linux-kernel - [PATCH v8 14/16] drivers: acpi: iort: replace rid map type with type mask

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Message-Id: <20161116152936.22955-15-lorenzo.pieralisi@arm.com>
Date:   Wed, 16 Nov 2016 15:29:34 +0000
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>,
        Eric Auger <eric.auger@...hat.com>,
        Sinan Kaya <okaya@...eaurora.org>,
        Nate Watterson <nwatters@...eaurora.org>,
        Prem Mallappa <prem.mallappa@...adcom.com>,
        Dennis Chen <dennis.chen@....com>, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v8 14/16] 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>
Reviewed-by: Tomasz Nowicki <tn@...ihalf.com>
Tested-by: Hanjun Guo <hanjun.guo@...aro.org>
Tested-by: Tomasz Nowicki <tn@...ihalf.com>
Cc: Hanjun Guo <hanjun.guo@...aro.org>
Cc: Tomasz Nowicki <tn@...ihalf.com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>
---
 drivers/acpi/arm64/iort.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 4708806..62057c6 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -26,6 +26,9 @@
 #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;
@@ -317,7 +320,7 @@ static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
 
 static struct acpi_iort_node *iort_node_map_rid(struct acpi_iort_node *node,
 						u32 rid_in, u32 *rid_out,
-						u8 type)
+						u8 type_mask)
 {
 	u32 rid = rid_in;
 
@@ -326,7 +329,7 @@ static struct acpi_iort_node *iort_node_map_rid(struct acpi_iort_node *node,
 		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;
@@ -399,7 +402,7 @@ u32 iort_msi_map_rid(struct device *dev, u32 req_id)
 	if (!node)
 		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;
 }
 
@@ -421,7 +424,7 @@ static int iort_dev_find_its_id(struct device *dev, u32 req_id,
 	if (!node)
 		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)
 		return -ENXIO;
 
-- 
2.10.0