mirror of
https://github.com/torvalds/linux.git
synced 2024-11-08 21:21:47 +00:00
ff6c6fed3a
Impact: reduce kernel size a bit, address sparse warning Addresses the problem pointed out by this sparse warning: arch/x86/kernel/pci-swiotlb.c:53:20: warning: symbol 'swiotlb_dma_ops' was not declared. Should it be static? For x86: swiotlb_dma_ops can be static, because it's not used outside of pci-swiotlb.c Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@gmail.com> Acked-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> LKML-Reference: <1239558861.3938.2.camel@localhost.localdomain> Signed-off-by: Ingo Molnar <mingo@elte.hu>
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/* Glue code to lib/swiotlb.c */
|
|
|
|
#include <linux/pci.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/module.h>
|
|
#include <linux/swiotlb.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/dma-mapping.h>
|
|
|
|
#include <asm/iommu.h>
|
|
#include <asm/swiotlb.h>
|
|
#include <asm/dma.h>
|
|
|
|
int swiotlb __read_mostly;
|
|
|
|
void * __init swiotlb_alloc_boot(size_t size, unsigned long nslabs)
|
|
{
|
|
return alloc_bootmem_low_pages(size);
|
|
}
|
|
|
|
void *swiotlb_alloc(unsigned order, unsigned long nslabs)
|
|
{
|
|
return (void *)__get_free_pages(GFP_DMA | __GFP_NOWARN, order);
|
|
}
|
|
|
|
dma_addr_t swiotlb_phys_to_bus(struct device *hwdev, phys_addr_t paddr)
|
|
{
|
|
return paddr;
|
|
}
|
|
|
|
phys_addr_t swiotlb_bus_to_phys(dma_addr_t baddr)
|
|
{
|
|
return baddr;
|
|
}
|
|
|
|
int __weak swiotlb_arch_range_needs_mapping(phys_addr_t paddr, size_t size)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
|
|
dma_addr_t *dma_handle, gfp_t flags)
|
|
{
|
|
void *vaddr;
|
|
|
|
vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags);
|
|
if (vaddr)
|
|
return vaddr;
|
|
|
|
return swiotlb_alloc_coherent(hwdev, size, dma_handle, flags);
|
|
}
|
|
|
|
static struct dma_map_ops swiotlb_dma_ops = {
|
|
.mapping_error = swiotlb_dma_mapping_error,
|
|
.alloc_coherent = x86_swiotlb_alloc_coherent,
|
|
.free_coherent = swiotlb_free_coherent,
|
|
.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
|
|
.sync_single_for_device = swiotlb_sync_single_for_device,
|
|
.sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
|
|
.sync_single_range_for_device = swiotlb_sync_single_range_for_device,
|
|
.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
|
|
.sync_sg_for_device = swiotlb_sync_sg_for_device,
|
|
.map_sg = swiotlb_map_sg_attrs,
|
|
.unmap_sg = swiotlb_unmap_sg_attrs,
|
|
.map_page = swiotlb_map_page,
|
|
.unmap_page = swiotlb_unmap_page,
|
|
.dma_supported = NULL,
|
|
};
|
|
|
|
void __init pci_swiotlb_init(void)
|
|
{
|
|
/* don't initialize swiotlb if iommu=off (no_iommu=1) */
|
|
#ifdef CONFIG_X86_64
|
|
if (!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN)
|
|
swiotlb = 1;
|
|
#endif
|
|
if (swiotlb_force)
|
|
swiotlb = 1;
|
|
if (swiotlb) {
|
|
printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
|
|
swiotlb_init();
|
|
dma_ops = &swiotlb_dma_ops;
|
|
}
|
|
}
|