From patchwork Sun May 12 23:28:16 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: BALATON Zoltan X-Patchwork-Id: 13662875 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 9110AC25B4F for ; Sun, 12 May 2024 23:29:13 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1s6Icm-0002AZ-Et; Sun, 12 May 2024 19:29:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1s6IcX-0001sr-Ey; Sun, 12 May 2024 19:28:45 -0400 Received: from zero.eik.bme.hu ([2001:738:2001:2001::2001]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1s6IcU-0000Pa-Qw; Sun, 12 May 2024 19:28:44 -0400 Received: from zero.eik.bme.hu (localhost [127.0.0.1]) by zero.eik.bme.hu (Postfix) with ESMTP id 89EBA4E6780; Mon, 13 May 2024 01:28:18 +0200 (CEST) X-Virus-Scanned: amavisd-new at eik.bme.hu Received: from zero.eik.bme.hu ([127.0.0.1]) by zero.eik.bme.hu (zero.eik.bme.hu [127.0.0.1]) (amavisd-new, port 10028) with ESMTP id m5vZubAdvzkc; Mon, 13 May 2024 01:28:16 +0200 (CEST) Received: by zero.eik.bme.hu (Postfix, from userid 432) id 9AC184E6782; Mon, 13 May 2024 01:28:16 +0200 (CEST) Message-Id: In-Reply-To: References: From: BALATON Zoltan Subject: [PATCH v7 42/61] target/ppc/mmu_common.c: Simplify ppc6xx_tlb_pte_check() MIME-Version: 1.0 To: qemu-devel@nongnu.org, qemu-ppc@nongnu.org Cc: Nicholas Piggin , Daniel Henrique Barboza Date: Mon, 13 May 2024 01:28:16 +0200 (CEST) Received-SPF: pass client-ip=2001:738:2001:2001::2001; envelope-from=balaton@eik.bme.hu; helo=zero.eik.bme.hu X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Invert conditions to avoid deep nested ifs and return early instead. Remove some obvious comments that don't add more clarity. Signed-off-by: BALATON Zoltan --- target/ppc/mmu_common.c | 44 ++++++++++++++++++----------------------- 1 file changed, 19 insertions(+), 25 deletions(-) diff --git a/target/ppc/mmu_common.c b/target/ppc/mmu_common.c index a035cefcad..564fcc7cfb 100644 --- a/target/ppc/mmu_common.c +++ b/target/ppc/mmu_common.c @@ -99,32 +99,26 @@ static int ppc6xx_tlb_pte_check(mmu_ctx_t *ctx, target_ulong pte0, MMUAccessType access_type) { /* Check validity and table match */ - if (pte_is_valid(pte0) && ((pte0 >> 6) & 1) == pteh) { - /* Check vsid & api */ - if ((pte0 & PTE_PTEM_MASK) == ctx->ptem) { - if (ctx->raddr != (hwaddr)-1ULL) { - /* all matches should have equal RPN, WIMG & PP */ - if ((ctx->raddr & PTE_CHECK_MASK) != (pte1 & PTE_CHECK_MASK)) { - qemu_log_mask(CPU_LOG_MMU, "Bad RPN/WIMG/PP\n"); - return -3; - } - } - /* Keep the matching PTE information */ - ctx->raddr = pte1; - ctx->prot = ppc_hash32_pp_prot(ctx->key, pte1 & HPTE32_R_PP, - ctx->nx); - if (check_prot_access_type(ctx->prot, access_type)) { - /* Access granted */ - qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n"); - return 0; - } else { - /* Access right violation */ - qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n"); - return -2; - } - } + if (!pte_is_valid(pte0) || ((pte0 >> 6) & 1) != pteh || + (pte0 & PTE_PTEM_MASK) != ctx->ptem) { + return -1; + } + /* all matches should have equal RPN, WIMG & PP */ + if (ctx->raddr != (hwaddr)-1ULL && + (ctx->raddr & PTE_CHECK_MASK) != (pte1 & PTE_CHECK_MASK)) { + qemu_log_mask(CPU_LOG_MMU, "Bad RPN/WIMG/PP\n"); + return -3; + } + /* Keep the matching PTE information */ + ctx->raddr = pte1; + ctx->prot = ppc_hash32_pp_prot(ctx->key, pte1 & HPTE32_R_PP, ctx->nx); + if (check_prot_access_type(ctx->prot, access_type)) { + qemu_log_mask(CPU_LOG_MMU, "PTE access granted !\n"); + return 0; + } else { + qemu_log_mask(CPU_LOG_MMU, "PTE access rejected\n"); + return -2; } - return -1; } /* Software driven TLB helpers */