- 17 Sep, 2019 2 commits
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Ganesh Goudar authored
Since commit 4388c9b3 ("powerpc: Do not send system reset request through the oops path"), pstore dmesg file is not updated when dump is triggered from HMC. This commit modified system reset (sreset) handler to invoke fadump or kdump (if configured), without pushing dmesg to pstore. This leaves pstore to have old dmesg data which won't be much of a help if kdump fails to capture the dump. This patch fixes that by calling kmsg_dump() before heading to fadump ot kdump. Fixes: 4388c9b3 ("powerpc: Do not send system reset request through the oops path") Reviewed-by:
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Reviewed-by:
Nicholas Piggin <npiggin@gmail.com> Signed-off-by:
Ganesh Goudar <ganeshgr@linux.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190904075949.15607-1-ganeshgr@linux.ibm.com
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Adam Zerella authored
The documentation pages for 'elfnote' and 'ultravisor' are not included in the powerpc documentation index, this generates Sphinx warnings: WARNING: document isn't included in any toctree Additionally, when one includes these missing doc pages, more Sphinx warnings appear. Unused footnote references, syntax highlighting and table of content ordering has been adjusted. Signed-off-by:
Adam Zerella <adam.zerella@gmail.com> Signed-off-by:
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- 13 Sep, 2019 38 commits
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Cédric Le Goater authored
When dumping the XIVE state of an CPU IPI, xmon does not check if the CPU is started or not which can cause an error. Add a check for that and change the output to be on one line just as the XIVE interrupts of the machine. Signed-off-by:
Cédric Le Goater <clg@kaod.org> Signed-off-by:
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Cédric Le Goater authored
When looping on the list of interrupts, add the current value of the PQ bits with a load on the ESB page. This has the side effect of faulting the ESB page of all interrupts. Signed-off-by:
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Qian Cai authored
Booting a POWER9 PowerNV system generates a few messages below with "____ptrval____" due to the pointers printed without a specifier extension (i.e unadorned %p) are hashed to prevent leaking information about the kernel memory layout. radix-mmu: Initializing Radix MMU radix-mmu: Partition table (____ptrval____) radix-mmu: Mapped 0x0000000000000000-0x0000000040000000 with 1.00 GiB pages (exec) radix-mmu: Mapped 0x0000000040000000-0x0000002000000000 with 1.00 GiB pages radix-mmu: Mapped 0x0000200000000000-0x0000202000000000 with 1.00 GiB pages radix-mmu: Process table (____ptrval____) and radix root for kernel: (____ptrval____) Signed-off-by:
Qian Cai <cai@lca.pw> Signed-off-by:
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Hari Bathini authored
With support to copy multiple kernel boot memory regions owing to copy size limitation, also handle holes in the memory area to be preserved. Support as many as 128 kernel boot memory regions. This allows having an adequate FADump capture kernel size for different scenarios. Signed-off-by:
Hari Bathini <hbathini@linux.ibm.com> Signed-off-by:
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Hari Bathini authored
RMA_START is defined as '0' and there is even a BUILD_BUG_ON() to make sure it is never anything else. Remove this macro and use '0' instead as code change is needed anyway when it has to be something else. Also, remove unused RMA_END macro. Signed-off-by:
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Hari Bathini authored
With /sys/firmware/opal/core support available on OPAL based machines and an option to the release memory used by kernel in exporting this core file, update FADump documentation with these details. Signed-off-by:
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Hari Bathini authored
OPAL loads kernel & initrd at 512MB offset (256MB size), also exported as ibm,opal/dump/fw-load-area. So, if boot memory size of FADump is less than 768MB, kernel memory to be exported as '/proc/vmcore' would be overwritten by f/w while loading kernel & initrd. To avoid such a scenario, enforce a minimum boot memory size of 768MB on OPAL platform and skip using FADump if a newer F/W version loads kernel & initrd above 768MB. Also, irrespective of RMA size, set the minimum boot memory size expected on pseries platform at 320MB. This is to avoid inflating the minimum memory requirements on systems with 512M/1024M RMA size. Signed-off-by:
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Hari Bathini authored
Writing '1' to /sys/kernel/fadump_release_opalcore would release the memory held by kernel in exporting /sys/firmware/opal/core file. Signed-off-by:
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Hari Bathini authored
Export /sys/firmware/opal/core file to analyze opal crashes. Since OPAL core can be generated independent of CONFIG_FA_DUMP support in kernel, add this support under a new kernel config option CONFIG_OPAL_CORE. Also, avoid code duplication by moving common code used while exporting /proc/vmcore and/or /sys/firmware/opal/core file(s). Signed-off-by:
Hari Bathini <hbathini@linux.vnet.ibm.com> Signed-off-by:
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Hari Bathini authored
Kernel config option CONFIG_PRESERVE_FA_DUMP is introduced to ensure crash data, from previously crash'ed kernel, is preserved. Update documentation with this details. Signed-off-by:
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Hari Bathini authored
Add a new kernel config option, CONFIG_PRESERVE_FA_DUMP that ensures that crash data, from previously crash'ed kernel, is preserved. This helps in cases where FADump is not enabled but the subsequent memory preserving kernel boot is likely to process this crash data. One typical usecase for this config option is petitboot kernel. As OPAL allows registering address with it in the first kernel and retrieving it after MPIPL, use it to store the top of boot memory. A kernel that intends to preserve crash data retrieves it and avoids using memory beyond this address. Move arch_reserved_kernel_pages() function as it is needed for both FA_DUMP and PRESERVE_FA_DUMP configurations. Signed-off-by:
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Hari Bathini authored
The size parameter to fadump_reserve_crash_area() function is not needed as all the memory above boot memory size must be preserved anyway. Update the function by dropping this redundant parameter. Signed-off-by:
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Hari Bathini authored
Commit 0962e800 ("powerpc/prom: Scan reserved-ranges node for memory reservations") enabled support to parse 'reserved-ranges' DT node to reserve kernel memory falling in these ranges for firmware purposes. Along with the preserved area memory, ensure memory in reserved ranges is not overlapped with memory released by capture kernel aftering saving vmcore. Also, fix the off-by-one error in fadump_release_reserved_area function while releasing memory. Signed-off-by:
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Hari Bathini authored
Make allocate_crash_memory_ranges() and free_crash_memory_ranges() functions generic to reuse them for memory management of all types of dynamic memory range arrays. This change helps in memory management of reserved ranges array to be added later. Signed-off-by:
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Hari Bathini authored
Firmware provides architected register state data at the time of crash. Process this data and build CPU notes to append to ELF core. In case this data is missing or in unsupported format, at least append crashing CPU's register data, to have something to work with in the vmcore file. Signed-off-by:
Vasant Hegde <hegdevasant@linux.vnet.ibm.com> Signed-off-by:
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Hari Bathini authored
Earlier, memblock_find_in_range() was not used to find the memory to be reserved for FADump as bottom up allocation mode was not supported. But since commit 79442ed1 ("mm/memblock.c: introduce bottom-up allocation mode") bottom up allocation mode is supported for memblock. So, use it to find the memory to be reserved for FADump. Signed-off-by:
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Hari Bathini authored
With FADump support now available on both pseries and OPAL platforms, update FADump documentation with these details. Signed-off-by:
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Hari Bathini authored
Make OPAL call to indicate that the dump is processed and the metadata area in OPAL can be cleared/released. Also, setup/initialize FADump for re-registration. Signed-off-by:
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Hari Bathini authored
If all kernel boot memory regions are not registered for MPIPL before system crashes, try processing the partial crashdump but warn the user before proceeding. Signed-off-by:
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Hari Bathini authored
Add support in the kernel to process the crash'ed kernel's memory preserved during MPIPL and export it as /proc/vmcore file for the userland scripts to filter and analyze it later. Signed-off-by:
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Hari Bathini authored
Firmware uses a 32-bit field for size while copying/backing-up memory during MPIPL. So, the maximum value that could be represented with a PAGE_SIZE aligned 32-bit field will be the maximum copy size for a region but FADump capture kernel usually needs more memory than that to be preserved to avoid running into out of memory errors. So, request firmware to copy multiple kernel boot memory regions instead of just one (which worked fine for pseries as 64-bit field was used for size there). Signed-off-by:
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Hari Bathini authored
Make OPAL calls to register and un-register with firmware for MPIPL. Signed-off-by:
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Hari Bathini authored
During kexec boot, metadata address needs to be reset to avoid running into errors interpreting stale metadata address, in case the kexec'ed kernel crashes before metadata address could be setup again. Signed-off-by:
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Hari Bathini authored
OPAL allows registering address with it in the first kernel and retrieving it after MPIPL. Setup kernel metadata and register its address with OPAL to use it for processing the crash dump. Signed-off-by:
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Hari Bathini authored
Some code clean-up like using minimal assignments and updating printk messages. Also, add an 'error_out' label for handling error cleanup at one place. Signed-off-by:
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Hari Bathini authored
Add basic callback functions for FADump on PowerNV platform. Signed-off-by:
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Hari Bathini authored
MPIPL is Memory Preserving IPL supported from POWER9. This enables the kernel to reset the system with memory 'preserved'. Also, it supports copying memory from a source address to some destination address during MPIPL boot. Add MPIPL interface definitions here to leverage these f/w features in adding FADump support for PowerNV platform. Signed-off-by:
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Hari Bathini authored
fadump is pronounced f-a-dump. Update documentation accordingly. Also, update how fadump_region contents look like with recent changes. Signed-off-by:
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Hari Bathini authored
Move code that supports processing the crash'ed kernel's memory preserved by firmware to platform specific callback functions. Signed-off-by:
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Hari Bathini authored
Except for Reserved dump area (see Documentation/powerpc/firmware- assisted-dump.rst) which is permanent reserved, all memory above boot memory size, where boot memory size is the memory required for the kernel to boot successfully when booted with restricted memory (memory for capture kernel), is released when the dump is invalidated. Make this a bit more explicit in the code. Signed-off-by:
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Hari Bathini authored
Improve how fadump_region contents are displayed by adding source information of memory regions that are to be dumped by f/w. Signed-off-by:
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Hari Bathini authored
Move platform specific register/un-register code, the RTAS calls, to register/un-register callback functions. This would also mean moving code that initializes and prints the platform specific FADump data. Signed-off-by:
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Hari Bathini authored
Introduce callback functions for platform specific operations like register, unregister, invalidate & such. Also, define place-holders for the same on pSeries platform. Signed-off-by:
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Hari Bathini authored
Currently, FADump is only supported on pSeries but that is going to change soon with FADump support being added on PowerNV platform. So, move rtas specific definitions to platform code to allow FADump to have multiple platforms support. Signed-off-by:
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Hari Bathini authored
Use helper functions to simplify memory allocation, pinning down and freeing the memory used for CPU notes buffer. Signed-off-by:
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Hari Bathini authored
The figures depicting FADump's (Firmware-Assisted Dump) memory layout are missing some finer details like different memory regions and what they represent. Improve the documentation by updating those details. Signed-off-by:
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Hari Bathini authored
Declare helper functions, that can be reused by multiple platforms, in the internal header file. Signed-off-by:
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Hari Bathini authored
Add helper functions to setup & free CPU notes buffer and to find if a given memory area is contiguous. Also, use boolean as return type for the function that finds if boot memory area is contiguous. While at it, save the virtual address of CPU notes buffer instead of physical address as virtual address is used often. Signed-off-by:
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