diff options
author | Lukasz Anaczkowski <lukasz.anaczkowski@intel.com> | 2015-09-09 13:47:28 (GMT) |
---|---|---|
committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-10-14 23:29:39 (GMT) |
commit | 9b3fedde27d3d63055c43c05e8254e252e58ba48 (patch) | |
tree | 0ce3f5e0b33bc55ecb395fd4644058086c17da97 /drivers/acpi/tables.c | |
parent | 6ff33f3902c3b1c5d0db6b1e2c70b6d76fba357f (diff) | |
download | linux-9b3fedde27d3d63055c43c05e8254e252e58ba48.tar.xz |
ACPI / tables: Add acpi_subtable_proc to ACPI table parsers
ACPI subtable parsing needs to be extended to allow two or more
handlers to be run in the same ACPI table walk, thus adding
acpi_subtable_proc structure which stores
() ACPI table id
() handler that processes table
() counter how many items has been processed
and passing it to acpi_parse_entries_array() and
acpi_table_parse_entries_array().
This is needed to fix CPU enumeration when APIC/X2APIC entries
are interleaved.
Signed-off-by: Lukasz Anaczkowski <lukasz.anaczkowski@intel.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Tested-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/tables.c')
-rw-r--r-- | drivers/acpi/tables.c | 93 |
1 files changed, 75 insertions, 18 deletions
diff --git a/drivers/acpi/tables.c b/drivers/acpi/tables.c index 17a6fa0..c1ff58d 100644 --- a/drivers/acpi/tables.c +++ b/drivers/acpi/tables.c @@ -210,20 +210,39 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header) } } -int __init -acpi_parse_entries(char *id, unsigned long table_size, - acpi_tbl_entry_handler handler, +/** + * acpi_parse_entries_array - for each proc_num find a suitable subtable + * + * @id: table id (for debugging purposes) + * @table_size: single entry size + * @table_header: where does the table start? + * @proc: array of acpi_subtable_proc struct containing entry id + * and associated handler with it + * @proc_num: how big proc is? + * @max_entries: how many entries can we process? + * + * For each proc_num find a subtable with proc->id and run proc->handler + * on it. Assumption is that there's only single handler for particular + * entry id. + * + * On success returns sum of all matching entries for all proc handlers. + * Otherwise, -ENODEV or -EINVAL is returned. + */ +static int __init +acpi_parse_entries_array(char *id, unsigned long table_size, struct acpi_table_header *table_header, - int entry_id, unsigned int max_entries) + struct acpi_subtable_proc *proc, int proc_num, + unsigned int max_entries) { struct acpi_subtable_header *entry; - int count = 0; unsigned long table_end; + int count = 0; + int i; if (acpi_disabled) return -ENODEV; - if (!id || !handler) + if (!id) return -EINVAL; if (!table_size) @@ -243,20 +262,27 @@ acpi_parse_entries(char *id, unsigned long table_size, while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) < table_end) { - if (entry->type == entry_id - && (!max_entries || count < max_entries)) { - if (handler(entry, table_end)) + if (max_entries && count >= max_entries) + break; + + for (i = 0; i < proc_num; i++) { + if (entry->type != proc[i].id) + continue; + if (!proc->handler || proc[i].handler(entry, table_end)) return -EINVAL; - count++; + proc->count++; + break; } + if (i != proc_num) + count++; /* * If entry->length is 0, break from this loop to avoid * infinite loop. */ if (entry->length == 0) { - pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id); + pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id); return -EINVAL; } @@ -266,17 +292,32 @@ acpi_parse_entries(char *id, unsigned long table_size, if (max_entries && count > max_entries) { pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n", - id, entry_id, count - max_entries, count); + id, proc->id, count - max_entries, count); } return count; } int __init -acpi_table_parse_entries(char *id, +acpi_parse_entries(char *id, + unsigned long table_size, + acpi_tbl_entry_handler handler, + struct acpi_table_header *table_header, + int entry_id, unsigned int max_entries) +{ + struct acpi_subtable_proc proc = { + .id = entry_id, + .handler = handler, + }; + + return acpi_parse_entries_array(id, table_size, table_header, + &proc, 1, max_entries); +} + +int __init +acpi_table_parse_entries_array(char *id, unsigned long table_size, - int entry_id, - acpi_tbl_entry_handler handler, + struct acpi_subtable_proc *proc, int proc_num, unsigned int max_entries) { struct acpi_table_header *table_header = NULL; @@ -287,7 +328,7 @@ acpi_table_parse_entries(char *id, if (acpi_disabled) return -ENODEV; - if (!id || !handler) + if (!id) return -EINVAL; if (!strncmp(id, ACPI_SIG_MADT, 4)) @@ -299,14 +340,30 @@ acpi_table_parse_entries(char *id, return -ENODEV; } - count = acpi_parse_entries(id, table_size, handler, table_header, - entry_id, max_entries); + count = acpi_parse_entries_array(id, table_size, table_header, + proc, proc_num, max_entries); early_acpi_os_unmap_memory((char *)table_header, tbl_size); return count; } int __init +acpi_table_parse_entries(char *id, + unsigned long table_size, + int entry_id, + acpi_tbl_entry_handler handler, + unsigned int max_entries) +{ + struct acpi_subtable_proc proc = { + .id = entry_id, + .handler = handler, + }; + + return acpi_table_parse_entries_array(id, table_size, &proc, 1, + max_entries); +} + +int __init acpi_table_parse_madt(enum acpi_madt_type id, acpi_tbl_entry_handler handler, unsigned int max_entries) { |