[PATCH] pci: show dma_mask bits in /sys

[Yinghai Lu <yinghai@kernel.org>]

Grant prefer to add it /sys instead of showing in bootlog

so could catch if the driver set the correct dma_mask.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>

---
 drivers/pci/pci-sysfs.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

Index: linux-2.6/drivers/pci/pci-sysfs.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci-sysfs.c
+++ linux-2.6/drivers/pci/pci-sysfs.c
@@ -169,6 +169,21 @@ numa_node_show(struct device *dev, struc
 #endif
 
 static ssize_t
+dma_mask_bits_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+
+	return sprintf (buf, "%d\n", fls64(pdev->dma_mask));
+}
+
+static ssize_t
+consistent_dma_mask_bits_show(struct device *dev, struct device_attribute *attr,
+				 char *buf)
+{
+	return sprintf (buf, "%d\n", fls64(dev->coherent_dma_mask));
+}
+
+static ssize_t
 msi_bus_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);
@@ -223,6 +238,8 @@ struct device_attribute pci_dev_attrs[]
 #ifdef CONFIG_NUMA
 	__ATTR_RO(numa_node),
 #endif
+	__ATTR_RO(dma_mask_bits),
+	__ATTR_RO(consistent_dma_mask_bits),
 	__ATTR(enable, 0600, is_enabled_show, is_enabled_store),
 	__ATTR(broken_parity_status,(S_IRUGO|S_IWUSR),
 		broken_parity_status_show,broken_parity_status_store),