From nobody Fri May 3 20:05:35 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1491545457133477.35724425434705; Thu, 6 Apr 2017 23:10:57 -0700 (PDT) Received: from localhost ([::1]:49086 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cwN6l-0006tx-PT for importer@patchew.org; Fri, 07 Apr 2017 02:10:55 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35892) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cwN4w-0005eQ-Q3 for qemu-devel@nongnu.org; Fri, 07 Apr 2017 02:09:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cwN4r-0000y6-Q3 for qemu-devel@nongnu.org; Fri, 07 Apr 2017 02:09:02 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:33378) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cwN4r-0000xh-HP for qemu-devel@nongnu.org; Fri, 07 Apr 2017 02:08:57 -0400 Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v376408L081907 for ; Fri, 7 Apr 2017 02:08:56 -0400 Received: from e23smtp06.au.ibm.com (e23smtp06.au.ibm.com [202.81.31.148]) by mx0a-001b2d01.pphosted.com with ESMTP id 29p4qphkn7-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 07 Apr 2017 02:08:56 -0400 Received: from localhost by e23smtp06.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 7 Apr 2017 16:08:52 +1000 Received: from d23av06.au.ibm.com (d23av06.au.ibm.com [9.190.235.151]) by d23relay10.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v3768h8654067322; Fri, 7 Apr 2017 16:08:52 +1000 Received: from d23av06.au.ibm.com (localhost [127.0.0.1]) by d23av06.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v3768JQN005488; Fri, 7 Apr 2017 16:08:19 +1000 Received: from abhimanyu.ibmmodules.com ([9.199.56.119]) by d23av06.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id v3768D54005297; Fri, 7 Apr 2017 16:08:17 +1000 From: Nikunj A Dadhania To: qemu-ppc@nongnu.org, david@gibson.dropbear.id.au, rth@twiddle.net Date: Fri, 7 Apr 2017 11:37:50 +0530 X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170407060752.31313-1-nikunj@linux.vnet.ibm.com> References: <20170407060752.31313-1-nikunj@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 17040706-0040-0000-0000-000003053C24 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17040706-0041-0000-0000-00000C7C7DFA Message-Id: <20170407060752.31313-2-nikunj@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-04-07_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1704070055 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PATCH v2 1/3] target/ppc: Emulate LL/SC using cmpxchg helpers X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: programmingkidx@gmail.com, alex.bennee@linaro.org, qemu-devel@nongnu.org, nikunj@linux.vnet.ibm.com, bharata@linux.vnet.ibm.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Emulating LL/SC with cmpxchg is not correct, since it can suffer from the ABA problem. However, portable parallel code is written assuming only cmpxchg which means that in practice this is a viable alternative. Signed-off-by: Nikunj A Dadhania Reviewed-by: Richard Henderson --- target/ppc/translate.c | 29 +++++++++++++++++++++++------ 1 file changed, 23 insertions(+), 6 deletions(-) diff --git a/target/ppc/translate.c b/target/ppc/translate.c index f40b5a1..50b6d4d 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -73,6 +73,7 @@ static TCGv cpu_cfar; #endif static TCGv cpu_xer, cpu_so, cpu_ov, cpu_ca, cpu_ov32, cpu_ca32; static TCGv cpu_reserve; +static TCGv cpu_reserve_val; static TCGv cpu_fpscr; static TCGv_i32 cpu_access_type; =20 @@ -181,6 +182,9 @@ void ppc_translate_init(void) cpu_reserve =3D tcg_global_mem_new(cpu_env, offsetof(CPUPPCState, reserve_addr), "reserve_addr"); + cpu_reserve_val =3D tcg_global_mem_new(cpu_env, + offsetof(CPUPPCState, reserve_val), + "reserve_val"); =20 cpu_fpscr =3D tcg_global_mem_new(cpu_env, offsetof(CPUPPCState, fpscr), "fpscr"); @@ -3023,7 +3027,7 @@ static void gen_##name(DisasContext *ctx) = \ } \ tcg_gen_qemu_ld_tl(gpr, t0, ctx->mem_idx, memop); \ tcg_gen_mov_tl(cpu_reserve, t0); \ - tcg_gen_st_tl(gpr, cpu_env, offsetof(CPUPPCState, reserve_val)); \ + tcg_gen_mov_tl(cpu_reserve_val, gpr); \ tcg_temp_free(t0); \ } =20 @@ -3155,14 +3159,27 @@ static void gen_conditional_store(DisasContext *ctx= , TCGv EA, static void gen_conditional_store(DisasContext *ctx, TCGv EA, int reg, int memop) { - TCGLabel *l1; + TCGLabel *l1 =3D gen_new_label(); + TCGLabel *l2 =3D gen_new_label(); + TCGv t0; =20 - tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_so); - l1 =3D gen_new_label(); tcg_gen_brcond_tl(TCG_COND_NE, EA, cpu_reserve, l1); - tcg_gen_ori_i32(cpu_crf[0], cpu_crf[0], CRF_EQ); - tcg_gen_qemu_st_tl(cpu_gpr[reg], EA, ctx->mem_idx, memop); + + t0 =3D tcg_temp_new(); + tcg_gen_atomic_cmpxchg_tl(t0, cpu_reserve, cpu_reserve_val, + cpu_gpr[reg], ctx->mem_idx, + DEF_MEMOP(memop) | MO_ALIGN); + tcg_gen_setcond_tl(TCG_COND_EQ, t0, t0, cpu_reserve_val); + tcg_gen_shli_tl(t0, t0, CRF_EQ_BIT); + tcg_gen_or_tl(t0, t0, cpu_so); + tcg_gen_trunc_tl_i32(cpu_crf[0], t0); + tcg_temp_free(t0); + tcg_gen_br(l2); + gen_set_label(l1); + tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_so); + + gen_set_label(l2); tcg_gen_movi_tl(cpu_reserve, -1); } #endif --=20 2.9.3 From nobody Fri May 3 20:05:35 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1491545456385761.6305778031253; Thu, 6 Apr 2017 23:10:56 -0700 (PDT) Received: from localhost ([::1]:49085 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cwN6k-0006te-T6 for importer@patchew.org; Fri, 07 Apr 2017 02:10:54 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35891) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cwN4w-0005eR-Q4 for qemu-devel@nongnu.org; Fri, 07 Apr 2017 02:09:03 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cwN4u-0000zT-Fl for qemu-devel@nongnu.org; Fri, 07 Apr 2017 02:09:02 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:51591 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cwN4u-0000zD-9x for qemu-devel@nongnu.org; Fri, 07 Apr 2017 02:09:00 -0400 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v3763xdM016699 for ; Fri, 7 Apr 2017 02:08:59 -0400 Received: from e23smtp06.au.ibm.com (e23smtp06.au.ibm.com [202.81.31.148]) by mx0a-001b2d01.pphosted.com with ESMTP id 29p0sybyde-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 07 Apr 2017 02:08:59 -0400 Received: from localhost by e23smtp06.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 7 Apr 2017 16:08:55 +1000 Received: from d23av06.au.ibm.com (d23av06.au.ibm.com [9.190.235.151]) by d23relay09.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v3768kqI35258578; Fri, 7 Apr 2017 16:08:54 +1000 Received: from d23av06.au.ibm.com (localhost [127.0.0.1]) by d23av06.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v3768M6K005537; Fri, 7 Apr 2017 16:08:22 +1000 Received: from abhimanyu.ibmmodules.com ([9.199.56.119]) by d23av06.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id v3768D55005297; Fri, 7 Apr 2017 16:08:19 +1000 From: Nikunj A Dadhania To: qemu-ppc@nongnu.org, david@gibson.dropbear.id.au, rth@twiddle.net Date: Fri, 7 Apr 2017 11:37:51 +0530 X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170407060752.31313-1-nikunj@linux.vnet.ibm.com> References: <20170407060752.31313-1-nikunj@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 17040706-0040-0000-0000-000003053C26 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17040706-0041-0000-0000-00000C7C7DFC Message-Id: <20170407060752.31313-3-nikunj@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-04-07_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1704070055 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH v2 2/3] cputlb: handle first atomic write to the page X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: programmingkidx@gmail.com, alex.bennee@linaro.org, qemu-devel@nongnu.org, nikunj@linux.vnet.ibm.com, bharata@linux.vnet.ibm.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" In case where the conditional write is the first write to the page, TLB_NOTDIRTY will be set and stop_the_world is triggered. Handle this as a special case and set the dirty bit. After that fall through to the actual atomic instruction below. Signed-off-by: Nikunj A Dadhania Reviewed-by: Richard Henderson --- cputlb.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/cputlb.c b/cputlb.c index f5d056c..743776a 100644 --- a/cputlb.c +++ b/cputlb.c @@ -930,7 +930,13 @@ static void *atomic_mmu_lookup(CPUArchState *env, targ= et_ulong addr, tlb_addr =3D tlbe->addr_write; } =20 - /* Notice an IO access, or a notdirty page. */ + /* Check notdirty */ + if (unlikely(tlb_addr & TLB_NOTDIRTY)) { + tlb_set_dirty(ENV_GET_CPU(env), addr); + tlb_addr =3D tlb_addr & ~TLB_NOTDIRTY; + } + + /* Notice an IO access */ if (unlikely(tlb_addr & ~TARGET_PAGE_MASK)) { /* There's really nothing that can be done to support this apart from stop-the-world. */ --=20 2.9.3 From nobody Fri May 3 20:05:35 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1491545569336660.917551583019; Thu, 6 Apr 2017 23:12:49 -0700 (PDT) Received: from localhost ([::1]:49111 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cwN8a-0008Og-7M for importer@patchew.org; Fri, 07 Apr 2017 02:12:48 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35960) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cwN52-0005kQ-Ko for qemu-devel@nongnu.org; Fri, 07 Apr 2017 02:09:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cwN4y-00012W-5i for qemu-devel@nongnu.org; Fri, 07 Apr 2017 02:09:08 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:36434 helo=mx0a-001b2d01.pphosted.com) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cwN4y-00012A-0d for qemu-devel@nongnu.org; Fri, 07 Apr 2017 02:09:04 -0400 Received: from pps.filterd (m0098420.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.20/8.16.0.20) with SMTP id v3763sJE129995 for ; Fri, 7 Apr 2017 02:09:03 -0400 Received: from e23smtp03.au.ibm.com (e23smtp03.au.ibm.com [202.81.31.145]) by mx0b-001b2d01.pphosted.com with ESMTP id 29p3vekwqr-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Fri, 07 Apr 2017 02:09:02 -0400 Received: from localhost by e23smtp03.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; Fri, 7 Apr 2017 16:08:58 +1000 Received: from d23av06.au.ibm.com (d23av06.au.ibm.com [9.190.235.151]) by d23relay10.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id v3768nvv52887772; Fri, 7 Apr 2017 16:08:57 +1000 Received: from d23av06.au.ibm.com (localhost [127.0.0.1]) by d23av06.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id v3768P1T005568; Fri, 7 Apr 2017 16:08:25 +1000 Received: from abhimanyu.ibmmodules.com ([9.199.56.119]) by d23av06.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVin) with ESMTP id v3768D56005297; Fri, 7 Apr 2017 16:08:22 +1000 From: Nikunj A Dadhania To: qemu-ppc@nongnu.org, david@gibson.dropbear.id.au, rth@twiddle.net Date: Fri, 7 Apr 2017 11:37:52 +0530 X-Mailer: git-send-email 2.9.3 In-Reply-To: <20170407060752.31313-1-nikunj@linux.vnet.ibm.com> References: <20170407060752.31313-1-nikunj@linux.vnet.ibm.com> X-TM-AS-MML: disable x-cbid: 17040706-0008-0000-0000-0000011DFB55 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17040706-0009-0000-0000-0000094A42A4 Message-Id: <20170407060752.31313-4-nikunj@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2017-04-07_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=2 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1702020001 definitions=main-1704070055 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 Subject: [Qemu-devel] [PATCH v2 3/3] target/ppc: Generate fence operations X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: programmingkidx@gmail.com, alex.bennee@linaro.org, qemu-devel@nongnu.org, nikunj@linux.vnet.ibm.com, bharata@linux.vnet.ibm.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Nikunj A Dadhania Reviewed-by: Richard Henderson --- target/ppc/translate.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/target/ppc/translate.c b/target/ppc/translate.c index 50b6d4d..4a1f24a 100644 --- a/target/ppc/translate.c +++ b/target/ppc/translate.c @@ -2971,6 +2971,7 @@ static void gen_stswx(DisasContext *ctx) /* eieio */ static void gen_eieio(DisasContext *ctx) { + tcg_gen_mb(TCG_MO_LD_ST | TCG_BAR_SC); } =20 #if !defined(CONFIG_USER_ONLY) @@ -3008,6 +3009,7 @@ static void gen_isync(DisasContext *ctx) if (!ctx->pr) { gen_check_tlb_flush(ctx, false); } + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC); gen_stop_exception(ctx); } =20 @@ -3028,6 +3030,7 @@ static void gen_##name(DisasContext *ctx) = \ tcg_gen_qemu_ld_tl(gpr, t0, ctx->mem_idx, memop); \ tcg_gen_mov_tl(cpu_reserve, t0); \ tcg_gen_mov_tl(cpu_reserve_val, gpr); \ + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_LDAQ); \ tcg_temp_free(t0); \ } =20 @@ -3177,6 +3180,10 @@ static void gen_conditional_store(DisasContext *ctx,= TCGv EA, tcg_gen_br(l2); =20 gen_set_label(l1); + + /* Address mismatch implies failure. But we still need to provide the + memory barrier semantics of the instruction. */ + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_STRL); tcg_gen_trunc_tl_i32(cpu_crf[0], cpu_so); =20 gen_set_label(l2); @@ -3308,6 +3315,7 @@ static void gen_sync(DisasContext *ctx) if (((l =3D=3D 2) || !(ctx->insns_flags & PPC_64B)) && !ctx->pr) { gen_check_tlb_flush(ctx, true); } + tcg_gen_mb(TCG_MO_ALL | TCG_BAR_SC); } =20 /* wait */ --=20 2.9.3