diff options
| author | David Miller <davem@davemloft.net> | 2007-06-06 22:59:24 -0700 |
|---|---|---|
| committer | Chris Wright <chrisw@sous-sol.org> | 2007-06-11 11:37:14 -0700 |
| commit | 9026337e047f702764920a1e1f68454e87f64f73 (patch) | |
| tree | 628ad3d9c9aa8d80c61a45b1473df9d44323bfd1 /arch | |
| parent | 98ea7818b6c69d9a7e346a75958529e368c6a556 (diff) | |
[PATCH] 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: David S. Miller <davem@davemloft.net>
[chrisw: backport to 2.6.20]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc64/kernel/pci_sun4v.c | 36 |
1 files changed, 10 insertions, 26 deletions
diff --git a/arch/sparc64/kernel/pci_sun4v.c b/arch/sparc64/kernel/pci_sun4v.c index 6b04794b7a9..1153f68ea54 100644 --- a/arch/sparc64/kernel/pci_sun4v.c +++ b/arch/sparc64/kernel/pci_sun4v.c @@ -10,6 +10,7 @@ #include <linux/slab.h> #include <linux/interrupt.h> #include <linux/percpu.h> +#include <linux/log2.h> #include <asm/pbm.h> #include <asm/iommu.h> @@ -994,9 +995,8 @@ static void pci_sun4v_iommu_init(struct pci_pbm_info *pbm) { struct pci_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) { @@ -1010,31 +1010,15 @@ 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]; @@ -1045,7 +1029,7 @@ 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) { |