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acpi: Add support for DMAR

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The DMA Remapping Reporting (DMAR) table contains information about DMA
remapping.

Add a version simple version of this table with only the minimum fields
filled out. i.e. no entries.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
This commit is contained in:
Simon Glass 2020-04-08 16:57:39 -06:00 committed by Bin Meng
parent 91fe8b79f6
commit bfeb5d460c
3 changed files with 101 additions and 0 deletions
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54
include/acpi/acpi_table.h
View File

@ -360,6 +360,51 @@ struct acpi_csrt_shared_info {
u32 max_block_size;
};
enum dmar_type {
DMAR_DRHD = 0,
DMAR_RMRR = 1,
DMAR_ATSR = 2,
DMAR_RHSA = 3,
DMAR_ANDD = 4
};
enum {
DRHD_INCLUDE_PCI_ALL = BIT(0)
};
enum dmar_flags {
DMAR_INTR_REMAP = BIT(0),
DMAR_X2APIC_OPT_OUT = BIT(1),
DMAR_CTRL_PLATFORM_OPT_IN_FLAG = BIT(2),
};
struct dmar_entry {
u16 type;
u16 length;
u8 flags;
u8 reserved;
u16 segment;
u64 bar;
};
struct dmar_rmrr_entry {
u16 type;
u16 length;
u16 reserved;
u16 segment;
u64 bar;
u64 limit;
};
/* DMAR (DMA Remapping Reporting Structure) */
struct __packed acpi_dmar {
struct acpi_table_header header;
u8 host_address_width;
u8 flags;
u8 reserved[10];
struct dmar_entry structure[0];
};
/* DBG2 definitions are partially used for SPCR interface_type */
/* Types for port_type field */
@ -451,6 +496,15 @@ enum acpi_tables {
*/
int acpi_get_table_revision(enum acpi_tables table);
/**
* acpi_create_dmar() - Create a DMA Remapping Reporting (DMAR) table
*
* @dmar: Place to put the table
* @flags: DMAR flags to use
* @return 0 if OK, -ve on error
*/
int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags);
#endif /* !__ACPI__*/
#include <asm/acpi_table.h>

31
lib/acpi/acpi_table.c
View File

@ -7,6 +7,37 @@
#include <common.h>
#include <acpi/acpi_table.h>
#include <dm.h>
#include <cpu.h>
/* Temporary change to ensure bisectability */
#ifndef CONFIG_SANDBOX
int acpi_create_dmar(struct acpi_dmar *dmar, enum dmar_flags flags)
{
struct acpi_table_header *header = &dmar->header;
struct cpu_info info;
struct udevice *cpu;
int ret;
ret = uclass_first_device(UCLASS_CPU, &cpu);
if (ret)
return log_msg_ret("cpu", ret);
ret = cpu_get_info(cpu, &info);
if (ret)
return log_msg_ret("info", ret);
memset((void *)dmar, 0, sizeof(struct acpi_dmar));
/* Fill out header fields. */
acpi_fill_header(&dmar->header, "DMAR");
header->length = sizeof(struct acpi_dmar);
header->revision = acpi_get_table_revision(ACPITAB_DMAR);
dmar->host_address_width = info.address_width - 1;
dmar->flags = flags;
return 0;
}
#endif
int acpi_get_table_revision(enum acpi_tables table)
{

16
test/dm/acpi.c
View File

@ -67,3 +67,19 @@ static int dm_test_acpi_get_table_revision(struct unit_test_state *uts)
}
DM_TEST(dm_test_acpi_get_table_revision,
DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
/* Temporary change to ensure bisectability */
#ifndef CONFIG_SANDBOX
/* Test acpi_create_dmar() */
static int dm_test_acpi_create_dmar(struct unit_test_state *uts)
{
struct acpi_dmar dmar;
ut_assertok(acpi_create_dmar(&dmar, DMAR_INTR_REMAP));
ut_asserteq(DMAR_INTR_REMAP, dmar.flags);
ut_asserteq(32 - 1, dmar.host_address_width);
return 0;
}
DM_TEST(dm_test_acpi_create_dmar, DM_TESTF_SCAN_PDATA | DM_TESTF_SCAN_FDT);
#endif