2 * Copyright (C) 2007-2008 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/gfp.h>
23 #include <linux/list.h>
24 #include <linux/sysdev.h>
25 #include <linux/interrupt.h>
26 #include <linux/msi.h>
27 #include <asm/pci-direct.h>
28 #include <asm/amd_iommu_types.h>
29 #include <asm/amd_iommu.h>
30 #include <asm/iommu.h>
33 * definitions for the ACPI scanning code
35 #define IVRS_HEADER_LENGTH 48
37 #define ACPI_IVHD_TYPE 0x10
38 #define ACPI_IVMD_TYPE_ALL 0x20
39 #define ACPI_IVMD_TYPE 0x21
40 #define ACPI_IVMD_TYPE_RANGE 0x22
42 #define IVHD_DEV_ALL 0x01
43 #define IVHD_DEV_SELECT 0x02
44 #define IVHD_DEV_SELECT_RANGE_START 0x03
45 #define IVHD_DEV_RANGE_END 0x04
46 #define IVHD_DEV_ALIAS 0x42
47 #define IVHD_DEV_ALIAS_RANGE 0x43
48 #define IVHD_DEV_EXT_SELECT 0x46
49 #define IVHD_DEV_EXT_SELECT_RANGE 0x47
51 #define IVHD_FLAG_HT_TUN_EN 0x00
52 #define IVHD_FLAG_PASSPW_EN 0x01
53 #define IVHD_FLAG_RESPASSPW_EN 0x02
54 #define IVHD_FLAG_ISOC_EN 0x03
56 #define IVMD_FLAG_EXCL_RANGE 0x08
57 #define IVMD_FLAG_UNITY_MAP 0x01
59 #define ACPI_DEVFLAG_INITPASS 0x01
60 #define ACPI_DEVFLAG_EXTINT 0x02
61 #define ACPI_DEVFLAG_NMI 0x04
62 #define ACPI_DEVFLAG_SYSMGT1 0x10
63 #define ACPI_DEVFLAG_SYSMGT2 0x20
64 #define ACPI_DEVFLAG_LINT0 0x40
65 #define ACPI_DEVFLAG_LINT1 0x80
66 #define ACPI_DEVFLAG_ATSDIS 0x10000000
69 * ACPI table definitions
71 * These data structures are laid over the table to parse the important values
76 * structure describing one IOMMU in the ACPI table. Typically followed by one
77 * or more ivhd_entrys.
89 } __attribute__((packed));
92 * A device entry describing which devices a specific IOMMU translates and
93 * which requestor ids they use.
100 } __attribute__((packed));
103 * An AMD IOMMU memory definition structure. It defines things like exclusion
104 * ranges for devices and regions that should be unity mapped.
115 } __attribute__((packed));
117 static int __initdata amd_iommu_detected;
119 u16 amd_iommu_last_bdf; /* largest PCI device id we have
121 LIST_HEAD(amd_iommu_unity_map); /* a list of required unity mappings
123 unsigned amd_iommu_aperture_order = 26; /* size of aperture in power of 2 */
124 int amd_iommu_isolate; /* if 1, device isolation is enabled */
126 LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the
130 * Pointer to the device table which is shared by all AMD IOMMUs
131 * it is indexed by the PCI device id or the HT unit id and contains
132 * information about the domain the device belongs to as well as the
133 * page table root pointer.
135 struct dev_table_entry *amd_iommu_dev_table;
138 * The alias table is a driver specific data structure which contains the
139 * mappings of the PCI device ids to the actual requestor ids on the IOMMU.
140 * More than one device can share the same requestor id.
142 u16 *amd_iommu_alias_table;
145 * The rlookup table is used to find the IOMMU which is responsible
146 * for a specific device. It is also indexed by the PCI device id.
148 struct amd_iommu **amd_iommu_rlookup_table;
151 * The pd table (protection domain table) is used to find the protection domain
152 * data structure a device belongs to. Indexed with the PCI device id too.
154 struct protection_domain **amd_iommu_pd_table;
157 * AMD IOMMU allows up to 2^16 differend protection domains. This is a bitmap
158 * to know which ones are already in use.
160 unsigned long *amd_iommu_pd_alloc_bitmap;
162 static u32 dev_table_size; /* size of the device table */
163 static u32 alias_table_size; /* size of the alias table */
164 static u32 rlookup_table_size; /* size if the rlookup table */
166 static inline void update_last_devid(u16 devid)
168 if (devid > amd_iommu_last_bdf)
169 amd_iommu_last_bdf = devid;
172 static inline unsigned long tbl_size(int entry_size)
174 unsigned shift = PAGE_SHIFT +
175 get_order(amd_iommu_last_bdf * entry_size);
180 /****************************************************************************
182 * AMD IOMMU MMIO register space handling functions
184 * These functions are used to program the IOMMU device registers in
185 * MMIO space required for that driver.
187 ****************************************************************************/
190 * This function set the exclusion range in the IOMMU. DMA accesses to the
191 * exclusion range are passed through untranslated
193 static void __init iommu_set_exclusion_range(struct amd_iommu *iommu)
195 u64 start = iommu->exclusion_start & PAGE_MASK;
196 u64 limit = (start + iommu->exclusion_length) & PAGE_MASK;
199 if (!iommu->exclusion_start)
202 entry = start | MMIO_EXCL_ENABLE_MASK;
203 memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
204 &entry, sizeof(entry));
207 memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
208 &entry, sizeof(entry));
211 /* Programs the physical address of the device table into the IOMMU hardware */
212 static void __init iommu_set_device_table(struct amd_iommu *iommu)
216 BUG_ON(iommu->mmio_base == NULL);
218 entry = virt_to_phys(amd_iommu_dev_table);
219 entry |= (dev_table_size >> 12) - 1;
220 memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET,
221 &entry, sizeof(entry));
224 /* Generic functions to enable/disable certain features of the IOMMU. */
225 static void __init iommu_feature_enable(struct amd_iommu *iommu, u8 bit)
229 ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
231 writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
234 static void __init iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
238 ctrl = (u64)readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
240 writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
243 /* Function to enable the hardware */
244 void __init iommu_enable(struct amd_iommu *iommu)
246 printk(KERN_INFO "AMD IOMMU: Enabling IOMMU "
247 "at %02x:%02x.%x cap 0x%hx\n",
248 iommu->dev->bus->number,
249 PCI_SLOT(iommu->dev->devfn),
250 PCI_FUNC(iommu->dev->devfn),
253 iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
256 /* Function to enable IOMMU event logging and event interrupts */
257 void __init iommu_enable_event_logging(struct amd_iommu *iommu)
259 iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
260 iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
264 * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in
265 * the system has one.
267 static u8 * __init iommu_map_mmio_space(u64 address)
271 if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu"))
274 ret = ioremap_nocache(address, MMIO_REGION_LENGTH);
278 release_mem_region(address, MMIO_REGION_LENGTH);
283 static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu)
285 if (iommu->mmio_base)
286 iounmap(iommu->mmio_base);
287 release_mem_region(iommu->mmio_phys, MMIO_REGION_LENGTH);
290 /****************************************************************************
292 * The functions below belong to the first pass of AMD IOMMU ACPI table
293 * parsing. In this pass we try to find out the highest device id this
294 * code has to handle. Upon this information the size of the shared data
295 * structures is determined later.
297 ****************************************************************************/
300 * This function reads the last device id the IOMMU has to handle from the PCI
301 * capability header for this IOMMU
303 static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr)
307 cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);
308 update_last_devid(calc_devid(MMIO_GET_BUS(cap), MMIO_GET_LD(cap)));
314 * After reading the highest device id from the IOMMU PCI capability header
315 * this function looks if there is a higher device id defined in the ACPI table
317 static int __init find_last_devid_from_ivhd(struct ivhd_header *h)
319 u8 *p = (void *)h, *end = (void *)h;
320 struct ivhd_entry *dev;
325 find_last_devid_on_pci(PCI_BUS(h->devid),
331 dev = (struct ivhd_entry *)p;
333 case IVHD_DEV_SELECT:
334 case IVHD_DEV_RANGE_END:
336 case IVHD_DEV_EXT_SELECT:
337 /* all the above subfield types refer to device ids */
338 update_last_devid(dev->devid);
343 p += 0x04 << (*p >> 6);
352 * Iterate over all IVHD entries in the ACPI table and find the highest device
353 * id which we need to handle. This is the first of three functions which parse
354 * the ACPI table. So we check the checksum here.
356 static int __init find_last_devid_acpi(struct acpi_table_header *table)
359 u8 checksum = 0, *p = (u8 *)table, *end = (u8 *)table;
360 struct ivhd_header *h;
363 * Validate checksum here so we don't need to do it when
364 * we actually parse the table
366 for (i = 0; i < table->length; ++i)
369 /* ACPI table corrupt */
372 p += IVRS_HEADER_LENGTH;
374 end += table->length;
376 h = (struct ivhd_header *)p;
379 find_last_devid_from_ivhd(h);
391 /****************************************************************************
393 * The following functions belong the the code path which parses the ACPI table
394 * the second time. In this ACPI parsing iteration we allocate IOMMU specific
395 * data structures, initialize the device/alias/rlookup table and also
396 * basically initialize the hardware.
398 ****************************************************************************/
401 * Allocates the command buffer. This buffer is per AMD IOMMU. We can
402 * write commands to that buffer later and the IOMMU will execute them
405 static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
407 u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
408 get_order(CMD_BUFFER_SIZE));
414 iommu->cmd_buf_size = CMD_BUFFER_SIZE;
416 entry = (u64)virt_to_phys(cmd_buf);
417 entry |= MMIO_CMD_SIZE_512;
418 memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
419 &entry, sizeof(entry));
421 iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
426 static void __init free_command_buffer(struct amd_iommu *iommu)
428 free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE));
431 /* allocates the memory where the IOMMU will log its events to */
432 static u8 * __init alloc_event_buffer(struct amd_iommu *iommu)
435 iommu->evt_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
436 get_order(EVT_BUFFER_SIZE));
438 if (iommu->evt_buf == NULL)
441 entry = (u64)virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK;
442 memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
443 &entry, sizeof(entry));
445 iommu->evt_buf_size = EVT_BUFFER_SIZE;
447 return iommu->evt_buf;
450 static void __init free_event_buffer(struct amd_iommu *iommu)
452 free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE));
455 /* sets a specific bit in the device table entry. */
456 static void set_dev_entry_bit(u16 devid, u8 bit)
458 int i = (bit >> 5) & 0x07;
459 int _bit = bit & 0x1f;
461 amd_iommu_dev_table[devid].data[i] |= (1 << _bit);
464 /* Writes the specific IOMMU for a device into the rlookup table */
465 static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid)
467 amd_iommu_rlookup_table[devid] = iommu;
471 * This function takes the device specific flags read from the ACPI
472 * table and sets up the device table entry with that information
474 static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
475 u16 devid, u32 flags, u32 ext_flags)
477 if (flags & ACPI_DEVFLAG_INITPASS)
478 set_dev_entry_bit(devid, DEV_ENTRY_INIT_PASS);
479 if (flags & ACPI_DEVFLAG_EXTINT)
480 set_dev_entry_bit(devid, DEV_ENTRY_EINT_PASS);
481 if (flags & ACPI_DEVFLAG_NMI)
482 set_dev_entry_bit(devid, DEV_ENTRY_NMI_PASS);
483 if (flags & ACPI_DEVFLAG_SYSMGT1)
484 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1);
485 if (flags & ACPI_DEVFLAG_SYSMGT2)
486 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2);
487 if (flags & ACPI_DEVFLAG_LINT0)
488 set_dev_entry_bit(devid, DEV_ENTRY_LINT0_PASS);
489 if (flags & ACPI_DEVFLAG_LINT1)
490 set_dev_entry_bit(devid, DEV_ENTRY_LINT1_PASS);
492 set_iommu_for_device(iommu, devid);
496 * Reads the device exclusion range from ACPI and initialize IOMMU with
499 static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
501 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
503 if (!(m->flags & IVMD_FLAG_EXCL_RANGE))
508 * We only can configure exclusion ranges per IOMMU, not
509 * per device. But we can enable the exclusion range per
510 * device. This is done here
512 set_dev_entry_bit(m->devid, DEV_ENTRY_EX);
513 iommu->exclusion_start = m->range_start;
514 iommu->exclusion_length = m->range_length;
519 * This function reads some important data from the IOMMU PCI space and
520 * initializes the driver data structure with it. It reads the hardware
521 * capabilities and the first/last device entries
523 static void __init init_iommu_from_pci(struct amd_iommu *iommu)
525 int cap_ptr = iommu->cap_ptr;
528 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
530 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_RANGE_OFFSET,
532 pci_read_config_dword(iommu->dev, cap_ptr + MMIO_MISC_OFFSET,
535 iommu->first_device = calc_devid(MMIO_GET_BUS(range),
537 iommu->last_device = calc_devid(MMIO_GET_BUS(range),
539 iommu->evt_msi_num = MMIO_MSI_NUM(misc);
543 * Takes a pointer to an AMD IOMMU entry in the ACPI table and
544 * initializes the hardware and our data structures with it.
546 static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
547 struct ivhd_header *h)
550 u8 *end = p, flags = 0;
551 u16 dev_i, devid = 0, devid_start = 0, devid_to = 0;
554 struct ivhd_entry *e;
557 * First set the recommended feature enable bits from ACPI
558 * into the IOMMU control registers
560 h->flags & IVHD_FLAG_HT_TUN_EN ?
561 iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
562 iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
564 h->flags & IVHD_FLAG_PASSPW_EN ?
565 iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
566 iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
568 h->flags & IVHD_FLAG_RESPASSPW_EN ?
569 iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
570 iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
572 h->flags & IVHD_FLAG_ISOC_EN ?
573 iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
574 iommu_feature_disable(iommu, CONTROL_ISOC_EN);
577 * make IOMMU memory accesses cache coherent
579 iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
582 * Done. Now parse the device entries
584 p += sizeof(struct ivhd_header);
588 e = (struct ivhd_entry *)p;
591 for (dev_i = iommu->first_device;
592 dev_i <= iommu->last_device; ++dev_i)
593 set_dev_entry_from_acpi(iommu, dev_i,
596 case IVHD_DEV_SELECT:
598 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
600 case IVHD_DEV_SELECT_RANGE_START:
601 devid_start = e->devid;
608 devid_to = e->ext >> 8;
609 set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
610 amd_iommu_alias_table[devid] = devid_to;
612 case IVHD_DEV_ALIAS_RANGE:
613 devid_start = e->devid;
615 devid_to = e->ext >> 8;
619 case IVHD_DEV_EXT_SELECT:
621 set_dev_entry_from_acpi(iommu, devid, e->flags,
624 case IVHD_DEV_EXT_SELECT_RANGE:
625 devid_start = e->devid;
630 case IVHD_DEV_RANGE_END:
632 for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
634 amd_iommu_alias_table[dev_i] = devid_to;
635 set_dev_entry_from_acpi(iommu,
636 amd_iommu_alias_table[dev_i],
644 p += 0x04 << (e->type >> 6);
648 /* Initializes the device->iommu mapping for the driver */
649 static int __init init_iommu_devices(struct amd_iommu *iommu)
653 for (i = iommu->first_device; i <= iommu->last_device; ++i)
654 set_iommu_for_device(iommu, i);
659 static void __init free_iommu_one(struct amd_iommu *iommu)
661 free_command_buffer(iommu);
662 free_event_buffer(iommu);
663 iommu_unmap_mmio_space(iommu);
666 static void __init free_iommu_all(void)
668 struct amd_iommu *iommu, *next;
670 list_for_each_entry_safe(iommu, next, &amd_iommu_list, list) {
671 list_del(&iommu->list);
672 free_iommu_one(iommu);
678 * This function clues the initialization function for one IOMMU
679 * together and also allocates the command buffer and programs the
680 * hardware. It does NOT enable the IOMMU. This is done afterwards.
682 static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
684 spin_lock_init(&iommu->lock);
685 list_add_tail(&iommu->list, &amd_iommu_list);
688 * Copy data from ACPI table entry to the iommu struct
690 iommu->dev = pci_get_bus_and_slot(PCI_BUS(h->devid), h->devid & 0xff);
694 iommu->cap_ptr = h->cap_ptr;
695 iommu->pci_seg = h->pci_seg;
696 iommu->mmio_phys = h->mmio_phys;
697 iommu->mmio_base = iommu_map_mmio_space(h->mmio_phys);
698 if (!iommu->mmio_base)
701 iommu_set_device_table(iommu);
702 iommu->cmd_buf = alloc_command_buffer(iommu);
706 iommu->evt_buf = alloc_event_buffer(iommu);
710 iommu->int_enabled = false;
712 init_iommu_from_pci(iommu);
713 init_iommu_from_acpi(iommu, h);
714 init_iommu_devices(iommu);
716 pci_enable_device(iommu->dev);
722 * Iterates over all IOMMU entries in the ACPI table, allocates the
723 * IOMMU structure and initializes it with init_iommu_one()
725 static int __init init_iommu_all(struct acpi_table_header *table)
727 u8 *p = (u8 *)table, *end = (u8 *)table;
728 struct ivhd_header *h;
729 struct amd_iommu *iommu;
732 end += table->length;
733 p += IVRS_HEADER_LENGTH;
736 h = (struct ivhd_header *)p;
739 iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
742 ret = init_iommu_one(iommu, h);
757 /****************************************************************************
759 * The following functions initialize the MSI interrupts for all IOMMUs
760 * in the system. Its a bit challenging because there could be multiple
761 * IOMMUs per PCI BDF but we can call pci_enable_msi(x) only once per
764 ****************************************************************************/
766 static int __init iommu_setup_msix(struct amd_iommu *iommu)
768 struct amd_iommu *curr;
769 struct msix_entry entries[32]; /* only 32 supported by AMD IOMMU */
772 list_for_each_entry(curr, &amd_iommu_list, list) {
773 if (curr->dev == iommu->dev) {
774 entries[nvec].entry = curr->evt_msi_num;
775 entries[nvec].vector = 0;
776 curr->int_enabled = true;
781 if (pci_enable_msix(iommu->dev, entries, nvec)) {
782 pci_disable_msix(iommu->dev);
786 for (i = 0; i < nvec; ++i) {
787 int r = request_irq(entries->vector, amd_iommu_int_handler,
798 for (i -= 1; i >= 0; --i)
799 free_irq(entries->vector, NULL);
801 pci_disable_msix(iommu->dev);
806 static int __init iommu_setup_msi(struct amd_iommu *iommu)
809 struct amd_iommu *curr;
811 list_for_each_entry(curr, &amd_iommu_list, list) {
812 if (curr->dev == iommu->dev)
813 curr->int_enabled = true;
817 if (pci_enable_msi(iommu->dev))
820 r = request_irq(iommu->dev->irq, amd_iommu_int_handler,
826 pci_disable_msi(iommu->dev);
833 static int __init iommu_init_msi(struct amd_iommu *iommu)
835 if (iommu->int_enabled)
838 if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSIX))
839 return iommu_setup_msix(iommu);
840 else if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI))
841 return iommu_setup_msi(iommu);
846 /****************************************************************************
848 * The next functions belong to the third pass of parsing the ACPI
849 * table. In this last pass the memory mapping requirements are
850 * gathered (like exclusion and unity mapping reanges).
852 ****************************************************************************/
854 static void __init free_unity_maps(void)
856 struct unity_map_entry *entry, *next;
858 list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {
859 list_del(&entry->list);
864 /* called when we find an exclusion range definition in ACPI */
865 static int __init init_exclusion_range(struct ivmd_header *m)
871 set_device_exclusion_range(m->devid, m);
873 case ACPI_IVMD_TYPE_ALL:
874 for (i = 0; i <= amd_iommu_last_bdf; ++i)
875 set_device_exclusion_range(i, m);
877 case ACPI_IVMD_TYPE_RANGE:
878 for (i = m->devid; i <= m->aux; ++i)
879 set_device_exclusion_range(i, m);
888 /* called for unity map ACPI definition */
889 static int __init init_unity_map_range(struct ivmd_header *m)
891 struct unity_map_entry *e = 0;
893 e = kzalloc(sizeof(*e), GFP_KERNEL);
900 e->devid_start = e->devid_end = m->devid;
902 case ACPI_IVMD_TYPE_ALL:
904 e->devid_end = amd_iommu_last_bdf;
906 case ACPI_IVMD_TYPE_RANGE:
907 e->devid_start = m->devid;
908 e->devid_end = m->aux;
911 e->address_start = PAGE_ALIGN(m->range_start);
912 e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
913 e->prot = m->flags >> 1;
915 list_add_tail(&e->list, &amd_iommu_unity_map);
920 /* iterates over all memory definitions we find in the ACPI table */
921 static int __init init_memory_definitions(struct acpi_table_header *table)
923 u8 *p = (u8 *)table, *end = (u8 *)table;
924 struct ivmd_header *m;
926 end += table->length;
927 p += IVRS_HEADER_LENGTH;
930 m = (struct ivmd_header *)p;
931 if (m->flags & IVMD_FLAG_EXCL_RANGE)
932 init_exclusion_range(m);
933 else if (m->flags & IVMD_FLAG_UNITY_MAP)
934 init_unity_map_range(m);
943 * Init the device table to not allow DMA access for devices and
944 * suppress all page faults
946 static void init_device_table(void)
950 for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
951 set_dev_entry_bit(devid, DEV_ENTRY_VALID);
952 set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
957 * This function finally enables all IOMMUs found in the system after
958 * they have been initialized
960 static void __init enable_iommus(void)
962 struct amd_iommu *iommu;
964 list_for_each_entry(iommu, &amd_iommu_list, list) {
965 iommu_set_exclusion_range(iommu);
966 iommu_init_msi(iommu);
967 iommu_enable_event_logging(iommu);
973 * Suspend/Resume support
974 * disable suspend until real resume implemented
977 static int amd_iommu_resume(struct sys_device *dev)
982 static int amd_iommu_suspend(struct sys_device *dev, pm_message_t state)
987 static struct sysdev_class amd_iommu_sysdev_class = {
989 .suspend = amd_iommu_suspend,
990 .resume = amd_iommu_resume,
993 static struct sys_device device_amd_iommu = {
995 .cls = &amd_iommu_sysdev_class,
999 * This is the core init function for AMD IOMMU hardware in the system.
1000 * This function is called from the generic x86 DMA layer initialization
1003 * This function basically parses the ACPI table for AMD IOMMU (IVRS)
1006 * 1 pass) Find the highest PCI device id the driver has to handle.
1007 * Upon this information the size of the data structures is
1008 * determined that needs to be allocated.
1010 * 2 pass) Initialize the data structures just allocated with the
1011 * information in the ACPI table about available AMD IOMMUs
1012 * in the system. It also maps the PCI devices in the
1013 * system to specific IOMMUs
1015 * 3 pass) After the basic data structures are allocated and
1016 * initialized we update them with information about memory
1017 * remapping requirements parsed out of the ACPI table in
1020 * After that the hardware is initialized and ready to go. In the last
1021 * step we do some Linux specific things like registering the driver in
1022 * the dma_ops interface and initializing the suspend/resume support
1023 * functions. Finally it prints some information about AMD IOMMUs and
1024 * the driver state and enables the hardware.
1026 int __init amd_iommu_init(void)
1032 printk(KERN_INFO "AMD IOMMU disabled by kernel command line\n");
1036 if (!amd_iommu_detected)
1040 * First parse ACPI tables to find the largest Bus/Dev/Func
1041 * we need to handle. Upon this information the shared data
1042 * structures for the IOMMUs in the system will be allocated
1044 if (acpi_table_parse("IVRS", find_last_devid_acpi) != 0)
1047 dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE);
1048 alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
1049 rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);
1053 /* Device table - directly used by all IOMMUs */
1054 amd_iommu_dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
1055 get_order(dev_table_size));
1056 if (amd_iommu_dev_table == NULL)
1060 * Alias table - map PCI Bus/Dev/Func to Bus/Dev/Func the
1061 * IOMMU see for that device
1063 amd_iommu_alias_table = (void *)__get_free_pages(GFP_KERNEL,
1064 get_order(alias_table_size));
1065 if (amd_iommu_alias_table == NULL)
1068 /* IOMMU rlookup table - find the IOMMU for a specific device */
1069 amd_iommu_rlookup_table = (void *)__get_free_pages(GFP_KERNEL,
1070 get_order(rlookup_table_size));
1071 if (amd_iommu_rlookup_table == NULL)
1075 * Protection Domain table - maps devices to protection domains
1076 * This table has the same size as the rlookup_table
1078 amd_iommu_pd_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
1079 get_order(rlookup_table_size));
1080 if (amd_iommu_pd_table == NULL)
1083 amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(
1084 GFP_KERNEL | __GFP_ZERO,
1085 get_order(MAX_DOMAIN_ID/8));
1086 if (amd_iommu_pd_alloc_bitmap == NULL)
1089 /* init the device table */
1090 init_device_table();
1093 * let all alias entries point to itself
1095 for (i = 0; i <= amd_iommu_last_bdf; ++i)
1096 amd_iommu_alias_table[i] = i;
1099 * never allocate domain 0 because its used as the non-allocated and
1100 * error value placeholder
1102 amd_iommu_pd_alloc_bitmap[0] = 1;
1105 * now the data structures are allocated and basically initialized
1106 * start the real acpi table scan
1109 if (acpi_table_parse("IVRS", init_iommu_all) != 0)
1112 if (acpi_table_parse("IVRS", init_memory_definitions) != 0)
1115 ret = sysdev_class_register(&amd_iommu_sysdev_class);
1119 ret = sysdev_register(&device_amd_iommu);
1123 ret = amd_iommu_init_dma_ops();
1129 printk(KERN_INFO "AMD IOMMU: aperture size is %d MB\n",
1130 (1 << (amd_iommu_aperture_order-20)));
1132 printk(KERN_INFO "AMD IOMMU: device isolation ");
1133 if (amd_iommu_isolate)
1134 printk("enabled\n");
1136 printk("disabled\n");
1138 if (iommu_fullflush)
1139 printk(KERN_INFO "AMD IOMMU: IO/TLB flush on unmap enabled\n");
1141 printk(KERN_INFO "AMD IOMMU: Lazy IO/TLB flushing enabled\n");
1147 free_pages((unsigned long)amd_iommu_pd_alloc_bitmap, 1);
1149 free_pages((unsigned long)amd_iommu_pd_table,
1150 get_order(rlookup_table_size));
1152 free_pages((unsigned long)amd_iommu_rlookup_table,
1153 get_order(rlookup_table_size));
1155 free_pages((unsigned long)amd_iommu_alias_table,
1156 get_order(alias_table_size));
1158 free_pages((unsigned long)amd_iommu_dev_table,
1159 get_order(dev_table_size));
1168 /****************************************************************************
1170 * Early detect code. This code runs at IOMMU detection time in the DMA
1171 * layer. It just looks if there is an IVRS ACPI table to detect AMD
1174 ****************************************************************************/
1175 static int __init early_amd_iommu_detect(struct acpi_table_header *table)
1180 void __init amd_iommu_detect(void)
1182 if (swiotlb || no_iommu || (iommu_detected && !gart_iommu_aperture))
1185 if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
1187 amd_iommu_detected = 1;
1188 #ifdef CONFIG_GART_IOMMU
1189 gart_iommu_aperture_disabled = 1;
1190 gart_iommu_aperture = 0;
1195 /****************************************************************************
1197 * Parsing functions for the AMD IOMMU specific kernel command line
1200 ****************************************************************************/
1202 static int __init parse_amd_iommu_options(char *str)
1204 for (; *str; ++str) {
1205 if (strncmp(str, "isolate", 7) == 0)
1206 amd_iommu_isolate = 1;
1212 static int __init parse_amd_iommu_size_options(char *str)
1214 unsigned order = PAGE_SHIFT + get_order(memparse(str, &str));
1216 if ((order > 24) && (order < 31))
1217 amd_iommu_aperture_order = order;
1222 __setup("amd_iommu=", parse_amd_iommu_options);
1223 __setup("amd_iommu_size=", parse_amd_iommu_size_options);