Vincent Chen 6f4eea9046 riscv: Introduce alternative mechanism to apply errata solution ... Introduce the "alternative" mechanism from ARM64 and x86 to apply the CPU vendors' errata solution at runtime. The main purpose of this patch is to provide a framework. Therefore, the implementation is quite basic for now so that some scenarios could not use this schemei, such as patching code to a module, relocating the patching code and heterogeneous CPU topology. Users could use the macro ALTERNATIVE to apply an errata to the existing code flow. In the macro ALTERNATIVE, users need to specify the manufacturer information(vendorid, archid, and impid) for this errata. Therefore, kernel will know this errata is suitable for which CPU core. During the booting procedure, kernel will select the errata required by the CPU core and then patch it. It means that the kernel only applies the errata to the specified CPU core. In this case, the vendor's errata does not affect each other at runtime. The above patching procedure only occurs during the booting phase, so we only take the overhead of the "alternative" mechanism once. This "alternative" mechanism is enabled by default to ensure that all required errata will be applied. However, users can disable this feature by the Kconfig "CONFIG_RISCV_ERRATA_ALTERNATIVE". Signed-off-by: Vincent Chen <vincent.chen@sifive.com> Reviewed-by: Anup Patel <anup@brainfault.org> Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>		2021-04-26 08:24:55 -07:00
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boot	RISC-V Patches for the 5.12 Merge Window	2021-02-26 10:28:35 -08:00
configs	RISC-V: Enable CPU Hotplug in defconfigs	2021-02-26 21:24:02 -08:00
errata	riscv: Introduce alternative mechanism to apply errata solution	2021-04-26 08:24:55 -07:00
include	riscv: Introduce alternative mechanism to apply errata solution	2021-04-26 08:24:55 -07:00
kernel	riscv: Introduce alternative mechanism to apply errata solution	2021-04-26 08:24:55 -07:00
lib	riscv: Add support for function error injection	2021-01-14 15:09:09 -08:00
mm	riscv: Cleanup KASAN_VMALLOC support	2021-03-29 23:13:29 -07:00
net	bpf: Rename BPF_XADD and prepare to encode other atomics in .imm	2021-01-14 18:34:29 -08:00
Kbuild	riscv: Allow device trees to be built into the kernel	2020-05-18 11:38:05 -07:00
Kconfig	riscv: Introduce alternative mechanism to apply errata solution	2021-04-26 08:24:55 -07:00
Kconfig.debug	RISC-V: Remove EARLY_PRINTK support	2018-12-17 10:23:46 -08:00
Kconfig.erratas	riscv: Introduce alternative mechanism to apply errata solution	2021-04-26 08:24:55 -07:00
Kconfig.socs	riscv: Update Canaan Kendryte K210 device tree	2021-02-22 17:51:13 -08:00
Makefile	riscv: Introduce alternative mechanism to apply errata solution	2021-04-26 08:24:55 -07:00