On Thu, Feb 3, 2011 at 11:32 PM, Eduard - Gabriel Munteanu
eduard.munte...@linux360.ro wrote:
This introduces replacements for memory access functions like
cpu_physical_memory_read(). The new interface can handle address
translation and access checking through an IOMMU.
Signed-off-by: Eduard - Gabriel Munteanu eduard.munte...@linux360.ro
---
Makefile.target | 2 +-
hw/dma_rw.c | 124 +++
hw/dma_rw.h | 157
+++
3 files changed, 282 insertions(+), 1 deletions(-)
create mode 100644 hw/dma_rw.c
create mode 100644 hw/dma_rw.h
diff --git a/Makefile.target b/Makefile.target
index e15b1c4..e5817ab 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -218,7 +218,7 @@ obj-i386-y += cirrus_vga.o apic.o ioapic.o piix_pci.o
obj-i386-y += vmmouse.o vmport.o hpet.o applesmc.o
obj-i386-y += device-hotplug.o pci-hotplug.o smbios.o wdt_ib700.o
obj-i386-y += debugcon.o multiboot.o
-obj-i386-y += pc_piix.o
+obj-i386-y += pc_piix.o dma_rw.o
obj-i386-$(CONFIG_SPICE) += qxl.o qxl-logger.o qxl-render.o
# shared objects
diff --git a/hw/dma_rw.c b/hw/dma_rw.c
new file mode 100644
index 000..ef8e7f8
--- /dev/null
+++ b/hw/dma_rw.c
@@ -0,0 +1,124 @@
+/*
+ * Generic DMA memory access interface.
+ *
+ * Copyright (c) 2011 Eduard - Gabriel Munteanu
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
copy
+ * of this software and associated documentation files (the Software), to
deal
+ * in the Software without restriction, including without limitation the
rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include dma_rw.h
+#include range.h
+
+static void dma_register_memory_map(DMADevice *dev,
+ dma_addr_t addr,
+ dma_addr_t len,
+ target_phys_addr_t paddr,
+ DMAInvalidateMapFunc *invalidate,
+ void *invalidate_opaque)
+{
+ DMAMemoryMap *map;
+
+ map = qemu_malloc(sizeof(DMAMemoryMap));
+ map-addr = addr;
+ map-len = len;
+ map-paddr = paddr;
+ map-invalidate = invalidate;
+ map-invalidate_opaque = invalidate_opaque;
+
+ QLIST_INSERT_HEAD(dev-mmu-memory_maps, map, list);
+}
+
+static void dma_unregister_memory_map(DMADevice *dev,
+ target_phys_addr_t paddr,
+ dma_addr_t len)
+{
+ DMAMemoryMap *map;
+
+ QLIST_FOREACH(map, dev-mmu-memory_maps, list) {
+ if (map-paddr == paddr map-len == len) {
+ QLIST_REMOVE(map, list);
+ free(map);
+ }
+ }
+}
+
+void dma_invalidate_memory_range(DMADevice *dev,
+ dma_addr_t addr,
+ dma_addr_t len)
+{
+ DMAMemoryMap *map;
+
+ QLIST_FOREACH(map, dev-mmu-memory_maps, list) {
+ if (ranges_overlap(addr, len, map-addr, map-len)) {
+ map-invalidate(map-invalidate_opaque);
+ QLIST_REMOVE(map, list);
+ free(map);
+ }
+ }
+}
+
+void *dma_memory_map(DMADevice *dev,
+ DMAInvalidateMapFunc *cb,
+ void *opaque,
+ dma_addr_t addr,
+ dma_addr_t *len,
+ int is_write)
+{
+ int err;
+ target_phys_addr_t paddr, plen;
+
+ if (!dev || !dev-mmu) {
+ return cpu_physical_memory_map(addr, len, is_write);
+ }
+
+ plen = *len;
+ err = dev-mmu-translate(dev, addr, paddr, plen, is_write);
+ if (err) {
+ return NULL;
+ }
+
+ /*
+ * If this is true, the virtual region is contiguous,
+ * but the translated physical region isn't. We just
+ * clamp *len, much like cpu_physical_memory_map() does.
+ */
+ if (plen *len) {
+ *len = plen;
+ }
+
+ /* We treat maps as remote TLBs to cope with stuff like AIO. */
+
