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macio: switch pmac_dma_read() over to new offset/len implementation

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For better handling of unaligned block device accesses.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 1433455177-21243-2-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 22:59:34 +01:00 committed by John Snow
parent 4964e18e49
commit 0389b8f8c7
1 changed files with 42 additions and 64 deletions
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106
hw/ide/macio.c
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@ -52,7 +52,7 @@ static const int debug_macio = 0;
#define MACIO_PAGE_SIZE 4096
static void pmac_dma_read(BlockBackend *blk,
int64_t sector_num, int nb_sectors,
int64_t offset, unsigned int bytes,
void (*cb)(void *opaque, int ret), void *opaque)
{
DBDMA_io *io = opaque;
@ -60,76 +60,48 @@ static void pmac_dma_read(BlockBackend *blk,
IDEState *s = idebus_active_if(&m->bus);
dma_addr_t dma_addr, dma_len;
void *mem;
int nsector, remainder;
int64_t sector_num;
int nsector;
uint64_t align = BDRV_SECTOR_SIZE;
size_t head_bytes, tail_bytes;
qemu_iovec_destroy(&io->iov);
qemu_iovec_init(&io->iov, io->len / MACIO_PAGE_SIZE + 1);
if (io->remainder_len > 0) {
/* Return remainder of request */
int transfer = MIN(io->remainder_len, io->len);
sector_num = (offset >> 9);
nsector = (io->len >> 9);
MACIO_DPRINTF("--- DMA read pop - bounce addr: %p addr: %"
HWADDR_PRIx " remainder_len: %x\n",
&io->remainder + (0x200 - transfer), io->addr,
io->remainder_len);
cpu_physical_memory_write(io->addr,
&io->remainder + (0x200 - transfer),
transfer);
io->remainder_len -= transfer;
io->len -= transfer;
io->addr += transfer;
s->io_buffer_index += transfer;
s->io_buffer_size -= transfer;
if (io->remainder_len != 0) {
/* Still waiting for remainder */
return;
}
if (io->len == 0) {
MACIO_DPRINTF("--- finished all read processing; go and finish\n");
cb(opaque, 0);
return;
}
}
if (s->drive_kind == IDE_CD) {
sector_num = (int64_t)(s->lba << 2) + (s->io_buffer_index >> 9);
} else {
sector_num = ide_get_sector(s) + (s->io_buffer_index >> 9);
}
nsector = ((io->len + 0x1ff) >> 9);
remainder = (nsector << 9) - io->len;
MACIO_DPRINTF("--- DMA read transfer - addr: %" HWADDR_PRIx " len: %x\n",
io->addr, io->len);
MACIO_DPRINTF("--- DMA read transfer (0x%" HWADDR_PRIx ",0x%x): "
"sector_num: %" PRId64 ", nsector: %d\n", io->addr, io->len,
sector_num, nsector);
dma_addr = io->addr;
dma_len = io->len;
mem = dma_memory_map(&address_space_memory, dma_addr, &dma_len,
DMA_DIRECTION_FROM_DEVICE);
if (!remainder) {
MACIO_DPRINTF("--- DMA read aligned - addr: %" HWADDR_PRIx
" len: %x\n", io->addr, io->len);
qemu_iovec_add(&io->iov, mem, io->len);
} else {
MACIO_DPRINTF("--- DMA read unaligned - addr: %" HWADDR_PRIx
" len: %x\n", io->addr, io->len);
qemu_iovec_add(&io->iov, mem, io->len);
if (offset & (align - 1)) {
head_bytes = offset & (align - 1);
MACIO_DPRINTF("--- DMA read push - bounce addr: %p "
"remainder_len: %x\n",
&io->remainder + 0x200 - remainder, remainder);
qemu_iovec_add(&io->iov, &io->remainder + 0x200 - remainder,
remainder);
MACIO_DPRINTF("--- DMA unaligned head: sector %" PRId64 ", "
"discarding %zu bytes\n", sector_num, head_bytes);
io->remainder_len = remainder;
qemu_iovec_add(&io->iov, &io->remainder, head_bytes);
bytes += offset & (align - 1);
offset = offset & ~(align - 1);
}
qemu_iovec_add(&io->iov, mem, io->len);
if ((offset + bytes) & (align - 1)) {
tail_bytes = (offset + bytes) & (align - 1);
MACIO_DPRINTF("--- DMA unaligned tail: sector %" PRId64 ", "
"discarding bytes %zu\n", sector_num, tail_bytes);
qemu_iovec_add(&io->iov, &io->remainder, align - tail_bytes);
bytes = ROUND_UP(bytes, align);
}
s->io_buffer_size -= io->len;
@ -137,11 +109,11 @@ static void pmac_dma_read(BlockBackend *blk,
io->len = 0;
MACIO_DPRINTF("--- Block read transfer - sector_num: %"PRIx64" "
"nsector: %x\n",
sector_num, nsector);
MACIO_DPRINTF("--- Block read transfer - sector_num: %" PRIx64 " "
"nsector: %x\n", (offset >> 9), (bytes >> 9));
m->aiocb = blk_aio_readv(blk, sector_num, &io->iov, nsector, cb, io);
m->aiocb = blk_aio_readv(blk, (offset >> 9), &io->iov, (bytes >> 9),
cb, io);
}
static void pmac_dma_write(BlockBackend *blk,
@ -246,6 +218,7 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
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);
@ -294,10 +267,13 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
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, sector_num, nsector, pmac_ide_atapi_transfer_cb, io);
pmac_dma_read(s->blk, offset, io->len, pmac_ide_atapi_transfer_cb, io);
return;
done:
@ -315,6 +291,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
IDEState *s = idebus_active_if(&m->bus);
int64_t sector_num;
int nsector, remainder;
int64_t offset;
MACIO_DPRINTF("pmac_ide_transfer_cb\n");
@ -349,6 +326,7 @@ 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;
@ -359,7 +337,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
switch (s->dma_cmd) {
case IDE_DMA_READ:
pmac_dma_read(s->blk, sector_num, nsector, pmac_ide_transfer_cb, io);
pmac_dma_read(s->blk, offset, io->len, pmac_ide_transfer_cb, io);
break;
case IDE_DMA_WRITE:
pmac_dma_write(s->blk, sector_num, nsector, pmac_ide_transfer_cb, io);