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 D37AFFF886D for ; Tue, 28 Apr 2026 13:14:45 +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=DgHWXFeYzmIno08TLlWSw+H2JMyJHCyiCF9NgkGoC/M=; b=O1l6eet8qGkYXa HUVBSsQXXV6gBsmysdxbVFfcHTHzFXt+V48wtUetmFdpteTXaFtjCcxyjkmbVVZyf1JN4RC8TLUMy PH3Ky+IuGjV9OQalC0Olgabuljo+8WzvLj+7lJPFsxOUqui7c7gqwZlKFmP9azocRS0fOs5VD5QS8 PEahU308mw4QTFlG+GencTjuCWQrm9BU9h3pC0ok6eT/u3wBDsUh0KzYBAU0SYylsUTv5AvmPsT4m JHip41AfIzew/y8RuT2FPRIPjaBqt1USM3i9L2Q2qJuEVbOAyPEX92wM7KnQ/Pm544NB5fu4OJh7+ zYAfVqX/34sSdc33plJQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1wHiGs-00000001V9W-2M09; Tue, 28 Apr 2026 13:14:38 +0000 Received: from out30-111.freemail.mail.aliyun.com ([115.124.30.111]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1wHiGl-00000001Uzt-0GDB; Tue, 28 Apr 2026 13:14:32 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1777382068; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=iWNf/dxG28Z+J1fFtK1WtJe+wKDMG+JY4xphdsapE1c=; b=at4kJr/gBYzOVVeuRoz407TbkDwwVBV2fiZiigrz7noaSq9RGQcR3Y5+JMXXkr7nx+DzYY1vtX+Ky1aiBMcJIS5TkkOQseADiL5zWLqzmGcJVyXTOQUNwN7S65dqyodZ5W5oeDPd388NVc1Ok99uojg46dpD2qDGPaSBYAdGyKY= X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R481e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam011083073210;MF=fangyu.yu@linux.alibaba.com;NM=1;PH=DS;RN=24;SR=0;TI=SMTPD_---0X1ubIF3_1777382058; Received: from localhost.localdomain(mailfrom:fangyu.yu@linux.alibaba.com fp:SMTPD_---0X1ubIF3_1777382058 cluster:ay36) by smtp.aliyun-inc.com; Tue, 28 Apr 2026 21:14:19 +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, anup@brainfault.org, atish.patra@linux.dev, skhawaja@google.com, jgg@nvidia.com Cc: guoren@kernel.org, kvm@vger.kernel.org, iommu@lists.linux.dev, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, Zong Li , Fangyu Yu Subject: [RFC PATCH 04/11] iommu/riscv: support GSCID and GVMA invalidation command Date: Tue, 28 Apr 2026 21:13:52 +0800 Message-Id: <20260428131359.34872-5-fangyu.yu@linux.alibaba.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20260428131359.34872-1-fangyu.yu@linux.alibaba.com> References: <20260428131359.34872-1-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-20260428_061431_277781_11EBC424 X-CRM114-Status: GOOD ( 13.18 ) 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: Zong Li This patch adds a ID Allocator for GSCID and a wrap for setting up GSCID in IOTLB invalidation command. Set up iohgatp to enable second stage table and flush stage-2 table if the GSCID is set. The GSCID of domain should be freed when release domain. GSCID will be allocated for parent domain in nested IOMMU process. Signed-off-by: Zong Li Signed-off-by: Fangyu Yu --- drivers/iommu/riscv/iommu-bits.h | 7 +++++++ drivers/iommu/riscv/iommu.c | 32 ++++++++++++++++++++++++++------ 2 files changed, 33 insertions(+), 6 deletions(-) diff --git a/drivers/iommu/riscv/iommu-bits.h b/drivers/iommu/riscv/iommu-bits.h index 29a0040b1c32..7c440926fa23 100644 --- a/drivers/iommu/riscv/iommu-bits.h +++ b/drivers/iommu/riscv/iommu-bits.h @@ -716,6 +716,13 @@ static inline void riscv_iommu_cmd_inval_vma(struct riscv_iommu_command *cmd) cmd->dword1 = 0; } +static inline void riscv_iommu_cmd_inval_gvma(struct riscv_iommu_command *cmd) +{ + cmd->dword0 = FIELD_PREP(RISCV_IOMMU_CMD_OPCODE, RISCV_IOMMU_CMD_IOTINVAL_OPCODE) | + FIELD_PREP(RISCV_IOMMU_CMD_FUNC, RISCV_IOMMU_CMD_IOTINVAL_FUNC_GVMA); + cmd->dword1 = 0; +} + static inline void riscv_iommu_cmd_inval_set_addr(struct riscv_iommu_command *cmd, u64 addr) { diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c index 369c98b7e1e5..5dadf6d09139 100644 --- a/drivers/iommu/riscv/iommu.c +++ b/drivers/iommu/riscv/iommu.c @@ -48,6 +48,10 @@ static DEFINE_IDA(riscv_iommu_pscids); #define RISCV_IOMMU_MAX_PSCID (BIT(20) - 1) +/* IOMMU GSCID allocation namespace. */ +static DEFINE_IDA(riscv_iommu_gscids); +#define RISCV_IOMMU_MAX_GSCID (BIT(16) - 1) + /* Device resource-managed allocations */ struct riscv_iommu_devres { void *addr; @@ -819,6 +823,7 @@ struct riscv_iommu_domain { struct list_head bonds; spinlock_t lock; /* protect bonds list updates. */ int pscid; + int gscid; }; PT_IOMMU_CHECK_DOMAIN(struct riscv_iommu_domain, riscvpt.iommu, domain); @@ -967,15 +972,20 @@ static void riscv_iommu_iotlb_inval(struct riscv_iommu_domain *domain, /* * IOTLB invalidation request can be safely omitted if already sent - * to the IOMMU for the same PSCID, and with domain->bonds list + * to the IOMMU for the same PSCID/GSCID, and with domain->bonds list * arranged based on the device's IOMMU, it's sufficient to check * last device the invalidation was sent to. */ if (iommu == prev) continue; - riscv_iommu_cmd_inval_vma(&cmd); - riscv_iommu_cmd_inval_set_pscid(&cmd, domain->pscid); + if (domain->gscid) { + riscv_iommu_cmd_inval_gvma(&cmd); + riscv_iommu_cmd_inval_set_gscid(&cmd, domain->gscid); + } else { + riscv_iommu_cmd_inval_vma(&cmd); + riscv_iommu_cmd_inval_set_pscid(&cmd, domain->pscid); + } if (end - start < RISCV_IOMMU_IOTLB_INVAL_LIMIT - 1) { unsigned long iova = start; @@ -1120,6 +1130,7 @@ static void riscv_iommu_iodir_update(struct riscv_iommu_device *iommu, WRITE_ONCE(dc->fsc, new_dc->fsc); WRITE_ONCE(dc->ta, new_dc->ta & RISCV_IOMMU_PC_TA_PSCID); + WRITE_ONCE(dc->iohgatp, new_dc->iohgatp); /* Update device context, write TC.V as the last step. */ dma_wmb(); WRITE_ONCE(dc->tc, tc); @@ -1175,8 +1186,10 @@ static void riscv_iommu_free_paging_domain(struct iommu_domain *iommu_domain) WARN_ON(!list_empty(&domain->bonds)); - if ((int)domain->pscid > 0) + if (domain->pscid > 0) ida_free(&riscv_iommu_pscids, domain->pscid); + if (domain->gscid > 0) + ida_free(&riscv_iommu_gscids, domain->gscid); pt_iommu_deinit(&domain->riscvpt.iommu); kfree(domain); @@ -1212,8 +1225,15 @@ static int riscv_iommu_attach_paging_domain(struct iommu_domain *iommu_domain, if (!riscv_iommu_pt_supported(iommu, pt_info.fsc_iosatp_mode)) return -ENODEV; - dc.fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, pt_info.fsc_iosatp_mode) | - FIELD_PREP(RISCV_IOMMU_PC_FSC_PPN, pt_info.ppn); + if (domain->gscid) { + dc.iohgatp = FIELD_PREP(RISCV_IOMMU_DC_IOHGATP_MODE, pt_info.iohgatp_mode) | + FIELD_PREP(RISCV_IOMMU_DC_IOHGATP_GSCID, domain->gscid) | + FIELD_PREP(RISCV_IOMMU_DC_IOHGATP_PPN, pt_info.ppn); + } else { + dc.fsc = FIELD_PREP(RISCV_IOMMU_PC_FSC_MODE, pt_info.fsc_iosatp_mode) | + FIELD_PREP(RISCV_IOMMU_PC_FSC_PPN, pt_info.ppn); + } + dc.ta = FIELD_PREP(RISCV_IOMMU_PC_TA_PSCID, domain->pscid) | RISCV_IOMMU_PC_TA_V; -- 2.50.1 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv