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Intel IOMMU: Intel iommu cmdline option - forcedac

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Introduce intel_iommu=forcedac commandline option.  This option is helpful to
verify the pci device capability of handling physical dma'able address greater
than 4G.

Signed-off-by: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Muli Ben-Yehuda <muli@il.ibm.com>
Cc: "Siddha, Suresh B" <suresh.b.siddha@intel.com>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Keshavamurthy, Anil S
2007-10-21 16:41:53 -07:00
committed by Linus Torvalds
parent eb3fa7cb51
commit 7d3b03ce7b
2 changed files with 13 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/pci/intel-iommu.c
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@ -54,6 +54,7 @@ static void domain_remove_dev_info(struct dmar_domain *domain);
static int dmar_disabled;
static int __initdata dmar_map_gfx = 1;
static int dmar_forcedac;
#define DUMMY_DEVICE_DOMAIN_INFO ((struct device_domain_info *)(-1))
static DEFINE_SPINLOCK(device_domain_lock);
@ -71,6 +72,10 @@ static int __init intel_iommu_setup(char *str)
dmar_map_gfx = 0;
printk(KERN_INFO
"Intel-IOMMU: disable GFX device mapping\n");
} else if (!strncmp(str, "forcedac", 8)) {
printk (KERN_INFO
"Intel-IOMMU: Forcing DAC for PCI devices\n");
dmar_forcedac = 1;
}
str += strcspn(str, ",");
@ -1558,7 +1563,7 @@ static dma_addr_t __intel_map_single(struct device *dev, void *addr,
start_addr = IOVA_START_ADDR;
if (pdev->dma_mask <= DMA_32BIT_MASK) {
if ((pdev->dma_mask <= DMA_32BIT_MASK) || (dmar_forcedac)) {
iova = iommu_alloc_iova(domain, addr, size, start_addr,
pdev->dma_mask);
} else {