korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-16 00:34:20 +08:00
Code Issues Packages Projects Releases Wiki Activity

Fix arm64 regression introduced by limiting the CMA buffer to ZONE_DMA

Browse Source 
on platforms where RAM starts above 4GB (and ZONE_DMA becoming 0).
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.9 (GNU/Linux)
 
 iQIcBAABAgAGBQJTz+NOAAoJEGvWsS0AyF7xmxQP+wYU76kz2mAyroFdVSCAidqc
 k8DgpYDkDRpxWmkoTYYAuLlMbMk6po+HyX+Gz0ZZw2A8c7bnf3+/ljVk7Y88Shs5
 B+uRLrvIb6BCuroM9oGMUxYF5s+jPmBSLvh+jefypSLrffYoGBAbXN2w9M0CP4Uh
 NiUFSNczs/F6Se7uP1vd8PiN6pJxZfWsb2nFKW3Gzi5Oo2x5JR/kLhJXM/9k6ahE
 XAskRjiHE52pfoyiC66ZLvT1PeZ/smz6quaWquoQ/9obwISWPqIRkF5UoMwpuJOY
 n9R4G7BjJH/dD7yYpgMYzANxOYMwKLtSbwJ6YO1iazWXy3t6+aF1ZsfFb7f42Ysw
 Rnpa4OGUCgWqqge+B8j2Zm7nX/TW/HpX/5YKHhTYH4dU/xsHcM4/IR+jkZ91HyJ5
 RVa9SC3wH6OEASxmN4T3pP24pT9IHKR4ckviBrrAskby7QZ1Ud+HPp2lrxdt8R3N
 m/Ee8iUPOA+uZMXYihx2Bb7E5IaMr2Dzk040nzOc+9lOOpgv2iVqgHQ5gme2DRko
 6QX6575IvqTgl4gqiQmpII4Pqu9r0NR2EWYlsLqXsiqnoWBy4ltRdvsZqy4VpP0s
 FIIC1cOXDhiNWHU5Q+QAC4CEnsnMlnb9hfbAfrLOVpyotY7ry27zGx67EdF4h8d0
 4U+HGdmgxDJf9WtAbR0X
 =NrXJ
 -----END PGP SIGNATURE-----

Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fix from Catalin Marinas:
 "Fix arm64 regression introduced by limiting the CMA buffer to ZONE_DMA
  on platforms where RAM starts above 4GB (and ZONE_DMA becoming 0)"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64: Create non-empty ZONE_DMA when DRAM starts above 4GB
This commit is contained in:
Linus Torvalds 2014-07-23 17:47:36 -07:00
commit 98de5ab713
1 changed files with 13 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
arch/arm64/mm/init.c
View File

@ -60,6 +60,17 @@ static int __init early_initrd(char *p)
early_param("initrd", early_initrd);
#endif
/*
* Return the maximum physical address for ZONE_DMA (DMA_BIT_MASK(32)). It
* currently assumes that for memory starting above 4G, 32-bit devices will
* use a DMA offset.
*/
static phys_addr_t max_zone_dma_phys(void)
{
phys_addr_t offset = memblock_start_of_DRAM() & GENMASK_ULL(63, 32);
return min(offset + (1ULL << 32), memblock_end_of_DRAM());
}
static void __init zone_sizes_init(unsigned long min, unsigned long max)
{
struct memblock_region *reg;
@ -70,9 +81,7 @@ static void __init zone_sizes_init(unsigned long min, unsigned long max)
/* 4GB maximum for 32-bit only capable devices */
if (IS_ENABLED(CONFIG_ZONE_DMA)) {
unsigned long max_dma_phys =
(unsigned long)(dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1);
max_dma = max(min, min(max, max_dma_phys >> PAGE_SHIFT));
max_dma = PFN_DOWN(max_zone_dma_phys());
zone_size[ZONE_DMA] = max_dma - min;
}
zone_size[ZONE_NORMAL] = max - max_dma;
@ -146,7 +155,7 @@ void __init arm64_memblock_init(void)
/* 4GB maximum for 32-bit only capable devices */
if (IS_ENABLED(CONFIG_ZONE_DMA))
dma_phys_limit = dma_to_phys(NULL, DMA_BIT_MASK(32)) + 1;
dma_phys_limit = max_zone_dma_phys();
dma_contiguous_reserve(dma_phys_limit);
memblock_allow_resize();