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>
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@ -51,6 +51,13 @@ static const int debug_macio = 0;
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#define MACIO_PAGE_SIZE 4096
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/*
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* Unaligned DMA read/write access functions required for OS X/Darwin which
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* don't perform DMA transactions on sector boundaries. These functions are
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* modelled on bdrv_co_do_preadv()/bdrv_co_do_pwritev() and so should be
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* easy to remove if the unaligned block APIs are ever exposed.
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*/
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static void pmac_dma_read(BlockBackend *blk,
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int64_t offset, unsigned int bytes,
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void (*cb)(void *opaque, int ret), void *opaque)
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@ -206,20 +213,12 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
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DBDMA_io *io = opaque;
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MACIOIDEState *m = io->opaque;
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IDEState *s = idebus_active_if(&m->bus);
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int64_t sector_num;
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int nsector, remainder;
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int64_t offset;
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MACIO_DPRINTF("\ns is %p\n", s);
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MACIO_DPRINTF("io_buffer_index: %x\n", s->io_buffer_index);
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MACIO_DPRINTF("io_buffer_size: %x packet_transfer_size: %x\n",
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s->io_buffer_size, s->packet_transfer_size);
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MACIO_DPRINTF("lba: %x\n", s->lba);
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MACIO_DPRINTF("io_addr: %" HWADDR_PRIx " io_len: %x\n", io->addr,
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io->len);
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MACIO_DPRINTF("pmac_ide_atapi_transfer_cb\n");
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if (ret < 0) {
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MACIO_DPRINTF("THERE WAS AN ERROR! %d\n", ret);
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MACIO_DPRINTF("DMA error: %d\n", ret);
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ide_atapi_io_error(s, ret);
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goto done;
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}
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@ -233,6 +232,7 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
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}
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if (s->io_buffer_size <= 0) {
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MACIO_DPRINTF("End of IDE transfer\n");
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ide_atapi_cmd_ok(s);
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m->dma_active = false;
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goto done;
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@ -252,22 +252,13 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
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goto done;
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}
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/* Calculate number of sectors */
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sector_num = (int64_t)(s->lba << 2) + (s->io_buffer_index >> 9);
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nsector = (io->len + 0x1ff) >> 9;
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remainder = io->len & 0x1ff;
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/* Calculate current offset */
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offset = (int64_t)(s->lba << 11) + s->io_buffer_index;
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MACIO_DPRINTF("nsector: %d remainder: %x\n", nsector, remainder);
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MACIO_DPRINTF("sector: %"PRIx64" %zx\n", sector_num, io->iov.size / 512);
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pmac_dma_read(s->blk, offset, io->len, pmac_ide_atapi_transfer_cb, io);
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return;
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done:
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MACIO_DPRINTF("done DMA\n\n");
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block_acct_done(blk_get_stats(s->blk), &s->acct);
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io->dma_end(opaque);
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@ -279,14 +270,12 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
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DBDMA_io *io = opaque;
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MACIOIDEState *m = io->opaque;
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IDEState *s = idebus_active_if(&m->bus);
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int64_t sector_num;
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int nsector, remainder;
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int64_t offset;
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MACIO_DPRINTF("pmac_ide_transfer_cb\n");
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if (ret < 0) {
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MACIO_DPRINTF("DMA error\n");
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MACIO_DPRINTF("DMA error: %d\n", ret);
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m->aiocb = NULL;
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ide_dma_error(s);
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io->remainder_len = 0;
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@ -302,7 +291,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
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}
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if (s->io_buffer_size <= 0) {
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MACIO_DPRINTF("end of transfer\n");
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MACIO_DPRINTF("End of IDE transfer\n");
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s->status = READY_STAT | SEEK_STAT;
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ide_set_irq(s->bus);
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m->dma_active = false;
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@ -315,15 +304,7 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
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}
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/* Calculate number of sectors */
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sector_num = ide_get_sector(s) + (s->io_buffer_index >> 9);
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offset = (ide_get_sector(s) << 9) + s->io_buffer_index;
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nsector = (io->len + 0x1ff) >> 9;
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remainder = io->len & 0x1ff;
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s->nsector -= nsector;
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MACIO_DPRINTF("nsector: %d remainder: %x\n", nsector, remainder);
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MACIO_DPRINTF("sector: %"PRIx64" %x\n", sector_num, nsector);
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switch (s->dma_cmd) {
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case IDE_DMA_READ:
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@ -333,7 +314,6 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
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pmac_dma_write(s->blk, offset, io->len, pmac_ide_transfer_cb, io);
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break;
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case IDE_DMA_TRIM:
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MACIO_DPRINTF("TRIM command issued!");
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break;
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}
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@ -537,7 +517,7 @@ static void ide_dbdma_start(IDEDMA *dma, IDEState *s,
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if (s->drive_kind == IDE_CD) {
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s->io_buffer_size = s->packet_transfer_size;
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} else {
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s->io_buffer_size = s->nsector * 0x200;
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s->io_buffer_size = s->nsector * BDRV_SECTOR_SIZE;
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}
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MACIO_DPRINTF("\n\n------------ IDE transfer\n");
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