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[SPARC64]: Don't be picky about virtual-dma values on sun4v.

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Handle arbitrary base and length values as long as they
are multiples of IO_PAGE_SIZE.

Bug found by Arun Kumar Rao.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-05-23 18:00:46 -07:00
parent a1aadd55fb
commit 59db8102bd
1 changed files with 10 additions and 26 deletions
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36
arch/sparc64/kernel/pci_sun4v.c
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@ -12,6 +12,7 @@
#include <linux/percpu.h>
#include <linux/irq.h>
#include <linux/msi.h>
#include <linux/log2.h>
#include <asm/iommu.h>
#include <asm/irq.h>
@ -638,9 +639,8 @@ static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
{
struct iommu *iommu = pbm->iommu;
struct property *prop;
unsigned long num_tsb_entries, sz;
unsigned long num_tsb_entries, sz, tsbsize;
u32 vdma[2], dma_mask, dma_offset;
int tsbsize;
prop = of_find_property(pbm->prom_node, "virtual-dma", NULL);
if (prop) {
@ -654,31 +654,15 @@ static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
vdma[1] = 0x80000000;
}
dma_mask = vdma[0];
switch (vdma[1]) {
case 0x20000000:
dma_mask |= 0x1fffffff;
tsbsize = 64;
break;
case 0x40000000:
dma_mask |= 0x3fffffff;
tsbsize = 128;
break;
case 0x80000000:
dma_mask |= 0x7fffffff;
tsbsize = 256;
break;
default:
prom_printf("PCI-SUN4V: strange virtual-dma size.\n");
prom_halt();
if ((vdma[0] | vdma[1]) & ~IO_PAGE_MASK) {
prom_printf("PCI-SUN4V: strange virtual-dma[%08x:%08x].\n",
vdma[0], vdma[1]);
prom_halt();
};
tsbsize *= (8 * 1024);
num_tsb_entries = tsbsize / sizeof(iopte_t);
dma_mask = (roundup_pow_of_two(vdma[1]) - 1UL);
num_tsb_entries = vdma[1] / IO_PAGE_SIZE;
tsbsize = num_tsb_entries * sizeof(iopte_t);
dma_offset = vdma[0];
@ -689,7 +673,7 @@ static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm)
iommu->dma_addr_mask = dma_mask;
/* Allocate and initialize the free area map. */
sz = num_tsb_entries / 8;
sz = (num_tsb_entries + 7) / 8;
sz = (sz + 7UL) & ~7UL;
iommu->arena.map = kzalloc(sz, GFP_KERNEL);
if (!iommu->arena.map) {