linux-dev/drivers/s390/char/sclp.h, branch linus/master

s390/extable: move EX_TABLE define to asm-extable.h

2022-03-07T23:33:00Z

Follow arm64 and riscv and move the EX_TABLE define to asm-extable.h which is a lot less generic than the current linkage.h. Also make sure that all files which contain EX_TABLE usages actually include the new header file. This should make sure that the files always compile and there won't be any random compile breakage due to other header file dependencies. Reviewed-by: Alexander Gordeev Signed-off-by: Heiko Carstens Signed-off-by: Vasily Gorbik

s390/sclp: sort out physical vs virtual pointers usage

2021-10-26T13:21:28Z

Provide physical addresses whenever the hardware interface expects it or a 32-bit value used for tracking. Variable sclp_early_sccb gets initialized in the decompressor and points to an address in physcal memory. Yet, it is used as virtual memory pointer and therefore should be converted. Note, the other two __bootdata variables sclp_info_sccb and sclp_info_sccb_valid contain plain data, but no pointers and do need any special care. Reviewed-by: Heiko Carstens Signed-off-by: Alexander Gordeev Signed-off-by: Vasily Gorbik

s390/sclp: reserve memory occupied by sclp early buffer

2021-08-18T08:01:29Z

The memory block occupied by the SCLP early buffer that is allocated by the decompressor and then handed over to the decompressed kernel, must be reserved to prevent it from being reused for other purposes. This is necessary because the SCLP early buffer is still in use during kernel initialization. Fixes: f1d3c5323772 ("s390/boot: move sclp early buffer from fixed address in asm to C") Signed-off-by: Alexander Egorenkov Reported-by: Alexander Gordeev Reviewed-by: Alexander Gordeev Signed-off-by: Vasily Gorbik

s390/sclp: Remove sclp base power management support

2021-06-18T14:41:21Z

Power management support was removed for s390 with commit 394216275c7d ("s390: remove broken hibernate / power management support"). Remove leftover sclp base-related power management code. Note that we keep the registration of the sclp platform driver since it is used to externalize non-PM related attributes in sysfs. Acked-by: Heiko Carstens Signed-off-by: Peter Oberparleiter Signed-off-by: Vasily Gorbik

s390/sclp: provide extended sccb support

2020-11-18T11:16:02Z

As the number of cpus increases, the sccb response can exceed 4k for read cpu and read scp info sclp commands. Hence, all cpu info entries cant be embedded within a sccb response Solution: To overcome this limitation, extended sccb facility is provided by sclp. 1. Check if the extended sccb facility is installed. 2. If extended sccb is installed, perform the read scp and read cpu command considering a max sccb length of three page size. This max length is based on factors like max cpus, sccb header. 3. If extended sccb is not installed, perform the read scp and read cpu sclp command considering a max sccb length of one page size. Signed-off-by: Sumanth Korikkar Reviewed-by: Vasily Gorbik Signed-off-by: Heiko Carstens

s390/sclp: avoid copy of sclp_info_sccb

2020-11-18T11:16:02Z

For extended sccb support, sccb size could be up to 3 pages. Hence avoid copy of sclp_info_sccb. Signed-off-by: Sumanth Korikkar Reviewed-by: Vasily Gorbik Signed-off-by: Heiko Carstens

s390/sclp: Add support for SCLP AP adapter config/deconfig

2020-10-07T19:50:00Z

Add support for AP bus adapter config and deconfig to the sclp core code. The code is statically build into the kernel when ZCRYPT is configured either as module or with static support. This is the base functionality for having configure/deconfigure support in the AP bus and card code. Another patch will exploit this soon. Signed-off-by: Harald Freudenberger Suggested-by: Pierre Morel Signed-off-by: Vasily Gorbik

s390/sclp_sdias: remove unused sclp_sdias_exit

2020-09-30T10:09:54Z

sclp_sdias cannot be built as a module, CRASH_DUMP option is a bool not a tristate. zcore_exit() has already been removed with commit cbe62fac178c ("s390: char: make zcore explicitly non-modular"). Remove orphaned sclp_sdias_exit for consistency as well. Reviewed-by: Sven Schnelle Signed-off-by: Vasily Gorbik

s390: fix clang -Wpointer-sign warnigns in boot code

2019-05-03T15:17:58Z

The arch/s390/boot directory is built with its own set of compiler options that does not include -Wno-pointer-sign like the rest of the kernel does, this causes a lot of harmless but correct warnings when building with clang. For the atomics, we can add type casts to avoid the warnings, for everything else the easiest way is to slightly adapt the types to be more consistent. Signed-off-by: Arnd Bergmann Reviewed-by: Nick Desaulniers Signed-off-by: Heiko Carstens Signed-off-by: Martin Schwidefsky

s390/sclp: do not use static sccbs

2019-04-29T08:47:10Z

The sccbs for init/read/sdias/early have to be located below 2 GB, and they are currently defined as a static buffer. With a relocatable kernel that could reside at any place in memory, this will no longer guarantee the location below 2 GB, so use a dynamic GFP_DMA allocation instead. The sclp_early_sccb buffer needs special handling, as it can be used very early, and by both the decompressor and also the decompressed kernel. Therefore, a fixed 4 KB buffer is introduced at 0x11000, the former PARMAREA_END. The new PARMAREA_END is now 0x12000, and it is renamed to HEAD_END, as it is rather the end of head.S and not the end of the parmarea. Signed-off-by: Gerald Schaefer Reviewed-by: Philipp Rudo Signed-off-by: Martin Schwidefsky