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 enum iommu_init_state {
203 static enum iommu_init_state init_state = IOMMU_START_STATE;
205 static int amd_iommu_enable_interrupts(void);
206 static int __init iommu_go_to_state(enum iommu_init_state state);
208 static inline void update_last_devid(u16 devid)
210 if (devid > amd_iommu_last_bdf)
211 amd_iommu_last_bdf = devid;
214 static inline unsigned long tbl_size(int entry_size)
216 unsigned shift = PAGE_SHIFT +
217 get_order(((int)amd_iommu_last_bdf + 1) * entry_size);
222 /* Access to l1 and l2 indexed register spaces */
224 static u32 iommu_read_l1(struct amd_iommu *iommu, u16 l1, u8 address)
228 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
229 pci_read_config_dword(iommu->dev, 0xfc, &val);
233 static void iommu_write_l1(struct amd_iommu *iommu, u16 l1, u8 address, u32 val)
235 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16 | 1 << 31));
236 pci_write_config_dword(iommu->dev, 0xfc, val);
237 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
240 static u32 iommu_read_l2(struct amd_iommu *iommu, u8 address)
244 pci_write_config_dword(iommu->dev, 0xf0, address);
245 pci_read_config_dword(iommu->dev, 0xf4, &val);
249 static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val)
251 pci_write_config_dword(iommu->dev, 0xf0, (address | 1 << 8));
252 pci_write_config_dword(iommu->dev, 0xf4, val);
255 /****************************************************************************
257 * AMD IOMMU MMIO register space handling functions
259 * These functions are used to program the IOMMU device registers in
260 * MMIO space required for that driver.
262 ****************************************************************************/
265 * This function set the exclusion range in the IOMMU. DMA accesses to the
266 * exclusion range are passed through untranslated
268 static void iommu_set_exclusion_range(struct amd_iommu *iommu)
270 u64 start = iommu->exclusion_start & PAGE_MASK;
271 u64 limit = (start + iommu->exclusion_length) & PAGE_MASK;
274 if (!iommu->exclusion_start)
277 entry = start | MMIO_EXCL_ENABLE_MASK;
278 memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
279 &entry, sizeof(entry));
282 memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
283 &entry, sizeof(entry));
286 /* Programs the physical address of the device table into the IOMMU hardware */
287 static void iommu_set_device_table(struct amd_iommu *iommu)
291 BUG_ON(iommu->mmio_base == NULL);
293 entry = virt_to_phys(amd_iommu_dev_table);
294 entry |= (dev_table_size >> 12) - 1;
295 memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET,
296 &entry, sizeof(entry));
299 /* Generic functions to enable/disable certain features of the IOMMU. */
300 static void iommu_feature_enable(struct amd_iommu *iommu, u8 bit)
304 ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
306 writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
309 static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
313 ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
315 writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
318 static void iommu_set_inv_tlb_timeout(struct amd_iommu *iommu, int timeout)
322 ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
323 ctrl &= ~CTRL_INV_TO_MASK;
324 ctrl |= (timeout << CONTROL_INV_TIMEOUT) & CTRL_INV_TO_MASK;
325 writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
328 /* Function to enable the hardware */
329 static void iommu_enable(struct amd_iommu *iommu)
331 iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
334 static void iommu_disable(struct amd_iommu *iommu)
336 /* Disable command buffer */
337 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
339 /* Disable event logging and event interrupts */
340 iommu_feature_disable(iommu, CONTROL_EVT_INT_EN);
341 iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
343 /* Disable IOMMU hardware itself */
344 iommu_feature_disable(iommu, CONTROL_IOMMU_EN);
348 * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in
349 * the system has one.
351 static u8 __iomem * __init iommu_map_mmio_space(u64 address)
353 if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu")) {
354 pr_err("AMD-Vi: Can not reserve memory region %llx for mmio\n",
356 pr_err("AMD-Vi: This is a BIOS bug. Please contact your hardware vendor\n");
360 return (u8 __iomem *)ioremap_nocache(address, MMIO_REGION_LENGTH);
363 static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu)
365 if (iommu->mmio_base)
366 iounmap(iommu->mmio_base);
367 release_mem_region(iommu->mmio_phys, MMIO_REGION_LENGTH);
370 /****************************************************************************
372 * The functions below belong to the first pass of AMD IOMMU ACPI table
373 * parsing. In this pass we try to find out the highest device id this
374 * code has to handle. Upon this information the size of the shared data
375 * structures is determined later.
377 ****************************************************************************/
380 * This function calculates the length of a given IVHD entry
382 static inline int ivhd_entry_length(u8 *ivhd)
384 return 0x04 << (*ivhd >> 6);
388 * This function reads the last device id the IOMMU has to handle from the PCI
389 * capability header for this IOMMU
391 static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr)
395 cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);
396 update_last_devid(calc_devid(MMIO_GET_BUS(cap), MMIO_GET_LD(cap)));
402 * After reading the highest device id from the IOMMU PCI capability header
403 * this function looks if there is a higher device id defined in the ACPI table
405 static int __init find_last_devid_from_ivhd(struct ivhd_header *h)
407 u8 *p = (void *)h, *end = (void *)h;
408 struct ivhd_entry *dev;
413 find_last_devid_on_pci(PCI_BUS(h->devid),
419 dev = (struct ivhd_entry *)p;
421 case IVHD_DEV_SELECT:
422 case IVHD_DEV_RANGE_END:
424 case IVHD_DEV_EXT_SELECT:
425 /* all the above subfield types refer to device ids */
426 update_last_devid(dev->devid);
431 p += ivhd_entry_length(p);
440 * Iterate over all IVHD entries in the ACPI table and find the highest device
441 * id which we need to handle. This is the first of three functions which parse
442 * the ACPI table. So we check the checksum here.
444 static int __init find_last_devid_acpi(struct acpi_table_header *table)
447 u8 checksum = 0, *p = (u8 *)table, *end = (u8 *)table;
448 struct ivhd_header *h;
451 * Validate checksum here so we don't need to do it when
452 * we actually parse the table
454 for (i = 0; i < table->length; ++i)
457 /* ACPI table corrupt */
460 p += IVRS_HEADER_LENGTH;
462 end += table->length;
464 h = (struct ivhd_header *)p;
467 find_last_devid_from_ivhd(h);
479 /****************************************************************************
481 * The following functions belong the the code path which parses the ACPI table
482 * the second time. In this ACPI parsing iteration we allocate IOMMU specific
483 * data structures, initialize the device/alias/rlookup table and also
484 * basically initialize the hardware.
486 ****************************************************************************/
489 * Allocates the command buffer. This buffer is per AMD IOMMU. We can
490 * write commands to that buffer later and the IOMMU will execute them
493 static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
495 u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
496 get_order(CMD_BUFFER_SIZE));
501 iommu->cmd_buf_size = CMD_BUFFER_SIZE | CMD_BUFFER_UNINITIALIZED;
507 * This function resets the command buffer if the IOMMU stopped fetching
510 void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu)
512 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
514 writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
515 writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
517 iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
521 * This function writes the command buffer address to the hardware and
524 static void iommu_enable_command_buffer(struct amd_iommu *iommu)
528 BUG_ON(iommu->cmd_buf == NULL);
530 entry = (u64)virt_to_phys(iommu->cmd_buf);
531 entry |= MMIO_CMD_SIZE_512;
533 memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
534 &entry, sizeof(entry));
536 amd_iommu_reset_cmd_buffer(iommu);
537 iommu->cmd_buf_size &= ~(CMD_BUFFER_UNINITIALIZED);
540 static void __init free_command_buffer(struct amd_iommu *iommu)
542 free_pages((unsigned long)iommu->cmd_buf,
543 get_order(iommu->cmd_buf_size & ~(CMD_BUFFER_UNINITIALIZED)));
546 /* allocates the memory where the IOMMU will log its events to */
547 static u8 * __init alloc_event_buffer(struct amd_iommu *iommu)
549 iommu->evt_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
550 get_order(EVT_BUFFER_SIZE));
552 if (iommu->evt_buf == NULL)
555 iommu->evt_buf_size = EVT_BUFFER_SIZE;
557 return iommu->evt_buf;
560 static void iommu_enable_event_buffer(struct amd_iommu *iommu)
564 BUG_ON(iommu->evt_buf == NULL);
566 entry = (u64)virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK;
568 memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
569 &entry, sizeof(entry));
571 /* set head and tail to zero manually */
572 writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
573 writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
575 iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
578 static void __init free_event_buffer(struct amd_iommu *iommu)
580 free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE));
583 /* allocates the memory where the IOMMU will log its events to */
584 static u8 * __init alloc_ppr_log(struct amd_iommu *iommu)
586 iommu->ppr_log = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
587 get_order(PPR_LOG_SIZE));
589 if (iommu->ppr_log == NULL)
592 return iommu->ppr_log;
595 static void iommu_enable_ppr_log(struct amd_iommu *iommu)
599 if (iommu->ppr_log == NULL)
602 entry = (u64)virt_to_phys(iommu->ppr_log) | PPR_LOG_SIZE_512;
604 memcpy_toio(iommu->mmio_base + MMIO_PPR_LOG_OFFSET,
605 &entry, sizeof(entry));
607 /* set head and tail to zero manually */
608 writel(0x00, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
609 writel(0x00, iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
611 iommu_feature_enable(iommu, CONTROL_PPFLOG_EN);
612 iommu_feature_enable(iommu, CONTROL_PPR_EN);
615 static void __init free_ppr_log(struct amd_iommu *iommu)
617 if (iommu->ppr_log == NULL)
620 free_pages((unsigned long)iommu->ppr_log, get_order(PPR_LOG_SIZE));
623 static void iommu_enable_gt(struct amd_iommu *iommu)
625 if (!iommu_feature(iommu, FEATURE_GT))
628 iommu_feature_enable(iommu, CONTROL_GT_EN);
631 /* sets a specific bit in the device table entry. */
632 static void set_dev_entry_bit(u16 devid, u8 bit)
634 int i = (bit >> 6) & 0x03;
635 int _bit = bit & 0x3f;
637 amd_iommu_dev_table[devid].data[i] |= (1UL << _bit);
640 static int get_dev_entry_bit(u16 devid, u8 bit)
642 int i = (bit >> 6) & 0x03;
643 int _bit = bit & 0x3f;
645 return (amd_iommu_dev_table[devid].data[i] & (1UL << _bit)) >> _bit;
649 void amd_iommu_apply_erratum_63(u16 devid)
653 sysmgt = get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1) |
654 (get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2) << 1);
657 set_dev_entry_bit(devid, DEV_ENTRY_IW);
660 /* Writes the specific IOMMU for a device into the rlookup table */
661 static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid)
663 amd_iommu_rlookup_table[devid] = iommu;
667 * This function takes the device specific flags read from the ACPI
668 * table and sets up the device table entry with that information
670 static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
671 u16 devid, u32 flags, u32 ext_flags)
673 if (flags & ACPI_DEVFLAG_INITPASS)
674 set_dev_entry_bit(devid, DEV_ENTRY_INIT_PASS);
675 if (flags & ACPI_DEVFLAG_EXTINT)
676 set_dev_entry_bit(devid, DEV_ENTRY_EINT_PASS);
677 if (flags & ACPI_DEVFLAG_NMI)
678 set_dev_entry_bit(devid, DEV_ENTRY_NMI_PASS);
679 if (flags & ACPI_DEVFLAG_SYSMGT1)
680 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1);
681 if (flags & ACPI_DEVFLAG_SYSMGT2)
682 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2);
683 if (flags & ACPI_DEVFLAG_LINT0)
684 set_dev_entry_bit(devid, DEV_ENTRY_LINT0_PASS);
685 if (flags & ACPI_DEVFLAG_LINT1)
686 set_dev_entry_bit(devid, DEV_ENTRY_LINT1_PASS);
688 amd_iommu_apply_erratum_63(devid);
690 set_iommu_for_device(iommu, devid);
694 * Reads the device exclusion range from ACPI and initialize IOMMU with
697 static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
699 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
701 if (!(m->flags & IVMD_FLAG_EXCL_RANGE))
706 * We only can configure exclusion ranges per IOMMU, not
707 * per device. But we can enable the exclusion range per
708 * device. This is done here
710 set_dev_entry_bit(m->devid, DEV_ENTRY_EX);
711 iommu->exclusion_start = m->range_start;
712 iommu->exclusion_length = m->range_length;
717 * Takes a pointer to an AMD IOMMU entry in the ACPI table and
718 * initializes the hardware and our data structures with it.
720 static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
721 struct ivhd_header *h)
724 u8 *end = p, flags = 0;
725 u16 devid = 0, devid_start = 0, devid_to = 0;
726 u32 dev_i, ext_flags = 0;
728 struct ivhd_entry *e;
731 * First save the recommended feature enable bits from ACPI
733 iommu->acpi_flags = h->flags;
736 * Done. Now parse the device entries
738 p += sizeof(struct ivhd_header);
743 e = (struct ivhd_entry *)p;
747 DUMP_printk(" DEV_ALL\t\t\t first devid: %02x:%02x.%x"
748 " last device %02x:%02x.%x flags: %02x\n",
749 PCI_BUS(iommu->first_device),
750 PCI_SLOT(iommu->first_device),
751 PCI_FUNC(iommu->first_device),
752 PCI_BUS(iommu->last_device),
753 PCI_SLOT(iommu->last_device),
754 PCI_FUNC(iommu->last_device),
757 for (dev_i = iommu->first_device;
758 dev_i <= iommu->last_device; ++dev_i)
759 set_dev_entry_from_acpi(iommu, dev_i,
762 case IVHD_DEV_SELECT:
764 DUMP_printk(" DEV_SELECT\t\t\t devid: %02x:%02x.%x "
772 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
774 case IVHD_DEV_SELECT_RANGE_START:
776 DUMP_printk(" DEV_SELECT_RANGE_START\t "
777 "devid: %02x:%02x.%x flags: %02x\n",
783 devid_start = e->devid;
790 DUMP_printk(" DEV_ALIAS\t\t\t devid: %02x:%02x.%x "
791 "flags: %02x devid_to: %02x:%02x.%x\n",
796 PCI_BUS(e->ext >> 8),
797 PCI_SLOT(e->ext >> 8),
798 PCI_FUNC(e->ext >> 8));
801 devid_to = e->ext >> 8;
802 set_dev_entry_from_acpi(iommu, devid , e->flags, 0);
803 set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0);
804 amd_iommu_alias_table[devid] = devid_to;
806 case IVHD_DEV_ALIAS_RANGE:
808 DUMP_printk(" DEV_ALIAS_RANGE\t\t "
809 "devid: %02x:%02x.%x flags: %02x "
810 "devid_to: %02x:%02x.%x\n",
815 PCI_BUS(e->ext >> 8),
816 PCI_SLOT(e->ext >> 8),
817 PCI_FUNC(e->ext >> 8));
819 devid_start = e->devid;
821 devid_to = e->ext >> 8;
825 case IVHD_DEV_EXT_SELECT:
827 DUMP_printk(" DEV_EXT_SELECT\t\t devid: %02x:%02x.%x "
828 "flags: %02x ext: %08x\n",
835 set_dev_entry_from_acpi(iommu, devid, e->flags,
838 case IVHD_DEV_EXT_SELECT_RANGE:
840 DUMP_printk(" DEV_EXT_SELECT_RANGE\t devid: "
841 "%02x:%02x.%x flags: %02x ext: %08x\n",
847 devid_start = e->devid;
852 case IVHD_DEV_RANGE_END:
854 DUMP_printk(" DEV_RANGE_END\t\t devid: %02x:%02x.%x\n",
860 for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
862 amd_iommu_alias_table[dev_i] = devid_to;
863 set_dev_entry_from_acpi(iommu,
864 devid_to, flags, ext_flags);
866 set_dev_entry_from_acpi(iommu, dev_i,
874 p += ivhd_entry_length(p);
878 /* Initializes the device->iommu mapping for the driver */
879 static int __init init_iommu_devices(struct amd_iommu *iommu)
883 for (i = iommu->first_device; i <= iommu->last_device; ++i)
884 set_iommu_for_device(iommu, i);
889 static void __init free_iommu_one(struct amd_iommu *iommu)
891 free_command_buffer(iommu);
892 free_event_buffer(iommu);
894 iommu_unmap_mmio_space(iommu);
897 static void __init free_iommu_all(void)
899 struct amd_iommu *iommu, *next;
901 for_each_iommu_safe(iommu, next) {
902 list_del(&iommu->list);
903 free_iommu_one(iommu);
909 * This function clues the initialization function for one IOMMU
910 * together and also allocates the command buffer and programs the
911 * hardware. It does NOT enable the IOMMU. This is done afterwards.
913 static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
915 spin_lock_init(&iommu->lock);
917 /* Add IOMMU to internal data structures */
918 list_add_tail(&iommu->list, &amd_iommu_list);
919 iommu->index = amd_iommus_present++;
921 if (unlikely(iommu->index >= MAX_IOMMUS)) {
922 WARN(1, "AMD-Vi: System has more IOMMUs than supported by this driver\n");
926 /* Index is fine - add IOMMU to the array */
927 amd_iommus[iommu->index] = iommu;
930 * Copy data from ACPI table entry to the iommu struct
932 iommu->devid = h->devid;
933 iommu->cap_ptr = h->cap_ptr;
934 iommu->pci_seg = h->pci_seg;
935 iommu->mmio_phys = h->mmio_phys;
936 iommu->mmio_base = iommu_map_mmio_space(h->mmio_phys);
937 if (!iommu->mmio_base)
940 iommu->cmd_buf = alloc_command_buffer(iommu);
944 iommu->evt_buf = alloc_event_buffer(iommu);
948 iommu->int_enabled = false;
950 init_iommu_from_acpi(iommu, h);
951 init_iommu_devices(iommu);
957 * Iterates over all IOMMU entries in the ACPI table, allocates the
958 * IOMMU structure and initializes it with init_iommu_one()
960 static int __init init_iommu_all(struct acpi_table_header *table)
962 u8 *p = (u8 *)table, *end = (u8 *)table;
963 struct ivhd_header *h;
964 struct amd_iommu *iommu;
967 end += table->length;
968 p += IVRS_HEADER_LENGTH;
971 h = (struct ivhd_header *)p;
975 DUMP_printk("device: %02x:%02x.%01x cap: %04x "
976 "seg: %d flags: %01x info %04x\n",
977 PCI_BUS(h->devid), PCI_SLOT(h->devid),
978 PCI_FUNC(h->devid), h->cap_ptr,
979 h->pci_seg, h->flags, h->info);
980 DUMP_printk(" mmio-addr: %016llx\n",
983 iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
987 ret = init_iommu_one(iommu, h);
1002 static int iommu_init_pci(struct amd_iommu *iommu)
1004 int cap_ptr = iommu->cap_ptr;
1005 u32 range, misc, low, high;
1007 iommu->dev = pci_get_bus_and_slot(PCI_BUS(iommu->devid),
1008 iommu->devid & 0xff);
1012 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
1014 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_RANGE_OFFSET,
1016 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_MISC_OFFSET,
1019 iommu->first_device = calc_devid(MMIO_GET_BUS(range),
1020 MMIO_GET_FD(range));
1021 iommu->last_device = calc_devid(MMIO_GET_BUS(range),
1022 MMIO_GET_LD(range));
1024 if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
1025 amd_iommu_iotlb_sup = false;
1027 /* read extended feature bits */
1028 low = readl(iommu->mmio_base + MMIO_EXT_FEATURES);
1029 high = readl(iommu->mmio_base + MMIO_EXT_FEATURES + 4);
1031 iommu->features = ((u64)high << 32) | low;
1033 if (iommu_feature(iommu, FEATURE_GT)) {
1038 shift = iommu->features & FEATURE_PASID_MASK;
1039 shift >>= FEATURE_PASID_SHIFT;
1040 pasids = (1 << shift);
1042 amd_iommu_max_pasids = min(amd_iommu_max_pasids, pasids);
1044 glxval = iommu->features & FEATURE_GLXVAL_MASK;
1045 glxval >>= FEATURE_GLXVAL_SHIFT;
1047 if (amd_iommu_max_glx_val == -1)
1048 amd_iommu_max_glx_val = glxval;
1050 amd_iommu_max_glx_val = min(amd_iommu_max_glx_val, glxval);
1053 if (iommu_feature(iommu, FEATURE_GT) &&
1054 iommu_feature(iommu, FEATURE_PPR)) {
1055 iommu->is_iommu_v2 = true;
1056 amd_iommu_v2_present = true;
1059 if (iommu_feature(iommu, FEATURE_PPR)) {
1060 iommu->ppr_log = alloc_ppr_log(iommu);
1061 if (!iommu->ppr_log)
1065 if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE))
1066 amd_iommu_np_cache = true;
1068 if (is_rd890_iommu(iommu->dev)) {
1071 iommu->root_pdev = pci_get_bus_and_slot(iommu->dev->bus->number,
1075 * Some rd890 systems may not be fully reconfigured by the
1076 * BIOS, so it's necessary for us to store this information so
1077 * it can be reprogrammed on resume
1079 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 4,
1080 &iommu->stored_addr_lo);
1081 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 8,
1082 &iommu->stored_addr_hi);
1084 /* Low bit locks writes to configuration space */
1085 iommu->stored_addr_lo &= ~1;
1087 for (i = 0; i < 6; i++)
1088 for (j = 0; j < 0x12; j++)
1089 iommu->stored_l1[i][j] = iommu_read_l1(iommu, i, j);
1091 for (i = 0; i < 0x83; i++)
1092 iommu->stored_l2[i] = iommu_read_l2(iommu, i);
1095 return pci_enable_device(iommu->dev);
1098 static void print_iommu_info(void)
1100 static const char * const feat_str[] = {
1101 "PreF", "PPR", "X2APIC", "NX", "GT", "[5]",
1102 "IA", "GA", "HE", "PC"
1104 struct amd_iommu *iommu;
1106 for_each_iommu(iommu) {
1109 pr_info("AMD-Vi: Found IOMMU at %s cap 0x%hx\n",
1110 dev_name(&iommu->dev->dev), iommu->cap_ptr);
1112 if (iommu->cap & (1 << IOMMU_CAP_EFR)) {
1113 pr_info("AMD-Vi: Extended features: ");
1114 for (i = 0; ARRAY_SIZE(feat_str); ++i) {
1115 if (iommu_feature(iommu, (1ULL << i)))
1116 pr_cont(" %s", feat_str[i]);
1123 static int __init amd_iommu_init_pci(void)
1125 struct amd_iommu *iommu;
1128 for_each_iommu(iommu) {
1129 ret = iommu_init_pci(iommu);
1134 ret = amd_iommu_init_devices();
1141 /****************************************************************************
1143 * The following functions initialize the MSI interrupts for all IOMMUs
1144 * in the system. Its a bit challenging because there could be multiple
1145 * IOMMUs per PCI BDF but we can call pci_enable_msi(x) only once per
1148 ****************************************************************************/
1150 static int iommu_setup_msi(struct amd_iommu *iommu)
1154 r = pci_enable_msi(iommu->dev);
1158 r = request_threaded_irq(iommu->dev->irq,
1159 amd_iommu_int_handler,
1160 amd_iommu_int_thread,
1165 pci_disable_msi(iommu->dev);
1169 iommu->int_enabled = true;
1174 static int iommu_init_msi(struct amd_iommu *iommu)
1178 if (iommu->int_enabled)
1181 if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI))
1182 ret = iommu_setup_msi(iommu);
1190 iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
1192 if (iommu->ppr_log != NULL)
1193 iommu_feature_enable(iommu, CONTROL_PPFINT_EN);
1198 /****************************************************************************
1200 * The next functions belong to the third pass of parsing the ACPI
1201 * table. In this last pass the memory mapping requirements are
1202 * gathered (like exclusion and unity mapping reanges).
1204 ****************************************************************************/
1206 static void __init free_unity_maps(void)
1208 struct unity_map_entry *entry, *next;
1210 list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {
1211 list_del(&entry->list);
1216 /* called when we find an exclusion range definition in ACPI */
1217 static int __init init_exclusion_range(struct ivmd_header *m)
1222 case ACPI_IVMD_TYPE:
1223 set_device_exclusion_range(m->devid, m);
1225 case ACPI_IVMD_TYPE_ALL:
1226 for (i = 0; i <= amd_iommu_last_bdf; ++i)
1227 set_device_exclusion_range(i, m);
1229 case ACPI_IVMD_TYPE_RANGE:
1230 for (i = m->devid; i <= m->aux; ++i)
1231 set_device_exclusion_range(i, m);
1240 /* called for unity map ACPI definition */
1241 static int __init init_unity_map_range(struct ivmd_header *m)
1243 struct unity_map_entry *e = NULL;
1246 e = kzalloc(sizeof(*e), GFP_KERNEL);
1254 case ACPI_IVMD_TYPE:
1255 s = "IVMD_TYPEi\t\t\t";
1256 e->devid_start = e->devid_end = m->devid;
1258 case ACPI_IVMD_TYPE_ALL:
1259 s = "IVMD_TYPE_ALL\t\t";
1261 e->devid_end = amd_iommu_last_bdf;
1263 case ACPI_IVMD_TYPE_RANGE:
1264 s = "IVMD_TYPE_RANGE\t\t";
1265 e->devid_start = m->devid;
1266 e->devid_end = m->aux;
1269 e->address_start = PAGE_ALIGN(m->range_start);
1270 e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
1271 e->prot = m->flags >> 1;
1273 DUMP_printk("%s devid_start: %02x:%02x.%x devid_end: %02x:%02x.%x"
1274 " range_start: %016llx range_end: %016llx flags: %x\n", s,
1275 PCI_BUS(e->devid_start), PCI_SLOT(e->devid_start),
1276 PCI_FUNC(e->devid_start), PCI_BUS(e->devid_end),
1277 PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end),
1278 e->address_start, e->address_end, m->flags);
1280 list_add_tail(&e->list, &amd_iommu_unity_map);
1285 /* iterates over all memory definitions we find in the ACPI table */
1286 static int __init init_memory_definitions(struct acpi_table_header *table)
1288 u8 *p = (u8 *)table, *end = (u8 *)table;
1289 struct ivmd_header *m;
1291 end += table->length;
1292 p += IVRS_HEADER_LENGTH;
1295 m = (struct ivmd_header *)p;
1296 if (m->flags & IVMD_FLAG_EXCL_RANGE)
1297 init_exclusion_range(m);
1298 else if (m->flags & IVMD_FLAG_UNITY_MAP)
1299 init_unity_map_range(m);
1308 * Init the device table to not allow DMA access for devices and
1309 * suppress all page faults
1311 static void init_device_table(void)
1315 for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
1316 set_dev_entry_bit(devid, DEV_ENTRY_VALID);
1317 set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
1321 static void iommu_init_flags(struct amd_iommu *iommu)
1323 iommu->acpi_flags & IVHD_FLAG_HT_TUN_EN_MASK ?
1324 iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
1325 iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
1327 iommu->acpi_flags & IVHD_FLAG_PASSPW_EN_MASK ?
1328 iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
1329 iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
1331 iommu->acpi_flags & IVHD_FLAG_RESPASSPW_EN_MASK ?
1332 iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
1333 iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
1335 iommu->acpi_flags & IVHD_FLAG_ISOC_EN_MASK ?
1336 iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
1337 iommu_feature_disable(iommu, CONTROL_ISOC_EN);
1340 * make IOMMU memory accesses cache coherent
1342 iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
1344 /* Set IOTLB invalidation timeout to 1s */
1345 iommu_set_inv_tlb_timeout(iommu, CTRL_INV_TO_1S);
1348 static void iommu_apply_resume_quirks(struct amd_iommu *iommu)
1351 u32 ioc_feature_control;
1352 struct pci_dev *pdev = iommu->root_pdev;
1354 /* RD890 BIOSes may not have completely reconfigured the iommu */
1355 if (!is_rd890_iommu(iommu->dev) || !pdev)
1359 * First, we need to ensure that the iommu is enabled. This is
1360 * controlled by a register in the northbridge
1363 /* Select Northbridge indirect register 0x75 and enable writing */
1364 pci_write_config_dword(pdev, 0x60, 0x75 | (1 << 7));
1365 pci_read_config_dword(pdev, 0x64, &ioc_feature_control);
1367 /* Enable the iommu */
1368 if (!(ioc_feature_control & 0x1))
1369 pci_write_config_dword(pdev, 0x64, ioc_feature_control | 1);
1371 /* Restore the iommu BAR */
1372 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
1373 iommu->stored_addr_lo);
1374 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 8,
1375 iommu->stored_addr_hi);
1377 /* Restore the l1 indirect regs for each of the 6 l1s */
1378 for (i = 0; i < 6; i++)
1379 for (j = 0; j < 0x12; j++)
1380 iommu_write_l1(iommu, i, j, iommu->stored_l1[i][j]);
1382 /* Restore the l2 indirect regs */
1383 for (i = 0; i < 0x83; i++)
1384 iommu_write_l2(iommu, i, iommu->stored_l2[i]);
1386 /* Lock PCI setup registers */
1387 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
1388 iommu->stored_addr_lo | 1);
1392 * This function finally enables all IOMMUs found in the system after
1393 * they have been initialized
1395 static void early_enable_iommus(void)
1397 struct amd_iommu *iommu;
1399 for_each_iommu(iommu) {
1400 iommu_disable(iommu);
1401 iommu_init_flags(iommu);
1402 iommu_set_device_table(iommu);
1403 iommu_enable_command_buffer(iommu);
1404 iommu_enable_event_buffer(iommu);
1405 iommu_set_exclusion_range(iommu);
1406 iommu_enable(iommu);
1407 iommu_flush_all_caches(iommu);
1411 static void enable_iommus_v2(void)
1413 struct amd_iommu *iommu;
1415 for_each_iommu(iommu) {
1416 iommu_enable_ppr_log(iommu);
1417 iommu_enable_gt(iommu);
1421 static void enable_iommus(void)
1423 early_enable_iommus();
1428 static void disable_iommus(void)
1430 struct amd_iommu *iommu;
1432 for_each_iommu(iommu)
1433 iommu_disable(iommu);
1437 * Suspend/Resume support
1438 * disable suspend until real resume implemented
1441 static void amd_iommu_resume(void)
1443 struct amd_iommu *iommu;
1445 for_each_iommu(iommu)
1446 iommu_apply_resume_quirks(iommu);
1448 /* re-load the hardware */
1451 amd_iommu_enable_interrupts();
1454 static int amd_iommu_suspend(void)
1456 /* disable IOMMUs to go out of the way for BIOS */
1462 static struct syscore_ops amd_iommu_syscore_ops = {
1463 .suspend = amd_iommu_suspend,
1464 .resume = amd_iommu_resume,
1467 static void __init free_on_init_error(void)
1469 amd_iommu_uninit_devices();
1471 free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
1472 get_order(MAX_DOMAIN_ID/8));
1474 free_pages((unsigned long)amd_iommu_rlookup_table,
1475 get_order(rlookup_table_size));
1477 free_pages((unsigned long)amd_iommu_alias_table,
1478 get_order(alias_table_size));
1480 free_pages((unsigned long)amd_iommu_dev_table,
1481 get_order(dev_table_size));
1487 #ifdef CONFIG_GART_IOMMU
1489 * We failed to initialize the AMD IOMMU - try fallback to GART
1498 * This is the hardware init function for AMD IOMMU in the system.
1499 * This function is called either from amd_iommu_init or from the interrupt
1500 * remapping setup code.
1502 * This function basically parses the ACPI table for AMD IOMMU (IVRS)
1505 * 1 pass) Find the highest PCI device id the driver has to handle.
1506 * Upon this information the size of the data structures is
1507 * determined that needs to be allocated.
1509 * 2 pass) Initialize the data structures just allocated with the
1510 * information in the ACPI table about available AMD IOMMUs
1511 * in the system. It also maps the PCI devices in the
1512 * system to specific IOMMUs
1514 * 3 pass) After the basic data structures are allocated and
1515 * initialized we update them with information about memory
1516 * remapping requirements parsed out of the ACPI table in
1519 * After everything is set up the IOMMUs are enabled and the necessary
1520 * hotplug and suspend notifiers are registered.
1522 static int __init early_amd_iommu_init(void)
1524 struct acpi_table_header *ivrs_base;
1525 acpi_size ivrs_size;
1529 if (!amd_iommu_detected)
1532 status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size);
1533 if (status == AE_NOT_FOUND)
1535 else if (ACPI_FAILURE(status)) {
1536 const char *err = acpi_format_exception(status);
1537 pr_err("AMD-Vi: IVRS table error: %s\n", err);
1542 * First parse ACPI tables to find the largest Bus/Dev/Func
1543 * we need to handle. Upon this information the shared data
1544 * structures for the IOMMUs in the system will be allocated
1546 ret = find_last_devid_acpi(ivrs_base);
1550 dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE);
1551 alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
1552 rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);
1554 /* Device table - directly used by all IOMMUs */
1556 amd_iommu_dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
1557 get_order(dev_table_size));
1558 if (amd_iommu_dev_table == NULL)
1562 * Alias table - map PCI Bus/Dev/Func to Bus/Dev/Func the
1563 * IOMMU see for that device
1565 amd_iommu_alias_table = (void *)__get_free_pages(GFP_KERNEL,
1566 get_order(alias_table_size));
1567 if (amd_iommu_alias_table == NULL)
1570 /* IOMMU rlookup table - find the IOMMU for a specific device */
1571 amd_iommu_rlookup_table = (void *)__get_free_pages(
1572 GFP_KERNEL | __GFP_ZERO,
1573 get_order(rlookup_table_size));
1574 if (amd_iommu_rlookup_table == NULL)
1577 amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(
1578 GFP_KERNEL | __GFP_ZERO,
1579 get_order(MAX_DOMAIN_ID/8));
1580 if (amd_iommu_pd_alloc_bitmap == NULL)
1583 /* init the device table */
1584 init_device_table();
1587 * let all alias entries point to itself
1589 for (i = 0; i <= amd_iommu_last_bdf; ++i)
1590 amd_iommu_alias_table[i] = i;
1593 * never allocate domain 0 because its used as the non-allocated and
1594 * error value placeholder
1596 amd_iommu_pd_alloc_bitmap[0] = 1;
1598 spin_lock_init(&amd_iommu_pd_lock);
1601 * now the data structures are allocated and basically initialized
1602 * start the real acpi table scan
1604 ret = init_iommu_all(ivrs_base);
1608 ret = init_memory_definitions(ivrs_base);
1613 /* Don't leak any ACPI memory */
1614 early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
1620 static int amd_iommu_enable_interrupts(void)
1622 struct amd_iommu *iommu;
1625 for_each_iommu(iommu) {
1626 ret = iommu_init_msi(iommu);
1635 static bool detect_ivrs(void)
1637 struct acpi_table_header *ivrs_base;
1638 acpi_size ivrs_size;
1641 status = acpi_get_table_with_size("IVRS", 0, &ivrs_base, &ivrs_size);
1642 if (status == AE_NOT_FOUND)
1644 else if (ACPI_FAILURE(status)) {
1645 const char *err = acpi_format_exception(status);
1646 pr_err("AMD-Vi: IVRS table error: %s\n", err);
1650 early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
1652 /* Make sure ACS will be enabled during PCI probe */
1658 static int amd_iommu_init_dma(void)
1662 if (iommu_pass_through)
1663 ret = amd_iommu_init_passthrough();
1665 ret = amd_iommu_init_dma_ops();
1670 amd_iommu_init_api();
1672 amd_iommu_init_notifier();
1677 /****************************************************************************
1679 * AMD IOMMU Initialization State Machine
1681 ****************************************************************************/
1683 static int __init state_next(void)
1687 switch (init_state) {
1688 case IOMMU_START_STATE:
1689 if (!detect_ivrs()) {
1690 init_state = IOMMU_NOT_FOUND;
1693 init_state = IOMMU_IVRS_DETECTED;
1696 case IOMMU_IVRS_DETECTED:
1697 ret = early_amd_iommu_init();
1698 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_ACPI_FINISHED;
1700 case IOMMU_ACPI_FINISHED:
1701 early_enable_iommus();
1702 register_syscore_ops(&amd_iommu_syscore_ops);
1703 x86_platform.iommu_shutdown = disable_iommus;
1704 init_state = IOMMU_ENABLED;
1707 ret = amd_iommu_init_pci();
1708 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_PCI_INIT;
1711 case IOMMU_PCI_INIT:
1712 ret = amd_iommu_enable_interrupts();
1713 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_INTERRUPTS_EN;
1715 case IOMMU_INTERRUPTS_EN:
1716 ret = amd_iommu_init_dma();
1717 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_DMA_OPS;
1720 init_state = IOMMU_INITIALIZED;
1722 case IOMMU_INITIALIZED:
1725 case IOMMU_NOT_FOUND:
1726 case IOMMU_INIT_ERROR:
1727 /* Error states => do nothing */
1738 static int __init iommu_go_to_state(enum iommu_init_state state)
1742 while (init_state != state) {
1744 if (init_state == IOMMU_NOT_FOUND ||
1745 init_state == IOMMU_INIT_ERROR)
1755 * This is the core init function for AMD IOMMU hardware in the system.
1756 * This function is called from the generic x86 DMA layer initialization
1759 static int __init amd_iommu_init(void)
1763 ret = iommu_go_to_state(IOMMU_INITIALIZED);
1766 free_on_init_error();
1772 /****************************************************************************
1774 * Early detect code. This code runs at IOMMU detection time in the DMA
1775 * layer. It just looks if there is an IVRS ACPI table to detect AMD
1778 ****************************************************************************/
1779 int __init amd_iommu_detect(void)
1783 if (no_iommu || (iommu_detected && !gart_iommu_aperture))
1786 if (amd_iommu_disabled)
1789 ret = iommu_go_to_state(IOMMU_IVRS_DETECTED);
1793 amd_iommu_detected = true;
1795 x86_init.iommu.iommu_init = amd_iommu_init;
1800 /****************************************************************************
1802 * Parsing functions for the AMD IOMMU specific kernel command line
1805 ****************************************************************************/
1807 static int __init parse_amd_iommu_dump(char *str)
1809 amd_iommu_dump = true;
1814 static int __init parse_amd_iommu_options(char *str)
1816 for (; *str; ++str) {
1817 if (strncmp(str, "fullflush", 9) == 0)
1818 amd_iommu_unmap_flush = true;
1819 if (strncmp(str, "off", 3) == 0)
1820 amd_iommu_disabled = true;
1821 if (strncmp(str, "force_isolation", 15) == 0)
1822 amd_iommu_force_isolation = true;
1828 __setup("amd_iommu_dump", parse_amd_iommu_dump);
1829 __setup("amd_iommu=", parse_amd_iommu_options);
1831 IOMMU_INIT_FINISH(amd_iommu_detect,
1832 gart_iommu_hole_init,
1836 bool amd_iommu_v2_supported(void)
1838 return amd_iommu_v2_present;
1840 EXPORT_SYMBOL(amd_iommu_v2_supported);