https://github.com/torvalds/linux
Revision f875db4f20f4ec2e4fa3b3be0e5081976e0b5dad authored by Zhenhua Huang on 07 September 2023, 08:03:56 UTC, committed by Christoph Hellwig on 08 September 2023, 08:58:32 UTC
This reverts commit 3fa6456ebe13adab3ba1817c8e515a5b88f95dce. The Commit broke the CMA region creation through DT on arm64, as showed below logs with "memblock=debug": [ 0.000000] memblock_phys_alloc_range: 41943040 bytes align=0x200000 from=0x0000000000000000 max_addr=0x00000000ffffffff early_init_dt_alloc_reserved_memory_arch+0x34/0xa0 [ 0.000000] memblock_reserve: [0x00000000fd600000-0x00000000ffdfffff] memblock_alloc_range_nid+0xc0/0x19c [ 0.000000] Reserved memory: overlap with other memblock reserved region >From call flow, region we defined in DT was always reserved before entering into rmem_cma_setup. Also, rmem_cma_setup has one routine cma_init_reserved_mem to ensure the region was reserved. Checking the region not reserved here seems not correct. early_init_fdt_scan_reserved_mem: fdt_scan_reserved_mem __reserved_mem_reserve_reg early_init_dt_reserve_memory memblock_reserve(using “reg” prop case) fdt_init_reserved_mem __reserved_mem_alloc_size *early_init_dt_alloc_reserved_memory_arch* memblock_reserve(dynamic alloc case) __reserved_mem_init_node rmem_cma_setup(region overlap check here should always fail) Example DT can be used to reproduce issue: dump_mem: mem_dump_region { compatible = "shared-dma-pool"; alloc-ranges = <0x0 0x00000000 0x0 0xffffffff>; reusable; size = <0 0x2800000>; }; Signed-off-by: Zhenhua Huang <quic_zhenhuah@quicinc.com>
1 parent 765aa6b
Tip revision: f875db4f20f4ec2e4fa3b3be0e5081976e0b5dad authored by Zhenhua Huang on 07 September 2023, 08:03:56 UTC
Revert "dma-contiguous: check for memory region overlap"
Revert "dma-contiguous: check for memory region overlap"
Tip revision: f875db4
File | Mode | Size |
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arch | ||
block | ||
certs | ||
crypto | ||
drivers | ||
fs | ||
include | ||
init | ||
io_uring | ||
ipc | ||
kernel | ||
lib | ||
mm | ||
net | ||
rust | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | -rw-r--r-- | 20.1 KB |
.cocciconfig | -rw-r--r-- | 59 bytes |
.get_maintainer.ignore | -rw-r--r-- | 151 bytes |
.gitattributes | -rw-r--r-- | 105 bytes |
.gitignore | -rw-r--r-- | 2.0 KB |
.mailmap | -rw-r--r-- | 35.3 KB |
.rustfmt.toml | -rw-r--r-- | 369 bytes |
COPYING | -rw-r--r-- | 496 bytes |
CREDITS | -rw-r--r-- | 100.3 KB |
Kbuild | -rw-r--r-- | 2.5 KB |
Kconfig | -rw-r--r-- | 555 bytes |
MAINTAINERS | -rw-r--r-- | 699.9 KB |
Makefile | -rw-r--r-- | 70.0 KB |
README | -rw-r--r-- | 727 bytes |
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