From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-130.freemail.mail.aliyun.com (out30-130.freemail.mail.aliyun.com [115.124.30.130]) (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 C67313D5668; Wed, 3 Jun 2026 15:19:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.130 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780499943; cv=none; b=ZDCCZbEkLdM3I1enoSgp1KYXaw2yVGI/+HaE5FhBpsotzungdLK+xh0X1GswTcPkJtIb7TGgHPhkzxKbspF64PDT2ZwXbJLhhwITaiKlOgFcQSlI0vVpP/Z6stMcqNY82mtTv6n5l9FvoxQKRndylCQJBSxUEvCfU5HiyDNl79A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780499943; c=relaxed/simple; bh=2EdJu9Y79r7d2ODLF34AG41Oem5sN9CIFtU0LBA+VD4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=awOG2jAlfPHl5GQ56a3ptHojGD86XNGBumMyfmk2/8Z2GdX8jAIq05JRzGENjH25DxLwYTL++7OL8RwjcDKMb7HkuvOWHGm56mcIbhj72l7tw/R2N+hMt5S79Zg4YlYCnPGLWPMyr8+mpLm6JuoE6tlUiDEQzfxf/6MYqPeZlZE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=QQ+54Q9q; arc=none smtp.client-ip=115.124.30.130 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="QQ+54Q9q" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1780499937; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=dO5/NXjjcnDrdXukdKiHb5r/uOc5W1brW08Se5tUIbo=; b=QQ+54Q9qVoGp2AJhXPTSWsTs1Kcu8QRz8LvlT/al1+kydyrcHdNn5oM7oDb9J+m1xk+FCHQmx1dbVCzw/gKjLhfqqRYXFKLCIPU02tEtTyUlK6+EBLxDX8lpRkDR6dMVJWFvENZe4PPCBav2kUJqtIIUqt4cp582eIlMvhZ52sM= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R721e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam011083073210;MF=guanghuifeng@linux.alibaba.com;NM=1;PH=DS;RN=28;SR=0;TI=SMTPD_---0X47fR3v_1780499931; Received: from VM20241011-104.tbsite.net(mailfrom:guanghuifeng@linux.alibaba.com fp:SMTPD_---0X47fR3v_1780499931 cluster:ay36) by smtp.aliyun-inc.com; Wed, 03 Jun 2026 23:18:51 +0800 From: Guanghui Feng To: jgg@ziepe.ca Cc: adrian.larumbe@collabora.com, airlied@gmail.com, alex@shazbot.org, alikernel-developer@linux.alibaba.com, baolu.lu@linux.intel.com, boris.brezillon@collabora.com, dri-devel@lists.freedesktop.org, dwmw2@infradead.org, iommu@lists.linux.dev, joro@8bytes.org, kevin.tian@intel.com, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, liviu.dudau@arm.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, oliver.yang@linux.alibaba.com, robh@kernel.org, robin.murphy@arm.com, shiyu.zsq@linux.alibaba.com, steven.price@arm.com, suravee.suthikulpanit@amd.com, tzimmermann@suse.de, wei.guo.simon@linux.alibaba.com, will@kernel.org, xlpang@linux.alibaba.com Subject: [PATCH v3 13/32] iommu/fsl_pamu: implement iova_to_phys_length Date: Wed, 3 Jun 2026 23:17:45 +0800 Message-ID: <20260603151804.1963871-14-guanghuifeng@linux.alibaba.com> X-Mailer: git-send-email 2.43.7 In-Reply-To: <20260603151804.1963871-1-guanghuifeng@linux.alibaba.com> References: <20260602104637.1219810-1-guanghuifeng@linux.alibaba.com> <20260603151804.1963871-1-guanghuifeng@linux.alibaba.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement iova_to_phys_length for FSL PAMU IOMMU driver, returning the actual PTE mapping size. Signed-off-by: Guanghui Feng --- drivers/iommu/fsl_pamu_domain.c | 26 ++++++++++++++++++++++---- 1 file changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/fsl_pamu_domain.c b/drivers/iommu/fsl_pamu_domain.c index 9664ef9840d2..60abd497dc63 100644 --- a/drivers/iommu/fsl_pamu_domain.c +++ b/drivers/iommu/fsl_pamu_domain.c @@ -169,12 +169,30 @@ static void attach_device(struct fsl_dma_domain *dma_domain, int liodn, struct d spin_unlock_irqrestore(&device_domain_lock, flags); } -static phys_addr_t fsl_pamu_iova_to_phys(struct iommu_domain *domain, - dma_addr_t iova) +static phys_addr_t fsl_pamu_iova_to_phys_length(struct iommu_domain *domain, + dma_addr_t iova, + size_t *mapped_length) { + if (iova < domain->geometry.aperture_start || iova > domain->geometry.aperture_end) - return 0; + return PHYS_ADDR_MAX; + + /* + * PAMU configures exactly one Primary PAACE entry per LIODN with the + * Multi-Window (MW) bit cleared and ATM = PAACE_ATM_WINDOW_XLATE, + * WBAL/TWBAL = 0. That is, every LIODN is backed by a single hardware + * mapping window of fixed size (1ULL << 36, i.e. 64GB, see + * pamu_config_ppaace()) performing an identity translation. The driver + * does not split this window into SPAACE sub-windows, so the entire + * aperture is one PAACE "PTE" entry. Return that single entry's size + * as mapped_length, matching the iova_to_phys_length contract that + * mapped_length reports the full size of the mapping entry which + * covers iova (not the remaining bytes from iova to its end). + */ + if (mapped_length) + *mapped_length = 1ULL << 36; + return iova; } @@ -435,7 +453,7 @@ static const struct iommu_ops fsl_pamu_ops = { .device_group = fsl_pamu_device_group, .default_domain_ops = &(const struct iommu_domain_ops) { .attach_dev = fsl_pamu_attach_device, - .iova_to_phys = fsl_pamu_iova_to_phys, + .iova_to_phys_length = fsl_pamu_iova_to_phys_length, .free = fsl_pamu_domain_free, } }; -- 2.43.7