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Commit 59db8102 authored by David S. Miller's avatar David S. Miller
Browse files

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



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: default avatarDavid S. Miller <davem@davemloft.net>
parent a1aadd55

arch/sparc64/kernel/pci_sun4v.c

+10 −26
Original line number Diff line number Diff line
@@ -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");

	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) {