mirror of
https://github.com/torvalds/linux.git
synced 2024-12-21 02:21:36 +00:00
79ff56ebd3
Impact: cleanup, reduce kernel size a bit
The current kernel build warns:
WARNING: vmlinux.o(.text+0x11458): Section mismatch in reference from the function swiotlb_alloc_boot() to the function .init.text:__alloc_bootmem_low()
The function swiotlb_alloc_boot() references
the function __init __alloc_bootmem_low().
This is often because swiotlb_alloc_boot lacks a __init
annotation or the annotation of __alloc_bootmem_low is wrong.
WARNING: vmlinux.o(.text+0x1011f2): Section mismatch in reference from the function swiotlb_late_init_with_default_size() to the function .init.text:__alloc_bootmem_low()
The function swiotlb_late_init_with_default_size() references
the function __init __alloc_bootmem_low().
This is often because swiotlb_late_init_with_default_size lacks a __init
annotation or the annotation of __alloc_bootmem_low is wrong.
and indeed the functions calling __alloc_bootmem_low() can be marked
__init as well.
Signed-off-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
92 lines
2.3 KiB
C
92 lines
2.3 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(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(void *ptr, size_t size)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static dma_addr_t
|
|
swiotlb_map_single_phys(struct device *hwdev, phys_addr_t paddr, size_t size,
|
|
int direction)
|
|
{
|
|
return swiotlb_map_single(hwdev, phys_to_virt(paddr), size, direction);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
struct dma_mapping_ops swiotlb_dma_ops = {
|
|
.mapping_error = swiotlb_dma_mapping_error,
|
|
.alloc_coherent = x86_swiotlb_alloc_coherent,
|
|
.free_coherent = swiotlb_free_coherent,
|
|
.map_single = swiotlb_map_single_phys,
|
|
.unmap_single = swiotlb_unmap_single,
|
|
.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,
|
|
.unmap_sg = swiotlb_unmap_sg,
|
|
.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;
|
|
}
|
|
}
|