From: Pavel Butsykin <pbutsy...@virtuozzo.com>
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.
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.
Signed-off-by: Pavel Butsykin <pbutsy...@virtuozzo.com>
Reviewed-by: Roman Kagan <rka...@virtuozzo.com>
Signed-off-by: Denis V. Lunev <d...@openvz.org>
CC: John Snow <js...@redhat.com>
---
hw/ide/atapi.c | 15 +++++++--------
hw/ide/core.c | 23 ++++++++++-------------
hw/ide/internal.h | 18 ++++++++++++++++++
3 files changed, 35 insertions(+), 21 deletions(-)
diff --git a/hw/ide/atapi.c b/hw/ide/atapi.c
index 8816b38..0d51b44 100644
--- a/hw/ide/atapi.c
+++ b/hw/ide/atapi.c
@@ -375,22 +375,25 @@ static void ide_atapi_cmd_check_status(IDEState *s)
}
/* ATAPI DMA support */
-/* XXX: handle read errors */
static void ide_atapi_cmd_read_dma_cb(void *opaque, int ret)
{
IDEState *s = opaque;
int data_offset, n;
- if (ret < 0) { /* XXX: handle -ESTATESAVE for migration */
+ if (ret < 0) {
if (ret == -ESTATESAVE) {
/*
* This case is not really an error
* but a request to save the state.
*/
+ s->bus->error_status = IDE_RETRY_ATAPI;
return;
+ } else if (ide_handle_rw_error(s, -ret, IDE_RETRY_ATAPI)) {
+ if (s->bus->error_status) {
+ return;
+ }
+ goto eot;
}
- ide_atapi_io_error(s, ret);
- goto eot;
}
if (s->io_buffer_size > 0) {
@@ -488,10 +491,6 @@ static void ide_atapi_cmd_read(IDEState *s, int lba, int
nb_sectors,
}
}
-
-/* Called by *_restart_bh when the transfer function points
- * to ide_atapi_cmd
- */
void ide_atapi_dma_restart(IDEState *s)
{
/*
diff --git a/hw/ide/core.c b/hw/ide/core.c
index 872e11f..6d7533f 100644
--- a/hw/ide/core.c
+++ b/hw/ide/core.c
@@ -56,7 +56,6 @@ 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)
@@ -772,7 +771,7 @@ 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);
@@ -782,8 +781,10 @@ 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);
}
@@ -2533,13 +2534,13 @@ static void ide_restart_bh(void *opaque)
}
}
- if (error_status & IDE_RETRY_DMA) {
+ 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 {
@@ -2547,15 +2548,11 @@ 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();
}
}
diff --git a/hw/ide/internal.h b/hw/ide/internal.h
index dcd8627..2e845d0 100644
--- a/hw/ide/internal.h
+++ b/hw/ide/internal.h
@@ -508,11 +508,27 @@ struct IDEDevice {
/* These are used for the error_status field of IDEBus */
#define IDE_RETRY_DMA 0x08
#define IDE_RETRY_PIO 0x10
+#define IDE_RETRY_ATAPI 0x20 /* reused IDE_RETRY_READ bit */
#define IDE_RETRY_READ 0x20
#define IDE_RETRY_FLUSH 0x40
#define IDE_RETRY_TRIM 0x80
#define IDE_RETRY_HBA 0x100
+#define IS_IDE_RETRY_DMA(_status) \
+ ((_status) & IDE_RETRY_DMA)
+
+#define IS_IDE_RETRY_PIO(_status) \
+ ((_status) & IDE_RETRY_PIO)
+
+/*
+ * The method of the IDE_RETRY_ATAPI determination is to use a previously
+ * impossible bit combination as a new status value.
+ */
+#define IS_IDE_RETRY_ATAPI(_status) \
+ (((_status) & IDE_RETRY_ATAPI) && \
+ !IS_IDE_RETRY_DMA(_status) && \
+ !IS_IDE_RETRY_PIO(_status))
+
/*
* a code to trigger entering error path and save/restore the "ready to DMA"
* state just like DMA-ing state. (Ab)use EINPROGRESS as it's not supposed to
@@ -604,4 +620,6 @@ void ide_bus_new(IDEBus *idebus, size_t idebus_size,
DeviceState *dev,
int bus_id, int max_units);
IDEDevice *ide_create_drive(IDEBus *bus, int unit, DriveInfo *drive);
+int ide_handle_rw_error(IDEState *s, int error, int op);
+
#endif /* HW_IDE_INTERNAL_H */
--
2.1.4
