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-rw-r--r--hw/ide/macio.c131
-rw-r--r--include/hw/ppc/mac_dbdma.h3
2 files changed, 127 insertions, 7 deletions
diff --git a/hw/ide/macio.c b/hw/ide/macio.c
index 2b1e51d49e..18bc1d1273 100644
--- a/hw/ide/macio.c
+++ b/hw/ide/macio.c
@@ -56,11 +56,13 @@ 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);
+ int unaligned;
if (ret < 0) {
m->aiocb = NULL;
qemu_sglist_destroy(&s->sg);
ide_atapi_io_error(s, ret);
+ io->remainder_len = 0;
goto done;
}
@@ -85,7 +87,31 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
s->io_buffer_index &= 0x7ff;
}
- if (s->packet_transfer_size <= 0) {
+ s->io_buffer_size = io->len;
+
+ MACIO_DPRINTF("remainder: %d io->len: %d size: %d\n", io->remainder_len,
+ io->len, s->packet_transfer_size);
+ if (io->remainder_len && io->len) {
+ /* guest wants the rest of its previous transfer */
+ int remainder_len = MIN(io->remainder_len, io->len);
+
+ MACIO_DPRINTF("copying remainder %d bytes\n", remainder_len);
+
+ cpu_physical_memory_write(io->addr, io->remainder + 0x200 -
+ remainder_len, remainder_len);
+
+ io->addr += remainder_len;
+ io->len -= remainder_len;
+ s->io_buffer_size = remainder_len;
+ io->remainder_len -= remainder_len;
+ /* treat remainder as individual transfer, start again */
+ qemu_sglist_init(&s->sg, DEVICE(m), io->len / MACIO_PAGE_SIZE + 1,
+ &address_space_memory);
+ pmac_ide_atapi_transfer_cb(opaque, 0);
+ return;
+ }
+
+ if (!s->packet_transfer_size) {
MACIO_DPRINTF("end of transfer\n");
ide_atapi_cmd_ok(s);
m->dma_active = false;
@@ -98,14 +124,40 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
/* launch next transfer */
- MACIO_DPRINTF("io->len = %#x\n", io->len);
+ /* handle unaligned accesses first, get them over with and only do the
+ remaining bulk transfer using our async DMA helpers */
+ unaligned = io->len & 0x1ff;
+ if (unaligned) {
+ int sector_num = (s->lba << 2) + (s->io_buffer_index >> 9);
+ int nsector = io->len >> 9;
- s->io_buffer_size = io->len;
+ MACIO_DPRINTF("precopying unaligned %d bytes to %#lx\n",
+ unaligned, io->addr + io->len - unaligned);
+
+ bdrv_read(s->bs, sector_num + nsector, io->remainder, 1);
+ cpu_physical_memory_write(io->addr + io->len - unaligned,
+ io->remainder, unaligned);
+
+ io->len -= unaligned;
+ }
+
+ MACIO_DPRINTF("io->len = %#x\n", io->len);
qemu_sglist_init(&s->sg, DEVICE(m), io->len / MACIO_PAGE_SIZE + 1,
&address_space_memory);
qemu_sglist_add(&s->sg, io->addr, io->len);
- io->addr += io->len;
+ io->addr += s->io_buffer_size;
+ io->remainder_len = MIN(s->packet_transfer_size - s->io_buffer_size,
+ (0x200 - unaligned) & 0x1ff);
+ MACIO_DPRINTF("set remainder to: %d\n", io->remainder_len);
+
+ /* We would read no data from the block layer, thus not get a callback.
+ Just fake completion manually. */
+ if (!io->len) {
+ pmac_ide_atapi_transfer_cb(opaque, 0);
+ return;
+ }
+
io->len = 0;
MACIO_DPRINTF("sector_num=%d size=%d, cmd_cmd=%d\n",
@@ -128,14 +180,16 @@ 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);
- int n;
+ int n = 0;
int64_t sector_num;
+ int unaligned;
if (ret < 0) {
MACIO_DPRINTF("DMA error\n");
m->aiocb = NULL;
qemu_sglist_destroy(&s->sg);
ide_dma_error(s);
+ io->remainder_len = 0;
goto done;
}
@@ -158,7 +212,33 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
s->nsector -= n;
}
- if (s->nsector == 0) {
+ MACIO_DPRINTF("remainder: %d io->len: %d nsector: %d sector_num: %ld\n",
+ io->remainder_len, io->len, s->nsector, sector_num);
+ if (io->remainder_len && io->len) {
+ /* guest wants the rest of its previous transfer */
+ int remainder_len = MIN(io->remainder_len, io->len);
+ uint8_t *p = &io->remainder[0x200 - remainder_len];
+
+ MACIO_DPRINTF("copying remainder %d bytes at %#lx\n",
+ remainder_len, io->addr);
+
+ switch (s->dma_cmd) {
+ case IDE_DMA_READ:
+ cpu_physical_memory_write(io->addr, p, remainder_len);
+ break;
+ case IDE_DMA_WRITE:
+ cpu_physical_memory_read(io->addr, p, remainder_len);
+ bdrv_write(s->bs, sector_num - 1, io->remainder, 1);
+ break;
+ case IDE_DMA_TRIM:
+ break;
+ }
+ io->addr += remainder_len;
+ io->len -= remainder_len;
+ io->remainder_len -= remainder_len;
+ }
+
+ if (s->nsector == 0 && !io->remainder_len) {
MACIO_DPRINTF("end of transfer\n");
s->status = READY_STAT | SEEK_STAT;
ide_set_irq(s->bus);
@@ -175,12 +255,49 @@ static void pmac_ide_transfer_cb(void *opaque, int ret)
s->io_buffer_index = 0;
s->io_buffer_size = io->len;
+ /* handle unaligned accesses first, get them over with and only do the
+ remaining bulk transfer using our async DMA helpers */
+ unaligned = io->len & 0x1ff;
+ if (unaligned) {
+ int nsector = io->len >> 9;
+
+ MACIO_DPRINTF("precopying unaligned %d bytes to %#lx\n",
+ unaligned, io->addr + io->len - unaligned);
+
+ switch (s->dma_cmd) {
+ case IDE_DMA_READ:
+ bdrv_read(s->bs, sector_num + nsector, io->remainder, 1);
+ cpu_physical_memory_write(io->addr + io->len - unaligned,
+ io->remainder, unaligned);
+ break;
+ case IDE_DMA_WRITE:
+ /* cache the contents in our io struct */
+ cpu_physical_memory_read(io->addr + io->len - unaligned,
+ io->remainder, unaligned);
+ break;
+ case IDE_DMA_TRIM:
+ break;
+ }
+
+ io->len -= unaligned;
+ }
+
MACIO_DPRINTF("io->len = %#x\n", io->len);
qemu_sglist_init(&s->sg, DEVICE(m), io->len / MACIO_PAGE_SIZE + 1,
&address_space_memory);
qemu_sglist_add(&s->sg, io->addr, io->len);
- io->addr += io->len;
+ io->addr += io->len + unaligned;
+ io->remainder_len = (0x200 - unaligned) & 0x1ff;
+ MACIO_DPRINTF("set remainder to: %d\n", io->remainder_len);
+
+ /* We would read no data from the block layer, thus not get a callback.
+ Just fake completion manually. */
+ if (!io->len) {
+ pmac_ide_transfer_cb(opaque, 0);
+ return;
+ }
+
io->len = 0;
MACIO_DPRINTF("sector_num=%" PRId64 " n=%d, nsector=%d, cmd_cmd=%d\n",
diff --git a/include/hw/ppc/mac_dbdma.h b/include/hw/ppc/mac_dbdma.h
index 4d7318df84..90efd277e4 100644
--- a/include/hw/ppc/mac_dbdma.h
+++ b/include/hw/ppc/mac_dbdma.h
@@ -39,6 +39,9 @@ struct DBDMA_io {
DBDMA_end dma_end;
/* DMA is in progress, don't start another one */
bool processing;
+ /* unaligned last sector of a request */
+ uint8_t remainder[0x200];
+ int remainder_len;
};
/*
generated by cgit v1.2.1 (git 2.18.0) at 2024-05-12 13:03:03 +0000