[PATCH v8 10/15] ACPI: platform-msi: retrieve dev id from IORT

From: Hanjun Guo
Date: Wed Jan 18 2017 - 08:09:57 EST


From: Hanjun Guo <hanjun.guo@xxxxxxxxxx>

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

With the preparation of iort_node_map_platform_id(), a new API
iort_pmsi_get_dev_id() is introduced for that purpose, call it in
its_pmsi_prepare() to make retrieving dev id ACPI aware.

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

Signed-off-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx>
Tested-by: Ming Lei <ming.lei@xxxxxxxxxxxxx>
Tested-by: Wei Xu <xuwei5@xxxxxxxxxxxxx>
Tested-by: Sinan Kaya <okaya@xxxxxxxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Cc: Tomasz Nowicki <tn@xxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
drivers/acpi/arm64/iort.c | 24 ++++++++++++++++++++++++
drivers/irqchip/irq-gic-v3-its-platform-msi.c | 3 ++-
include/linux/acpi_iort.h | 5 +++++
3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index dacf5e1..9aebb14 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
diff --git a/drivers/irqchip/irq-gic-v3-its-platform-msi.c b/drivers/irqchip/irq-gic-v3-its-platform-msi.c
index e4ba9f4..e801fc0 100644
--- a/drivers/irqchip/irq-gic-v3-its-platform-msi.c
+++ b/drivers/irqchip/irq-gic-v3-its-platform-msi.c
@@ -57,7 +57,8 @@ 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/acpi_iort.h b/include/linux/acpi_iort.h
index 77e0809..d074c77 100644
--- a/include/linux/acpi_iort.h
+++ b/include/linux/acpi_iort.h
@@ -34,6 +34,7 @@
bool iort_node_match(u8 type);
u32 iort_msi_map_rid(struct device *dev, u32 req_id);
struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
+int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
/* IOMMU interface */
void iort_set_dma_mask(struct device *dev);
const struct iommu_ops *iort_iommu_configure(struct device *dev);
@@ -45,6 +46,10 @@ static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id)
static inline struct irq_domain *iort_get_device_domain(struct device *dev,
u32 req_id)
{ return NULL; }
+
+static inline int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
+{ return -ENODEV; }
+
/* IOMMU interface */
static inline void iort_set_dma_mask(struct device *dev) { }
static inline
--
1.7.12.4