Per Andi Kleen's suggestion in the review of our Calgary IOMMU code, I tried to use the alloc_bootmem_nopanic that Andi recently added. Unfortunately, it needs low mem for our translation tables, so we needed a new function to do this. I have updated swiotlb to take advantage of this new function (and added an error path to lib/swiotlb.c and resulting fallout from calling functions). This patch has been tested individually and cumulatively on x86_64 and cross-compile tested on IA64. Since I have no IA64 hardware, any testing on that platform would be appreciated. Thanks, Jon Signed-off-by: Jon Mason <jdmason@xxxxxxxxxx> diff -r b5bb5fea7490 -r 62dc1eb0c5e2 arch/x86_64/kernel/pci-swiotlb.c --- a/arch/x86_64/kernel/pci-swiotlb.c Tue Apr 25 18:18:55 2006 +++ b/arch/x86_64/kernel/pci-swiotlb.c Wed Apr 26 16:12:39 2006 @@ -30,13 +30,19 @@ void pci_swiotlb_init(void) { + int rc; + /* don't initialize swiotlb if iommu=off (no_iommu=1) */ if (!iommu_aperture && !no_iommu && (end_pfn > MAX_DMA32_PFN || force_iommu)) swiotlb = 1; if (swiotlb) { - printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n"); - swiotlb_init(); - dma_ops = &swiotlb_dma_ops; + printk(KERN_INFO "PCI-DMA: Using software bounce buffering for " + "IO (SWIOTLB)\n"); + rc = swiotlb_init(); + if (!rc) + dma_ops = &swiotlb_dma_ops; + else + swiotlb = 0; } } diff -r b5bb5fea7490 -r 62dc1eb0c5e2 include/asm-ia64/machvec.h --- a/include/asm-ia64/machvec.h Tue Apr 25 18:18:55 2006 +++ b/include/asm-ia64/machvec.h Wed Apr 26 16:12:39 2006 @@ -38,7 +38,7 @@ typedef void ia64_mv_migrate_t(struct task_struct * task); /* DMA-mapping interface: */ -typedef void ia64_mv_dma_init (void); +typedef int ia64_mv_dma_init (void); typedef void *ia64_mv_dma_alloc_coherent (struct device *, size_t, dma_addr_t *, gfp_t); typedef void ia64_mv_dma_free_coherent (struct device *, size_t, void *, dma_addr_t); typedef dma_addr_t ia64_mv_dma_map_single (struct device *, void *, size_t, int); diff -r b5bb5fea7490 -r 62dc1eb0c5e2 include/asm-x86_64/swiotlb.h --- a/include/asm-x86_64/swiotlb.h Tue Apr 25 18:18:55 2006 +++ b/include/asm-x86_64/swiotlb.h Wed Apr 26 16:12:39 2006 @@ -41,7 +41,7 @@ extern void swiotlb_free_coherent (struct device *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle); extern int swiotlb_dma_supported(struct device *hwdev, u64 mask); -extern void swiotlb_init(void); +extern int swiotlb_init(void); #ifdef CONFIG_SWIOTLB extern int swiotlb; diff -r b5bb5fea7490 -r 62dc1eb0c5e2 include/linux/bootmem.h --- a/include/linux/bootmem.h Tue Apr 25 18:18:55 2006 +++ b/include/linux/bootmem.h Wed Apr 26 16:12:39 2006 @@ -46,6 +46,7 @@ extern void __init free_bootmem (unsigned long addr, unsigned long size); extern void * __init __alloc_bootmem (unsigned long size, unsigned long align, unsigned long goal); extern void * __init __alloc_bootmem_nopanic (unsigned long size, unsigned long align, unsigned long goal); +extern void * __init __alloc_bootmem_low_nopanic(unsigned long size, unsigned long align, unsigned long goal); extern void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, unsigned long goal); diff -r b5bb5fea7490 -r 62dc1eb0c5e2 lib/swiotlb.c --- a/lib/swiotlb.c Tue Apr 25 18:18:55 2006 +++ b/lib/swiotlb.c Wed Apr 26 16:12:39 2006 @@ -126,7 +126,7 @@ * Statically reserve bounce buffer space and initialize bounce buffer data * structures for the software IO TLB used to implement the DMA API. */ -void +int swiotlb_init(void) { unsigned long i; @@ -140,10 +140,11 @@ /* * Get IO TLB memory from the low pages */ - io_tlb_start = alloc_bootmem_low_pages(io_tlb_nslabs * - (1 << IO_TLB_SHIFT)); + io_tlb_start = __alloc_bootmem_low_nopanic(io_tlb_nslabs * + (1 << IO_TLB_SHIFT), PAGE_SIZE, 0); if (!io_tlb_start) - panic("Cannot allocate SWIOTLB buffer"); + goto nomem_error; + io_tlb_end = io_tlb_start + io_tlb_nslabs * (1 << IO_TLB_SHIFT); /* @@ -152,18 +153,39 @@ * between io_tlb_start and io_tlb_end. */ io_tlb_list = alloc_bootmem(io_tlb_nslabs * sizeof(int)); + if (!io_tlb_list) + goto free_io_tlb_start; + for (i = 0; i < io_tlb_nslabs; i++) io_tlb_list[i] = IO_TLB_SEGSIZE - OFFSET(i, IO_TLB_SEGSIZE); io_tlb_index = 0; io_tlb_orig_addr = alloc_bootmem(io_tlb_nslabs * sizeof(char *)); + if (!io_tlb_orig_addr) + goto free_io_tlb_list; /* * Get the overflow emergency buffer */ io_tlb_overflow_buffer = alloc_bootmem_low(io_tlb_overflow); + if (!io_tlb_overflow_buffer) + goto free_io_tlb_orig_addr; + printk(KERN_INFO "Placing %dMB software IO TLB between 0x%lx - 0x%lx\n", (int) (io_tlb_nslabs * (1 << IO_TLB_SHIFT)) >> 20, virt_to_phys(io_tlb_start), virt_to_phys(io_tlb_end)); + + return 0; + +free_io_tlb_orig_addr: + free_bootmem(__pa(io_tlb_orig_addr), io_tlb_nslabs * sizeof(char *)); +free_io_tlb_list: + free_bootmem(__pa(io_tlb_list), io_tlb_nslabs * sizeof(int)); +free_io_tlb_start: + free_bootmem(__pa(io_tlb_start), io_tlb_nslabs * (1 << IO_TLB_SHIFT)); +nomem_error: + printk(KERN_ERR "SWIOTLB: Unable to allocate memory, disabling " + "IOMMU\n"); + return -ENOMEM; } /* diff -r b5bb5fea7490 -r 62dc1eb0c5e2 mm/bootmem.c --- a/mm/bootmem.c Tue Apr 25 18:18:55 2006 +++ b/mm/bootmem.c Wed Apr 26 16:12:39 2006 @@ -463,3 +463,16 @@ { return __alloc_bootmem_core(pgdat->bdata, size, align, goal, LOW32LIMIT); } + +void * __init __alloc_bootmem_low_nopanic(unsigned long size, + unsigned long align, unsigned long goal) +{ + bootmem_data_t *bdata; + void *ptr; + + list_for_each_entry(bdata, &bdata_list, list) + if ((ptr = __alloc_bootmem_core(bdata, size, align, goal, + LOW32LIMIT))) + return(ptr); + return NULL; +} - : send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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