Commit 7cdd481c authored by Paolo Bonzini's avatar Paolo Bonzini Committed by Kevin Wolf
Browse files

ide: support enable/disable write cache 



Enabling or disabling the write cache is done with the SET FEATURES
command.  The command can be issued with sg_sat_set_features from
sg3-utils.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarKevin Wolf <kwolf@redhat.com>
parent e1e9b0ac

hw/ide/core.c

+18 −3
Original line number Diff line number Diff line
@@ -1047,6 +1047,7 @@ static bool ide_cmd_permitted(IDEState *s, uint32_t cmd) 


void ide_exec_cmd(IDEBus *bus, uint32_t val)

{

    uint16_t *identify_data;

    IDEState *s;

    int n;

    int lba48 = 0;
@@ -1231,10 +1232,21 @@ void ide_exec_cmd(IDEBus *bus, uint32_t val) 
            goto abort_cmd;

        /* XXX: valid for CDROM ? */

        switch(s->feature) {

        case 0xcc: /* reverting to power-on defaults enable */

        case 0x66: /* reverting to power-on defaults disable */

        case 0x02: /* write cache enable */

            bdrv_set_enable_write_cache(s->bs, true);

            identify_data = (uint16_t *)s->identify_data;

            put_le16(identify_data + 85, (1 << 14) | (1 << 5) | 1);

            s->status = READY_STAT | SEEK_STAT;

            ide_set_irq(s->bus);

            break;

        case 0x82: /* write cache disable */

            bdrv_set_enable_write_cache(s->bs, false);

            identify_data = (uint16_t *)s->identify_data;

            put_le16(identify_data + 85, (1 << 14) | 1);

            ide_flush_cache(s);

            break;

        case 0xcc: /* reverting to power-on defaults enable */

        case 0x66: /* reverting to power-on defaults disable */

        case 0xaa: /* read look-ahead enable */

        case 0x55: /* read look-ahead disable */

        case 0x05: /* set advanced power management mode */
@@ -1250,7 +1262,7 @@ void ide_exec_cmd(IDEBus *bus, uint32_t val) 
            break;

        case 0x03: { /* set transfer mode */

		uint8_t val = s->nsector & 0x07;

            uint16_t *identify_data = (uint16_t *)s->identify_data;

		identify_data = (uint16_t *)s->identify_data;



		switch (s->nsector >> 3) {

		case 0x00: /* pio default */
@@ -2146,6 +2158,9 @@ static int ide_drive_post_load(void *opaque, int version_id) 
            s->cdrom_changed = 1;

        }

    }

    if (s->identify_set) {

        bdrv_set_enable_write_cache(s->bs, !!(s->identify_data[85] & (1 << 5)));

    }

    return 0;

}