From nobody Wed Feb 11 11:28:08 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C02E76045 for ; Tue, 21 May 2024 11:49:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716292165; cv=none; b=dkS7wBpl/vvB5l4gjYx48zbU9PAkguRYwYLMwucnhjsFkhQF3VP2/VSg5Npmy/7M3d8iH/AeiSm27Yi02blDMPsk1fQXkRM1OLIqco0sF8pkzDPUm6RjHDgVBYZb8LiJVklYti5bNY/JSSI8zrZSQffGFS7m4hKH726tKApIkM0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716292165; c=relaxed/simple; bh=UfTTCJAd6gAR/W/+kWuHX2+0dwTK25Vi11SpkX7YGOg=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=LpCPrrD9Mg7l5FjKa1yruJQPuHRmMtubSkXjjm5Unw6KlIIxueQ6FzUDleLcoQUFbbz2J5Osg+4eaStSodYUGBvOzk0JRxfzI/WC/4V0hBxOZcu6WYbU9fBC+GFdBW29k3RtIb01lyvdW9FOW2KcSkNKEkEc2lhn0kYOlZeSUcM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=rESFWlwt; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="rESFWlwt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E6F4EC2BD11; Tue, 21 May 2024 11:49:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1716292164; bh=UfTTCJAd6gAR/W/+kWuHX2+0dwTK25Vi11SpkX7YGOg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rESFWlwtcK7rvFv8Um9btQJZUwRB2RdO8MjvUB2BICQEPh/EbugiTsxumyL5292hX SaghKnmizBA/pp7A+Dtlq+qwqNSRixbwdlsADGbs6CIn15dyBN0k28FwBbMS8aiTPI Kp1INLM1FgGFhmvmSsgoX0Ju3Cx9yzirSxLHZ/7IJ7s8WGmxnG22tVNZm7926LBz6M m49b2985aSBi87GawTioSdpHQvEIGdWaOc7nHUaGWvtz6CXRNKEfKQBtE6tGfFo5qO sEpBR+MlOfCff/Ge6iR1CKDRfbGBh0FxjrF7lgu/xXIUY28Ntlxfpz6GDjZg2lyHDr N+eN0jCwq4bcw== From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= To: Alexandre Ghiti , Albert Ou , David Hildenbrand , Palmer Dabbelt , Paul Walmsley , linux-riscv@lists.infradead.org, Oscar Salvador Cc: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Andrew Bresticker , Chethan Seshadri , Lorenzo Stoakes , Santosh Mamila , Sivakumar Munnangi , Sunil V L , linux-kernel@vger.kernel.org, linux-mm@kvack.org, virtualization@lists.linux-foundation.org Subject: [PATCH v3 9/9] riscv: mm: Add support for ZONE_DEVICE Date: Tue, 21 May 2024 13:48:30 +0200 Message-Id: <20240521114830.841660-10-bjorn@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20240521114830.841660-1-bjorn@kernel.org> References: <20240521114830.841660-1-bjorn@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable From: Bj=C3=B6rn T=C3=B6pel ZONE_DEVICE pages need DEVMAP PTEs support to function (ARCH_HAS_PTE_DEVMAP). Claim another RSW (reserved for software) bit in the PTE for DEVMAP mark, add the corresponding helpers, and enable ARCH_HAS_PTE_DEVMAP for riscv64. Signed-off-by: Bj=C3=B6rn T=C3=B6pel Reviewed-by: Alexandre Ghiti --- arch/riscv/Kconfig | 1 + arch/riscv/include/asm/pgtable-64.h | 20 ++++++++++++++++++++ arch/riscv/include/asm/pgtable-bits.h | 1 + arch/riscv/include/asm/pgtable.h | 17 +++++++++++++++++ 4 files changed, 39 insertions(+) diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 2724dc2af29f..0b74698c63c7 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -36,6 +36,7 @@ config RISCV select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PMEM_API select ARCH_HAS_PREPARE_SYNC_CORE_CMD + select ARCH_HAS_PTE_DEVMAP if 64BIT && MMU select ARCH_HAS_PTE_SPECIAL select ARCH_HAS_SET_DIRECT_MAP if MMU select ARCH_HAS_SET_MEMORY if MMU diff --git a/arch/riscv/include/asm/pgtable-64.h b/arch/riscv/include/asm/p= gtable-64.h index 221a5c1ee287..c67a9bbfd010 100644 --- a/arch/riscv/include/asm/pgtable-64.h +++ b/arch/riscv/include/asm/pgtable-64.h @@ -400,4 +400,24 @@ static inline struct page *pgd_page(pgd_t pgd) #define p4d_offset p4d_offset p4d_t *p4d_offset(pgd_t *pgd, unsigned long address); =20 +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +static inline int pte_devmap(pte_t pte); +static inline pte_t pmd_pte(pmd_t pmd); + +static inline int pmd_devmap(pmd_t pmd) +{ + return pte_devmap(pmd_pte(pmd)); +} + +static inline int pud_devmap(pud_t pud) +{ + return 0; +} + +static inline int pgd_devmap(pgd_t pgd) +{ + return 0; +} +#endif + #endif /* _ASM_RISCV_PGTABLE_64_H */ diff --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm= /pgtable-bits.h index 179bd4afece4..a8f5205cea54 100644 --- a/arch/riscv/include/asm/pgtable-bits.h +++ b/arch/riscv/include/asm/pgtable-bits.h @@ -19,6 +19,7 @@ #define _PAGE_SOFT (3 << 8) /* Reserved for software */ =20 #define _PAGE_SPECIAL (1 << 8) /* RSW: 0x1 */ +#define _PAGE_DEVMAP (1 << 9) /* RSW, devmap */ #define _PAGE_TABLE _PAGE_PRESENT =20 /* diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgta= ble.h index 7933f493db71..02fadc276064 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -387,6 +387,13 @@ static inline int pte_special(pte_t pte) return pte_val(pte) & _PAGE_SPECIAL; } =20 +#ifdef CONFIG_ARCH_HAS_PTE_DEVMAP +static inline int pte_devmap(pte_t pte) +{ + return pte_val(pte) & _PAGE_DEVMAP; +} +#endif + /* static inline pte_t pte_rdprotect(pte_t pte) */ =20 static inline pte_t pte_wrprotect(pte_t pte) @@ -428,6 +435,11 @@ static inline pte_t pte_mkspecial(pte_t pte) return __pte(pte_val(pte) | _PAGE_SPECIAL); } =20 +static inline pte_t pte_mkdevmap(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_DEVMAP); +} + static inline pte_t pte_mkhuge(pte_t pte) { return pte; @@ -711,6 +723,11 @@ static inline pmd_t pmd_mkdirty(pmd_t pmd) return pte_pmd(pte_mkdirty(pmd_pte(pmd))); } =20 +static inline pmd_t pmd_mkdevmap(pmd_t pmd) +{ + return pte_pmd(pte_mkdevmap(pmd_pte(pmd))); +} + static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd) { --=20 2.40.1