From 4d57cdfacaa1c207bf4c071f89835e0368766a50 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Mon, 4 Feb 2008 22:27:55 -0800 Subject: [PATCH] iommu sg merging: PCI: add device_dma_parameters support This adds struct device_dma_parameters in struct pci_dev and properly sets up a pointer in struct device. The default max_segment_size is set to 64K, same to the block layer's default value. Signed-off-by: FUJITA Tomonori Mostly-acked-by: Jeff Garzik Cc: James Bottomley Acked-by: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/pci/pci.c | 8 ++++++++ drivers/pci/probe.c | 3 +++ include/linux/pci.h | 9 +++++++++ 3 files changed, 20 insertions(+) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 04aac778246..be97090ddf3 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1451,6 +1451,14 @@ pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask) } #endif +#ifndef HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_SIZE +int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size) +{ + return dma_set_max_seg_size(&dev->dev, size); +} +EXPORT_SYMBOL(pci_set_dma_max_seg_size); +#endif + /** * pcix_get_max_mmrbc - get PCI-X maximum designed memory read byte count * @dev: PCI device to query diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 7f5dab34d31..f47d596d5eb 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -933,8 +933,11 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) set_dev_node(&dev->dev, pcibus_to_node(bus)); dev->dev.dma_mask = &dev->dma_mask; + dev->dev.dma_parms = &dev->dma_parms; dev->dev.coherent_dma_mask = 0xffffffffull; + pci_set_dma_max_seg_size(dev, 65536); + /* Fix up broken headers */ pci_fixup_device(pci_fixup_header, dev); diff --git a/include/linux/pci.h b/include/linux/pci.h index cee75c0ff6e..ba3a7f459da 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -159,6 +159,8 @@ struct pci_dev { this if your device has broken DMA or supports 64-bit transfers. */ + struct device_dma_parameters dma_parms; + pci_power_t current_state; /* Current operating state. In ACPI-speak, this is D0-D3, D0 being fully functional, and D3 being off. */ @@ -580,6 +582,7 @@ void pci_intx(struct pci_dev *dev, int enable); void pci_msi_off(struct pci_dev *dev); int pci_set_dma_mask(struct pci_dev *dev, u64 mask); int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask); +int pci_set_dma_max_seg_size(struct pci_dev *dev, unsigned int size); int pcix_get_max_mmrbc(struct pci_dev *dev); int pcix_get_mmrbc(struct pci_dev *dev); int pcix_set_mmrbc(struct pci_dev *dev, int mmrbc); @@ -822,6 +825,12 @@ static inline int pci_set_dma_mask(struct pci_dev *dev, u64 mask) return -EIO; } +static inline int pci_set_dma_max_seg_size(struct pci_dev *dev, + unsigned int size) +{ + return -EIO; +} + static inline int pci_assign_resource(struct pci_dev *dev, int i) { return -EBUSY; -- 2.41.1