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Merge branch 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 kdump updates from Ingo Molnar:
 "Three kdump robustness related improvements (Joerg Roedel)"

* 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/crash: Allocate enough low memory when crashkernel=high
  x86/swiotlb: Try coherent allocations with __GFP_NOWARN
  swiotlb: Warn on allocation failure in swiotlb_alloc_coherent()
This commit is contained in:
Linus Torvalds 2015-06-22 17:40:55 -07:00
commit e2172d8fd5
3 changed files with 23 additions and 7 deletions
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7
arch/x86/kernel/pci-swiotlb.c
View File

@ -20,6 +20,13 @@ void *x86_swiotlb_alloc_coherent(struct device *hwdev, size_t size,
{
void *vaddr;
/*
* Don't print a warning when the first allocation attempt fails.
* swiotlb_alloc_coherent() will print a warning when the DMA
* memory allocation ultimately failed.
*/
flags |= __GFP_NOWARN;
vaddr = dma_generic_alloc_coherent(hwdev, size, dma_handle, flags,
attrs);
if (vaddr)

12
arch/x86/kernel/setup.c
View File

@ -531,12 +531,14 @@ static void __init reserve_crashkernel_low(void)
if (ret != 0) {
/*
* two parts from lib/swiotlb.c:
* swiotlb size: user specified with swiotlb= or default.
* swiotlb overflow buffer: now is hardcoded to 32k.
* We round it to 8M for other buffers that
* may need to stay low too.
* -swiotlb size: user-specified with swiotlb= or default.
*
* -swiotlb overflow buffer: now hardcoded to 32k. We round it
* to 8M for other buffers that may need to stay low too. Also
* make sure we allocate enough extra low memory so that we
* don't run out of DMA buffers for 32-bit devices.
*/
low_size = swiotlb_size_or_default() + (8UL<<20);
low_size = max(swiotlb_size_or_default() + (8UL<<20), 256UL<<20);
auto_set = true;
} else {
/* passed with crashkernel=0,low ? */

11
lib/swiotlb.c
View File

@ -656,7 +656,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
*/
phys_addr_t paddr = map_single(hwdev, 0, size, DMA_FROM_DEVICE);
if (paddr == SWIOTLB_MAP_ERROR)
return NULL;
goto err_warn;
ret = phys_to_virt(paddr);
dev_addr = phys_to_dma(hwdev, paddr);
@ -670,7 +670,7 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
/* DMA_TO_DEVICE to avoid memcpy in unmap_single */
swiotlb_tbl_unmap_single(hwdev, paddr,
size, DMA_TO_DEVICE);
return NULL;
goto err_warn;
}
}
@ -678,6 +678,13 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
memset(ret, 0, size);
return ret;
err_warn:
pr_warn("swiotlb: coherent allocation failed for device %s size=%zu\n",
dev_name(hwdev), size);
dump_stack();
return NULL;
}
EXPORT_SYMBOL(swiotlb_alloc_coherent);