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dmar.c
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dmar.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2006, Intel Corporation.
*
* Copyright (C) 2006-2008 Intel Corporation
* Author: Ashok Raj <ashok.raj@intel.com>
* Author: Shaohua Li <shaohua.li@intel.com>
* Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
*
* This file implements early detection/parsing of Remapping Devices
* reported to OS through BIOS via DMA remapping reporting (DMAR) ACPI
* tables.
*
* These routines are used by both DMA-remapping and Interrupt-remapping
*/
#define pr_fmt(fmt) "DMAR: " fmt
#include <linux/pci.h>
#include <linux/dmar.h>
#include <linux/iova.h>
#include <linux/intel-iommu.h>
#include <linux/timer.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/tboot.h>
#include <linux/dmi.h>
#include <linux/slab.h>
#include <linux/iommu.h>
#include <linux/numa.h>
#include <linux/limits.h>
#include <asm/irq_remapping.h>
#include <asm/iommu_table.h>
#include <trace/events/intel_iommu.h>
#include "../irq_remapping.h"
#include "perf.h"
typedef int (*dmar_res_handler_t)(struct acpi_dmar_header *, void *);
struct dmar_res_callback {
dmar_res_handler_t cb[ACPI_DMAR_TYPE_RESERVED];
void *arg[ACPI_DMAR_TYPE_RESERVED];
bool ignore_unhandled;
bool print_entry;
};
/*
* Assumptions:
* 1) The hotplug framework guarentees that DMAR unit will be hot-added
* before IO devices managed by that unit.
* 2) The hotplug framework guarantees that DMAR unit will be hot-removed
* after IO devices managed by that unit.
* 3) Hotplug events are rare.
*
* Locking rules for DMA and interrupt remapping related global data structures:
* 1) Use dmar_global_lock in process context
* 2) Use RCU in interrupt context
*/
DECLARE_RWSEM(dmar_global_lock);
LIST_HEAD(dmar_drhd_units);
struct acpi_table_header * __initdata dmar_tbl;
static int dmar_dev_scope_status = 1;
static unsigned long dmar_seq_ids[BITS_TO_LONGS(DMAR_UNITS_SUPPORTED)];
static int alloc_iommu(struct dmar_drhd_unit *drhd);
static void free_iommu(struct intel_iommu *iommu);
extern const struct iommu_ops intel_iommu_ops;
static void dmar_register_drhd_unit(struct dmar_drhd_unit *drhd)
{
/*
* add INCLUDE_ALL at the tail, so scan the list will find it at
* the very end.
*/
if (drhd->include_all)
list_add_tail_rcu(&drhd->list, &dmar_drhd_units);
else
list_add_rcu(&drhd->list, &dmar_drhd_units);
}
void *dmar_alloc_dev_scope(void *start, void *end, int *cnt)
{
struct acpi_dmar_device_scope *scope;
*cnt = 0;
while (start < end) {
scope = start;
if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_NAMESPACE ||
scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT ||
scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE)
(*cnt)++;
else if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_IOAPIC &&
scope->entry_type != ACPI_DMAR_SCOPE_TYPE_HPET) {
pr_warn("Unsupported device scope\n");
}
start += scope->length;
}
if (*cnt == 0)
return NULL;
return kcalloc(*cnt, sizeof(struct dmar_dev_scope), GFP_KERNEL);
}
void dmar_free_dev_scope(struct dmar_dev_scope **devices, int *cnt)
{
int i;
struct device *tmp_dev;
if (*devices && *cnt) {
for_each_active_dev_scope(*devices, *cnt, i, tmp_dev)
put_device(tmp_dev);
kfree(*devices);
}
*devices = NULL;
*cnt = 0;
}
/* Optimize out kzalloc()/kfree() for normal cases */
static char dmar_pci_notify_info_buf[64];
static struct dmar_pci_notify_info *
dmar_alloc_pci_notify_info(struct pci_dev *dev, unsigned long event)
{
int level = 0;
size_t size;
struct pci_dev *tmp;
struct dmar_pci_notify_info *info;
BUG_ON(dev->is_virtfn);
/*
* Ignore devices that have a domain number higher than what can
* be looked up in DMAR, e.g. VMD subdevices with domain 0x10000
*/
if (pci_domain_nr(dev->bus) > U16_MAX)
return NULL;
/* Only generate path[] for device addition event */
if (event == BUS_NOTIFY_ADD_DEVICE)
for (tmp = dev; tmp; tmp = tmp->bus->self)
level++;
size = struct_size(info, path, level);
if (size <= sizeof(dmar_pci_notify_info_buf)) {
info = (struct dmar_pci_notify_info *)dmar_pci_notify_info_buf;
} else {
info = kzalloc(size, GFP_KERNEL);
if (!info) {
if (dmar_dev_scope_status == 0)
dmar_dev_scope_status = -ENOMEM;
return NULL;
}
}
info->event = event;
info->dev = dev;
info->seg = pci_domain_nr(dev->bus);
info->level = level;
if (event == BUS_NOTIFY_ADD_DEVICE) {
for (tmp = dev; tmp; tmp = tmp->bus->self) {
level--;
info->path[level].bus = tmp->bus->number;
info->path[level].device = PCI_SLOT(tmp->devfn);
info->path[level].function = PCI_FUNC(tmp->devfn);
if (pci_is_root_bus(tmp->bus))
info->bus = tmp->bus->number;
}
}
return info;
}
static inline void dmar_free_pci_notify_info(struct dmar_pci_notify_info *info)
{
if ((void *)info != dmar_pci_notify_info_buf)
kfree(info);
}
static bool dmar_match_pci_path(struct dmar_pci_notify_info *info, int bus,
struct acpi_dmar_pci_path *path, int count)
{
int i;
if (info->bus != bus)
goto fallback;
if (info->level != count)
goto fallback;
for (i = 0; i < count; i++) {
if (path[i].device != info->path[i].device ||
path[i].function != info->path[i].function)
goto fallback;
}
return true;
fallback:
if (count != 1)
return false;
i = info->level - 1;
if (bus == info->path[i].bus &&
path[0].device == info->path[i].device &&
path[0].function == info->path[i].function) {
pr_info(FW_BUG "RMRR entry for device %02x:%02x.%x is broken - applying workaround\n",
bus, path[0].device, path[0].function);
return true;
}
return false;
}
/* Return: > 0 if match found, 0 if no match found, < 0 if error happens */
int dmar_insert_dev_scope(struct dmar_pci_notify_info *info,
void *start, void*end, u16 segment,
struct dmar_dev_scope *devices,
int devices_cnt)
{
int i, level;
struct device *tmp, *dev = &info->dev->dev;
struct acpi_dmar_device_scope *scope;
struct acpi_dmar_pci_path *path;
if (segment != info->seg)
return 0;
for (; start < end; start += scope->length) {
scope = start;
if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_ENDPOINT &&
scope->entry_type != ACPI_DMAR_SCOPE_TYPE_BRIDGE)
continue;
path = (struct acpi_dmar_pci_path *)(scope + 1);
level = (scope->length - sizeof(*scope)) / sizeof(*path);
if (!dmar_match_pci_path(info, scope->bus, path, level))
continue;
/*
* We expect devices with endpoint scope to have normal PCI
* headers, and devices with bridge scope to have bridge PCI
* headers. However PCI NTB devices may be listed in the
* DMAR table with bridge scope, even though they have a
* normal PCI header. NTB devices are identified by class
* "BRIDGE_OTHER" (0680h) - we don't declare a socpe mismatch
* for this special case.
*/
if ((scope->entry_type == ACPI_DMAR_SCOPE_TYPE_ENDPOINT &&
info->dev->hdr_type != PCI_HEADER_TYPE_NORMAL) ||
(scope->entry_type == ACPI_DMAR_SCOPE_TYPE_BRIDGE &&
(info->dev->hdr_type == PCI_HEADER_TYPE_NORMAL &&
info->dev->class >> 16 != PCI_BASE_CLASS_BRIDGE))) {
pr_warn("Device scope type does not match for %s\n",
pci_name(info->dev));
return -EINVAL;
}
for_each_dev_scope(devices, devices_cnt, i, tmp)
if (tmp == NULL) {
devices[i].bus = info->dev->bus->number;
devices[i].devfn = info->dev->devfn;
rcu_assign_pointer(devices[i].dev,
get_device(dev));
return 1;
}
BUG_ON(i >= devices_cnt);
}
return 0;
}
int dmar_remove_dev_scope(struct dmar_pci_notify_info *info, u16 segment,
struct dmar_dev_scope *devices, int count)
{
int index;
struct device *tmp;
if (info->seg != segment)
return 0;
for_each_active_dev_scope(devices, count, index, tmp)
if (tmp == &info->dev->dev) {
RCU_INIT_POINTER(devices[index].dev, NULL);
synchronize_rcu();
put_device(tmp);
return 1;
}
return 0;
}
static int dmar_pci_bus_add_dev(struct dmar_pci_notify_info *info)
{
int ret = 0;
struct dmar_drhd_unit *dmaru;
struct acpi_dmar_hardware_unit *drhd;
for_each_drhd_unit(dmaru) {
if (dmaru->include_all)
continue;
drhd = container_of(dmaru->hdr,
struct acpi_dmar_hardware_unit, header);
ret = dmar_insert_dev_scope(info, (void *)(drhd + 1),
((void *)drhd) + drhd->header.length,
dmaru->segment,
dmaru->devices, dmaru->devices_cnt);
if (ret)
break;
}
if (ret >= 0)
ret = dmar_iommu_notify_scope_dev(info);
if (ret < 0 && dmar_dev_scope_status == 0)
dmar_dev_scope_status = ret;
if (ret >= 0)
intel_irq_remap_add_device(info);
return ret;
}
static void dmar_pci_bus_del_dev(struct dmar_pci_notify_info *info)
{
struct dmar_drhd_unit *dmaru;
for_each_drhd_unit(dmaru)
if (dmar_remove_dev_scope(info, dmaru->segment,
dmaru->devices, dmaru->devices_cnt))
break;
dmar_iommu_notify_scope_dev(info);
}
static inline void vf_inherit_msi_domain(struct pci_dev *pdev)
{
struct pci_dev *physfn = pci_physfn(pdev);
dev_set_msi_domain(&pdev->dev, dev_get_msi_domain(&physfn->dev));
}
static int dmar_pci_bus_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
struct pci_dev *pdev = to_pci_dev(data);
struct dmar_pci_notify_info *info;
/* Only care about add/remove events for physical functions.
* For VFs we actually do the lookup based on the corresponding
* PF in device_to_iommu() anyway. */
if (pdev->is_virtfn) {
/*
* Ensure that the VF device inherits the irq domain of the
* PF device. Ideally the device would inherit the domain
* from the bus, but DMAR can have multiple units per bus
* which makes this impossible. The VF 'bus' could inherit
* from the PF device, but that's yet another x86'sism to
* inflict on everybody else.
*/
if (action == BUS_NOTIFY_ADD_DEVICE)
vf_inherit_msi_domain(pdev);
return NOTIFY_DONE;
}
if (action != BUS_NOTIFY_ADD_DEVICE &&
action != BUS_NOTIFY_REMOVED_DEVICE)
return NOTIFY_DONE;
info = dmar_alloc_pci_notify_info(pdev, action);
if (!info)
return NOTIFY_DONE;
down_write(&dmar_global_lock);
if (action == BUS_NOTIFY_ADD_DEVICE)
dmar_pci_bus_add_dev(info);
else if (action == BUS_NOTIFY_REMOVED_DEVICE)
dmar_pci_bus_del_dev(info);
up_write(&dmar_global_lock);
dmar_free_pci_notify_info(info);
return NOTIFY_OK;
}
static struct notifier_block dmar_pci_bus_nb = {
.notifier_call = dmar_pci_bus_notifier,
.priority = 1,
};
static struct dmar_drhd_unit *
dmar_find_dmaru(struct acpi_dmar_hardware_unit *drhd)
{
struct dmar_drhd_unit *dmaru;
list_for_each_entry_rcu(dmaru, &dmar_drhd_units, list,
dmar_rcu_check())
if (dmaru->segment == drhd->segment &&
dmaru->reg_base_addr == drhd->address)
return dmaru;
return NULL;
}
/*
* dmar_parse_one_drhd - parses exactly one DMA remapping hardware definition
* structure which uniquely represent one DMA remapping hardware unit
* present in the platform
*/
static int dmar_parse_one_drhd(struct acpi_dmar_header *header, void *arg)
{
struct acpi_dmar_hardware_unit *drhd;
struct dmar_drhd_unit *dmaru;
int ret;
drhd = (struct acpi_dmar_hardware_unit *)header;
dmaru = dmar_find_dmaru(drhd);
if (dmaru)
goto out;
dmaru = kzalloc(sizeof(*dmaru) + header->length, GFP_KERNEL);
if (!dmaru)
return -ENOMEM;
/*
* If header is allocated from slab by ACPI _DSM method, we need to
* copy the content because the memory buffer will be freed on return.
*/
dmaru->hdr = (void *)(dmaru + 1);
memcpy(dmaru->hdr, header, header->length);
dmaru->reg_base_addr = drhd->address;
dmaru->segment = drhd->segment;
dmaru->include_all = drhd->flags & 0x1; /* BIT0: INCLUDE_ALL */
dmaru->devices = dmar_alloc_dev_scope((void *)(drhd + 1),
((void *)drhd) + drhd->header.length,
&dmaru->devices_cnt);
if (dmaru->devices_cnt && dmaru->devices == NULL) {
kfree(dmaru);
return -ENOMEM;
}
ret = alloc_iommu(dmaru);
if (ret) {
dmar_free_dev_scope(&dmaru->devices,
&dmaru->devices_cnt);
kfree(dmaru);
return ret;
}
dmar_register_drhd_unit(dmaru);
out:
if (arg)
(*(int *)arg)++;
return 0;
}
static void dmar_free_drhd(struct dmar_drhd_unit *dmaru)
{
if (dmaru->devices && dmaru->devices_cnt)
dmar_free_dev_scope(&dmaru->devices, &dmaru->devices_cnt);
if (dmaru->iommu)
free_iommu(dmaru->iommu);
kfree(dmaru);
}
static int __init dmar_parse_one_andd(struct acpi_dmar_header *header,
void *arg)
{
struct acpi_dmar_andd *andd = (void *)header;
/* Check for NUL termination within the designated length */
if (strnlen(andd->device_name, header->length - 8) == header->length - 8) {
pr_warn(FW_BUG
"Your BIOS is broken; ANDD object name is not NUL-terminated\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
dmi_get_system_info(DMI_BIOS_VENDOR),
dmi_get_system_info(DMI_BIOS_VERSION),
dmi_get_system_info(DMI_PRODUCT_VERSION));
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
return -EINVAL;
}
pr_info("ANDD device: %x name: %s\n", andd->device_number,
andd->device_name);
return 0;
}
#ifdef CONFIG_ACPI_NUMA
static int dmar_parse_one_rhsa(struct acpi_dmar_header *header, void *arg)
{
struct acpi_dmar_rhsa *rhsa;
struct dmar_drhd_unit *drhd;
rhsa = (struct acpi_dmar_rhsa *)header;
for_each_drhd_unit(drhd) {
if (drhd->reg_base_addr == rhsa->base_address) {
int node = pxm_to_node(rhsa->proximity_domain);
if (node != NUMA_NO_NODE && !node_online(node))
node = NUMA_NO_NODE;
drhd->iommu->node = node;
return 0;
}
}
pr_warn(FW_BUG
"Your BIOS is broken; RHSA refers to non-existent DMAR unit at %llx\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
rhsa->base_address,
dmi_get_system_info(DMI_BIOS_VENDOR),
dmi_get_system_info(DMI_BIOS_VERSION),
dmi_get_system_info(DMI_PRODUCT_VERSION));
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
return 0;
}
#else
#define dmar_parse_one_rhsa dmar_res_noop
#endif
static void
dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
{
struct acpi_dmar_hardware_unit *drhd;
struct acpi_dmar_reserved_memory *rmrr;
struct acpi_dmar_atsr *atsr;
struct acpi_dmar_rhsa *rhsa;
struct acpi_dmar_satc *satc;
switch (header->type) {
case ACPI_DMAR_TYPE_HARDWARE_UNIT:
drhd = container_of(header, struct acpi_dmar_hardware_unit,
header);
pr_info("DRHD base: %#016Lx flags: %#x\n",
(unsigned long long)drhd->address, drhd->flags);
break;
case ACPI_DMAR_TYPE_RESERVED_MEMORY:
rmrr = container_of(header, struct acpi_dmar_reserved_memory,
header);
pr_info("RMRR base: %#016Lx end: %#016Lx\n",
(unsigned long long)rmrr->base_address,
(unsigned long long)rmrr->end_address);
break;
case ACPI_DMAR_TYPE_ROOT_ATS:
atsr = container_of(header, struct acpi_dmar_atsr, header);
pr_info("ATSR flags: %#x\n", atsr->flags);
break;
case ACPI_DMAR_TYPE_HARDWARE_AFFINITY:
rhsa = container_of(header, struct acpi_dmar_rhsa, header);
pr_info("RHSA base: %#016Lx proximity domain: %#x\n",
(unsigned long long)rhsa->base_address,
rhsa->proximity_domain);
break;
case ACPI_DMAR_TYPE_NAMESPACE:
/* We don't print this here because we need to sanity-check
it first. So print it in dmar_parse_one_andd() instead. */
break;
case ACPI_DMAR_TYPE_SATC:
satc = container_of(header, struct acpi_dmar_satc, header);
pr_info("SATC flags: 0x%x\n", satc->flags);
break;
}
}
/**
* dmar_table_detect - checks to see if the platform supports DMAR devices
*/
static int __init dmar_table_detect(void)
{
acpi_status status = AE_OK;
/* if we could find DMAR table, then there are DMAR devices */
status = acpi_get_table(ACPI_SIG_DMAR, 0, &dmar_tbl);
if (ACPI_SUCCESS(status) && !dmar_tbl) {
pr_warn("Unable to map DMAR\n");
status = AE_NOT_FOUND;
}
return ACPI_SUCCESS(status) ? 0 : -ENOENT;
}
static int dmar_walk_remapping_entries(struct acpi_dmar_header *start,
size_t len, struct dmar_res_callback *cb)
{
struct acpi_dmar_header *iter, *next;
struct acpi_dmar_header *end = ((void *)start) + len;
for (iter = start; iter < end; iter = next) {
next = (void *)iter + iter->length;
if (iter->length == 0) {
/* Avoid looping forever on bad ACPI tables */
pr_debug(FW_BUG "Invalid 0-length structure\n");
break;
} else if (next > end) {
/* Avoid passing table end */
pr_warn(FW_BUG "Record passes table end\n");
return -EINVAL;
}
if (cb->print_entry)
dmar_table_print_dmar_entry(iter);
if (iter->type >= ACPI_DMAR_TYPE_RESERVED) {
/* continue for forward compatibility */
pr_debug("Unknown DMAR structure type %d\n",
iter->type);
} else if (cb->cb[iter->type]) {
int ret;
ret = cb->cb[iter->type](iter, cb->arg[iter->type]);
if (ret)
return ret;
} else if (!cb->ignore_unhandled) {
pr_warn("No handler for DMAR structure type %d\n",
iter->type);
return -EINVAL;
}
}
return 0;
}
static inline int dmar_walk_dmar_table(struct acpi_table_dmar *dmar,
struct dmar_res_callback *cb)
{
return dmar_walk_remapping_entries((void *)(dmar + 1),
dmar->header.length - sizeof(*dmar), cb);
}
/**
* parse_dmar_table - parses the DMA reporting table
*/
static int __init
parse_dmar_table(void)
{
struct acpi_table_dmar *dmar;
int drhd_count = 0;
int ret;
struct dmar_res_callback cb = {
.print_entry = true,
.ignore_unhandled = true,
.arg[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &drhd_count,
.cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_parse_one_drhd,
.cb[ACPI_DMAR_TYPE_RESERVED_MEMORY] = &dmar_parse_one_rmrr,
.cb[ACPI_DMAR_TYPE_ROOT_ATS] = &dmar_parse_one_atsr,
.cb[ACPI_DMAR_TYPE_HARDWARE_AFFINITY] = &dmar_parse_one_rhsa,
.cb[ACPI_DMAR_TYPE_NAMESPACE] = &dmar_parse_one_andd,
.cb[ACPI_DMAR_TYPE_SATC] = &dmar_parse_one_satc,
};
/*
* Do it again, earlier dmar_tbl mapping could be mapped with
* fixed map.
*/
dmar_table_detect();
/*
* ACPI tables may not be DMA protected by tboot, so use DMAR copy
* SINIT saved in SinitMleData in TXT heap (which is DMA protected)
*/
dmar_tbl = tboot_get_dmar_table(dmar_tbl);
dmar = (struct acpi_table_dmar *)dmar_tbl;
if (!dmar)
return -ENODEV;
if (dmar->width < PAGE_SHIFT - 1) {
pr_warn("Invalid DMAR haw\n");
return -EINVAL;
}
pr_info("Host address width %d\n", dmar->width + 1);
ret = dmar_walk_dmar_table(dmar, &cb);
if (ret == 0 && drhd_count == 0)
pr_warn(FW_BUG "No DRHD structure found in DMAR table\n");
return ret;
}
static int dmar_pci_device_match(struct dmar_dev_scope devices[],
int cnt, struct pci_dev *dev)
{
int index;
struct device *tmp;
while (dev) {
for_each_active_dev_scope(devices, cnt, index, tmp)
if (dev_is_pci(tmp) && dev == to_pci_dev(tmp))
return 1;
/* Check our parent */
dev = dev->bus->self;
}
return 0;
}
struct dmar_drhd_unit *
dmar_find_matched_drhd_unit(struct pci_dev *dev)
{
struct dmar_drhd_unit *dmaru;
struct acpi_dmar_hardware_unit *drhd;
dev = pci_physfn(dev);
rcu_read_lock();
for_each_drhd_unit(dmaru) {
drhd = container_of(dmaru->hdr,
struct acpi_dmar_hardware_unit,
header);
if (dmaru->include_all &&
drhd->segment == pci_domain_nr(dev->bus))
goto out;
if (dmar_pci_device_match(dmaru->devices,
dmaru->devices_cnt, dev))
goto out;
}
dmaru = NULL;
out:
rcu_read_unlock();
return dmaru;
}
static void __init dmar_acpi_insert_dev_scope(u8 device_number,
struct acpi_device *adev)
{
struct dmar_drhd_unit *dmaru;
struct acpi_dmar_hardware_unit *drhd;
struct acpi_dmar_device_scope *scope;
struct device *tmp;
int i;
struct acpi_dmar_pci_path *path;
for_each_drhd_unit(dmaru) {
drhd = container_of(dmaru->hdr,
struct acpi_dmar_hardware_unit,
header);
for (scope = (void *)(drhd + 1);
(unsigned long)scope < ((unsigned long)drhd) + drhd->header.length;
scope = ((void *)scope) + scope->length) {
if (scope->entry_type != ACPI_DMAR_SCOPE_TYPE_NAMESPACE)
continue;
if (scope->enumeration_id != device_number)
continue;
path = (void *)(scope + 1);
pr_info("ACPI device \"%s\" under DMAR at %llx as %02x:%02x.%d\n",
dev_name(&adev->dev), dmaru->reg_base_addr,
scope->bus, path->device, path->function);
for_each_dev_scope(dmaru->devices, dmaru->devices_cnt, i, tmp)
if (tmp == NULL) {
dmaru->devices[i].bus = scope->bus;
dmaru->devices[i].devfn = PCI_DEVFN(path->device,
path->function);
rcu_assign_pointer(dmaru->devices[i].dev,
get_device(&adev->dev));
return;
}
BUG_ON(i >= dmaru->devices_cnt);
}
}
pr_warn("No IOMMU scope found for ANDD enumeration ID %d (%s)\n",
device_number, dev_name(&adev->dev));
}
static int __init dmar_acpi_dev_scope_init(void)
{
struct acpi_dmar_andd *andd;
if (dmar_tbl == NULL)
return -ENODEV;
for (andd = (void *)dmar_tbl + sizeof(struct acpi_table_dmar);
((unsigned long)andd) < ((unsigned long)dmar_tbl) + dmar_tbl->length;
andd = ((void *)andd) + andd->header.length) {
if (andd->header.type == ACPI_DMAR_TYPE_NAMESPACE) {
acpi_handle h;
struct acpi_device *adev;
if (!ACPI_SUCCESS(acpi_get_handle(ACPI_ROOT_OBJECT,
andd->device_name,
&h))) {
pr_err("Failed to find handle for ACPI object %s\n",
andd->device_name);
continue;
}
if (acpi_bus_get_device(h, &adev)) {
pr_err("Failed to get device for ACPI object %s\n",
andd->device_name);
continue;
}
dmar_acpi_insert_dev_scope(andd->device_number, adev);
}
}
return 0;
}
int __init dmar_dev_scope_init(void)
{
struct pci_dev *dev = NULL;
struct dmar_pci_notify_info *info;
if (dmar_dev_scope_status != 1)
return dmar_dev_scope_status;
if (list_empty(&dmar_drhd_units)) {
dmar_dev_scope_status = -ENODEV;
} else {
dmar_dev_scope_status = 0;
dmar_acpi_dev_scope_init();
for_each_pci_dev(dev) {
if (dev->is_virtfn)
continue;
info = dmar_alloc_pci_notify_info(dev,
BUS_NOTIFY_ADD_DEVICE);
if (!info) {
return dmar_dev_scope_status;
} else {
dmar_pci_bus_add_dev(info);
dmar_free_pci_notify_info(info);
}
}
}
return dmar_dev_scope_status;
}
void __init dmar_register_bus_notifier(void)
{
bus_register_notifier(&pci_bus_type, &dmar_pci_bus_nb);
}
int __init dmar_table_init(void)
{
static int dmar_table_initialized;
int ret;
if (dmar_table_initialized == 0) {
ret = parse_dmar_table();
if (ret < 0) {
if (ret != -ENODEV)
pr_info("Parse DMAR table failure.\n");
} else if (list_empty(&dmar_drhd_units)) {
pr_info("No DMAR devices found\n");
ret = -ENODEV;
}
if (ret < 0)
dmar_table_initialized = ret;
else
dmar_table_initialized = 1;
}
return dmar_table_initialized < 0 ? dmar_table_initialized : 0;
}
static void warn_invalid_dmar(u64 addr, const char *message)
{
pr_warn_once(FW_BUG
"Your BIOS is broken; DMAR reported at address %llx%s!\n"
"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
addr, message,
dmi_get_system_info(DMI_BIOS_VENDOR),
dmi_get_system_info(DMI_BIOS_VERSION),
dmi_get_system_info(DMI_PRODUCT_VERSION));
add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
}
static int __ref
dmar_validate_one_drhd(struct acpi_dmar_header *entry, void *arg)
{
struct acpi_dmar_hardware_unit *drhd;
void __iomem *addr;
u64 cap, ecap;
drhd = (void *)entry;
if (!drhd->address) {
warn_invalid_dmar(0, "");
return -EINVAL;
}
if (arg)
addr = ioremap(drhd->address, VTD_PAGE_SIZE);
else
addr = early_ioremap(drhd->address, VTD_PAGE_SIZE);
if (!addr) {
pr_warn("Can't validate DRHD address: %llx\n", drhd->address);
return -EINVAL;
}
cap = dmar_readq(addr + DMAR_CAP_REG);
ecap = dmar_readq(addr + DMAR_ECAP_REG);
if (arg)
iounmap(addr);
else
early_iounmap(addr, VTD_PAGE_SIZE);
if (cap == (uint64_t)-1 && ecap == (uint64_t)-1) {
warn_invalid_dmar(drhd->address, " returns all ones");
return -EINVAL;
}
return 0;
}
int __init detect_intel_iommu(void)
{
int ret;
struct dmar_res_callback validate_drhd_cb = {
.cb[ACPI_DMAR_TYPE_HARDWARE_UNIT] = &dmar_validate_one_drhd,
.ignore_unhandled = true,
};
down_write(&dmar_global_lock);
ret = dmar_table_detect();
if (!ret)
ret = dmar_walk_dmar_table((struct acpi_table_dmar *)dmar_tbl,
&validate_drhd_cb);
if (!ret && !no_iommu && !iommu_detected &&
(!dmar_disabled || dmar_platform_optin())) {
iommu_detected = 1;
/* Make sure ACS will be enabled */
pci_request_acs();
}
#ifdef CONFIG_X86
if (!ret) {
x86_init.iommu.iommu_init = intel_iommu_init;
x86_platform.iommu_shutdown = intel_iommu_shutdown;
}
#endif
if (dmar_tbl) {
acpi_put_table(dmar_tbl);
dmar_tbl = NULL;
}
up_write(&dmar_global_lock);
return ret ? ret : 1;
}
static void unmap_iommu(struct intel_iommu *iommu)
{
iounmap(iommu->reg);
release_mem_region(iommu->reg_phys, iommu->reg_size);
}
/**
* map_iommu: map the iommu's registers
* @iommu: the iommu to map
* @phys_addr: the physical address of the base resgister
*
* Memory map the iommu's registers. Start w/ a single page, and
* possibly expand if that turns out to be insufficent.
*/
static int map_iommu(struct intel_iommu *iommu, u64 phys_addr)
{
int map_size, err=0;
iommu->reg_phys = phys_addr;
iommu->reg_size = VTD_PAGE_SIZE;
if (!request_mem_region(iommu->reg_phys, iommu->reg_size, iommu->name)) {
pr_err("Can't reserve memory\n");
err = -EBUSY;
goto out;
}
iommu->reg = ioremap(iommu->reg_phys, iommu->reg_size);
if (!iommu->reg) {
pr_err("Can't map the region\n");
err = -ENOMEM;
goto release;
}
iommu->cap = dmar_readq(iommu->reg + DMAR_CAP_REG);
iommu->ecap = dmar_readq(iommu->reg + DMAR_ECAP_REG);
if (iommu->cap == (uint64_t)-1 && iommu->ecap == (uint64_t)-1) {
err = -EINVAL;
warn_invalid_dmar(phys_addr, " returns all ones");
goto unmap;
}
if (ecap_vcs(iommu->ecap))
iommu->vccap = dmar_readq(iommu->reg + DMAR_VCCAP_REG);
/* the registers might be more than one page */
map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
cap_max_fault_reg_offset(iommu->cap));