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macio: update comment/constants to reflect the new code 

With the offset/len functions taking care of all of the alignment mapping
in isolation from the DMA tranasaction, many comments are now unnecessary.
Remove these and tidy up a few constants at the same time.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 1433455177-21243-4-git-send-email-mark.cave-ayland@ilande.co.uk
Signed-off-by: John Snow <jsnow@redhat.com>
This commit is contained in:
Mark Cave-Ayland 2015-06-04 22:59:36 +01:00 committed by John Snow
parent ac58fe7b2c
commit b01d44cd06
1 changed files with 13 additions and 33 deletions
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46
hw/ide/macio.c
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@ -51,6 +51,13 @@ static const int debug_macio = 0;
#define MACIO_PAGE_SIZE 4096
/*
* Unaligned DMA read/write access functions required for OS X/Darwin which
* don't perform DMA transactions on sector boundaries. These functions are
* modelled on bdrv_co_do_preadv()/bdrv_co_do_pwritev() and so should be
* easy to remove if the unaligned block APIs are ever exposed.
*/
static void pmac_dma_read(BlockBackend *blk,
int64_t offset, unsigned int bytes,
void (*cb)(void *opaque, int ret), void *opaque)
@ -206,20 +213,12 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
DBDMA_io *io = opaque;
MACIOIDEState *m = io->opaque;
IDEState *s = idebus_active_if(&m->bus);
int64_t sector_num;
int nsector, remainder;
int64_t offset;
MACIO_DPRINTF("\ns is %p\n", s);
MACIO_DPRINTF("io_buffer_index: %x\n", s->io_buffer_index);
MACIO_DPRINTF("io_buffer_size: %x packet_transfer_size: %x\n",
s->io_buffer_size, s->packet_transfer_size);
MACIO_DPRINTF("lba: %x\n", s->lba);
MACIO_DPRINTF("io_addr: %" HWADDR_PRIx " io_len: %x\n", io->addr,
io->len);
MACIO_DPRINTF("pmac_ide_atapi_transfer_cb\n");
if (ret < 0) {
MACIO_DPRINTF("THERE WAS AN ERROR! %d\n", ret);
MACIO_DPRINTF("DMA error: %d\n", ret);
ide_atapi_io_error(s, ret);
goto done;
}
@ -233,6 +232,7 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
}
if (s->io_buffer_size <= 0) {
MACIO_DPRINTF("End of IDE transfer\n");
ide_atapi_cmd_ok(s);
m->dma_active = false;
goto done;
@ -252,22 +252,13 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
goto done;
}
/* Calculate number of sectors */
sector_num = (int64_t)(s->lba << 2) + (s->io_buffer_index >> 9);
nsector = (io->len + 0x1ff) >> 9;
remainder = io->len & 0x1ff;
/* Calculate current offset */
offset = (int64_t)(s->lba << 11) + s->io_buffer_index;
MACIO_DPRINTF("nsector: %d remainder: %x\n", nsector, remainder);
MACIO_DPRINTF("sector: %"PRIx64" %zx\n", sector_num, io->iov.size / 512);
pmac_dma_read(s->blk, offset, io->len, pmac_ide_atapi_transfer_cb, io);
return;
done:
MACIO_DPRINTF("done DMA\n\n");
block_acct_done(blk_get_stats(s->blk), &s->acct);
io->dma_end(opaque);
@ -279,14 +270,12 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
DBDMA_io *io = opaque;
MACIOIDEState *m = io->opaque;
IDEState *s = idebus_active_if(&m->bus);
int64_t sector_num;
int nsector, remainder;
int64_t offset;
MACIO_DPRINTF("pmac_ide_transfer_cb\n");
if (ret < 0) {
MACIO_DPRINTF("DMA error\n");
MACIO_DPRINTF("DMA error: %d\n", ret);
m->aiocb = NULL;
ide_dma_error(s);
io->remainder_len = 0;
@ -302,7 +291,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
}
if (s->io_buffer_size <= 0) {
MACIO_DPRINTF("end of transfer\n");
MACIO_DPRINTF("End of IDE transfer\n");
s->status = READY_STAT | SEEK_STAT;
ide_set_irq(s->bus);
m->dma_active = false;
@ -315,15 +304,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
}
/* Calculate number of sectors */
sector_num = ide_get_sector(s) + (s->io_buffer_index >> 9);
offset = (ide_get_sector(s) << 9) + s->io_buffer_index;
nsector = (io->len + 0x1ff) >> 9;
remainder = io->len & 0x1ff;
s->nsector -= nsector;
MACIO_DPRINTF("nsector: %d remainder: %x\n", nsector, remainder);
MACIO_DPRINTF("sector: %"PRIx64" %x\n", sector_num, nsector);
switch (s->dma_cmd) {
case IDE_DMA_READ:
@ -333,7 +314,6 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
pmac_dma_write(s->blk, offset, io->len, pmac_ide_transfer_cb, io);
break;
case IDE_DMA_TRIM:
MACIO_DPRINTF("TRIM command issued!");
break;
}
@ -537,7 +517,7 @@ static void ide_dbdma_start(IDEDMA *dma, IDEState *s,
if (s->drive_kind == IDE_CD) {
s->io_buffer_size = s->packet_transfer_size;
} else {
s->io_buffer_size = s->nsector * 0x200;
s->io_buffer_size = s->nsector * BDRV_SECTOR_SIZE;
}
MACIO_DPRINTF("\n\n------------ IDE transfer\n");