In allwinner_sdhost_process_desc() we just read directly from
guest memory into a host TransferDescriptor struct and back.
This only works on little-endian hosts. Abstract the reading
and writing of descriptors into functions that handle the
byte-swapping so that TransferDescriptor structs as seen by
the rest of the code are always in host-order.
This fixes a failure of one of the avocado tests on s390.
Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
hw/sd/allwinner-sdhost.c | 31 ++++++++++++++++++++++++++-----
1 file changed, 26 insertions(+), 5 deletions(-)
diff --git a/hw/sd/allwinner-sdhost.c b/hw/sd/allwinner-sdhost.c
index 51e5e908307..92a0f42708d 100644
--- a/hw/sd/allwinner-sdhost.c
+++ b/hw/sd/allwinner-sdhost.c
@@ -302,6 +302,30 @@ static void allwinner_sdhost_auto_stop(AwSdHostState *s)
}
}
+static void read_descriptor(AwSdHostState *s, hwaddr desc_addr,
+ TransferDescriptor *desc)
+{
+ uint32_t desc_words[4];
+ dma_memory_read(&s->dma_as, desc_addr, &desc_words, sizeof(desc_words),
+ MEMTXATTRS_UNSPECIFIED);
+ desc->status = le32_to_cpu(desc_words[0]);
+ desc->size = le32_to_cpu(desc_words[1]);
+ desc->addr = le32_to_cpu(desc_words[2]);
+ desc->next = le32_to_cpu(desc_words[3]);
+}
+
+static void write_descriptor(AwSdHostState *s, hwaddr desc_addr,
+ const TransferDescriptor *desc)
+{
+ uint32_t desc_words[4];
+ desc_words[0] = cpu_to_le32(desc->status);
+ desc_words[1] = cpu_to_le32(desc->size);
+ desc_words[2] = cpu_to_le32(desc->addr);
+ desc_words[3] = cpu_to_le32(desc->next);
+ dma_memory_write(&s->dma_as, desc_addr, &desc_words, sizeof(desc_words),
+ MEMTXATTRS_UNSPECIFIED);
+}
+
static uint32_t allwinner_sdhost_process_desc(AwSdHostState *s,
hwaddr desc_addr,
TransferDescriptor *desc,
@@ -312,9 +336,7 @@ static uint32_t allwinner_sdhost_process_desc(AwSdHostState
*s,
uint32_t num_bytes = max_bytes;
uint8_t buf[1024];
- /* Read descriptor */
- dma_memory_read(&s->dma_as, desc_addr, desc, sizeof(*desc),
- MEMTXATTRS_UNSPECIFIED);
+ read_descriptor(s, desc_addr, desc);
if (desc->size == 0) {
desc->size = klass->max_desc_size;
} else if (desc->size > klass->max_desc_size) {
@@ -356,8 +378,7 @@ static uint32_t allwinner_sdhost_process_desc(AwSdHostState
*s,
/* Clear hold flag and flush descriptor */
desc->status &= ~DESC_STATUS_HOLD;
- dma_memory_write(&s->dma_as, desc_addr, desc, sizeof(*desc),
- MEMTXATTRS_UNSPECIFIED);
+ write_descriptor(s, desc_addr, desc);
return num_done;
}