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Commit 0c659b82 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Jeff Garzik
Browse files

ata: Add TRIM infrastructure 



This is common code shared between the IDE and libata implementations

Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: default avatarMatthew Wilcox <willy@linux.intel.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@redhat.com>
parent c3f93b8f

include/linux/ata.h

+41 −0
Original line number Diff line number Diff line
@@ -29,6 +29,8 @@ 
#ifndef __LINUX_ATA_H__

#define __LINUX_ATA_H__



#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/types.h>

#include <asm/byteorder.h>
@@ -91,6 +93,7 @@ enum { 
	ATA_ID_CFA_POWER	= 160,

	ATA_ID_CFA_KEY_MGMT	= 162,

	ATA_ID_CFA_MODES	= 163,

	ATA_ID_DATA_SET_MGMT	= 169,

	ATA_ID_ROT_SPEED	= 217,

	ATA_ID_PIO4		= (1 << 1),
@@ -248,6 +251,7 @@ enum { 
	ATA_CMD_SMART		= 0xB0,

	ATA_CMD_MEDIA_LOCK	= 0xDE,

	ATA_CMD_MEDIA_UNLOCK	= 0xDF,

	ATA_CMD_DSM		= 0x06,

	/* marked obsolete in the ATA/ATAPI-7 spec */

	ATA_CMD_RESTORE		= 0x10,
@@ -321,6 +325,9 @@ enum { 
	ATA_SMART_READ_VALUES	= 0xD0,

	ATA_SMART_READ_THRESHOLDS = 0xD1,



	/* feature values for Data Set Management */

	ATA_DSM_TRIM		= 0x01,



	/* password used in LBA Mid / LBA High for executing SMART commands */

	ATA_SMART_LBAM_PASS	= 0x4F,

	ATA_SMART_LBAH_PASS	= 0xC2,
@@ -723,6 +730,14 @@ static inline int ata_id_has_unload(const u16 *id) 
	return 0;

}



static inline int ata_id_has_trim(const u16 *id)

{

	if (ata_id_major_version(id) >= 7 &&

	    (id[ATA_ID_DATA_SET_MGMT] & 1))

		return 1;

	return 0;

}



static inline int ata_id_current_chs_valid(const u16 *id)

{

	/* For ATA-1 devices, if the INITIALIZE DEVICE PARAMETERS command
@@ -863,6 +878,32 @@ static inline void ata_id_to_hd_driveid(u16 *id) 
#endif

}



/*

 * Write up to 'max' LBA Range Entries to the buffer that will cover the

 * extent from sector to sector + count.  This is used for TRIM and for

 * ADD LBA(S) TO NV CACHE PINNED SET.

 */

static inline unsigned ata_set_lba_range_entries(void *_buffer, unsigned max,

						u64 sector, unsigned long count)

{

	__le64 *buffer = _buffer;

	unsigned i = 0;



	while (i < max) {

		u64 entry = sector |

			((u64)(count > 0xffff ? 0xffff : count) << 48);

		buffer[i++] = __cpu_to_le64(entry);

		if (count <= 0xffff)

			break;

		count -= 0xffff;

		sector += 0xffff;

	}



	max = ALIGN(i * 8, 512);

	memset(buffer + i, 0, max - i * 8);

	return max;

}



static inline int is_multi_taskfile(struct ata_taskfile *tf)

{

	return (tf->command == ATA_CMD_READ_MULTI) ||