Hi dave, On Mon, Nov 10, 2014 at 12:47 PM, Dave Young <dyoung at redhat.com> wrote: > On 11/06/14 at 09:43pm, Arun Chandran wrote: >> On Thu, Nov 6, 2014 at 8:58 PM, Mark Rutland <mark.rutland at arm.com> wrote: >> > On Thu, Nov 06, 2014 at 12:16:12PM +0000, Arun Chandran wrote: >> >> Hi Geoff, >> >> >> >> I am trying this on my hardware (apm-mustang.dtb) >> >> >> >> On Fri, Oct 24, 2014 at 4:40 AM, Geoff Levand <geoff at infradead.org> wrote: >> >> > Hi All, >> >> > >> >> > This series adds the core support for kexec re-boots on arm64. I have tested >> >> > with the ARM VE fast model, the ARM Base model and the ARM Foundation >> >> > model with various kernel config options for both the first and second stage >> >> > kernels. >> >> > >> >> > To load a second stage kernel and execute a kexec re-boot on arm64 my patches to >> >> > kexec-tools [2], which have not yet been merged upstream, are needed. >> >> > >> >> > Patches 1-4 rework the arm64 hcall mechanism to give the arm64 soft_restart() >> >> > routine the ability to switch exception levels from EL1 to EL2 for kernels that >> >> > were entered in EL2. >> >> > >> >> > Patches 5 and 6 convert the use of device tree /memreserve/ to device tree >> >> > reserved-memory nodes. >> >> > >> >> > Patch 7 moves proc-macros.S from arm64/mm to arm64/include/asm so that the >> >> > dcache_line_size macro it defines can be uesd by kexec's relocate kernel >> >> > routine. >> >> > >> >> > Patches 8-10 add the actual kexec support. >> >> > >> >> > Please consider all patches for inclusion. Any comments or suggestions on how >> >> > to improve are welcome. >> >> > >> >> > [1] https://git.linaro.org/people/geoff.levand/linux-kexec.git >> >> > [2] https://git.linaro.org/people/geoff.levand/kexec-tools.git >> >> > >> >> > Several things are known to have problems on kexec re-boot: >> >> > >> >> > spin-table >> >> > ---------- >> >> > >> >> > PROBLEM: The spin-table enable method does not implement all the methods needed >> >> > for CPU hot-plug, so the first stage kernel cannot be shutdown properly. >> >> > >> >> > WORK-AROUND: Upgrade to system firmware that provides PSCI enable method >> >> > support, OR build the first stage kernel with CONFIG_SMP=n, OR pass 'maxcpus=1' >> >> > on the first stage kernel command line. >> >> >> >> I have CONFIG_SMP=n >> >> >> >> > >> >> > FIX: Upgrade system firmware to provide PSCI enable method support. >> >> > >> >> > KVM >> >> > --- >> >> > >> >> > PROBLEM: KVM acquires hypervisor resources on startup, but does not free those >> >> > resources on shutdown, so the first stage kernel cannot be shutdown properly. >> >> > >> >> > WORK-AROUND: Build the first stage kernel with CONFIG_KVM=n. >> >> >> >> KVM also disabled. >> >> >> >> /root at genericarmv8:~# usr/local/sbin/kexec --lite -l vmlinux >> >> --dtb=apm-mustang.dtb --command-line= >> >> "root=/dev/nfs rw >> >> nfsroot=10.162.103.145:/nfs_root/linaro-image-lamp-genericarmv8,nfsvers=3 >> >> ip=:::::eth0:dhcp panic=1 console=ttyS0,115200 >> >> earlyprintk=uart8250-32bit,0x1c020000" >> >> >> >> kexec version: 14.10.21.16.36-ga38e0a6 >> >> arch_process_options:85: command_line: root=/dev/nfs rw >> >> nfsroot=10.162.103.145:/nfs_root/linaro-image-lamp-genericarmv8,nfsvers=3 >> >> ip=:::::eth0:dhcp panic=1 console=ttyS0,115200 >> >> earlyprintk=uart8250-32bit,0x1 >> >> c020000 >> >> arch_process_options:87: initrd: (null) >> >> arch_process_options:88: dtb: apm-mustang.dtb >> >> arch_process_options:89: lite: 1 >> >> kernel: 0x7f756e7010 kernel_size: 0x488a308 >> >> Modified cmdline: root=/dev/nfs >> >> Unable to find /proc/device-tree//chosen/linux,stdout-path, printing >> >> from purgatory is diabled >> >> get_memory_ranges_dt:638: node_1516 memory >> >> get_memory_ranges_dt:664: RAM: 0000004000000000 - 0000004400000000 >> >> get_memory_ranges_dt:659: SKIP: 0000000000000000 - 0000000000000000 >> >> get_memory_ranges_dt:659: SKIP: 0000000000000000 - 0000000000000000 >> >> get_memory_ranges_dt:659: SKIP: 0000000000000000 - 0000000000000000 >> >> get_memory_ranges_dt:678: Success >> >> elf_arm64_load: PE format: yes >> >> p_vaddr: ffffffc000080000 >> >> virt_to_phys: ffffffc000080000 -> 0000004000080000 >> >> add_segment_phys_virt: 0000007f756f7010 - 0000007f75d3cf70 (00645f60) >> >> -> 0000004000080000 - 00000040006fb000 (0067b000) >> >> elf_arm64_load: text_offset: 0000000000080000 >> >> elf_arm64_load: image_size: 000000000067f000 >> >> elf_arm64_load: page_offset: ffffffc000000000 >> >> elf_arm64_load: memstart: 0000004000000000 >> >> virt_to_phys: ffffffc000080000 -> 0000004000080000 >> >> elf_arm64_load: e_entry: ffffffc000080000 -> 0000004000080000 >> >> virt_to_phys: ffffffc000080000 -> 0000004000080000 >> >> Modified cmdline:root=/dev/nfs rw >> >> nfsroot=10.162.103.145:/nfs_root/linaro-image-lamp-genericarmv8,nfsvers=3 >> >> ip=:::::eth0:dhcp panic=1 console=ttyS0,115200 >> >> earlyprintk=uart8250-32bit,0x1c020000 >> >> Unable to find /proc/device-tree//chosen/linux,stdout-path, printing >> >> from purgatory is diabled >> >> read_cpu_info: dtb_1 cpu-0 (/cpus/cpu at 000): hwid-0, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_1 cpu-1 (/cpus/cpu at 001): hwid-1, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_1 cpu-2 (/cpus/cpu at 100): hwid-100, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_1 cpu-3 (/cpus/cpu at 101): hwid-101, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_1 cpu-4 (/cpus/cpu at 200): hwid-200, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_1 cpu-5 (/cpus/cpu at 201): hwid-201, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_1 cpu-6 (/cpus/cpu at 300): hwid-300, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_1 cpu-7 (/cpus/cpu at 301): hwid-301, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_2 cpu-0 (/cpus/cpu at 000): hwid-0, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_2 cpu-1 (/cpus/cpu at 001): hwid-1, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_2 cpu-2 (/cpus/cpu at 100): hwid-100, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_2 cpu-3 (/cpus/cpu at 101): hwid-101, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_2 cpu-4 (/cpus/cpu at 200): hwid-200, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_2 cpu-5 (/cpus/cpu at 201): hwid-201, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_2 cpu-6 (/cpus/cpu at 300): hwid-300, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> read_cpu_info: dtb_2 cpu-7 (/cpus/cpu at 301): hwid-301, 'spin-table', >> >> cpu-release-addr 400000fff8 >> >> check_cpu_properties: hwid-0: OK >> >> check_cpu_properties: hwid-1: OK >> >> check_cpu_properties: hwid-100: OK >> >> check_cpu_properties: hwid-101: OK >> >> check_cpu_properties: hwid-200: OK >> >> check_cpu_properties: hwid-201: OK >> >> check_cpu_properties: hwid-300: OK >> >> check_cpu_properties: hwid-301: OK >> >> dtb: base 4000700000, size 221ch (8732) >> >> add_segment_phys_virt: 0000000024c14c90 - 0000000024c16eac (0000221c) >> >> -> 0000004000700000 - 0000004000703000 (00003000) >> >> kexec_load: entry = 0x4000080000 flags = 0xb70000 >> >> nr_segments = 2 >> >> segment[0].buf = 0x7f756f7010 >> >> segment[0].bufsz = 0x645f60 >> >> segment[0].mem = 0x4000080000 >> >> segment[0].memsz = 0x67b000 >> >> segment[1].buf = 0x24c14c90 >> >> segment[1].bufsz = 0x221c >> >> segment[1].mem = 0x4000700000 >> >> segment[1].memsz = 0x3000 >> >> >> >> root at genericarmv8:~# /usr/local/sbin/kexec --lite -e >> >> kexec version: 14.10.21.16.36-ga38e0a6 >> >> arch_process_options:85: command_line: (null) >> >> arch_process_options:87: initrd: (null) >> >> arch_process_options:88: dtb: (null) >> >> arch_process_options:89: lite: 1 >> >> sd 0:0:0:0: [sda] Synchronizing SCSI cache >> >> kexec: Starting new kernel >> >> Bye! >> >> >> >> It fails to come up. In debugger I can see >> >> >> >> Core number : 0 >> >> Core state : debug (AArch64 EL1) >> >> Debug entry cause : External Debug Request >> >> Current PC : 0xffffffc000083200 >> > >> > That's a kernel virtual address, and it looks to be somewhere early in >> > the boot path, given it's close to PAGE_OFFSET + TEXT_OFFSET. >> > >> Yes. My earlyconsole setting was wrong that is why I did not see >> anything in console for the kexec rebooting. >> >> With correct earlycon setting I can see > > Arun, could you share how did you get the working earlycon? We might have > same problem.. I invoked kexec like this root at genericarmv8:~# ./usr/local/sbin/kexec --lite -l vmlinux --command-line= "root=/dev/nfs rw nfsroot=10.162.103.145:/nfs_root/linaro-image-lamp-genericarmv8,nfsvers=3 ip=:::::eth0:dhcp panic=1 console=ttyS0,115200 earlycon=uart8250,mmio32,0x1c020000" Earlier my command line parameters for earlycon was wrong hence I was not getting earlyconsole. Also have a look at http://lists.infradead.org/pipermail/linux-arm-kernel/2014-November/300584.html If your board has an L3 cache; you may have to apply the modification in the above link. --Arun
