linux-kernel - [PATCH] pci: print out DMA mask info

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Date:	Wed,  8 Oct 2008 16:02:23 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	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,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH] pci: print out DMA mask info

so can find out what is DMA mask is used for pci devices in addition to
default setting.

got:
ehci_hcd 0000:00:02.1: using 31bit consistent DMA mask
e1000 0000:0b:01.0: using 64bit DMA mask
e1000 0000:0b:01.0: using 64bit consistent DMA mask
e1000e 0000:04:00.0: using 64bit DMA mask
e1000e 0000:04:00.0: using 64bit consistent DMA mask
ixgb 0000:0c:01.0: using 64bit DMA mask
ixgb 0000:0c:01.0: using 64bit consistent DMA mask
aacraid 0000:86:00.0: using 32bit DMA mask
aacraid 0000:86:00.0: using 32bit consistent DMA mask
aacraid 0000:86:00.0: using 64bit DMA mask
aacraid 0000:86:00.0: using 64bit consistent DMA mask
qla2xxx 0000:0c:02.0: using 64bit consistent DMA mask
qla2xxx 0000:0c:02.1: using 64bit consistent DMA mask
lpfc 0000:06:00.0: using 64bit DMA mask
lpfc 0000:06:00.1: using 64bit DMA mask
pata_amd 0000:00:06.0: using 32bit DMA mask
pata_amd 0000:00:06.0: using 32bit consistent DMA mask
mptsas 0000:0c:04.0: using 64bit DMA mask
mptsas 0000:0c:04.0: using 64bit consistent DMA mask

forcedeth 0000:00:08.0: using 39bit DMA mask
forcedeth 0000:00:08.0: using 39bit consistent DMA mask
niu 0000:02:00.0: using 44bit DMA mask
niu 0000:02:00.0: using 44bit consistent DMA mask
sata_nv 0000:00:05.0: using 32bit DMA mask
sata_nv 0000:00:05.0: using 32bit consistent DMA mask
ib_mthca 0000:03:00.0: using 64bit DMA mask
ib_mthca 0000:03:00.0: using 64bit consistent DMA mask

wondering why: qlogic qla2xxx only set consistent to 64bit,
	       emulex lpfc not set consistent to 64bit

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

---
 drivers/pci/pci.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: linux-2.6/drivers/pci/pci.c
===================================================================
--- linux-2.6.orig/drivers/pci/pci.c
+++ linux-2.6/drivers/pci/pci.c
@@ -1660,6 +1660,8 @@ pci_set_dma_mask(struct pci_dev *dev, u6
 		return -EIO;
 
 	dev->dma_mask = mask;
+	dev_printk(KERN_DEBUG, &dev->dev, "using %dbit DMA mask\n",
+		 fls64(mask));
 
 	return 0;
 }
@@ -1671,6 +1673,8 @@ pci_set_consistent_dma_mask(struct pci_d
 		return -EIO;
 
 	dev->dev.coherent_dma_mask = mask;
+	dev_printk(KERN_DEBUG, &dev->dev, "using %dbit consistent DMA mask\n",
+		 fls64(mask));
 
 	return 0;
 }
--
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