Hanjun Guo <hanjun.guo@...aro.org>,
	Tomasz Nowicki <tn@...ihalf.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <will.deacon@....com>,
	Marc Zyngier <marc.zyngier@....com>,
	Robin Murphy <robin.murphy@....com>,
	Joerg Roedel <joro@...tes.org>, Jon Masters <jcm@...hat.com>,
	Sinan Kaya <okaya@...eaurora.org>, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [RFC PATCH v3 12/13] drivers: acpi: iort: replace rid map type with type mask

IORT tables provide data that allow the kernel to carry out
device ID mappings between endpoints and system components
(eg interrupt controllers, IOMMUs). When the mapping for a
given device ID is carried out, the translation mechanism
is done on a per-subsystem basis rather than a component
subtype (ie the IOMMU kernel layer will look for mappings
from a device to all IORT node types corresponding to IOMMU
components), therefore the corresponding mapping API should
work on a range (ie mask) of IORT node types corresponding
to a common set of components (eg IOMMUs) rather than a
specific node type.

Upgrade the IORT iort_node_map_rid() API to work with a
type mask instead of a single node type so that it can
be used for mappings that span multiple components types
(ie IOMMUs).

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc: Hanjun Guo <hanjun.guo@...aro.org>
Cc: Tomasz Nowicki <tn@...ihalf.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
---
 drivers/acpi/iort.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/iort.c b/drivers/acpi/iort.c
index c91e45d..c116b68 100644
--- a/drivers/acpi/iort.c
+++ b/drivers/acpi/iort.c
@@ -25,6 +25,9 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 
+#define IORT_TYPE_MASK(type)	(1 << (type))
+#define IORT_MSI_TYPE		(1 << ACPI_IORT_NODE_ITS_GROUP)
+
 struct iort_its_msi_chip {
 	struct list_head	list;
 	struct fwnode_handle	*fw_node;
@@ -299,7 +302,7 @@ iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in, u32 *rid_out)
 
 static struct acpi_iort_node *
 iort_node_map_rid(struct acpi_iort_node *node, u32 rid_in,
-		  u32 *rid_out, u8 type)
+		  u32 *rid_out, u8 type_mask)
 {
 	u32 rid = rid_in;
 
@@ -308,7 +311,7 @@ iort_node_map_rid(struct acpi_iort_node *node, u32 rid_in,
 		struct acpi_iort_id_mapping *map;
 		int i;
 
-		if (node->type == type) {
+		if (IORT_TYPE_MASK(node->type) & type_mask) {
 			if (rid_out)
 				*rid_out = rid;
 			return node;
@@ -386,7 +389,7 @@ u32 iort_msi_map_rid(struct device *dev, u32 req_id)
 		return req_id;
 	}
 
-	iort_node_map_rid(node, req_id, &dev_id, ACPI_IORT_NODE_ITS_GROUP);
+	iort_node_map_rid(node, req_id, &dev_id, IORT_MSI_TYPE);
 	return dev_id;
 }
 
@@ -411,7 +414,7 @@ iort_dev_find_its_id(struct device *dev, u32 req_id, unsigned int idx,
 		return -ENXIO;
 	}
 
-	node = iort_node_map_rid(node, req_id, NULL, ACPI_IORT_NODE_ITS_GROUP);
+	node = iort_node_map_rid(node, req_id, NULL, IORT_MSI_TYPE);
 	if (!node) {
 		dev_err(dev, "can't find related ITS node\n");
 		return -ENXIO;
-- 
2.6.4