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authorHanjun Guo <hanjun.guo@linaro.org>2017-03-07 15:40:05 +0300
committerLorenzo Pieralisi <lorenzo.pieralisi@arm.com>2017-03-30 12:12:40 +0300
commitae7c18380495ac5c14a614fdb6c452c3bf9148ac (patch)
treee6926157d85e0ecbd3c96fc13c603b598660f477 /drivers/acpi/arm64
parent8ca4f1d3fbb85d8d87ca293500a69c3dc901beb9 (diff)
downloadlinux-ae7c18380495ac5c14a614fdb6c452c3bf9148ac.tar.xz
ACPI: platform-msi: retrieve devid from IORT
For devices connecting to an ITS, the devices need to identify themself through a devid; this devid is represented in the IORT table in named component node [1] for platform devices, so this patch adds code that scans the IORT table to retrieve the devices devid. Add an IORT interface to collect ITS devices devid to carry out platform devices MSI mappings with IORT tables. [1]: https://static.docs.arm.com/den0049/b/DEN0049B_IO_Remapping_Table.pdf Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org> [lorenzo.pieralisi@arm.com: rewrote commit log/dropped ITS changes] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Tested-by: Ming Lei <ming.lei@canonical.com> Tested-by: Wei Xu <xuwei5@hisilicon.com> Tested-by: Sinan Kaya <okaya@codeaurora.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Tomasz Nowicki <tn@semihalf.com> Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/acpi/arm64')
-rw-r--r--drivers/acpi/arm64/iort.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index 83cd59dcb8b3..fb95ceb3840d 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -468,6 +468,30 @@ u32 iort_msi_map_rid(struct device *dev, u32 req_id)
}
/**
+ * iort_pmsi_get_dev_id() - Get the device id for a device
+ * @dev: The device for which the mapping is to be done.
+ * @dev_id: The device ID found.
+ *
+ * Returns: 0 for successful find a dev id, -ENODEV on error
+ */
+int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
+{
+ int i;
+ struct acpi_iort_node *node;
+
+ node = iort_find_dev_node(dev);
+ if (!node)
+ return -ENODEV;
+
+ for (i = 0; i < node->mapping_count; i++) {
+ if (iort_node_map_platform_id(node, dev_id, IORT_MSI_TYPE, i))
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
+/**
* iort_dev_find_its_id() - Find the ITS identifier for a device
* @dev: The device.
* @req_id: Device's requester ID