DT based systems have a generic kernel API to configure IOMMUs
for devices (ie of_iommu_configure()).
On ARM based ACPI systems, the of_iommu_configure() equivalent can
be implemented atop ACPI IORT kernel API, with the corresponding
functions to map device identifiers to IOMMUs and retrieve the
corresponding IOMMU operations necessary for DMA operations set-up.
By relying on the iommu_fwspec generic kernel infrastructure,
implement the IORT based IOMMU configuration for ARM ACPI systems
and hook it up in the ACPI kernel layer that implements DMA
configuration for a device.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
Cc: Hanjun Guo <hanjun....@linaro.org>
Cc: Tomasz Nowicki <t...@semihalf.com>
Cc: "Rafael J. Wysocki" <r...@rjwysocki.net>
---
drivers/acpi/iort.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++
drivers/acpi/scan.c | 7 +++++-
include/linux/iort.h | 4 ++++
3 files changed, 74 insertions(+), 1 deletion(-)
diff --git a/drivers/acpi/iort.c b/drivers/acpi/iort.c
index c116b68..a12a4ff 100644
--- a/drivers/acpi/iort.c
+++ b/drivers/acpi/iort.c
@@ -18,6 +18,7 @@
#define pr_fmt(fmt) "ACPI: IORT: " fmt
+#include <linux/iommu-fwspec.h>
#include <linux/iort.h>
#include <linux/kernel.h>
#include <linux/list.h>
@@ -27,6 +28,8 @@
#define IORT_TYPE_MASK(type) (1 << (type))
#define IORT_MSI_TYPE (1 << ACPI_IORT_NODE_ITS_GROUP)
+#define IORT_IOMMU_TYPE ((1 << ACPI_IORT_NODE_SMMU) | \
+ (1 << ACPI_IORT_NODE_SMMU_V3))
struct iort_its_msi_chip {
struct list_head list;
@@ -458,6 +461,67 @@ iort_get_device_domain(struct device *dev, u32 req_id)
return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI);
}
+static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
+{
+ u32 *rid = data;
+
+ *rid = alias;
+ return 0;
+}
+
+static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
+ struct fwnode_handle *fwnode)
+{
+ int ret = iommu_fwspec_init(dev, fwnode);
+
+ if (!ret)
+ ret = iommu_fwspec_add_ids(dev, &streamid, 1);
+
+ return 0;
+}
+
+/**
+ * iort_iommu_configure - Set-up IOMMU configuration for a device.
+ *
+ * @dev: device to configure
+ *
+ * Returns: iommu_ops pointer on configuration success
+ * NULL on configuration failure
+ */
+const struct iommu_ops *iort_iommu_configure(struct device *dev)
+{
+ struct acpi_iort_node *node, *parent;
+ struct fwnode_handle *iort_fwnode;
+ u32 rid = 0, devid = 0;
+
+ if (dev_is_pci(dev)) {
+ struct pci_bus *bus = to_pci_dev(dev)->bus;
+
+ pci_for_each_dma_alias(to_pci_dev(dev), __get_pci_rid,
+ &rid);
+
+ node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
+ iort_match_node_callback, &bus->dev);
+ } else {
+ node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
+ iort_match_node_callback, dev);
+ }
+
+ if (!node)
+ return NULL;
+
+ parent = iort_node_map_rid(node, rid, &devid, IORT_IOMMU_TYPE);
+ if (parent) {
+ iort_fwnode = iort_get_fwnode(parent);
+ if (iort_fwnode) {
+ arm_smmu_iort_xlate(dev, devid, iort_fwnode);
+ return fwspec_iommu_get_ops(iort_fwnode);
+ }
+ }
+
+ return NULL;
+}
+
static void acpi_smmu_v3_register_irq(int hwirq, const char *name,
struct resource *res)
{
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index b4b9064..de28825 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -7,6 +7,7 @@
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/acpi.h>
+#include <linux/iort.h>
#include <linux/signal.h>
#include <linux/kthread.h>
#include <linux/dmi.h>
@@ -1365,11 +1366,15 @@ enum dev_dma_attr acpi_get_dma_attr(struct acpi_device
*adev)
*/
void acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
{
+ const struct iommu_ops *iommu;
+
+ iommu = iort_iommu_configure(dev);
+
/*
* Assume dma valid range starts at 0 and covers the whole
* coherent_dma_mask.
*/
- arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, NULL,
+ arch_setup_dma_ops(dev, 0, dev->coherent_dma_mask + 1, iommu,
attr == DEV_DMA_COHERENT);
}
diff --git a/include/linux/iort.h b/include/linux/iort.h
index 18e6836..bbe08ef 100644
--- a/include/linux/iort.h
+++ b/include/linux/iort.h
@@ -34,6 +34,8 @@ struct irq_domain *iort_get_device_domain(struct device *dev,
u32 req_id);
/* IOMMU interface */
int iort_add_smmu_platform_device(struct fwnode_handle *fwnode,
struct acpi_iort_node *node);
+
+const struct iommu_ops *iort_iommu_configure(struct device *dev);
#else
static inline bool iort_node_match(u8 type) { return false; }
static inline void iort_table_detect(void) { }
@@ -48,6 +50,8 @@ iort_add_smmu_platform_device(struct fwnode_handle *fwnode,
{
return -ENODEV;
}
+static inline const struct iommu_ops *
+iort_iommu_configure(struct device *dev) { return NULL; }
#endif
#define IORT_ACPI_DECLARE(name, table_id, fn) \
--
2.6.4
