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Diffstat (limited to 'drivers/iommu/amd_iommu_init.c')
-rw-r--r--drivers/iommu/amd_iommu_init.c1574
1 files changed, 1574 insertions, 0 deletions
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
new file mode 100644
index 000000000000..82d2410f4205
--- /dev/null
+++ b/drivers/iommu/amd_iommu_init.c
@@ -0,0 +1,1574 @@
+/*
+ * 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 <linux/amd-iommu.h>
+#include <asm/pci-direct.h>
+#include <asm/iommu.h>
+#include <asm/gart.h>
+#include <asm/x86_init.h>
+#include <asm/iommu_table.h>
+
+#include "amd_iommu_proto.h"
+#include "amd_iommu_types.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);