1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
4 * Author: Joerg Roedel <jroedel@suse.de>
5 * Leo Duran <leo.duran@amd.com>
8 #define pr_fmt(fmt) "AMD-Vi: " fmt
9 #define dev_fmt(fmt) pr_fmt(fmt)
11 #include <linux/pci.h>
12 #include <linux/acpi.h>
13 #include <linux/list.h>
14 #include <linux/bitmap.h>
15 #include <linux/slab.h>
16 #include <linux/syscore_ops.h>
17 #include <linux/interrupt.h>
18 #include <linux/msi.h>
19 #include <linux/irq.h>
20 #include <linux/amd-iommu.h>
21 #include <linux/export.h>
22 #include <linux/kmemleak.h>
23 #include <linux/cc_platform.h>
24 #include <linux/iopoll.h>
25 #include <asm/pci-direct.h>
26 #include <asm/iommu.h>
29 #include <asm/x86_init.h>
30 #include <asm/io_apic.h>
31 #include <asm/irq_remapping.h>
32 #include <asm/set_memory.h>
34 #include <linux/crash_dump.h>
36 #include "amd_iommu.h"
37 #include "../irq_remapping.h"
40 * definitions for the ACPI scanning code
42 #define IVRS_HEADER_LENGTH 48
44 #define ACPI_IVHD_TYPE_MAX_SUPPORTED 0x40
45 #define ACPI_IVMD_TYPE_ALL 0x20
46 #define ACPI_IVMD_TYPE 0x21
47 #define ACPI_IVMD_TYPE_RANGE 0x22
49 #define IVHD_DEV_ALL 0x01
50 #define IVHD_DEV_SELECT 0x02
51 #define IVHD_DEV_SELECT_RANGE_START 0x03
52 #define IVHD_DEV_RANGE_END 0x04
53 #define IVHD_DEV_ALIAS 0x42
54 #define IVHD_DEV_ALIAS_RANGE 0x43
55 #define IVHD_DEV_EXT_SELECT 0x46
56 #define IVHD_DEV_EXT_SELECT_RANGE 0x47
57 #define IVHD_DEV_SPECIAL 0x48
58 #define IVHD_DEV_ACPI_HID 0xf0
60 #define UID_NOT_PRESENT 0
61 #define UID_IS_INTEGER 1
62 #define UID_IS_CHARACTER 2
64 #define IVHD_SPECIAL_IOAPIC 1
65 #define IVHD_SPECIAL_HPET 2
67 #define IVHD_FLAG_HT_TUN_EN_MASK 0x01
68 #define IVHD_FLAG_PASSPW_EN_MASK 0x02
69 #define IVHD_FLAG_RESPASSPW_EN_MASK 0x04
70 #define IVHD_FLAG_ISOC_EN_MASK 0x08
72 #define IVMD_FLAG_EXCL_RANGE 0x08
73 #define IVMD_FLAG_IW 0x04
74 #define IVMD_FLAG_IR 0x02
75 #define IVMD_FLAG_UNITY_MAP 0x01
77 #define ACPI_DEVFLAG_INITPASS 0x01
78 #define ACPI_DEVFLAG_EXTINT 0x02
79 #define ACPI_DEVFLAG_NMI 0x04
80 #define ACPI_DEVFLAG_SYSMGT1 0x10
81 #define ACPI_DEVFLAG_SYSMGT2 0x20
82 #define ACPI_DEVFLAG_LINT0 0x40
83 #define ACPI_DEVFLAG_LINT1 0x80
84 #define ACPI_DEVFLAG_ATSDIS 0x10000000
86 #define LOOP_TIMEOUT 2000000
88 #define IVRS_GET_SBDF_ID(seg, bus, dev, fd) (((seg & 0xffff) << 16) | ((bus & 0xff) << 8) \
89 | ((dev & 0x1f) << 3) | (fn & 0x7))
92 * ACPI table definitions
94 * These data structures are laid over the table to parse the important values
99 * structure describing one IOMMU in the ACPI table. Typically followed by one
100 * or more ivhd_entrys.
113 /* Following only valid on IVHD type 11h and 40h */
114 u64 efr_reg; /* Exact copy of MMIO_EXT_FEATURES */
116 } __attribute__((packed));
119 * A device entry describing which devices a specific IOMMU translates and
120 * which requestor ids they use.
126 struct_group(ext_hid,
134 } __attribute__((packed));
137 * An AMD IOMMU memory definition structure. It defines things like exclusion
138 * ranges for devices and regions that should be unity mapped.
150 } __attribute__((packed));
153 bool amd_iommu_irq_remap __read_mostly;
155 enum io_pgtable_fmt amd_iommu_pgtable = AMD_IOMMU_V1;
157 int amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_VAPIC;
158 static int amd_iommu_xt_mode = IRQ_REMAP_XAPIC_MODE;
160 static bool amd_iommu_detected;
161 static bool amd_iommu_disabled __initdata;
162 static bool amd_iommu_force_enable __initdata;
163 static int amd_iommu_target_ivhd_type;
165 /* Global EFR and EFR2 registers */
169 /* SNP is enabled on the system? */
170 bool amd_iommu_snp_en;
171 EXPORT_SYMBOL(amd_iommu_snp_en);
173 LIST_HEAD(amd_iommu_pci_seg_list); /* list of all PCI segments */
174 LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the
177 /* Array to assign indices to IOMMUs*/
178 struct amd_iommu *amd_iommus[MAX_IOMMUS];
180 /* Number of IOMMUs present in the system */
181 static int amd_iommus_present;
183 /* IOMMUs have a non-present cache? */
184 bool amd_iommu_np_cache __read_mostly;
185 bool amd_iommu_iotlb_sup __read_mostly = true;
187 u32 amd_iommu_max_pasid __read_mostly = ~0;
189 bool amd_iommu_v2_present __read_mostly;
190 static bool amd_iommu_pc_present __read_mostly;
191 bool amdr_ivrs_remap_support __read_mostly;
193 bool amd_iommu_force_isolation __read_mostly;
196 * AMD IOMMU allows up to 2^16 different protection domains. This is a bitmap
197 * to know which ones are already in use.
199 unsigned long *amd_iommu_pd_alloc_bitmap;
201 enum iommu_init_state {
211 IOMMU_CMDLINE_DISABLED,
214 /* Early ioapic and hpet maps from kernel command line */
215 #define EARLY_MAP_SIZE 4
216 static struct devid_map __initdata early_ioapic_map[EARLY_MAP_SIZE];
217 static struct devid_map __initdata early_hpet_map[EARLY_MAP_SIZE];
218 static struct acpihid_map_entry __initdata early_acpihid_map[EARLY_MAP_SIZE];
220 static int __initdata early_ioapic_map_size;
221 static int __initdata early_hpet_map_size;
222 static int __initdata early_acpihid_map_size;
224 static bool __initdata cmdline_maps;
226 static enum iommu_init_state init_state = IOMMU_START_STATE;
228 static int amd_iommu_enable_interrupts(void);
229 static int __init iommu_go_to_state(enum iommu_init_state state);
230 static void init_device_table_dma(struct amd_iommu_pci_seg *pci_seg);
232 static bool amd_iommu_pre_enabled = true;
234 static u32 amd_iommu_ivinfo __initdata;
236 bool translation_pre_enabled(struct amd_iommu *iommu)
238 return (iommu->flags & AMD_IOMMU_FLAG_TRANS_PRE_ENABLED);
241 static void clear_translation_pre_enabled(struct amd_iommu *iommu)
243 iommu->flags &= ~AMD_IOMMU_FLAG_TRANS_PRE_ENABLED;
246 static void init_translation_status(struct amd_iommu *iommu)
250 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
251 if (ctrl & (1<<CONTROL_IOMMU_EN))
252 iommu->flags |= AMD_IOMMU_FLAG_TRANS_PRE_ENABLED;
255 static inline unsigned long tbl_size(int entry_size, int last_bdf)
257 unsigned shift = PAGE_SHIFT +
258 get_order((last_bdf + 1) * entry_size);
263 int amd_iommu_get_num_iommus(void)
265 return amd_iommus_present;
269 * Iterate through all the IOMMUs to get common EFR
270 * masks among all IOMMUs and warn if found inconsistency.
272 static void get_global_efr(void)
274 struct amd_iommu *iommu;
276 for_each_iommu(iommu) {
277 u64 tmp = iommu->features;
278 u64 tmp2 = iommu->features2;
280 if (list_is_first(&iommu->list, &amd_iommu_list)) {
282 amd_iommu_efr2 = tmp2;
286 if (amd_iommu_efr == tmp &&
287 amd_iommu_efr2 == tmp2)
291 "Found inconsistent EFR/EFR2 %#llx,%#llx (global %#llx,%#llx) on iommu%d (%04x:%02x:%02x.%01x).\n",
292 tmp, tmp2, amd_iommu_efr, amd_iommu_efr2,
293 iommu->index, iommu->pci_seg->id,
294 PCI_BUS_NUM(iommu->devid), PCI_SLOT(iommu->devid),
295 PCI_FUNC(iommu->devid));
297 amd_iommu_efr &= tmp;
298 amd_iommu_efr2 &= tmp2;
301 pr_info("Using global IVHD EFR:%#llx, EFR2:%#llx\n", amd_iommu_efr, amd_iommu_efr2);
304 static bool check_feature_on_all_iommus(u64 mask)
306 return !!(amd_iommu_efr & mask);
310 * For IVHD type 0x11/0x40, EFR is also available via IVHD.
311 * Default to IVHD EFR since it is available sooner
312 * (i.e. before PCI init).
314 static void __init early_iommu_features_init(struct amd_iommu *iommu,
315 struct ivhd_header *h)
317 if (amd_iommu_ivinfo & IOMMU_IVINFO_EFRSUP) {
318 iommu->features = h->efr_reg;
319 iommu->features2 = h->efr_reg2;
321 if (amd_iommu_ivinfo & IOMMU_IVINFO_DMA_REMAP)
322 amdr_ivrs_remap_support = true;
325 /* Access to l1 and l2 indexed register spaces */
327 static u32 iommu_read_l1(struct amd_iommu *iommu, u16 l1, u8 address)
331 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
332 pci_read_config_dword(iommu->dev, 0xfc, &val);
336 static void iommu_write_l1(struct amd_iommu *iommu, u16 l1, u8 address, u32 val)
338 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16 | 1 << 31));
339 pci_write_config_dword(iommu->dev, 0xfc, val);
340 pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
343 static u32 iommu_read_l2(struct amd_iommu *iommu, u8 address)
347 pci_write_config_dword(iommu->dev, 0xf0, address);
348 pci_read_config_dword(iommu->dev, 0xf4, &val);
352 static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val)
354 pci_write_config_dword(iommu->dev, 0xf0, (address | 1 << 8));
355 pci_write_config_dword(iommu->dev, 0xf4, val);
358 /****************************************************************************
360 * AMD IOMMU MMIO register space handling functions
362 * These functions are used to program the IOMMU device registers in
363 * MMIO space required for that driver.
365 ****************************************************************************/
368 * This function set the exclusion range in the IOMMU. DMA accesses to the
369 * exclusion range are passed through untranslated
371 static void iommu_set_exclusion_range(struct amd_iommu *iommu)
373 u64 start = iommu->exclusion_start & PAGE_MASK;
374 u64 limit = (start + iommu->exclusion_length - 1) & PAGE_MASK;
377 if (!iommu->exclusion_start)
380 entry = start | MMIO_EXCL_ENABLE_MASK;
381 memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
382 &entry, sizeof(entry));
385 memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
386 &entry, sizeof(entry));
389 static void iommu_set_cwwb_range(struct amd_iommu *iommu)
391 u64 start = iommu_virt_to_phys((void *)iommu->cmd_sem);
392 u64 entry = start & PM_ADDR_MASK;
394 if (!check_feature_on_all_iommus(FEATURE_SNP))
398 * Re-purpose Exclusion base/limit registers for Completion wait
399 * write-back base/limit.
401 memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
402 &entry, sizeof(entry));
405 * Default to 4 Kbytes, which can be specified by setting base
406 * address equal to the limit address.
408 memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
409 &entry, sizeof(entry));
412 /* Programs the physical address of the device table into the IOMMU hardware */
413 static void iommu_set_device_table(struct amd_iommu *iommu)
416 u32 dev_table_size = iommu->pci_seg->dev_table_size;
417 void *dev_table = (void *)get_dev_table(iommu);
419 BUG_ON(iommu->mmio_base == NULL);
421 entry = iommu_virt_to_phys(dev_table);
422 entry |= (dev_table_size >> 12) - 1;
423 memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET,
424 &entry, sizeof(entry));
427 /* Generic functions to enable/disable certain features of the IOMMU. */
428 static void iommu_feature_enable(struct amd_iommu *iommu, u8 bit)
432 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
433 ctrl |= (1ULL << bit);
434 writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
437 static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
441 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
442 ctrl &= ~(1ULL << bit);
443 writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
446 static void iommu_set_inv_tlb_timeout(struct amd_iommu *iommu, int timeout)
450 ctrl = readq(iommu->mmio_base + MMIO_CONTROL_OFFSET);
451 ctrl &= ~CTRL_INV_TO_MASK;
452 ctrl |= (timeout << CONTROL_INV_TIMEOUT) & CTRL_INV_TO_MASK;
453 writeq(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
456 /* Function to enable the hardware */
457 static void iommu_enable(struct amd_iommu *iommu)
459 iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
462 static void iommu_disable(struct amd_iommu *iommu)
464 if (!iommu->mmio_base)
467 /* Disable command buffer */
468 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
470 /* Disable event logging and event interrupts */
471 iommu_feature_disable(iommu, CONTROL_EVT_INT_EN);
472 iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
474 /* Disable IOMMU GA_LOG */
475 iommu_feature_disable(iommu, CONTROL_GALOG_EN);
476 iommu_feature_disable(iommu, CONTROL_GAINT_EN);
478 /* Disable IOMMU hardware itself */
479 iommu_feature_disable(iommu, CONTROL_IOMMU_EN);
483 * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in
484 * the system has one.
486 static u8 __iomem * __init iommu_map_mmio_space(u64 address, u64 end)
488 if (!request_mem_region(address, end, "amd_iommu")) {
489 pr_err("Can not reserve memory region %llx-%llx for mmio\n",
491 pr_err("This is a BIOS bug. Please contact your hardware vendor\n");
495 return (u8 __iomem *)ioremap(address, end);
498 static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu)
500 if (iommu->mmio_base)
501 iounmap(iommu->mmio_base);
502 release_mem_region(iommu->mmio_phys, iommu->mmio_phys_end);
505 static inline u32 get_ivhd_header_size(struct ivhd_header *h)
521 /****************************************************************************
523 * The functions below belong to the first pass of AMD IOMMU ACPI table
524 * parsing. In this pass we try to find out the highest device id this
525 * code has to handle. Upon this information the size of the shared data
526 * structures is determined later.
528 ****************************************************************************/
531 * This function calculates the length of a given IVHD entry
533 static inline int ivhd_entry_length(u8 *ivhd)
535 u32 type = ((struct ivhd_entry *)ivhd)->type;
538 return 0x04 << (*ivhd >> 6);
539 } else if (type == IVHD_DEV_ACPI_HID) {
540 /* For ACPI_HID, offset 21 is uid len */
541 return *((u8 *)ivhd + 21) + 22;
547 * After reading the highest device id from the IOMMU PCI capability header
548 * this function looks if there is a higher device id defined in the ACPI table
550 static int __init find_last_devid_from_ivhd(struct ivhd_header *h)
552 u8 *p = (void *)h, *end = (void *)h;
553 struct ivhd_entry *dev;
554 int last_devid = -EINVAL;
556 u32 ivhd_size = get_ivhd_header_size(h);
559 pr_err("Unsupported IVHD type %#x\n", h->type);
567 dev = (struct ivhd_entry *)p;
570 /* Use maximum BDF value for DEV_ALL */
572 case IVHD_DEV_SELECT:
573 case IVHD_DEV_RANGE_END:
575 case IVHD_DEV_EXT_SELECT:
576 /* all the above subfield types refer to device ids */
577 if (dev->devid > last_devid)
578 last_devid = dev->devid;
583 p += ivhd_entry_length(p);
591 static int __init check_ivrs_checksum(struct acpi_table_header *table)
594 u8 checksum = 0, *p = (u8 *)table;
596 for (i = 0; i < table->length; ++i)
599 /* ACPI table corrupt */
600 pr_err(FW_BUG "IVRS invalid checksum\n");
608 * Iterate over all IVHD entries in the ACPI table and find the highest device
609 * id which we need to handle. This is the first of three functions which parse
610 * the ACPI table. So we check the checksum here.
612 static int __init find_last_devid_acpi(struct acpi_table_header *table, u16 pci_seg)
614 u8 *p = (u8 *)table, *end = (u8 *)table;
615 struct ivhd_header *h;
616 int last_devid, last_bdf = 0;
618 p += IVRS_HEADER_LENGTH;
620 end += table->length;
622 h = (struct ivhd_header *)p;
623 if (h->pci_seg == pci_seg &&
624 h->type == amd_iommu_target_ivhd_type) {
625 last_devid = find_last_devid_from_ivhd(h);
629 if (last_devid > last_bdf)
630 last_bdf = last_devid;
639 /****************************************************************************
641 * The following functions belong to the code path which parses the ACPI table
642 * the second time. In this ACPI parsing iteration we allocate IOMMU specific
643 * data structures, initialize the per PCI segment device/alias/rlookup table
644 * and also basically initialize the hardware.
646 ****************************************************************************/
648 /* Allocate per PCI segment device table */
649 static inline int __init alloc_dev_table(struct amd_iommu_pci_seg *pci_seg)
651 pci_seg->dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO | GFP_DMA32,
652 get_order(pci_seg->dev_table_size));
653 if (!pci_seg->dev_table)
659 static inline void free_dev_table(struct amd_iommu_pci_seg *pci_seg)
661 free_pages((unsigned long)pci_seg->dev_table,
662 get_order(pci_seg->dev_table_size));
663 pci_seg->dev_table = NULL;
666 /* Allocate per PCI segment IOMMU rlookup table. */
667 static inline int __init alloc_rlookup_table(struct amd_iommu_pci_seg *pci_seg)
669 pci_seg->rlookup_table = (void *)__get_free_pages(
670 GFP_KERNEL | __GFP_ZERO,
671 get_order(pci_seg->rlookup_table_size));
672 if (pci_seg->rlookup_table == NULL)
678 static inline void free_rlookup_table(struct amd_iommu_pci_seg *pci_seg)
680 free_pages((unsigned long)pci_seg->rlookup_table,
681 get_order(pci_seg->rlookup_table_size));
682 pci_seg->rlookup_table = NULL;
685 static inline int __init alloc_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg)
687 pci_seg->irq_lookup_table = (void *)__get_free_pages(
688 GFP_KERNEL | __GFP_ZERO,
689 get_order(pci_seg->rlookup_table_size));
690 kmemleak_alloc(pci_seg->irq_lookup_table,
691 pci_seg->rlookup_table_size, 1, GFP_KERNEL);
692 if (pci_seg->irq_lookup_table == NULL)
698 static inline void free_irq_lookup_table(struct amd_iommu_pci_seg *pci_seg)
700 kmemleak_free(pci_seg->irq_lookup_table);
701 free_pages((unsigned long)pci_seg->irq_lookup_table,
702 get_order(pci_seg->rlookup_table_size));
703 pci_seg->irq_lookup_table = NULL;
706 static int __init alloc_alias_table(struct amd_iommu_pci_seg *pci_seg)
710 pci_seg->alias_table = (void *)__get_free_pages(GFP_KERNEL,
711 get_order(pci_seg->alias_table_size));
712 if (!pci_seg->alias_table)
716 * let all alias entries point to itself
718 for (i = 0; i <= pci_seg->last_bdf; ++i)
719 pci_seg->alias_table[i] = i;
724 static void __init free_alias_table(struct amd_iommu_pci_seg *pci_seg)
726 free_pages((unsigned long)pci_seg->alias_table,
727 get_order(pci_seg->alias_table_size));
728 pci_seg->alias_table = NULL;
732 * Allocates the command buffer. This buffer is per AMD IOMMU. We can
733 * write commands to that buffer later and the IOMMU will execute them
736 static int __init alloc_command_buffer(struct amd_iommu *iommu)
738 iommu->cmd_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
739 get_order(CMD_BUFFER_SIZE));
741 return iommu->cmd_buf ? 0 : -ENOMEM;
745 * This function restarts event logging in case the IOMMU experienced
746 * an event log buffer overflow.
748 void amd_iommu_restart_event_logging(struct amd_iommu *iommu)
750 iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
751 iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
755 * This function resets the command buffer if the IOMMU stopped fetching
758 static void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu)
760 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
762 writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
763 writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
764 iommu->cmd_buf_head = 0;
765 iommu->cmd_buf_tail = 0;
767 iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
771 * This function writes the command buffer address to the hardware and
774 static void iommu_enable_command_buffer(struct amd_iommu *iommu)
778 BUG_ON(iommu->cmd_buf == NULL);
780 entry = iommu_virt_to_phys(iommu->cmd_buf);
781 entry |= MMIO_CMD_SIZE_512;
783 memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
784 &entry, sizeof(entry));
786 amd_iommu_reset_cmd_buffer(iommu);
790 * This function disables the command buffer
792 static void iommu_disable_command_buffer(struct amd_iommu *iommu)
794 iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
797 static void __init free_command_buffer(struct amd_iommu *iommu)
799 free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE));
802 static void *__init iommu_alloc_4k_pages(struct amd_iommu *iommu,
803 gfp_t gfp, size_t size)
805 int order = get_order(size);
806 void *buf = (void *)__get_free_pages(gfp, order);
809 check_feature_on_all_iommus(FEATURE_SNP) &&
810 set_memory_4k((unsigned long)buf, (1 << order))) {
811 free_pages((unsigned long)buf, order);
818 /* allocates the memory where the IOMMU will log its events to */
819 static int __init alloc_event_buffer(struct amd_iommu *iommu)
821 iommu->evt_buf = iommu_alloc_4k_pages(iommu, GFP_KERNEL | __GFP_ZERO,
824 return iommu->evt_buf ? 0 : -ENOMEM;
827 static void iommu_enable_event_buffer(struct amd_iommu *iommu)
831 BUG_ON(iommu->evt_buf == NULL);
833 entry = iommu_virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK;
835 memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
836 &entry, sizeof(entry));
838 /* set head and tail to zero manually */
839 writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
840 writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
842 iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
846 * This function disables the event log buffer
848 static void iommu_disable_event_buffer(struct amd_iommu *iommu)
850 iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
853 static void __init free_event_buffer(struct amd_iommu *iommu)
855 free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE));
858 /* allocates the memory where the IOMMU will log its events to */
859 static int __init alloc_ppr_log(struct amd_iommu *iommu)
861 iommu->ppr_log = iommu_alloc_4k_pages(iommu, GFP_KERNEL | __GFP_ZERO,
864 return iommu->ppr_log ? 0 : -ENOMEM;
867 static void iommu_enable_ppr_log(struct amd_iommu *iommu)
871 if (iommu->ppr_log == NULL)
874 entry = iommu_virt_to_phys(iommu->ppr_log) | PPR_LOG_SIZE_512;
876 memcpy_toio(iommu->mmio_base + MMIO_PPR_LOG_OFFSET,
877 &entry, sizeof(entry));
879 /* set head and tail to zero manually */
880 writel(0x00, iommu->mmio_base + MMIO_PPR_HEAD_OFFSET);
881 writel(0x00, iommu->mmio_base + MMIO_PPR_TAIL_OFFSET);
883 iommu_feature_enable(iommu, CONTROL_PPRLOG_EN);
884 iommu_feature_enable(iommu, CONTROL_PPR_EN);
887 static void __init free_ppr_log(struct amd_iommu *iommu)
889 free_pages((unsigned long)iommu->ppr_log, get_order(PPR_LOG_SIZE));
892 static void free_ga_log(struct amd_iommu *iommu)
894 #ifdef CONFIG_IRQ_REMAP
895 free_pages((unsigned long)iommu->ga_log, get_order(GA_LOG_SIZE));
896 free_pages((unsigned long)iommu->ga_log_tail, get_order(8));
900 #ifdef CONFIG_IRQ_REMAP
901 static int iommu_ga_log_enable(struct amd_iommu *iommu)
909 entry = iommu_virt_to_phys(iommu->ga_log) | GA_LOG_SIZE_512;
910 memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_BASE_OFFSET,
911 &entry, sizeof(entry));
912 entry = (iommu_virt_to_phys(iommu->ga_log_tail) &
913 (BIT_ULL(52)-1)) & ~7ULL;
914 memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_TAIL_OFFSET,
915 &entry, sizeof(entry));
916 writel(0x00, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
917 writel(0x00, iommu->mmio_base + MMIO_GA_TAIL_OFFSET);
920 iommu_feature_enable(iommu, CONTROL_GAINT_EN);
921 iommu_feature_enable(iommu, CONTROL_GALOG_EN);
923 for (i = 0; i < LOOP_TIMEOUT; ++i) {
924 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
925 if (status & (MMIO_STATUS_GALOG_RUN_MASK))
930 if (WARN_ON(i >= LOOP_TIMEOUT))
936 static int iommu_init_ga_log(struct amd_iommu *iommu)
938 if (!AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
941 iommu->ga_log = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
942 get_order(GA_LOG_SIZE));
946 iommu->ga_log_tail = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
948 if (!iommu->ga_log_tail)
956 #endif /* CONFIG_IRQ_REMAP */
958 static int __init alloc_cwwb_sem(struct amd_iommu *iommu)
960 iommu->cmd_sem = iommu_alloc_4k_pages(iommu, GFP_KERNEL | __GFP_ZERO, 1);
962 return iommu->cmd_sem ? 0 : -ENOMEM;
965 static void __init free_cwwb_sem(struct amd_iommu *iommu)
968 free_page((unsigned long)iommu->cmd_sem);
971 static void iommu_enable_xt(struct amd_iommu *iommu)
973 #ifdef CONFIG_IRQ_REMAP
975 * XT mode (32-bit APIC destination ID) requires
976 * GA mode (128-bit IRTE support) as a prerequisite.
978 if (AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir) &&
979 amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
980 iommu_feature_enable(iommu, CONTROL_XT_EN);
981 #endif /* CONFIG_IRQ_REMAP */
984 static void iommu_enable_gt(struct amd_iommu *iommu)
986 if (!iommu_feature(iommu, FEATURE_GT))
989 iommu_feature_enable(iommu, CONTROL_GT_EN);
992 /* sets a specific bit in the device table entry. */
993 static void __set_dev_entry_bit(struct dev_table_entry *dev_table,
996 int i = (bit >> 6) & 0x03;
997 int _bit = bit & 0x3f;
999 dev_table[devid].data[i] |= (1UL << _bit);
1002 static void set_dev_entry_bit(struct amd_iommu *iommu, u16 devid, u8 bit)
1004 struct dev_table_entry *dev_table = get_dev_table(iommu);
1006 return __set_dev_entry_bit(dev_table, devid, bit);
1009 static int __get_dev_entry_bit(struct dev_table_entry *dev_table,
1012 int i = (bit >> 6) & 0x03;
1013 int _bit = bit & 0x3f;
1015 return (dev_table[devid].data[i] & (1UL << _bit)) >> _bit;
1018 static int get_dev_entry_bit(struct amd_iommu *iommu, u16 devid, u8 bit)
1020 struct dev_table_entry *dev_table = get_dev_table(iommu);
1022 return __get_dev_entry_bit(dev_table, devid, bit);
1025 static bool __copy_device_table(struct amd_iommu *iommu)
1027 u64 int_ctl, int_tab_len, entry = 0;
1028 struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
1029 struct dev_table_entry *old_devtb = NULL;
1030 u32 lo, hi, devid, old_devtb_size;
1031 phys_addr_t old_devtb_phys;
1032 u16 dom_id, dte_v, irq_v;
1036 /* Each IOMMU use separate device table with the same size */
1037 lo = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET);
1038 hi = readl(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET + 4);
1039 entry = (((u64) hi) << 32) + lo;
1041 old_devtb_size = ((entry & ~PAGE_MASK) + 1) << 12;
1042 if (old_devtb_size != pci_seg->dev_table_size) {
1043 pr_err("The device table size of IOMMU:%d is not expected!\n",
1049 * When SME is enabled in the first kernel, the entry includes the
1050 * memory encryption mask(sme_me_mask), we must remove the memory
1051 * encryption mask to obtain the true physical address in kdump kernel.
1053 old_devtb_phys = __sme_clr(entry) & PAGE_MASK;
1055 if (old_devtb_phys >= 0x100000000ULL) {
1056 pr_err("The address of old device table is above 4G, not trustworthy!\n");
1059 old_devtb = (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT) && is_kdump_kernel())
1060 ? (__force void *)ioremap_encrypted(old_devtb_phys,
1061 pci_seg->dev_table_size)
1062 : memremap(old_devtb_phys, pci_seg->dev_table_size, MEMREMAP_WB);
1067 gfp_flag = GFP_KERNEL | __GFP_ZERO | GFP_DMA32;
1068 pci_seg->old_dev_tbl_cpy = (void *)__get_free_pages(gfp_flag,
1069 get_order(pci_seg->dev_table_size));
1070 if (pci_seg->old_dev_tbl_cpy == NULL) {
1071 pr_err("Failed to allocate memory for copying old device table!\n");
1072 memunmap(old_devtb);
1076 for (devid = 0; devid <= pci_seg->last_bdf; ++devid) {
1077 pci_seg->old_dev_tbl_cpy[devid] = old_devtb[devid];
1078 dom_id = old_devtb[devid].data[1] & DEV_DOMID_MASK;
1079 dte_v = old_devtb[devid].data[0] & DTE_FLAG_V;
1081 if (dte_v && dom_id) {
1082 pci_seg->old_dev_tbl_cpy[devid].data[0] = old_devtb[devid].data[0];
1083 pci_seg->old_dev_tbl_cpy[devid].data[1] = old_devtb[devid].data[1];
1084 __set_bit(dom_id, amd_iommu_pd_alloc_bitmap);
1085 /* If gcr3 table existed, mask it out */
1086 if (old_devtb[devid].data[0] & DTE_FLAG_GV) {
1087 tmp = DTE_GCR3_VAL_B(~0ULL) << DTE_GCR3_SHIFT_B;
1088 tmp |= DTE_GCR3_VAL_C(~0ULL) << DTE_GCR3_SHIFT_C;
1089 pci_seg->old_dev_tbl_cpy[devid].data[1] &= ~tmp;
1090 tmp = DTE_GCR3_VAL_A(~0ULL) << DTE_GCR3_SHIFT_A;
1092 pci_seg->old_dev_tbl_cpy[devid].data[0] &= ~tmp;
1096 irq_v = old_devtb[devid].data[2] & DTE_IRQ_REMAP_ENABLE;
1097 int_ctl = old_devtb[devid].data[2] & DTE_IRQ_REMAP_INTCTL_MASK;
1098 int_tab_len = old_devtb[devid].data[2] & DTE_INTTABLEN_MASK;
1099 if (irq_v && (int_ctl || int_tab_len)) {
1100 if ((int_ctl != DTE_IRQ_REMAP_INTCTL) ||
1101 (int_tab_len != DTE_INTTABLEN)) {
1102 pr_err("Wrong old irq remapping flag: %#x\n", devid);
1103 memunmap(old_devtb);
1107 pci_seg->old_dev_tbl_cpy[devid].data[2] = old_devtb[devid].data[2];
1110 memunmap(old_devtb);
1115 static bool copy_device_table(void)
1117 struct amd_iommu *iommu;
1118 struct amd_iommu_pci_seg *pci_seg;
1120 if (!amd_iommu_pre_enabled)
1123 pr_warn("Translation is already enabled - trying to copy translation structures\n");
1126 * All IOMMUs within PCI segment shares common device table.
1127 * Hence copy device table only once per PCI segment.
1129 for_each_pci_segment(pci_seg) {
1130 for_each_iommu(iommu) {
1131 if (pci_seg->id != iommu->pci_seg->id)
1133 if (!__copy_device_table(iommu))
1142 void amd_iommu_apply_erratum_63(struct amd_iommu *iommu, u16 devid)
1146 sysmgt = get_dev_entry_bit(iommu, devid, DEV_ENTRY_SYSMGT1) |
1147 (get_dev_entry_bit(iommu, devid, DEV_ENTRY_SYSMGT2) << 1);
1150 set_dev_entry_bit(iommu, devid, DEV_ENTRY_IW);
1154 * This function takes the device specific flags read from the ACPI
1155 * table and sets up the device table entry with that information
1157 static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
1158 u16 devid, u32 flags, u32 ext_flags)
1160 if (flags & ACPI_DEVFLAG_INITPASS)
1161 set_dev_entry_bit(iommu, devid, DEV_ENTRY_INIT_PASS);
1162 if (flags & ACPI_DEVFLAG_EXTINT)
1163 set_dev_entry_bit(iommu, devid, DEV_ENTRY_EINT_PASS);
1164 if (flags & ACPI_DEVFLAG_NMI)
1165 set_dev_entry_bit(iommu, devid, DEV_ENTRY_NMI_PASS);
1166 if (flags & ACPI_DEVFLAG_SYSMGT1)
1167 set_dev_entry_bit(iommu, devid, DEV_ENTRY_SYSMGT1);
1168 if (flags & ACPI_DEVFLAG_SYSMGT2)
1169 set_dev_entry_bit(iommu, devid, DEV_ENTRY_SYSMGT2);
1170 if (flags & ACPI_DEVFLAG_LINT0)
1171 set_dev_entry_bit(iommu, devid, DEV_ENTRY_LINT0_PASS);
1172 if (flags & ACPI_DEVFLAG_LINT1)
1173 set_dev_entry_bit(iommu, devid, DEV_ENTRY_LINT1_PASS);
1175 amd_iommu_apply_erratum_63(iommu, devid);
1177 amd_iommu_set_rlookup_table(iommu, devid);
1180 int __init add_special_device(u8 type, u8 id, u32 *devid, bool cmd_line)
1182 struct devid_map *entry;
1183 struct list_head *list;
1185 if (type == IVHD_SPECIAL_IOAPIC)
1187 else if (type == IVHD_SPECIAL_HPET)
1192 list_for_each_entry(entry, list, list) {
1193 if (!(entry->id == id && entry->cmd_line))
1196 pr_info("Command-line override present for %s id %d - ignoring\n",
1197 type == IVHD_SPECIAL_IOAPIC ? "IOAPIC" : "HPET", id);
1199 *devid = entry->devid;
1204 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1209 entry->devid = *devid;
1210 entry->cmd_line = cmd_line;
1212 list_add_tail(&entry->list, list);
1217 static int __init add_acpi_hid_device(u8 *hid, u8 *uid, u32 *devid,
1220 struct acpihid_map_entry *entry;
1221 struct list_head *list = &acpihid_map;
1223 list_for_each_entry(entry, list, list) {
1224 if (strcmp(entry->hid, hid) ||
1225 (*uid && *entry->uid && strcmp(entry->uid, uid)) ||
1229 pr_info("Command-line override for hid:%s uid:%s\n",
1231 *devid = entry->devid;
1235 entry = kzalloc(sizeof(*entry), GFP_KERNEL);
1239 memcpy(entry->uid, uid, strlen(uid));
1240 memcpy(entry->hid, hid, strlen(hid));
1241 entry->devid = *devid;
1242 entry->cmd_line = cmd_line;
1243 entry->root_devid = (entry->devid & (~0x7));
1245 pr_info("%s, add hid:%s, uid:%s, rdevid:%d\n",
1246 entry->cmd_line ? "cmd" : "ivrs",
1247 entry->hid, entry->uid, entry->root_devid);
1249 list_add_tail(&entry->list, list);
1253 static int __init add_early_maps(void)
1257 for (i = 0; i < early_ioapic_map_size; ++i) {
1258 ret = add_special_device(IVHD_SPECIAL_IOAPIC,
1259 early_ioapic_map[i].id,
1260 &early_ioapic_map[i].devid,
1261 early_ioapic_map[i].cmd_line);
1266 for (i = 0; i < early_hpet_map_size; ++i) {
1267 ret = add_special_device(IVHD_SPECIAL_HPET,
1268 early_hpet_map[i].id,
1269 &early_hpet_map[i].devid,
1270 early_hpet_map[i].cmd_line);
1275 for (i = 0; i < early_acpihid_map_size; ++i) {
1276 ret = add_acpi_hid_device(early_acpihid_map[i].hid,
1277 early_acpihid_map[i].uid,
1278 &early_acpihid_map[i].devid,
1279 early_acpihid_map[i].cmd_line);
1288 * Takes a pointer to an AMD IOMMU entry in the ACPI table and
1289 * initializes the hardware and our data structures with it.
1291 static int __init init_iommu_from_acpi(struct amd_iommu *iommu,
1292 struct ivhd_header *h)
1295 u8 *end = p, flags = 0;
1296 u16 devid = 0, devid_start = 0, devid_to = 0, seg_id;
1297 u32 dev_i, ext_flags = 0;
1299 struct ivhd_entry *e;
1300 struct amd_iommu_pci_seg *pci_seg = iommu->pci_seg;
1305 ret = add_early_maps();
1309 amd_iommu_apply_ivrs_quirks();
1312 * First save the recommended feature enable bits from ACPI
1314 iommu->acpi_flags = h->flags;
1317 * Done. Now parse the device entries
1319 ivhd_size = get_ivhd_header_size(h);
1321 pr_err("Unsupported IVHD type %#x\n", h->type);
1331 e = (struct ivhd_entry *)p;
1332 seg_id = pci_seg->id;
1337 DUMP_printk(" DEV_ALL\t\t\tflags: %02x\n", e->flags);
1339 for (dev_i = 0; dev_i <= pci_seg->last_bdf; ++dev_i)
1340 set_dev_entry_from_acpi(iommu, dev_i, e->flags, 0);
1342 case IVHD_DEV_SELECT:
1344 DUMP_printk(" DEV_SELECT\t\t\t devid: %04x:%02x:%02x.%x "
1346 seg_id, PCI_BUS_NUM(e->devid),
1352 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
1354 case IVHD_DEV_SELECT_RANGE_START:
1356 DUMP_printk(" DEV_SELECT_RANGE_START\t "
1357 "devid: %04x:%02x:%02x.%x flags: %02x\n",
1358 seg_id, PCI_BUS_NUM(e->devid),
1363 devid_start = e->devid;
1368 case IVHD_DEV_ALIAS:
1370 DUMP_printk(" DEV_ALIAS\t\t\t devid: %04x:%02x:%02x.%x "
1371 "flags: %02x devid_to: %02x:%02x.%x\n",
1372 seg_id, PCI_BUS_NUM(e->devid),
1376 PCI_BUS_NUM(e->ext >> 8),
1377 PCI_SLOT(e->ext >> 8),
1378 PCI_FUNC(e->ext >> 8));
1381 devid_to = e->ext >> 8;
1382 set_dev_entry_from_acpi(iommu, devid , e->flags, 0);
1383 set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0);
1384 pci_seg->alias_table[devid] = devid_to;
1386 case IVHD_DEV_ALIAS_RANGE:
1388 DUMP_printk(" DEV_ALIAS_RANGE\t\t "
1389 "devid: %04x:%02x:%02x.%x flags: %02x "
1390 "devid_to: %04x:%02x:%02x.%x\n",
1391 seg_id, PCI_BUS_NUM(e->devid),
1395 seg_id, PCI_BUS_NUM(e->ext >> 8),
1396 PCI_SLOT(e->ext >> 8),
1397 PCI_FUNC(e->ext >> 8));
1399 devid_start = e->devid;
1401 devid_to = e->ext >> 8;
1405 case IVHD_DEV_EXT_SELECT:
1407 DUMP_printk(" DEV_EXT_SELECT\t\t devid: %04x:%02x:%02x.%x "
1408 "flags: %02x ext: %08x\n",
1409 seg_id, PCI_BUS_NUM(e->devid),
1415 set_dev_entry_from_acpi(iommu, devid, e->flags,
1418 case IVHD_DEV_EXT_SELECT_RANGE:
1420 DUMP_printk(" DEV_EXT_SELECT_RANGE\t devid: "
1421 "%04x:%02x:%02x.%x flags: %02x ext: %08x\n",
1422 seg_id, PCI_BUS_NUM(e->devid),
1427 devid_start = e->devid;
1432 case IVHD_DEV_RANGE_END:
1434 DUMP_printk(" DEV_RANGE_END\t\t devid: %04x:%02x:%02x.%x\n",
1435 seg_id, PCI_BUS_NUM(e->devid),
1437 PCI_FUNC(e->devid));
1440 for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
1442 pci_seg->alias_table[dev_i] = devid_to;
1443 set_dev_entry_from_acpi(iommu,
1444 devid_to, flags, ext_flags);
1446 set_dev_entry_from_acpi(iommu, dev_i,
1450 case IVHD_DEV_SPECIAL: {
1456 handle = e->ext & 0xff;
1457 devid = PCI_SEG_DEVID_TO_SBDF(seg_id, (e->ext >> 8));
1458 type = (e->ext >> 24) & 0xff;
1460 if (type == IVHD_SPECIAL_IOAPIC)
1462 else if (type == IVHD_SPECIAL_HPET)
1467 DUMP_printk(" DEV_SPECIAL(%s[%d])\t\tdevid: %04x:%02x:%02x.%x\n",
1469 seg_id, PCI_BUS_NUM(devid),
1473 ret = add_special_device(type, handle, &devid, false);
1478 * add_special_device might update the devid in case a
1479 * command-line override is present. So call
1480 * set_dev_entry_from_acpi after add_special_device.
1482 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
1486 case IVHD_DEV_ACPI_HID: {
1488 u8 hid[ACPIHID_HID_LEN];
1489 u8 uid[ACPIHID_UID_LEN];
1492 if (h->type != 0x40) {
1493 pr_err(FW_BUG "Invalid IVHD device type %#x\n",
1498 BUILD_BUG_ON(sizeof(e->ext_hid) != ACPIHID_HID_LEN - 1);
1499 memcpy(hid, &e->ext_hid, ACPIHID_HID_LEN - 1);
1500 hid[ACPIHID_HID_LEN - 1] = '\0';
1503 pr_err(FW_BUG "Invalid HID.\n");
1509 case UID_NOT_PRESENT:
1512 pr_warn(FW_BUG "Invalid UID length.\n");
1515 case UID_IS_INTEGER:
1517 sprintf(uid, "%d", e->uid);
1520 case UID_IS_CHARACTER:
1522 memcpy(uid, &e->uid, e->uidl);
1523 uid[e->uidl] = '\0';
1530 devid = PCI_SEG_DEVID_TO_SBDF(seg_id, e->devid);
1531 DUMP_printk(" DEV_ACPI_HID(%s[%s])\t\tdevid: %04x:%02x:%02x.%x\n",
1539 ret = add_acpi_hid_device(hid, uid, &devid, false);
1544 * add_special_device might update the devid in case a
1545 * command-line override is present. So call
1546 * set_dev_entry_from_acpi after add_special_device.
1548 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
1556 p += ivhd_entry_length(p);
1562 /* Allocate PCI segment data structure */
1563 static struct amd_iommu_pci_seg *__init alloc_pci_segment(u16 id,
1564 struct acpi_table_header *ivrs_base)
1566 struct amd_iommu_pci_seg *pci_seg;
1570 * First parse ACPI tables to find the largest Bus/Dev/Func we need to
1571 * handle in this PCI segment. Upon this information the shared data
1572 * structures for the PCI segments in the system will be allocated.
1574 last_bdf = find_last_devid_acpi(ivrs_base, id);
1578 pci_seg = kzalloc(sizeof(struct amd_iommu_pci_seg), GFP_KERNEL);
1579 if (pci_seg == NULL)
1582 pci_seg->last_bdf = last_bdf;
1583 DUMP_printk("PCI segment : 0x%0x, last bdf : 0x%04x\n", id, last_bdf);
1584 pci_seg->dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE, last_bdf);
1585 pci_seg->alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE, last_bdf);
1586 pci_seg->rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE, last_bdf);
1589 init_llist_head(&pci_seg->dev_data_list);
1590 INIT_LIST_HEAD(&pci_seg->unity_map);
1591 list_add_tail(&pci_seg->list, &amd_iommu_pci_seg_list);
1593 if (alloc_dev_table(pci_seg))
1595 if (alloc_alias_table(pci_seg))
1597 if (alloc_rlookup_table(pci_seg))
1603 static struct amd_iommu_pci_seg *__init get_pci_segment(u16 id,
1604 struct acpi_table_header *ivrs_base)
1606 struct amd_iommu_pci_seg *pci_seg;
1608 for_each_pci_segment(pci_seg) {
1609 if (pci_seg->id == id)
1613 return alloc_pci_segment(id, ivrs_base);
1616 static void __init free_pci_segments(void)
1618 struct amd_iommu_pci_seg *pci_seg, *next;
1620 for_each_pci_segment_safe(pci_seg, next) {
1621 list_del(&pci_seg->list);
1622 free_irq_lookup_table(pci_seg);
1623 free_rlookup_table(pci_seg);
1624 free_alias_table(pci_seg);
1625 free_dev_table(pci_seg);
1630 static void __init free_iommu_one(struct amd_iommu *iommu)
1632 free_cwwb_sem(iommu);
1633 free_command_buffer(iommu);
1634 free_event_buffer(iommu);
1635 free_ppr_log(iommu);
1637 iommu_unmap_mmio_space(iommu);
1640 static void __init free_iommu_all(void)
1642 struct amd_iommu *iommu, *next;
1644 for_each_iommu_safe(iommu, next) {
1645 list_del(&iommu->list);
1646 free_iommu_one(iommu);
1652 * Family15h Model 10h-1fh erratum 746 (IOMMU Logging May Stall Translations)
1654 * BIOS should disable L2B micellaneous clock gating by setting
1655 * L2_L2B_CK_GATE_CONTROL[CKGateL2BMiscDisable](D0F2xF4_x90[2]) = 1b
1657 static void amd_iommu_erratum_746_workaround(struct amd_iommu *iommu)
1661 if ((boot_cpu_data.x86 != 0x15) ||
1662 (boot_cpu_data.x86_model < 0x10) ||
1663 (boot_cpu_data.x86_model > 0x1f))
1666 pci_write_config_dword(iommu->dev, 0xf0, 0x90);
1667 pci_read_config_dword(iommu->dev, 0xf4, &value);
1672 /* Select NB indirect register 0x90 and enable writing */
1673 pci_write_config_dword(iommu->dev, 0xf0, 0x90 | (1 << 8));
1675 pci_write_config_dword(iommu->dev, 0xf4, value | 0x4);
1676 pci_info(iommu->dev, "Applying erratum 746 workaround\n");
1678 /* Clear the enable writing bit */
1679 pci_write_config_dword(iommu->dev, 0xf0, 0x90);
1683 * Family15h Model 30h-3fh (IOMMU Mishandles ATS Write Permission)
1685 * BIOS should enable ATS write permission check by setting
1686 * L2_DEBUG_3[AtsIgnoreIWDis](D0F2xF4_x47[0]) = 1b
1688 static void amd_iommu_ats_write_check_workaround(struct amd_iommu *iommu)
1692 if ((boot_cpu_data.x86 != 0x15) ||
1693 (boot_cpu_data.x86_model < 0x30) ||
1694 (boot_cpu_data.x86_model > 0x3f))
1697 /* Test L2_DEBUG_3[AtsIgnoreIWDis] == 1 */
1698 value = iommu_read_l2(iommu, 0x47);
1703 /* Set L2_DEBUG_3[AtsIgnoreIWDis] = 1 */
1704 iommu_write_l2(iommu, 0x47, value | BIT(0));
1706 pci_info(iommu->dev, "Applying ATS write check workaround\n");
1710 * This function glues the initialization function for one IOMMU
1711 * together and also allocates the command buffer and programs the
1712 * hardware. It does NOT enable the IOMMU. This is done afterwards.
1714 static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h,
1715 struct acpi_table_header *ivrs_base)
1717 struct amd_iommu_pci_seg *pci_seg;
1719 pci_seg = get_pci_segment(h->pci_seg, ivrs_base);
1720 if (pci_seg == NULL)
1722 iommu->pci_seg = pci_seg;
1724 raw_spin_lock_init(&iommu->lock);
1725 iommu->cmd_sem_val = 0;
1727 /* Add IOMMU to internal data structures */
1728 list_add_tail(&iommu->list, &amd_iommu_list);
1729 iommu->index = amd_iommus_present++;
1731 if (unlikely(iommu->index >= MAX_IOMMUS)) {
1732 WARN(1, "System has more IOMMUs than supported by this driver\n");
1736 /* Index is fine - add IOMMU to the array */
1737 amd_iommus[iommu->index] = iommu;
1740 * Copy data from ACPI table entry to the iommu struct
1742 iommu->devid = h->devid;
1743 iommu->cap_ptr = h->cap_ptr;
1744 iommu->mmio_phys = h->mmio_phys;
1748 /* Check if IVHD EFR contains proper max banks/counters */
1749 if ((h->efr_attr != 0) &&
1750 ((h->efr_attr & (0xF << 13)) != 0) &&
1751 ((h->efr_attr & (0x3F << 17)) != 0))
1752 iommu->mmio_phys_end = MMIO_REG_END_OFFSET;
1754 iommu->mmio_phys_end = MMIO_CNTR_CONF_OFFSET;
1757 * Note: GA (128-bit IRTE) mode requires cmpxchg16b supports.
1758 * GAM also requires GA mode. Therefore, we need to
1759 * check cmpxchg16b support before enabling it.
1761 if (!boot_cpu_has(X86_FEATURE_CX16) ||
1762 ((h->efr_attr & (0x1 << IOMMU_FEAT_GASUP_SHIFT)) == 0))
1763 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;
1767 if (h->efr_reg & (1 << 9))
1768 iommu->mmio_phys_end = MMIO_REG_END_OFFSET;
1770 iommu->mmio_phys_end = MMIO_CNTR_CONF_OFFSET;
1773 * Note: GA (128-bit IRTE) mode requires cmpxchg16b supports.
1774 * XT, GAM also requires GA mode. Therefore, we need to
1775 * check cmpxchg16b support before enabling them.
1777 if (!boot_cpu_has(X86_FEATURE_CX16) ||
1778 ((h->efr_reg & (0x1 << IOMMU_EFR_GASUP_SHIFT)) == 0)) {
1779 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY;
1783 if (h->efr_reg & BIT(IOMMU_EFR_XTSUP_SHIFT))
1784 amd_iommu_xt_mode = IRQ_REMAP_X2APIC_MODE;
1786 early_iommu_features_init(iommu, h);
1793 iommu->mmio_base = iommu_map_mmio_space(iommu->mmio_phys,
1794 iommu->mmio_phys_end);
1795 if (!iommu->mmio_base)
1798 return init_iommu_from_acpi(iommu, h);
1801 static int __init init_iommu_one_late(struct amd_iommu *iommu)
1805 if (alloc_cwwb_sem(iommu))
1808 if (alloc_command_buffer(iommu))
1811 if (alloc_event_buffer(iommu))
1814 iommu->int_enabled = false;
1816 init_translation_status(iommu);
1817 if (translation_pre_enabled(iommu) && !is_kdump_kernel()) {
1818 iommu_disable(iommu);
1819 clear_translation_pre_enabled(iommu);
1820 pr_warn("Translation was enabled for IOMMU:%d but we are not in kdump mode\n",
1823 if (amd_iommu_pre_enabled)
1824 amd_iommu_pre_enabled = translation_pre_enabled(iommu);
1826 if (amd_iommu_irq_remap) {
1827 ret = amd_iommu_create_irq_domain(iommu);
1833 * Make sure IOMMU is not considered to translate itself. The IVRS
1834 * table tells us so, but this is a lie!
1836 iommu->pci_seg->rlookup_table[iommu->devid] = NULL;
1842 * get_highest_supported_ivhd_type - Look up the appropriate IVHD type
1843 * @ivrs: Pointer to the IVRS header
1845 * This function search through all IVDB of the maximum supported IVHD
1847 static u8 get_highest_supported_ivhd_type(struct acpi_table_header *ivrs)
1849 u8 *base = (u8 *)ivrs;
1850 struct ivhd_header *ivhd = (struct ivhd_header *)
1851 (base + IVRS_HEADER_LENGTH);
1852 u8 last_type = ivhd->type;
1853 u16 devid = ivhd->devid;
1855 while (((u8 *)ivhd - base < ivrs->length) &&
1856 (ivhd->type <= ACPI_IVHD_TYPE_MAX_SUPPORTED)) {
1857 u8 *p = (u8 *) ivhd;
1859 if (ivhd->devid == devid)
1860 last_type = ivhd->type;
1861 ivhd = (struct ivhd_header *)(p + ivhd->length);
1868 * Iterates over all IOMMU entries in the ACPI table, allocates the
1869 * IOMMU structure and initializes it with init_iommu_one()
1871 static int __init init_iommu_all(struct acpi_table_header *table)
1873 u8 *p = (u8 *)table, *end = (u8 *)table;
1874 struct ivhd_header *h;
1875 struct amd_iommu *iommu;
1878 end += table->length;
1879 p += IVRS_HEADER_LENGTH;
1881 /* Phase 1: Process all IVHD blocks */
1883 h = (struct ivhd_header *)p;
1884 if (*p == amd_iommu_target_ivhd_type) {
1886 DUMP_printk("device: %04x:%02x:%02x.%01x cap: %04x "
1887 "flags: %01x info %04x\n",
1888 h->pci_seg, PCI_BUS_NUM(h->devid),
1889 PCI_SLOT(h->devid), PCI_FUNC(h->devid),
1890 h->cap_ptr, h->flags, h->info);
1891 DUMP_printk(" mmio-addr: %016llx\n",
1894 iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
1898 ret = init_iommu_one(iommu, h, table);
1907 /* Phase 2 : Early feature support check */
1910 /* Phase 3 : Enabling IOMMU features */
1911 for_each_iommu(iommu) {
1912 ret = init_iommu_one_late(iommu);
1920 static void init_iommu_perf_ctr(struct amd_iommu *iommu)
1923 struct pci_dev *pdev = iommu->dev;
1925 if (!iommu_feature(iommu, FEATURE_PC))
1928 amd_iommu_pc_present = true;
1930 pci_info(pdev, "IOMMU performance counters supported\n");
1932 val = readl(iommu->mmio_base + MMIO_CNTR_CONF_OFFSET);
1933 iommu->max_banks = (u8) ((val >> 12) & 0x3f);
1934 iommu->max_counters = (u8) ((val >> 7) & 0xf);
1939 static ssize_t amd_iommu_show_cap(struct device *dev,
1940 struct device_attribute *attr,
1943 struct amd_iommu *iommu = dev_to_amd_iommu(dev);
1944 return sprintf(buf, "%x\n", iommu->cap);
1946 static DEVICE_ATTR(cap, S_IRUGO, amd_iommu_show_cap, NULL);
1948 static ssize_t amd_iommu_show_features(struct device *dev,
1949 struct device_attribute *attr,
1952 struct amd_iommu *iommu = dev_to_amd_iommu(dev);
1953 return sprintf(buf, "%llx:%llx\n", iommu->features2, iommu->features);
1955 static DEVICE_ATTR(features, S_IRUGO, amd_iommu_show_features, NULL);
1957 static struct attribute *amd_iommu_attrs[] = {
1959 &dev_attr_features.attr,
1963 static struct attribute_group amd_iommu_group = {
1964 .name = "amd-iommu",
1965 .attrs = amd_iommu_attrs,
1968 static const struct attribute_group *amd_iommu_groups[] = {
1974 * Note: IVHD 0x11 and 0x40 also contains exact copy
1975 * of the IOMMU Extended Feature Register [MMIO Offset 0030h].
1976 * Default to EFR in IVHD since it is available sooner (i.e. before PCI init).
1978 static void __init late_iommu_features_init(struct amd_iommu *iommu)
1980 u64 features, features2;
1982 if (!(iommu->cap & (1 << IOMMU_CAP_EFR)))
1985 /* read extended feature bits */
1986 features = readq(iommu->mmio_base + MMIO_EXT_FEATURES);
1987 features2 = readq(iommu->mmio_base + MMIO_EXT_FEATURES2);
1989 if (!iommu->features) {
1990 iommu->features = features;
1991 iommu->features2 = features2;
1996 * Sanity check and warn if EFR values from
1997 * IVHD and MMIO conflict.
1999 if (features != iommu->features ||
2000 features2 != iommu->features2) {
2002 "EFR mismatch. Use IVHD EFR (%#llx : %#llx), EFR2 (%#llx : %#llx).\n",
2003 features, iommu->features,
2004 features2, iommu->features2);
2008 static int __init iommu_init_pci(struct amd_iommu *iommu)
2010 int cap_ptr = iommu->cap_ptr;
2013 iommu->dev = pci_get_domain_bus_and_slot(iommu->pci_seg->id,
2014 PCI_BUS_NUM(iommu->devid),
2015 iommu->devid & 0xff);
2019 /* Prevent binding other PCI device drivers to IOMMU devices */
2020 iommu->dev->match_driver = false;
2022 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
2025 if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
2026 amd_iommu_iotlb_sup = false;
2028 late_iommu_features_init(iommu);
2030 if (iommu_feature(iommu, FEATURE_GT)) {
2035 pasmax = iommu->features & FEATURE_PASID_MASK;
2036 pasmax >>= FEATURE_PASID_SHIFT;
2037 max_pasid = (1 << (pasmax + 1)) - 1;
2039 amd_iommu_max_pasid = min(amd_iommu_max_pasid, max_pasid);
2041 BUG_ON(amd_iommu_max_pasid & ~PASID_MASK);
2043 glxval = iommu->features & FEATURE_GLXVAL_MASK;
2044 glxval >>= FEATURE_GLXVAL_SHIFT;
2046 if (amd_iommu_max_glx_val == -1)
2047 amd_iommu_max_glx_val = glxval;
2049 amd_iommu_max_glx_val = min(amd_iommu_max_glx_val, glxval);
2052 if (iommu_feature(iommu, FEATURE_GT) &&
2053 iommu_feature(iommu, FEATURE_PPR)) {
2054 iommu->is_iommu_v2 = true;
2055 amd_iommu_v2_present = true;
2058 if (iommu_feature(iommu, FEATURE_PPR) && alloc_ppr_log(iommu))
2061 if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE)) {
2062 pr_info("Using strict mode due to virtualization\n");
2063 iommu_set_dma_strict();
2064 amd_iommu_np_cache = true;
2067 init_iommu_perf_ctr(iommu);
2069 if (amd_iommu_pgtable == AMD_IOMMU_V2) {
2070 if (!iommu_feature(iommu, FEATURE_GIOSUP) ||
2071 !iommu_feature(iommu, FEATURE_GT)) {
2072 pr_warn("Cannot enable v2 page table for DMA-API. Fallback to v1.\n");
2073 amd_iommu_pgtable = AMD_IOMMU_V1;
2074 } else if (iommu_default_passthrough()) {
2075 pr_warn("V2 page table doesn't support passthrough mode. Fallback to v1.\n");
2076 amd_iommu_pgtable = AMD_IOMMU_V1;
2080 if (is_rd890_iommu(iommu->dev)) {
2084 pci_get_domain_bus_and_slot(iommu->pci_seg->id,
2085 iommu->dev->bus->number,
2089 * Some rd890 systems may not be fully reconfigured by the
2090 * BIOS, so it's necessary for us to store this information so
2091 * it can be reprogrammed on resume
2093 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 4,
2094 &iommu->stored_addr_lo);
2095 pci_read_config_dword(iommu->dev, iommu->cap_ptr + 8,
2096 &iommu->stored_addr_hi);
2098 /* Low bit locks writes to configuration space */
2099 iommu->stored_addr_lo &= ~1;
2101 for (i = 0; i < 6; i++)
2102 for (j = 0; j < 0x12; j++)
2103 iommu->stored_l1[i][j] = iommu_read_l1(iommu, i, j);
2105 for (i = 0; i < 0x83; i++)
2106 iommu->stored_l2[i] = iommu_read_l2(iommu, i);
2109 amd_iommu_erratum_746_workaround(iommu);
2110 amd_iommu_ats_write_check_workaround(iommu);
2112 ret = iommu_device_sysfs_add(&iommu->iommu, &iommu->dev->dev,
2113 amd_iommu_groups, "ivhd%d", iommu->index);
2117 iommu_device_register(&iommu->iommu, &amd_iommu_ops, NULL);
2119 return pci_enable_device(iommu->dev);
2122 static void print_iommu_info(void)
2124 static const char * const feat_str[] = {
2125 "PreF", "PPR", "X2APIC", "NX", "GT", "[5]",
2126 "IA", "GA", "HE", "PC"
2128 struct amd_iommu *iommu;
2130 for_each_iommu(iommu) {
2131 struct pci_dev *pdev = iommu->dev;
2134 pci_info(pdev, "Found IOMMU cap 0x%x\n", iommu->cap_ptr);
2136 if (iommu->cap & (1 << IOMMU_CAP_EFR)) {
2137 pr_info("Extended features (%#llx, %#llx):", iommu->features, iommu->features2);
2139 for (i = 0; i < ARRAY_SIZE(feat_str); ++i) {
2140 if (iommu_feature(iommu, (1ULL << i)))
2141 pr_cont(" %s", feat_str[i]);
2144 if (iommu->features & FEATURE_GAM_VAPIC)
2145 pr_cont(" GA_vAPIC");
2147 if (iommu->features & FEATURE_SNP)
2153 if (irq_remapping_enabled) {
2154 pr_info("Interrupt remapping enabled\n");
2155 if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
2156 pr_info("X2APIC enabled\n");
2158 if (amd_iommu_pgtable == AMD_IOMMU_V2)
2159 pr_info("V2 page table enabled\n");
2162 static int __init amd_iommu_init_pci(void)
2164 struct amd_iommu *iommu;
2165 struct amd_iommu_pci_seg *pci_seg;
2168 for_each_iommu(iommu) {
2169 ret = iommu_init_pci(iommu);
2171 pr_err("IOMMU%d: Failed to initialize IOMMU Hardware (error=%d)!\n",
2175 /* Need to setup range after PCI init */
2176 iommu_set_cwwb_range(iommu);
2180 * Order is important here to make sure any unity map requirements are
2181 * fulfilled. The unity mappings are created and written to the device
2182 * table during the iommu_init_pci() call.
2184 * After that we call init_device_table_dma() to make sure any
2185 * uninitialized DTE will block DMA, and in the end we flush the caches
2186 * of all IOMMUs to make sure the changes to the device table are
2189 for_each_pci_segment(pci_seg)
2190 init_device_table_dma(pci_seg);
2192 for_each_iommu(iommu)
2193 iommu_flush_all_caches(iommu);
2201 /****************************************************************************
2203 * The following functions initialize the MSI interrupts for all IOMMUs
2204 * in the system. It's a bit challenging because there could be multiple
2205 * IOMMUs per PCI BDF but we can call pci_enable_msi(x) only once per
2208 ****************************************************************************/
2210 static int iommu_setup_msi(struct amd_iommu *iommu)
2214 r = pci_enable_msi(iommu->dev);
2218 r = request_threaded_irq(iommu->dev->irq,
2219 amd_iommu_int_handler,
2220 amd_iommu_int_thread,
2225 pci_disable_msi(iommu->dev);
2236 dest_mode_logical : 1,
2243 } __attribute__ ((packed));
2246 static struct irq_chip intcapxt_controller;
2248 static int intcapxt_irqdomain_activate(struct irq_domain *domain,
2249 struct irq_data *irqd, bool reserve)
2254 static void intcapxt_irqdomain_deactivate(struct irq_domain *domain,
2255 struct irq_data *irqd)
2260 static int intcapxt_irqdomain_alloc(struct irq_domain *domain, unsigned int virq,
2261 unsigned int nr_irqs, void *arg)
2263 struct irq_alloc_info *info = arg;
2266 if (!info || info->type != X86_IRQ_ALLOC_TYPE_AMDVI)
2269 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
2273 for (i = virq; i < virq + nr_irqs; i++) {
2274 struct irq_data *irqd = irq_domain_get_irq_data(domain, i);
2276 irqd->chip = &intcapxt_controller;
2277 irqd->chip_data = info->data;
2278 __irq_set_handler(i, handle_edge_irq, 0, "edge");
2284 static void intcapxt_irqdomain_free(struct irq_domain *domain, unsigned int virq,
2285 unsigned int nr_irqs)
2287 irq_domain_free_irqs_top(domain, virq, nr_irqs);
2291 static void intcapxt_unmask_irq(struct irq_data *irqd)
2293 struct amd_iommu *iommu = irqd->chip_data;
2294 struct irq_cfg *cfg = irqd_cfg(irqd);
2298 xt.dest_mode_logical = apic->dest_mode_logical;
2299 xt.vector = cfg->vector;
2300 xt.destid_0_23 = cfg->dest_apicid & GENMASK(23, 0);
2301 xt.destid_24_31 = cfg->dest_apicid >> 24;
2304 * Current IOMMU implementation uses the same IRQ for all
2305 * 3 IOMMU interrupts.
2307 writeq(xt.capxt, iommu->mmio_base + MMIO_INTCAPXT_EVT_OFFSET);
2308 writeq(xt.capxt, iommu->mmio_base + MMIO_INTCAPXT_PPR_OFFSET);
2309 writeq(xt.capxt, iommu->mmio_base + MMIO_INTCAPXT_GALOG_OFFSET);
2312 static void intcapxt_mask_irq(struct irq_data *irqd)
2314 struct amd_iommu *iommu = irqd->chip_data;
2316 writeq(0, iommu->mmio_base + MMIO_INTCAPXT_EVT_OFFSET);
2317 writeq(0, iommu->mmio_base + MMIO_INTCAPXT_PPR_OFFSET);
2318 writeq(0, iommu->mmio_base + MMIO_INTCAPXT_GALOG_OFFSET);
2322 static int intcapxt_set_affinity(struct irq_data *irqd,
2323 const struct cpumask *mask, bool force)
2325 struct irq_data *parent = irqd->parent_data;
2328 ret = parent->chip->irq_set_affinity(parent, mask, force);
2329 if (ret < 0 || ret == IRQ_SET_MASK_OK_DONE)
2334 static int intcapxt_set_wake(struct irq_data *irqd, unsigned int on)
2336 return on ? -EOPNOTSUPP : 0;
2339 static struct irq_chip intcapxt_controller = {
2340 .name = "IOMMU-MSI",
2341 .irq_unmask = intcapxt_unmask_irq,
2342 .irq_mask = intcapxt_mask_irq,
2343 .irq_ack = irq_chip_ack_parent,
2344 .irq_retrigger = irq_chip_retrigger_hierarchy,
2345 .irq_set_affinity = intcapxt_set_affinity,
2346 .irq_set_wake = intcapxt_set_wake,
2347 .flags = IRQCHIP_MASK_ON_SUSPEND,
2350 static const struct irq_domain_ops intcapxt_domain_ops = {
2351 .alloc = intcapxt_irqdomain_alloc,
2352 .free = intcapxt_irqdomain_free,
2353 .activate = intcapxt_irqdomain_activate,
2354 .deactivate = intcapxt_irqdomain_deactivate,
2358 static struct irq_domain *iommu_irqdomain;
2360 static struct irq_domain *iommu_get_irqdomain(void)
2362 struct fwnode_handle *fn;
2364 /* No need for locking here (yet) as the init is single-threaded */
2365 if (iommu_irqdomain)
2366 return iommu_irqdomain;
2368 fn = irq_domain_alloc_named_fwnode("AMD-Vi-MSI");
2372 iommu_irqdomain = irq_domain_create_hierarchy(x86_vector_domain, 0, 0,
2373 fn, &intcapxt_domain_ops,
2375 if (!iommu_irqdomain)
2376 irq_domain_free_fwnode(fn);
2378 return iommu_irqdomain;
2381 static int iommu_setup_intcapxt(struct amd_iommu *iommu)
2383 struct irq_domain *domain;
2384 struct irq_alloc_info info;
2387 domain = iommu_get_irqdomain();
2391 init_irq_alloc_info(&info, NULL);
2392 info.type = X86_IRQ_ALLOC_TYPE_AMDVI;
2395 irq = irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, &info);
2397 irq_domain_remove(domain);
2401 ret = request_threaded_irq(irq, amd_iommu_int_handler,
2402 amd_iommu_int_thread, 0, "AMD-Vi", iommu);
2404 irq_domain_free_irqs(irq, 1);
2405 irq_domain_remove(domain);
2412 static int iommu_init_irq(struct amd_iommu *iommu)
2416 if (iommu->int_enabled)
2419 if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
2420 ret = iommu_setup_intcapxt(iommu);
2421 else if (iommu->dev->msi_cap)
2422 ret = iommu_setup_msi(iommu);
2429 iommu->int_enabled = true;
2432 if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
2433 iommu_feature_enable(iommu, CONTROL_INTCAPXT_EN);
2435 iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
2437 if (iommu->ppr_log != NULL)
2438 iommu_feature_enable(iommu, CONTROL_PPRINT_EN);
2442 /****************************************************************************
2444 * The next functions belong to the third pass of parsing the ACPI
2445 * table. In this last pass the memory mapping requirements are
2446 * gathered (like exclusion and unity mapping ranges).
2448 ****************************************************************************/
2450 static void __init free_unity_maps(void)
2452 struct unity_map_entry *entry, *next;
2453 struct amd_iommu_pci_seg *p, *pci_seg;
2455 for_each_pci_segment_safe(pci_seg, p) {
2456 list_for_each_entry_safe(entry, next, &pci_seg->unity_map, list) {
2457 list_del(&entry->list);
2463 /* called for unity map ACPI definition */
2464 static int __init init_unity_map_range(struct ivmd_header *m,
2465 struct acpi_table_header *ivrs_base)
2467 struct unity_map_entry *e = NULL;
2468 struct amd_iommu_pci_seg *pci_seg;
2471 pci_seg = get_pci_segment(m->pci_seg, ivrs_base);
2472 if (pci_seg == NULL)
2475 e = kzalloc(sizeof(*e), GFP_KERNEL);
2483 case ACPI_IVMD_TYPE:
2484 s = "IVMD_TYPEi\t\t\t";
2485 e->devid_start = e->devid_end = m->devid;
2487 case ACPI_IVMD_TYPE_ALL:
2488 s = "IVMD_TYPE_ALL\t\t";
2490 e->devid_end = pci_seg->last_bdf;
2492 case ACPI_IVMD_TYPE_RANGE:
2493 s = "IVMD_TYPE_RANGE\t\t";
2494 e->devid_start = m->devid;
2495 e->devid_end = m->aux;
2498 e->address_start = PAGE_ALIGN(m->range_start);
2499 e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
2500 e->prot = m->flags >> 1;
2503 * Treat per-device exclusion ranges as r/w unity-mapped regions
2504 * since some buggy BIOSes might lead to the overwritten exclusion
2505 * range (exclusion_start and exclusion_length members). This
2506 * happens when there are multiple exclusion ranges (IVMD entries)
2507 * defined in ACPI table.
2509 if (m->flags & IVMD_FLAG_EXCL_RANGE)
2510 e->prot = (IVMD_FLAG_IW | IVMD_FLAG_IR) >> 1;
2512 DUMP_printk("%s devid_start: %04x:%02x:%02x.%x devid_end: "
2513 "%04x:%02x:%02x.%x range_start: %016llx range_end: %016llx"
2514 " flags: %x\n", s, m->pci_seg,
2515 PCI_BUS_NUM(e->devid_start), PCI_SLOT(e->devid_start),
2516 PCI_FUNC(e->devid_start), m->pci_seg,
2517 PCI_BUS_NUM(e->devid_end),
2518 PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end),
2519 e->address_start, e->address_end, m->flags);
2521 list_add_tail(&e->list, &pci_seg->unity_map);
2526 /* iterates over all memory definitions we find in the ACPI table */
2527 static int __init init_memory_definitions(struct acpi_table_header *table)
2529 u8 *p = (u8 *)table, *end = (u8 *)table;
2530 struct ivmd_header *m;
2532 end += table->length;
2533 p += IVRS_HEADER_LENGTH;
2536 m = (struct ivmd_header *)p;
2537 if (m->flags & (IVMD_FLAG_UNITY_MAP | IVMD_FLAG_EXCL_RANGE))
2538 init_unity_map_range(m, table);
2547 * Init the device table to not allow DMA access for devices
2549 static void init_device_table_dma(struct amd_iommu_pci_seg *pci_seg)
2552 struct dev_table_entry *dev_table = pci_seg->dev_table;
2554 if (dev_table == NULL)
2557 for (devid = 0; devid <= pci_seg->last_bdf; ++devid) {
2558 __set_dev_entry_bit(dev_table, devid, DEV_ENTRY_VALID);
2559 if (!amd_iommu_snp_en)
2560 __set_dev_entry_bit(dev_table, devid, DEV_ENTRY_TRANSLATION);
2564 static void __init uninit_device_table_dma(struct amd_iommu_pci_seg *pci_seg)
2567 struct dev_table_entry *dev_table = pci_seg->dev_table;
2569 if (dev_table == NULL)
2572 for (devid = 0; devid <= pci_seg->last_bdf; ++devid) {
2573 dev_table[devid].data[0] = 0ULL;
2574 dev_table[devid].data[1] = 0ULL;
2578 static void init_device_table(void)
2580 struct amd_iommu_pci_seg *pci_seg;
2583 if (!amd_iommu_irq_remap)
2586 for_each_pci_segment(pci_seg) {
2587 for (devid = 0; devid <= pci_seg->last_bdf; ++devid)
2588 __set_dev_entry_bit(pci_seg->dev_table,
2589 devid, DEV_ENTRY_IRQ_TBL_EN);
2593 static void iommu_init_flags(struct amd_iommu *iommu)
2595 iommu->acpi_flags & IVHD_FLAG_HT_TUN_EN_MASK ?
2596 iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
2597 iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
2599 iommu->acpi_flags & IVHD_FLAG_PASSPW_EN_MASK ?
2600 iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
2601 iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
2603 iommu->acpi_flags & IVHD_FLAG_RESPASSPW_EN_MASK ?
2604 iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
2605 iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
2607 iommu->acpi_flags & IVHD_FLAG_ISOC_EN_MASK ?
2608 iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
2609 iommu_feature_disable(iommu, CONTROL_ISOC_EN);
2612 * make IOMMU memory accesses cache coherent
2614 iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
2616 /* Set IOTLB invalidation timeout to 1s */
2617 iommu_set_inv_tlb_timeout(iommu, CTRL_INV_TO_1S);
2620 static void iommu_apply_resume_quirks(struct amd_iommu *iommu)
2623 u32 ioc_feature_control;
2624 struct pci_dev *pdev = iommu->root_pdev;
2626 /* RD890 BIOSes may not have completely reconfigured the iommu */
2627 if (!is_rd890_iommu(iommu->dev) || !pdev)
2631 * First, we need to ensure that the iommu is enabled. This is
2632 * controlled by a register in the northbridge
2635 /* Select Northbridge indirect register 0x75 and enable writing */
2636 pci_write_config_dword(pdev, 0x60, 0x75 | (1 << 7));
2637 pci_read_config_dword(pdev, 0x64, &ioc_feature_control);
2639 /* Enable the iommu */
2640 if (!(ioc_feature_control & 0x1))
2641 pci_write_config_dword(pdev, 0x64, ioc_feature_control | 1);
2643 /* Restore the iommu BAR */
2644 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
2645 iommu->stored_addr_lo);
2646 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 8,
2647 iommu->stored_addr_hi);
2649 /* Restore the l1 indirect regs for each of the 6 l1s */
2650 for (i = 0; i < 6; i++)
2651 for (j = 0; j < 0x12; j++)
2652 iommu_write_l1(iommu, i, j, iommu->stored_l1[i][j]);
2654 /* Restore the l2 indirect regs */
2655 for (i = 0; i < 0x83; i++)
2656 iommu_write_l2(iommu, i, iommu->stored_l2[i]);
2658 /* Lock PCI setup registers */
2659 pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
2660 iommu->stored_addr_lo | 1);
2663 static void iommu_enable_ga(struct amd_iommu *iommu)
2665 #ifdef CONFIG_IRQ_REMAP
2666 switch (amd_iommu_guest_ir) {
2667 case AMD_IOMMU_GUEST_IR_VAPIC:
2668 case AMD_IOMMU_GUEST_IR_LEGACY_GA:
2669 iommu_feature_enable(iommu, CONTROL_GA_EN);
2670 iommu->irte_ops = &irte_128_ops;
2673 iommu->irte_ops = &irte_32_ops;
2679 static void early_enable_iommu(struct amd_iommu *iommu)
2681 iommu_disable(iommu);
2682 iommu_init_flags(iommu);
2683 iommu_set_device_table(iommu);
2684 iommu_enable_command_buffer(iommu);
2685 iommu_enable_event_buffer(iommu);
2686 iommu_set_exclusion_range(iommu);
2687 iommu_enable_ga(iommu);
2688 iommu_enable_xt(iommu);
2689 iommu_enable(iommu);
2690 iommu_flush_all_caches(iommu);
2694 * This function finally enables all IOMMUs found in the system after
2695 * they have been initialized.
2697 * Or if in kdump kernel and IOMMUs are all pre-enabled, try to copy
2698 * the old content of device table entries. Not this case or copy failed,
2699 * just continue as normal kernel does.
2701 static void early_enable_iommus(void)
2703 struct amd_iommu *iommu;
2704 struct amd_iommu_pci_seg *pci_seg;
2706 if (!copy_device_table()) {
2708 * If come here because of failure in copying device table from old
2709 * kernel with all IOMMUs enabled, print error message and try to
2710 * free allocated old_dev_tbl_cpy.
2712 if (amd_iommu_pre_enabled)
2713 pr_err("Failed to copy DEV table from previous kernel.\n");
2715 for_each_pci_segment(pci_seg) {
2716 if (pci_seg->old_dev_tbl_cpy != NULL) {
2717 free_pages((unsigned long)pci_seg->old_dev_tbl_cpy,
2718 get_order(pci_seg->dev_table_size));
2719 pci_seg->old_dev_tbl_cpy = NULL;
2723 for_each_iommu(iommu) {
2724 clear_translation_pre_enabled(iommu);
2725 early_enable_iommu(iommu);
2728 pr_info("Copied DEV table from previous kernel.\n");
2730 for_each_pci_segment(pci_seg) {
2731 free_pages((unsigned long)pci_seg->dev_table,
2732 get_order(pci_seg->dev_table_size));
2733 pci_seg->dev_table = pci_seg->old_dev_tbl_cpy;
2736 for_each_iommu(iommu) {
2737 iommu_disable_command_buffer(iommu);
2738 iommu_disable_event_buffer(iommu);
2739 iommu_enable_command_buffer(iommu);
2740 iommu_enable_event_buffer(iommu);
2741 iommu_enable_ga(iommu);
2742 iommu_enable_xt(iommu);
2743 iommu_set_device_table(iommu);
2744 iommu_flush_all_caches(iommu);
2749 static void enable_iommus_v2(void)
2751 struct amd_iommu *iommu;
2753 for_each_iommu(iommu) {
2754 iommu_enable_ppr_log(iommu);
2755 iommu_enable_gt(iommu);
2759 static void enable_iommus_vapic(void)
2761 #ifdef CONFIG_IRQ_REMAP
2763 struct amd_iommu *iommu;
2765 for_each_iommu(iommu) {
2767 * Disable GALog if already running. It could have been enabled
2768 * in the previous boot before kdump.
2770 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
2771 if (!(status & MMIO_STATUS_GALOG_RUN_MASK))
2774 iommu_feature_disable(iommu, CONTROL_GALOG_EN);
2775 iommu_feature_disable(iommu, CONTROL_GAINT_EN);
2778 * Need to set and poll check the GALOGRun bit to zero before
2779 * we can set/ modify GA Log registers safely.
2781 for (i = 0; i < LOOP_TIMEOUT; ++i) {
2782 status = readl(iommu->mmio_base + MMIO_STATUS_OFFSET);
2783 if (!(status & MMIO_STATUS_GALOG_RUN_MASK))
2788 if (WARN_ON(i >= LOOP_TIMEOUT))
2792 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir) &&
2793 !check_feature_on_all_iommus(FEATURE_GAM_VAPIC)) {
2794 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;
2798 if (amd_iommu_snp_en &&
2799 !FEATURE_SNPAVICSUP_GAM(amd_iommu_efr2)) {
2800 pr_warn("Force to disable Virtual APIC due to SNP\n");
2801 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;
2805 /* Enabling GAM and SNPAVIC support */
2806 for_each_iommu(iommu) {
2807 if (iommu_init_ga_log(iommu) ||
2808 iommu_ga_log_enable(iommu))
2811 iommu_feature_enable(iommu, CONTROL_GAM_EN);
2812 if (amd_iommu_snp_en)
2813 iommu_feature_enable(iommu, CONTROL_SNPAVIC_EN);
2816 amd_iommu_irq_ops.capability |= (1 << IRQ_POSTING_CAP);
2817 pr_info("Virtual APIC enabled\n");
2821 static void enable_iommus(void)
2823 early_enable_iommus();
2824 enable_iommus_vapic();
2828 static void disable_iommus(void)
2830 struct amd_iommu *iommu;
2832 for_each_iommu(iommu)
2833 iommu_disable(iommu);
2835 #ifdef CONFIG_IRQ_REMAP
2836 if (AMD_IOMMU_GUEST_IR_VAPIC(amd_iommu_guest_ir))
2837 amd_iommu_irq_ops.capability &= ~(1 << IRQ_POSTING_CAP);
2842 * Suspend/Resume support
2843 * disable suspend until real resume implemented
2846 static void amd_iommu_resume(void)
2848 struct amd_iommu *iommu;
2850 for_each_iommu(iommu)
2851 iommu_apply_resume_quirks(iommu);
2853 /* re-load the hardware */
2856 amd_iommu_enable_interrupts();
2859 static int amd_iommu_suspend(void)
2861 /* disable IOMMUs to go out of the way for BIOS */
2867 static struct syscore_ops amd_iommu_syscore_ops = {
2868 .suspend = amd_iommu_suspend,
2869 .resume = amd_iommu_resume,
2872 static void __init free_iommu_resources(void)
2874 kmem_cache_destroy(amd_iommu_irq_cache);
2875 amd_iommu_irq_cache = NULL;
2878 free_pci_segments();
2881 /* SB IOAPIC is always on this device in AMD systems */
2882 #define IOAPIC_SB_DEVID ((0x00 << 8) | PCI_DEVFN(0x14, 0))
2884 static bool __init check_ioapic_information(void)
2886 const char *fw_bug = FW_BUG;
2887 bool ret, has_sb_ioapic;
2890 has_sb_ioapic = false;
2894 * If we have map overrides on the kernel command line the
2895 * messages in this function might not describe firmware bugs
2896 * anymore - so be careful
2901 for (idx = 0; idx < nr_ioapics; idx++) {
2902 int devid, id = mpc_ioapic_id(idx);
2904 devid = get_ioapic_devid(id);
2906 pr_err("%s: IOAPIC[%d] not in IVRS table\n",
2909 } else if (devid == IOAPIC_SB_DEVID) {
2910 has_sb_ioapic = true;
2915 if (!has_sb_ioapic) {
2917 * We expect the SB IOAPIC to be listed in the IVRS
2918 * table. The system timer is connected to the SB IOAPIC
2919 * and if we don't have it in the list the system will
2920 * panic at boot time. This situation usually happens
2921 * when the BIOS is buggy and provides us the wrong
2922 * device id for the IOAPIC in the system.
2924 pr_err("%s: No southbridge IOAPIC found\n", fw_bug);
2928 pr_err("Disabling interrupt remapping\n");
2933 static void __init free_dma_resources(void)
2935 free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
2936 get_order(MAX_DOMAIN_ID/8));
2937 amd_iommu_pd_alloc_bitmap = NULL;
2942 static void __init ivinfo_init(void *ivrs)
2944 amd_iommu_ivinfo = *((u32 *)(ivrs + IOMMU_IVINFO_OFFSET));
2948 * This is the hardware init function for AMD IOMMU in the system.
2949 * This function is called either from amd_iommu_init or from the interrupt
2950 * remapping setup code.
2952 * This function basically parses the ACPI table for AMD IOMMU (IVRS)
2955 * 1 pass) Discover the most comprehensive IVHD type to use.
2957 * 2 pass) Find the highest PCI device id the driver has to handle.
2958 * Upon this information the size of the data structures is
2959 * determined that needs to be allocated.
2961 * 3 pass) Initialize the data structures just allocated with the
2962 * information in the ACPI table about available AMD IOMMUs
2963 * in the system. It also maps the PCI devices in the
2964 * system to specific IOMMUs
2966 * 4 pass) After the basic data structures are allocated and
2967 * initialized we update them with information about memory
2968 * remapping requirements parsed out of the ACPI table in
2971 * After everything is set up the IOMMUs are enabled and the necessary
2972 * hotplug and suspend notifiers are registered.
2974 static int __init early_amd_iommu_init(void)
2976 struct acpi_table_header *ivrs_base;
2977 int remap_cache_sz, ret;
2980 if (!amd_iommu_detected)
2983 status = acpi_get_table("IVRS", 0, &ivrs_base);
2984 if (status == AE_NOT_FOUND)
2986 else if (ACPI_FAILURE(status)) {
2987 const char *err = acpi_format_exception(status);
2988 pr_err("IVRS table error: %s\n", err);
2993 * Validate checksum here so we don't need to do it when
2994 * we actually parse the table
2996 ret = check_ivrs_checksum(ivrs_base);
3000 ivinfo_init(ivrs_base);
3002 amd_iommu_target_ivhd_type = get_highest_supported_ivhd_type(ivrs_base);
3003 DUMP_printk("Using IVHD type %#x\n", amd_iommu_target_ivhd_type);
3005 /* Device table - directly used by all IOMMUs */
3008 amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(
3009 GFP_KERNEL | __GFP_ZERO,
3010 get_order(MAX_DOMAIN_ID/8));
3011 if (amd_iommu_pd_alloc_bitmap == NULL)
3015 * never allocate domain 0 because its used as the non-allocated and
3016 * error value placeholder
3018 __set_bit(0, amd_iommu_pd_alloc_bitmap);
3021 * now the data structures are allocated and basically initialized
3022 * start the real acpi table scan
3024 ret = init_iommu_all(ivrs_base);
3028 /* Disable any previously enabled IOMMUs */
3029 if (!is_kdump_kernel() || amd_iommu_disabled)
3032 if (amd_iommu_irq_remap)
3033 amd_iommu_irq_remap = check_ioapic_information();
3035 if (amd_iommu_irq_remap) {
3036 struct amd_iommu_pci_seg *pci_seg;
3038 * Interrupt remapping enabled, create kmem_cache for the
3042 if (!AMD_IOMMU_GUEST_IR_GA(amd_iommu_guest_ir))
3043 remap_cache_sz = MAX_IRQS_PER_TABLE * sizeof(u32);
3045 remap_cache_sz = MAX_IRQS_PER_TABLE * (sizeof(u64) * 2);
3046 amd_iommu_irq_cache = kmem_cache_create("irq_remap_cache",
3048 DTE_INTTAB_ALIGNMENT,
3050 if (!amd_iommu_irq_cache)
3053 for_each_pci_segment(pci_seg) {
3054 if (alloc_irq_lookup_table(pci_seg))
3059 ret = init_memory_definitions(ivrs_base);
3063 /* init the device table */
3064 init_device_table();
3067 /* Don't leak any ACPI memory */
3068 acpi_put_table(ivrs_base);
3073 static int amd_iommu_enable_interrupts(void)
3075 struct amd_iommu *iommu;
3078 for_each_iommu(iommu) {
3079 ret = iommu_init_irq(iommu);
3088 static bool __init detect_ivrs(void)
3090 struct acpi_table_header *ivrs_base;
3094 status = acpi_get_table("IVRS", 0, &ivrs_base);
3095 if (status == AE_NOT_FOUND)
3097 else if (ACPI_FAILURE(status)) {
3098 const char *err = acpi_format_exception(status);
3099 pr_err("IVRS table error: %s\n", err);
3103 acpi_put_table(ivrs_base);
3105 if (amd_iommu_force_enable)
3108 /* Don't use IOMMU if there is Stoney Ridge graphics */
3109 for (i = 0; i < 32; i++) {
3112 pci_id = read_pci_config(0, i, 0, 0);
3113 if ((pci_id & 0xffff) == 0x1002 && (pci_id >> 16) == 0x98e4) {
3114 pr_info("Disable IOMMU on Stoney Ridge\n");
3120 /* Make sure ACS will be enabled during PCI probe */
3126 /****************************************************************************
3128 * AMD IOMMU Initialization State Machine
3130 ****************************************************************************/
3132 static int __init state_next(void)
3136 switch (init_state) {
3137 case IOMMU_START_STATE:
3138 if (!detect_ivrs()) {
3139 init_state = IOMMU_NOT_FOUND;
3142 init_state = IOMMU_IVRS_DETECTED;
3145 case IOMMU_IVRS_DETECTED:
3146 if (amd_iommu_disabled) {
3147 init_state = IOMMU_CMDLINE_DISABLED;
3150 ret = early_amd_iommu_init();
3151 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_ACPI_FINISHED;
3154 case IOMMU_ACPI_FINISHED:
3155 early_enable_iommus();
3156 x86_platform.iommu_shutdown = disable_iommus;
3157 init_state = IOMMU_ENABLED;
3160 register_syscore_ops(&amd_iommu_syscore_ops);
3161 ret = amd_iommu_init_pci();
3162 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_PCI_INIT;
3163 enable_iommus_vapic();
3166 case IOMMU_PCI_INIT:
3167 ret = amd_iommu_enable_interrupts();
3168 init_state = ret ? IOMMU_INIT_ERROR : IOMMU_INTERRUPTS_EN;
3170 case IOMMU_INTERRUPTS_EN:
3171 init_state = IOMMU_INITIALIZED;
3173 case IOMMU_INITIALIZED:
3176 case IOMMU_NOT_FOUND:
3177 case IOMMU_INIT_ERROR:
3178 case IOMMU_CMDLINE_DISABLED:
3179 /* Error states => do nothing */
3188 free_dma_resources();
3189 if (!irq_remapping_enabled) {
3191 free_iommu_resources();
3193 struct amd_iommu *iommu;
3194 struct amd_iommu_pci_seg *pci_seg;
3196 for_each_pci_segment(pci_seg)
3197 uninit_device_table_dma(pci_seg);
3199 for_each_iommu(iommu)
3200 iommu_flush_all_caches(iommu);
3206 static int __init iommu_go_to_state(enum iommu_init_state state)
3210 while (init_state != state) {
3211 if (init_state == IOMMU_NOT_FOUND ||
3212 init_state == IOMMU_INIT_ERROR ||
3213 init_state == IOMMU_CMDLINE_DISABLED)
3221 #ifdef CONFIG_IRQ_REMAP
3222 int __init amd_iommu_prepare(void)
3226 amd_iommu_irq_remap = true;
3228 ret = iommu_go_to_state(IOMMU_ACPI_FINISHED);
3230 amd_iommu_irq_remap = false;
3234 return amd_iommu_irq_remap ? 0 : -ENODEV;
3237 int __init amd_iommu_enable(void)
3241 ret = iommu_go_to_state(IOMMU_ENABLED);
3245 irq_remapping_enabled = 1;
3246 return amd_iommu_xt_mode;
3249 void amd_iommu_disable(void)
3251 amd_iommu_suspend();
3254 int amd_iommu_reenable(int mode)
3261 int __init amd_iommu_enable_faulting(void)
3263 /* We enable MSI later when PCI is initialized */
3269 * This is the core init function for AMD IOMMU hardware in the system.
3270 * This function is called from the generic x86 DMA layer initialization
3273 static int __init amd_iommu_init(void)
3275 struct amd_iommu *iommu;
3278 ret = iommu_go_to_state(IOMMU_INITIALIZED);
3279 #ifdef CONFIG_GART_IOMMU
3280 if (ret && list_empty(&amd_iommu_list)) {
3282 * We failed to initialize the AMD IOMMU - try fallback
3283 * to GART if possible.
3289 for_each_iommu(iommu)
3290 amd_iommu_debugfs_setup(iommu);
3295 static bool amd_iommu_sme_check(void)
3297 if (!cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT) ||
3298 (boot_cpu_data.x86 != 0x17))
3301 /* For Fam17h, a specific level of support is required */
3302 if (boot_cpu_data.microcode >= 0x08001205)
3305 if ((boot_cpu_data.microcode >= 0x08001126) &&
3306 (boot_cpu_data.microcode <= 0x080011ff))
3309 pr_notice("IOMMU not currently supported when SME is active\n");
3314 /****************************************************************************
3316 * Early detect code. This code runs at IOMMU detection time in the DMA
3317 * layer. It just looks if there is an IVRS ACPI table to detect AMD
3320 ****************************************************************************/
3321 int __init amd_iommu_detect(void)
3325 if (no_iommu || (iommu_detected && !gart_iommu_aperture))
3328 if (!amd_iommu_sme_check())
3331 ret = iommu_go_to_state(IOMMU_IVRS_DETECTED);
3335 amd_iommu_detected = true;
3337 x86_init.iommu.iommu_init = amd_iommu_init;
3342 /****************************************************************************
3344 * Parsing functions for the AMD IOMMU specific kernel command line
3347 ****************************************************************************/
3349 static int __init parse_amd_iommu_dump(char *str)
3351 amd_iommu_dump = true;
3356 static int __init parse_amd_iommu_intr(char *str)
3358 for (; *str; ++str) {
3359 if (strncmp(str, "legacy", 6) == 0) {
3360 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_LEGACY_GA;
3363 if (strncmp(str, "vapic", 5) == 0) {
3364 amd_iommu_guest_ir = AMD_IOMMU_GUEST_IR_VAPIC;
3371 static int __init parse_amd_iommu_options(char *str)
3377 if (strncmp(str, "fullflush", 9) == 0) {
3378 pr_warn("amd_iommu=fullflush deprecated; use iommu.strict=1 instead\n");
3379 iommu_set_dma_strict();
3380 } else if (strncmp(str, "force_enable", 12) == 0) {
3381 amd_iommu_force_enable = true;
3382 } else if (strncmp(str, "off", 3) == 0) {
3383 amd_iommu_disabled = true;
3384 } else if (strncmp(str, "force_isolation", 15) == 0) {
3385 amd_iommu_force_isolation = true;
3386 } else if (strncmp(str, "pgtbl_v1", 8) == 0) {
3387 amd_iommu_pgtable = AMD_IOMMU_V1;
3388 } else if (strncmp(str, "pgtbl_v2", 8) == 0) {
3389 amd_iommu_pgtable = AMD_IOMMU_V2;
3391 pr_notice("Unknown option - '%s'\n", str);
3394 str += strcspn(str, ",");
3402 static int __init parse_ivrs_ioapic(char *str)
3404 u32 seg = 0, bus, dev, fn;
3408 ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);
3410 ret = sscanf(str, "[%d]=%x:%x:%x.%x", &id, &seg, &bus, &dev, &fn);
3412 pr_err("Invalid command line: ivrs_ioapic%s\n", str);
3417 if (early_ioapic_map_size == EARLY_MAP_SIZE) {
3418 pr_err("Early IOAPIC map overflow - ignoring ivrs_ioapic%s\n",
3423 devid = IVRS_GET_SBDF_ID(seg, bus, dev, fn);
3425 cmdline_maps = true;
3426 i = early_ioapic_map_size++;
3427 early_ioapic_map[i].id = id;
3428 early_ioapic_map[i].devid = devid;
3429 early_ioapic_map[i].cmd_line = true;
3434 static int __init parse_ivrs_hpet(char *str)
3436 u32 seg = 0, bus, dev, fn;
3440 ret = sscanf(str, "[%d]=%x:%x.%x", &id, &bus, &dev, &fn);
3442 ret = sscanf(str, "[%d]=%x:%x:%x.%x", &id, &seg, &bus, &dev, &fn);
3444 pr_err("Invalid command line: ivrs_hpet%s\n", str);
3449 if (early_hpet_map_size == EARLY_MAP_SIZE) {
3450 pr_err("Early HPET map overflow - ignoring ivrs_hpet%s\n",
3455 devid = IVRS_GET_SBDF_ID(seg, bus, dev, fn);
3457 cmdline_maps = true;
3458 i = early_hpet_map_size++;
3459 early_hpet_map[i].id = id;
3460 early_hpet_map[i].devid = devid;
3461 early_hpet_map[i].cmd_line = true;
3466 static int __init parse_ivrs_acpihid(char *str)
3468 u32 seg = 0, bus, dev, fn;
3469 char *hid, *uid, *p;
3470 char acpiid[ACPIHID_UID_LEN + ACPIHID_HID_LEN] = {0};
3473 ret = sscanf(str, "[%x:%x.%x]=%s", &bus, &dev, &fn, acpiid);
3475 ret = sscanf(str, "[%x:%x:%x.%x]=%s", &seg, &bus, &dev, &fn, acpiid);
3477 pr_err("Invalid command line: ivrs_acpihid(%s)\n", str);
3483 hid = strsep(&p, ":");
3486 if (!hid || !(*hid) || !uid) {
3487 pr_err("Invalid command line: hid or uid\n");
3491 i = early_acpihid_map_size++;
3492 memcpy(early_acpihid_map[i].hid, hid, strlen(hid));
3493 memcpy(early_acpihid_map[i].uid, uid, strlen(uid));
3494 early_acpihid_map[i].devid = IVRS_GET_SBDF_ID(seg, bus, dev, fn);
3495 early_acpihid_map[i].cmd_line = true;
3500 __setup("amd_iommu_dump", parse_amd_iommu_dump);
3501 __setup("amd_iommu=", parse_amd_iommu_options);
3502 __setup("amd_iommu_intr=", parse_amd_iommu_intr);
3503 __setup("ivrs_ioapic", parse_ivrs_ioapic);
3504 __setup("ivrs_hpet", parse_ivrs_hpet);
3505 __setup("ivrs_acpihid", parse_ivrs_acpihid);
3507 bool amd_iommu_v2_supported(void)
3510 * Since DTE[Mode]=0 is prohibited on SNP-enabled system
3511 * (i.e. EFR[SNPSup]=1), IOMMUv2 page table cannot be used without
3512 * setting up IOMMUv1 page table.
3514 return amd_iommu_v2_present && !amd_iommu_snp_en;
3516 EXPORT_SYMBOL(amd_iommu_v2_supported);
3518 struct amd_iommu *get_amd_iommu(unsigned int idx)
3521 struct amd_iommu *iommu;
3523 for_each_iommu(iommu)
3529 /****************************************************************************
3531 * IOMMU EFR Performance Counter support functionality. This code allows
3532 * access to the IOMMU PC functionality.
3534 ****************************************************************************/
3536 u8 amd_iommu_pc_get_max_banks(unsigned int idx)
3538 struct amd_iommu *iommu = get_amd_iommu(idx);
3541 return iommu->max_banks;
3545 EXPORT_SYMBOL(amd_iommu_pc_get_max_banks);
3547 bool amd_iommu_pc_supported(void)
3549 return amd_iommu_pc_present;
3551 EXPORT_SYMBOL(amd_iommu_pc_supported);
3553 u8 amd_iommu_pc_get_max_counters(unsigned int idx)
3555 struct amd_iommu *iommu = get_amd_iommu(idx);
3558 return iommu->max_counters;
3562 EXPORT_SYMBOL(amd_iommu_pc_get_max_counters);
3564 static int iommu_pc_get_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr,
3565 u8 fxn, u64 *value, bool is_write)
3570 /* Make sure the IOMMU PC resource is available */
3571 if (!amd_iommu_pc_present)
3574 /* Check for valid iommu and pc register indexing */
3575 if (WARN_ON(!iommu || (fxn > 0x28) || (fxn & 7)))
3578 offset = (u32)(((0x40 | bank) << 12) | (cntr << 8) | fxn);
3580 /* Limit the offset to the hw defined mmio region aperture */
3581 max_offset_lim = (u32)(((0x40 | iommu->max_banks) << 12) |
3582 (iommu->max_counters << 8) | 0x28);
3583 if ((offset < MMIO_CNTR_REG_OFFSET) ||
3584 (offset > max_offset_lim))
3588 u64 val = *value & GENMASK_ULL(47, 0);
3590 writel((u32)val, iommu->mmio_base + offset);
3591 writel((val >> 32), iommu->mmio_base + offset + 4);
3593 *value = readl(iommu->mmio_base + offset + 4);
3595 *value |= readl(iommu->mmio_base + offset);
3596 *value &= GENMASK_ULL(47, 0);
3602 int amd_iommu_pc_get_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value)
3607 return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, false);
3610 int amd_iommu_pc_set_reg(struct amd_iommu *iommu, u8 bank, u8 cntr, u8 fxn, u64 *value)
3615 return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, true);
3618 #ifdef CONFIG_AMD_MEM_ENCRYPT
3619 int amd_iommu_snp_enable(void)
3622 * The SNP support requires that IOMMU must be enabled, and is
3623 * not configured in the passthrough mode.
3625 if (no_iommu || iommu_default_passthrough()) {
3626 pr_err("SNP: IOMMU is disabled or configured in passthrough mode, SNP cannot be supported");
3631 * Prevent enabling SNP after IOMMU_ENABLED state because this process
3632 * affect how IOMMU driver sets up data structures and configures
3635 if (init_state > IOMMU_ENABLED) {
3636 pr_err("SNP: Too late to enable SNP for IOMMU.\n");
3640 amd_iommu_snp_en = check_feature_on_all_iommus(FEATURE_SNP);
3641 if (!amd_iommu_snp_en)
3644 pr_info("SNP enabled\n");
3646 /* Enforce IOMMU v1 pagetable when SNP is enabled. */
3647 if (amd_iommu_pgtable != AMD_IOMMU_V1) {
3648 pr_warn("Force to using AMD IOMMU v1 page table due to SNP\n");
3649 amd_iommu_pgtable = AMD_IOMMU_V1;