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lib: sbi: Add a simple external interrupt handling framework

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Currently, the external interrupt handling is scattered between
sbi_init and sbi_trap. This patch moves all external interrupt
handling into a simple framework called sbi_irqchip.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel
2022-02-18 23:18:41 +05:30
committed by Anup Patel
parent f2ccf2f783
commit f3f4604c19
7 changed files with 109 additions and 34 deletions
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44
include/sbi/sbi_irqchip.h Normal file
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@@ -0,0 +1,44 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Ventana Micro Systems Inc.
*
* Authors:
* Anup Patel <apatel@ventanamicro.com>
*/
#ifndef __SBI_IRQCHIP_H__
#define __SBI_IRQCHIP_H__
#include <sbi/sbi_types.h>
struct sbi_scratch;
struct sbi_trap_regs;
/**
* Set external interrupt handling function
*
* This function is called by OpenSBI platform code to set a handler for
* external interrupts
*
* @param fn function pointer for handling external irqs
*/
void sbi_irqchip_set_irqfn(int (*fn)(struct sbi_trap_regs *regs));
/**
* Process external interrupts
*
* This function is called by sbi_trap_handler() to handle external
* interrupts.
*
* @param regs pointer for trap registers
*/
int sbi_irqchip_process(struct sbi_trap_regs *regs);
/** Initialize interrupt controllers */
int sbi_irqchip_init(struct sbi_scratch *scratch, bool cold_boot);
/** Exit interrupt controllers */
void sbi_irqchip_exit(struct sbi_scratch *scratch);
#endif

2
include/sbi/sbi_trap.h
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@@ -205,8 +205,6 @@ struct sbi_trap_info {
int sbi_trap_redirect(struct sbi_trap_regs *regs,
struct sbi_trap_info *trap);
void sbi_trap_set_external_irqfn(int (*fn)(struct sbi_trap_regs *regs));
struct sbi_trap_regs *sbi_trap_handler(struct sbi_trap_regs *regs);
void __noreturn sbi_trap_exit(const struct sbi_trap_regs *regs);

1
lib/sbi/objects.mk
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@@ -32,6 +32,7 @@ libsbi-objs-y += sbi_hsm.o
libsbi-objs-y += sbi_illegal_insn.o
libsbi-objs-y += sbi_init.o
libsbi-objs-y += sbi_ipi.o
libsbi-objs-y += sbi_irqchip.o
libsbi-objs-y += sbi_misaligned_ldst.o
libsbi-objs-y += sbi_platform.o
libsbi-objs-y += sbi_pmu.o

12
lib/sbi/sbi_init.c
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@@ -18,6 +18,7 @@
#include <sbi/sbi_hartmask.h>
#include <sbi/sbi_hsm.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_irqchip.h>
#include <sbi/sbi_platform.h>
#include <sbi/sbi_pmu.h>
#include <sbi/sbi_system.h>
@@ -270,13 +271,12 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid)
sbi_boot_print_banner(scratch);
rc = sbi_platform_irqchip_init(plat, TRUE);
rc = sbi_irqchip_init(scratch, TRUE);
if (rc) {
sbi_printf("%s: platform irqchip init failed (error %d)\n",
sbi_printf("%s: irqchip init failed (error %d)\n",
__func__, rc);
sbi_hart_hang();
}
csr_set(CSR_MIE, MIP_MEIP);
rc = sbi_ipi_init(scratch, TRUE);
if (rc) {
@@ -374,10 +374,9 @@ static void init_warm_startup(struct sbi_scratch *scratch, u32 hartid)
if (rc)
sbi_hart_hang();
rc = sbi_platform_irqchip_init(plat, FALSE);
rc = sbi_irqchip_init(scratch, FALSE);
if (rc)
sbi_hart_hang();
csr_set(CSR_MIE, MIP_MEIP);
rc = sbi_ipi_init(scratch, FALSE);
if (rc)
@@ -552,8 +551,7 @@ void __noreturn sbi_exit(struct sbi_scratch *scratch)
sbi_ipi_exit(scratch);
csr_clear(CSR_MIE, MIP_MEIP);
sbi_platform_irqchip_exit(plat);
sbi_irqchip_exit(scratch);
sbi_platform_final_exit(plat);

54
lib/sbi/sbi_irqchip.c Normal file
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@@ -0,0 +1,54 @@
/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2022 Ventana Micro Systems Inc.
*
* Authors:
* Anup Patel <apatel@ventanamicro.com>
*/
#include <sbi/sbi_irqchip.h>
#include <sbi/sbi_platform.h>
static int default_irqfn(struct sbi_trap_regs *regs)
{
return SBI_ENODEV;
}
static int (*ext_irqfn)(struct sbi_trap_regs *regs) = default_irqfn;
void sbi_irqchip_set_irqfn(int (*fn)(struct sbi_trap_regs *regs))
{
if (fn)
ext_irqfn = fn;
}
int sbi_irqchip_process(struct sbi_trap_regs *regs)
{
return ext_irqfn(regs);
}
int sbi_irqchip_init(struct sbi_scratch *scratch, bool cold_boot)
{
int rc;
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
rc = sbi_platform_irqchip_init(plat, cold_boot);
if (rc)
return rc;
if (ext_irqfn != default_irqfn)
csr_set(CSR_MIE, MIP_MEIP);
return 0;
}
void sbi_irqchip_exit(struct sbi_scratch *scratch)
{
const struct sbi_platform *plat = sbi_platform_ptr(scratch);
if (ext_irqfn != default_irqfn)
csr_clear(CSR_MIE, MIP_MEIP);
sbi_platform_irqchip_exit(plat);
}

26
lib/sbi/sbi_trap.c
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@@ -15,6 +15,7 @@
#include <sbi/sbi_hart.h>
#include <sbi/sbi_illegal_insn.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_irqchip.h>
#include <sbi/sbi_misaligned_ldst.h>
#include <sbi/sbi_pmu.h>
#include <sbi/sbi_scratch.h>
@@ -195,27 +196,6 @@ int sbi_trap_redirect(struct sbi_trap_regs *regs,
return 0;
}
static int default_irqfn(struct sbi_trap_regs *regs)
{
return SBI_ENODEV;
}
static int (*ext_irqfn)(struct sbi_trap_regs *regs) = default_irqfn;
/**
* Set external irq handler function
*
* This function is called by OpenSBI platform code to set a handler for
* external interrupts
*
* @param fn function pointer for handling external irqs
*/
void sbi_trap_set_external_irqfn(int (*fn)(struct sbi_trap_regs *regs))
{
if (fn)
ext_irqfn = fn;
}
static int sbi_trap_nonaia_irq(struct sbi_trap_regs *regs, ulong mcause)
{
mcause &= ~(1UL << (__riscv_xlen - 1));
@@ -227,7 +207,7 @@ static int sbi_trap_nonaia_irq(struct sbi_trap_regs *regs, ulong mcause)
sbi_ipi_process();
break;
case IRQ_M_EXT:
return ext_irqfn(regs);
return sbi_irqchip_process(regs);
default:
return SBI_ENOENT;
};
@@ -250,7 +230,7 @@ static int sbi_trap_aia_irq(struct sbi_trap_regs *regs, ulong mcause)
sbi_ipi_process();
break;
case IRQ_M_EXT:
rc = ext_irqfn(regs);
rc = sbi_irqchip_process(regs);
if (rc)
return rc;
break;

4
lib/utils/irqchip/imsic.c
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@@ -15,8 +15,8 @@
#include <sbi/sbi_domain.h>
#include <sbi/sbi_hartmask.h>
#include <sbi/sbi_ipi.h>
#include <sbi/sbi_irqchip.h>
#include <sbi/sbi_error.h>
#include <sbi/sbi_trap.h>
#include <sbi_utils/irqchip/imsic.h>
#define IMSIC_MMIO_PAGE_LE 0x00
@@ -268,7 +268,7 @@ int imsic_cold_irqchip_init(struct imsic_data *imsic)
return SBI_EINVAL;
/* Setup external interrupt function for IMSIC */
sbi_trap_set_external_irqfn(imsic_external_irqfn);
sbi_irqchip_set_irqfn(imsic_external_irqfn);
/* Add IMSIC regions to the root domain */
for (i = 0; i < IMSIC_MAX_REGS && imsic->regs[i].size; i++) {