From nobody Wed Dec 17 10:07:13 2025 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 A315BCDB465 for ; Mon, 16 Oct 2023 17:21:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232967AbjJPRVB (ORCPT ); Mon, 16 Oct 2023 13:21:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34950 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233945AbjJPRU4 (ORCPT ); Mon, 16 Oct 2023 13:20:56 -0400 Received: from mail-pf1-x42f.google.com (mail-pf1-x42f.google.com [IPv6:2607:f8b0:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A20330DE for ; Mon, 16 Oct 2023 09:50:11 -0700 (PDT) Received: by mail-pf1-x42f.google.com with SMTP id d2e1a72fcca58-6b3c2607d9bso2337533b3a.1 for ; Mon, 16 Oct 2023 09:50:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1697475011; x=1698079811; darn=vger.kernel.org; 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=fGpfWXp12h96iIrhrZ9w/4qboCYb79h5kFDLjoFea9A=; b=TQEbZR5I3mwF8aFca89GAt1KoFSJF53udj3ReynViMjvp2q8ufWOGy0GN7Cic0tmkN FkqN1ONwbQuJLdOG0eTtttNh7I1WCiLRDHqUm31nqK12LOxH0mMwkOJIJUJulouAmgRE 9xDhUu0y5t5fkL9Ig6wqMVRktaPZUgu0F30UFAbgEHCRByEg/1Oc0oro+Vc7h5RkEuqi UD44Hp4YOyYgjbnHxB3CcH2ZkgiI2PzcGXitKOhBhfpuefPB2Rd/TakKdbXl9YV/qw41 Du5xujCVEwQROZfyOy0x5UOo0uY8JuUAbwonigxsONkPeBWiCbpEHseJcP4qUpFyvU4J TRcA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697475011; x=1698079811; 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=fGpfWXp12h96iIrhrZ9w/4qboCYb79h5kFDLjoFea9A=; b=Y1mDqkfxIf+q+Ay5fKlqcAuEB4897JEr5uyk0Bwi/i2FSeJeJvHqr+eE1JajMdPwRr wvW+VV3Sr1nlvLLG0hC4LTX4xLXMWEZMxTsqUw6D9vasXyoPn/V5/LfH1XR5uyMAHanb 8jczifmxIEaR6U3Di9sAWgL7kQeSrbiOd/c6woiA7c4zIiTP0pGs3cF/FRtDQDQBNVeB BWb+ffhVJnHRiAbAWujuMn3vxp+Xp2uUR32dTX0hyhRKNSIp115nBzp8eGDPwz15XLzw iMyLrDUMW/grp5Wg+ekr705EetAyhtm+MXLSxSBfqrReACnKY1dEAwYRxexXE7cLd6ue dL5g== X-Gm-Message-State: AOJu0Yxi2mnrXhg3gfr8hCJkkDZxF7qAW5AFavbu62w930HiMeRthT9m 17qF4DUH+PJWflDVcf0U6IJkog== X-Google-Smtp-Source: AGHT+IGjQ2ofm9vq+rM9KYxzcQbOI6U0lRLO3PtlSK9ezYbqJA021qj0LVOx7aeW/7sHzfS/fqtlUw== X-Received: by 2002:a05:6a00:1389:b0:6b2:6835:2a82 with SMTP id t9-20020a056a00138900b006b268352a82mr9317417pfg.13.1697475010850; Mon, 16 Oct 2023 09:50:10 -0700 (PDT) Received: from sunil-pc.Dlink ([106.51.188.78]) by smtp.gmail.com with ESMTPSA id t21-20020a056a0021d500b006b1e8f17b85sm111252pfj.201.2023.10.16.09.50.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 16 Oct 2023 09:50:10 -0700 (PDT) From: Sunil V L To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org Cc: Paul Walmsley , Palmer Dabbelt , Albert Ou , "Rafael J . Wysocki" , Len Brown , Andrew Jones , Conor Dooley , Anup Patel , Ard Biesheuvel , Atish Kumar Patra , Sunil V L , Alexandre Ghiti Subject: [PATCH v3 -next 1/3] RISC-V: ACPI: Enhance acpi_os_ioremap with MMIO remapping Date: Mon, 16 Oct 2023 22:19:56 +0530 Message-Id: <20231016164958.1191529-2-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231016164958.1191529-1-sunilvl@ventanamicro.com> References: <20231016164958.1191529-1-sunilvl@ventanamicro.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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. Signed-off-by: Sunil V L Reviewed-by: Andrew Jones Reviewed-by: Alexandre Ghiti Acked-by: Conor Dooley --- arch/riscv/Kconfig | 1 + arch/riscv/kernel/acpi.c | 87 +++++++++++++++++++++++++++++++++++++++- 2 files changed, 86 insertions(+), 2 deletions(-) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index d607ab0f7c6d..805c8ab7f23b 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -39,6 +39,7 @@ 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 if ACPI 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..e619edc8b0cc 100644 --- a/arch/riscv/kernel/acpi.c +++ b/arch/riscv/kernel/acpi.c @@ -14,9 +14,10 @@ */ =20 #include +#include #include +#include #include -#include =20 int acpi_noirq =3D 1; /* skip ACPI IRQ initialization */ int acpi_disabled =3D 1; @@ -217,7 +218,89 @@ void __init __acpi_unmap_table(void __iomem *map, unsi= gned long size) =20 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 =3D NULL; + pgprot_t prot; + + if (WARN_ON_ONCE(!efi_enabled(EFI_MEMMAP))) + return NULL; + + for_each_efi_memory_desc(md) { + u64 end =3D md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT); + + if (phys < md->phys_addr || phys >=3D end) + continue; + + if (phys + size > end) { + pr_warn(FW_BUG "requested region covers multiple EFI memory regions\n"); + return NULL; + } + region =3D 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 =3D 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\n"); + 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 =3D 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 =3D PAGE_KERNEL; + else if ((region->attribute & EFI_MEMORY_WC) || + (region->attribute & EFI_MEMORY_WT)) + prot =3D pgprot_writecombine(PAGE_KERNEL); + } + } + + return ioremap_prot(phys, size, pgprot_val(prot)); } =20 #ifdef CONFIG_PCI --=20 2.39.2