| Message ID | 20200801130856.86625-1-chenzhou10@huawei.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | support reserving crashkernel above 4G on arm64 kdump | expand |
Hi Chen, Thanks for the update. I was busy on other things, I will review your x86/common changes this weekend or early next week. On 08/01/20 at 09:08pm, Chen Zhou wrote: > There are following issues in arm64 kdump: > 1. We use crashkernel=X to reserve crashkernel below 4G, which > will fail when there is no enough low memory. > 2. If reserving crashkernel above 4G, in this case, crash dump > kernel will boot failure because there is no low memory available > for allocation. > 3. Since commit 1a8e1cef7603 ("arm64: use both ZONE_DMA and ZONE_DMA32"), > if the memory reserved for crash dump kernel falled in ZONE_DMA32, > the devices in crash dump kernel need to use ZONE_DMA will alloc > fail. > > To solve these issues, change the behavior of crashkernel=X. > crashkernel=X tries low allocation in ZONE_DMA, and fall back to > high allocation if it fails. > > If requized size X is too large and leads to very little free memory > in ZONE_DMA after low allocation, the system may not work normally. > So add a threshold and go for high allocation directly if the required > size is too large. The value of threshold is set as the half of > the low memory. > > If crash_base is outside ZONE_DMA, try to allocate at least 256M in > ZONE_DMA automatically. "crashkernel=Y,low" can be used to allocate > specified size low memory. > For non-RPi4 platforms, change ZONE_DMA memtioned above to ZONE_DMA32. > > When reserving crashkernel in high memory, some low memory is reserved > for crash dump kernel devices. So there may be two regions reserved for > crash dump kernel, one is below 4G, the other is above 4G. > In order to distinct from the high region and make no effect to the use > of existing kexec-tools, rename the low region as "Crash kernel (low)", > and pass the low region by reusing DT property > "linux,usable-memory-range". We made the low memory region as the last > range of "linux,usable-memory-range" to keep compatibility with existing > user-space and older kdump kernels. > > Besides, we need to modify kexec-tools: > arm64: support more than one crash kernel regions(see [1]) > > Another update is document about DT property 'linux,usable-memory-range': > schemas: update 'linux,usable-memory-range' node schema(see [2]) > > Changes since [v10] > - Reimplement crashkernel=X suggested by Catalin, Many thanks to Catalin. > > Changes since [v9] > - Patch 1 add Acked-by from Dave. > - Update patch 5 according to Dave's comments. > - Update chosen schema. > > Changes since [v8] > - Reuse DT property "linux,usable-memory-range". > Suggested by Rob, reuse DT property "linux,usable-memory-range" to pass the low > memory region. > - Fix kdump broken with ZONE_DMA reintroduced. > - Update chosen schema. > > Changes since [v7] > - Move x86 CRASH_ALIGN to 2M > Suggested by Dave and do some test, move x86 CRASH_ALIGN to 2M. > - Update Documentation/devicetree/bindings/chosen.txt. > Add corresponding documentation to Documentation/devicetree/bindings/chosen.txt > suggested by Arnd. > - Add Tested-by from Jhon and pk. > > Changes since [v6] > - Fix build errors reported by kbuild test robot. > > Changes since [v5] > - Move reserve_crashkernel_low() into kernel/crash_core.c. > - Delete crashkernel=X,high. > - Modify crashkernel=X,low. > If crashkernel=X,low is specified simultaneously, reserve spcified size low > memory for crash kdump kernel devices firstly and then reserve memory above 4G. > In addition, rename crashk_low_res as "Crash kernel (low)" for arm64, and then > pass to crash dump kernel by DT property "linux,low-memory-range". > - Update Documentation/admin-guide/kdump/kdump.rst. > > Changes since [v4] > - Reimplement memblock_cap_memory_ranges for multiple ranges by Mike. > > Changes since [v3] > - Add memblock_cap_memory_ranges back for multiple ranges. > - Fix some compiling warnings. > > Changes since [v2] > - Split patch "arm64: kdump: support reserving crashkernel above 4G" as > two. Put "move reserve_crashkernel_low() into kexec_core.c" in a separate > patch. > > Changes since [v1]: > - Move common reserve_crashkernel_low() code into kernel/kexec_core.c. > - Remove memblock_cap_memory_ranges() i added in v1 and implement that > in fdt_enforce_memory_region(). > There are at most two crash kernel regions, for two crash kernel regions > case, we cap the memory range [min(regs[*].start), max(regs[*].end)] > and then remove the memory range in the middle. > > [1]: http://lists.infradead.org/pipermail/kexec/2020-June/020737.html > [2]: https://github.com/robherring/dt-schema/pull/19 > [v1]: https://lkml.org/lkml/2019/4/2/1174 > [v2]: https://lkml.org/lkml/2019/4/9/86 > [v3]: https://lkml.org/lkml/2019/4/9/306 > [v4]: https://lkml.org/lkml/2019/4/15/273 > [v5]: https://lkml.org/lkml/2019/5/6/1360 > [v6]: https://lkml.org/lkml/2019/8/30/142 > [v7]: https://lkml.org/lkml/2019/12/23/411 > [v8]: https://lkml.org/lkml/2020/5/21/213 > [v9]: https://lkml.org/lkml/2020/6/28/73 > [v10]: https://lkml.org/lkml/2020/7/2/1443 > > Chen Zhou (5): > arm64: kdump: add macro CRASH_ALIGN and CRASH_ADDR_LOW_MAX > x86: kdump: move reserve_crashkernel_low() into crash_core.c > arm64: kdump: reimplement crashkernel=X > arm64: kdump: add memory for devices by DT property > linux,usable-memory-range > kdump: update Documentation about crashkernel > > Documentation/admin-guide/kdump/kdump.rst | 21 +++- > .../admin-guide/kernel-parameters.txt | 11 ++- > arch/arm64/include/asm/kexec.h | 9 ++ > arch/arm64/include/asm/processor.h | 1 + > arch/arm64/kernel/setup.c | 8 +- > arch/arm64/mm/init.c | 99 +++++++++++++++---- > arch/x86/include/asm/kexec.h | 24 +++++ > arch/x86/kernel/setup.c | 86 ++-------------- > include/linux/crash_core.h | 3 + > include/linux/kexec.h | 2 - > kernel/crash_core.c | 74 ++++++++++++++ > kernel/kexec_core.c | 17 ---- > 12 files changed, 233 insertions(+), 122 deletions(-) > > -- > 2.20.1 > > > _______________________________________________ > kexec mailing list > kexec@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/kexec >
There are following issues in arm64 kdump: 1. We use crashkernel=X to reserve crashkernel below 4G, which will fail when there is no enough low memory. 2. If reserving crashkernel above 4G, in this case, crash dump kernel will boot failure because there is no low memory available for allocation. 3. Since commit 1a8e1cef7603 ("arm64: use both ZONE_DMA and ZONE_DMA32"), if the memory reserved for crash dump kernel falled in ZONE_DMA32, the devices in crash dump kernel need to use ZONE_DMA will alloc fail. To solve these issues, change the behavior of crashkernel=X. crashkernel=X tries low allocation in ZONE_DMA, and fall back to high allocation if it fails. If requized size X is too large and leads to very little free memory in ZONE_DMA after low allocation, the system may not work normally. So add a threshold and go for high allocation directly if the required size is too large. The value of threshold is set as the half of the low memory. If crash_base is outside ZONE_DMA, try to allocate at least 256M in ZONE_DMA automatically. "crashkernel=Y,low" can be used to allocate specified size low memory. For non-RPi4 platforms, change ZONE_DMA memtioned above to ZONE_DMA32. When reserving crashkernel in high memory, some low memory is reserved for crash dump kernel devices. So there may be two regions reserved for crash dump kernel, one is below 4G, the other is above 4G. In order to distinct from the high region and make no effect to the use of existing kexec-tools, rename the low region as "Crash kernel (low)", and pass the low region by reusing DT property "linux,usable-memory-range". We made the low memory region as the last range of "linux,usable-memory-range" to keep compatibility with existing user-space and older kdump kernels. Besides, we need to modify kexec-tools: arm64: support more than one crash kernel regions(see [1]) Another update is document about DT property 'linux,usable-memory-range': schemas: update 'linux,usable-memory-range' node schema(see [2]) Changes since [v10] - Reimplement crashkernel=X suggested by Catalin, Many thanks to Catalin. Changes since [v9] - Patch 1 add Acked-by from Dave. - Update patch 5 according to Dave's comments. - Update chosen schema. Changes since [v8] - Reuse DT property "linux,usable-memory-range". Suggested by Rob, reuse DT property "linux,usable-memory-range" to pass the low memory region. - Fix kdump broken with ZONE_DMA reintroduced. - Update chosen schema. Changes since [v7] - Move x86 CRASH_ALIGN to 2M Suggested by Dave and do some test, move x86 CRASH_ALIGN to 2M. - Update Documentation/devicetree/bindings/chosen.txt. Add corresponding documentation to Documentation/devicetree/bindings/chosen.txt suggested by Arnd. - Add Tested-by from Jhon and pk. Changes since [v6] - Fix build errors reported by kbuild test robot. Changes since [v5] - Move reserve_crashkernel_low() into kernel/crash_core.c. - Delete crashkernel=X,high. - Modify crashkernel=X,low. If crashkernel=X,low is specified simultaneously, reserve spcified size low memory for crash kdump kernel devices firstly and then reserve memory above 4G. In addition, rename crashk_low_res as "Crash kernel (low)" for arm64, and then pass to crash dump kernel by DT property "linux,low-memory-range". - Update Documentation/admin-guide/kdump/kdump.rst. Changes since [v4] - Reimplement memblock_cap_memory_ranges for multiple ranges by Mike. Changes since [v3] - Add memblock_cap_memory_ranges back for multiple ranges. - Fix some compiling warnings. Changes since [v2] - Split patch "arm64: kdump: support reserving crashkernel above 4G" as two. Put "move reserve_crashkernel_low() into kexec_core.c" in a separate patch. Changes since [v1]: - Move common reserve_crashkernel_low() code into kernel/kexec_core.c. - Remove memblock_cap_memory_ranges() i added in v1 and implement that in fdt_enforce_memory_region(). There are at most two crash kernel regions, for two crash kernel regions case, we cap the memory range [min(regs[*].start), max(regs[*].end)] and then remove the memory range in the middle. [1]: http://lists.infradead.org/pipermail/kexec/2020-June/020737.html [2]: https://github.com/robherring/dt-schema/pull/19 [v1]: https://lkml.org/lkml/2019/4/2/1174 [v2]: https://lkml.org/lkml/2019/4/9/86 [v3]: https://lkml.org/lkml/2019/4/9/306 [v4]: https://lkml.org/lkml/2019/4/15/273 [v5]: https://lkml.org/lkml/2019/5/6/1360 [v6]: https://lkml.org/lkml/2019/8/30/142 [v7]: https://lkml.org/lkml/2019/12/23/411 [v8]: https://lkml.org/lkml/2020/5/21/213 [v9]: https://lkml.org/lkml/2020/6/28/73 [v10]: https://lkml.org/lkml/2020/7/2/1443 Chen Zhou (5): arm64: kdump: add macro CRASH_ALIGN and CRASH_ADDR_LOW_MAX x86: kdump: move reserve_crashkernel_low() into crash_core.c arm64: kdump: reimplement crashkernel=X arm64: kdump: add memory for devices by DT property linux,usable-memory-range kdump: update Documentation about crashkernel Documentation/admin-guide/kdump/kdump.rst | 21 +++- .../admin-guide/kernel-parameters.txt | 11 ++- arch/arm64/include/asm/kexec.h | 9 ++ arch/arm64/include/asm/processor.h | 1 + arch/arm64/kernel/setup.c | 8 +- arch/arm64/mm/init.c | 99 +++++++++++++++---- arch/x86/include/asm/kexec.h | 24 +++++ arch/x86/kernel/setup.c | 86 ++-------------- include/linux/crash_core.h | 3 + include/linux/kexec.h | 2 - kernel/crash_core.c | 74 ++++++++++++++ kernel/kexec_core.c | 17 ---- 12 files changed, 233 insertions(+), 122 deletions(-)