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dma-debug: add dma_debug_driver kernel command line

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This patch add the dma_debug_driver= boot parameter to enable the driver
filter for early boot.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-05-22 21:49:51 +02:00
parent 8a6fc708b9
commit 1745de5e56
2 changed files with 25 additions and 0 deletions
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7
Documentation/kernel-parameters.txt
View file

@ -646,6 +646,13 @@ and is between 256 and 4096 characters. It is defined in the file
DMA-API debugging code disables itself because the DMA-API debugging code disables itself because the
architectural default is too low. architectural default is too low.
dma_debug_driver=<driver_name>
With this option the DMA-API debugging driver
filter feature can be enabled at boot time. Just
pass the driver to filter for as the parameter.
The filter can be disabled or changed to another
driver later using sysfs.
dscc4.setup= [NET] dscc4.setup= [NET]
dtc3181e= [HW,SCSI] dtc3181e= [HW,SCSI]

18
lib/dma-debug.c
View file

@ -1109,3 +1109,21 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
} }
EXPORT_SYMBOL(debug_dma_sync_sg_for_device); EXPORT_SYMBOL(debug_dma_sync_sg_for_device);
static int __init dma_debug_driver_setup(char *str)
{
int i;
for (i = 0; i < NAME_MAX_LEN - 1; ++i, ++str) {
current_driver_name[i] = *str;
if (*str == 0)
break;
}
if (current_driver_name[0])
printk(KERN_INFO "DMA-API: enable driver filter for "
"driver [%s]\n", current_driver_name);
return 1;
}
__setup("dma_debug_driver=", dma_debug_driver_setup);