From mboxrd@z Thu Jan 1 00:00:00 1970 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 phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C7D28CCD1A5 for ; Fri, 17 Oct 2025 13:17:40 +0000 (UTC) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id E99E4838AB; Fri, 17 Oct 2025 15:16:16 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=quarantine dis=none) header.from=ti.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Authentication-Results: phobos.denx.de; dkim=pass (1024-bit key; unprotected) header.d=ti.com header.i=@ti.com header.b="E8ZHXq7o"; dkim-atps=neutral Received: by phobos.denx.de (Postfix, from userid 109) id 97AED837E4; Fri, 17 Oct 2025 15:16:15 +0200 (CEST) Received: from lelvem-ot02.ext.ti.com (lelvem-ot02.ext.ti.com [198.47.23.235]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id D95ED838CE for ; Fri, 17 Oct 2025 15:16:12 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=pass (p=quarantine dis=none) header.from=ti.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=anshuld@ti.com Received: from lelvem-sh01.itg.ti.com ([10.180.77.71]) by lelvem-ot02.ext.ti.com (8.15.2/8.15.2) with ESMTP id 59HDFtBG2368706; Fri, 17 Oct 2025 08:15:55 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1760706955; bh=/nI2avJ1/J2gfPhns/vxfnIRBL1EBe+4qRn478aWoAg=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=E8ZHXq7oJ2CDC9D5WTrMf+Xz2l8Nms1iLnbBzmpddPwoKaff3Hxe1rl1OdXd1n35G zn+IbyNSNC9l/bi9puo8Z3Jf25H8kXDFXXSbMBNacDmaAEdZcooSxgPggXqDLXMPJ/ xkaBtpIMILwoZGARMp4DqE3gGV2VxpiQ7i6Ens/8= Received: from DLEE208.ent.ti.com (dlee208.ent.ti.com [157.170.170.97]) by lelvem-sh01.itg.ti.com (8.18.1/8.18.1) with ESMTPS id 59HDFtFc2419237 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 17 Oct 2025 08:15:55 -0500 Received: from DLEE204.ent.ti.com (157.170.170.84) by DLEE208.ent.ti.com (157.170.170.97) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Fri, 17 Oct 2025 08:15:55 -0500 Received: from lelvem-mr05.itg.ti.com (10.180.75.9) by DLEE204.ent.ti.com (157.170.170.84) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20 via Frontend Transport; Fri, 17 Oct 2025 08:15:55 -0500 Received: from localhost (dhcp-172-24-233-105.dhcp.ti.com [172.24.233.105]) by lelvem-mr05.itg.ti.com (8.18.1/8.18.1) with ESMTP id 59HDFsB31343086; Fri, 17 Oct 2025 08:15:55 -0500 From: Anshul Dalal To: CC: Anshul Dalal , , , , , , , , , , , , , , , , Subject: [PATCH v11 07/11] arm: armv8: mmu: add mmu_unmap_reserved_mem Date: Fri, 17 Oct 2025 18:45:29 +0530 Message-ID: <20251017131540.3636067-8-anshuld@ti.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251017131540.3636067-1-anshuld@ti.com> References: <20251017131540.3636067-1-anshuld@ti.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-C2ProcessedOrg: 333ef613-75bf-4e12-a4b1-8e3623f5dcea X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.39 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean For armv8, U-Boot uses a static map defined as 'mem_map' for configuring the MMU's page tables, done by mmu_setup. Though this works well for simpler platforms, it makes creating runtime carveouts by modifying the static array at runtime exceedingly complex like in mach-snapdragon/board.c. Creation of such carveouts are much better handled by APIs such as mmu_change_region_attr once the page tables are configured. Usually such carveouts are configured via the device-tree's reserved-memory node which provides the address and size for the carveout. Therefore this patch adds mmu_unmap_reserved_mem which acts as a wrapper over mmu_change_region_attr, helping unmap a reserved-memory region. Reviewed-by: Ilias Apalodimas Signed-off-by: Anshul Dalal Tested-by: Wadim Egorov --- arch/arm/cpu/armv8/cache_v8.c | 26 ++++++++++++++++++++++++++ arch/arm/include/asm/armv8/mmu.h | 9 +++++++++ 2 files changed, 35 insertions(+) diff --git a/arch/arm/cpu/armv8/cache_v8.c b/arch/arm/cpu/armv8/cache_v8.c index 9b3c37dae82..672ec16d483 100644 --- a/arch/arm/cpu/armv8/cache_v8.c +++ b/arch/arm/cpu/armv8/cache_v8.c @@ -86,6 +86,32 @@ int mem_map_from_dram_banks(unsigned int index, unsigned int len, u64 attrs) return 0; } + +int mmu_unmap_reserved_mem(const char *name, bool check_nomap) +{ + void *fdt = (void *)gd->fdt_blob; + char node_path[128]; + fdt_addr_t addr; + fdt_size_t size; + int ret; + + snprintf(node_path, sizeof(node_path), "/reserved-memory/%s", name); + ret = fdt_path_offset(fdt, node_path); + if (ret < 0) + return ret; + + if (check_nomap && !fdtdec_get_bool(fdt, ret, "no-map")) + return -EINVAL; + + addr = fdtdec_get_addr_size(fdt, ret, "reg", &size); + if (addr == FDT_ADDR_T_NONE) + return -1; + + mmu_change_region_attr_nobreak(addr, size, PTE_TYPE_FAULT); + + return 0; +} + u64 get_tcr(u64 *pips, u64 *pva_bits) { int el = get_effective_el(); diff --git a/arch/arm/include/asm/armv8/mmu.h b/arch/arm/include/asm/armv8/mmu.h index 6e7a3366844..8aa5f9721c4 100644 --- a/arch/arm/include/asm/armv8/mmu.h +++ b/arch/arm/include/asm/armv8/mmu.h @@ -207,6 +207,15 @@ void setup_pgtables(void); */ int mem_map_from_dram_banks(unsigned int index, unsigned int len, u64 attrs); +/** + * mmu_unmap_reserved_mem() - Unmaps a reserved-memory node as PTE_TYPE_FAULT + * once MMU is configured by mmu_setup. + * + * @name: The name of the node under "/reserved-memory/" path + * @check_nomap: Check if the node is marked "no-map" before unmapping it + */ +int mmu_unmap_reserved_mem(const char *name, bool check_nomap); + u64 get_tcr(u64 *pips, u64 *pva_bits); /** -- 2.51.0