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riscv: allow different stages with alternatives 

Future features may need to be applied at a different
time during boot, so allow defining stages for alternatives
and handling them differently depending on the stage.

Also make the alternatives-location more flexible so that
future stages may provide their own location.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Reviewed-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Link: https://lore.kernel.org/r/20220511192921.2223629-3-heiko@sntech.de
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Heiko Stuebner 2022-05-11 21:29:11 +02:00 committed by Palmer Dabbelt
parent e64f737ad7
commit d14ca1f8d3
No known key found for this signature in database
GPG Key ID: EF4CA1502CCBAB41
3 changed files with 23 additions and 11 deletions
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3
arch/riscv/errata/sifive/errata.c
View File

@ -80,7 +80,8 @@ static void __init warn_miss_errata(u32 miss_errata)
}
void __init sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
unsigned long archid, unsigned long impid)
unsigned long archid, unsigned long impid,
unsigned int stage)
{
struct alt_entry *alt;
u32 cpu_req_errata = sifive_errata_probe(archid, impid);

5
arch/riscv/include/asm/alternative.h
View File

@ -19,6 +19,8 @@
#include <linux/stddef.h>
#include <asm/hwcap.h>
#define RISCV_ALTERNATIVES_BOOT 0 /* alternatives applied during regular boot */
void __init apply_boot_alternatives(void);
struct alt_entry {
@ -35,7 +37,8 @@ struct errata_checkfunc_id {
};
void sifive_errata_patch_func(struct alt_entry *begin, struct alt_entry *end,
unsigned long archid, unsigned long impid);
unsigned long archid, unsigned long impid,
unsigned int stage);
#else /* CONFIG_RISCV_ALTERNATIVE */

24
arch/riscv/kernel/alternative.c
View File

@ -22,8 +22,8 @@ static struct cpu_manufacturer_info_t {
} cpu_mfr_info;
static void (*vendor_patch_func)(struct alt_entry *begin, struct alt_entry *end,
unsigned long archid,
unsigned long impid) __initdata;
unsigned long archid, unsigned long impid,
unsigned int stage) __initdata;
static inline void __init riscv_fill_cpu_mfr_info(void)
{
@ -58,6 +58,18 @@ static void __init init_alternative(void)
* a feature detect on the boot CPU). No need to worry about other CPUs
* here.
*/
static void __init _apply_alternatives(struct alt_entry *begin,
struct alt_entry *end,
unsigned int stage)
{
if (!vendor_patch_func)
return;
vendor_patch_func(begin, end,
cpu_mfr_info.arch_id, cpu_mfr_info.imp_id,
stage);
}
void __init apply_boot_alternatives(void)
{
/* If called on non-boot cpu things could go wrong */
@ -65,11 +77,7 @@ void __init apply_boot_alternatives(void)
init_alternative();
if (!vendor_patch_func)
return;
vendor_patch_func((struct alt_entry *)__alt_start,
_apply_alternatives((struct alt_entry *)__alt_start,
(struct alt_entry *)__alt_end,
cpu_mfr_info.arch_id, cpu_mfr_info.imp_id);
RISCV_ALTERNATIVES_BOOT);
}