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ACPI/IORT: Replace rid map type with type mask

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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@arm.com>
Reviewed-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Tomasz Nowicki <tn@semihalf.com>
Acked-by: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Hanjun Guo <hanjun.guo@linaro.org>
Cc: Tomasz Nowicki <tn@semihalf.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Lorenzo Pieralisi 2016-11-21 10:01:46 +00:00 committed by Will Deacon
parent d6fcd3b149
commit ea50b5245b
1 changed files with 7 additions and 4 deletions
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11
drivers/acpi/arm64/iort.c
View file

@ -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;