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arch/x86: Add a function to retrieve ID from ACPI's DMAR

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This will be necessary to get IOAPIC and HPET source ids for VT-D.

Signed-off-by: Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
This commit is contained in:
Tomasz Bursztyka 2021-04-06 11:15:43 +02:00 • committed by Anas Nashif
commit 345e122dd2
2 changed files with 65 additions and 0 deletions
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52
arch/x86/core/acpi.c
View file

@ -383,3 +383,55 @@ z_acpi_get_dev_scope_paths(struct acpi_dmar_dev_scope *dev_scope, int *n)
return dev_scope->path; return dev_scope->path;
} }
uint16_t z_acpi_get_dev_id_from_dmar(uint8_t dev_scope_type)
{
struct acpi_drhd *drhd;
int n_drhd;
find_dmar();
if (dmar == NULL) {
return USHRT_MAX;
}
drhd = z_acpi_find_drhds(&n_drhd);
for (; n_drhd > 0; n_drhd--) {
struct acpi_dmar_dev_scope *dev_scope;
int n_ds;
dev_scope = z_acpi_get_drhd_dev_scopes(drhd, &n_ds);
for (; n_ds > 0; n_ds--) {
if (dev_scope->type == dev_scope_type) {
struct acpi_dmar_dev_path *path;
int n_path;
path = z_acpi_get_dev_scope_paths(dev_scope,
&n_path);
if (n_path > 0) {
union acpi_dmar_id id;
/* Let's over simplify for now:
* we don't look for secondary bus
* and extra paths. We just stop here.
*/
id.bits.bus = dev_scope->start_bus_num;
id.bits.device = path->device;
id.bits.function = path->function;
return id.raw;
}
}
dev_scope = (struct acpi_dmar_dev_scope *)(
POINTER_TO_UINT(dev_scope) + dev_scope->length);
}
drhd = (struct acpi_drhd *)(POINTER_TO_UINT(drhd) +
drhd->entry.length);
}
return USHRT_MAX;
}

13
include/arch/x86/acpi.h
View file

@ -159,6 +159,16 @@ struct acpi_dmar {
struct acpi_dmar_entry remap_entries[]; struct acpi_dmar_entry remap_entries[];
} __packed; } __packed;
union acpi_dmar_id {
struct {
uint16_t function : 3;
uint16_t device : 5;
uint16_t bus : 8;
} bits;
uint16_t raw;
};
#if defined(CONFIG_ACPI) #if defined(CONFIG_ACPI)
void *z_acpi_find_table(uint32_t signature); void *z_acpi_find_table(uint32_t signature);
@ -175,6 +185,8 @@ struct acpi_dmar_dev_scope *z_acpi_get_drhd_dev_scopes(struct acpi_drhd *drhd,
struct acpi_dmar_dev_path * struct acpi_dmar_dev_path *
z_acpi_get_dev_scope_paths(struct acpi_dmar_dev_scope *dev_scope, int *n); z_acpi_get_dev_scope_paths(struct acpi_dmar_dev_scope *dev_scope, int *n);
uint16_t z_acpi_get_dev_id_from_dmar(uint8_t dev_scope_type);
#else /* CONFIG_ACPI */ #else /* CONFIG_ACPI */
#define z_acpi_find_table(...) NULL #define z_acpi_find_table(...) NULL
@ -183,6 +195,7 @@ z_acpi_get_dev_scope_paths(struct acpi_dmar_dev_scope *dev_scope, int *n);
#define z_acpi_find_drhds(...) NULL #define z_acpi_find_drhds(...) NULL
#define z_acpi_get_drhd_dev_scopes(...) NULL #define z_acpi_get_drhd_dev_scopes(...) NULL
#define z_acpi_get_dev_scope_paths(...) NULL #define z_acpi_get_dev_scope_paths(...) NULL
#define z_acpi_get_dev_id_from_dmar(...) USHRT_MAX
#endif /* CONFIG_ACPI */ #endif /* CONFIG_ACPI */