kernel.git/arch/riscv/kernel/smp.c, branch linux-5.4.y

RISC-V: Fix error code returned by riscv_hartid_to_cpuid()

2021-05-19T08:08:26Z

[ Upstream commit 533b4f3a789d49574e7ae0f6ececed153f651f97 ] We should return a negative error code upon failure in riscv_hartid_to_cpuid() instead of NR_CPUS. This is also aligned with all uses of riscv_hartid_to_cpuid() which expect negative error code upon failure. Fixes: 6825c7a80f18 ("RISC-V: Add logical CPU indexing for RISC-V") Fixes: f99fb607fb2b ("RISC-V: Use Linux logical CPU number instead of hartid") Signed-off-by: Anup Patel Signed-off-by: Palmer Dabbelt Signed-off-by: Sasha Levin

riscv: add missing header file includes

2019-10-28T07:46:01Z

sparse identifies several missing prototypes caused by missing preprocessor include directives: arch/riscv/kernel/cpufeature.c:16:6: warning: symbol 'has_fpu' was not declared. Should it be static? arch/riscv/kernel/process.c:26:6: warning: symbol 'arch_cpu_idle' was not declared. Should it be static? arch/riscv/kernel/reset.c:15:6: warning: symbol 'pm_power_off' was not declared. Should it be static? arch/riscv/kernel/syscall_table.c:15:6: warning: symbol 'sys_call_table' was not declared. Should it be static? arch/riscv/kernel/traps.c:149:13: warning: symbol 'trap_init' was not declared. Should it be static? arch/riscv/kernel/vdso.c:54:5: warning: symbol 'arch_setup_additional_pages' was not declared. Should it be static? arch/riscv/kernel/smp.c:64:6: warning: symbol 'arch_match_cpu_phys_id' was not declared. Should it be static? arch/riscv/kernel/module-sections.c:89:5: warning: symbol 'module_frob_arch_sections' was not declared. Should it be static? arch/riscv/mm/context.c:42:6: warning: symbol 'switch_mm' was not declared. Should it be static? Fix by including the appropriate header files in the appropriate source files. This patch should have no functional impact. Signed-off-by: Paul Walmsley Reviewed-by: Christoph Hellwig

RISC-V: Export kernel symbols for kvm

2019-09-20T15:36:39Z

Export a few symbols used by kvm module. Without this, kvm cannot be compiled as a module. Signed-off-by: Atish Patra Signed-off-by: Anup Patel Acked-by: Paolo Bonzini Reviewed-by: Paolo Bonzini Reviewed-by: Alexander Graf [paul.walmsley@sifive.com: updated to apply; clarified short patch description] Signed-off-by: Paul Walmsley

riscv: cleanup riscv_cpuid_to_hartid_mask

2019-09-05T08:51:57Z

Move the initial clearing of the mask from the callers to riscv_cpuid_to_hartid_mask, and remove the unused !CONFIG_SMP stub. Signed-off-by: Christoph Hellwig Reviewed-by: Atish Patra Signed-off-by: Paul Walmsley

riscv: optimize send_ipi_single

2019-09-05T08:46:21Z

Don't go through send_ipi_mask, but just set the op bit and then pass a simple generated hartid mask directly to sbi_send_ipi. Signed-off-by: Christoph Hellwig Reviewed-by: Atish Patra [paul.walmsley@sifive.com: minor patch description fixes] Signed-off-by: Paul Walmsley

riscv: cleanup send_ipi_mask

2019-09-05T08:44:37Z

Use the special barriers for atomic bitops to make the intention a little more clear, and use riscv_cpuid_to_hartid_mask instead of open coding it. Signed-off-by: Christoph Hellwig Reviewed-by: Atish Patra Signed-off-by: Paul Walmsley

riscv: refactor the IPI code

2019-09-05T07:55:48Z

This prepares for adding native non-SBI IPI code. Signed-off-by: Christoph Hellwig Reviewed-by: Atish Patra Signed-off-by: Paul Walmsley

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234

2019-06-19T15:09:07Z

Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 503 file(s). Signed-off-by: Thomas Gleixner Reviewed-by: Alexios Zavras Reviewed-by: Allison Randal Reviewed-by: Enrico Weigelt Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190602204653.811534538@linutronix.de Signed-off-by: Greg Kroah-Hartman

riscv: move flush_icache_{all,mm} to cacheflush.c

2019-05-17T03:42:12Z

Currently, flush_icache_all is macro-expanded into a SBI call, yet no asm/sbi.h is included in asm/cacheflush.h. This could be moved to mm/cacheflush.c instead (SBI call will dominate performance-wise and there is no worry to not have it inlined. Currently, flush_icache_mm stays in kernel/smp.c, which looks like a hack to prevent it from being compiled when CONFIG_SMP=n. It should also be in mm/cacheflush.c. Signed-off-by: Gary Guo Signed-off-by: Christoph Hellwig Signed-off-by: Palmer Dabbelt

RISC-V: Access CSRs using CSR numbers

2019-05-17T03:42:11Z

We should prefer accessing CSRs using their CSR numbers because: 1. It compiles fine with older toolchains. 2. We can use latest CSR names in #define macro names of CSR numbers as-per RISC-V spec. 3. We can access newly added CSRs even if toolchain does not recognize newly addes CSRs by name. Signed-off-by: Anup Patel Reviewed-by: Christoph Hellwig Signed-off-by: Palmer Dabbelt