diff options
Diffstat (limited to 'include/linux/dmar.h')
| -rw-r--r-- | include/linux/dmar.h | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/include/linux/dmar.h b/include/linux/dmar.h index 8f06a0135a84..bedebab934b4 100644 --- a/include/linux/dmar.h +++ b/include/linux/dmar.h @@ -26,6 +26,7 @@ #include <linux/msi.h> #include <linux/irqreturn.h> #include <linux/rwsem.h> +#include <linux/rcupdate.h> struct acpi_dmar_header; @@ -41,7 +42,7 @@ struct dmar_drhd_unit { struct list_head list; /* list of drhd units */ struct acpi_dmar_header *hdr; /* ACPI header */ u64 reg_base_addr; /* register base address*/ - struct pci_dev **devices; /* target device array */ + struct pci_dev __rcu **devices;/* target device array */ int devices_cnt; /* target device count */ u16 segment; /* PCI domain */ u8 ignored:1; /* ignore drhd */ @@ -53,22 +54,31 @@ extern struct rw_semaphore dmar_global_lock; extern struct list_head dmar_drhd_units; #define for_each_drhd_unit(drhd) \ - list_for_each_entry(drhd, &dmar_drhd_units, list) + list_for_each_entry_rcu(drhd, &dmar_drhd_units, list) #define for_each_active_drhd_unit(drhd) \ - list_for_each_entry(drhd, &dmar_drhd_units, list) \ + list_for_each_entry_rcu(drhd, &dmar_drhd_units, list) \ if (drhd->ignored) {} else #define for_each_active_iommu(i, drhd) \ - list_for_each_entry(drhd, &dmar_drhd_units, list) \ + list_for_each_entry_rcu(drhd, &dmar_drhd_units, list) \ if (i=drhd->iommu, drhd->ignored) {} else #define for_each_iommu(i, drhd) \ - list_for_each_entry(drhd, &dmar_drhd_units, list) \ + list_for_each_entry_rcu(drhd, &dmar_drhd_units, list) \ if (i=drhd->iommu, 0) {} else +static inline bool dmar_rcu_check(void) +{ + return rwsem_is_locked(&dmar_global_lock) || + system_state == SYSTEM_BOOTING; +} + +#define dmar_rcu_dereference(p) rcu_dereference_check((p), dmar_rcu_check()) + #define for_each_dev_scope(a, c, p, d) \ - for ((p) = 0; ((d) = (p) < (c) ? (a)[(p)] : NULL, (p) < (c)); (p)++) + for ((p) = 0; ((d) = (p) < (c) ? dmar_rcu_dereference((a)[(p)]) : \ + NULL, (p) < (c)); (p)++) #define for_each_active_dev_scope(a, c, p, d) \ for_each_dev_scope((a), (c), (p), (d)) if (!(d)) { continue; } else @@ -78,6 +88,7 @@ extern int dmar_dev_scope_init(void); extern int dmar_parse_dev_scope(void *start, void *end, int *cnt, struct pci_dev ***devices, u16 segment); extern void *dmar_alloc_dev_scope(void *start, void *end, int *cnt); +extern void dmar_free_dev_scope(struct pci_dev __rcu ***devices, int *cnt); extern void dmar_free_dev_scope(struct pci_dev ***devices, int *cnt); /* Intel IOMMU detection */ |