From: Andrew Jones <ajones@ventanamicro.com>
To: Himanshu Chauhan <hchauhan@ventanamicro.com>
Cc: qemu-riscv@nongnu.org, qemu-devel@nongnu.org
Subject: Re: [PATCH v5 1/3] target/riscv: Enable mcontrol6 triggers only when sdtrig is selected
Date: Wed, 13 Mar 2024 20:06:25 +0100 [thread overview]
Message-ID: <20240313-7736ce7e5110189807de2287@orel> (raw)
In-Reply-To: <20240313182009.608685-2-hchauhan@ventanamicro.com>
On Wed, Mar 13, 2024 at 11:50:07PM +0530, Himanshu Chauhan wrote:
> The mcontrol6 triggers are not defined in debug specification v0.13
> These triggers are defined in sdtrig ISA extension.
>
> This patch:
> * Adds ext_sdtrig capability which is used to select mcontrol6 triggers
> * Keeps the debug property. All triggers that are defined in v0.13 are
> exposed.
>
> Signed-off-by: Himanshu Chauhan <hchauhan@ventanamicro.com>
> ---
> target/riscv/cpu.c | 4 +-
> target/riscv/cpu_cfg.h | 1 +
> target/riscv/csr.c | 2 +-
> target/riscv/debug.c | 90 +++++++++++++++++++++++++-----------------
> target/riscv/machine.c | 2 +-
> 5 files changed, 58 insertions(+), 41 deletions(-)
>
> diff --git a/target/riscv/cpu.c b/target/riscv/cpu.c
> index c160b9216b..2602aae9f5 100644
> --- a/target/riscv/cpu.c
> +++ b/target/riscv/cpu.c
> @@ -1008,7 +1008,7 @@ static void riscv_cpu_reset_hold(Object *obj)
> set_default_nan_mode(1, &env->fp_status);
>
> #ifndef CONFIG_USER_ONLY
> - if (cpu->cfg.debug) {
> + if (cpu->cfg.debug || cpu->cfg.ext_sdtrig) {
> riscv_trigger_reset_hold(env);
> }
>
> @@ -1168,7 +1168,7 @@ static void riscv_cpu_realize(DeviceState *dev, Error **errp)
> riscv_cpu_register_gdb_regs_for_features(cs);
>
> #ifndef CONFIG_USER_ONLY
> - if (cpu->cfg.debug) {
> + if (cpu->cfg.debug || cpu->cfg.ext_sdtrig) {
> riscv_trigger_realize(&cpu->env);
> }
> #endif
> diff --git a/target/riscv/cpu_cfg.h b/target/riscv/cpu_cfg.h
> index 2040b90da0..0c57e1acd4 100644
> --- a/target/riscv/cpu_cfg.h
> +++ b/target/riscv/cpu_cfg.h
> @@ -114,6 +114,7 @@ struct RISCVCPUConfig {
> bool ext_zvfbfwma;
> bool ext_zvfh;
> bool ext_zvfhmin;
> + bool ext_sdtrig;
> bool ext_smaia;
> bool ext_ssaia;
> bool ext_sscofpmf;
> diff --git a/target/riscv/csr.c b/target/riscv/csr.c
> index 726096444f..26623d3640 100644
> --- a/target/riscv/csr.c
> +++ b/target/riscv/csr.c
> @@ -546,7 +546,7 @@ static RISCVException have_mseccfg(CPURISCVState *env, int csrno)
>
> static RISCVException debug(CPURISCVState *env, int csrno)
> {
> - if (riscv_cpu_cfg(env)->debug) {
> + if (riscv_cpu_cfg(env)->debug || riscv_cpu_cfg(env)->ext_sdtrig) {
> return RISCV_EXCP_NONE;
> }
>
> diff --git a/target/riscv/debug.c b/target/riscv/debug.c
> index e30d99cc2f..674223e966 100644
> --- a/target/riscv/debug.c
> +++ b/target/riscv/debug.c
> @@ -100,13 +100,15 @@ static trigger_action_t get_trigger_action(CPURISCVState *env,
> target_ulong tdata1 = env->tdata1[trigger_index];
> int trigger_type = get_trigger_type(env, trigger_index);
> trigger_action_t action = DBG_ACTION_NONE;
> + const RISCVCPUConfig *cfg = riscv_cpu_cfg(env);
>
> switch (trigger_type) {
> case TRIGGER_TYPE_AD_MATCH:
> action = (tdata1 & TYPE2_ACTION) >> 12;
> break;
> case TRIGGER_TYPE_AD_MATCH6:
> - action = (tdata1 & TYPE6_ACTION) >> 12;
> + if (cfg->ext_sdtrig)
> + action = (tdata1 & TYPE6_ACTION) >> 12;
> break;
> case TRIGGER_TYPE_INST_CNT:
> case TRIGGER_TYPE_INT:
> @@ -727,7 +729,12 @@ void tdata_csr_write(CPURISCVState *env, int tdata_index, target_ulong val)
> type2_reg_write(env, env->trigger_cur, tdata_index, val);
> break;
> case TRIGGER_TYPE_AD_MATCH6:
> - type6_reg_write(env, env->trigger_cur, tdata_index, val);
> + if (riscv_cpu_cfg(env)->ext_sdtrig) {
> + type6_reg_write(env, env->trigger_cur, tdata_index, val);
> + } else {
> + qemu_log_mask(LOG_UNIMP, "trigger type: %d is not supported\n",
> + trigger_type);
> + }
> break;
> case TRIGGER_TYPE_INST_CNT:
> itrigger_reg_write(env, env->trigger_cur, tdata_index, val);
> @@ -750,9 +757,14 @@ void tdata_csr_write(CPURISCVState *env, int tdata_index, target_ulong val)
>
> target_ulong tinfo_csr_read(CPURISCVState *env)
> {
> - /* assume all triggers support the same types of triggers */
> - return BIT(TRIGGER_TYPE_AD_MATCH) |
> - BIT(TRIGGER_TYPE_AD_MATCH6);
> + target_ulong ts = 0;
> +
> + ts = BIT(TRIGGER_TYPE_AD_MATCH);
> +
> + if (riscv_cpu_cfg(env)->ext_sdtrig)
> + ts |= BIT(TRIGGER_TYPE_AD_MATCH6);
> +
> + return ts;
> }
>
> void riscv_cpu_debug_excp_handler(CPUState *cs)
> @@ -803,19 +815,21 @@ bool riscv_cpu_debug_check_breakpoint(CPUState *cs)
> }
> break;
> case TRIGGER_TYPE_AD_MATCH6:
> - ctrl = env->tdata1[i];
> - pc = env->tdata2[i];
> -
> - if ((ctrl & TYPE6_EXEC) && (bp->pc == pc)) {
> - if (env->virt_enabled) {
> - /* check VU/VS bit against current privilege level */
> - if ((ctrl >> 23) & BIT(env->priv)) {
> - return true;
> - }
> - } else {
> - /* check U/S/M bit against current privilege level */
> - if ((ctrl >> 3) & BIT(env->priv)) {
> - return true;
> + if (cpu->cfg.ext_sdtrig) {
> + ctrl = env->tdata1[i];
> + pc = env->tdata2[i];
> +
> + if ((ctrl & TYPE6_EXEC) && (bp->pc == pc)) {
> + if (env->virt_enabled) {
> + /* check VU/VS bit against current privilege level */
> + if ((ctrl >> 23) & BIT(env->priv)) {
> + return true;
> + }
> + } else {
> + /* check U/S/M bit against current privilege level */
> + if ((ctrl >> 3) & BIT(env->priv)) {
> + return true;
> + }
> }
> }
> }
> @@ -869,27 +883,29 @@ bool riscv_cpu_debug_check_watchpoint(CPUState *cs, CPUWatchpoint *wp)
> }
> break;
> case TRIGGER_TYPE_AD_MATCH6:
> - ctrl = env->tdata1[i];
> - addr = env->tdata2[i];
> - flags = 0;
> + if (cpu->cfg.ext_sdtrig) {
> + ctrl = env->tdata1[i];
> + addr = env->tdata2[i];
> + flags = 0;
>
> - if (ctrl & TYPE6_LOAD) {
> - flags |= BP_MEM_READ;
> - }
> - if (ctrl & TYPE6_STORE) {
> - flags |= BP_MEM_WRITE;
> - }
> + if (ctrl & TYPE6_LOAD) {
> + flags |= BP_MEM_READ;
> + }
> + if (ctrl & TYPE6_STORE) {
> + flags |= BP_MEM_WRITE;
> + }
>
> - if ((wp->flags & flags) && (wp->vaddr == addr)) {
> - if (env->virt_enabled) {
> - /* check VU/VS bit against current privilege level */
> - if ((ctrl >> 23) & BIT(env->priv)) {
> - return true;
> - }
> - } else {
> - /* check U/S/M bit against current privilege level */
> - if ((ctrl >> 3) & BIT(env->priv)) {
> - return true;
> + if ((wp->flags & flags) && (wp->vaddr == addr)) {
> + if (env->virt_enabled) {
> + /* check VU/VS bit against current privilege level */
> + if ((ctrl >> 23) & BIT(env->priv)) {
> + return true;
> + }
> + } else {
> + /* check U/S/M bit against current privilege level */
> + if ((ctrl >> 3) & BIT(env->priv)) {
> + return true;
> + }
> }
> }
> }
> diff --git a/target/riscv/machine.c b/target/riscv/machine.c
> index 76f2150f78..383151a4f8 100644
> --- a/target/riscv/machine.c
> +++ b/target/riscv/machine.c
> @@ -230,7 +230,7 @@ static bool debug_needed(void *opaque)
> {
> RISCVCPU *cpu = opaque;
>
> - return cpu->cfg.debug;
> + return cpu->cfg.debug || cpu->cfg.ext_sdtrig;
> }
>
> static int debug_post_load(void *opaque, int version_id)
> --
> 2.34.1
>
>
afaict we never have if cfg.debug without '|| cfg.ext_sdtrig', so I
maintain that we don't need to add the '|| cfg.ext_sdtrig' now that we
ensure debug is set when ext_sdtrig is set.
Thanks,
drew
next prev parent reply other threads:[~2024-03-13 19:07 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-13 18:20 [PATCH v5 0/3] Introduce sdtrig ISA extension Himanshu Chauhan
2024-03-13 18:20 ` [PATCH v5 1/3] target/riscv: Enable mcontrol6 triggers only when sdtrig is selected Himanshu Chauhan
2024-03-13 19:06 ` Andrew Jones [this message]
2024-03-13 18:20 ` [PATCH v5 2/3] target/riscv: Expose sdtrig ISA extension Himanshu Chauhan
2024-03-13 19:13 ` Andrew Jones
2024-03-13 18:20 ` [PATCH v5 3/3] target/riscv: Enable sdtrig for Ventana's Veyron CPUs Himanshu Chauhan
2024-03-13 19:15 ` Andrew Jones
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20240313-7736ce7e5110189807de2287@orel \
--to=ajones@ventanamicro.com \
--cc=hchauhan@ventanamicro.com \
--cc=qemu-devel@nongnu.org \
--cc=qemu-riscv@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).