From patchwork Thu Aug 3 17:58:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sunil V L X-Patchwork-Id: 13340388 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EFC28EB64DD for ; Thu, 3 Aug 2023 18:00:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235295AbjHCSAf (ORCPT ); Thu, 3 Aug 2023 14:00:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235386AbjHCSAT (ORCPT ); Thu, 3 Aug 2023 14:00:19 -0400 Received: from mail-pf1-x432.google.com (mail-pf1-x432.google.com [IPv6:2607:f8b0:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5429B420C for ; Thu, 3 Aug 2023 11:00:05 -0700 (PDT) Received: by mail-pf1-x432.google.com with SMTP id d2e1a72fcca58-68706d67ed9so908795b3a.2 for ; Thu, 03 Aug 2023 11:00:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1691085605; x=1691690405; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Zrij3XCVzAcOqQorsC5sehKTr0CEJKtsrFsGaW9zZqM=; b=g6+YMcM4UaL1m62Ntt4qPvlZaEv/BYe4UX4PetuB3JttzYhNsA1GY4WTrRaVsePaTR atxJKkHV0OHfvFZ2y8Ln/HQAgi5oGOO9gAsr0K+aIIaY7ouzgXaONyhs/oUd71rdBMNZ LTqtCTDaFhTgMbf7aC8o2trc7JnD/nv6tEP80GHX3A+sLyfMvPmLcM1jG9CgM37CUAlF HA8ellFJwKVcSDXCbvFRMKk1KlpyWU7+fF8Ue932AzN1tptU0DxnNrPXXKi8jfk7+sRR EjceIniHqsZY3gcJMhRO2hVSYyvOldIln61vUNwnPp8vNEzk5ArDaGdXypxKcq0OKj54 7How== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691085605; x=1691690405; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Zrij3XCVzAcOqQorsC5sehKTr0CEJKtsrFsGaW9zZqM=; b=QwyU4FjUJfDkKr8FO5zioc2C22k4ojbiDa7uW7LZmdGJJ4aA6veEoesFt50xILnTct IL7pqaROHL/7+uBsHGa7oL1VT+NN81KuuYfqs6HQXD2P7/OcrmHFyEIbXGv18fNKfM4u OYCmY8NjziVfMFopOSzzUEdwIK8owtftkRd0LolrpEHgFoqdSVB2Ecf1S+G7dh30+MrY OIrgpLZiF3dThbgYbr6OXv1J6uPIiU3DlAfEPuv9Jbdfqqzut/Z53i9yxzGSj6UCPYoK QgN9NkIwmzfWceClH3ayfKM90k3CLHd/RdxAeuqFjfwMzpkxuCbDi8ytkfpMsbUOECBN U1Mw== X-Gm-Message-State: ABy/qLYdglGxFKBpidoTNaA71Br/tp98vHpSAsONLPgazyYOibGK33Ak CGV8v4s3gLDtzxX/fG1vGx9pKA== X-Google-Smtp-Source: APBJJlGfqnPnWK07EeosxE/Z01LsrLZM2OzMNSmgb3YDtRcKmZUzwJl9E9d4B2w1+YCc7DEVzsQZpA== X-Received: by 2002:aa7:8896:0:b0:687:4369:4ad2 with SMTP id z22-20020aa78896000000b0068743694ad2mr12618344pfe.33.1691085604789; Thu, 03 Aug 2023 11:00:04 -0700 (PDT) Received: from sunil-pc.Dlink ([106.51.190.143]) by smtp.gmail.com with ESMTPSA id s8-20020aa78d48000000b0065a1b05193asm134952pfe.185.2023.08.03.10.59.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 03 Aug 2023 11:00:04 -0700 (PDT) From: Sunil V L To: linux-doc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-acpi@vger.kernel.org, linux-pci@vger.kernel.org Cc: Jonathan Corbet , Paul Walmsley , Palmer Dabbelt , Albert Ou , Catalin Marinas , Will Deacon , "Rafael J . Wysocki" , Len Brown , Andy Shevchenko , Daniel Scally , Heikki Krogerus , Sakari Ailus , Greg Kroah-Hartman , Daniel Lezcano , Thomas Gleixner , Anup Patel , Marc Zyngier , Bjorn Helgaas , Robert Moore , Haibo Xu , Andrew Jones , Conor Dooley , Atish Kumar Patra , Sunil V L , Ard Biesheuvel , Alexandre Ghiti Subject: [RFC PATCH v1 04/21] RISC-V: ACPI: Enhance acpi_os_ioremap with MMIO remapping Date: Thu, 3 Aug 2023 23:28:59 +0530 Message-Id: <20230803175916.3174453-5-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230803175916.3174453-1-sunilvl@ventanamicro.com> References: <20230803175916.3174453-1-sunilvl@ventanamicro.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Enhance the acpi_os_ioremap() to support opregions in MMIO space. Also, have strict checks using EFI memory map to allow remapping the RAM similar to arm64. Cc: Ard Biesheuvel Cc: Alexandre Ghiti Signed-off-by: Sunil V L Reviewed-by: Andrew Jones --- arch/riscv/Kconfig | 1 + arch/riscv/kernel/acpi.c | 86 +++++++++++++++++++++++++++++++++++++++- 2 files changed, 86 insertions(+), 1 deletion(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 318f62a0a187..e19f32c12a68 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -38,6 +38,7 @@ config RISCV select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAS_VDSO_DATA + select ARCH_KEEP_MEMBLOCK select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX select ARCH_OPTIONAL_KERNEL_RWX_DEFAULT select ARCH_STACKWALK diff --git a/arch/riscv/kernel/acpi.c b/arch/riscv/kernel/acpi.c index 56cb2c986c48..aa4433bca6d9 100644 --- a/arch/riscv/kernel/acpi.c +++ b/arch/riscv/kernel/acpi.c @@ -17,6 +17,7 @@ #include #include #include +#include int acpi_noirq = 1; /* skip ACPI IRQ initialization */ int acpi_disabled = 1; @@ -217,7 +218,90 @@ void __init __acpi_unmap_table(void __iomem *map, unsigned long size) void __iomem *acpi_os_ioremap(acpi_physical_address phys, acpi_size size) { - return (void __iomem *)memremap(phys, size, MEMREMAP_WB); + efi_memory_desc_t *md, *region = NULL; + pgprot_t prot; + + if (WARN_ON_ONCE(!efi_enabled(EFI_MEMMAP))) + return NULL; + + for_each_efi_memory_desc(md) { + u64 end = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT); + + if (phys < md->phys_addr || phys >= end) + continue; + + if (phys + size > end) { + pr_warn(FW_BUG "requested region covers multiple EFI memory regions\n"); + return NULL; + } + region = md; + break; + } + + /* + * It is fine for AML to remap regions that are not represented in the + * EFI memory map at all, as it only describes normal memory, and MMIO + * regions that require a virtual mapping to make them accessible to + * the EFI runtime services. + */ + prot = PAGE_KERNEL_IO; + if (region) { + switch (region->type) { + case EFI_LOADER_CODE: + case EFI_LOADER_DATA: + case EFI_BOOT_SERVICES_CODE: + case EFI_BOOT_SERVICES_DATA: + case EFI_CONVENTIONAL_MEMORY: + case EFI_PERSISTENT_MEMORY: + if (memblock_is_map_memory(phys) || + !memblock_is_region_memory(phys, size)) { + pr_warn(FW_BUG "requested region covers kernel memory @ %p\n", + &phys); + return NULL; + } + + /* + * Mapping kernel memory is permitted if the region in + * question is covered by a single memblock with the + * NOMAP attribute set: this enables the use of ACPI + * table overrides passed via initramfs. + * This particular use case only requires read access. + */ + fallthrough; + + case EFI_RUNTIME_SERVICES_CODE: + /* + * This would be unusual, but not problematic per se, + * as long as we take care not to create a writable + * mapping for executable code. + */ + prot = PAGE_KERNEL_RO; + break; + + case EFI_ACPI_RECLAIM_MEMORY: + /* + * ACPI reclaim memory is used to pass firmware tables + * and other data that is intended for consumption by + * the OS only, which may decide it wants to reclaim + * that memory and use it for something else. We never + * do that, but we usually add it to the linear map + * anyway, in which case we should use the existing + * mapping. + */ + if (memblock_is_map_memory(phys)) + return (void __iomem *)__va(phys); + fallthrough; + + default: + if (region->attribute & EFI_MEMORY_WB) + prot = PAGE_KERNEL; + else if ((region->attribute & EFI_MEMORY_WC) || + (region->attribute & EFI_MEMORY_WT)) + prot = pgprot_writecombine(PAGE_KERNEL); + } + } + + return ioremap_prot(phys, size, pgprot_val(prot)); } #ifdef CONFIG_PCI