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[Qemu-devel] [PATCH v3 6/7] ide: support enable/disable write cache
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH v3 6/7] ide: support enable/disable write cache |
Date: |
Wed, 6 Jun 2012 00:04:54 +0200 |
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 <address@hidden>
---
hw/ide/core.c | 21 ++++++++++++++++++---
1 file changed, 18 insertions(+), 3 deletions(-)
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 9785d5f..f28229a 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;
}
--
1.7.10.1
- [Qemu-devel] [PATCH v3 0/7] Manual writethrough cache and cache mode toggle, Paolo Bonzini, 2012/06/05
- [Qemu-devel] [PATCH v3 1/7] block: flush in writethrough mode after writes, Paolo Bonzini, 2012/06/05
- [Qemu-devel] [PATCH v3 2/7] savevm: flush after saving vm state, Paolo Bonzini, 2012/06/05
- [Qemu-devel] [PATCH v3 3/7] block: copy enable_write_cache in bdrv_append, Paolo Bonzini, 2012/06/05
- [Qemu-devel] [PATCH v3 4/7] block: add bdrv_set_enable_write_cache, Paolo Bonzini, 2012/06/05
- [Qemu-devel] [PATCH v3 5/7] block: always open drivers in writeback mode, Paolo Bonzini, 2012/06/05
- [Qemu-devel] [PATCH v3 6/7] ide: support enable/disable write cache,
Paolo Bonzini <=
- [Qemu-devel] [PATCH v3 7/7] qcow2: always operate caches in writeback mode, Paolo Bonzini, 2012/06/05
- Re: [Qemu-devel] [PATCH v3 0/7] Manual writethrough cache and cache mode toggle, Stefan Hajnoczi, 2012/06/08
- Re: [Qemu-devel] [PATCH v3 0/7] Manual writethrough cache and cache mode toggle, Stefan Hajnoczi, 2012/06/08