2 * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
3 * Author: Joerg Roedel <joerg.roedel@amd.com>
4 * Leo Duran <leo.duran@amd.com>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 #include <linux/pci.h>
21 #include <linux/acpi.h>
22 #include <linux/list.h>
23 #include <linux/slab.h>
24 #include <linux/syscore_ops.h>
25 #include <linux/interrupt.h>
26 #include <linux/msi.h>
27 #include <linux/amd-iommu.h>
28 #include <linux/export.h>
29 #include <linux/acpi.h>
30 #include <acpi/acpi.h>
31 #include <asm/pci-direct.h>
32 #include <asm/iommu.h>
34 #include <asm/x86_init.h>
35 #include <asm/iommu_table.h>
37 #include "amd_iommu_proto.h"
38 #include "amd_iommu_types.h"
41 * definitions for the ACPI scanning code
43 #define IVRS_HEADER_LENGTH 48
45 #define ACPI_IVHD_TYPE 0x10
46 #define ACPI_IVMD_TYPE_ALL 0x20
47 #define ACPI_IVMD_TYPE 0x21
48 #define ACPI_IVMD_TYPE_RANGE 0x22
50 #define IVHD_DEV_ALL 0x01
51 #define IVHD_DEV_SELECT 0x02
52 #define IVHD_DEV_SELECT_RANGE_START 0x03
53 #define IVHD_DEV_RANGE_END 0x04
54 #define IVHD_DEV_ALIAS 0x42
55 #define IVHD_DEV_ALIAS_RANGE 0x43
56 #define IVHD_DEV_EXT_SELECT 0x46
57 #define IVHD_DEV_EXT_SELECT_RANGE 0x47
59 #define IVHD_FLAG_HT_TUN_EN_MASK 0x01
60 #define IVHD_FLAG_PASSPW_EN_MASK 0x02
61 #define IVHD_FLAG_RESPASSPW_EN_MASK 0x04
62 #define IVHD_FLAG_ISOC_EN_MASK 0x08
64 #define IVMD_FLAG_EXCL_RANGE 0x08
65 #define IVMD_FLAG_UNITY_MAP 0x01
67 #define ACPI_DEVFLAG_INITPASS 0x01
68 #define ACPI_DEVFLAG_EXTINT 0x02
69 #define ACPI_DEVFLAG_NMI 0x04
70 #define ACPI_DEVFLAG_SYSMGT1 0x10
71 #define ACPI_DEVFLAG_SYSMGT2 0x20
72 #define ACPI_DEVFLAG_LINT0 0x40
73 #define ACPI_DEVFLAG_LINT1 0x80
74 #define ACPI_DEVFLAG_ATSDIS 0x10000000
77 * ACPI table definitions
79 * These data structures are laid over the table to parse the important values
84 * structure describing one IOMMU in the ACPI table. Typically followed by one
85 * or more ivhd_entrys.
97 } __attribute__((packed));
100 * A device entry describing which devices a specific IOMMU translates and
101 * which requestor ids they use.
108 } __attribute__((packed));
111 * An AMD IOMMU memory definition structure. It defines things like exclusion
112 * ranges for devices and regions that should be unity mapped.
123 } __attribute__((packed));
127 static bool amd_iommu_detected;
128 static bool __initdata amd_iommu_disabled;
130 u16 amd_iommu_last_bdf; /* largest PCI device id we have
132 LIST_HEAD(amd_iommu_unity_map); /* a list of required unity mappings
134 u32 amd_iommu_unmap_flush; /* if true, flush on every unmap */
136 LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the
139 /* Array to assign indices to IOMMUs*/
140 struct amd_iommu *amd_iommus[MAX_IOMMUS];
141 int amd_iommus_present;
143 /* IOMMUs have a non-present cache? */
144 bool amd_iommu_np_cache __read_mostly;
145 bool amd_iommu_iotlb_sup __read_mostly = true;
147 u32 amd_iommu_max_pasids __read_mostly = ~0;
149 bool amd_iommu_v2_present __read_mostly;
151 bool amd_iommu_force_isolation __read_mostly;
154 * List of protection domains - used during resume
156 LIST_HEAD(amd_iommu_pd_list);
157 spinlock_t amd_iommu_pd_lock;
160 * Pointer to the device table which is shared by all AMD IOMMUs
161 * it is indexed by the PCI device id or the HT unit id and contains
162 * information about the domain the device belongs to as well as the
163 * page table root pointer.
165 struct dev_table_entry *amd_iommu_dev_table;
168 * The alias table is a driver specific data structure which contains the
169 * mappings of the PCI device ids to the actual requestor ids on the IOMMU.
170 * More than one device can share the same requestor id.
172 u16 *amd_iommu_alias_table;
175 * The rlookup table is used to find the IOMMU which is responsible
176 * for a specific device. It is also indexed by the PCI device id.
178 struct amd_iommu **amd_iommu_rlookup_table;
181 * AMD IOMMU allows up to 2^16 differend protection domains. This is a bitmap
182 * to know which ones are already in use.
184 unsigned long *amd_iommu_pd_alloc_bitmap;
186 static u32 dev_table_size; /* size of the device table */
187 static u32 alias_table_size; /* size of the alias table */
188 static u32 rlookup_table_size; /* size if the rlookup table */
190 static int amd_iommu_enable_interrupts(void);
192 static inline void update_last_devid(u16 devid)
194 if (devid > amd_iommu_last_bdf)
195 amd_iommu_last_bdf = devid;
198 static inline unsigned long tbl_size(int entry_size)
200 unsigned shift = PAGE_SHIFT +
201 get_order(((int)amd_iommu_last_bdf + 1) * entry_size);
206 /* Access to l1 and l2 indexed register spaces */
208 static u32 iommu_read_l1(struct amd_iommu *iommu, u16 l1, u8 address)
212 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
213 pci_read_config_dword(iommu->dev, 0xfc, &val);
217 static void iommu_write_l1(struct amd_iommu *iommu, u16 l1, u8 address, u32 val)
219 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16 | 1 << 31));
220 pci_write_config_dword(iommu->dev, 0xfc, val);
221 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
224 static u32 iommu_read_l2(struct amd_iommu *iommu, u8 address)
228 pci_write_config_dword(iommu->dev, 0xf0, address);
229 pci_read_config_dword(iommu->dev, 0xf4, &val);
233 static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val)
235 pci_write_config_dword(iommu->dev, 0xf0, (address | 1 << 8));
236 pci_write_config_dword(iommu->dev, 0xf4, val);
239 /****************************************************************************
241 * AMD IOMMU MMIO register space handling functions
243 * These functions are used to program the IOMMU device registers in
244 * MMIO space required for that driver.
246 ****************************************************************************/
249 * This function set the exclusion range in the IOMMU. DMA accesses to the
250 * exclusion range are passed through untranslated
252 static void iommu_set_exclusion_range(struct amd_iommu *iommu)
254 u64 start = iommu->exclusion_start & PAGE_MASK;
255 u64 limit = (start + iommu->exclusion_length) & PAGE_MASK;
258 if (!iommu->exclusion_start)
261 entry = start | MMIO_EXCL_ENABLE_MASK;
262 memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
263 &entry, sizeof(entry));
266 memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
267 &entry, sizeof(entry));
270 /* Programs the physical address of the device table into the IOMMU hardware */
271 static void iommu_set_device_table(struct amd_iommu *iommu)
275 BUG_ON(iommu->mmio_base == NULL);
277 entry = virt_to_phys(amd_iommu_dev_table);
278 entry |= (dev_table_size >> 12) - 1;
279 memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET,
280 &entry, sizeof(entry));
283 /* Generic functions to enable/disable certain features of the IOMMU. */
284 static void iommu_feature_enable(struct amd_iommu *iommu, u8 bit)
288 ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
290 writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
293 static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
297 ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
299 writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
302 static void iommu_set_inv_tlb_timeout(struct amd_iommu *iommu, int timeout)
306 ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
307 ctrl &= ~CTRL_INV_TO_MASK;
308 ctrl |= (timeout << CONTROL_INV_TIMEOUT) & CTRL_INV_TO_MASK;
309 writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
312 /* Function to enable the hardware */
313 static void iommu_enable(struct amd_iommu *iommu)
315 iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
318 static void iommu_disable(struct amd_iommu *iommu)
320 /* Disable command buffer */
321 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
323 /* Disable event logging and event interrupts */
324 iommu_feature_disable(iommu, CONTROL_EVT_INT_EN);
325 iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
327 /* Disable IOMMU hardware itself */
328 iommu_feature_disable(iommu, CONTROL_IOMMU_EN);
332 * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in
333 * the system has one.
335 static u8 __iomem * __init iommu_map_mmio_space(u64 address)
337 if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu")) {
338 pr_err("AMD-Vi: Can not reserve memory region %llx for mmio\n",
340 pr_err("AMD-Vi: This is a BIOS bug. Please contact your hardware vendor\n");
344 return (u8 __iomem *)ioremap_nocache(address, MMIO_REGION_LENGTH);
347 static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu)
349 if (iommu->mmio_base)
350 iounmap(iommu->mmio_base);
351 release_mem_region(iommu->mmio_phys, MMIO_REGION_LENGTH);
354 /****************************************************************************
356 * The functions below belong to the first pass of AMD IOMMU ACPI table
357 * parsing. In this pass we try to find out the highest device id this
358 * code has to handle. Upon this information the size of the shared data
359 * structures is determined later.
361 ****************************************************************************/
364 * This function calculates the length of a given IVHD entry
366 static inline int ivhd_entry_length(u8 *ivhd)
368 return 0x04 << (*ivhd >> 6);
372 * This function reads the last device id the IOMMU has to handle from the PCI
373 * capability header for this IOMMU
375 static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr)
379 cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);
380 update_last_devid(calc_devid(MMIO_GET_BUS(cap), MMIO_GET_LD(cap)));
386 * After reading the highest device id from the IOMMU PCI capability header
387 * this function looks if there is a higher device id defined in the ACPI table
389 static int __init find_last_devid_from_ivhd(struct ivhd_header *h)
391 u8 *p = (void *)h, *end = (void *)h;
392 struct ivhd_entry *dev;
397 find_last_devid_on_pci(PCI_BUS(h->devid),
403 dev = (struct ivhd_entry *)p;
405 case IVHD_DEV_SELECT:
406 case IVHD_DEV_RANGE_END:
408 case IVHD_DEV_EXT_SELECT:
409 /* all the above subfield types refer to device ids */
410 update_last_devid(dev->devid);
415 p += ivhd_entry_length(p);
424 * Iterate over all IVHD entries in the ACPI table and find the highest device
425 * id which we need to handle. This is the first of three functions which parse
426 * the ACPI table. So we check the checksum here.
428 static int __init find_last_devid_acpi(struct acpi_table_header *table)
431 u8 checksum = 0, *p = (u8 *)table, *end = (u8 *)table;
432 struct ivhd_header *h;
435 * Validate checksum here so we don't need to do it when
436 * we actually parse the table
438 for (i = 0; i < table->length; ++i)
441 /* ACPI table corrupt */
444 p += IVRS_HEADER_LENGTH;
446 end += table->length;
448 h = (struct ivhd_header *)p;
451 find_last_devid_from_ivhd(h);
463 /****************************************************************************
465 * The following functions belong the the code path which parses the ACPI table
466 * the second time. In this ACPI parsing iteration we allocate IOMMU specific
467 * data structures, initialize the device/alias/rlookup table and also
468 * basically initialize the hardware.
470 ****************************************************************************/
473 * Allocates the command buffer. This buffer is per AMD IOMMU. We can
474 * write commands to that buffer later and the IOMMU will execute them
477 static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
479 u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
480 get_order(CMD_BUFFER_SIZE));
485 iommu->cmd_buf_size = CMD_BUFFER_SIZE | CMD_BUFFER_UNINITIALIZED;
491 * This function resets the command buffer if the IOMMU stopped fetching
494 void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu)
496 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
498 writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
499 writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
501 iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
505 * This function writes the command buffer address to the hardware and
508 static void iommu_enable_command_buffer(struct amd_iommu *iommu)
512 BUG_ON(iommu->cmd_buf == NULL);
514 entry = (u64)virt_to_phys(iommu->cmd_buf);
515 entry |= MMIO_CMD_SIZE_512;
517 memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
518 &entry, sizeof(entry));
520 amd_iommu_reset_cmd_buffer(iommu);
521 iommu->cmd_buf_size &= ~(CMD_BUFFER_UNINITIALIZED);
524 static void __init free_command_buffer(struct amd_iommu *iommu)
526 free_pages((unsigned long)iommu->cmd_buf,
527 get_order(iommu->cmd_buf_size & ~(CMD_BUFFER_UNINITIALIZED)));
530 /* allocates the memory where the IOMMU will log its events to */
531 static u8 * __init alloc_event_buffer(struct amd_iommu *iommu)
533 iommu->evt_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
534 get_order(EVT_BUFFER_SIZE));
536 if (iommu->evt_buf == NULL)
539 iommu->evt_buf_size = EVT_BUFFER_SIZE;
541 return iommu->evt_buf;
544 static void iommu_enable_event_buffer(struct amd_iommu *iommu)
548 BUG_ON(iommu->evt_buf == NULL);
550 entry = (u64)virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK;
552 memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
553 &entry, sizeof(entry));
555 /* set head and tail to zero manually */
556 writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
557 writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
559 iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
562 static void __init free_event_buffer(struct amd_iommu *iommu)
564 free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE));
567 /* allocates the memory where the IOMMU will log its events to */
568 static u8 * __init alloc_ppr_log(struct amd_iommu *iommu)
570 iommu->ppr_log = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
571 get_order(PPR_LOG_SIZE));
573 if (iommu->ppr_log == NULL)
576 return iommu->ppr_log;
579 static void iommu_enable_ppr_log(struct amd_iommu *iommu)
583 if (iommu->ppr_log == NULL)
586 entry = (u64)virt_to_phys(iommu->ppr_log) | PPR_LOG_SIZE_512;
588 memcpy_toio(iommu->mmio_base + MMIO_PPR_LOG_OFFSET,
589 &entry, sizeof(entry));
591 /* set head and tail to zero manually */
592 writel(0x00, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
593 writel(0x00, iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
595 iommu_feature_enable(iommu, CONTROL_PPFLOG_EN);
596 iommu_feature_enable(iommu, CONTROL_PPR_EN);
599 static void __init free_ppr_log(struct amd_iommu *iommu)
601 if (iommu->ppr_log == NULL)
604 free_pages((unsigned long)iommu->ppr_log, get_order(PPR_LOG_SIZE));
607 static void iommu_enable_gt(struct amd_iommu *iommu)
609 if (!iommu_feature(iommu, FEATURE_GT))
612 iommu_feature_enable(iommu, CONTROL_GT_EN);
615 /* sets a specific bit in the device table entry. */
616 static void set_dev_entry_bit(u16 devid, u8 bit)
618 int i = (bit >> 6) & 0x03;
619 int _bit = bit & 0x3f;
621 amd_iommu_dev_table[devid].data[i] |= (1UL << _bit);
624 static int get_dev_entry_bit(u16 devid, u8 bit)
626 int i = (bit >> 6) & 0x03;
627 int _bit = bit & 0x3f;
629 return (amd_iommu_dev_table[devid].data[i] & (1UL << _bit)) >> _bit;
633 void amd_iommu_apply_erratum_63(u16 devid)
637 sysmgt = get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1) |
638 (get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2) << 1);
641 set_dev_entry_bit(devid, DEV_ENTRY_IW);
644 /* Writes the specific IOMMU for a device into the rlookup table */
645 static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid)
647 amd_iommu_rlookup_table[devid] = iommu;
651 * This function takes the device specific flags read from the ACPI
652 * table and sets up the device table entry with that information
654 static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
655 u16 devid, u32 flags, u32 ext_flags)
657 if (flags & ACPI_DEVFLAG_INITPASS)
658 set_dev_entry_bit(devid, DEV_ENTRY_INIT_PASS);
659 if (flags & ACPI_DEVFLAG_EXTINT)
660 set_dev_entry_bit(devid, DEV_ENTRY_EINT_PASS);
661 if (flags & ACPI_DEVFLAG_NMI)
662 set_dev_entry_bit(devid, DEV_ENTRY_NMI_PASS);
663 if (flags & ACPI_DEVFLAG_SYSMGT1)
664 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1);
665 if (flags & ACPI_DEVFLAG_SYSMGT2)
666 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2);
667 if (flags & ACPI_DEVFLAG_LINT0)
668 set_dev_entry_bit(devid, DEV_ENTRY_LINT0_PASS);
669 if (flags & ACPI_DEVFLAG_LINT1)
670 set_dev_entry_bit(devid, DEV_ENTRY_LINT1_PASS);
672 amd_iommu_apply_erratum_63(devid);
674 set_iommu_for_device(iommu, devid);
678 * Reads the device exclusion range from ACPI and initialize IOMMU with
681 static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
683 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
685 if (!(m->flags & IVMD_FLAG_EXCL_RANGE))
690 * We only can configure exclusion ranges per IOMMU, not
691 * per device. But we can enable the exclusion range per
692 * device. This is done here
694 set_dev_entry_bit(m->devid, DEV_ENTRY_EX);
695 iommu->exclusion_start = m->range_start;
696 iommu->exclusion_length = m->range_length;
701 * Takes a pointer to an AMD IOMMU entry in the ACPI table and
702 * initializes the hardware and our data structures with it.
704 static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
705 struct ivhd_header *h)
708 u8 *end = p, flags = 0;
709 u16 devid = 0, devid_start = 0, devid_to = 0;
710 u32 dev_i, ext_flags = 0;
712 struct ivhd_entry *e;
715 * First save the recommended feature enable bits from ACPI
717 iommu->acpi_flags = h->flags;
720 * Done. Now parse the device entries
722 p += sizeof(struct ivhd_header);
727 e = (struct ivhd_entry *)p;
731 DUMP_printk(" DEV_ALL\t\t\t first devid: %02x:%02x.%x"
732 " last device %02x:%02x.%x flags: %02x\n",
733 PCI_BUS(iommu->first_device),
734 PCI_SLOT(iommu->first_device),
735 PCI_FUNC(iommu->first_device),
736 PCI_BUS(iommu->last_device),
737 PCI_SLOT(iommu->last_device),
738 PCI_FUNC(iommu->last_device),
741 for (dev_i = iommu->first_device;
742 dev_i <= iommu->last_device; ++dev_i)
743 set_dev_entry_from_acpi(iommu, dev_i,
746 case IVHD_DEV_SELECT:
748 DUMP_printk(" DEV_SELECT\t\t\t devid: %02x:%02x.%x "
756 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
758 case IVHD_DEV_SELECT_RANGE_START:
760 DUMP_printk(" DEV_SELECT_RANGE_START\t "
761 "devid: %02x:%02x.%x flags: %02x\n",
767 devid_start = e->devid;
774 DUMP_printk(" DEV_ALIAS\t\t\t devid: %02x:%02x.%x "
775 "flags: %02x devid_to: %02x:%02x.%x\n",
780 PCI_BUS(e->ext >> 8),
781 PCI_SLOT(e->ext >> 8),
782 PCI_FUNC(e->ext >> 8));
785 devid_to = e->ext >> 8;
786 set_dev_entry_from_acpi(iommu, devid , e->flags, 0);
787 set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0);
788 amd_iommu_alias_table[devid] = devid_to;
790 case IVHD_DEV_ALIAS_RANGE:
792 DUMP_printk(" DEV_ALIAS_RANGE\t\t "
793 "devid: %02x:%02x.%x flags: %02x "
794 "devid_to: %02x:%02x.%x\n",
799 PCI_BUS(e->ext >> 8),
800 PCI_SLOT(e->ext >> 8),
801 PCI_FUNC(e->ext >> 8));
803 devid_start = e->devid;
805 devid_to = e->ext >> 8;
809 case IVHD_DEV_EXT_SELECT:
811 DUMP_printk(" DEV_EXT_SELECT\t\t devid: %02x:%02x.%x "
812 "flags: %02x ext: %08x\n",
819 set_dev_entry_from_acpi(iommu, devid, e->flags,
822 case IVHD_DEV_EXT_SELECT_RANGE:
824 DUMP_printk(" DEV_EXT_SELECT_RANGE\t devid: "
825 "%02x:%02x.%x flags: %02x ext: %08x\n",
831 devid_start = e->devid;
836 case IVHD_DEV_RANGE_END:
838 DUMP_printk(" DEV_RANGE_END\t\t devid: %02x:%02x.%x\n",
844 for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
846 amd_iommu_alias_table[dev_i] = devid_to;
847 set_dev_entry_from_acpi(iommu,
848 devid_to, flags, ext_flags);
850 set_dev_entry_from_acpi(iommu, dev_i,
858 p += ivhd_entry_length(p);
862 /* Initializes the device->iommu mapping for the driver */
863 static int __init init_iommu_devices(struct amd_iommu *iommu)
867 for (i = iommu->first_device; i <= iommu->last_device; ++i)
868 set_iommu_for_device(iommu, i);
873 static void __init free_iommu_one(struct amd_iommu *iommu)
875 free_command_buffer(iommu);
876 free_event_buffer(iommu);
878 iommu_unmap_mmio_space(iommu);
881 static void __init free_iommu_all(void)
883 struct amd_iommu *iommu, *next;
885 for_each_iommu_safe(iommu, next) {
886 list_del(&iommu->list);
887 free_iommu_one(iommu);
893 * This function clues the initialization function for one IOMMU
894 * together and also allocates the command buffer and programs the
895 * hardware. It does NOT enable the IOMMU. This is done afterwards.
897 static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
899 spin_lock_init(&iommu->lock);
901 /* Add IOMMU to internal data structures */
902 list_add_tail(&iommu->list, &amd_iommu_list);
903 iommu->index = amd_iommus_present++;
905 if (unlikely(iommu->index >= MAX_IOMMUS)) {
906 WARN(1, "AMD-Vi: System has more IOMMUs than supported by this driver\n");
910 /* Index is fine - add IOMMU to the array */
911 amd_iommus[iommu->index] = iommu;
914 * Copy data from ACPI table entry to the iommu struct
916 iommu->devid = h->devid;
917 iommu->cap_ptr = h->cap_ptr;
918 iommu->pci_seg = h->pci_seg;
919 iommu->mmio_phys = h->mmio_phys;
920 iommu->mmio_base = iommu_map_mmio_space(h->mmio_phys);
921 if (!iommu->mmio_base)
924 iommu->cmd_buf = alloc_command_buffer(iommu);
928 iommu->evt_buf = alloc_event_buffer(iommu);
932 iommu->int_enabled = false;
934 init_iommu_from_acpi(iommu, h);
935 init_iommu_devices(iommu);
941 * Iterates over all IOMMU entries in the ACPI table, allocates the
942 * IOMMU structure and initializes it with init_iommu_one()
944 static int __init init_iommu_all(struct acpi_table_header *table)
946 u8 *p = (u8 *)table, *end = (u8 *)table;
947 struct ivhd_header *h;
948 struct amd_iommu *iommu;
951 end += table->length;
952 p += IVRS_HEADER_LENGTH;
955 h = (struct ivhd_header *)p;
959 DUMP_printk("device: %02x:%02x.%01x cap: %04x "
960 "seg: %d flags: %01x info %04x\n",
961 PCI_BUS(h->devid), PCI_SLOT(h->devid),
962 PCI_FUNC(h->devid), h->cap_ptr,
963 h->pci_seg, h->flags, h->info);
964 DUMP_printk(" mmio-addr: %016llx\n",
967 iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
971 ret = init_iommu_one(iommu, h);
986 static int iommu_init_pci(struct amd_iommu *iommu)
988 int cap_ptr = iommu->cap_ptr;
989 u32 range, misc, low, high;
991 iommu->dev = pci_get_bus_and_slot(PCI_BUS(iommu->devid),
992 iommu->devid & 0xff);
996 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
998 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_RANGE_OFFSET,
1000 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_MISC_OFFSET,
1003 iommu->first_device = calc_devid(MMIO_GET_BUS(range),
1004 MMIO_GET_FD(range));
1005 iommu->last_device = calc_devid(MMIO_GET_BUS(range),
1006 MMIO_GET_LD(range));
1008 if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
1009 amd_iommu_iotlb_sup = false;
1011 /* read extended feature bits */
1012 low = readl(iommu->mmio_base + MMIO_EXT_FEATURES);
1013 high = readl(iommu->mmio_base + MMIO_EXT_FEATURES + 4);
1015 iommu->features = ((u64)high << 32) | low;
1017 if (iommu_feature(iommu, FEATURE_GT)) {
1022 shift = iommu->features & FEATURE_PASID_MASK;
1023 shift >>= FEATURE_PASID_SHIFT;
1024 pasids = (1 << shift);
1026 amd_iommu_max_pasids = min(amd_iommu_max_pasids, pasids);
1028 glxval = iommu->features & FEATURE_GLXVAL_MASK;
1029 glxval >>= FEATURE_GLXVAL_SHIFT;
1031 if (amd_iommu_max_glx_val == -1)
1032 amd_iommu_max_glx_val = glxval;
1034 amd_iommu_max_glx_val = min(amd_iommu_max_glx_val, glxval);
1037 if (iommu_feature(iommu, FEATURE_GT) &&
1038 iommu_feature(iommu, FEATURE_PPR)) {
1039 iommu->is_iommu_v2 = true;
1040 amd_iommu_v2_present = true;
1043 if (iommu_feature(iommu, FEATURE_PPR)) {
1044 iommu->ppr_log = alloc_ppr_log(iommu);
1045 if (!iommu->ppr_log)
1049 if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE))
1050 amd_iommu_np_cache = true;
1052 if (is_rd890_iommu(iommu->dev)) {
1055 iommu->root_pdev = pci_get_bus_and_slot(iommu->dev->bus->number,
1059 * Some rd890 systems may not be fully reconfigured by the
1060 * BIOS, so it's necessary for us to store this information so
1061 * it can be reprogrammed on resume
1063 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 4,
1064 &iommu->stored_addr_lo);
1065 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 8,
1066 &iommu->stored_addr_hi);
1068 /* Low bit locks writes to configuration space */
1069 iommu->stored_addr_lo &= ~1;
1071 for (i = 0; i < 6; i++)
1072 for (j = 0; j < 0x12; j++)
1073 iommu->stored_l1[i][j] = iommu_read_l1(iommu, i, j);
1075 for (i = 0; i < 0x83; i++)
1076 iommu->stored_l2[i] = iommu_read_l2(iommu, i);
1079 return pci_enable_device(iommu->dev);
1082 static void print_iommu_info(void)
1084 static const char * const feat_str[] = {
1085 "PreF", "PPR", "X2APIC", "NX", "GT", "[5]",
1086 "IA", "GA", "HE", "PC"
1088 struct amd_iommu *iommu;
1090 for_each_iommu(iommu) {
1093 pr_info("AMD-Vi: Found IOMMU at %s cap 0x%hx\n",
1094 dev_name(&iommu->dev->dev), iommu->cap_ptr);
1096 if (iommu->cap & (1 << IOMMU_CAP_EFR)) {
1097 pr_info("AMD-Vi: Extended features: ");
1098 for (i = 0; ARRAY_SIZE(feat_str); ++i) {
1099 if (iommu_feature(iommu, (1ULL << i)))
1100 pr_cont(" %s", feat_str[i]);
1107 static int amd_iommu_init_pci(void)
1109 struct amd_iommu *iommu;
1112 for_each_iommu(iommu) {
1113 ret = iommu_init_pci(iommu);
1118 /* Make sure ACS will be enabled */
1121 ret = amd_iommu_init_devices();
1128 /****************************************************************************
1130 * The following functions initialize the MSI interrupts for all IOMMUs
1131 * in the system. Its a bit challenging because there could be multiple
1132 * IOMMUs per PCI BDF but we can call pci_enable_msi(x) only once per
1135 ****************************************************************************/
1137 static int iommu_setup_msi(struct amd_iommu *iommu)
1141 r = pci_enable_msi(iommu->dev);
1145 r = request_threaded_irq(iommu->dev->irq,
1146 amd_iommu_int_handler,
1147 amd_iommu_int_thread,
1152 pci_disable_msi(iommu->dev);
1156 iommu->int_enabled = true;
1161 static int iommu_init_msi(struct amd_iommu *iommu)
1165 if (iommu->int_enabled)
1168 if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI))
1169 ret = iommu_setup_msi(iommu);
1177 iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
1179 if (iommu->ppr_log != NULL)
1180 iommu_feature_enable(iommu, CONTROL_PPFINT_EN);
1185 /****************************************************************************
1187 * The next functions belong to the third pass of parsing the ACPI
1188 * table. In this last pass the memory mapping requirements are
1189 * gathered (like exclusion and unity mapping reanges).
1191 ****************************************************************************/
1193 static void __init free_unity_maps(void)
1195 struct unity_map_entry *entry, *next;
1197 list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {
1198 list_del(&entry->list);
1203 /* called when we find an exclusion range definition in ACPI */
1204 static int __init init_exclusion_range(struct ivmd_header *m)
1209 case ACPI_IVMD_TYPE:
1210 set_device_exclusion_range(m->devid, m);
1212 case ACPI_IVMD_TYPE_ALL:
1213 for (i = 0; i <= amd_iommu_last_bdf; ++i)
1214 set_device_exclusion_range(i, m);
1216 case ACPI_IVMD_TYPE_RANGE:
1217 for (i = m->devid; i <= m->aux; ++i)
1218 set_device_exclusion_range(i, m);
1227 /* called for unity map ACPI definition */
1228 static int __init init_unity_map_range(struct ivmd_header *m)
1230 struct unity_map_entry *e = NULL;
1233 e = kzalloc(sizeof(*e), GFP_KERNEL);
1241 case ACPI_IVMD_TYPE:
1242 s = "IVMD_TYPEi\t\t\t";
1243 e->devid_start = e->devid_end = m->devid;
1245 case ACPI_IVMD_TYPE_ALL:
1246 s = "IVMD_TYPE_ALL\t\t";
1248 e->devid_end = amd_iommu_last_bdf;
1250 case ACPI_IVMD_TYPE_RANGE:
1251 s = "IVMD_TYPE_RANGE\t\t";
1252 e->devid_start = m->devid;
1253 e->devid_end = m->aux;
1256 e->address_start = PAGE_ALIGN(m->range_start);
1257 e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
1258 e->prot = m->flags >> 1;
1260 DUMP_printk("%s devid_start: %02x:%02x.%x devid_end: %02x:%02x.%x"
1261 " range_start: %016llx range_end: %016llx flags: %x\n", s,
1262 PCI_BUS(e->devid_start), PCI_SLOT(e->devid_start),
1263 PCI_FUNC(e->devid_start), PCI_BUS(e->devid_end),
1264 PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end),
1265 e->address_start, e->address_end, m->flags);
1267 list_add_tail(&e->list, &amd_iommu_unity_map);
1272 /* iterates over all memory definitions we find in the ACPI table */
1273 static int __init init_memory_definitions(struct acpi_table_header *table)
1275 u8 *p = (u8 *)table, *end = (u8 *)table;
1276 struct ivmd_header *m;
1278 end += table->length;
1279 p += IVRS_HEADER_LENGTH;
1282 m = (struct ivmd_header *)p;
1283 if (m->flags & IVMD_FLAG_EXCL_RANGE)
1284 init_exclusion_range(m);
1285 else if (m->flags & IVMD_FLAG_UNITY_MAP)
1286 init_unity_map_range(m);
1295 * Init the device table to not allow DMA access for devices and
1296 * suppress all page faults
1298 static void init_device_table(void)
1302 for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
1303 set_dev_entry_bit(devid, DEV_ENTRY_VALID);
1304 set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
1308 static void iommu_init_flags(struct amd_iommu *iommu)
1310 iommu->acpi_flags & IVHD_FLAG_HT_TUN_EN_MASK ?
1311 iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
1312 iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
1314 iommu->acpi_flags & IVHD_FLAG_PASSPW_EN_MASK ?
1315 iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
1316 iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
1318 iommu->acpi_flags & IVHD_FLAG_RESPASSPW_EN_MASK ?
1319 iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
1320 iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
1322 iommu->acpi_flags & IVHD_FLAG_ISOC_EN_MASK ?
1323 iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
1324 iommu_feature_disable(iommu, CONTROL_ISOC_EN);
1327 * make IOMMU memory accesses cache coherent
1329 iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
1331 /* Set IOTLB invalidation timeout to 1s */
1332 iommu_set_inv_tlb_timeout(iommu, CTRL_INV_TO_1S);
1335 static void iommu_apply_resume_quirks(struct amd_iommu *iommu)
1338 u32 ioc_feature_control;
1339 struct pci_dev *pdev = iommu->root_pdev;
1341 /* RD890 BIOSes may not have completely reconfigured the iommu */
1342 if (!is_rd890_iommu(iommu->dev) || !pdev)
1346 * First, we need to ensure that the iommu is enabled. This is
1347 * controlled by a register in the northbridge
1350 /* Select Northbridge indirect register 0x75 and enable writing */
1351 pci_write_config_dword(pdev, 0x60, 0x75 | (1 << 7));
1352 pci_read_config_dword(pdev, 0x64, &ioc_feature_control);
1354 /* Enable the iommu */
1355 if (!(ioc_feature_control & 0x1))
1356 pci_write_config_dword(pdev, 0x64, ioc_feature_control | 1);
1358 /* Restore the iommu BAR */
1359 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
1360 iommu->stored_addr_lo);
1361 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 8,
1362 iommu->stored_addr_hi);
1364 /* Restore the l1 indirect regs for each of the 6 l1s */
1365 for (i = 0; i < 6; i++)
1366 for (j = 0; j < 0x12; j++)
1367 iommu_write_l1(iommu, i, j, iommu->stored_l1[i][j]);
1369 /* Restore the l2 indirect regs */
1370 for (i = 0; i < 0x83; i++)
1371 iommu_write_l2(iommu, i, iommu->stored_l2[i]);
1373 /* Lock PCI setup registers */
1374 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
1375 iommu->stored_addr_lo | 1);
1379 * This function finally enables all IOMMUs found in the system after
1380 * they have been initialized
1382 static void enable_iommus(void)
1384 struct amd_iommu *iommu;
1386 for_each_iommu(iommu) {
1387 iommu_disable(iommu);
1388 iommu_init_flags(iommu);
1389 iommu_set_device_table(iommu);
1390 iommu_enable_command_buffer(iommu);
1391 iommu_enable_event_buffer(iommu);
1392 iommu_enable_ppr_log(iommu);
1393 iommu_enable_gt(iommu);
1394 iommu_set_exclusion_range(iommu);
1395 iommu_enable(iommu);
1396 iommu_flush_all_caches(iommu);
1400 static void disable_iommus(void)
1402 struct amd_iommu *iommu;
1404 for_each_iommu(iommu)
1405 iommu_disable(iommu);
1409 * Suspend/Resume support
1410 * disable suspend until real resume implemented
1413 static void amd_iommu_resume(void)
1415 struct amd_iommu *iommu;
1417 for_each_iommu(iommu)
1418 iommu_apply_resume_quirks(iommu);
1420 /* re-load the hardware */
1423 amd_iommu_enable_interrupts();
1426 static int amd_iommu_suspend(void)
1428 /* disable IOMMUs to go out of the way for BIOS */
1434 static struct syscore_ops amd_iommu_syscore_ops = {
1435 .suspend = amd_iommu_suspend,
1436 .resume = amd_iommu_resume,
1439 static void __init free_on_init_error(void)
1441 amd_iommu_uninit_devices();
1443 free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
1444 get_order(MAX_DOMAIN_ID/8));
1446 free_pages((unsigned long)amd_iommu_rlookup_table,
1447 get_order(rlookup_table_size));
1449 free_pages((unsigned long)amd_iommu_alias_table,
1450 get_order(alias_table_size));
1452 free_pages((unsigned long)amd_iommu_dev_table,
1453 get_order(dev_table_size));
1459 #ifdef CONFIG_GART_IOMMU
1461 * We failed to initialize the AMD IOMMU - try fallback to GART
1470 * This is the hardware init function for AMD IOMMU in the system.
1471 * This function is called either from amd_iommu_init or from the interrupt
1472 * remapping setup code.
1474 * This function basically parses the ACPI table for AMD IOMMU (IVRS)
1477 * 1 pass) Find the highest PCI device id the driver has to handle.
1478 * Upon this information the size of the data structures is
1479 * determined that needs to be allocated.
1481 * 2 pass) Initialize the data structures just allocated with the
1482 * information in the ACPI table about available AMD IOMMUs
1483 * in the system. It also maps the PCI devices in the
1484 * system to specific IOMMUs
1486 * 3 pass) After the basic data structures are allocated and
1487 * initialized we update them with information about memory
1488 * remapping requirements parsed out of the ACPI table in
1491 * After everything is set up the IOMMUs are enabled and the necessary
1492 * hotplug and suspend notifiers are registered.
1494 static int __init early_amd_iommu_init(void)
1496 struct acpi_table_header *ivrs_base;
1497 acpi_size ivrs_size;
1501 if (!amd_iommu_detected)
1504 if (amd_iommu_dev_table != NULL) {
1505 /* Hardware already initialized */
1509 status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size);
1510 if (status == AE_NOT_FOUND)
1512 else if (ACPI_FAILURE(status)) {
1513 const char *err = acpi_format_exception(status);
1514 pr_err("AMD-Vi: IVRS table error: %s\n", err);
1519 * First parse ACPI tables to find the largest Bus/Dev/Func
1520 * we need to handle. Upon this information the shared data
1521 * structures for the IOMMUs in the system will be allocated
1523 if (find_last_devid_acpi(ivrs_base))
1526 dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE);
1527 alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
1528 rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);
1530 /* Device table - directly used by all IOMMUs */
1532 amd_iommu_dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
1533 get_order(dev_table_size));
1534 if (amd_iommu_dev_table == NULL)
1538 * Alias table - map PCI Bus/Dev/Func to Bus/Dev/Func the
1539 * IOMMU see for that device
1541 amd_iommu_alias_table = (void *)__get_free_pages(GFP_KERNEL,
1542 get_order(alias_table_size));
1543 if (amd_iommu_alias_table == NULL)
1546 /* IOMMU rlookup table - find the IOMMU for a specific device */
1547 amd_iommu_rlookup_table = (void *)__get_free_pages(
1548 GFP_KERNEL | __GFP_ZERO,
1549 get_order(rlookup_table_size));
1550 if (amd_iommu_rlookup_table == NULL)
1553 amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(
1554 GFP_KERNEL | __GFP_ZERO,
1555 get_order(MAX_DOMAIN_ID/8));
1556 if (amd_iommu_pd_alloc_bitmap == NULL)
1559 /* init the device table */
1560 init_device_table();
1563 * let all alias entries point to itself
1565 for (i = 0; i <= amd_iommu_last_bdf; ++i)
1566 amd_iommu_alias_table[i] = i;
1569 * never allocate domain 0 because its used as the non-allocated and
1570 * error value placeholder
1572 amd_iommu_pd_alloc_bitmap[0] = 1;
1574 spin_lock_init(&amd_iommu_pd_lock);
1577 * now the data structures are allocated and basically initialized
1578 * start the real acpi table scan
1580 ret = init_iommu_all(ivrs_base);
1584 ret = init_memory_definitions(ivrs_base);
1589 /* Don't leak any ACPI memory */
1590 early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
1596 free_on_init_error();
1601 int __init amd_iommu_init_hardware(void)
1605 ret = early_amd_iommu_init();
1609 ret = amd_iommu_init_pci();
1615 amd_iommu_init_notifier();
1617 register_syscore_ops(&amd_iommu_syscore_ops);
1622 static int amd_iommu_enable_interrupts(void)
1624 struct amd_iommu *iommu;
1627 for_each_iommu(iommu) {
1628 ret = iommu_init_msi(iommu);
1637 static bool detect_ivrs(void)
1639 struct acpi_table_header *ivrs_base;
1640 acpi_size ivrs_size;
1643 status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size);
1644 if (status == AE_NOT_FOUND)
1646 else if (ACPI_FAILURE(status)) {
1647 const char *err = acpi_format_exception(status);
1648 pr_err("AMD-Vi: IVRS table error: %s\n", err);
1652 early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
1658 * This is the core init function for AMD IOMMU hardware in the system.
1659 * This function is called from the generic x86 DMA layer initialization
1662 * The function calls amd_iommu_init_hardware() to setup and enable the
1663 * IOMMU hardware if this has not happened yet. After that the driver
1664 * registers for the DMA-API and for the IOMMU-API as necessary.
1666 static int __init amd_iommu_init(void)
1670 ret = amd_iommu_init_hardware();
1674 ret = amd_iommu_enable_interrupts();
1678 if (iommu_pass_through)
1679 ret = amd_iommu_init_passthrough();
1681 ret = amd_iommu_init_dma_ops();
1686 amd_iommu_init_api();
1688 x86_platform.iommu_shutdown = disable_iommus;
1690 if (iommu_pass_through)
1693 if (amd_iommu_unmap_flush)
1694 printk(KERN_INFO "AMD-Vi: IO/TLB flush on unmap enabled\n");
1696 printk(KERN_INFO "AMD-Vi: Lazy IO/TLB flushing enabled\n");
1704 free_on_init_error();
1709 /****************************************************************************
1711 * Early detect code. This code runs at IOMMU detection time in the DMA
1712 * layer. It just looks if there is an IVRS ACPI table to detect AMD
1715 ****************************************************************************/
1716 int __init amd_iommu_detect(void)
1719 if (no_iommu || (iommu_detected && !gart_iommu_aperture))
1722 if (amd_iommu_disabled)
1728 amd_iommu_detected = true;
1730 x86_init.iommu.iommu_init = amd_iommu_init;
1735 /****************************************************************************
1737 * Parsing functions for the AMD IOMMU specific kernel command line
1740 ****************************************************************************/
1742 static int __init parse_amd_iommu_dump(char *str)
1744 amd_iommu_dump = true;
1749 static int __init parse_amd_iommu_options(char *str)
1751 for (; *str; ++str) {
1752 if (strncmp(str, "fullflush", 9) == 0)
1753 amd_iommu_unmap_flush = true;
1754 if (strncmp(str, "off", 3) == 0)
1755 amd_iommu_disabled = true;
1756 if (strncmp(str, "force_isolation", 15) == 0)
1757 amd_iommu_force_isolation = true;
1763 __setup("amd_iommu_dump", parse_amd_iommu_dump);
1764 __setup("amd_iommu=", parse_amd_iommu_options);
1766 IOMMU_INIT_FINISH(amd_iommu_detect,
1767 gart_iommu_hole_init,
1771 bool amd_iommu_v2_supported(void)
1773 return amd_iommu_v2_present;
1775 EXPORT_SYMBOL(amd_iommu_v2_supported);