Extract the code that sets up the IOMMU infrastructure from IORT, since
it can be reused by VIOT. Move it one level up into a new
acpi_iommu_configure_id() function, which calls the IORT parsing
function which in turn calls the acpi_iommu_fwspec_init() helper.
Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
---
include/acpi/acpi_bus.h | 3 ++
include/linux/acpi_iort.h | 8 ++---
drivers/acpi/arm64/iort.c | 75 +++++----------------------------------
drivers/acpi/scan.c | 55 +++++++++++++++++++++++++++-
4 files changed, 69 insertions(+), 72 deletions(-)
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 3a82faac5767..41f092a269f6 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -588,6 +588,9 @@ struct acpi_pci_root {
bool acpi_dma_supported(struct acpi_device *adev);
enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev);
+int acpi_iommu_fwspec_init(struct device *dev, u32 id,
+ struct fwnode_handle *fwnode,
+ const struct iommu_ops *ops);
int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
u64 *size);
int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
index f7f054833afd..f1f0842a2cb2 100644
--- a/include/linux/acpi_iort.h
+++ b/include/linux/acpi_iort.h
@@ -35,8 +35,7 @@ void acpi_configure_pmsi_domain(struct device *dev);
int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
/* IOMMU interface */
int iort_dma_get_ranges(struct device *dev, u64 *size);
-const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
- const u32 *id_in);
+int iort_iommu_configure_id(struct device *dev, const u32 *id_in);
int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head);
phys_addr_t acpi_iort_dma_get_max_cpu_address(void);
#else
@@ -50,9 +49,8 @@ static inline void acpi_configure_pmsi_domain(struct device *dev) { }
/* IOMMU interface */
static inline int iort_dma_get_ranges(struct device *dev, u64 *size)
{ return -ENODEV; }
-static inline const struct iommu_ops *iort_iommu_configure_id(
- struct device *dev, const u32 *id_in)
-{ return NULL; }
+static inline int iort_iommu_configure_id(struct device *dev, const u32 *id_in)
+{ return -ENODEV; }
static inline
int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
{ return 0; }
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index a940be1cf2af..b5b021e064b6 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -806,23 +806,6 @@ static struct acpi_iort_node *iort_get_msi_resv_iommu(struct device *dev)
return NULL;
}
-static inline const struct iommu_ops *iort_fwspec_iommu_ops(struct device *dev)
-{
- struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
-
- return (fwspec && fwspec->ops) ? fwspec->ops : NULL;
-}
-
-static inline int iort_add_device_replay(struct device *dev)
-{
- int err = 0;
-
- if (dev->bus && !device_iommu_mapped(dev))
- err = iommu_probe_device(dev);
-
- return err;
-}
-
/**
* iort_iommu_msi_get_resv_regions - Reserved region driver helper
* @dev: Device from iommu_get_resv_regions()
@@ -900,18 +883,6 @@ static inline bool iort_iommu_driver_enabled(u8 type)
}
}
-static int arm_smmu_iort_xlate(struct device *dev, u32 streamid,
- struct fwnode_handle *fwnode,
- const struct iommu_ops *ops)
-{
- int ret = iommu_fwspec_init(dev, fwnode, ops);
-
- if (!ret)
- ret = iommu_fwspec_add_ids(dev, &streamid, 1);
-
- return ret;
-}
-
static bool iort_pci_rc_supports_ats(struct acpi_iort_node *node)
{
struct acpi_iort_root_complex *pci_rc;
@@ -946,7 +917,7 @@ static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node,
return iort_iommu_driver_enabled(node->type) ?
-EPROBE_DEFER : -ENODEV;
- return arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops);
+ return acpi_iommu_fwspec_init(dev, streamid, iort_fwnode, ops);
}
struct iort_pci_alias_info {
@@ -1020,24 +991,14 @@ static int iort_nc_iommu_map_id(struct device *dev,
* @dev: device to configure
* @id_in: optional input id const value pointer
*
- * Returns: iommu_ops pointer on configuration success
- * NULL on configuration failure
+ * Returns: 0 on success, <0 on failure
*/
-const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
- const u32 *id_in)
+int iort_iommu_configure_id(struct device *dev, const u32 *id_in)
{
struct acpi_iort_node *node;
- const struct iommu_ops *ops;
+ const struct iommu_ops *ops = NULL;
int err = -ENODEV;
- /*
- * If we already translated the fwspec there
- * is nothing left to do, return the iommu_ops.
- */
- ops = iort_fwspec_iommu_ops(dev);
- if (ops)
- return ops;
-
if (dev_is_pci(dev)) {
struct iommu_fwspec *fwspec;
struct pci_bus *bus = to_pci_dev(dev)->bus;
@@ -1046,7 +1007,7 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
iort_match_node_callback, &bus->dev);
if (!node)
- return NULL;
+ return -ENODEV;
info.node = node;
err = pci_for_each_dma_alias(to_pci_dev(dev),
@@ -1059,7 +1020,7 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
iort_match_node_callback, dev);
if (!node)
- return NULL;
+ return -ENODEV;
err = id_in ? iort_nc_iommu_map_id(dev, node, id_in) :
iort_nc_iommu_map(dev, node);
@@ -1068,32 +1029,14 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
iort_named_component_init(dev, node);
}
- /*
- * If we have reason to believe the IOMMU driver missed the initial
- * add_device callback for dev, replay it to get things in order.
- */
- if (!err) {
- ops = iort_fwspec_iommu_ops(dev);
- err = iort_add_device_replay(dev);
- }
-
- /* Ignore all other errors apart from EPROBE_DEFER */
- if (err == -EPROBE_DEFER) {
- ops = ERR_PTR(err);
- } else if (err) {
- dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
- ops = NULL;
- }
-
- return ops;
+ return err;
}
#else
int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
{ return 0; }
-const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
- const u32 *input_id)
-{ return NULL; }
+int iort_iommu_configure_id(struct device *dev, const u32 *input_id)
+{ return -ENODEV; }
#endif
static int nc_dma_get_range(struct device *dev, u64 *size)
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index ea613df8f913..696b81432ae7 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -9,6 +9,7 @@
#include <linux/kernel.h>
#include <linux/acpi.h>
#include <linux/acpi_iort.h>
+#include <linux/iommu.h>
#include <linux/signal.h>
#include <linux/kthread.h>
#include <linux/dmi.h>
@@ -1520,6 +1521,58 @@ int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
return ret >= 0 ? 0 : ret;
}
+int acpi_iommu_fwspec_init(struct device *dev, u32 id,
+ struct fwnode_handle *fwnode,
+ const struct iommu_ops *ops)
+{
+ int ret = iommu_fwspec_init(dev, fwnode, ops);
+
+ if (!ret)
+ ret = iommu_fwspec_add_ids(dev, &id, 1);
+
+ return ret;
+}
+
+static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev)
+{
+ struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
+
+ return fwspec ? fwspec->ops : NULL;
+}
+
+static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev,
+ const u32 *id_in)
+{
+ int err;
+ const struct iommu_ops *ops;
+
+ /*
+ * If we already translated the fwspec there is nothing left to do,
+ * return the iommu_ops.
+ */
+ ops = acpi_iommu_fwspec_ops(dev);
+ if (ops)
+ return ops;
+
+ err = iort_iommu_configure_id(dev, id_in);
+
+ /*
+ * If we have reason to believe the IOMMU driver missed the initial
+ * add_device callback for dev, replay it to get things in order.
+ */
+ if (!err && dev->bus && !device_iommu_mapped(dev))
+ err = iommu_probe_device(dev);
+
+ /* Ignore all other errors apart from EPROBE_DEFER */
+ if (err == -EPROBE_DEFER) {
+ return ERR_PTR(err);
+ } else if (err) {
+ dev_dbg(dev, "Adding to IOMMU failed: %d\n", err);
+ return NULL;
+ }
+ return acpi_iommu_fwspec_ops(dev);
+}
+
/**
* acpi_dma_configure_id - Set-up DMA configuration for the device.
* @dev: The pointer to the device
@@ -1539,7 +1592,7 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
acpi_arch_dma_setup(dev, &dma_addr, &size);
- iommu = iort_iommu_configure_id(dev, input_id);
+ iommu = acpi_iommu_configure_id(dev, input_id);
if (PTR_ERR(iommu) == -EPROBE_DEFER)
return -EPROBE_DEFER;
--
2.31.1
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