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Subject[PATCH -mm 02/11] PCI: add device_dma_parameters support
From
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 <fujita.tomonori@lab.ntt.co.jp>
---
drivers/pci/pci.c | 8 ++++++++
drivers/pci/probe.c | 3 +++
include/linux/pci.h | 4 ++++
3 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 71d561f..de97c2b 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1397,6 +1397,14 @@ 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 463a5a9..54edea2 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -985,8 +985,11 @@ 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 5d2281f..f8cba3b 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -152,6 +152,8 @@ 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. */
@@ -556,6 +558,7 @@ 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);
@@ -744,6 +747,7 @@ static inline void pci_set_master(struct pci_dev *dev) { }
static inline int pci_enable_device(struct pci_dev *dev) { return -EIO; }
static inline void pci_disable_device(struct pci_dev *dev) { }
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;}
static inline int __pci_register_driver(struct pci_driver *drv, struct module *owner) { return 0;}
static inline int pci_register_driver(struct pci_driver *drv) { return 0;}
--
1.5.2.4
-
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