From: Will Davis <wda...@nvidia.com>
Lookup the bus address of the resource by finding the parent host bridge,
which may be different than the parent host bridge of the target device.
Signed-off-by: Will Davis <wda...@nvidia.com>
---
arch/x86/kernel/pci-nommu.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index da15918..6384482 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -38,6 +38,37 @@ static dma_addr_t nommu_map_page(struct device *dev, struct
page *page,
return bus;
}
+static dma_addr_t nommu_map_resource(struct device *dev, struct resource *res,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ struct pci_bus *bus;
+ struct pci_host_bridge *bridge;
+ struct resource_entry *window;
+ resource_size_t bus_offset = 0;
+ dma_addr_t dma_address;
+
+ /* Find the parent host bridge of the resource, and determine the
+ * relative offset.
+ */
+ list_for_each_entry(bus, &pci_root_buses, node) {
+ bridge = to_pci_host_bridge(bus->bridge);
+ resource_list_for_each_entry(window, &bridge->windows) {
+ if (resource_contains(window->res, res))
+ bus_offset = window->offset;
+ }
+ }
+
+ dma_address = (res->start - bus_offset) + offset;
+ WARN_ON(size == 0);
+ if (!check_addr("map_resource", dev, dma_address, size))
+ return DMA_ERROR_CODE;
+ flush_write_buffers();
+ return dma_address;
+}
+
+
/* Map a set of buffers described by scatterlist in streaming
* mode for DMA. This is the scatter-gather version of the
* above pci_map_single interface. Here the scatter gather list
@@ -93,6 +124,7 @@ struct dma_map_ops nommu_dma_ops = {
.free = dma_generic_free_coherent,
.map_sg = nommu_map_sg,
.map_page = nommu_map_page,
+ .map_resource = nommu_map_resource,
.sync_single_for_device = nommu_sync_single_for_device,
.sync_sg_for_device = nommu_sync_sg_for_device,
.is_phys = 1,
--
2.4.0
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