powerpc: Remove addr_needs_map in struct dma_mapping_ops

This patch adds max_direct_dma_addr to struct dev_archdata to remove
addr_needs_map in struct dma_mapping_ops. It also converts
dma_capable() to use max_direct_dma_addr.

max_direct_dma_addr is initialized in pci_dma_dev_setup_swiotlb(),
called via ppc_md.pci_dma_dev_setup hook.

For further information:
http://marc.info/?t=124719060200001&r=1&w=2

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Becky Bruce <beckyb@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/include/asm/device.h

@@ -16,6 +16,9 @@ struct dev_archdata {
 	/* DMA operations on that device */
 	struct dma_mapping_ops	*dma_ops;
 	void			*dma_data;
+#ifdef CONFIG_SWIOTLB
+	dma_addr_t		max_direct_dma_addr;
+#endif
 };
 
 static inline void dev_archdata_set_node(struct dev_archdata *ad,

arch/powerpc/include/asm/dma-mapping.h

@@ -87,8 +87,6 @@ struct dma_mapping_ops {
 				dma_addr_t dma_address, size_t size,
 				enum dma_data_direction direction,
 				struct dma_attrs *attrs);
-	int		(*addr_needs_map)(struct device *dev, dma_addr_t addr,
-				size_t size);
 #ifdef CONFIG_PPC_NEED_DMA_SYNC_OPS
 	void            (*sync_single_range_for_cpu)(struct device *hwdev,
 				dma_addr_t dma_handle, unsigned long offset,
@@ -426,10 +424,12 @@ static inline int dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
 
 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
 {
-	struct dma_mapping_ops *ops = get_dma_ops(dev);
+#ifdef CONFIG_SWIOTLB
+	struct dev_archdata *sd = &dev->archdata;
 
-	if (ops->addr_needs_map && ops->addr_needs_map(dev, addr, size))
+	if (sd->max_direct_dma_addr && addr + size > sd->max_direct_dma_addr)
 		return 0;
+#endif
 
 	if (!dev->dma_mask)
 		return 0;

arch/powerpc/include/asm/swiotlb.h

@@ -16,12 +16,11 @@
 extern struct dma_mapping_ops swiotlb_dma_ops;
 extern struct dma_mapping_ops swiotlb_pci_dma_ops;
 
-int swiotlb_arch_address_needs_mapping(struct device *, dma_addr_t,
-				       size_t size);
-
 static inline void dma_mark_clean(void *addr, size_t size) {}
 
 extern unsigned int ppc_swiotlb_enable;
 int __init swiotlb_setup_bus_notifier(void);
 
+extern void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev);
+
 #endif /* __ASM_SWIOTLB_H */

arch/powerpc/kernel/dma-swiotlb.c

@@ -24,26 +24,6 @@
 int swiotlb __read_mostly;
 unsigned int ppc_swiotlb_enable;
 
-/*
- * Determine if an address is reachable by a pci device, or if we must bounce.
- */
-static int
-swiotlb_pci_addr_needs_map(struct device *hwdev, dma_addr_t addr, size_t size)
-{
-	dma_addr_t max;
-	struct pci_controller *hose;
-	struct pci_dev *pdev = to_pci_dev(hwdev);
-
-	hose = pci_bus_to_host(pdev->bus);
-	max = hose->dma_window_base_cur + hose->dma_window_size;
-
-	/* check that we're within mapped pci window space */
-	if ((addr + size > max) | (addr < hose->dma_window_base_cur))
-		return 1;
-
-	return 0;
-}
-
 /*
  * At the moment, all platforms that use this code only require
  * swiotlb to be used if we're operating on HIGHMEM.  Since
@@ -73,22 +53,36 @@ struct dma_mapping_ops swiotlb_pci_dma_ops = {
 	.dma_supported = swiotlb_dma_supported,
 	.map_page = swiotlb_map_page,
 	.unmap_page = swiotlb_unmap_page,
-	.addr_needs_map = swiotlb_pci_addr_needs_map,
 	.sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
 	.sync_single_range_for_device = swiotlb_sync_single_range_for_device,
 	.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
 	.sync_sg_for_device = swiotlb_sync_sg_for_device
 };
 
+void pci_dma_dev_setup_swiotlb(struct pci_dev *pdev)
+{
+	struct pci_controller *hose;
+	struct dev_archdata *sd;
+
+	hose = pci_bus_to_host(pdev->bus);
+	sd = &pdev->dev.archdata;
+	sd->max_direct_dma_addr =
+		hose->dma_window_base_cur + hose->dma_window_size;
+}
+
 static int ppc_swiotlb_bus_notify(struct notifier_block *nb,
 				  unsigned long action, void *data)
 {
 	struct device *dev = data;
+	struct dev_archdata *sd;
 
 	/* We are only intereted in device addition */
 	if (action != BUS_NOTIFY_ADD_DEVICE)
 		return 0;
 
+	sd = &dev->archdata;
+	sd->max_direct_dma_addr = 0;
+
 	/* May need to bounce if the device can't address all of DRAM */
 	if (dma_get_mask(dev) < lmb_end_of_DRAM())
 		set_dma_ops(dev, &swiotlb_dma_ops);

arch/powerpc/platforms/85xx/mpc8536_ds.c

@@ -97,6 +97,7 @@ static void __init mpc8536_ds_setup_arch(void)
 	if (lmb_end_of_DRAM() > max) {
 		ppc_swiotlb_enable = 1;
 		set_pci_dma_ops(&swiotlb_pci_dma_ops);
+		ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
 	}
 #endif
 

arch/powerpc/platforms/85xx/mpc85xx_ds.c

@@ -193,6 +193,7 @@ static void __init mpc85xx_ds_setup_arch(void)
 	if (lmb_end_of_DRAM() > max) {
 		ppc_swiotlb_enable = 1;
 		set_pci_dma_ops(&swiotlb_pci_dma_ops);
+		ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
 	}
 #endif
 

arch/powerpc/platforms/85xx/mpc85xx_mds.c

@@ -256,6 +256,7 @@ static void __init mpc85xx_mds_setup_arch(void)
 	if (lmb_end_of_DRAM() > max) {
 		ppc_swiotlb_enable = 1;
 		set_pci_dma_ops(&swiotlb_pci_dma_ops);
+		ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
 	}
 #endif
 }

arch/powerpc/platforms/86xx/mpc86xx_hpcn.c

@@ -106,6 +106,7 @@ mpc86xx_hpcn_setup_arch(void)
 	if (lmb_end_of_DRAM() > max) {
 		ppc_swiotlb_enable = 1;
 		set_pci_dma_ops(&swiotlb_pci_dma_ops);
+		ppc_md.pci_dma_dev_setup = pci_dma_dev_setup_swiotlb;
 	}
 #endif
 }