Nick Kossifidis decf89f86e riscv: try to allocate crashkern region from 32bit addressible memory ... When allocating crash kernel region without explicitly specifying its base address/size, memblock_phys_alloc_range will attempt to allocate memory top to bottom (memblock.bottom_up is false), so the crash kernel region will end up in highmem on 64bit systems. This way swiotlb can't work on the crash kernel, since there won't be any 32bit addressible memory available for the bounce buffers. Try to allocate 32bit addressible memory if available, for the crash kernel by restricting the top search address to be less than SZ_4G. If that fails fallback to the previous behavior. I tested this on HiFive Unmatched where the pci-e controller needs swiotlb to work, with this patch it's possible to access the pci-e controller on crash kernel and mount the rootfs from the nvme. Signed-off-by: Nick Kossifidis <mick@ics.forth.gr> Fixes: e53d28180d ("RISC-V: Add kdump support") Cc: stable@vger.kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>		2022-01-09 10:40:14 -08:00
..
cacheflush.c	riscv: Flush current cpu icache before other cpus	2021-10-04 18:24:15 -07:00
context.c	riscv: mm: don't advertise 1 num_asid for 0 asid bits	2021-10-04 14:16:58 -07:00
extable.c	riscv: extable: add a dedicated uaccess handler	2022-01-05 17:53:29 -08:00
fault.c	riscv: Make vmalloc/vmemmap end equal to the start of the next region	2022-01-05 19:22:13 -08:00
hugetlbpage.c	hugetlbfs: remove hugetlb_add_hstate() warning for existing hstate	2020-06-03 20:09:46 -07:00
init.c	riscv: try to allocate crashkern region from 32bit addressible memory	2022-01-09 10:40:14 -08:00
kasan_init.c	riscv: Fix asan-stack clang build	2021-10-29 08:54:50 -07:00
Makefile	riscv: Fixup patch_text panic in ftrace	2021-01-14 15:09:04 -08:00
pageattr.c	RISC-V Patches for the 5.11 Merge Window, Part 1	2020-12-18 10:43:07 -08:00
physaddr.c	riscv: Introduce structure that group all variables regarding kernel mapping	2021-07-05 18:04:00 -07:00
ptdump.c	riscv: Fix PTDUMP output now BPF region moved back to module region	2021-07-06 15:21:27 -07:00
tlbflush.c	riscv: add ASID-based tlbflushing methods	2021-06-30 20:55:39 -07:00