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Revert "ACPI/IORT: Fix 'Number of IDs' handling in iort_id_map()"

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This reverts commit 3c23b83a88.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20200501161014.5935-2-ardb@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Ard Biesheuvel 2020-05-01 18:10:13 +02:00 committed by Will Deacon
parent 7fb89e1d44
commit 6d3b29d07c
1 changed files with 2 additions and 55 deletions
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57
drivers/acpi/arm64/iort.c
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@ -299,59 +299,6 @@ static acpi_status iort_match_node_callback(struct acpi_iort_node *node,
return status;
}
struct iort_workaround_oem_info {
char oem_id[ACPI_OEM_ID_SIZE + 1];
char oem_table_id[ACPI_OEM_TABLE_ID_SIZE + 1];
u32 oem_revision;
};
static bool apply_id_count_workaround;
static struct iort_workaround_oem_info wa_info[] __initdata = {
{
.oem_id = "HISI ",
.oem_table_id = "HIP07 ",
.oem_revision = 0,
}, {
.oem_id = "HISI ",
.oem_table_id = "HIP08 ",
.oem_revision = 0,
}
};
static void __init
iort_check_id_count_workaround(struct acpi_table_header *tbl)
{
int i;
for (i = 0; i < ARRAY_SIZE(wa_info); i++) {
if (!memcmp(wa_info[i].oem_id, tbl->oem_id, ACPI_OEM_ID_SIZE) &&
!memcmp(wa_info[i].oem_table_id, tbl->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
wa_info[i].oem_revision == tbl->oem_revision) {
apply_id_count_workaround = true;
pr_warn(FW_BUG "ID count for ID mapping entry is wrong, applying workaround\n");
break;
}
}
}
static inline u32 iort_get_map_max(struct acpi_iort_id_mapping *map)
{
u32 map_max = map->input_base + map->id_count;
/*
* The IORT specification revision D (Section 3, table 4, page 9) says
* Number of IDs = The number of IDs in the range minus one, but the
* IORT code ignored the "minus one", and some firmware did that too,
* so apply a workaround here to keep compatible with both the spec
* compliant and non-spec compliant firmwares.
*/
if (apply_id_count_workaround)
map_max--;
return map_max;
}
static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
u32 *rid_out)
{
@ -368,7 +315,8 @@ static int iort_id_map(struct acpi_iort_id_mapping *map, u8 type, u32 rid_in,
return -ENXIO;
}
if (rid_in < map->input_base || rid_in > iort_get_map_max(map))
if (rid_in < map->input_base ||
(rid_in >= map->input_base + map->id_count))
return -ENXIO;
*rid_out = map->output_base + (rid_in - map->input_base);
@ -1700,6 +1648,5 @@ void __init acpi_iort_init(void)
return;
}
iort_check_id_count_workaround(iort_table);
iort_init_platform_devices();
}