VT-d: parse ATSR in DMA Remapping Reporting Structure

Parse the Root Port ATS Capability Reporting Structure in the DMA
Remapping Reporting Structure ACPI table.

Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
index f23460a..6d7f961 100644 (file)
--- a/drivers/pci/dmar.c
+++ b/drivers/pci/dmar.c
@@ -267,6 +267,84 @@ 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
@@ -274,22 +352,28 @@ 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;
        }
 }
 
@@ -363,6 +447,11 @@ 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");
@@ -431,11 +520,19 @@ 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
 
@@ -468,6 +565,9 @@ 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 e397dc3..7c9a207 100644 (file)
--- a/include/linux/dmar.h
+++ b/include/linux/dmar.h
@@ -185,6 +185,15 @@ 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 29e05a0..0a1939f 100644 (file)
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -331,6 +331,7 @@ 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);