@@ -130,9 +130,18 @@ static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
return phys_to_dma(hwdev, virt_to_phys(address));
}
-void * __weak swiotlb_bus_to_virt(struct device *hwdev, dma_addr_t address)
+static void *swiotlb_bus_to_virt(struct device *hwdev, dma_addr_t address)
{
+#ifdef CONFIG_HIGHMEM
+ unsigned long pfn = PFN_DOWN(dma_to_phys(hwdev, address));
+ void *pageaddr = page_address(pfn_to_page(pfn));
+
+ if (pageaddr != NULL)
+ return pageaddr + (address % PAGE_SIZE);
+ return NULL;
+#else
return phys_to_virt(dma_to_phys(hwdev, address));
+#endif
}
static void swiotlb_print_info(unsigned long bytes)
Rather than supplying a __weak hook which architectures which support highmem can overide simply provide a version of swiotlb_bus_to_virt which works with high memory. Make it conditional since it is a more expensive variant than the non-highmem version. Acutal function contents taken from the PowerPC swiotlb patchset by Becky Bruce. Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Cc: Becky Bruce <beckyb@kernel.crashing.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Ingo Molnar <mingo@elte.hu> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: linuxppc-dev@ozlabs.org --- lib/swiotlb.c | 11 ++++++++++- 1 files changed, 10 insertions(+), 1 deletions(-)