PCI: show dma_mask bits in /sys
So we can catch if the driver sets an incorrect dma_mask.
Reviewed-by: Grant Grundler <grundler@google.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 0fa707e..c5df94e 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -184,6 +184,21 @@
#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);
@@ -314,6 +329,8 @@
#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),