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    Subject[PATCH 3/5] ata: Add TRIM infrastructure
    Date
    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>
    ---
    include/linux/ata.h | 41 +++++++++++++++++++++++++++++++++++++++++
    1 files changed, 41 insertions(+), 0 deletions(-)

    diff --git a/include/linux/ata.h b/include/linux/ata.h
    index 6617c9f..cb79b7a 100644
    --- a/include/linux/ata.h
    +++ b/include/linux/ata.h
    @@ -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) ||
    --
    1.6.2.1


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