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 <asm/pci-direct.h>
26 #include <asm/amd_iommu_types.h>
27 #include <asm/amd_iommu.h>
31 * definitions for the ACPI scanning code
33 #define DEVID(bus, devfn) (((bus) << 8) | (devfn))
34 #define PCI_BUS(x) (((x) >> 8) & 0xff)
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 struct 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 struct 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 at ");
247 print_devid(iommu->devid, 0);
248 printk(" cap 0x%hx\n", iommu->cap_ptr);
250 iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
254 * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in
255 * the system has one.
257 static u8 * __init iommu_map_mmio_space(u64 address)
261 if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu"))
264 ret = ioremap_nocache(address, MMIO_REGION_LENGTH);
268 release_mem_region(address, MMIO_REGION_LENGTH);
273 static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu)
275 if (iommu->mmio_base)
276 iounmap(iommu->mmio_base);
277 release_mem_region(iommu->mmio_phys, MMIO_REGION_LENGTH);
280 /****************************************************************************
282 * The functions below belong to the first pass of AMD IOMMU ACPI table
283 * parsing. In this pass we try to find out the highest device id this
284 * code has to handle. Upon this information the size of the shared data
285 * structures is determined later.
287 ****************************************************************************/
290 * This function reads the last device id the IOMMU has to handle from the PCI
291 * capability header for this IOMMU
293 static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr)
297 cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);
298 update_last_devid(DEVID(MMIO_GET_BUS(cap), MMIO_GET_LD(cap)));
304 * After reading the highest device id from the IOMMU PCI capability header
305 * this function looks if there is a higher device id defined in the ACPI table
307 static int __init find_last_devid_from_ivhd(struct ivhd_header *h)
309 u8 *p = (void *)h, *end = (void *)h;
310 struct ivhd_entry *dev;
315 find_last_devid_on_pci(PCI_BUS(h->devid),
321 dev = (struct ivhd_entry *)p;
323 case IVHD_DEV_SELECT:
324 case IVHD_DEV_RANGE_END:
326 case IVHD_DEV_EXT_SELECT:
327 /* all the above subfield types refer to device ids */
328 update_last_devid(dev->devid);
333 p += 0x04 << (*p >> 6);
342 * Iterate over all IVHD entries in the ACPI table and find the highest device
343 * id which we need to handle. This is the first of three functions which parse
344 * the ACPI table. So we check the checksum here.
346 static int __init find_last_devid_acpi(struct acpi_table_header *table)
349 u8 checksum = 0, *p = (u8 *)table, *end = (u8 *)table;
350 struct ivhd_header *h;
353 * Validate checksum here so we don't need to do it when
354 * we actually parse the table
356 for (i = 0; i < table->length; ++i)
359 /* ACPI table corrupt */
362 p += IVRS_HEADER_LENGTH;
364 end += table->length;
366 h = (struct ivhd_header *)p;
369 find_last_devid_from_ivhd(h);
381 /****************************************************************************
383 * The following functions belong the the code path which parses the ACPI table
384 * the second time. In this ACPI parsing iteration we allocate IOMMU specific
385 * data structures, initialize the device/alias/rlookup table and also
386 * basically initialize the hardware.
388 ****************************************************************************/
391 * Allocates the command buffer. This buffer is per AMD IOMMU. We can
392 * write commands to that buffer later and the IOMMU will execute them
395 static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
397 u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
398 get_order(CMD_BUFFER_SIZE));
404 iommu->cmd_buf_size = CMD_BUFFER_SIZE;
406 entry = (u64)virt_to_phys(cmd_buf);
407 entry |= MMIO_CMD_SIZE_512;
408 memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
409 &entry, sizeof(entry));
411 iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
416 static void __init free_command_buffer(struct amd_iommu *iommu)
418 free_pages((unsigned long)iommu->cmd_buf, get_order(CMD_BUFFER_SIZE));
421 /* sets a specific bit in the device table entry. */
422 static void set_dev_entry_bit(u16 devid, u8 bit)
424 int i = (bit >> 5) & 0x07;
425 int _bit = bit & 0x1f;
427 amd_iommu_dev_table[devid].data[i] |= (1 << _bit);
431 * This function takes the device specific flags read from the ACPI
432 * table and sets up the device table entry with that information
434 static void __init set_dev_entry_from_acpi(u16 devid, u32 flags, u32 ext_flags)
436 if (flags & ACPI_DEVFLAG_INITPASS)
437 set_dev_entry_bit(devid, DEV_ENTRY_INIT_PASS);
438 if (flags & ACPI_DEVFLAG_EXTINT)
439 set_dev_entry_bit(devid, DEV_ENTRY_EINT_PASS);
440 if (flags & ACPI_DEVFLAG_NMI)
441 set_dev_entry_bit(devid, DEV_ENTRY_NMI_PASS);
442 if (flags & ACPI_DEVFLAG_SYSMGT1)
443 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1);
444 if (flags & ACPI_DEVFLAG_SYSMGT2)
445 set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2);
446 if (flags & ACPI_DEVFLAG_LINT0)
447 set_dev_entry_bit(devid, DEV_ENTRY_LINT0_PASS);
448 if (flags & ACPI_DEVFLAG_LINT1)
449 set_dev_entry_bit(devid, DEV_ENTRY_LINT1_PASS);
452 /* Writes the specific IOMMU for a device into the rlookup table */
453 static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid)
455 amd_iommu_rlookup_table[devid] = iommu;
459 * Reads the device exclusion range from ACPI and initialize IOMMU with
462 static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
464 struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
466 if (!(m->flags & IVMD_FLAG_EXCL_RANGE))
471 * We only can configure exclusion ranges per IOMMU, not
472 * per device. But we can enable the exclusion range per
473 * device. This is done here
475 set_dev_entry_bit(m->devid, DEV_ENTRY_EX);
476 iommu->exclusion_start = m->range_start;
477 iommu->exclusion_length = m->range_length;
482 * This function reads some important data from the IOMMU PCI space and
483 * initializes the driver data structure with it. It reads the hardware
484 * capabilities and the first/last device entries
486 static void __init init_iommu_from_pci(struct amd_iommu *iommu)
488 int bus = PCI_BUS(iommu->devid);
489 int dev = PCI_SLOT(iommu->devid);
490 int fn = PCI_FUNC(iommu->devid);
491 int cap_ptr = iommu->cap_ptr;
494 iommu->cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_CAP_HDR_OFFSET);
496 range = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);
497 iommu->first_device = DEVID(MMIO_GET_BUS(range), MMIO_GET_FD(range));
498 iommu->last_device = DEVID(MMIO_GET_BUS(range), MMIO_GET_LD(range));
502 * Takes a pointer to an AMD IOMMU entry in the ACPI table and
503 * initializes the hardware and our data structures with it.
505 static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
506 struct ivhd_header *h)
509 u8 *end = p, flags = 0;
510 u16 dev_i, devid = 0, devid_start = 0, devid_to = 0;
513 struct ivhd_entry *e;
516 * First set the recommended feature enable bits from ACPI
517 * into the IOMMU control registers
519 h->flags & IVHD_FLAG_HT_TUN_EN ?
520 iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
521 iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
523 h->flags & IVHD_FLAG_PASSPW_EN ?
524 iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
525 iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
527 h->flags & IVHD_FLAG_RESPASSPW_EN ?
528 iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
529 iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
531 h->flags & IVHD_FLAG_ISOC_EN ?
532 iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
533 iommu_feature_disable(iommu, CONTROL_ISOC_EN);
536 * make IOMMU memory accesses cache coherent
538 iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
541 * Done. Now parse the device entries
543 p += sizeof(struct ivhd_header);
547 e = (struct ivhd_entry *)p;
550 for (dev_i = iommu->first_device;
551 dev_i <= iommu->last_device; ++dev_i)
552 set_dev_entry_from_acpi(dev_i, e->flags, 0);
554 case IVHD_DEV_SELECT:
556 set_dev_entry_from_acpi(devid, e->flags, 0);
558 case IVHD_DEV_SELECT_RANGE_START:
559 devid_start = e->devid;
566 devid_to = e->ext >> 8;
567 set_dev_entry_from_acpi(devid, e->flags, 0);
568 amd_iommu_alias_table[devid] = devid_to;
570 case IVHD_DEV_ALIAS_RANGE:
571 devid_start = e->devid;
573 devid_to = e->ext >> 8;
577 case IVHD_DEV_EXT_SELECT:
579 set_dev_entry_from_acpi(devid, e->flags, e->ext);
581 case IVHD_DEV_EXT_SELECT_RANGE:
582 devid_start = e->devid;
587 case IVHD_DEV_RANGE_END:
589 for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
591 amd_iommu_alias_table[dev_i] = devid_to;
592 set_dev_entry_from_acpi(
593 amd_iommu_alias_table[dev_i],
601 p += 0x04 << (e->type >> 6);
605 /* Initializes the device->iommu mapping for the driver */
606 static int __init init_iommu_devices(struct amd_iommu *iommu)
610 for (i = iommu->first_device; i <= iommu->last_device; ++i)
611 set_iommu_for_device(iommu, i);
616 static void __init free_iommu_one(struct amd_iommu *iommu)
618 free_command_buffer(iommu);
619 iommu_unmap_mmio_space(iommu);
622 static void __init free_iommu_all(void)
624 struct amd_iommu *iommu, *next;
626 list_for_each_entry_safe(iommu, next, &amd_iommu_list, list) {
627 list_del(&iommu->list);
628 free_iommu_one(iommu);
634 * This function clues the initialization function for one IOMMU
635 * together and also allocates the command buffer and programs the
636 * hardware. It does NOT enable the IOMMU. This is done afterwards.
638 static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
640 spin_lock_init(&iommu->lock);
641 list_add_tail(&iommu->list, &amd_iommu_list);
644 * Copy data from ACPI table entry to the iommu struct
646 iommu->devid = h->devid;
647 iommu->cap_ptr = h->cap_ptr;
648 iommu->mmio_phys = h->mmio_phys;
649 iommu->mmio_base = iommu_map_mmio_space(h->mmio_phys);
650 if (!iommu->mmio_base)
653 iommu_set_device_table(iommu);
654 iommu->cmd_buf = alloc_command_buffer(iommu);
658 init_iommu_from_pci(iommu);
659 init_iommu_from_acpi(iommu, h);
660 init_iommu_devices(iommu);
666 * Iterates over all IOMMU entries in the ACPI table, allocates the
667 * IOMMU structure and initializes it with init_iommu_one()
669 static int __init init_iommu_all(struct acpi_table_header *table)
671 u8 *p = (u8 *)table, *end = (u8 *)table;
672 struct ivhd_header *h;
673 struct amd_iommu *iommu;
676 INIT_LIST_HEAD(&amd_iommu_list);
678 end += table->length;
679 p += IVRS_HEADER_LENGTH;
682 h = (struct ivhd_header *)p;
685 iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
688 ret = init_iommu_one(iommu, h);
703 /****************************************************************************
705 * The next functions belong to the third pass of parsing the ACPI
706 * table. In this last pass the memory mapping requirements are
707 * gathered (like exclusion and unity mapping reanges).
709 ****************************************************************************/
711 static void __init free_unity_maps(void)
713 struct unity_map_entry *entry, *next;
715 list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {
716 list_del(&entry->list);
721 /* called when we find an exclusion range definition in ACPI */
722 static int __init init_exclusion_range(struct ivmd_header *m)
728 set_device_exclusion_range(m->devid, m);
730 case ACPI_IVMD_TYPE_ALL:
731 for (i = 0; i < amd_iommu_last_bdf; ++i)
732 set_device_exclusion_range(i, m);
734 case ACPI_IVMD_TYPE_RANGE:
735 for (i = m->devid; i <= m->aux; ++i)
736 set_device_exclusion_range(i, m);
745 /* called for unity map ACPI definition */
746 static int __init init_unity_map_range(struct ivmd_header *m)
748 struct unity_map_entry *e = 0;
750 e = kzalloc(sizeof(*e), GFP_KERNEL);
757 e->devid_start = e->devid_end = m->devid;
759 case ACPI_IVMD_TYPE_ALL:
761 e->devid_end = amd_iommu_last_bdf;
763 case ACPI_IVMD_TYPE_RANGE:
764 e->devid_start = m->devid;
765 e->devid_end = m->aux;
768 e->address_start = PAGE_ALIGN(m->range_start);
769 e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
770 e->prot = m->flags >> 1;
772 list_add_tail(&e->list, &amd_iommu_unity_map);
777 /* iterates over all memory definitions we find in the ACPI table */
778 static int __init init_memory_definitions(struct acpi_table_header *table)
780 u8 *p = (u8 *)table, *end = (u8 *)table;
781 struct ivmd_header *m;
783 INIT_LIST_HEAD(&amd_iommu_unity_map);
785 end += table->length;
786 p += IVRS_HEADER_LENGTH;
789 m = (struct ivmd_header *)p;
790 if (m->flags & IVMD_FLAG_EXCL_RANGE)
791 init_exclusion_range(m);
792 else if (m->flags & IVMD_FLAG_UNITY_MAP)
793 init_unity_map_range(m);
802 * This function finally enables all IOMMUs found in the system after
803 * they have been initialized
805 static void __init enable_iommus(void)
807 struct amd_iommu *iommu;
809 list_for_each_entry(iommu, &amd_iommu_list, list) {
810 iommu_set_exclusion_range(iommu);
816 * Suspend/Resume support
817 * disable suspend until real resume implemented
820 static int amd_iommu_resume(struct sys_device *dev)
825 static int amd_iommu_suspend(struct sys_device *dev, pm_message_t state)
830 static struct sysdev_class amd_iommu_sysdev_class = {
832 .suspend = amd_iommu_suspend,
833 .resume = amd_iommu_resume,
836 static struct sys_device device_amd_iommu = {
838 .cls = &amd_iommu_sysdev_class,
842 * This is the core init function for AMD IOMMU hardware in the system.
843 * This function is called from the generic x86 DMA layer initialization
846 * This function basically parses the ACPI table for AMD IOMMU (IVRS)
849 * 1 pass) Find the highest PCI device id the driver has to handle.
850 * Upon this information the size of the data structures is
851 * determined that needs to be allocated.
853 * 2 pass) Initialize the data structures just allocated with the
854 * information in the ACPI table about available AMD IOMMUs
855 * in the system. It also maps the PCI devices in the
856 * system to specific IOMMUs
858 * 3 pass) After the basic data structures are allocated and
859 * initialized we update them with information about memory
860 * remapping requirements parsed out of the ACPI table in
863 * After that the hardware is initialized and ready to go. In the last
864 * step we do some Linux specific things like registering the driver in
865 * the dma_ops interface and initializing the suspend/resume support
866 * functions. Finally it prints some information about AMD IOMMUs and
867 * the driver state and enables the hardware.
869 int __init amd_iommu_init(void)
875 printk(KERN_INFO "AMD IOMMU disabled by kernel command line\n");
879 if (!amd_iommu_detected)
883 * First parse ACPI tables to find the largest Bus/Dev/Func
884 * we need to handle. Upon this information the shared data
885 * structures for the IOMMUs in the system will be allocated
887 if (acpi_table_parse("IVRS", find_last_devid_acpi) != 0)
890 dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE);
891 alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
892 rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);
896 /* Device table - directly used by all IOMMUs */
897 amd_iommu_dev_table = (void *)__get_free_pages(GFP_KERNEL,
898 get_order(dev_table_size));
899 if (amd_iommu_dev_table == NULL)
903 * Alias table - map PCI Bus/Dev/Func to Bus/Dev/Func the
904 * IOMMU see for that device
906 amd_iommu_alias_table = (void *)__get_free_pages(GFP_KERNEL,
907 get_order(alias_table_size));
908 if (amd_iommu_alias_table == NULL)
911 /* IOMMU rlookup table - find the IOMMU for a specific device */
912 amd_iommu_rlookup_table = (void *)__get_free_pages(GFP_KERNEL,
913 get_order(rlookup_table_size));
914 if (amd_iommu_rlookup_table == NULL)
918 * Protection Domain table - maps devices to protection domains
919 * This table has the same size as the rlookup_table
921 amd_iommu_pd_table = (void *)__get_free_pages(GFP_KERNEL,
922 get_order(rlookup_table_size));
923 if (amd_iommu_pd_table == NULL)
926 amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(GFP_KERNEL,
927 get_order(MAX_DOMAIN_ID/8));
928 if (amd_iommu_pd_alloc_bitmap == NULL)
932 * memory is allocated now; initialize the device table with all zeroes
933 * and let all alias entries point to itself
935 memset(amd_iommu_dev_table, 0, dev_table_size);
936 for (i = 0; i < amd_iommu_last_bdf; ++i)
937 amd_iommu_alias_table[i] = i;
939 memset(amd_iommu_pd_table, 0, rlookup_table_size);
940 memset(amd_iommu_pd_alloc_bitmap, 0, MAX_DOMAIN_ID / 8);
943 * never allocate domain 0 because its used as the non-allocated and
944 * error value placeholder
946 amd_iommu_pd_alloc_bitmap[0] = 1;
949 * now the data structures are allocated and basically initialized
950 * start the real acpi table scan
953 if (acpi_table_parse("IVRS", init_iommu_all) != 0)
956 if (acpi_table_parse("IVRS", init_memory_definitions) != 0)
959 ret = amd_iommu_init_dma_ops();
963 ret = sysdev_class_register(&amd_iommu_sysdev_class);
967 ret = sysdev_register(&device_amd_iommu);
973 printk(KERN_INFO "AMD IOMMU: aperture size is %d MB\n",
974 (1 << (amd_iommu_aperture_order-20)));
976 printk(KERN_INFO "AMD IOMMU: device isolation ");
977 if (amd_iommu_isolate)
980 printk("disabled\n");
986 free_pages((unsigned long)amd_iommu_pd_alloc_bitmap, 1);
988 free_pages((unsigned long)amd_iommu_pd_table,
989 get_order(rlookup_table_size));
991 free_pages((unsigned long)amd_iommu_rlookup_table,
992 get_order(rlookup_table_size));
994 free_pages((unsigned long)amd_iommu_alias_table,
995 get_order(alias_table_size));
997 free_pages((unsigned long)amd_iommu_dev_table,
998 get_order(dev_table_size));
1007 /****************************************************************************
1009 * Early detect code. This code runs at IOMMU detection time in the DMA
1010 * layer. It just looks if there is an IVRS ACPI table to detect AMD
1013 ****************************************************************************/
1014 static int __init early_amd_iommu_detect(struct acpi_table_header *table)
1019 void __init amd_iommu_detect(void)
1021 if (swiotlb || no_iommu || (iommu_detected && !gart_iommu_aperture))
1024 if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
1026 amd_iommu_detected = 1;
1027 #ifdef CONFIG_GART_IOMMU
1028 gart_iommu_aperture_disabled = 1;
1029 gart_iommu_aperture = 0;
1034 /****************************************************************************
1036 * Parsing functions for the AMD IOMMU specific kernel command line
1039 ****************************************************************************/
1041 static int __init parse_amd_iommu_options(char *str)
1043 for (; *str; ++str) {
1044 if (strcmp(str, "isolate") == 0)
1045 amd_iommu_isolate = 1;
1051 static int __init parse_amd_iommu_size_options(char *str)
1053 for (; *str; ++str) {
1054 if (strcmp(str, "32M") == 0)
1055 amd_iommu_aperture_order = 25;
1056 if (strcmp(str, "64M") == 0)
1057 amd_iommu_aperture_order = 26;
1058 if (strcmp(str, "128M") == 0)
1059 amd_iommu_aperture_order = 27;
1060 if (strcmp(str, "256M") == 0)
1061 amd_iommu_aperture_order = 28;
1062 if (strcmp(str, "512M") == 0)
1063 amd_iommu_aperture_order = 29;
1064 if (strcmp(str, "1G") == 0)
1065 amd_iommu_aperture_order = 30;
1071 __setup("amd_iommu=", parse_amd_iommu_options);
1072 __setup("amd_iommu_size=", parse_amd_iommu_size_options);