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Subject[RFC PATCH 02/10] ACPI: platform-msi: retrieve dev id from IORT
Date
From: Hanjun Guo <hanjun.guo@linaro.org>

For devices connecting to ITS, it needs dev id to identify
itself, and this dev id is represented in the IORT table in
named componant node [1] for platform devices, so in this
patch we will scan the IORT to retrieve device's dev id.

Introduce iort_pmsi_get_dev_id() with pointer dev passed
in for that purpose.

[1]: https://static.docs.arm.com/den0049/b/DEN0049B_IO_Remapping_Table.pdf

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
---
drivers/acpi/iort.c | 27 +++++++++++++++++++++++++++
drivers/irqchip/irq-gic-v3-its-platform-msi.c | 3 ++-
include/linux/iort.h | 7 +++++++
3 files changed, 36 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/iort.c b/drivers/acpi/iort.c
index 7795f69..cbace4d6 100644
--- a/drivers/acpi/iort.c
+++ b/drivers/acpi/iort.c
@@ -310,6 +310,33 @@ 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, errors otherwise
+ */
+int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
+{
+ struct acpi_iort_node *node;
+
+ if (!iort_table)
+ return -ENODEV;
+
+ node = iort_find_dev_node(dev);
+ if (!node) {
+ dev_err(dev, "can't find related IORT node\n");
+ return -ENODEV;
+ }
+
+ /* For a platform device, we don't need a req_id */
+ if( !iort_node_map_rid(node, 0, dev_id, ACPI_IORT_NODE_ITS_GROUP))
+ return -ENODEV;
+
+ return 0;
+}
+
+/**
* iort_dev_find_its_id() - Find the ITS identifier for a device
* @dev: The device.
* @idx: Index of the ITS identifier list.
diff --git a/drivers/irqchip/irq-gic-v3-its-platform-msi.c b/drivers/irqchip/irq-gic-v3-its-platform-msi.c
index 3c94278..a0cb38f 100644
--- a/drivers/irqchip/irq-gic-v3-its-platform-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-platform-msi.c
@@ -56,7 +56,8 @@ static int its_pmsi_prepare(struct irq_domain *domain, struct device *dev,

msi_info = msi_get_domain_info(domain->parent);

- ret = of_pmsi_get_dev_id(domain, dev, &dev_id);
+ ret = dev->of_node ? of_pmsi_get_dev_id(domain, dev, &dev_id) :
+ iort_pmsi_get_dev_id(dev, &dev_id);
if (ret)
return ret;

diff --git a/include/linux/iort.h b/include/linux/iort.h
index d7daba1..f747821 100644
--- a/include/linux/iort.h
+++ b/include/linux/iort.h
@@ -29,11 +29,18 @@ struct fwnode_handle *iort_find_domain_token(int trans_id);
#ifdef CONFIG_IORT_TABLE
void iort_table_detect(void);
u32 iort_msi_map_rid(struct device *dev, u32 req_id);
+int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
#else
static inline void iort_table_detect(void) { }
static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id)
{ return req_id; }
+
+static inline int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
+{
+ return -ENODEV;
+}
+
static inline struct irq_domain *
iort_get_device_domain(struct device *dev, u32 req_id) { return NULL; }
#endif
--
1.7.12.4
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