diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2012-06-06 00:04:54 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2012-06-15 14:03:43 +0200 |
| commit | 7cdd481cdf15d610f83e38f15c7e7979420c6ac0 (patch) | |
| tree | 26db4df9248e2edf182c76428ca2225aaf05784b /hw/ide | |
| parent | e1e9b0aca05747be9e2174a53205bd904c10da49 (diff) | |
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: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'hw/ide')
| -rw-r--r-- | hw/ide/core.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/hw/ide/core.c b/hw/ide/core.c index 9785d5f713..f28229a193 100644 --- a/hw/ide/core.c +++ b/hw/ide/core.c @@ -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; } |