Parse the Root Port ATS Capability Reporting Structure in DMA Remapping
Reporting Structure ACPI table.
Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
---
drivers/pci/dmar.c | 112 ++++++++++++++++++++++++++++++++++++++++--
include/linux/dmar.h | 9 ++++
include/linux/intel-iommu.h | 1 +
3 files changed, 116 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index f5a662a..bd37b3c 100644
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -254,6 +254,84 @@ rmrr_parse_dev(struct dmar_rmrr_unit *rmrru)
}
return ret;
}
+
+static LIST_HEAD(dmar_atsr_units);
+
+static int __init dmar_parse_one_atsr(struct acpi_dmar_header *hdr)
+{
+ struct acpi_dmar_atsr *atsr;
+ struct dmar_atsr_unit *atsru;
+
+ atsr = container_of(hdr, struct acpi_dmar_atsr, header);
+ atsru = kzalloc(sizeof(*atsru), GFP_KERNEL);
+ if (!atsru)
+ return -ENOMEM;
+
+ atsru->hdr = hdr;
+ atsru->include_all = atsr->flags & 0x1;
+
+ list_add(&atsru->list, &dmar_atsr_units);
+
+ return 0;
+}
+
+static int __init atsr_parse_dev(struct dmar_atsr_unit *atsru)
+{
+ int rc;
+ struct acpi_dmar_atsr *atsr;
+
+ if (atsru->include_all)
+ return 0;
+
+ atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header);
+ rc = dmar_parse_dev_scope((void *)(atsr + 1),
+ (void *)atsr + atsr->header.length,
+ &atsru->devices_cnt, &atsru->devices,
+ atsr->segment);
+ if (rc || !atsru->devices_cnt) {
+ list_del(&atsru->list);
+ kfree(atsru);
+ }
+
+ return rc;
+}
+
+int dmar_find_matched_atsr_unit(struct pci_dev *dev)
+{
+ int i;
+ struct pci_bus *bus;
+ struct acpi_dmar_atsr *atsr;
+ struct dmar_atsr_unit *atsru;
+
+ list_for_each_entry(atsru, &dmar_atsr_units, list) {
+ atsr = container_of(atsru->hdr, struct acpi_dmar_atsr, header);
+ if (atsr->segment == pci_domain_nr(dev->bus))
+ goto found;
+ }
+
+ return 0;
+
+found:
+ for (bus = dev->bus; bus; bus = bus->parent) {
+ struct pci_dev *bridge = bus->self;
+
+ if (!bridge || !bridge->is_pcie ||
+ bridge->pcie_type == PCI_EXP_TYPE_PCI_BRIDGE)
+ return 0;
+
+ if (bridge->pcie_type == PCI_EXP_TYPE_ROOT_PORT) {
+ for (i = 0; i < atsru->devices_cnt; i++)
+ if (atsru->devices[i] == bridge)
+ return 1;
+ break;
+ }
+ }
+
+ if (atsru->include_all)
+ return 1;
+
+ return 0;
+}
#endif
static void __init
@@ -261,22 +339,28 @@ dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
{
struct acpi_dmar_hardware_unit *drhd;
struct acpi_dmar_reserved_memory *rmrr;
+ struct acpi_dmar_atsr *atsr;
switch (header->type) {
case ACPI_DMAR_TYPE_HARDWARE_UNIT:
- drhd = (struct acpi_dmar_hardware_unit *)header;
+ drhd = container_of(header, struct acpi_dmar_hardware_unit,
+ header);
printk (KERN_INFO PREFIX
- "DRHD (flags: 0x%08x)base: 0x%016Lx\n",
- drhd->flags, (unsigned long long)drhd->address);
+ "DRHD base: %#016Lx flags: %#x\n",
+ (unsigned long long)drhd->address, drhd->flags);
break;
case ACPI_DMAR_TYPE_RESERVED_MEMORY:
- rmrr = (struct acpi_dmar_reserved_memory *)header;
-
+ rmrr = container_of(header, struct acpi_dmar_reserved_memory,
+ header);
printk (KERN_INFO PREFIX
- "RMRR base: 0x%016Lx end: 0x%016Lx\n",
+ "RMRR base: %#016Lx end: %#016Lx\n",
(unsigned long long)rmrr->base_address,
(unsigned long long)rmrr->end_address);
break;
+ case ACPI_DMAR_TYPE_ATSR:
+ atsr = container_of(header, struct acpi_dmar_atsr, header);
+ printk(KERN_INFO PREFIX "ATSR flags: %#x\n", atsr->flags);
+ break;
}
}
@@ -341,6 +425,11 @@ parse_dmar_table(void)
ret = dmar_parse_one_rmrr(entry_header);
#endif
break;
+ case ACPI_DMAR_TYPE_ATSR:
+#ifdef CONFIG_DMAR
+ ret = dmar_parse_one_atsr(entry_header);
+#endif
+ break;
default:
printk(KERN_WARNING PREFIX
"Unknown DMAR structure type\n");
@@ -409,11 +498,19 @@ int __init dmar_dev_scope_init(void)
#ifdef CONFIG_DMAR
{
struct dmar_rmrr_unit *rmrr, *rmrr_n;
+ struct dmar_atsr_unit *atsr, *atsr_n;
+
list_for_each_entry_safe(rmrr, rmrr_n, &dmar_rmrr_units, list) {
ret = rmrr_parse_dev(rmrr);
if (ret)
return ret;
}
+
+ list_for_each_entry_safe(atsr, atsr_n, &dmar_atsr_units, list) {
+ ret = atsr_parse_dev(atsr);
+ if (ret)
+ return ret;
+ }
}
#endif
@@ -446,6 +543,9 @@ int __init dmar_table_init(void)
#ifdef CONFIG_DMAR
if (list_empty(&dmar_rmrr_units))
printk(KERN_INFO PREFIX "No RMRR found\n");
+
+ if (list_empty(&dmar_atsr_units))
+ printk(KERN_INFO PREFIX "No ATSR found\n");
#endif
#ifdef CONFIG_INTR_REMAP
diff --git a/include/linux/dmar.h b/include/linux/dmar.h
index f284407..d3a1234 100644
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -142,6 +142,15 @@ struct dmar_rmrr_unit {
#define for_each_rmrr_units(rmrr) \
list_for_each_entry(rmrr, &dmar_rmrr_units, list)
+
+struct dmar_atsr_unit {
+ struct list_head list; /* list of ATSR units */
+ struct acpi_dmar_header *hdr; /* ACPI header */
+ struct pci_dev **devices; /* target devices */
+ int devices_cnt; /* target device count */
+ u8 include_all:1; /* include all ports */
+};
+
/* Intel DMAR initialization functions */
extern int intel_iommu_init(void);
#else
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index c4f6c10..5323ad9 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -316,6 +316,7 @@ static inline void __iommu_flush_cache(
}
extern struct dmar_drhd_unit * dmar_find_matched_drhd_unit(struct pci_dev *dev);
+extern int dmar_find_matched_atsr_unit(struct pci_dev *dev);
extern int alloc_iommu(struct dmar_drhd_unit *drhd);
extern void free_iommu(struct intel_iommu *iommu);
--
1.6.1
--
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