[PATCH RFC v1 1/1] lib: sbi: add support for debug triggers
Jessica Clarke
jrtc27 at jrtc27.com
Mon Oct 31 14:37:32 PDT 2022
On 31 Oct 2022, at 21:18, Sergey Matyukevich <geomatsi at gmail.com> wrote:
>
> From: Sergey Matyukevich <sergey.matyukevich at syntacore.com>
>
> RISC-V Debug specification includes Sdtrig ISA extension.
> This extension describes Trigger Module. Triggers can cause
> a breakpoint exception, entry into Debug Mode, or a trace
> action without having to execute a special instruction. For
> native debugging triggers can be used to implement hardware
> breakpoints and watchpoints.
>
> Software support for RISC-V hardware triggers consists of the
> following major components:
> - U-mode: gdb support for setting hw breakpoints/watchpoints
> - S/VS-mode: hardware breakpoints framework in Linux kernel
> - M-mode: SBI firmware code to handle triggers
>
> SBI Debug Trigger extension proposal (draft v4) has been posted
> by Anup Patel to lists.riscv.org tech-debug mailing list:
>
> https://lists.riscv.org/g/tech-debug/topic/92375492
>
> This patch provides initial implementation of SBI Debug
> Trigger Extension in OpenSBI library based on the
> suggested extension proposal.
>
> Initial implementation has the following limitations:
> - only mcontrol6 trigger type is supported
> - no support for chained triggers
> - trigger update supports only address change
>
> Signed-off-by: Sergey Matyukevich <sergey.matyukevich at syntacore.com>
> ---
> include/sbi/riscv_dbtr.h | 78 ++++++
> include/sbi/riscv_encoding.h | 1 +
> include/sbi/sbi_dbtr.h | 79 ++++++
> include/sbi/sbi_ecall_interface.h | 10 +
> lib/sbi/Kconfig | 4 +
> lib/sbi/objects.mk | 3 +
> lib/sbi/sbi_dbtr.c | 404 ++++++++++++++++++++++++++++++
> lib/sbi/sbi_ecall_dbtr.c | 68 +++++
> lib/sbi/sbi_init.c | 9 +
> 9 files changed, 656 insertions(+)
> create mode 100644 include/sbi/riscv_dbtr.h
> create mode 100644 include/sbi/sbi_dbtr.h
> create mode 100644 lib/sbi/sbi_dbtr.c
> create mode 100644 lib/sbi/sbi_ecall_dbtr.c
>
> diff --git a/include/sbi/riscv_dbtr.h b/include/sbi/riscv_dbtr.h
> new file mode 100644
> index 0000000..e5f6f4e
> --- /dev/null
> +++ b/include/sbi/riscv_dbtr.h
> @@ -0,0 +1,78 @@
> +/*
> + * SPDX-License-Identifier: BSD-2-Clause
> + *
> + * Copyright (c) 2022 Syntacore
> + *
> + * Authors:
> + * Sergey Matyukevich <sergey.matyukevich at syntacore.com>
> + *
> + */
> +
> +#ifndef __RISCV_DBTR_H__
> +#define __RISCV_DBTR_H__
> +
> +#define RV_MAX_TRIGGERS 32
> +
> +enum {
> + RISCV_DBTR_TRIG_NONE = 0,
> + RISCV_DBTR_TRIG_LEGACY,
> + RISCV_DBTR_TRIG_MCONTROL,
> + RISCV_DBTR_TRIG_ICOUNT,
> + RISCV_DBTR_TRIG_ITRIGGER,
> + RISCV_DBTR_TRIG_ETRIGGER,
> + RISCV_DBTR_TRIG_MCONTROL6,
> +};
> +
> +union riscv_dbtr_tdata1 {
> + unsigned long value;
> + struct {
> +#if __riscv_xlen == 64
> + unsigned long data:59;
> +#elif __riscv_xlen == 32
> + unsigned long data:27;
> +#else
> +#error "Unexpected __riscv_xlen"
> +#endif
> + unsigned long dmode:1;
> + unsigned long type:4;
> + };
> +};
Bitfield order depends on endianness (type is in the MSBs for
little-endian but LSBs for big-endian).
> +union riscv_dbtr_tdata1_mcontrol6 {
> + unsigned long value;
> + struct {
> + unsigned long load:1;
> + unsigned long store:1;
> + unsigned long execute:1;
> + unsigned long u:1;
> + unsigned long s:1;
> + unsigned long _res2:1;
> + unsigned long m:1;
> + unsigned long match:4;
> + unsigned long chain:1;
> + unsigned long action:4;
> + unsigned long size:4;
> + unsigned long timing:1;
> + unsigned long select:1;
> + unsigned long hit:1;
> + unsigned long vu:1;
> + unsigned long vs:1;
> +#if __riscv_xlen == 64
> + unsigned long _res1:34;
> +#elif __riscv_xlen == 32
> + unsigned long _res1:2;
> +#else
> +#error "Unexpected __riscv_xlen"
> +#endif
> + unsigned long dmode:1;
> + unsigned long type:4;
> + };
> +};
> +
> +#define MCONTROL6_U_OFFSET 3
> +#define MCONTROL6_S_OFFSET 4
> +#define MCONTROL6_M_OFFSET 6
> +#define MCONTROL6_VU_OFFSET 23
> +#define MCONTROL6_VS_OFFSET 24
> +
> +#endif /* __RISCV_DBTR_H__ */
> diff --git a/include/sbi/riscv_encoding.h b/include/sbi/riscv_encoding.h
> index b0f08c8..2041ab7 100644
> --- a/include/sbi/riscv_encoding.h
> +++ b/include/sbi/riscv_encoding.h
> @@ -671,6 +671,7 @@
> #define CSR_TDATA1 0x7a1
> #define CSR_TDATA2 0x7a2
> #define CSR_TDATA3 0x7a3
> +#define CSR_TINFO 0x7a4
>
> /* Debug Mode Registers */
> #define CSR_DCSR 0x7b0
> diff --git a/include/sbi/sbi_dbtr.h b/include/sbi/sbi_dbtr.h
> new file mode 100644
> index 0000000..568b5ea
> --- /dev/null
> +++ b/include/sbi/sbi_dbtr.h
> @@ -0,0 +1,79 @@
> +/*
> + * SPDX-License-Identifier: BSD-2-Clause
> + *
> + * Copyright (c) 2022 Syntacore
> + *
> + * Authors:
> + * Sergey Matyukevich <sergey.matyukevich at syntacore.com>
> + *
> + */
> +
> +#ifndef __SBI_DBTR_H__
> +#define __SBI_DBTR_H__
> +
> +#include <sbi/riscv_dbtr.h>
> +
> +#include <sbi/sbi_hartmask.h>
> +#include <sbi/sbi_scratch.h>
> +#include <sbi/sbi_domain.h>
> +#include <sbi/sbi_types.h>
> +
> +/** Representation of trigger state */
> +union sbi_dbtr_trig_state {
> + unsigned long value;
> + struct {
> + unsigned long mapped:1;
> + unsigned long u:1;
> + unsigned long s:1;
> + unsigned long vu:1;
> + unsigned long vs:1;
> +#if __riscv_xlen == 64
> + unsigned long reserved:59;
> +#elif __riscv_xlen == 32
> + unsigned long reserved:27;
> +#else
> +#error "Unexpected __riscv_xlen"
> +#endif
> + };
> +};
> +
> +struct sbi_dbtr_trig_info {
> + unsigned long type_mask;
> + union sbi_dbtr_trig_state state;
> + unsigned long tdata1;
> + unsigned long tdata2;
> + unsigned long tdata3;
> +};
> +
> +/** SBI shared mem messages layout */
> +struct sbi_dbtr_data_msg {
> + unsigned long tstate;
> + unsigned long tdata1;
> + unsigned long tdata2;
> + unsigned long tdata3;
> +} __packed;
Why? This will give awful codegen.
> +struct sbi_dbtr_id_msg {
> + unsigned long idx;
> +} __packed;
Ditto.
Jess
> +/** Initialize PMU */
> +int sbi_dbtr_init(struct sbi_scratch *scratch);
> +
> +/** SBI DBTR extension functions */
> +int sbi_dbtr_probe(unsigned long *out);
> +int sbi_dbtr_num_trig(unsigned long trig_tdata1, unsigned long *out);
> +int sbi_dbtr_read_trig(const struct sbi_domain *dom, unsigned long smode,
> + unsigned long trig_idx_base, unsigned long trig_count,
> + unsigned long out_addr_div_by_16);
> +int sbi_dbtr_install_trig(const struct sbi_domain *dom, unsigned long smode,
> + unsigned long trig_count, unsigned long in_addr_div_by_16,
> + unsigned long out_addr_div_by_16, unsigned long *out);
> +int sbi_dbtr_uninstall_trig(unsigned long trig_idx_base, unsigned long trig_idx_mask);
> +int sbi_dbtr_enable_trig(unsigned long trig_idx_base, unsigned long trig_idx_mask);
> +int sbi_dbtr_update_trig(const struct sbi_domain *dom, unsigned long smode,
> + unsigned long trig_count, unsigned long in_addr_div_by_16,
> + unsigned long out_addr_div_by_16);
> +int sbi_dbtr_disable_trig(unsigned long trig_idx_base, unsigned long trig_idx_mask);
> +
> +#endif
> diff --git a/include/sbi/sbi_ecall_interface.h b/include/sbi/sbi_ecall_interface.h
> index a3f2bf4..3c1b1ea 100644
> --- a/include/sbi/sbi_ecall_interface.h
> +++ b/include/sbi/sbi_ecall_interface.h
> @@ -29,6 +29,7 @@
> #define SBI_EXT_HSM 0x48534D
> #define SBI_EXT_SRST 0x53525354
> #define SBI_EXT_PMU 0x504D55
> +#define SBI_EXT_DBTR 0x44425452
>
> /* SBI function IDs for BASE extension*/
> #define SBI_EXT_BASE_GET_SPEC_VERSION 0x0
> @@ -100,6 +101,15 @@
> #define SBI_EXT_PMU_COUNTER_STOP 0x4
> #define SBI_EXT_PMU_COUNTER_FW_READ 0x5
>
> +/* SBI function IDs for DBTR extension */
> +#define SBI_EXT_DBTR_NUM_TRIGGERS 0x0
> +#define SBI_EXT_DBTR_TRIGGER_READ 0x1
> +#define SBI_EXT_DBTR_TRIGGER_INSTALL 0x2
> +#define SBI_EXT_DBTR_TRIGGER_UNINSTALL 0x3
> +#define SBI_EXT_DBTR_TRIGGER_ENABLE 0x4
> +#define SBI_EXT_DBTR_TRIGGER_UPDATE 0x5
> +#define SBI_EXT_DBTR_TRIGGER_DISABLE 0x6
> +
> /** General pmu event codes specified in SBI PMU extension */
> enum sbi_pmu_hw_generic_events_t {
> SBI_PMU_HW_NO_EVENT = 0,
> diff --git a/lib/sbi/Kconfig b/lib/sbi/Kconfig
> index df74bba..e3a7955 100644
> --- a/lib/sbi/Kconfig
> +++ b/lib/sbi/Kconfig
> @@ -34,4 +34,8 @@ config SBI_ECALL_VENDOR
> bool "Platform-defined vendor extensions"
> default y
>
> +config SBI_ECALL_DBTR
> + bool "Debug Trigger Extension"
> + default y
> +
> endmenu
> diff --git a/lib/sbi/objects.mk b/lib/sbi/objects.mk
> index 783c46d..d45a24a 100644
> --- a/lib/sbi/objects.mk
> +++ b/lib/sbi/objects.mk
> @@ -25,6 +25,7 @@ carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_SRST) += ecall_srst
> carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_PMU) += ecall_pmu
> carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_LEGACY) += ecall_legacy
> carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_VENDOR) += ecall_vendor
> +carray-sbi_ecall_exts-$(CONFIG_SBI_ECALL_DBTR) += ecall_dbtr
>
> libsbi-objs-y += sbi_ecall_base.o
> libsbi-objs-$(CONFIG_SBI_ECALL_HSM) += sbi_ecall_hsm.o
> @@ -32,6 +33,7 @@ libsbi-objs-$(CONFIG_SBI_ECALL_LEGACY) += sbi_ecall_legacy.o
> libsbi-objs-$(CONFIG_SBI_ECALL_PMU) += sbi_ecall_pmu.o
> libsbi-objs-y += sbi_ecall_replace.o
> libsbi-objs-$(CONFIG_SBI_ECALL_VENDOR) += sbi_ecall_vendor.o
> +libsbi-objs-$(CONFIG_SBI_ECALL_DBTR) += sbi_ecall_dbtr.o
>
> libsbi-objs-y += sbi_bitmap.o
> libsbi-objs-y += sbi_bitops.o
> @@ -50,6 +52,7 @@ 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
> +libsbi-objs-y += sbi_dbtr.o
> libsbi-objs-y += sbi_scratch.o
> libsbi-objs-y += sbi_string.o
> libsbi-objs-y += sbi_system.o
> diff --git a/lib/sbi/sbi_dbtr.c b/lib/sbi/sbi_dbtr.c
> new file mode 100644
> index 0000000..943b5fc
> --- /dev/null
> +++ b/lib/sbi/sbi_dbtr.c
> @@ -0,0 +1,404 @@
> +/*
> + * SPDX-License-Identifier: BSD-2-Clause
> + *
> + * Copyright (c) 2022 Syntacore
> + *
> + * Authors:
> + * Sergey Matyukevich <sergey.matyukevich at syntacore.com>
> + *
> + */
> +
> +#include <sbi/sbi_ecall_interface.h>
> +#include <sbi/sbi_csr_detect.h>
> +#include <sbi/sbi_platform.h>
> +#include <sbi/sbi_console.h>
> +#include <sbi/sbi_trap.h>
> +#include <sbi/sbi_dbtr.h>
> +
> +#include <sbi/riscv_encoding.h>
> +#include <sbi/riscv_asm.h>
> +
> +static struct sbi_dbtr_trig_info triggers[SBI_HARTMASK_MAX_BITS][RV_MAX_TRIGGERS] = {0};
> +static uint32_t total_trigs;
> +
> +static void sbi_triggers_table_init(u32 hartid, int idx, unsigned long type_mask)
> +{
> + triggers[hartid][idx].type_mask = type_mask;
> + triggers[hartid][idx].state.value = 0;
> + triggers[hartid][idx].tdata1 = 0;
> + triggers[hartid][idx].tdata2 = 0;
> + triggers[hartid][idx].tdata3 = 0;
> +}
> +
> +int sbi_dbtr_init(struct sbi_scratch *scratch)
> +{
> + struct sbi_trap_info trap = {0};
> + u32 hartid = current_hartid();
> + union riscv_dbtr_tdata1 tdata1;
> + unsigned long val;
> + int i;
> +
> + total_trigs = 0;
> +
> + for (i = 0; i < RV_MAX_TRIGGERS; i++) {
> + csr_write_allowed(CSR_TSELECT, (ulong)&trap, i);
> + if (trap.cause)
> + break;
> +
> + val = csr_read_allowed(CSR_TSELECT, (ulong)&trap);
> + if (trap.cause)
> + break;
> +
> + /* Read back tselect and check that it contains the written value */
> + if (val != i)
> + break;
> +
> + val = csr_read_allowed(CSR_TINFO, (ulong)&trap);
> + if (trap.cause) {
> + /**
> + * If reading tinfo caused an exception, the debugger
> + * must read tdata1 to discover the type.
> + */
> + tdata1.value = csr_read_allowed(CSR_TDATA1, (ulong)&trap);
> + if (trap.cause)
> + break;
> +
> + if (tdata1.type == 0)
> + break;
> +
> +
> + sbi_triggers_table_init(hartid, i, BIT(tdata1.type));
> + total_trigs++;
> + } else {
> + if (val == 1)
> + break;
> +
> + sbi_triggers_table_init(hartid, i, val);
> + total_trigs++;
> + }
> + }
> +
> + return 0;
> +}
> +
> +int sbi_dbtr_probe(unsigned long *out)
> +{
> + *out = total_trigs;
> +
> + return 0;
> +}
> +
> +static void dbtr_trigger_enable(unsigned int hartid, unsigned int idx)
> +{
> + if (!triggers[hartid][idx].state.mapped)
> + return;
> +
> + if (triggers[hartid][idx].state.vu)
> + __set_bit(MCONTROL6_VU_OFFSET, &triggers[hartid][idx].tdata1);
> + else
> + __clear_bit(MCONTROL6_VU_OFFSET, &triggers[hartid][idx].tdata1);
> +
> + if (triggers[hartid][idx].state.vs)
> + __set_bit(MCONTROL6_VS_OFFSET, &triggers[hartid][idx].tdata1);
> + else
> + __clear_bit(MCONTROL6_VS_OFFSET, &triggers[hartid][idx].tdata1);
> +
> + if (triggers[hartid][idx].state.u)
> + __set_bit(MCONTROL6_U_OFFSET, &triggers[hartid][idx].tdata1);
> + else
> + __clear_bit(MCONTROL6_U_OFFSET, &triggers[hartid][idx].tdata1);
> +
> + if (triggers[hartid][idx].state.s)
> + __set_bit(MCONTROL6_S_OFFSET, &triggers[hartid][idx].tdata1);
> + else
> + __clear_bit(MCONTROL6_S_OFFSET, &triggers[hartid][idx].tdata1);
> +
> + /*
> + * RISC-V Debug Support v1.0.0 section 5.5:
> + * Debugger cannot simply set a trigger by writing tdata1, then tdata2, etc. The current
> + * value of tdata2 might not be legal with the new value of tdata1. To help with this
> + * situation, it is guaranteed that writing 0 to tdata1 disables the trigger, and
> + * leaves it in a state where tdata2 and tdata3 can be written with any value
> + * that makes sense for any trigger type supported by this trigger.
> + */
> + csr_write(CSR_TSELECT, idx);
> + csr_write(CSR_TDATA1, 0x0);
> + csr_write(CSR_TDATA2, triggers[hartid][idx].tdata2);
> + csr_write(CSR_TDATA1, triggers[hartid][idx].tdata1);
> +}
> +
> +static void dbtr_trigger_disable(unsigned int hartid, unsigned int idx)
> +{
> + if (!triggers[hartid][idx].state.mapped)
> + return;
> +
> + __clear_bit(MCONTROL6_VU_OFFSET, &triggers[hartid][idx].tdata1);
> + __clear_bit(MCONTROL6_VS_OFFSET, &triggers[hartid][idx].tdata1);
> + __clear_bit(MCONTROL6_U_OFFSET, &triggers[hartid][idx].tdata1);
> + __clear_bit(MCONTROL6_S_OFFSET, &triggers[hartid][idx].tdata1);
> +
> + csr_write(CSR_TSELECT, idx);
> + csr_write(CSR_TDATA1, triggers[hartid][idx].tdata1);
> +}
> +
> +static void dbtr_trigger_clear(unsigned int hartid, unsigned int idx)
> +{
> + if (!triggers[hartid][idx].state.mapped)
> + return;
> +
> + csr_write(CSR_TSELECT, idx);
> + csr_write(CSR_TDATA1, 0x0);
> + csr_write(CSR_TDATA2, 0x0);
> +}
> +
> +int sbi_dbtr_num_trig(unsigned long data, unsigned long *out)
> +{
> + unsigned long type = ((union riscv_dbtr_tdata1)data).type;
> + u32 hartid = current_hartid();
> + unsigned long total = 0;
> + int i;
> +
> +
> + if (data == 0) {
> + sbi_dprintf("%s: hart%d: total triggers: %u\n",
> + __func__, hartid, total_trigs);
> + *out = total_trigs;
> + return SBI_SUCCESS;
> + }
> +
> + for (i = 0; i < total_trigs; i++) {
> + if (__test_bit(type, &triggers[hartid][i].type_mask))
> + total++;
> + }
> +
> +
> + sbi_dprintf("%s: hart%d: total triggers of type %lu: %lu\n",
> + __func__, hartid, type, total);
> +
> + *out = total;
> + return SBI_SUCCESS;
> +}
> +
> +int sbi_dbtr_read_trig(const struct sbi_domain *dom, unsigned long smode,
> + unsigned long trig_idx_base, unsigned long trig_count,
> + unsigned long out_addr_div_by_16)
> +{
> + unsigned long out_addr = (out_addr_div_by_16 << 4);
> + struct sbi_dbtr_data_msg *xmit;
> + u32 hartid = current_hartid();
> + int i;
> +
> + if (smode != PRV_S)
> + return SBI_ERR_DENIED;
> + if (dom && !sbi_domain_is_assigned_hart(dom, hartid))
> + return SBI_ERR_DENIED;
> + if (dom && !sbi_domain_check_addr(dom, out_addr, smode, SBI_DOMAIN_READ | SBI_DOMAIN_WRITE))
> + return SBI_ERR_INVALID_ADDRESS;
> +
> + if (trig_idx_base >= total_trigs || trig_idx_base + trig_count >= total_trigs) {
> + sbi_dprintf("%s: hart%d: invalid trigger index\n", __func__, hartid);
> + return SBI_ERR_INVALID_PARAM;
> + }
> +
> + for (i = 0; i < trig_count; i++) {
> + xmit = (struct sbi_dbtr_data_msg *)(out_addr + i * sizeof(*xmit));
> +
> + sbi_dprintf("%s: hart%d: read trigger %d\n", __func__, hartid, i);
> +
> + xmit->tstate = triggers[hartid][i + trig_idx_base].state.value;
> + xmit->tdata1 = triggers[hartid][i + trig_idx_base].tdata1;
> + xmit->tdata2 = triggers[hartid][i + trig_idx_base].tdata2;
> + xmit->tdata3 = triggers[hartid][i + trig_idx_base].tdata3;
> + }
> +
> + return SBI_SUCCESS;
> +}
> +
> +int sbi_dbtr_install_trig(const struct sbi_domain *dom, unsigned long smode,
> + unsigned long trig_count, unsigned long in_addr_div_by_16,
> + unsigned long out_addr_div_by_16, unsigned long *out)
> +{
> + unsigned long out_addr = (out_addr_div_by_16 << 4);
> + unsigned long in_addr = (in_addr_div_by_16 << 4);
> + u32 hartid = current_hartid();
> + struct sbi_dbtr_data_msg *recv;
> + struct sbi_dbtr_id_msg *xmit;
> + union riscv_dbtr_tdata1_mcontrol6 ctrl;
> + int i, k;
> +
> + if (smode != PRV_S)
> + return SBI_ERR_DENIED;
> + if (dom && !sbi_domain_is_assigned_hart(dom, hartid))
> + return SBI_ERR_DENIED;
> + if (dom && !sbi_domain_check_addr(dom, in_addr, smode, SBI_DOMAIN_READ | SBI_DOMAIN_WRITE))
> + return SBI_ERR_INVALID_ADDRESS;
> + if (dom && !sbi_domain_check_addr(dom, out_addr, smode, SBI_DOMAIN_READ | SBI_DOMAIN_WRITE))
> + return SBI_ERR_INVALID_ADDRESS;
> +
> + /* TODO: check chained triggers configurations */
> +
> + /* Check requested triggers configuration */
> + for (k = 0; k < trig_count; k++) {
> + recv = (struct sbi_dbtr_data_msg *)(in_addr + k * sizeof(*recv));
> + ctrl = (union riscv_dbtr_tdata1_mcontrol6)recv->tdata1;
> +
> + if (ctrl.type != RISCV_DBTR_TRIG_MCONTROL6) {
> + sbi_dprintf("%s: invalid type of trigger %d\n", __func__, k);
> + *out = k;
> + return SBI_ERR_FAILED;
> + }
> +
> + if (ctrl.action || ctrl.dmode || ctrl.m) {
> + sbi_dprintf("%s: invalid configuration of trigger %d\n", __func__, k);
> + *out = k;
> + return SBI_ERR_FAILED;
> + }
> + }
> +
> + /* Check if we have enough spare triggers */
> + for (i = 0, k = 0; i < total_trigs; i++) {
> + if (!triggers[hartid][i].state.mapped)
> + k++;
> + }
> +
> + if (k < trig_count) {
> + sbi_dprintf("%s: hartid%d: not enough spare triggers\n", __func__, hartid);
> + *out = k;
> + return SBI_ERR_FAILED;
> + }
> +
> + /* Install triggers */
> + for (i = 0, k = 0; i < total_trigs; i++) {
> + if (triggers[hartid][i].state.mapped)
> + continue;
> +
> + recv = (struct sbi_dbtr_data_msg *)(in_addr + k * sizeof(*recv));
> + xmit = (struct sbi_dbtr_id_msg *)(out_addr + k * sizeof(*xmit));
> +
> + sbi_dprintf("%s: hart%d: idx[%d] tdata1[0x%lx] tdata2[0x%lx]\n",
> + __func__, hartid, i, recv->tdata1, recv->tdata2);
> +
> + triggers[hartid][i].tdata1 = recv->tdata1;
> + triggers[hartid][i].tdata2 = recv->tdata2;
> + triggers[hartid][i].tdata3 = recv->tdata3;
> +
> + triggers[hartid][i].state.vu =
> + __test_bit(MCONTROL6_VU_OFFSET, &triggers[hartid][i].tdata1);
> + triggers[hartid][i].state.vs =
> + __test_bit(MCONTROL6_VS_OFFSET, &triggers[hartid][i].tdata1);
> + triggers[hartid][i].state.u =
> + __test_bit(MCONTROL6_U_OFFSET, &triggers[hartid][i].tdata1);
> + triggers[hartid][i].state.s =
> + __test_bit(MCONTROL6_S_OFFSET, &triggers[hartid][i].tdata1);
> + triggers[hartid][i].state.mapped = 1;
> +
> + dbtr_trigger_enable(hartid, i);
> + xmit->idx = i;
> +
> + if (++k >= trig_count)
> + break;
> + }
> +
> + return SBI_SUCCESS;
> +}
> +
> +int sbi_dbtr_uninstall_trig(unsigned long trig_idx_base, unsigned long trig_idx_mask)
> +{
> + unsigned long trig_mask = trig_idx_mask << trig_idx_base;
> + unsigned long idx = trig_idx_base;
> + u32 hartid = current_hartid();
> +
> + sbi_dprintf("%s: hart%d: triggers mask: 0x%lx\n",
> + __func__, hartid, trig_mask);
> +
> + for_each_set_bit_from(idx, &trig_mask, total_trigs) {
> + if (!triggers[hartid][idx].state.mapped) {
> + sbi_dprintf("%s: trigger %lu not mapped\n", __func__, idx);
> + return SBI_ERR_INVALID_PARAM;
> + }
> +
> + sbi_dprintf("%s: clear trigger %lu\n", __func__, idx);
> + dbtr_trigger_clear(hartid, idx);
> +
> + triggers[hartid][idx].state.value = 0;
> + triggers[hartid][idx].tdata1 = 0;
> + triggers[hartid][idx].tdata2 = 0;
> + triggers[hartid][idx].tdata3 = 0;
> + }
> +
> + return SBI_SUCCESS;
> +}
> +
> +int sbi_dbtr_enable_trig(unsigned long trig_idx_base, unsigned long trig_idx_mask)
> +{
> + unsigned long trig_mask = trig_idx_mask << trig_idx_base;
> + unsigned long idx = trig_idx_base;
> + u32 hartid = current_hartid();
> +
> + sbi_dprintf("%s: hart%d: triggers mask: 0x%lx\n",
> + __func__, hartid, trig_mask);
> +
> + for_each_set_bit_from(idx, &trig_mask, total_trigs) {
> + sbi_dprintf("%s: enable trigger %lu\n", __func__, idx);
> + dbtr_trigger_enable(hartid, idx);
> + }
> +
> + return SBI_SUCCESS;
> +}
> +
> +int sbi_dbtr_update_trig(const struct sbi_domain *dom, unsigned long smode,
> + unsigned long trig_idx_base, unsigned long trig_idx_mask,
> + unsigned long in_addr_div_by_16)
> +{
> + unsigned long in_addr = (in_addr_div_by_16 << 4);
> + unsigned long trig_mask = trig_idx_mask << trig_idx_base;
> + unsigned long idx = trig_idx_base;
> + u32 hartid = current_hartid();
> + struct sbi_dbtr_data_msg *recv;
> + unsigned long uidx = 0;
> +
> + sbi_dprintf("%s: hart%d: triggers mask: 0x%lx\n",
> + __func__, hartid, trig_mask);
> +
> + if (smode != PRV_S)
> + return SBI_ERR_DENIED;
> + if (dom && !sbi_domain_is_assigned_hart(dom, hartid))
> + return SBI_ERR_DENIED;
> + if (dom && !sbi_domain_check_addr(dom, in_addr, smode, SBI_DOMAIN_READ | SBI_DOMAIN_WRITE))
> + return SBI_ERR_INVALID_ADDRESS;
> +
> + for_each_set_bit_from(idx, &trig_mask, total_trigs) {
> + if (!triggers[hartid][idx].state.mapped) {
> + sbi_dprintf("%s: trigger %lu not mapped\n", __func__, idx);
> + return SBI_ERR_INVALID_PARAM;
> + }
> +
> + recv = (struct sbi_dbtr_data_msg *)(in_addr + uidx * sizeof(*recv));
> +
> + sbi_dprintf("%s: update trigger %lu: newaddr 0x%lx\n",
> + __func__, idx, recv->tdata2);
> +
> + triggers[hartid][idx].tdata2 = recv->tdata2;
> + dbtr_trigger_enable(hartid, idx);
> + uidx++;
> + }
> +
> + return SBI_SUCCESS;
> +}
> +
> +int sbi_dbtr_disable_trig(unsigned long trig_idx_base, unsigned long trig_idx_mask)
> +{
> + unsigned long trig_mask = trig_idx_mask << trig_idx_base;
> + unsigned long idx = trig_idx_base;
> + u32 hartid = current_hartid();
> +
> + sbi_dprintf("%s: hart%d: triggers mask: 0x%lx\n",
> + __func__, hartid, trig_mask);
> +
> + for_each_set_bit_from(idx, &trig_mask, total_trigs) {
> + sbi_dprintf("%s: disable trigger %lu\n", __func__, idx);
> + dbtr_trigger_disable(hartid, idx);
> + }
> +
> + return SBI_SUCCESS;
> +}
> diff --git a/lib/sbi/sbi_ecall_dbtr.c b/lib/sbi/sbi_ecall_dbtr.c
> new file mode 100644
> index 0000000..d013b3e
> --- /dev/null
> +++ b/lib/sbi/sbi_ecall_dbtr.c
> @@ -0,0 +1,68 @@
> +/*
> + * SPDX-License-Identifier: BSD-2-Clause
> + *
> + * Copyright (c) 2022 Syntacore
> + *
> + * Authors:
> + * Sergey Matyukevich <sergey.matyukevich at syntacore.com>
> + *
> + */
> +
> +#include <sbi/sbi_ecall_interface.h>
> +#include <sbi/sbi_ecall.h>
> +#include <sbi/sbi_domain.h>
> +#include <sbi/sbi_error.h>
> +#include <sbi/sbi_trap.h>
> +#include <sbi/sbi_version.h>
> +#include <sbi/sbi_dbtr.h>
> +
> +static int sbi_ecall_dbtr_handler(unsigned long extid, unsigned long funcid,
> + const struct sbi_trap_regs *regs,
> + unsigned long *out_val,
> + struct sbi_trap_info *out_trap)
> +{
> + unsigned long smode = (csr_read(CSR_MSTATUS) & MSTATUS_MPP) >>
> + MSTATUS_MPP_SHIFT;
> + const struct sbi_domain *dom = sbi_domain_thishart_ptr();
> + int ret = 0;
> +
> + switch (funcid) {
> + case SBI_EXT_DBTR_NUM_TRIGGERS:
> + ret = sbi_dbtr_num_trig(regs->a0, out_val);
> + break;
> + case SBI_EXT_DBTR_TRIGGER_READ:
> + ret = sbi_dbtr_read_trig(dom, smode, regs->a0, regs->a1, regs->a2);
> + break;
> + case SBI_EXT_DBTR_TRIGGER_INSTALL:
> + ret = sbi_dbtr_install_trig(dom, smode, regs->a0, regs->a1, regs->a2, out_val);
> + 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(dom, smode, regs->a0, regs->a1, regs->a2);
> + break;
> + case SBI_EXT_DBTR_TRIGGER_DISABLE:
> + ret = sbi_dbtr_disable_trig(regs->a0, regs->a1);
> + break;
> + default:
> + ret = SBI_ENOTSUPP;
> + };
> +
> + return ret;
> +}
> +
> +static int sbi_ecall_dbtr_probe(unsigned long extid, unsigned long *out_val)
> +{
> + return sbi_dbtr_probe(out_val);
> +}
> +
> +struct sbi_ecall_extension ecall_dbtr = {
> + .extid_start = SBI_EXT_DBTR,
> + .extid_end = SBI_EXT_DBTR,
> + .handle = sbi_ecall_dbtr_handler,
> + .probe = sbi_ecall_dbtr_probe,
> +};
> diff --git a/lib/sbi/sbi_init.c b/lib/sbi/sbi_init.c
> index a8500e5..956afae 100644
> --- a/lib/sbi/sbi_init.c
> +++ b/lib/sbi/sbi_init.c
> @@ -21,6 +21,7 @@
> #include <sbi/sbi_irqchip.h>
> #include <sbi/sbi_platform.h>
> #include <sbi/sbi_pmu.h>
> +#include <sbi/sbi_dbtr.h>
> #include <sbi/sbi_system.h>
> #include <sbi/sbi_string.h>
> #include <sbi/sbi_timer.h>
> @@ -275,6 +276,10 @@ static void __noreturn init_coldboot(struct sbi_scratch *scratch, u32 hartid)
> if (rc)
> sbi_hart_hang();
>
> + rc = sbi_dbtr_init(scratch);
> + if (rc)
> + sbi_hart_hang();
> +
> sbi_boot_print_banner(scratch);
>
> rc = sbi_irqchip_init(scratch, TRUE);
> @@ -380,6 +385,10 @@ static void init_warm_startup(struct sbi_scratch *scratch, u32 hartid)
> if (rc)
> sbi_hart_hang();
>
> + rc = sbi_dbtr_init(scratch);
> + if (rc)
> + sbi_hart_hang();
> +
> rc = sbi_irqchip_init(scratch, FALSE);
> if (rc)
> sbi_hart_hang();
> --
> 2.38.1
>
>
> --
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