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Diffstat (limited to 'arch/x86/kernel/amd_iommu_init.c')
-rw-r--r--arch/x86/kernel/amd_iommu_init.c1572
1 files changed, 0 insertions, 1572 deletions
diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
deleted file mode 100644
index bfc8453bd98d..000000000000
--- a/arch/x86/kernel/amd_iommu_init.c
+++ /dev/null
@@ -1,1572 +0,0 @@
-/*
- * Copyright (C) 2007-2010 Advanced Micro Devices, Inc.
- * Author: Joerg Roedel <joerg.roedel@amd.com>
- * Leo Duran <leo.duran@amd.com>
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 as published
- * by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#include <linux/pci.h>
-#include <linux/acpi.h>
-#include <linux/list.h>
-#include <linux/slab.h>
-#include <linux/syscore_ops.h>
-#include <linux/interrupt.h>
-#include <linux/msi.h>
-#include <asm/pci-direct.h>
-#include <asm/amd_iommu_proto.h>
-#include <asm/amd_iommu_types.h>
-#include <asm/amd_iommu.h>
-#include <asm/iommu.h>
-#include <asm/gart.h>
-#include <asm/x86_init.h>
-#include <asm/iommu_table.h>
-/*
- * definitions for the ACPI scanning code
- */
-#define IVRS_HEADER_LENGTH 48
-
-#define ACPI_IVHD_TYPE 0x10
-#define ACPI_IVMD_TYPE_ALL 0x20
-#define ACPI_IVMD_TYPE 0x21
-#define ACPI_IVMD_TYPE_RANGE 0x22
-
-#define IVHD_DEV_ALL 0x01
-#define IVHD_DEV_SELECT 0x02
-#define IVHD_DEV_SELECT_RANGE_START 0x03
-#define IVHD_DEV_RANGE_END 0x04
-#define IVHD_DEV_ALIAS 0x42
-#define IVHD_DEV_ALIAS_RANGE 0x43
-#define IVHD_DEV_EXT_SELECT 0x46
-#define IVHD_DEV_EXT_SELECT_RANGE 0x47
-
-#define IVHD_FLAG_HT_TUN_EN_MASK 0x01
-#define IVHD_FLAG_PASSPW_EN_MASK 0x02
-#define IVHD_FLAG_RESPASSPW_EN_MASK 0x04
-#define IVHD_FLAG_ISOC_EN_MASK 0x08
-
-#define IVMD_FLAG_EXCL_RANGE 0x08
-#define IVMD_FLAG_UNITY_MAP 0x01
-
-#define ACPI_DEVFLAG_INITPASS 0x01
-#define ACPI_DEVFLAG_EXTINT 0x02
-#define ACPI_DEVFLAG_NMI 0x04
-#define ACPI_DEVFLAG_SYSMGT1 0x10
-#define ACPI_DEVFLAG_SYSMGT2 0x20
-#define ACPI_DEVFLAG_LINT0 0x40
-#define ACPI_DEVFLAG_LINT1 0x80
-#define ACPI_DEVFLAG_ATSDIS 0x10000000
-
-/*
- * ACPI table definitions
- *
- * These data structures are laid over the table to parse the important values
- * out of it.
- */
-
-/*
- * structure describing one IOMMU in the ACPI table. Typically followed by one
- * or more ivhd_entrys.
- */
-struct ivhd_header {
- u8 type;
- u8 flags;
- u16 length;
- u16 devid;
- u16 cap_ptr;
- u64 mmio_phys;
- u16 pci_seg;
- u16 info;
- u32 reserved;
-} __attribute__((packed));
-
-/*
- * A device entry describing which devices a specific IOMMU translates and
- * which requestor ids they use.
- */
-struct ivhd_entry {
- u8 type;
- u16 devid;
- u8 flags;
- u32 ext;
-} __attribute__((packed));
-
-/*
- * An AMD IOMMU memory definition structure. It defines things like exclusion
- * ranges for devices and regions that should be unity mapped.
- */
-struct ivmd_header {
- u8 type;
- u8 flags;
- u16 length;
- u16 devid;
- u16 aux;
- u64 resv;
- u64 range_start;
- u64 range_length;
-} __attribute__((packed));
-
-bool amd_iommu_dump;
-
-static int __initdata amd_iommu_detected;
-static bool __initdata amd_iommu_disabled;
-
-u16 amd_iommu_last_bdf; /* largest PCI device id we have
- to handle */
-LIST_HEAD(amd_iommu_unity_map); /* a list of required unity mappings
- we find in ACPI */
-bool amd_iommu_unmap_flush; /* if true, flush on every unmap */
-
-LIST_HEAD(amd_iommu_list); /* list of all AMD IOMMUs in the
- system */
-
-/* Array to assign indices to IOMMUs*/
-struct amd_iommu *amd_iommus[MAX_IOMMUS];
-int amd_iommus_present;
-
-/* IOMMUs have a non-present cache? */
-bool amd_iommu_np_cache __read_mostly;
-bool amd_iommu_iotlb_sup __read_mostly = true;
-
-/*
- * The ACPI table parsing functions set this variable on an error
- */
-static int __initdata amd_iommu_init_err;
-
-/*
- * List of protection domains - used during resume
- */
-LIST_HEAD(amd_iommu_pd_list);
-spinlock_t amd_iommu_pd_lock;
-
-/*
- * Pointer to the device table which is shared by all AMD IOMMUs
- * it is indexed by the PCI device id or the HT unit id and contains
- * information about the domain the device belongs to as well as the
- * page table root pointer.
- */
-struct dev_table_entry *amd_iommu_dev_table;
-
-/*
- * The alias table is a driver specific data structure which contains the
- * mappings of the PCI device ids to the actual requestor ids on the IOMMU.
- * More than one device can share the same requestor id.
- */
-u16 *amd_iommu_alias_table;
-
-/*
- * The rlookup table is used to find the IOMMU which is responsible
- * for a specific device. It is also indexed by the PCI device id.
- */
-struct amd_iommu **amd_iommu_rlookup_table;
-
-/*
- * AMD IOMMU allows up to 2^16 differend protection domains. This is a bitmap
- * to know which ones are already in use.
- */
-unsigned long *amd_iommu_pd_alloc_bitmap;
-
-static u32 dev_table_size; /* size of the device table */
-static u32 alias_table_size; /* size of the alias table */
-static u32 rlookup_table_size; /* size if the rlookup table */
-
-/*
- * This function flushes all internal caches of
- * the IOMMU used by this driver.
- */
-extern void iommu_flush_all_caches(struct amd_iommu *iommu);
-
-static inline void update_last_devid(u16 devid)
-{
- if (devid > amd_iommu_last_bdf)
- amd_iommu_last_bdf = devid;
-}
-
-static inline unsigned long tbl_size(int entry_size)
-{
- unsigned shift = PAGE_SHIFT +
- get_order(((int)amd_iommu_last_bdf + 1) * entry_size);
-
- return 1UL << shift;
-}
-
-/* Access to l1 and l2 indexed register spaces */
-
-static u32 iommu_read_l1(struct amd_iommu *iommu, u16 l1, u8 address)
-{
- u32 val;
-
- pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
- pci_read_config_dword(iommu->dev, 0xfc, &val);
- return val;
-}
-
-static void iommu_write_l1(struct amd_iommu *iommu, u16 l1, u8 address, u32 val)
-{
- pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16 | 1 << 31));
- pci_write_config_dword(iommu->dev, 0xfc, val);
- pci_write_config_dword(iommu->dev, 0xf8, (address | l1 << 16));
-}
-
-static u32 iommu_read_l2(struct amd_iommu *iommu, u8 address)
-{
- u32 val;
-
- pci_write_config_dword(iommu->dev, 0xf0, address);
- pci_read_config_dword(iommu->dev, 0xf4, &val);
- return val;
-}
-
-static void iommu_write_l2(struct amd_iommu *iommu, u8 address, u32 val)
-{
- pci_write_config_dword(iommu->dev, 0xf0, (address | 1 << 8));
- pci_write_config_dword(iommu->dev, 0xf4, val);
-}
-
-/****************************************************************************
- *
- * AMD IOMMU MMIO register space handling functions
- *
- * These functions are used to program the IOMMU device registers in
- * MMIO space required for that driver.
- *
- ****************************************************************************/
-
-/*
- * This function set the exclusion range in the IOMMU. DMA accesses to the
- * exclusion range are passed through untranslated
- */
-static void iommu_set_exclusion_range(struct amd_iommu *iommu)
-{
- u64 start = iommu->exclusion_start & PAGE_MASK;
- u64 limit = (start + iommu->exclusion_length) & PAGE_MASK;
- u64 entry;
-
- if (!iommu->exclusion_start)
- return;
-
- entry = start | MMIO_EXCL_ENABLE_MASK;
- memcpy_toio(iommu->mmio_base + MMIO_EXCL_BASE_OFFSET,
- &entry, sizeof(entry));
-
- entry = limit;
- memcpy_toio(iommu->mmio_base + MMIO_EXCL_LIMIT_OFFSET,
- &entry, sizeof(entry));
-}
-
-/* Programs the physical address of the device table into the IOMMU hardware */
-static void __init iommu_set_device_table(struct amd_iommu *iommu)
-{
- u64 entry;
-
- BUG_ON(iommu->mmio_base == NULL);
-
- entry = virt_to_phys(amd_iommu_dev_table);
- entry |= (dev_table_size >> 12) - 1;
- memcpy_toio(iommu->mmio_base + MMIO_DEV_TABLE_OFFSET,
- &entry, sizeof(entry));
-}
-
-/* Generic functions to enable/disable certain features of the IOMMU. */
-static void iommu_feature_enable(struct amd_iommu *iommu, u8 bit)
-{
- u32 ctrl;
-
- ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
- ctrl |= (1 << bit);
- writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
-}
-
-static void iommu_feature_disable(struct amd_iommu *iommu, u8 bit)
-{
- u32 ctrl;
-
- ctrl = readl(iommu->mmio_base + MMIO_CONTROL_OFFSET);
- ctrl &= ~(1 << bit);
- writel(ctrl, iommu->mmio_base + MMIO_CONTROL_OFFSET);
-}
-
-/* Function to enable the hardware */
-static void iommu_enable(struct amd_iommu *iommu)
-{
- static const char * const feat_str[] = {
- "PreF", "PPR", "X2APIC", "NX", "GT", "[5]",
- "IA", "GA", "HE", "PC", NULL
- };
- int i;
-
- printk(KERN_INFO "AMD-Vi: Enabling IOMMU at %s cap 0x%hx",
- dev_name(&iommu->dev->dev), iommu->cap_ptr);
-
- if (iommu->cap & (1 << IOMMU_CAP_EFR)) {
- printk(KERN_CONT " extended features: ");
- for (i = 0; feat_str[i]; ++i)
- if (iommu_feature(iommu, (1ULL << i)))
- printk(KERN_CONT " %s", feat_str[i]);
- }
- printk(KERN_CONT "\n");
-
- iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
-}
-
-static void iommu_disable(struct amd_iommu *iommu)
-{
- /* Disable command buffer */
- iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
-
- /* Disable event logging and event interrupts */
- iommu_feature_disable(iommu, CONTROL_EVT_INT_EN);
- iommu_feature_disable(iommu, CONTROL_EVT_LOG_EN);
-
- /* Disable IOMMU hardware itself */
- iommu_feature_disable(iommu, CONTROL_IOMMU_EN);
-}
-
-/*
- * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in
- * the system has one.
- */
-static u8 * __init iommu_map_mmio_space(u64 address)
-{
- u8 *ret;
-
- if (!request_mem_region(address, MMIO_REGION_LENGTH, "amd_iommu")) {
- pr_err("AMD-Vi: Can not reserve memory region %llx for mmio\n",
- address);
- pr_err("AMD-Vi: This is a BIOS bug. Please contact your hardware vendor\n");
- return NULL;
- }
-
- ret = ioremap_nocache(address, MMIO_REGION_LENGTH);
- if (ret != NULL)
- return ret;
-
- release_mem_region(address, MMIO_REGION_LENGTH);
-
- return NULL;
-}
-
-static void __init iommu_unmap_mmio_space(struct amd_iommu *iommu)
-{
- if (iommu->mmio_base)
- iounmap(iommu->mmio_base);
- release_mem_region(iommu->mmio_phys, MMIO_REGION_LENGTH);
-}
-
-/****************************************************************************
- *
- * The functions below belong to the first pass of AMD IOMMU ACPI table
- * parsing. In this pass we try to find out the highest device id this
- * code has to handle. Upon this information the size of the shared data
- * structures is determined later.
- *
- ****************************************************************************/
-
-/*
- * This function calculates the length of a given IVHD entry
- */
-static inline int ivhd_entry_length(u8 *ivhd)
-{
- return 0x04 << (*ivhd >> 6);
-}
-
-/*
- * This function reads the last device id the IOMMU has to handle from the PCI
- * capability header for this IOMMU
- */
-static int __init find_last_devid_on_pci(int bus, int dev, int fn, int cap_ptr)
-{
- u32 cap;
-
- cap = read_pci_config(bus, dev, fn, cap_ptr+MMIO_RANGE_OFFSET);
- update_last_devid(calc_devid(MMIO_GET_BUS(cap), MMIO_GET_LD(cap)));
-
- return 0;
-}
-
-/*
- * After reading the highest device id from the IOMMU PCI capability header
- * this function looks if there is a higher device id defined in the ACPI table
- */
-static int __init find_last_devid_from_ivhd(struct ivhd_header *h)
-{
- u8 *p = (void *)h, *end = (void *)h;
- struct ivhd_entry *dev;
-
- p += sizeof(*h);
- end += h->length;
-
- find_last_devid_on_pci(PCI_BUS(h->devid),
- PCI_SLOT(h->devid),
- PCI_FUNC(h->devid),
- h->cap_ptr);
-
- while (p < end) {
- dev = (struct ivhd_entry *)p;
- switch (dev->type) {
- case IVHD_DEV_SELECT:
- case IVHD_DEV_RANGE_END:
- case IVHD_DEV_ALIAS:
- case IVHD_DEV_EXT_SELECT:
- /* all the above subfield types refer to device ids */
- update_last_devid(dev->devid);
- break;
- default:
- break;
- }
- p += ivhd_entry_length(p);
- }
-
- WARN_ON(p != end);
-
- return 0;
-}
-
-/*
- * Iterate over all IVHD entries in the ACPI table and find the highest device
- * id which we need to handle. This is the first of three functions which parse
- * the ACPI table. So we check the checksum here.
- */
-static int __init find_last_devid_acpi(struct acpi_table_header *table)
-{
- int i;
- u8 checksum = 0, *p = (u8 *)table, *end = (u8 *)table;
- struct ivhd_header *h;
-
- /*
- * Validate checksum here so we don't need to do it when
- * we actually parse the table
- */
- for (i = 0; i < table->length; ++i)
- checksum += p[i];
- if (checksum != 0) {
- /* ACPI table corrupt */
- amd_iommu_init_err = -ENODEV;
- return 0;
- }
-
- p += IVRS_HEADER_LENGTH;
-
- end += table->length;
- while (p < end) {
- h = (struct ivhd_header *)p;
- switch (h->type) {
- case ACPI_IVHD_TYPE:
- find_last_devid_from_ivhd(h);
- break;
- default:
- break;
- }
- p += h->length;
- }
- WARN_ON(p != end);
-
- return 0;
-}
-
-/****************************************************************************
- *
- * The following functions belong the the code path which parses the ACPI table
- * the second time. In this ACPI parsing iteration we allocate IOMMU specific
- * data structures, initialize the device/alias/rlookup table and also
- * basically initialize the hardware.
- *
- ****************************************************************************/
-
-/*
- * Allocates the command buffer. This buffer is per AMD IOMMU. We can
- * write commands to that buffer later and the IOMMU will execute them
- * asynchronously
- */
-static u8 * __init alloc_command_buffer(struct amd_iommu *iommu)
-{
- u8 *cmd_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
- get_order(CMD_BUFFER_SIZE));
-
- if (cmd_buf == NULL)
- return NULL;
-
- iommu->cmd_buf_size = CMD_BUFFER_SIZE | CMD_BUFFER_UNINITIALIZED;
-
- return cmd_buf;
-}
-
-/*
- * This function resets the command buffer if the IOMMU stopped fetching
- * commands from it.
- */
-void amd_iommu_reset_cmd_buffer(struct amd_iommu *iommu)
-{
- iommu_feature_disable(iommu, CONTROL_CMDBUF_EN);
-
- writel(0x00, iommu->mmio_base + MMIO_CMD_HEAD_OFFSET);
- writel(0x00, iommu->mmio_base + MMIO_CMD_TAIL_OFFSET);
-
- iommu_feature_enable(iommu, CONTROL_CMDBUF_EN);
-}
-
-/*
- * This function writes the command buffer address to the hardware and
- * enables it.
- */
-static void iommu_enable_command_buffer(struct amd_iommu *iommu)
-{
- u64 entry;
-
- BUG_ON(iommu->cmd_buf == NULL);
-
- entry = (u64)virt_to_phys(iommu->cmd_buf);
- entry |= MMIO_CMD_SIZE_512;
-
- memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET,
- &entry, sizeof(entry));
-
- amd_iommu_reset_cmd_buffer(iommu);
- iommu->cmd_buf_size &= ~(CMD_BUFFER_UNINITIALIZED);
-}
-
-static void __init free_command_buffer(struct amd_iommu *iommu)
-{
- free_pages((unsigned long)iommu->cmd_buf,
- get_order(iommu->cmd_buf_size & ~(CMD_BUFFER_UNINITIALIZED)));
-}
-
-/* allocates the memory where the IOMMU will log its events to */
-static u8 * __init alloc_event_buffer(struct amd_iommu *iommu)
-{
- iommu->evt_buf = (u8 *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
- get_order(EVT_BUFFER_SIZE));
-
- if (iommu->evt_buf == NULL)
- return NULL;
-
- iommu->evt_buf_size = EVT_BUFFER_SIZE;
-
- return iommu->evt_buf;
-}
-
-static void iommu_enable_event_buffer(struct amd_iommu *iommu)
-{
- u64 entry;
-
- BUG_ON(iommu->evt_buf == NULL);
-
- entry = (u64)virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK;
-
- memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET,
- &entry, sizeof(entry));
-
- /* set head and tail to zero manually */
- writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);
- writel(0x00, iommu->mmio_base + MMIO_EVT_TAIL_OFFSET);
-
- iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
-}
-
-static void __init free_event_buffer(struct amd_iommu *iommu)
-{
- free_pages((unsigned long)iommu->evt_buf, get_order(EVT_BUFFER_SIZE));
-}
-
-/* sets a specific bit in the device table entry. */
-static void set_dev_entry_bit(u16 devid, u8 bit)
-{
- int i = (bit >> 5) & 0x07;
- int _bit = bit & 0x1f;
-
- amd_iommu_dev_table[devid].data[i] |= (1 << _bit);
-}
-
-static int get_dev_entry_bit(u16 devid, u8 bit)
-{
- int i = (bit >> 5) & 0x07;
- int _bit = bit & 0x1f;
-
- return (amd_iommu_dev_table[devid].data[i] & (1 << _bit)) >> _bit;
-}
-
-
-void amd_iommu_apply_erratum_63(u16 devid)
-{
- int sysmgt;
-
- sysmgt = get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1) |
- (get_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2) << 1);
-
- if (sysmgt == 0x01)
- set_dev_entry_bit(devid, DEV_ENTRY_IW);
-}
-
-/* Writes the specific IOMMU for a device into the rlookup table */
-static void __init set_iommu_for_device(struct amd_iommu *iommu, u16 devid)
-{
- amd_iommu_rlookup_table[devid] = iommu;
-}
-
-/*
- * This function takes the device specific flags read from the ACPI
- * table and sets up the device table entry with that information
- */
-static void __init set_dev_entry_from_acpi(struct amd_iommu *iommu,
- u16 devid, u32 flags, u32 ext_flags)
-{
- if (flags & ACPI_DEVFLAG_INITPASS)
- set_dev_entry_bit(devid, DEV_ENTRY_INIT_PASS);
- if (flags & ACPI_DEVFLAG_EXTINT)
- set_dev_entry_bit(devid, DEV_ENTRY_EINT_PASS);
- if (flags & ACPI_DEVFLAG_NMI)
- set_dev_entry_bit(devid, DEV_ENTRY_NMI_PASS);
- if (flags & ACPI_DEVFLAG_SYSMGT1)
- set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT1);
- if (flags & ACPI_DEVFLAG_SYSMGT2)
- set_dev_entry_bit(devid, DEV_ENTRY_SYSMGT2);
- if (flags & ACPI_DEVFLAG_LINT0)
- set_dev_entry_bit(devid, DEV_ENTRY_LINT0_PASS);
- if (flags & ACPI_DEVFLAG_LINT1)
- set_dev_entry_bit(devid, DEV_ENTRY_LINT1_PASS);
-
- amd_iommu_apply_erratum_63(devid);
-
- set_iommu_for_device(iommu, devid);
-}
-
-/*
- * Reads the device exclusion range from ACPI and initialize IOMMU with
- * it
- */
-static void __init set_device_exclusion_range(u16 devid, struct ivmd_header *m)
-{
- struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
-
- if (!(m->flags & IVMD_FLAG_EXCL_RANGE))
- return;
-
- if (iommu) {
- /*
- * We only can configure exclusion ranges per IOMMU, not
- * per device. But we can enable the exclusion range per
- * device. This is done here
- */
- set_dev_entry_bit(m->devid, DEV_ENTRY_EX);
- iommu->exclusion_start = m->range_start;
- iommu->exclusion_length = m->range_length;
- }
-}
-
-/*
- * This function reads some important data from the IOMMU PCI space and
- * initializes the driver data structure with it. It reads the hardware
- * capabilities and the first/last device entries
- */
-static void __init init_iommu_from_pci(struct amd_iommu *iommu)
-{
- int cap_ptr = iommu->cap_ptr;
- u32 range, misc, low, high;
- int i, j;
-
- pci_read_config_dword(iommu->dev, cap_ptr + MMIO_CAP_HDR_OFFSET,
- &iommu->cap);
- pci_read_config_dword(iommu->dev, cap_ptr + MMIO_RANGE_OFFSET,
- &range);
- pci_read_config_dword(iommu->dev, cap_ptr + MMIO_MISC_OFFSET,
- &misc);
-
- iommu->first_device = calc_devid(MMIO_GET_BUS(range),
- MMIO_GET_FD(range));
- iommu->last_device = calc_devid(MMIO_GET_BUS(range),
- MMIO_GET_LD(range));
- iommu->evt_msi_num = MMIO_MSI_NUM(misc);
-
- if (!(iommu->cap & (1 << IOMMU_CAP_IOTLB)))
- amd_iommu_iotlb_sup = false;
-
- /* read extended feature bits */
- low = readl(iommu->mmio_base + MMIO_EXT_FEATURES);
- high = readl(iommu->mmio_base + MMIO_EXT_FEATURES + 4);
-
- iommu->features = ((u64)high << 32) | low;
-
- if (!is_rd890_iommu(iommu->dev))
- return;
-
- /*
- * Some rd890 systems may not be fully reconfigured by the BIOS, so
- * it's necessary for us to store this information so it can be
- * reprogrammed on resume
- */
-
- pci_read_config_dword(iommu->dev, iommu->cap_ptr + 4,
- &iommu->stored_addr_lo);
- pci_read_config_dword(iommu->dev, iommu->cap_ptr + 8,
- &iommu->stored_addr_hi);
-
- /* Low bit locks writes to configuration space */
- iommu->stored_addr_lo &= ~1;
-
- for (i = 0; i < 6; i++)
- for (j = 0; j < 0x12; j++)
- iommu->stored_l1[i][j] = iommu_read_l1(iommu, i, j);
-
- for (i = 0; i < 0x83; i++)
- iommu->stored_l2[i] = iommu_read_l2(iommu, i);
-}
-
-/*
- * Takes a pointer to an AMD IOMMU entry in the ACPI table and
- * initializes the hardware and our data structures with it.
- */
-static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
- struct ivhd_header *h)
-{
- u8 *p = (u8 *)h;
- u8 *end = p, flags = 0;
- u16 devid = 0, devid_start = 0, devid_to = 0;
- u32 dev_i, ext_flags = 0;
- bool alias = false;
- struct ivhd_entry *e;
-
- /*
- * First save the recommended feature enable bits from ACPI
- */
- iommu->acpi_flags = h->flags;
-
- /*
- * Done. Now parse the device entries
- */
- p += sizeof(struct ivhd_header);
- end += h->length;
-
-
- while (p < end) {
- e = (struct ivhd_entry *)p;
- switch (e->type) {
- case IVHD_DEV_ALL:
-
- DUMP_printk(" DEV_ALL\t\t\t first devid: %02x:%02x.%x"
- " last device %02x:%02x.%x flags: %02x\n",
- PCI_BUS(iommu->first_device),
- PCI_SLOT(iommu->first_device),
- PCI_FUNC(iommu->first_device),
- PCI_BUS(iommu->last_device),
- PCI_SLOT(iommu->last_device),
- PCI_FUNC(iommu->last_device),
- e->flags);
-
- for (dev_i = iommu->first_device;
- dev_i <= iommu->last_device; ++dev_i)
- set_dev_entry_from_acpi(iommu, dev_i,
- e->flags, 0);
- break;
- case IVHD_DEV_SELECT:
-
- DUMP_printk(" DEV_SELECT\t\t\t devid: %02x:%02x.%x "
- "flags: %02x\n",
- PCI_BUS(e->devid),
- PCI_SLOT(e->devid),
- PCI_FUNC(e->devid),
- e->flags);
-
- devid = e->devid;
- set_dev_entry_from_acpi(iommu, devid, e->flags, 0);
- break;
- case IVHD_DEV_SELECT_RANGE_START:
-
- DUMP_printk(" DEV_SELECT_RANGE_START\t "
- "devid: %02x:%02x.%x flags: %02x\n",
- PCI_BUS(e->devid),
- PCI_SLOT(e->devid),
- PCI_FUNC(e->devid),
- e->flags);
-
- devid_start = e->devid;
- flags = e->flags;
- ext_flags = 0;
- alias = false;
- break;
- case IVHD_DEV_ALIAS:
-
- DUMP_printk(" DEV_ALIAS\t\t\t devid: %02x:%02x.%x "
- "flags: %02x devid_to: %02x:%02x.%x\n",
- PCI_BUS(e->devid),
- PCI_SLOT(e->devid),
- PCI_FUNC(e->devid),
- e->flags,
- PCI_BUS(e->ext >> 8),
- PCI_SLOT(e->ext >> 8),
- PCI_FUNC(e->ext >> 8));
-
- devid = e->devid;
- devid_to = e->ext >> 8;
- set_dev_entry_from_acpi(iommu, devid , e->flags, 0);
- set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0);
- amd_iommu_alias_table[devid] = devid_to;
- break;
- case IVHD_DEV_ALIAS_RANGE:
-
- DUMP_printk(" DEV_ALIAS_RANGE\t\t "
- "devid: %02x:%02x.%x flags: %02x "
- "devid_to: %02x:%02x.%x\n",
- PCI_BUS(e->devid),
- PCI_SLOT(e->devid),
- PCI_FUNC(e->devid),
- e->flags,
- PCI_BUS(e->ext >> 8),
- PCI_SLOT(e->ext >> 8),
- PCI_FUNC(e->ext >> 8));
-
- devid_start = e->devid;
- flags = e->flags;
- devid_to = e->ext >> 8;
- ext_flags = 0;
- alias = true;
- break;
- case IVHD_DEV_EXT_SELECT:
-
- DUMP_printk(" DEV_EXT_SELECT\t\t devid: %02x:%02x.%x "
- "flags: %02x ext: %08x\n",
- PCI_BUS(e->devid),
- PCI_SLOT(e->devid),
- PCI_FUNC(e->devid),
- e->flags, e->ext);
-
- devid = e->devid;
- set_dev_entry_from_acpi(iommu, devid, e->flags,
- e->ext);
- break;
- case IVHD_DEV_EXT_SELECT_RANGE:
-
- DUMP_printk(" DEV_EXT_SELECT_RANGE\t devid: "
- "%02x:%02x.%x flags: %02x ext: %08x\n",
- PCI_BUS(e->devid),
- PCI_SLOT(e->devid),
- PCI_FUNC(e->devid),
- e->flags, e->ext);
-
- devid_start = e->devid;
- flags = e->flags;
- ext_flags = e->ext;
- alias = false;
- break;
- case IVHD_DEV_RANGE_END:
-
- DUMP_printk(" DEV_RANGE_END\t\t devid: %02x:%02x.%x\n",
- PCI_BUS(e->devid),
- PCI_SLOT(e->devid),
- PCI_FUNC(e->devid));
-
- devid = e->devid;
- for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
- if (alias) {
- amd_iommu_alias_table[dev_i] = devid_to;
- set_dev_entry_from_acpi(iommu,
- devid_to, flags, ext_flags);
- }
- set_dev_entry_from_acpi(iommu, dev_i,
- flags, ext_flags);
- }
- break;
- default:
- break;
- }
-
- p += ivhd_entry_length(p);
- }
-}
-
-/* Initializes the device->iommu mapping for the driver */
-static int __init init_iommu_devices(struct amd_iommu *iommu)
-{
- u32 i;
-
- for (i = iommu->first_device; i <= iommu->last_device; ++i)
- set_iommu_for_device(iommu, i);
-
- return 0;
-}
-
-static void __init free_iommu_one(struct amd_iommu *iommu)
-{
- free_command_buffer(iommu);
- free_event_buffer(iommu);
- iommu_unmap_mmio_space(iommu);
-}
-
-static void __init free_iommu_all(void)
-{
- struct amd_iommu *iommu, *next;
-
- for_each_iommu_safe(iommu, next) {
- list_del(&iommu->list);
- free_iommu_one(iommu);
- kfree(iommu);
- }
-}
-
-/*
- * This function clues the initialization function for one IOMMU
- * together and also allocates the command buffer and programs the
- * hardware. It does NOT enable the IOMMU. This is done afterwards.
- */
-static int __init init_iommu_one(struct amd_iommu *iommu, struct ivhd_header *h)
-{
- spin_lock_init(&iommu->lock);
-
- /* Add IOMMU to internal data structures */
- list_add_tail(&iommu->list, &amd_iommu_list);
- iommu->index = amd_iommus_present++;
-
- if (unlikely(iommu->index >= MAX_IOMMUS)) {
- WARN(1, "AMD-Vi: System has more IOMMUs than supported by this driver\n");
- return -ENOSYS;
- }
-
- /* Index is fine - add IOMMU to the array */
- amd_iommus[iommu->index] = iommu;
-
- /*
- * Copy data from ACPI table entry to the iommu struct
- */
- iommu->dev = pci_get_bus_and_slot(PCI_BUS(h->devid), h->devid & 0xff);
- if (!iommu->dev)
- return 1;
-
- iommu->cap_ptr = h->cap_ptr;
- iommu->pci_seg = h->pci_seg;
- iommu->mmio_phys = h->mmio_phys;
- iommu->mmio_base = iommu_map_mmio_space(h->mmio_phys);
- if (!iommu->mmio_base)
- return -ENOMEM;
-
- iommu->cmd_buf = alloc_command_buffer(iommu);
- if (!iommu->cmd_buf)
- return -ENOMEM;
-
- iommu->evt_buf = alloc_event_buffer(iommu);
- if (!iommu->evt_buf)
- return -ENOMEM;
-
- iommu->int_enabled = false;
-
- init_iommu_from_pci(iommu);
- init_iommu_from_acpi(iommu, h);
- init_iommu_devices(iommu);
-
- if (iommu->cap & (1UL << IOMMU_CAP_NPCACHE))
- amd_iommu_np_cache = true;
-
- return pci_enable_device(iommu->dev);
-}
-
-/*
- * Iterates over all IOMMU entries in the ACPI table, allocates the
- * IOMMU structure and initializes it with init_iommu_one()
- */
-static int __init init_iommu_all(struct acpi_table_header *table)
-{
- u8 *p = (u8 *)table, *end = (u8 *)table;
- struct ivhd_header *h;
- struct amd_iommu *iommu;
- int ret;
-
- end += table->length;
- p += IVRS_HEADER_LENGTH;
-
- while (p < end) {
- h = (struct ivhd_header *)p;
- switch (*p) {
- case ACPI_IVHD_TYPE:
-
- DUMP_printk("device: %02x:%02x.%01x cap: %04x "
- "seg: %d flags: %01x info %04x\n",
- PCI_BUS(h->devid), PCI_SLOT(h->devid),
- PCI_FUNC(h->devid), h->cap_ptr,
- h->pci_seg, h->flags, h->info);
- DUMP_printk(" mmio-addr: %016llx\n",
- h->mmio_phys);
-
- iommu = kzalloc(sizeof(struct amd_iommu), GFP_KERNEL);
- if (iommu == NULL) {
- amd_iommu_init_err = -ENOMEM;
- return 0;
- }
-
- ret = init_iommu_one(iommu, h);
- if (ret) {
- amd_iommu_init_err = ret;
- return 0;
- }
- break;
- default:
- break;
- }
- p += h->length;
-
- }
- WARN_ON(p != end);
-
- return 0;
-}
-
-/****************************************************************************
- *
- * The following functions initialize the MSI interrupts for all IOMMUs
- * in the system. Its a bit challenging because there could be multiple
- * IOMMUs per PCI BDF but we can call pci_enable_msi(x) only once per
- * pci_dev.
- *
- ****************************************************************************/
-
-static int iommu_setup_msi(struct amd_iommu *iommu)
-{
- int r;
-
- if (pci_enable_msi(iommu->dev))
- return 1;
-
- r = request_threaded_irq(iommu->dev->irq,
- amd_iommu_int_handler,
- amd_iommu_int_thread,
- 0, "AMD-Vi",
- iommu->dev);
-
- if (r) {
- pci_disable_msi(iommu->dev);
- return 1;
- }
-
- iommu->int_enabled = true;
- iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
-
- return 0;
-}
-
-static int iommu_init_msi(struct amd_iommu *iommu)
-{
- if (iommu->int_enabled)
- return 0;
-
- if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI))
- return iommu_setup_msi(iommu);
-
- return 1;
-}
-
-/****************************************************************************
- *
- * The next functions belong to the third pass of parsing the ACPI
- * table. In this last pass the memory mapping requirements are
- * gathered (like exclusion and unity mapping reanges).
- *
- ****************************************************************************/
-
-static void __init free_unity_maps(void)
-{
- struct unity_map_entry *entry, *next;
-
- list_for_each_entry_safe(entry, next, &amd_iommu_unity_map, list) {
- list_del(&entry->list);
- kfree(entry);
- }
-}
-
-/* called when we find an exclusion range definition in ACPI */
-static int __init init_exclusion_range(struct ivmd_header *m)
-{
- int i;
-
- switch (m->type) {
- case ACPI_IVMD_TYPE:
- set_device_exclusion_range(m->devid, m);
- break;
- case ACPI_IVMD_TYPE_ALL:
- for (i = 0; i <= amd_iommu_last_bdf; ++i)
- set_device_exclusion_range(i, m);
- break;
- case ACPI_IVMD_TYPE_RANGE:
- for (i = m->devid; i <= m->aux; ++i)
- set_device_exclusion_range(i, m);
- break;
- default:
- break;
- }
-
- return 0;
-}
-
-/* called for unity map ACPI definition */
-static int __init init_unity_map_range(struct ivmd_header *m)
-{
- struct unity_map_entry *e = 0;
- char *s;
-
- e = kzalloc(sizeof(*e), GFP_KERNEL);
- if (e == NULL)
- return -ENOMEM;
-
- switch (m->type) {
- default:
- kfree(e);
- return 0;
- case ACPI_IVMD_TYPE:
- s = "IVMD_TYPEi\t\t\t";
- e->devid_start = e->devid_end = m->devid;
- break;
- case ACPI_IVMD_TYPE_ALL:
- s = "IVMD_TYPE_ALL\t\t";
- e->devid_start = 0;
- e->devid_end = amd_iommu_last_bdf;
- break;
- case ACPI_IVMD_TYPE_RANGE:
- s = "IVMD_TYPE_RANGE\t\t";
- e->devid_start = m->devid;
- e->devid_end = m->aux;
- break;
- }
- e->address_start = PAGE_ALIGN(m->range_start);
- e->address_end = e->address_start + PAGE_ALIGN(m->range_length);
- e->prot = m->flags >> 1;
-
- DUMP_printk("%s devid_start: %02x:%02x.%x devid_end: %02x:%02x.%x"
- " range_start: %016llx range_end: %016llx flags: %x\n", s,
- PCI_BUS(e->devid_start), PCI_SLOT(e->devid_start),
- PCI_FUNC(e->devid_start), PCI_BUS(e->devid_end),
- PCI_SLOT(e->devid_end), PCI_FUNC(e->devid_end),
- e->address_start, e->address_end, m->flags);
-
- list_add_tail(&e->list, &amd_iommu_unity_map);
-
- return 0;
-}
-
-/* iterates over all memory definitions we find in the ACPI table */
-static int __init init_memory_definitions(struct acpi_table_header *table)
-{
- u8 *p = (u8 *)table, *end = (u8 *)table;
- struct ivmd_header *m;
-
- end += table->length;
- p += IVRS_HEADER_LENGTH;
-
- while (p < end) {
- m = (struct ivmd_header *)p;
- if (m->flags & IVMD_FLAG_EXCL_RANGE)
- init_exclusion_range(m);
- else if (m->flags & IVMD_FLAG_UNITY_MAP)
- init_unity_map_range(m);
-
- p += m->length;
- }
-
- return 0;
-}
-
-/*
- * Init the device table to not allow DMA access for devices and
- * suppress all page faults
- */
-static void init_device_table(void)
-{
- u32 devid;
-
- for (devid = 0; devid <= amd_iommu_last_bdf; ++devid) {
- set_dev_entry_bit(devid, DEV_ENTRY_VALID);
- set_dev_entry_bit(devid, DEV_ENTRY_TRANSLATION);
- }
-}
-
-static void iommu_init_flags(struct amd_iommu *iommu)
-{
- iommu->acpi_flags & IVHD_FLAG_HT_TUN_EN_MASK ?
- iommu_feature_enable(iommu, CONTROL_HT_TUN_EN) :
- iommu_feature_disable(iommu, CONTROL_HT_TUN_EN);
-
- iommu->acpi_flags & IVHD_FLAG_PASSPW_EN_MASK ?
- iommu_feature_enable(iommu, CONTROL_PASSPW_EN) :
- iommu_feature_disable(iommu, CONTROL_PASSPW_EN);
-
- iommu->acpi_flags & IVHD_FLAG_RESPASSPW_EN_MASK ?
- iommu_feature_enable(iommu, CONTROL_RESPASSPW_EN) :
- iommu_feature_disable(iommu, CONTROL_RESPASSPW_EN);
-
- iommu->acpi_flags & IVHD_FLAG_ISOC_EN_MASK ?
- iommu_feature_enable(iommu, CONTROL_ISOC_EN) :
- iommu_feature_disable(iommu, CONTROL_ISOC_EN);
-
- /*
- * make IOMMU memory accesses cache coherent
- */
- iommu_feature_enable(iommu, CONTROL_COHERENT_EN);
-}
-
-static void iommu_apply_resume_quirks(struct amd_iommu *iommu)
-{
- int i, j;
- u32 ioc_feature_control;
- struct pci_dev *pdev = NULL;
-
- /* RD890 BIOSes may not have completely reconfigured the iommu */
- if (!is_rd890_iommu(iommu->dev))
- return;
-
- /*
- * First, we need to ensure that the iommu is enabled. This is
- * controlled by a register in the northbridge
- */
- pdev = pci_get_bus_and_slot(iommu->dev->bus->number, PCI_DEVFN(0, 0));
-
- if (!pdev)
- return;
-
- /* Select Northbridge indirect register 0x75 and enable writing */
- pci_write_config_dword(pdev, 0x60, 0x75 | (1 << 7));
- pci_read_config_dword(pdev, 0x64, &ioc_feature_control);
-
- /* Enable the iommu */
- if (!(ioc_feature_control & 0x1))
- pci_write_config_dword(pdev, 0x64, ioc_feature_control | 1);
-
- pci_dev_put(pdev);
-
- /* Restore the iommu BAR */
- pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
- iommu->stored_addr_lo);
- pci_write_config_dword(iommu->dev, iommu->cap_ptr + 8,
- iommu->stored_addr_hi);
-
- /* Restore the l1 indirect regs for each of the 6 l1s */
- for (i = 0; i < 6; i++)
- for (j = 0; j < 0x12; j++)
- iommu_write_l1(iommu, i, j, iommu->stored_l1[i][j]);
-
- /* Restore the l2 indirect regs */
- for (i = 0; i < 0x83; i++)
- iommu_write_l2(iommu, i, iommu->stored_l2[i]);
-
- /* Lock PCI setup registers */
- pci_write_config_dword(iommu->dev, iommu->cap_ptr + 4,
- iommu->stored_addr_lo | 1);
-}
-
-/*
- * This function finally enables all IOMMUs found in the system after
- * they have been initialized
- */
-static void enable_iommus(void)
-{
- struct amd_iommu *iommu;
-
- for_each_iommu(iommu) {
- iommu_disable(iommu);
- iommu_init_flags(iommu);
- iommu_set_device_table(iommu);
- iommu_enable_command_buffer(iommu);
- iommu_enable_event_buffer(iommu);
- iommu_set_exclusion_range(iommu);
- iommu_init_msi(iommu);
- iommu_enable(iommu);
- iommu_flush_all_caches(iommu);
- }
-}
-
-static void disable_iommus(void)
-{
- struct amd_iommu *iommu;
-
- for_each_iommu(iommu)
- iommu_disable(iommu);
-}
-
-/*
- * Suspend/Resume support
- * disable suspend until real resume implemented
- */
-
-static void amd_iommu_resume(void)
-{
- struct amd_iommu *iommu;
-
- for_each_iommu(iommu)
- iommu_apply_resume_quirks(iommu);
-
- /* re-load the hardware */
- enable_iommus();
-
- /*
- * we have to flush after the IOMMUs are enabled because a
- * disabled IOMMU will never execute the commands we send
- */
- for_each_iommu(iommu)
- iommu_flush_all_caches(iommu);
-}
-
-static int amd_iommu_suspend(void)
-{
- /* disable IOMMUs to go out of the way for BIOS */
- disable_iommus();
-
- return 0;
-}
-
-static struct syscore_ops amd_iommu_syscore_ops = {
- .suspend = amd_iommu_suspend,
- .resume = amd_iommu_resume,
-};
-
-/*
- * This is the core init function for AMD IOMMU hardware in the system.
- * This function is called from the generic x86 DMA layer initialization
- * code.
- *
- * This function basically parses the ACPI table for AMD IOMMU (IVRS)
- * three times:
- *
- * 1 pass) Find the highest PCI device id the driver has to handle.
- * Upon this information the size of the data structures is
- * determined that needs to be allocated.
- *
- * 2 pass) Initialize the data structures just allocated with the
- * information in the ACPI table about available AMD IOMMUs
- * in the system. It also maps the PCI devices in the
- * system to specific IOMMUs
- *
- * 3 pass) After the basic data structures are allocated and
- * initialized we update them with information about memory
- * remapping requirements parsed out of the ACPI table in
- * this last pass.
- *
- * After that the hardware is initialized and ready to go. In the last
- * step we do some Linux specific things like registering the driver in
- * the dma_ops interface and initializing the suspend/resume support
- * functions. Finally it prints some information about AMD IOMMUs and
- * the driver state and enables the hardware.
- */
-static int __init amd_iommu_init(void)
-{
- int i, ret = 0;
-
- /*
- * First parse ACPI tables to find the largest Bus/Dev/Func
- * we need to handle. Upon this information the shared data
- * structures for the IOMMUs in the system will be allocated
- */
- if (acpi_table_parse("IVRS", find_last_devid_acpi) != 0)
- return -ENODEV;
-
- ret = amd_iommu_init_err;
- if (ret)
- goto out;
-
- dev_table_size = tbl_size(DEV_TABLE_ENTRY_SIZE);
- alias_table_size = tbl_size(ALIAS_TABLE_ENTRY_SIZE);
- rlookup_table_size = tbl_size(RLOOKUP_TABLE_ENTRY_SIZE);
-
- ret = -ENOMEM;
-
- /* Device table - directly used by all IOMMUs */
- amd_iommu_dev_table = (void *)__get_free_pages(GFP_KERNEL | __GFP_ZERO,
- get_order(dev_table_size));
- if (amd_iommu_dev_table == NULL)
- goto out;
-
- /*
- * Alias table - map PCI Bus/Dev/Func to Bus/Dev/Func the
- * IOMMU see for that device
- */
- amd_iommu_alias_table = (void *)__get_free_pages(GFP_KERNEL,
- get_order(alias_table_size));
- if (amd_iommu_alias_table == NULL)
- goto free;
-
- /* IOMMU rlookup table - find the IOMMU for a specific device */
- amd_iommu_rlookup_table = (void *)__get_free_pages(
- GFP_KERNEL | __GFP_ZERO,
- get_order(rlookup_table_size));
- if (amd_iommu_rlookup_table == NULL)
- goto free;
-
- amd_iommu_pd_alloc_bitmap = (void *)__get_free_pages(
- GFP_KERNEL | __GFP_ZERO,
- get_order(MAX_DOMAIN_ID/8));
- if (amd_iommu_pd_alloc_bitmap == NULL)
- goto free;
-
- /* init the device table */
- init_device_table();
-
- /*
- * let all alias entries point to itself
- */
- for (i = 0; i <= amd_iommu_last_bdf; ++i)
- amd_iommu_alias_table[i] = i;
-
- /*
- * never allocate domain 0 because its used as the non-allocated and
- * error value placeholder
- */
- amd_iommu_pd_alloc_bitmap[0] = 1;
-
- spin_lock_init(&amd_iommu_pd_lock);
-
- /*
- * now the data structures are allocated and basically initialized
- * start the real acpi table scan
- */
- ret = -ENODEV;
- if (acpi_table_parse("IVRS", init_iommu_all) != 0)
- goto free;
-
- if (amd_iommu_init_err) {
- ret = amd_iommu_init_err;
- goto free;
- }
-
- if (acpi_table_parse("IVRS", init_memory_definitions) != 0)
- goto free;
-
- if (amd_iommu_init_err) {
- ret = amd_iommu_init_err;
- goto free;
- }
-
- ret = amd_iommu_init_devices();
- if (ret)
- goto free;
-
- enable_iommus();
-
- if (iommu_pass_through)
- ret = amd_iommu_init_passthrough();
- else
- ret = amd_iommu_init_dma_ops();
-
- if (ret)
- goto free_disable;
-
- amd_iommu_init_api();
-
- amd_iommu_init_notifier();
-
- register_syscore_ops(&amd_iommu_syscore_ops);
-
- if (iommu_pass_through)
- goto out;
-
- if (amd_iommu_unmap_flush)
- printk(KERN_INFO "AMD-Vi: IO/TLB flush on unmap enabled\n");
- else
- printk(KERN_INFO "AMD-Vi: Lazy IO/TLB flushing enabled\n");
-
- x86_platform.iommu_shutdown = disable_iommus;
-out:
- return ret;
-
-free_disable:
- disable_iommus();
-
-free:
- amd_iommu_uninit_devices();
-
- free_pages((unsigned long)amd_iommu_pd_alloc_bitmap,
- get_order(MAX_DOMAIN_ID/8));
-
- free_pages((unsigned long)amd_iommu_rlookup_table,
- get_order(rlookup_table_size));
-
- free_pages((unsigned long)amd_iommu_alias_table,
- get_order(alias_table_size));
-
- free_pages((unsigned long)amd_iommu_dev_table,
- get_order(dev_table_size));
-
- free_iommu_all();
-
- free_unity_maps();
-
-#ifdef CONFIG_GART_IOMMU
- /*
- * We failed to initialize the AMD IOMMU - try fallback to GART
- * if possible.
- */
- gart_iommu_init();
-
-#endif
-
- goto out;
-}
-
-/****************************************************************************
- *
- * Early detect code. This code runs at IOMMU detection time in the DMA
- * layer. It just looks if there is an IVRS ACPI table to detect AMD
- * IOMMUs
- *
- ****************************************************************************/
-static int __init early_amd_iommu_detect(struct acpi_table_header *table)
-{
- return 0;
-}
-
-int __init amd_iommu_detect(void)
-{
- if (no_iommu || (iommu_detected && !gart_iommu_aperture))
- return -ENODEV;
-
- if (amd_iommu_disabled)
- return -ENODEV;
-
- if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
- iommu_detected = 1;
- amd_iommu_detected = 1;
- x86_init.iommu.iommu_init = amd_iommu_init;
-
- /* Make sure ACS will be enabled */
- pci_request_acs();
- return 1;
- }
- return -ENODEV;
-}
-
-/****************************************************************************
- *
- * Parsing functions for the AMD IOMMU specific kernel command line
- * options.
- *
- ****************************************************************************/
-
-static int __init parse_amd_iommu_dump(char *str)
-{
- amd_iommu_dump = true;
-
- return 1;
-}
-
-static int __init parse_amd_iommu_options(char *str)
-{
- for (; *str; ++str) {
- if (strncmp(str, "fullflush", 9) == 0)
- amd_iommu_unmap_flush = true;
- if (strncmp(str, "off", 3) == 0)
- amd_iommu_disabled = true;
- }
-
- return 1;
-}
-
-__setup("amd_iommu_dump", parse_amd_iommu_dump);
-__setup("amd_iommu=", parse_amd_iommu_options);
-
-IOMMU_INIT_FINISH(amd_iommu_detect,
- gart_iommu_hole_init,
- 0,
- 0);