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GET /api/1.0/patches/2221152/?format=api
{ "id": 2221152, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2221152/?format=api", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.0/projects/14/?format=api", "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": "<20260408041953.1899532-25-brian.cain@oss.qualcomm.com>", "date": "2026-04-08T04:19:49", "name": "[v4,24/28] target/hexagon: Add k0 {un,}lock", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "e0c4a96ae5b7ac28cb4237c5e2f96a9690e03567", "submitter": { "id": 89839, "url": "http://patchwork.ozlabs.org/api/1.0/people/89839/?format=api", "name": "Brian Cain", "email": "brian.cain@oss.qualcomm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260408041953.1899532-25-brian.cain@oss.qualcomm.com/mbox/", "series": [ { "id": 499179, "url": "http://patchwork.ozlabs.org/api/1.0/series/499179/?format=api", "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/2221152/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "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=a9iW065r;\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=eGmhiKWC;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n 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a92af1059eb24-12bf08803c9mr10028687c88.17.1775622033740;\n Tue, 07 Apr 2026 21:20:33 -0700 (PDT)", "by 2002:a05:7022:628b:b0:11f:1e5b:2dd6 with SMTP id\n a92af1059eb24-12bf08803c9mr10028672c88.17.1775622033151;\n Tue, 07 Apr 2026 21:20:33 -0700 (PDT)" ], "From": "Brian Cain <brian.cain@oss.qualcomm.com>", "To": "qemu-devel@nongnu.org", "Cc": "brian.cain@oss.qualcomm.com, philmd@linaro.org, ltaylorsimpson@gmail.com,\n matheus.bernardino@oss.qualcomm.com, marco.liebel@oss.qualcomm.com,\n quic_mburton@quicinc.com, sid.manning@oss.qualcomm.com, ale@rev.ng,\n anjo@rev.ng, Brian Cain <bcain@quicinc.com>", "Subject": "[PATCH v4 24/28] target/hexagon: Add k0 {un,}lock", "Date": "Tue, 7 Apr 2026 21:19:49 -0700", "Message-Id": "<20260408041953.1899532-25-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", 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"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 <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "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 <bcain@quicinc.com>\n\nReviewed-by: Taylor Simpson <ltaylorsimpson@gmail.com>\nSigned-off-by: Brian Cain <brian.cain@oss.qualcomm.com>\n---\n target/hexagon/sys_macros.h | 3 +\n target/hexagon/op_helper.c | 119 ++++++++++++++++++++++++++++++++++++\n 2 files changed, 122 insertions(+)", "diff": "diff --git a/target/hexagon/sys_macros.h b/target/hexagon/sys_macros.h\nindex cbc857fa2f5..37aae71adce 100644\n--- a/target/hexagon/sys_macros.h\n+++ b/target/hexagon/sys_macros.h\n@@ -146,6 +146,9 @@\n #define fSET_TLB_LOCK() hex_tlb_lock(env);\n #define fCLEAR_TLB_LOCK() hex_tlb_unlock(env);\n \n+#define fSET_K0_LOCK() hex_k0_lock(env);\n+#define fCLEAR_K0_LOCK() hex_k0_unlock(env);\n+\n #define fTLB_IDXMASK(INDEX) \\\n ((INDEX) & (fPOW2_ROUNDUP( \\\n fCAST4u(hexagon_tlb_get_num_entries(env_archcpu(env)->tlb))) - 1))\ndiff --git a/target/hexagon/op_helper.c b/target/hexagon/op_helper.c\nindex 26d32ab9d47..aeea4715372 100644\n--- a/target/hexagon/op_helper.c\n+++ b/target/hexagon/op_helper.c\n@@ -36,6 +36,9 @@\n #include \"cpu_helper.h\"\n #include \"translate.h\"\n #ifndef CONFIG_USER_ONLY\n+#include \"hw/hexagon/hexagon_globalreg.h\"\n+#include \"hex_mmu.h\"\n+#include \"hw/hexagon/hexagon_tlb.h\"\n #include \"hex_interrupts.h\"\n #include \"hexswi.h\"\n #endif\n@@ -1232,6 +1235,122 @@ void HELPER(modify_ssr)(CPUHexagonState *env, uint32_t new, uint32_t old)\n BQL_LOCK_GUARD();\n hexagon_modify_ssr(env, new, old);\n }\n+\n+static void hex_k0_lock(CPUHexagonState *env)\n+{\n+ HexagonCPU *cpu = env_archcpu(env);\n+ CPUState *cs = env_cpu(env);\n+ target_ulong syscfg;\n+\n+ BQL_LOCK_GUARD();\n+ g_assert((env->k0_lock_count == 0) || (env->k0_lock_count == 1));\n+\n+ syscfg = cpu->globalregs ?\n+ hexagon_globalreg_read(cpu->globalregs, HEX_SREG_SYSCFG,\n+ env->threadId) : 0;\n+ if (GET_SYSCFG_FIELD(SYSCFG_K0LOCK, syscfg)) {\n+ if (env->k0_lock_state == HEX_LOCK_QUEUED) {\n+ env->next_PC += 4;\n+ env->k0_lock_count++;\n+ env->k0_lock_state = HEX_LOCK_OWNER;\n+ SET_SYSCFG_FIELD(env, SYSCFG_K0LOCK, 1);\n+ return;\n+ }\n+ if (env->k0_lock_state == HEX_LOCK_OWNER) {\n+ qemu_log_mask(LOG_GUEST_ERROR,\n+ \"Double k0lock at PC: 0x%\" PRIx32\n+ \", thread may hang\\n\",\n+ env->next_PC);\n+ env->next_PC += 4;\n+ cpu_interrupt(cs, CPU_INTERRUPT_HALT);\n+ cpu_loop_exit(cs);\n+ return;\n+ }\n+ env->k0_lock_state = HEX_LOCK_WAITING;\n+ cpu_interrupt(cs, CPU_INTERRUPT_HALT);\n+ cpu_loop_exit(cs);\n+ } else {\n+ env->next_PC += 4;\n+ env->k0_lock_count++;\n+ env->k0_lock_state = HEX_LOCK_OWNER;\n+ SET_SYSCFG_FIELD(env, SYSCFG_K0LOCK, 1);\n+ }\n+}\n+\n+static void hex_k0_unlock(CPUHexagonState *env)\n+{\n+ HexagonCPU *cpu = env_archcpu(env);\n+ unsigned int this_threadId = env->threadId;\n+ CPUHexagonState *unlock_thread = NULL;\n+ CPUState *cs;\n+ target_ulong syscfg;\n+\n+ BQL_LOCK_GUARD();\n+ g_assert((env->k0_lock_count == 0) || (env->k0_lock_count == 1));\n+\n+ /* Nothing to do if the k0 isn't locked by this thread */\n+ syscfg = cpu->globalregs ?\n+ hexagon_globalreg_read(cpu->globalregs, HEX_SREG_SYSCFG,\n+ env->threadId) : 0;\n+ if ((GET_SYSCFG_FIELD(SYSCFG_K0LOCK, syscfg) == 0) ||\n+ (env->k0_lock_state != HEX_LOCK_OWNER)) {\n+ qemu_log_mask(LOG_GUEST_ERROR,\n+ \"thread %\" PRIu32 \" attempted to unlock k0 without\"\n+ \" having the lock, k0_lock state = %d,\"\n+ \" syscfg:k0 = %\" PRIu32 \"\\n\",\n+ env->threadId, env->k0_lock_state,\n+ (uint32_t)GET_SYSCFG_FIELD(SYSCFG_K0LOCK, syscfg));\n+ g_assert(env->k0_lock_state != HEX_LOCK_WAITING);\n+ return;\n+ }\n+\n+ env->k0_lock_count--;\n+ env->k0_lock_state = HEX_LOCK_UNLOCKED;\n+ SET_SYSCFG_FIELD(env, SYSCFG_K0LOCK, 0);\n+\n+ /* Look for a thread to unlock */\n+ CPU_FOREACH(cs) {\n+ CPUHexagonState *thread = cpu_env(cs);\n+\n+ /*\n+ * The hardware implements round-robin fairness, so we look for threads\n+ * starting at env->threadId + 1 and incrementing modulo the number of\n+ * threads.\n+ *\n+ * To implement this, we check if thread is a earlier in the modulo\n+ * sequence than unlock_thread.\n+ * if unlock thread is higher than this thread\n+ * thread must be between this thread and unlock_thread\n+ * else\n+ * thread higher than this thread is ahead of unlock_thread\n+ * thread must be lower then unlock thread\n+ */\n+ if (thread->k0_lock_state == HEX_LOCK_WAITING) {\n+ if (!unlock_thread) {\n+ unlock_thread = thread;\n+ } else if (unlock_thread->threadId > this_threadId) {\n+ if (this_threadId < thread->threadId &&\n+ thread->threadId < unlock_thread->threadId) {\n+ unlock_thread = thread;\n+ }\n+ } else {\n+ if (thread->threadId > this_threadId) {\n+ unlock_thread = thread;\n+ }\n+ if (thread->threadId < unlock_thread->threadId) {\n+ unlock_thread = thread;\n+ }\n+ }\n+ }\n+ }\n+ if (unlock_thread) {\n+ cs = env_cpu(unlock_thread);\n+ unlock_thread->k0_lock_state = HEX_LOCK_QUEUED;\n+ SET_SYSCFG_FIELD(unlock_thread, SYSCFG_K0LOCK, 1);\n+ cpu_interrupt(cs, CPU_INTERRUPT_K0_UNLOCK);\n+ }\n+\n+}\n #endif\n \n \n", "prefixes": [ "v4", "24/28" ] }