Commit f08bb472 authored by Ashwin Chaugule's avatar Ashwin Chaugule Committed by Rafael J. Wysocki
Browse files

ACPI / table: Add new function to get table entries 



The acpi_table_parse() function has a callback that
passes a pointer to a table_header. Add a new function
which takes this pointer and parses its entries. This
eliminates the need to re-traverse all the tables for
each call. e.g. as in acpi_table_parse_madt() which is
normally called after acpi_table_parse().

Acked-by: default avatarGrant Likely <grant.likely@linaro.org>
Signed-off-by: default avatarAshwin Chaugule <ashwin.chaugule@linaro.org>
Signed-off-by: default avatarTomasz Nowicki <tomasz.nowicki@linaro.org>
Signed-off-by: default avatarHanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 5d01410f

drivers/acpi/tables.c

+44 −19
Original line number Diff line number Diff line
@@ -190,30 +190,24 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header) 
	}

}





int __init

acpi_table_parse_entries(char *id,

			     unsigned long table_size,

			     int entry_id,

acpi_parse_entries(char *id, unsigned long table_size,

		acpi_tbl_entry_handler handler,

			     unsigned int max_entries)

		struct acpi_table_header *table_header,

		int entry_id, unsigned int max_entries)

{

	struct acpi_table_header *table_header = NULL;

	struct acpi_subtable_header *entry;

	unsigned int count = 0;

	int count = 0;

	unsigned long table_end;

	acpi_size tbl_size;



	if (acpi_disabled)

		return -ENODEV;



	if (!handler)

	if (!id || !handler)

		return -EINVAL;



	if (strncmp(id, ACPI_SIG_MADT, 4) == 0)

		acpi_get_table_with_size(id, acpi_apic_instance, &table_header, &tbl_size);

	else

		acpi_get_table_with_size(id, 0, &table_header, &tbl_size);

	if (!table_size)

		return -EINVAL;



	if (!table_header) {

		pr_warn("%4.4s not present\n", id);
@@ -232,7 +226,7 @@ acpi_table_parse_entries(char *id, 
		if (entry->type == entry_id

		    && (!max_entries || count++ < max_entries))

			if (handler(entry, table_end))

				goto err;

				return -EINVAL;



		/*

		 * If entry->length is 0, break from this loop to avoid
@@ -240,22 +234,53 @@ acpi_table_parse_entries(char *id, 
		 */

		if (entry->length == 0) {

			pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, entry_id);

			goto err;

			return -EINVAL;

		}



		entry = (struct acpi_subtable_header *)

		    ((unsigned long)entry + entry->length);

	}



	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);

	}



	early_acpi_os_unmap_memory((char *)table_header, tbl_size);

	return count;

err:

	early_acpi_os_unmap_memory((char *)table_header, tbl_size);

}



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_table_header *table_header = NULL;

	acpi_size tbl_size;

	int count;

	u32 instance = 0;



	if (acpi_disabled)

		return -ENODEV;



	if (!id || !handler)

		return -EINVAL;



	if (!strncmp(id, ACPI_SIG_MADT, 4))

		instance = acpi_apic_instance;



	acpi_get_table_with_size(id, instance, &table_header, &tbl_size);

	if (!table_header) {

		pr_warn("%4.4s not present\n", id);

		return -ENODEV;

	}



	count = acpi_parse_entries(id, table_size, handler, table_header,

			entry_id, max_entries);



	early_acpi_os_unmap_memory((char *)table_header, tbl_size);

	return count;

}



int __init

include/linux/acpi.h

+4 −0
Original line number Diff line number Diff line
@@ -123,6 +123,10 @@ int acpi_numa_init (void); 


int acpi_table_init (void);

int acpi_table_parse(char *id, acpi_tbl_table_handler handler);

int __init 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);

int __init acpi_table_parse_entries(char *id, unsigned long table_size,

				    int entry_id,

				    acpi_tbl_entry_handler handler,

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