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ata: Add TRIM infrastructure

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This is common code shared between the IDE and libata implementations

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Matthew Wilcox 2009-04-02 10:37:25 -04:00 • committed by Jeff Garzik
parent c3f93b8fc6
commit 0c659b82d1
1 changed files with 41 additions and 0 deletions
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41
include/linux/ata.h
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@ -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) ||