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ACPI: Keep sub-table parsing infrastructure available for modules

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The NFIT driver and now the CXL ACPI driver have both open-coded ACPI
table parsing. Before another instance is added arrange for the core
ACPI sub-table parsing to be optionally available to drivers via the
CONFIG_ACPI_TABLE_LIB symbol. If no drivers select the symbol then the
infrastructure reverts back to being tagged __init via the
__init_or_acpilib annotation.

For now, only tag the core sub-table routines and data that the CEDT parsing in
the cxl_acpi driver would want to reuse, a CEDT parsing helper is added
in a later change.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Len Brown <lenb@kernel.org>
Cc: Alison Schofield <alison.schofield@intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://lore.kernel.org/r/163553709227.2509508.8215196520233473814.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2021-10-29 12:51:32 -07:00
parent 09eac2ca98
commit f64bd790b7
3 changed files with 31 additions and 21 deletions
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22
include/linux/acpi.h
View file

@ -232,14 +232,22 @@ int acpi_locate_initial_tables (void);
void acpi_reserve_initial_tables (void);
void acpi_table_init_complete (void);
int acpi_table_init (void);
#ifdef CONFIG_ACPI_TABLE_LIB
#define __init_or_acpilib
#define __initdata_or_acpilib
#else
#define __init_or_acpilib __init
#define __initdata_or_acpilib __initdata
#endif
int acpi_table_parse(char *id, acpi_tbl_table_handler handler);
int __init acpi_table_parse_entries(char *id, unsigned long table_size,
int entry_id,
acpi_tbl_entry_handler handler,
unsigned int max_entries);
int __init acpi_table_parse_entries_array(char *id, unsigned long table_size,
struct acpi_subtable_proc *proc, int proc_num,
unsigned int max_entries);
int __init_or_acpilib acpi_table_parse_entries(char *id,
unsigned long table_size, int entry_id,
acpi_tbl_entry_handler handler, unsigned int max_entries);
int __init_or_acpilib acpi_table_parse_entries_array(char *id,
unsigned long table_size, struct acpi_subtable_proc *proc,
int proc_num, unsigned int max_entries);
int acpi_table_parse_madt(enum acpi_madt_type id,
acpi_tbl_entry_handler handler,
unsigned int max_entries);