iommu: Make sglists and dma_bdrv helpers use new universal DMA helpers

dma-helpers.c contains a number of helper functions for doing
scatter/gather DMA, and various block device related DMA.  Currently,
these directly access guest memory using cpu_physical_memory_*(),
assuming no IOMMU translation.

This patch updates this code to use the new universal DMA helper
functions.  qemu_sglist_init() now takes a DMAContext * to describe
the DMA address space in which the scatter/gather will take place.

We minimally update the callers qemu_sglist_init() to pass NULL
(i.e. no translation, same as current behaviour).  Some of those
callers should pass something else in some cases to allow proper IOMMU
translation in future, but that will be fixed in later patches.

Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 12 insertions, 12 deletions

diff --git a/dma-helpers.c b/dma-helpers.c
index 5265132edf..4c9e529620 100644
--- a/dma-helpers.c
+++ b/dma-helpers.c
@@ -26,12 +26,13 @@ int dma_memory_set(DMAContext *dma, dma_addr_t addr, uint8_t c, dma_addr_t len)
     return 0;
 }
 
-void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint)
+void qemu_sglist_init(QEMUSGList *qsg, int alloc_hint, DMAContext *dma)
 {
     qsg->sg = g_malloc(alloc_hint * sizeof(ScatterGatherEntry));
     qsg->nsg = 0;
     qsg->nalloc = alloc_hint;
     qsg->size = 0;
+    qsg->dma = dma;
 }
 
 void qemu_sglist_add(QEMUSGList *qsg, dma_addr_t base, dma_addr_t len)
@@ -90,10 +91,9 @@ static void dma_bdrv_unmap(DMAAIOCB *dbs)
     int i;
 
     for (i = 0; i < dbs->iov.niov; ++i) {
-        cpu_physical_memory_unmap(dbs->iov.iov[i].iov_base,
-                                  dbs->iov.iov[i].iov_len,
-                                  dbs->dir != DMA_DIRECTION_TO_DEVICE,
-                                  dbs->iov.iov[i].iov_len);
+        dma_memory_unmap(dbs->sg->dma, dbs->iov.iov[i].iov_base,
+                         dbs->iov.iov[i].iov_len, dbs->dir,
+                         dbs->iov.iov[i].iov_len);
     }
     qemu_iovec_reset(&dbs->iov);
 }
@@ -122,7 +122,7 @@ static void dma_complete(DMAAIOCB *dbs, int ret)
 static void dma_bdrv_cb(void *opaque, int ret)
 {
     DMAAIOCB *dbs = (DMAAIOCB *)opaque;
-    target_phys_addr_t cur_addr, cur_len;
+    dma_addr_t cur_addr, cur_len;
     void *mem;
 
     trace_dma_bdrv_cb(dbs, ret);
@@ -139,8 +139,7 @@ static void dma_bdrv_cb(void *opaque, int ret)
     while (dbs->sg_cur_index < dbs->sg->nsg) {
         cur_addr = dbs->sg->sg[dbs->sg_cur_index].base + dbs->sg_cur_byte;
         cur_len = dbs->sg->sg[dbs->sg_cur_index].len - dbs->sg_cur_byte;
-        mem = cpu_physical_memory_map(cur_addr, &cur_len,
-                                      dbs->dir != DMA_DIRECTION_TO_DEVICE);
+        mem = dma_memory_map(dbs->sg->dma, cur_addr, &cur_len, dbs->dir);
         if (!mem)
             break;
         qemu_iovec_add(&dbs->iov, mem, cur_len);
@@ -225,7 +224,8 @@ BlockDriverAIOCB *dma_bdrv_write(BlockDriverState *bs,
 }
 
 
-static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg, bool to_dev)
+static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg,
+                           DMADirection dir)
 {
     uint64_t resid;
     int sg_cur_index;
@@ -236,7 +236,7 @@ static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg, bool to_de
     while (len > 0) {
         ScatterGatherEntry entry = sg->sg[sg_cur_index++];
         int32_t xfer = MIN(len, entry.len);
-        cpu_physical_memory_rw(entry.base, ptr, xfer, !to_dev);
+        dma_memory_rw(sg->dma, entry.base, ptr, xfer, dir);
         ptr += xfer;
         len -= xfer;
         resid -= xfer;
@@ -247,12 +247,12 @@ static uint64_t dma_buf_rw(uint8_t *ptr, int32_t len, QEMUSGList *sg, bool to_de
 
 uint64_t dma_buf_read(uint8_t *ptr, int32_t len, QEMUSGList *sg)
 {
-    return dma_buf_rw(ptr, len, sg, 0);
+    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_FROM_DEVICE);
 }
 
 uint64_t dma_buf_write(uint8_t *ptr, int32_t len, QEMUSGList *sg)
 {
-    return dma_buf_rw(ptr, len, sg, 1);
+    return dma_buf_rw(ptr, len, sg, DMA_DIRECTION_TO_DEVICE);
 }
 
 void dma_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie,