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iommu/vt-d: Parse SATC reporting structure

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Software should parse every SATC table and all devices in the tables
reported by the BIOS and keep the information in kernel list for further
reference.

Signed-off-by: Yian Chen <yian.chen@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210203093329.1617808-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20210204014401.2846425-7-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Yian Chen 2021-02-04 09:44:00 +08:00 committed by Joerg Roedel
parent 81d3c75bb3
commit 31a75cbbb9
3 changed files with 99 additions and 0 deletions
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8
drivers/iommu/intel/dmar.c
View File

@ -526,6 +526,7 @@ dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
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:
@ -555,6 +556,10 @@ dmar_table_print_dmar_entry(struct acpi_dmar_header *header)
/* 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;
}
}
@ -642,6 +647,7 @@ parse_dmar_table(void)
.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,
};
/*
@ -2077,6 +2083,7 @@ static guid_t dmar_hp_guid =
#define DMAR_DSM_FUNC_DRHD 1
#define DMAR_DSM_FUNC_ATSR 2
#define DMAR_DSM_FUNC_RHSA 3
#define DMAR_DSM_FUNC_SATC 4
static inline bool dmar_detect_dsm(acpi_handle handle, int func)
{
@ -2094,6 +2101,7 @@ static int dmar_walk_dsm_resource(acpi_handle handle, int func,
[DMAR_DSM_FUNC_DRHD] = ACPI_DMAR_TYPE_HARDWARE_UNIT,
[DMAR_DSM_FUNC_ATSR] = ACPI_DMAR_TYPE_ROOT_ATS,
[DMAR_DSM_FUNC_RHSA] = ACPI_DMAR_TYPE_HARDWARE_AFFINITY,
[DMAR_DSM_FUNC_SATC] = ACPI_DMAR_TYPE_SATC,
};
if (!dmar_detect_dsm(handle, func))

89
drivers/iommu/intel/iommu.c
View File

@ -316,8 +316,18 @@ struct dmar_atsr_unit {
u8 include_all:1; /* include all ports */
};
struct dmar_satc_unit {
struct list_head list; /* list of SATC units */
struct acpi_dmar_header *hdr; /* ACPI header */
struct dmar_dev_scope *devices; /* target devices */
struct intel_iommu *iommu; /* the corresponding iommu */
int devices_cnt; /* target device count */
u8 atc_required:1; /* ATS is required */
};
static LIST_HEAD(dmar_atsr_units);
static LIST_HEAD(dmar_rmrr_units);
static LIST_HEAD(dmar_satc_units);
#define for_each_rmrr_units(rmrr) \
list_for_each_entry(rmrr, &dmar_rmrr_units, list)
@ -3716,6 +3726,57 @@ int dmar_check_one_atsr(struct acpi_dmar_header *hdr, void *arg)
return 0;
}
static struct dmar_satc_unit *dmar_find_satc(struct acpi_dmar_satc *satc)
{
struct dmar_satc_unit *satcu;
struct acpi_dmar_satc *tmp;
list_for_each_entry_rcu(satcu, &dmar_satc_units, list,
dmar_rcu_check()) {
tmp = (struct acpi_dmar_satc *)satcu->hdr;
if (satc->segment != tmp->segment)
continue;
if (satc->header.length != tmp->header.length)
continue;
if (memcmp(satc, tmp, satc->header.length) == 0)
return satcu;
}
return NULL;
}
int dmar_parse_one_satc(struct acpi_dmar_header *hdr, void *arg)
{
struct acpi_dmar_satc *satc;
struct dmar_satc_unit *satcu;
if (system_state >= SYSTEM_RUNNING && !intel_iommu_enabled)
return 0;
satc = container_of(hdr, struct acpi_dmar_satc, header);
satcu = dmar_find_satc(satc);
if (satcu)
return 0;
satcu = kzalloc(sizeof(*satcu) + hdr->length, GFP_KERNEL);
if (!satcu)
return -ENOMEM;
satcu->hdr = (void *)(satcu + 1);
memcpy(satcu->hdr, hdr, hdr->length);
satcu->atc_required = satc->flags & 0x1;
satcu->devices = dmar_alloc_dev_scope((void *)(satc + 1),
(void *)satc + satc->header.length,
&satcu->devices_cnt);
if (satcu->devices_cnt && !satcu->devices) {
kfree(satcu);
return -ENOMEM;
}
list_add_rcu(&satcu->list, &dmar_satc_units);
return 0;
}
static int intel_iommu_add(struct dmar_drhd_unit *dmaru)
{
int sp, ret;
@ -3823,6 +3884,7 @@ static void intel_iommu_free_dmars(void)
{
struct dmar_rmrr_unit *rmrru, *rmrr_n;
struct dmar_atsr_unit *atsru, *atsr_n;
struct dmar_satc_unit *satcu, *satc_n;
list_for_each_entry_safe(rmrru, rmrr_n, &dmar_rmrr_units, list) {
list_del(&rmrru->list);
@ -3834,6 +3896,11 @@ static void intel_iommu_free_dmars(void)
list_del(&atsru->list);
intel_iommu_free_atsr(atsru);
}
list_for_each_entry_safe(satcu, satc_n, &dmar_satc_units, list) {
list_del(&satcu->list);
dmar_free_dev_scope(&satcu->devices, &satcu->devices_cnt);
kfree(satcu);
}
}
int dmar_find_matched_atsr_unit(struct pci_dev *dev)
@ -3885,8 +3952,10 @@ int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
int ret;
struct dmar_rmrr_unit *rmrru;
struct dmar_atsr_unit *atsru;
struct dmar_satc_unit *satcu;
struct acpi_dmar_atsr *atsr;
struct acpi_dmar_reserved_memory *rmrr;
struct acpi_dmar_satc *satc;
if (!intel_iommu_enabled && system_state >= SYSTEM_RUNNING)
return 0;
@ -3927,6 +3996,23 @@ int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
break;
}
}
list_for_each_entry(satcu, &dmar_satc_units, list) {
satc = container_of(satcu->hdr, struct acpi_dmar_satc, header);
if (info->event == BUS_NOTIFY_ADD_DEVICE) {
ret = dmar_insert_dev_scope(info, (void *)(satc + 1),
(void *)satc + satc->header.length,
satc->segment, satcu->devices,
satcu->devices_cnt);
if (ret > 0)
break;
else if (ret < 0)
return ret;
} else if (info->event == BUS_NOTIFY_REMOVED_DEVICE) {
if (dmar_remove_dev_scope(info, satc->segment,
satcu->devices, satcu->devices_cnt))
break;
}
}
return 0;
}
@ -4270,6 +4356,9 @@ int __init intel_iommu_init(void)
if (list_empty(&dmar_atsr_units))
pr_info("No ATSR found\n");
if (list_empty(&dmar_satc_units))
pr_info("No SATC found\n");
if (dmar_map_gfx)
intel_iommu_gfx_mapped = 1;

2
include/linux/dmar.h
View File

@ -138,6 +138,7 @@ extern void intel_iommu_shutdown(void);
extern int dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg);
extern int dmar_parse_one_atsr(struct acpi_dmar_header *header, void *arg);
extern int dmar_check_one_atsr(struct acpi_dmar_header *hdr, void *arg);
extern int dmar_parse_one_satc(struct acpi_dmar_header *hdr, void *arg);
extern int dmar_release_one_atsr(struct acpi_dmar_header *hdr, void *arg);
extern int dmar_iommu_hotplug(struct dmar_drhd_unit *dmaru, bool insert);
extern int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info);
@ -149,6 +150,7 @@ static inline void intel_iommu_shutdown(void) { }
#define dmar_parse_one_atsr dmar_res_noop
#define dmar_check_one_atsr dmar_res_noop
#define dmar_release_one_atsr dmar_res_noop
#define dmar_parse_one_satc dmar_res_noop
static inline int dmar_iommu_notify_scope_dev(struct dmar_pci_notify_info *info)
{