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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2009-11-10 19:46:18 +0900
committerIngo Molnar <mingo@elte.hu>2009-11-10 12:31:52 +0100
commit5740afdb68abadc473fd5392df733558a58c1254 (patch)
tree82f87512446607118d48b0e6db9f011abd5e1124 /lib/swiotlb.c
parent9f993ac3f708b661207ed7de521f245586217a68 (diff)
downloadlinux-stericsson-5740afdb68abadc473fd5392df733558a58c1254.tar.gz
swiotlb: Add swiotlb_free() function
swiotlb_free() function frees all allocated memory for swiotlb. We need to initialize swiotlb before IOMMU initialization (x86 and powerpc needs to allocate memory from bootmem allocator). If IOMMU initialization is successful, we need to free swiotlb resource (don't want to waste 64MB). Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: chrisw@sous-sol.org Cc: dwmw2@infradead.org Cc: joerg.roedel@amd.com Cc: muli@il.ibm.com LKML-Reference: <1257849980-22640-8-git-send-email-fujita.tomonori@lab.ntt.co.jp> [ -v2: build fix for the !CONFIG_SWIOTLB case ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'lib/swiotlb.c')
-rw-r--r--lib/swiotlb.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index ac25cd28e807..eee512b63f17 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -97,6 +97,8 @@ static phys_addr_t *io_tlb_orig_addr;
*/
static DEFINE_SPINLOCK(io_tlb_lock);
+static int late_alloc;
+
static int __init
setup_io_tlb_npages(char *str)
{
@@ -262,6 +264,8 @@ swiotlb_late_init_with_default_size(size_t default_size)
swiotlb_print_info(bytes);
+ late_alloc = 1;
+
return 0;
cleanup4:
@@ -281,6 +285,32 @@ cleanup1:
return -ENOMEM;
}
+void __init swiotlb_free(void)
+{
+ if (!io_tlb_overflow_buffer)
+ return;
+
+ if (late_alloc) {
+ free_pages((unsigned long)io_tlb_overflow_buffer,
+ get_order(io_tlb_overflow));
+ free_pages((unsigned long)io_tlb_orig_addr,
+ get_order(io_tlb_nslabs * sizeof(phys_addr_t)));
+ free_pages((unsigned long)io_tlb_list, get_order(io_tlb_nslabs *
+ sizeof(int)));
+ free_pages((unsigned long)io_tlb_start,
+ get_order(io_tlb_nslabs << IO_TLB_SHIFT));
+ } else {
+ free_bootmem_late(__pa(io_tlb_overflow_buffer),
+ io_tlb_overflow);
+ free_bootmem_late(__pa(io_tlb_orig_addr),
+ io_tlb_nslabs * sizeof(phys_addr_t));
+ free_bootmem_late(__pa(io_tlb_list),
+ io_tlb_nslabs * sizeof(int));
+ free_bootmem_late(__pa(io_tlb_start),
+ io_tlb_nslabs << IO_TLB_SHIFT);
+ }
+}
+
static int is_swiotlb_buffer(phys_addr_t paddr)
{
return paddr >= virt_to_phys(io_tlb_start) &&