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lib: sbi: Implement SBI debug trigger extension

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This patch adds functions to register ecalls for debug triggers
and handler to handle the debug trigger function IDs.

Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Himanshu Chauhan
2024-01-09 22:30:19 +05:30
committed by Anup Patel
parent fa87ec90a0
commit 76a2a15c40
3 changed files with 80 additions and 0 deletions
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4
lib/sbi/Kconfig
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@@ -46,4 +46,8 @@ config SBI_ECALL_VENDOR
bool "Platform-defined vendor extensions"
default y
config SBI_ECALL_DBTR
bool "Debug Trigger Extension"
default y
endmenu

3
lib/sbi/objects.mk
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@@ -52,6 +52,9 @@ libsbi-objs-$(CONFIG_SBI_ECALL_LEGACY) += sbi_ecall_legacy.o
carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_VENDOR) += ecall_vendor
libsbi-objs-$(CONFIG_SBI_ECALL_VENDOR) += sbi_ecall_vendor.o
carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_DBTR) += ecall_dbtr
libsbi-objs-$(CONFIG_SBI_ECALL_DBTR) += sbi_ecall_dbtr.o
libsbi-objs-y += sbi_bitmap.o
libsbi-objs-y += sbi_bitops.o
libsbi-objs-y += sbi_console.o

73
lib/sbi/sbi_ecall_dbtr.c Normal file
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@@ -0,0 +1,73 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2023 Ventana Micro Systems Inc.
*
* Author(s):
* Himanshu Chauhan <hchauhan@ventanamicro.com>
*/
#include <sbi/sbi_ecall.h>
#include <sbi/sbi_ecall_interface.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_trap.h>
#include <sbi/sbi_domain.h>
#include <sbi/sbi_dbtr.h>
static int sbi_ecall_dbtr_handler(unsigned long extid, unsigned long funcid,
struct sbi_trap_regs *regs,
struct sbi_ecall_return *out)
{
unsigned long smode = (csr_read(CSR_MSTATUS) & MSTATUS_MPP) >>
MSTATUS_MPP_SHIFT;
int ret = 0;
switch (funcid) {
case SBI_EXT_DBTR_NUM_TRIGGERS:
ret = sbi_dbtr_num_trig(regs->a0, &out->value);
break;
case SBI_EXT_DBTR_SETUP_SHMEM:
ret = sbi_dbtr_setup_shmem(sbi_domain_thishart_ptr(), smode,
regs->a0, regs->a1);
break;
case SBI_EXT_DBTR_TRIGGER_READ:
ret = sbi_dbtr_read_trig(smode, regs->a0, regs->a1);
break;
case SBI_EXT_DBTR_TRIGGER_INSTALL:
ret = sbi_dbtr_install_trig(smode, regs->a0, &out->value);
break;
case SBI_EXT_DBTR_TRIGGER_UNINSTALL:
ret = sbi_dbtr_uninstall_trig(regs->a0, regs->a1);
break;
case SBI_EXT_DBTR_TRIGGER_ENABLE:
ret = sbi_dbtr_enable_trig(regs->a0, regs->a1);
break;
case SBI_EXT_DBTR_TRIGGER_UPDATE:
ret = sbi_dbtr_update_trig(smode, regs->a0, regs->a1);
break;
case SBI_EXT_DBTR_TRIGGER_DISABLE:
ret = sbi_dbtr_disable_trig(regs->a0, regs->a1);
break;
default:
ret = SBI_ENOTSUPP;
};
return ret;
}
struct sbi_ecall_extension ecall_dbtr;
static int sbi_ecall_dbtr_register_extensions(void)
{
if (sbi_dbtr_get_total_triggers() == 0)
return 0;
return sbi_ecall_register_extension(&ecall_dbtr);
}
struct sbi_ecall_extension ecall_dbtr = {
.extid_start = SBI_EXT_DBTR,
.extid_end = SBI_EXT_DBTR,
.handle = sbi_ecall_dbtr_handler,
.register_extensions = sbi_ecall_dbtr_register_extensions,
};