From nobody Fri Feb 13 09:28:24 2026 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 6407FE82CB1 for ; Wed, 27 Sep 2023 17:00:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229566AbjI0RAf (ORCPT ); Wed, 27 Sep 2023 13:00:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52372 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229539AbjI0RAc (ORCPT ); Wed, 27 Sep 2023 13:00:32 -0400 Received: from mail-ua1-x92f.google.com (mail-ua1-x92f.google.com [IPv6:2607:f8b0:4864:20::92f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9FCB8DE for ; Wed, 27 Sep 2023 10:00:30 -0700 (PDT) Received: by mail-ua1-x92f.google.com with SMTP id a1e0cc1a2514c-7a803afa8c5so4210515241.0 for ; Wed, 27 Sep 2023 10:00:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ventanamicro.com; s=google; t=1695834029; x=1696438829; 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=+DmNFRxVXj8V3ocvjWMiRzGtl0URBCJyLqRyOWHwpdo=; b=niJ9TK3uHDTUJRdvlpKeb3J6E/u8VUuejYA4zVl6fdbZ14/GtVkfjfZrbqXKXPgKWB r0Zfh6MhJBIUv+FTFtqwUPjV2XK6J0vvFz0fPLtAHJTKRxSro5Bua7Yv4mRNq5x3pM84 8TQwCtPbaHHpQhyyCaUyjKWILwzvj2sKcH6dPBYpZhwgJQuvfKwmwXtduUviKNckhqfy jC9ic3wQF15av0ptoptrTRPaldBKvIN6sJp7BzCebmXqAy4wElQcWTNZh1c0ZFtpteoA vpNy1p86b/LOZX9b4ZTGc0ffr78SDR0LFuaW+v5fpl59sT/f4WU7kHHp4oPAiGB9I0xy wamQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1695834029; x=1696438829; 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=+DmNFRxVXj8V3ocvjWMiRzGtl0URBCJyLqRyOWHwpdo=; b=CzENp1vCtrtvXmqzcXVvCIpOc4kZDS/j8BXzFAs0pw5uMAP7nhRtxMK+q4vmvzRhI6 gTa/UyF8pCgCWrBnhPjJV3xdu3b7JqAXqI/uXoix40Qhjmpnf35QQ0mRAoyYbDaJoeap IQYfdjXuiFiPzVicJsKx6Hdx6DPdJlHXsRNMxDbzzuB3pjhC4Trb38JS7WGN8iX+IFMS a3DsNUUfVUCtqK6h8kff2bJNuoiCfm1+6G/UN3vRHuAddANVL6HoagdJFDcyWFntrhkb F44GBuDcGiC74ZsZSjXZD58ij1YcYyNaND2C/75GEJa9zjhl57XK0pSNF1DN5P8A+CEC /3Rg== X-Gm-Message-State: AOJu0Yywn0ty7muO4AEF08npjbyXmQOn6r2u9z9rvcZs5uQ1Y65r3TKR OauU8eTww8Ng9Sk+znlU6ODngQ== X-Google-Smtp-Source: AGHT+IGBgFPJjICylrMDS7JPEnRZuaEEh3Sec+u6/LbCPif/YPGepNKpytUBblydLbUQWx1xQGW8Jw== X-Received: by 2002:a67:f98f:0:b0:452:81c4:3b56 with SMTP id b15-20020a67f98f000000b0045281c43b56mr2534411vsq.18.1695834028193; Wed, 27 Sep 2023 10:00:28 -0700 (PDT) Received: from sunil-pc.Dlink ([106.51.190.42]) by smtp.gmail.com with ESMTPSA id u7-20020a637907000000b00584b293d157sm3279396pgc.80.2023.09.27.10.00.23 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Sep 2023 10:00:27 -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 , Daniel Lezcano , Thomas Gleixner , Andrew Jones , Conor Dooley , Anup Patel , Ard Biesheuvel , Alexandre Ghiti , Andy Shevchenko , Atish Kumar Patra , Sunil V L Subject: [PATCH v2 -next 1/4] RISC-V: ACPI: Enhance acpi_os_ioremap with MMIO remapping Date: Wed, 27 Sep 2023 22:30:12 +0530 Message-Id: <20230927170015.295232-2-sunilvl@ventanamicro.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230927170015.295232-1-sunilvl@ventanamicro.com> References: <20230927170015.295232-1-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 Acked-by: Conor Dooley Reviewed-by: Alexandre Ghiti --- 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..ac039cf8af7a 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 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