[SCSI] aacraid: remove x86_64 IOMMU dependent code

This may seem like a DILLIGAF, but after chatting with the F/W folks,
there is no harm in dropping the page calculation as denoted in the
enclosed patch for these older adapters in this new age of 4GB+ memory
sticks. Any resource optimization within the old-old-old adapters for
systems with less than 4G of memory is of little consequence. The
existing AAC_QUIRK_31BIT flag in linit.c should look after the rest of
the legacy hardware DMA limitations.

Signed-off-by: Mark Salyzyn <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 1 insertions, 22 deletions

diff --git a/drivers/scsi/aacraid/comminit.c b/drivers/scsi/aacraid/comminit.c
index 35b0a6ebd3f5..1cd3584ba7ff 100644
--- a/drivers/scsi/aacraid/comminit.c
+++ b/drivers/scsi/aacraid/comminit.c
@@ -92,28 +92,7 @@ static int aac_alloc_comm(struct aac_dev *dev, void **commaddr, unsigned long co
         init->AdapterFibsPhysicalAddress = cpu_to_le32((u32)phys);
         init->AdapterFibsSize = cpu_to_le32(fibsize);
         init->AdapterFibAlign = cpu_to_le32(sizeof(struct hw_fib));
-        /* 
-         * number of 4k pages of host physical memory. The aacraid fw needs
-         * this number to be less than 4gb worth of pages. num_physpages is in
-         * system page units. New firmware doesn't have any issues with the
-         * mapping system, but older Firmware did, and had *troubles* dealing
-         * with the math overloading past 32 bits, thus we must limit this
-         * field.
-         *
-         * This assumes the memory is mapped zero->n, which isnt
-         * always true on real computers. It also has some slight problems
-         * with the GART on x86-64. I've btw never tried DMA from PCI space
-         * on this platform but don't be surprised if its problematic.
-         */
-#ifndef CONFIG_GART_IOMMU
-        if ((num_physpages << (PAGE_SHIFT - 12)) <= AAC_MAX_HOSTPHYSMEMPAGES) {
-                init->HostPhysMemPages = 
-                        cpu_to_le32(num_physpages << (PAGE_SHIFT-12));
-        } else 
-#endif  
-        {
-                init->HostPhysMemPages = cpu_to_le32(AAC_MAX_HOSTPHYSMEMPAGES);
-        }
+        init->HostPhysMemPages = cpu_to_le32(AAC_MAX_HOSTPHYSMEMPAGES);
 
         init->InitFlags = 0;
         if (dev->new_comm_interface) {