linux-kernel - [PATCH] pci: show dma

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Date:	Wed, 22 Oct 2008 18:45:10 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Grant Grundler <grundler@...isc-linux.org>,
	Matthew Wilcox <matthew@....cx>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: [PATCH] pci: show dma_mask bits in /sys

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@...nel.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),

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