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* powerpc/fadump: support holes in kernel boot memory areaHari Bathini2019-09-141-0/+12
| | | | | | | | | | | 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: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821385448.5656.6124791213910877759.stgit@hbathini.in.ibm.com
* powerpc/fadump: remove RMA_START and RMA_END macrosHari Bathini2019-09-141-8/+0
| | | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821384096.5656.15026984053970204652.stgit@hbathini.in.ibm.com
* powerpc/fadump: consider f/w load areaHari Bathini2019-09-141-10/+1
| | | | | | | | | | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821381414.5656.1592867278535469652.stgit@hbathini.in.ibm.com
* powerpc/fadump: add support to preserve crash data on FADUMP disabled kernelHari Bathini2019-09-141-0/+11
| | | | | | | | | | | | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821375751.5656.11459483669542541602.stgit@hbathini.in.ibm.com
* powerpc/fadump: make crash memory ranges array allocation genericHari Bathini2019-09-141-3/+12
| | | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821369863.5656.4375667005352155892.stgit@hbathini.in.ibm.com
* powerpc/fadump: process architected register state data provided by firmwareHari Bathini2019-09-141-0/+4
| | | | | | | | | | | | 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: Hari Bathini <hbathini@linux.vnet.ibm.com> Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821367702.5656.5546683836236508389.stgit@hbathini.in.ibm.com
* powerpc/fadump: reset metadata address during clean upHari Bathini2019-09-141-0/+1
| | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821346629.5656.10783321582005237813.stgit@hbathini.in.ibm.com
* powerpc/fadump: register kernel metadata address with opalHari Bathini2019-09-141-0/+4
| | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821345011.5656.13567765019032928471.stgit@hbathini.in.ibm.com
* powerpc/fadump: add fadump support on powernvHari Bathini2019-09-141-0/+7
| | | | | | | | Add basic callback functions for FADump on PowerNV platform. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821342072.5656.4346362203141486452.stgit@hbathini.in.ibm.com
* pseries/fadump: define RTAS register/un-register callback functionsHari Bathini2019-09-141-0/+2
| | | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Reviewed-by: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821332856.5656.16380417702046411631.stgit@hbathini.in.ibm.com
* powerpc/fadump: introduce callbacks for platform specific operationsHari Bathini2019-09-141-0/+24
| | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821330286.5656.15538934400074110770.stgit@hbathini.in.ibm.com
* powerpc/fadump: move rtas specific definitions to platform codeHari Bathini2019-09-141-1/+19
| | | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821328494.5656.16219929140866195511.stgit@hbathini.in.ibm.com
* powerpc/fadump: declare helper functions in internal header fileHari Bathini2019-09-141-0/+8
| | | | | | | | | Declare helper functions, that can be reused by multiple platforms, in the internal header file. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821320487.5656.2660730464212209984.stgit@hbathini.in.ibm.com
* powerpc/fadump: add helper functionsHari Bathini2019-09-141-1/+1
| | | | | | | | | | | | 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: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821318971.5656.9281936950510635858.stgit@hbathini.in.ibm.com
* powerpc/fadump: move internal macros/definitions to a new headerHari Bathini2019-09-141-0/+86
Though asm/fadump.h is meant to be used by other components dealing with FADump, it also has macros/definitions internal to FADump code. Move them to a new header file used within FADump code. This also makes way for refactoring platform specific FADump code. Signed-off-by: Hari Bathini <hbathini@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/156821313134.5656.6597770626574392140.stgit@hbathini.in.ibm.com
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