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Tue, 07 Apr 2026 21:20:23 -0700 (PDT) X-Received: by 2002:a05:7022:43a8:b0:11b:9b98:aa4b with SMTP id a92af1059eb24-12bfb6ec461mr9948628c88.6.1775622023009; Tue, 07 Apr 2026 21:20:23 -0700 (PDT) From: Brian Cain To: qemu-devel@nongnu.org Cc: brian.cain@oss.qualcomm.com, philmd@linaro.org, ltaylorsimpson@gmail.com, matheus.bernardino@oss.qualcomm.com, marco.liebel@oss.qualcomm.com, quic_mburton@quicinc.com, sid.manning@oss.qualcomm.com, ale@rev.ng, anjo@rev.ng, Brian Cain Subject: [PATCH v4 15/28] target/hexagon: Implement setprio, resched Date: Tue, 7 Apr 2026 21:19:40 -0700 Message-Id: <20260408041953.1899532-16-brian.cain@oss.qualcomm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260408041953.1899532-1-brian.cain@oss.qualcomm.com> References: <20260408041953.1899532-1-brian.cain@oss.qualcomm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Proofpoint-ORIG-GUID: QTKiXLWHv2a9UV7yeXNSIwD7UO4cQkGx X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA4MDAzNiBTYWx0ZWRfX/Jjj3IcLKVKS iguZqe2Y0D8TzqJSJn1q2mOmtWFLrMmiwEjJLcsYi52KxIj4zcAVnnmO2+DDTBte8kaYZouUtwE gBwHWJRA6DfJP3C20NNIbgnpQzWScVu3Y7/h3BnTk+OKPStzrhmJuffqsko76bV2ZV/IOH6zG20 PMjJLmwhxzETd0j0keq2BXS6qrUxFvOobaywA4XCu2YprmICuUleHkNVILO5p1eVhCThwEAT9jh TSVoxP+tFN6lVVl213u2ZqR6Tq0FCiUvtikEBHogqnYD39goKvJFkbwPu3Sj65KylQPKXIqBLIc kkzDAIzVaILt0Zei0mvHippVSuhUUoDeKmk65Qamk2edmmE9lxkvugmpXOyD6bS9mpRrnEXw+P7 S+Mx62n7HA+dlmWSIOgCSuy+LkrIkrUoSolKr/RR1C0Dy7pqu4IOnLZsjfiNwu9kE00QZ0rM6fK akCElDDo7PIB6x//PKw== X-Authority-Analysis: v=2.4 cv=GN041ONK c=1 sm=1 tr=0 ts=69d5d788 cx=c_pps a=SvEPeNj+VMjHSW//kvnxuw==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17 a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22 a=COk6AnOGAAAA:8 a=EUspDBNiAAAA:8 a=9hY_xzidxOicKg_qOOkA:9 a=QEXdDO2ut3YA:10 a=Kq8ClHjjuc5pcCNDwlU0:22 a=TjNXssC_j7lpFel5tvFf:22 X-Proofpoint-GUID: QTKiXLWHv2a9UV7yeXNSIwD7UO4cQkGx X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-04-08_02,2026-04-07_05,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 suspectscore=0 clxscore=1015 spamscore=0 adultscore=0 bulkscore=0 impostorscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604080036 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.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_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=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: 1775673836980154100 From: Brian Cain The hardware-assisted scheduler helps manage tasks on the run queue and interrupt steering. 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 64f1fb2043f..74a04398aa1 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 %d," + " cur PC 0x%" PRIx32 "\n", + __func__, 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 - See the Hexagon V73 Programmer's Reference Manual, + * Section 6.4 "Interrupt and Thread Scheduling" + */ 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