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linux_dsm_epyc7002/include/linux/dmar.h
Weidong Han f007e99c8e Intel-IOMMU, intr-remap: source-id checking 
To support domain-isolation usages, the platform hardware must be
capable of uniquely identifying the requestor (source-id) for each
interrupt message. Without source-id checking for interrupt remapping
, a rouge guest/VM with assigned devices can launch interrupt attacks
to bring down anothe guest/VM or the VMM itself.

This patch adds source-id checking for interrupt remapping, and then
really isolates interrupts for guests/VMs with assigned devices.

Because PCI subsystem is not initialized yet when set up IOAPIC
entries, use read_pci_config_byte to access PCI config space directly.

Signed-off-by: Weidong Han <weidong.han@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
2009-06-23 22:09:17 +01:00

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/*
* Copyright (c) 2006, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Copyright (C) Ashok Raj <ashok.raj@intel.com>
* Copyright (C) Shaohua Li <shaohua.li@intel.com>
*/
#ifndef __DMAR_H__
#define __DMAR_H__
#include <linux/acpi.h>
#include <linux/types.h>
#include <linux/msi.h>
#include <linux/irqreturn.h>
struct intel_iommu;
#if defined(CONFIG_DMAR) || defined(CONFIG_INTR_REMAP)
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 */
int devices_cnt; /* target device count */
u16 segment; /* PCI domain */
u8 ignored:1; /* ignore drhd */
u8 include_all:1;
struct intel_iommu *iommu;
};
extern struct list_head dmar_drhd_units;
#define for_each_drhd_unit(drhd) \
list_for_each_entry(drhd, &dmar_drhd_units, list)
#define for_each_active_iommu(i, drhd) \
list_for_each_entry(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) \
if (i=drhd->iommu, 0) {} else
extern int dmar_table_init(void);
extern int dmar_dev_scope_init(void);
/* Intel IOMMU detection */
extern void detect_intel_iommu(void);
extern int enable_drhd_fault_handling(void);
extern int parse_ioapics_under_ir(void);
extern int alloc_iommu(struct dmar_drhd_unit *);
#else
static inline void detect_intel_iommu(void)
{
return;
}
static inline int dmar_table_init(void)
{
return -ENODEV;
}
static inline int enable_drhd_fault_handling(void)
{
return -1;
}
#endif /* !CONFIG_DMAR && !CONFIG_INTR_REMAP */
struct irte {
union {
struct {
__u64 present : 1,
fpd : 1,
dst_mode : 1,
redir_hint : 1,
trigger_mode : 1,
dlvry_mode : 3,
avail : 4,
__reserved_1 : 4,
vector : 8,
__reserved_2 : 8,
dest_id : 32;
};
__u64 low;
};
union {
struct {
__u64 sid : 16,
sq : 2,
svt : 2,
__reserved_3 : 44;
};
__u64 high;
};
};
#ifdef CONFIG_INTR_REMAP
extern int intr_remapping_enabled;
extern int intr_remapping_supported(void);
extern int enable_intr_remapping(int);
extern void disable_intr_remapping(void);
extern int reenable_intr_remapping(int);
extern int get_irte(int irq, struct irte *entry);
extern int modify_irte(int irq, struct irte *irte_modified);
extern int alloc_irte(struct intel_iommu *iommu, int irq, u16 count);
extern int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index,
u16 sub_handle);
extern int map_irq_to_irte_handle(int irq, u16 *sub_handle);
extern int clear_irte_irq(int irq, struct intel_iommu *iommu, u16 index);
extern int flush_irte(int irq);
extern int free_irte(int irq);
extern int irq_remapped(int irq);
extern struct intel_iommu *map_dev_to_ir(struct pci_dev *dev);
extern struct intel_iommu *map_ioapic_to_ir(int apic);
extern int set_ioapic_sid(struct irte *irte, int apic);
extern int set_msi_sid(struct irte *irte, struct pci_dev *dev);
#else
static inline int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
{
return -1;
}
static inline int modify_irte(int irq, struct irte *irte_modified)
{
return -1;
}
static inline int free_irte(int irq)
{
return -1;
}
static inline int map_irq_to_irte_handle(int irq, u16 *sub_handle)
{
return -1;
}
static inline int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index,
u16 sub_handle)
{
return -1;
}
static inline struct intel_iommu *map_dev_to_ir(struct pci_dev *dev)
{
return NULL;
}
static inline struct intel_iommu *map_ioapic_to_ir(int apic)
{
return NULL;
}
static inline int set_ioapic_sid(struct irte *irte, int apic)
{
return 0;
}
static inline int set_msi_sid(struct irte *irte, struct pci_dev *dev)
{
return 0;
}
#define irq_remapped(irq) (0)
#define enable_intr_remapping(mode) (-1)
#define disable_intr_remapping() (0)
#define reenable_intr_remapping(mode) (0)
#define intr_remapping_enabled (0)
#endif
/* Can't use the common MSI interrupt functions
* since DMAR is not a pci device
*/
extern void dmar_msi_unmask(unsigned int irq);
extern void dmar_msi_mask(unsigned int irq);
extern void dmar_msi_read(int irq, struct msi_msg *msg);
extern void dmar_msi_write(int irq, struct msi_msg *msg);
extern int dmar_set_interrupt(struct intel_iommu *iommu);
extern irqreturn_t dmar_fault(int irq, void *dev_id);
extern int arch_setup_dmar_msi(unsigned int irq);
#ifdef CONFIG_DMAR
extern int iommu_detected, no_iommu;
extern struct list_head dmar_rmrr_units;
struct dmar_rmrr_unit {
struct list_head list; /* list of rmrr units */
struct acpi_dmar_header *hdr; /* ACPI header */
u64 base_address; /* reserved base address*/
u64 end_address; /* reserved end address */
struct pci_dev **devices; /* target devices */
int devices_cnt; /* target device count */
};
#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
static inline int intel_iommu_init(void)
{
#ifdef CONFIG_INTR_REMAP
return dmar_dev_scope_init();
#else
return -ENODEV;
#endif
}
#endif /* !CONFIG_DMAR */
#endif /* __DMAR_H__ */
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