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[IA64] more robust zx1/sx1000 machvec support

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Machine vector selection has always been a bit of a hack given how
early in system boot it needs to be done.  Services like ACPI namespace
are not available and there are non-trivial problems to moving them to
early boot.  However, there's no reason we can't change to a different
machvec later in boot when the services we need are available.  By
adding a entry point for later initialization of the swiotlb, we can add
an error path for the hpzx1 machevec initialization and fall back to the
DIG machine vector if IOMMU hardware isn't found in the system.  Since
ia64 uses 4GB for zone DMA (no ISA support), it's trivial to allocate a
contiguous range from the slab for bounce buffer usage.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Alex Williamson
2005-09-06 11:20:49 -06:00
committed by Tony Luck
parent 1619cca292
commit 0b9afede3d
5 changed files with 157 additions and 29 deletions
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13
arch/ia64/hp/common/hwsw_iommu.c
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@@ -17,7 +17,7 @@
#include <asm/machvec.h>
/* swiotlb declarations & definitions: */
extern void swiotlb_init_with_default_size (size_t size);
extern int swiotlb_late_init_with_default_size (size_t size);
extern ia64_mv_dma_alloc_coherent swiotlb_alloc_coherent;
extern ia64_mv_dma_free_coherent swiotlb_free_coherent;
extern ia64_mv_dma_map_single swiotlb_map_single;
@@ -67,7 +67,16 @@ void
hwsw_init (void)
{
/* default to a smallish 2MB sw I/O TLB */
swiotlb_init_with_default_size (2 * (1<<20));
if (swiotlb_late_init_with_default_size (2 * (1<<20)) != 0) {
#ifdef CONFIG_IA64_GENERIC
/* Better to have normal DMA than panic */
printk(KERN_WARNING "%s: Failed to initialize software I/O TLB,"
" reverting to hpzx1 platform vector\n", __FUNCTION__);
machvec_init("hpzx1");
#else
panic("Unable to initialize software I/O TLB services");
#endif
}
}
void *