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ahci: correct ncq sector count 

uint16_t isn't enough to hold the real sector count, since a value of
zero implies a full 64K sectors, so we need a uint32_t here.

We *could* cheat and pretend that this value is 0-based and fit it in
a uint16_t, but I'd rather waste 2 bytes instead of a future dev's
10 minutes when they forget to +1/-1 accordingly somewhere.

See SATA 3.2, section 13.6.4.1 "READ FPDMA QUEUED".

Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1435767578-32743-9-git-send-email-jsnow@redhat.com
This commit is contained in:
John Snow 2015-07-04 02:06:05 -04:00
parent 9364384de0
commit e08a98357b
2 changed files with 6 additions and 3 deletions
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7
hw/ide/ahci.c
View File

@ -1086,8 +1086,11 @@ static void process_ncq_command(AHCIState *s, int port, uint8_t *cmd_fis,
DPRINTF(port, "Warn: Unsupported attempt to use Rebuild Assist\n");
}
ncq_tfs->sector_count = ((uint16_t)ncq_fis->sector_count_high << 8) |
ncq_fis->sector_count_low;
ncq_tfs->sector_count = ((ncq_fis->sector_count_high << 8) |
ncq_fis->sector_count_low);
if (!ncq_tfs->sector_count) {
ncq_tfs->sector_count = 0x10000;
}
size = ncq_tfs->sector_count * 512;
ahci_populate_sglist(ad, &ncq_tfs->sglist, size, 0);

2
hw/ide/ahci.h
View File

@ -256,7 +256,7 @@ typedef struct NCQTransferState {
BlockAIOCB *aiocb;
QEMUSGList sglist;
BlockAcctCookie acct;
uint16_t sector_count;
uint32_t sector_count;
uint64_t lba;
uint8_t tag;
uint8_t cmd;