From patchwork Mon Jan 25 05:15:51 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Gibson X-Patchwork-Id: 8103661 Return-Path: X-Original-To: patchwork-qemu-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id CB3949F6DA for ; Mon, 25 Jan 2016 05:15:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 0C1E2202BE for ; Mon, 25 Jan 2016 05:15:23 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3EA1920220 for ; Mon, 25 Jan 2016 05:15:22 +0000 (UTC) Received: from localhost ([::1]:34822 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aNZUn-0000p3-GE for patchwork-qemu-devel@patchwork.kernel.org; Mon, 25 Jan 2016 00:15:21 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56109) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aNZUU-0000iw-V3 for qemu-devel@nongnu.org; Mon, 25 Jan 2016 00:15:04 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aNZUT-0001I8-BM for qemu-devel@nongnu.org; Mon, 25 Jan 2016 00:15:02 -0500 Received: from ozlabs.org ([2401:3900:2:1::2]:34456) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aNZUS-0001HH-VU; Mon, 25 Jan 2016 00:15:01 -0500 Received: by ozlabs.org (Postfix, from userid 1007) id 1CD4F140A98; Mon, 25 Jan 2016 16:14:57 +1100 (AEDT) From: David Gibson To: benh@kernel.crashing.org Date: Mon, 25 Jan 2016 16:15:51 +1100 Message-Id: <1453698952-32092-10-git-send-email-david@gibson.dropbear.id.au> X-Mailer: git-send-email 2.5.0 In-Reply-To: <1453698952-32092-1-git-send-email-david@gibson.dropbear.id.au> References: <1453698952-32092-1-git-send-email-david@gibson.dropbear.id.au> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 2401:3900:2:1::2 Cc: lvivier@redhat.com, thuth@redhat.com, aik@ozlabs.ru, agraf@suse.de, qemu-devel@nongnu.org, qemu-ppc@nongnu.org, David Gibson Subject: [Qemu-devel] [PATCH 09/10] target-ppc: Helper to determine page size information from hpte alone X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP h_enter() in the spapr code needs to know the page size of the HPTE it's about to insert. Unlike other paths that do this, it doesn't have access to the SLB, so at the moment it determines this with some open-coded tests which assume POWER7 or POWER8 page size encodings. To make this more flexible add ppc_hash64_hpte_page_shift_noslb() to determine both the "base" page size per segment, and the individual effective page size from an HPTE alone. This means that the spapr code should now be able to handle any page size listed in the env->sps table. Signed-off-by: David Gibson --- hw/ppc/spapr_hcall.c | 25 ++++++------------------- target-ppc/mmu-hash64.c | 35 +++++++++++++++++++++++++++++++++++ target-ppc/mmu-hash64.h | 3 +++ 3 files changed, 44 insertions(+), 19 deletions(-) diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c index dedc7e0..a535c73 100644 --- a/hw/ppc/spapr_hcall.c +++ b/hw/ppc/spapr_hcall.c @@ -72,31 +72,18 @@ static target_ulong h_enter(PowerPCCPU *cpu, sPAPRMachineState *spapr, target_ulong pte_index = args[1]; target_ulong pteh = args[2]; target_ulong ptel = args[3]; - target_ulong page_shift = 12; + unsigned apshift, spshift; target_ulong raddr; target_ulong index; uint64_t token; - /* only handle 4k and 16M pages for now */ - if (pteh & HPTE64_V_LARGE) { -#if 0 /* We don't support 64k pages yet */ - if ((ptel & 0xf000) == 0x1000) { - /* 64k page */ - } else -#endif - if ((ptel & 0xff000) == 0) { - /* 16M page */ - page_shift = 24; - /* lowest AVA bit must be 0 for 16M pages */ - if (pteh & 0x80) { - return H_PARAMETER; - } - } else { - return H_PARAMETER; - } + apshift = ppc_hash64_hpte_page_shift_noslb(cpu, pteh, ptel, &spshift); + if (!apshift) { + /* Bad page size encoding */ + return H_PARAMETER; } - raddr = (ptel & HPTE64_R_RPN) & ~((1ULL << page_shift) - 1); + raddr = (ptel & HPTE64_R_RPN) & ~((1ULL << apshift) - 1); if (is_ram_address(spapr, raddr)) { /* Regular RAM - should have WIMG=0010 */ diff --git a/target-ppc/mmu-hash64.c b/target-ppc/mmu-hash64.c index 2be04e9..db57a63 100644 --- a/target-ppc/mmu-hash64.c +++ b/target-ppc/mmu-hash64.c @@ -512,6 +512,41 @@ static unsigned hpte_page_shift(const struct ppc_one_seg_page_size *sps, return 0; /* Bad page size encoding */ } +unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu, + uint64_t pte0, uint64_t pte1, + unsigned *seg_page_shift) +{ + CPUPPCState *env = &cpu->env; + int i; + + if (!(pte0 & HPTE64_V_LARGE)) { + *seg_page_shift = 12; + return 12; + } + + /* + * The encodings in env->sps need to be carefully chosen so that + * this gives an unambiguous result. + */ + for (i = 0; i < PPC_PAGE_SIZES_MAX_SZ; i++) { + const struct ppc_one_seg_page_size *sps = &env->sps.sps[i]; + unsigned shift; + + if (!sps->page_shift) { + break; + } + + shift = hpte_page_shift(sps, pte0, pte1); + if (shift) { + *seg_page_shift = sps->page_shift; + return shift; + } + } + + *seg_page_shift = 0; + return 0; +} + static hwaddr ppc_hash64_pte_raddr(unsigned page_shift, ppc_hash_pte64_t pte, target_ulong eaddr) { diff --git a/target-ppc/mmu-hash64.h b/target-ppc/mmu-hash64.h index 293a951..34cf975 100644 --- a/target-ppc/mmu-hash64.h +++ b/target-ppc/mmu-hash64.h @@ -16,6 +16,9 @@ void ppc_hash64_store_hpte(PowerPCCPU *cpu, target_ulong index, void ppc_hash64_tlb_flush_hpte(PowerPCCPU *cpu, target_ulong pte_index, target_ulong pte0, target_ulong pte1); +unsigned ppc_hash64_hpte_page_shift_noslb(PowerPCCPU *cpu, + uint64_t pte0, uint64_t pte1, + unsigned *seg_page_shift); #endif /*