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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists1p.gnu.org; Received-SPF: pass client-ip=205.220.168.131; envelope-from=brian.cain@oss.qualcomm.com; helo=mx0a-0031df01.pphosted.com X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @qualcomm.com) X-ZM-MESSAGEID: 1781156164496158500 From: Brian Cain The hardware-assisted scheduler helps manage tasks on the run queue and interrupt steering. Reviewed-by: Pierrick Bouvier Signed-off-by: Brian Cain --- target/hexagon/op_helper.c | 77 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) diff --git a/target/hexagon/op_helper.c b/target/hexagon/op_helper.c index 2bc1f0d313b..cbc5a604c2e 100644 --- a/target/hexagon/op_helper.c +++ b/target/hexagon/op_helper.c @@ -1589,6 +1589,64 @@ static void hexagon_wait_thread(CPUHexagonState *env= , uint32_t PC) cpu_interrupt(cs, CPU_INTERRUPT_HALT); } =20 +static inline QEMU_ALWAYS_INLINE void resched(CPUHexagonState *env) +{ + uint32_t schedcfg; + uint32_t schedcfg_en; + int int_number; + CPUState *cs; + uint32_t lowest_th_prio =3D 0; /* 0 is highest prio */ + uint32_t bestwait_reg; + uint32_t best_prio; + HexagonCPU *cpu; + + BQL_LOCK_GUARD(); + qemu_log_mask(CPU_LOG_INT, "%s: check resched\n", __func__); + cpu =3D env_archcpu(env); + schedcfg =3D cpu->globalregs ? + hexagon_globalreg_read(cpu->globalregs, HEX_SREG_SCHEDCFG, + env->threadId) : 0; + schedcfg_en =3D GET_FIELD(SCHEDCFG_EN, schedcfg); + int_number =3D GET_FIELD(SCHEDCFG_INTNO, schedcfg); + + if (!schedcfg_en) { + return; + } + + CPU_FOREACH(cs) { + HexagonCPU *thread =3D HEXAGON_CPU(cs); + CPUHexagonState *thread_env =3D &(thread->env); + uint32_t th_prio =3D GET_FIELD( + STID_PRIO, thread_env->t_sreg[HEX_SREG_STID]); + if (!hexagon_thread_is_enabled(thread_env)) { + continue; + } + + lowest_th_prio =3D (lowest_th_prio > th_prio) + ? lowest_th_prio + : th_prio; + } + + bestwait_reg =3D cpu->globalregs ? + hexagon_globalreg_read(cpu->globalregs, HEX_SREG_BESTWAIT, + env->threadId) : 0; + best_prio =3D GET_FIELD(BESTWAIT_PRIO, bestwait_reg); + + /* + * If the lowest priority thread is lower priority than the + * value in the BESTWAIT register, we must raise the reschedule + * interrupt on the lowest priority thread. + */ + if (lowest_th_prio > best_prio) { + qemu_log_mask(CPU_LOG_INT, + "%s: raising resched int %u," + " cur PC 0x%" PRIx32 "\n", + __func__, (unsigned)int_number, env->gpr[HEX_REG_PC]); + SET_SYSTEM_FIELD(env, HEX_SREG_BESTWAIT, BESTWAIT_PRIO, ~0); + hex_raise_interrupts(env, 1 << int_number, CPU_INTERRUPT_SWI); + } +} + void HELPER(wait)(CPUHexagonState *env, uint32_t PC) { BQL_LOCK_GUARD(); @@ -1697,8 +1755,27 @@ uint64_t HELPER(greg_read_pair)(CPUHexagonState *env= , uint32_t reg) g_assert_not_reached(); } =20 +/* + * setprio/resched - hardware-assisted scheduler helpers for managing + * the run queue and interrupt steering. + */ void HELPER(setprio)(CPUHexagonState *env, uint32_t thread, uint32_t prio) { + CPUState *cs; + + BQL_LOCK_GUARD(); + CPU_FOREACH(cs) { + HexagonCPU *found_cpu =3D HEXAGON_CPU(cs); + CPUHexagonState *found_env =3D &found_cpu->env; + if (thread =3D=3D found_env->threadId) { + SET_SYSTEM_FIELD(found_env, HEX_SREG_STID, STID_PRIO, prio); + qemu_log_mask(CPU_LOG_INT, + "%s: tid %" PRIu32 " prio =3D 0x%" PRIx32 "\n", + __func__, found_env->threadId, prio); + resched(env); + return; + } + } g_assert_not_reached(); } =20 --=20 2.34.1