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ide: really restart pending and in-flight atapi dma

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Restart of ATAPI DMA used to be unreachable, because the request to do
so wasn't indicated in bus->error_status due to the lack of spare bits, and
ide_restart_bh() would return early doing nothing.

This patch makes use of the observation that not all bit combinations were
possible in ->error_status. In particular, IDE_RETRY_READ only made sense
together with IDE_RETRY_DMA or IDE_RETRY_PIO. This allows to re-use
IDE_RETRY_READ alone as an indicator of ATAPI DMA restart request.

To makes things more uniform, ATAPI DMA gets its own value for ->dma_cmd.
As a means against confusion, macros are added to test the state of
->error_status.

The patch fixes the restart of both in-flight and pending ATAPI DMA,
following the scheme similar to that of IDE DMA.

[Including a fixup patch:
Message-id: 1460465594-15777-1-git-send-email-pbutsykin@virtuozzo.com
--js]

Signed-off-by: Pavel Butsykin <pbutsykin@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 1459924806-306-4-git-send-email-den@openvz.org
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Pavel Butsykin 2016-04-12 18:48:15 -04:00 • committed by John Snow
parent 9a41826f38
commit 502356eeeb
4 changed files with 43 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

30
hw/ide/core.c
View file

@ -57,7 +57,6 @@ static const int smart_attributes[][12] = {
{ 190, 0x03, 0x00, 0x45, 0x45, 0x1f, 0x00, 0x1f, 0x1f, 0x00, 0x00, 0x32},
};
static int ide_handle_rw_error(IDEState *s, int error, int op);
static void ide_dummy_transfer_stop(IDEState *s);
static void padstr(char *str, const char *src, int len)
@ -773,7 +772,7 @@ void ide_dma_error(IDEState *s)
ide_set_irq(s->bus);
}
static int ide_handle_rw_error(IDEState *s, int error, int op)
int ide_handle_rw_error(IDEState *s, int error, int op)
{
bool is_read = (op & IDE_RETRY_READ) != 0;
BlockErrorAction action = blk_get_error_action(s->blk, is_read, error);
@ -783,8 +782,10 @@ static int ide_handle_rw_error(IDEState *s, int error, int op)
s->bus->error_status = op;
} else if (action == BLOCK_ERROR_ACTION_REPORT) {
block_acct_failed(blk_get_stats(s->blk), &s->acct);
if (op & IDE_RETRY_DMA) {
if (IS_IDE_RETRY_DMA(op)) {
ide_dma_error(s);
} else if (IS_IDE_RETRY_ATAPI(op)) {
ide_atapi_io_error(s, -error);
} else {
ide_rw_error(s);
}
@ -872,6 +873,8 @@ static void ide_dma_cb(void *opaque, int ret)
ide_issue_trim, ide_dma_cb, s,
DMA_DIRECTION_TO_DEVICE);
break;
default:
abort();
}
return;
@ -1634,6 +1637,9 @@ static bool cmd_packet(IDEState *s, uint8_t cmd)
s->status = READY_STAT | SEEK_STAT;
s->atapi_dma = s->feature & 1;
if (s->atapi_dma) {
s->dma_cmd = IDE_DMA_ATAPI;
}
s->nsector = 1;
ide_transfer_start(s, s->io_buffer, ATAPI_PACKET_SIZE,
ide_atapi_cmd);
@ -2518,15 +2524,13 @@ static void ide_restart_bh(void *opaque)
if (s->bus->dma->ops->restart) {
s->bus->dma->ops->restart(s->bus->dma);
}
}
if (error_status & IDE_RETRY_DMA) {
} else if (IS_IDE_RETRY_DMA(error_status)) {
if (error_status & IDE_RETRY_TRIM) {
ide_restart_dma(s, IDE_DMA_TRIM);
} else {
ide_restart_dma(s, is_read ? IDE_DMA_READ : IDE_DMA_WRITE);
}
} else if (error_status & IDE_RETRY_PIO) {
} else if (IS_IDE_RETRY_PIO(error_status)) {
if (is_read) {
ide_sector_read(s);
} else {
@ -2534,15 +2538,11 @@ static void ide_restart_bh(void *opaque)
}
} else if (error_status & IDE_RETRY_FLUSH) {
ide_flush_cache(s);
} else if (IS_IDE_RETRY_ATAPI(error_status)) {
assert(s->end_transfer_func == ide_atapi_cmd);
ide_atapi_dma_restart(s);
} else {
/*
* We've not got any bits to tell us about ATAPI - but
* we do have the end_transfer_func that tells us what
* we're trying to do.
*/
if (s->end_transfer_func == ide_atapi_cmd) {
ide_atapi_dma_restart(s);
}
abort();
}
}