{"id":2221067,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2221067/?format=json","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.0/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260408041953.1899532-16-brian.cain@oss.qualcomm.com>","date":"2026-04-08T04:19:40","name":"[v4,15/28] target/hexagon: Implement setprio, resched","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"d3b3a58b0e243ec23fca0b4e773a9773dfca9009","submitter":{"id":89839,"url":"http://patchwork.ozlabs.org/api/1.0/people/89839/?format=json","name":"Brian Cain","email":"brian.cain@oss.qualcomm.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260408041953.1899532-16-brian.cain@oss.qualcomm.com/mbox/","series":[{"id":499179,"url":"http://patchwork.ozlabs.org/api/1.0/series/499179/?format=json","date":"2026-04-08T04:19:31","name":"Hexagon system emulation - Part 2/3","version":4,"mbox":"http://patchwork.ozlabs.org/series/499179/mbox/"}],"check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2221067/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=qualcomm.com header.i=@qualcomm.com header.a=rsa-sha256\n header.s=qcppdkim1 header.b=SXkFPeH/;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=oss.qualcomm.com header.i=@oss.qualcomm.com\n header.a=rsa-sha256 header.s=google header.b=LnMa75iV;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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charset=\"utf-8\"","Content-Transfer-Encoding":"base64","X-Proofpoint-ORIG-GUID":"QTKiXLWHv2a9UV7yeXNSIwD7UO4cQkGx","X-Proofpoint-Spam-Details-Enc":"AW1haW4tMjYwNDA4MDAzNiBTYWx0ZWRfX/Jjj3IcLKVKS\n iguZqe2Y0D8TzqJSJn1q2mOmtWFLrMmiwEjJLcsYi52KxIj4zcAVnnmO2+DDTBte8kaYZouUtwE\n gBwHWJRA6DfJP3C20NNIbgnpQzWScVu3Y7/h3BnTk+OKPStzrhmJuffqsko76bV2ZV/IOH6zG20\n PMjJLmwhxzETd0j0keq2BXS6qrUxFvOobaywA4XCu2YprmICuUleHkNVILO5p1eVhCThwEAT9jh\n TSVoxP+tFN6lVVl213u2ZqR6Tq0FCiUvtikEBHogqnYD39goKvJFkbwPu3Sj65KylQPKXIqBLIc\n kkzDAIzVaILt0Zei0mvHippVSuhUUoDeKmk65Qamk2edmmE9lxkvugmpXOyD6bS9mpRrnEXw+P7\n S+Mx62n7HA+dlmWSIOgCSuy+LkrIkrUoSolKr/RR1C0Dy7pqu4IOnLZsjfiNwu9kE00QZ0rM6fK\n akCElDDo7PIB6x//PKw==","X-Authority-Analysis":"v=2.4 cv=GN041ONK c=1 sm=1 tr=0 ts=69d5d788 cx=c_pps\n a=SvEPeNj+VMjHSW//kvnxuw==:117 a=ouPCqIW2jiPt+lZRy3xVPw==:17\n a=IkcTkHD0fZMA:10 a=A5OVakUREuEA:10 a=s4-Qcg_JpJYA:10\n a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=DJpcGTmdVt4CTyJn9g5Z:22\n a=COk6AnOGAAAA:8 a=EUspDBNiAAAA:8 a=9hY_xzidxOicKg_qOOkA:9 a=QEXdDO2ut3YA:10\n a=Kq8ClHjjuc5pcCNDwlU0:22 a=TjNXssC_j7lpFel5tvFf:22","X-Proofpoint-GUID":"QTKiXLWHv2a9UV7yeXNSIwD7UO4cQkGx","X-Proofpoint-Virus-Version":"vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-08_02,2026-04-07_05,2025-10-01_01","X-Proofpoint-Spam-Details":"rule=outbound_notspam policy=outbound score=0\n lowpriorityscore=0 priorityscore=1501 phishscore=0 suspectscore=0\n clxscore=1015 spamscore=0 adultscore=0 bulkscore=0 impostorscore=0\n malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc=\n route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604010000\n definitions=main-2604080036","Received-SPF":"pass client-ip=205.220.168.131;\n 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,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001,\n RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001,\n 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":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"From: Brian Cain \n\nThe hardware-assisted scheduler helps manage tasks on the run queue\nand interrupt steering.\n\nSigned-off-by: Brian Cain \n---\n target/hexagon/op_helper.c | 77 ++++++++++++++++++++++++++++++++++++++\n 1 file changed, 77 insertions(+)","diff":"diff --git a/target/hexagon/op_helper.c b/target/hexagon/op_helper.c\nindex 64f1fb2043f..74a04398aa1 100644\n--- a/target/hexagon/op_helper.c\n+++ b/target/hexagon/op_helper.c\n@@ -1589,6 +1589,64 @@ static void hexagon_wait_thread(CPUHexagonState *env, uint32_t PC)\n cpu_interrupt(cs, CPU_INTERRUPT_HALT);\n }\n \n+static inline QEMU_ALWAYS_INLINE void resched(CPUHexagonState *env)\n+{\n+ uint32_t schedcfg;\n+ uint32_t schedcfg_en;\n+ int int_number;\n+ CPUState *cs;\n+ uint32_t lowest_th_prio = 0; /* 0 is highest prio */\n+ uint32_t bestwait_reg;\n+ uint32_t best_prio;\n+ HexagonCPU *cpu;\n+\n+ BQL_LOCK_GUARD();\n+ qemu_log_mask(CPU_LOG_INT, \"%s: check resched\\n\", __func__);\n+ cpu = env_archcpu(env);\n+ schedcfg = cpu->globalregs ?\n+ hexagon_globalreg_read(cpu->globalregs, HEX_SREG_SCHEDCFG,\n+ env->threadId) : 0;\n+ schedcfg_en = GET_FIELD(SCHEDCFG_EN, schedcfg);\n+ int_number = GET_FIELD(SCHEDCFG_INTNO, schedcfg);\n+\n+ if (!schedcfg_en) {\n+ return;\n+ }\n+\n+ CPU_FOREACH(cs) {\n+ HexagonCPU *thread = HEXAGON_CPU(cs);\n+ CPUHexagonState *thread_env = &(thread->env);\n+ uint32_t th_prio = GET_FIELD(\n+ STID_PRIO, thread_env->t_sreg[HEX_SREG_STID]);\n+ if (!hexagon_thread_is_enabled(thread_env)) {\n+ continue;\n+ }\n+\n+ lowest_th_prio = (lowest_th_prio > th_prio)\n+ ? lowest_th_prio\n+ : th_prio;\n+ }\n+\n+ bestwait_reg = cpu->globalregs ?\n+ hexagon_globalreg_read(cpu->globalregs, HEX_SREG_BESTWAIT,\n+ env->threadId) : 0;\n+ best_prio = GET_FIELD(BESTWAIT_PRIO, bestwait_reg);\n+\n+ /*\n+ * If the lowest priority thread is lower priority than the\n+ * value in the BESTWAIT register, we must raise the reschedule\n+ * interrupt on the lowest priority thread.\n+ */\n+ if (lowest_th_prio > best_prio) {\n+ qemu_log_mask(CPU_LOG_INT,\n+ \"%s: raising resched int %d,\"\n+ \" cur PC 0x%\" PRIx32 \"\\n\",\n+ __func__, int_number, env->gpr[HEX_REG_PC]);\n+ SET_SYSTEM_FIELD(env, HEX_SREG_BESTWAIT, BESTWAIT_PRIO, ~0);\n+ hex_raise_interrupts(env, 1 << int_number, CPU_INTERRUPT_SWI);\n+ }\n+}\n+\n void HELPER(wait)(CPUHexagonState *env, uint32_t PC)\n {\n BQL_LOCK_GUARD();\n@@ -1697,8 +1755,27 @@ uint64_t HELPER(greg_read_pair)(CPUHexagonState *env, uint32_t reg)\n g_assert_not_reached();\n }\n \n+/*\n+ * setprio/resched - See the Hexagon V73 Programmer's Reference Manual,\n+ * Section 6.4 \"Interrupt and Thread Scheduling\"\n+ */\n void HELPER(setprio)(CPUHexagonState *env, uint32_t thread, uint32_t prio)\n {\n+ CPUState *cs;\n+\n+ BQL_LOCK_GUARD();\n+ CPU_FOREACH(cs) {\n+ HexagonCPU *found_cpu = HEXAGON_CPU(cs);\n+ CPUHexagonState *found_env = &found_cpu->env;\n+ if (thread == found_env->threadId) {\n+ SET_SYSTEM_FIELD(found_env, HEX_SREG_STID, STID_PRIO, prio);\n+ qemu_log_mask(CPU_LOG_INT,\n+ \"%s: tid %\" PRIu32 \" prio = 0x%\" PRIx32 \"\\n\",\n+ __func__, found_env->threadId, prio);\n+ resched(env);\n+ return;\n+ }\n+ }\n g_assert_not_reached();\n }\n \n","prefixes":["v4","15/28"]}