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lib: Implement Hart State Management (HSM) SBI extension

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This patch adds support HSM extension. The specification is available
at https://github.com/riscv/riscv-sbi-doc.

It allows to implement hart hotplug and fixed ordered hart booting in
supervisor.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra
2020-02-11 17:32:39 -08:00
committed by Anup Patel
parent 5b4824082f
commit e3f69fc1e9
5 changed files with 62 additions and 0 deletions
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1
include/sbi/sbi_ecall.h
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@@ -39,6 +39,7 @@ extern struct sbi_ecall_extension ecall_time;
extern struct sbi_ecall_extension ecall_rfence;
extern struct sbi_ecall_extension ecall_ipi;
extern struct sbi_ecall_extension ecall_vendor;
extern struct sbi_ecall_extension ecall_hsm;
u16 sbi_ecall_version_major(void);

6
include/sbi/sbi_ecall_interface.h
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@@ -26,6 +26,7 @@
#define SBI_EXT_TIME 0x54494D45
#define SBI_EXT_IPI 0x735049
#define SBI_EXT_RFENCE 0x52464E43
#define SBI_EXT_HSM 0x48534D
/* SBI function IDs for BASE extension*/
#define SBI_EXT_BASE_GET_SPEC_VERSION 0x0
@@ -51,6 +52,11 @@
#define SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA 0x5
#define SBI_EXT_RFENCE_REMOTE_HFENCE_VVMA_ASID 0x6
/* SBI function IDs for HSM extension */
#define SBI_EXT_HSM_HART_START 0x0
#define SBI_EXT_HSM_HART_STOP 0x1
#define SBI_EXT_HSM_HART_GET_STATUS 0x2
#define SBI_HSM_HART_STATUS_STARTED 0x0
#define SBI_HSM_HART_STATUS_STOPPED 0x1
#define SBI_HSM_HART_STATUS_START_PENDING 0x2

1
lib/sbi/objects.mk
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@@ -18,6 +18,7 @@ libsbi-objs-y += sbi_ecall_base.o
libsbi-objs-y += sbi_ecall_legacy.o
libsbi-objs-y += sbi_ecall_replace.o
libsbi-objs-y += sbi_ecall_vendor.o
libsbi-objs-y += sbi_ecall_hsm.o
libsbi-objs-y += sbi_emulate_csr.o
libsbi-objs-y += sbi_fifo.o
libsbi-objs-y += sbi_hfence.o

3
lib/sbi/sbi_ecall.c
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@@ -136,6 +136,9 @@ int sbi_ecall_init(void)
if (ret)
return ret;
ret = sbi_ecall_register_extension(&ecall_base);
if (ret)
return ret;
ret = sbi_ecall_register_extension(&ecall_hsm);
if (ret)
return ret;
ret = sbi_ecall_register_extension(&ecall_legacy);

51
lib/sbi/sbi_ecall_hsm.c Normal file
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@@ -0,0 +1,51 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2020 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra <atish.patra@wdc.com>
*/
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_version.h>
#include <sbi/sbi_hsm.h>
#include <sbi/riscv_asm.h>
static int sbi_ecall_hsm_handler(struct sbi_scratch *scratch,
unsigned long extid, unsigned long funcid,
unsigned long *args, unsigned long *out_val,
struct sbi_trap_info *out_trap)
{
int ret = 0;
int hstate;
switch (funcid) {
case SBI_EXT_HSM_HART_START:
ret = sbi_hsm_hart_start(scratch, args[0], args[1], args[2]);
break;
case SBI_EXT_HSM_HART_STOP:
ret = sbi_hsm_hart_stop(scratch, TRUE);
break;
case SBI_EXT_HSM_HART_GET_STATUS:
hstate = sbi_hsm_hart_get_state(scratch, args[0]);
ret = sbi_hsm_hart_state_to_status(hstate);
break;
default:
ret = SBI_ENOTSUPP;
};
if (ret >= 0) {
*out_val = ret;
ret = 0;
}
return ret;
}
struct sbi_ecall_extension ecall_hsm = {
.extid_start = SBI_EXT_HSM,
.extid_end = SBI_EXT_HSM,
.handle = sbi_ecall_hsm_handler,
};