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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 3C2C7F45A12 for ; Sat, 11 Apr 2026 02:23:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=9MrDwoPVtNYUr6Fb06ZE5VpSkWsmpIOVH772oSmrJVI=; b=sY7yNltek3MP0l vdWQ76KkrWFnIXxyw0YulYGC69sALAGl/rmLC0zEDHNTkkAEjr0MGR1Oco+oY76ElEApy77RT7UGX idsbMLuyjKq3ozqqLagjubN0Kw+u2/6ZLVRyrkHJKgiWq811jrbWfXBYqexkYTTMTtY92pi1G58CG O/f1lkzp0z5czk95K43OhJmLjxMHNHrReuKNVqLy9QThwzp1n7Y45+LSYD3gXSUyul04aLhfS0CCp mDI357TcylD8fLY68dWNaBqlebVEB/GZn5lePU0ULOHdTgoWElO2Aw7ycnUGUTBuIQsPzzovNBYH6 oelygnyg9v29rzjp5hVw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wBNzf-0000000D3Ah-2ZSy; Sat, 11 Apr 2026 02:22:43 +0000 Received: from out30-100.freemail.mail.aliyun.com ([115.124.30.100]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wBNzc-0000000D39A-0268; Sat, 11 Apr 2026 02:22:41 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1775874153; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=OH5/TUCPHpy8sy8haBbJAQ5yBUA8WaHxyR6Sehfd16w=; b=fd4cLX6eQo1Mu7wU3IhRBL6ce+V2vurHNT18xxk1VmUestbEbJSX98DKKwFrd81R1DBDGp6BVF8hd+QQUIaS+4v6zwvjtN9EFwaObwVpRUepfj2ZPyKW/mv/yYYGm4WEjuUqA4lIrTbbira5UJpAYsK30UQSoApivbHI9RguXq4= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R121e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033045133197;MF=fangyu.yu@linux.alibaba.com;NM=1;PH=DS;RN=18;SR=0;TI=SMTPD_---0X0miYSJ_1775874149; Received: from localhost.localdomain(mailfrom:fangyu.yu@linux.alibaba.com fp:SMTPD_---0X0miYSJ_1775874149 cluster:ay36) by smtp.aliyun-inc.com; Sat, 11 Apr 2026 10:22:30 +0800 From: fangyu.yu@linux.alibaba.com To: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, tjeznach@rivosinc.com, jgg@ziepe.ca, kevin.tian@intel.com, baolu.lu@linux.intel.com, vasant.hegde@amd.com Cc: guoren@kernel.org, iommu@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Fangyu Yu Subject: [PATCH 2/2] iommupt: Encode IOMMU_MMIO/IOMMU_CACHE via RISC-V Svpbmt bits Date: Sat, 11 Apr 2026 10:22:23 +0800 Message-Id: <20260411022223.91029-3-fangyu.yu@linux.alibaba.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20260411022223.91029-1-fangyu.yu@linux.alibaba.com> References: <20260411022223.91029-1-fangyu.yu@linux.alibaba.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260410_192240_424921_7D3D595E X-CRM114-Status: UNSURE ( 6.18 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org From: Fangyu Yu When the RISC-V IOMMU page table format support Svpbmt, PBMT provides a way to tag mappings with page-based memory types. Encode memory type via PBMT in RISC-V IOMMU PTEs: - IOMMU_MMIO -> PBMT=IO - !IOMMU_CACHE -> PBMT=NC - otherwise -> PBMT=Normal (PBMT=0) Clear the PBMT field before applying the selected encoding, and only touch PBMT when PT_FEAT_RISCV_SVPBMT is advertised. Signed-off-by: Fangyu Yu --- drivers/iommu/generic_pt/fmt/riscv.h | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/drivers/iommu/generic_pt/fmt/riscv.h b/drivers/iommu/generic_pt/fmt/riscv.h index a7fef6266a36..02051bb3c6e5 100644 --- a/drivers/iommu/generic_pt/fmt/riscv.h +++ b/drivers/iommu/generic_pt/fmt/riscv.h @@ -58,6 +58,8 @@ enum { RISCVPT_G = BIT(5), RISCVPT_A = BIT(6), RISCVPT_D = BIT(7), + RISCVPT_NC = BIT(61), + RISCVPT_IO = BIT(62), RISCVPT_RSW = GENMASK(9, 8), RISCVPT_PPN32 = GENMASK(31, 10), @@ -237,6 +239,13 @@ static inline int riscvpt_iommu_set_prot(struct pt_common *common, pte |= RISCVPT_R; if (!(iommu_prot & IOMMU_NOEXEC)) pte |= RISCVPT_X; + if (common->features & BIT(PT_FEAT_RISCV_SVPBMT)) { + pte &= ~RISCVPT_PBMT; + if (iommu_prot & IOMMU_MMIO) + pte |= RISCVPT_IO; + else if (!(iommu_prot & IOMMU_CACHE)) + pte |= RISCVPT_NC; + } /* Caller must specify a supported combination of flags */ if (unlikely((pte & (RISCVPT_X | RISCVPT_W | RISCVPT_R)) == 0)) -- 2.50.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv