diff options
| author | Keshavamurthy, Anil S <anil.s.keshavamurthy@intel.com> | 2007-10-21 16:41:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-22 08:13:18 -0700 |
| commit | 7d3b03ce7bff9d39ebaee1bb8de1968c4434b883 (patch) | |
| tree | 0016214c96d2475a160efdd85539242e356ce2d9 /drivers | |
| parent | eb3fa7cb51a2a35cd95eb92e65d8039c779468a5 (diff) | |
Intel IOMMU: Intel iommu cmdline option - forcedac
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/pci/intel-iommu.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index 05630b44dbf..cb24defdb6d 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -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 { |