From: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
Introduce per PCI segment device table. All IOMMUs within the segment
will share this device table. This will replace global device
table i.e. amd_iommu_dev_table.
Also introduce helper function to get the device table for the given IOMMU.
Co-developed-by: Vasant Hegde <vasant.he...@amd.com>
Signed-off-by: Vasant Hegde <vasant.he...@amd.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpa...@amd.com>
---
drivers/iommu/amd/amd_iommu.h | 1 +
drivers/iommu/amd/amd_iommu_types.h | 10 ++++++++++
drivers/iommu/amd/init.c | 26 ++++++++++++++++++++++++--
drivers/iommu/amd/iommu.c | 12 ++++++++++++
4 files changed, 47 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index 1ab31074f5b3..885570cd0d77 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -128,4 +128,5 @@ static inline void amd_iommu_apply_ivrs_quirks(void) { }
extern void amd_iommu_domain_set_pgtable(struct protection_domain *domain,
u64 *root, int mode);
+extern struct dev_table_entry *get_dev_table(struct amd_iommu *iommu);
#endif
diff --git a/drivers/iommu/amd/amd_iommu_types.h
b/drivers/iommu/amd/amd_iommu_types.h
index 62442d88978f..404feb7995cc 100644
--- a/drivers/iommu/amd/amd_iommu_types.h
+++ b/drivers/iommu/amd/amd_iommu_types.h
@@ -539,6 +539,16 @@ struct amd_iommu_pci_seg {
/* PCI segment number */
u16 id;
+
+ /*
+ * device table virtual address
+ *
+ * Pointer to the per PCI segment device table.
+ * It is indexed by the PCI device id or the HT unit id and contains
+ * information about the domain the device belongs to as well as the
+ * page table root pointer.
+ */
+ struct dev_table_entry *dev_table;
};
/*
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index e01eae9dcbc1..0fd1071bfc85 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -640,11 +640,29 @@ static int __init find_last_devid_acpi(struct
acpi_table_header *table)
*
* The following functions belong to the code path which parses the ACPI table
* the second time. In this ACPI parsing iteration we allocate IOMMU specific
- * data structures, initialize the device/alias/rlookup table and also
- * basically initialize the hardware.
+ * data structures, initialize the per PCI segment device/alias/rlookup table
+ * and also basically initialize the hardware.
*
****************************************************************************/
+/* Allocate per PCI segment device table */
+static inline int __init alloc_dev_table(struct amd_iommu_pci_seg *pci_seg)
+{
+ pci_seg->dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO |
GFP_DMA32,
+
get_order(dev_table_size));
+ if (!pci_seg->dev_table)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static inline void free_dev_table(struct amd_iommu_pci_seg *pci_seg)
+{
+ free_pages((unsigned long)pci_seg->dev_table,
+ get_order(dev_table_size));
+ pci_seg->dev_table = NULL;
+}
+
/*
* Allocates the command buffer. This buffer is per AMD IOMMU. We can
* write commands to that buffer later and the IOMMU will execute them
@@ -1469,6 +1487,9 @@ static struct amd_iommu_pci_seg *__init
alloc_pci_segment(u16 id)
pci_seg->id = id;
list_add_tail(&pci_seg->list, &amd_iommu_pci_seg_list);
+ if (alloc_dev_table(pci_seg))
+ return NULL;
+
return pci_seg;
}
@@ -1490,6 +1511,7 @@ static void __init free_pci_segment(void)
for_each_pci_segment_safe(pci_seg, next) {
list_del(&pci_seg->list);
+ free_dev_table(pci_seg);
kfree(pci_seg);
}
}
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 7a29e2645dc4..52058c0d4f62 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -134,6 +134,18 @@ static inline int get_device_id(struct device *dev)
return devid;
}
+struct dev_table_entry *get_dev_table(struct amd_iommu *iommu)
+{
+ struct dev_table_entry *dev_table;
+ struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
+
+ BUG_ON(pci_seg == NULL);
+ dev_table = pci_seg->dev_table;
+ BUG_ON(dev_table == NULL);
+
+ return dev_table;
+}
+
static struct protection_domain *to_pdomain(struct iommu_domain *dom)
{
return container_of(dom, struct protection_domain, domain);
--
2.27.0
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
