From nobody Sat Nov 30 01:35:55 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=none dis=none) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; t=1618336761; cv=none; d=zohomail.com; s=zohoarc; b=Dy7wpX5Z0g3fHRYgUdEXDzfWh0b33BI2wHPBASigmgXVvf8dvcKicOfUfCzhwLLNWh7rv6aDWWg13e73xs5DHP7Mc4yOTwE/Ld12lOLHsvaEYYvFL7Ksdi9X/VFMhqReenIJPHw7f8p0KdYRHmsX2CWaqEVCbKKnGSEasJVk2hM= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1618336761; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To; bh=bALCqDM5jWNLdUI+ifhEOykDaEu+7fqXUNFRaJFSbmY=; b=j5fkqAN4leyaqRWR+LFse0GYZ/jYwiGadLRKSrWZGVDkcSF83FxnxsPKvLmb2tlBqfm8ms7WoUB2BWV9clPZe3LSTty1cu1yCah5jijHf7dDOtuHeYruciIHtZ4ROQTESj52kGSIW/0DmSBzW9y3Y5p3Y/045ucZeuBDaFqhgI4= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1618336761707917.9621203311999; Tue, 13 Apr 2021 10:59:21 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.110065.210090 (Exim 4.92) (envelope-from ) id 1lWNJe-0005nf-4o; Tue, 13 Apr 2021 17:59:10 +0000 Received: by outflank-mailman (output) from mailman id 110065.210090; Tue, 13 Apr 2021 17:59:10 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lWNJe-0005nW-1O; Tue, 13 Apr 2021 17:59:10 +0000 Received: by outflank-mailman (input) for mailman id 110065; Tue, 13 Apr 2021 17:59:08 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1lWNJc-0005mq-Nd for xen-devel@lists.xenproject.org; Tue, 13 Apr 2021 17:59:08 +0000 Received: from mail.kernel.org (unknown [198.145.29.99]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id de480c82-f331-4900-b3f0-833cb310987d; Tue, 13 Apr 2021 17:59:08 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 190F16121E; Tue, 13 Apr 2021 17:59:07 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: de480c82-f331-4900-b3f0-833cb310987d DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618336747; bh=fb7TEhjeFBPmRBGB+oiw0ddGl1l0kr2WnMWhDttG8J4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=C0fhp2rd2+ve8G4cefVJHma9Kgsfz+xMVTXe3+zRLtUG3QSLOytK9Wi0ssdmewyhk AnJOoUDx4VroWtRAGkvglQr4ZLp63M48rWNVmYR1eYTXRbmv5skJS0sPstA33cokNS A2rnf2proLsu0CikX64mMoP1wjfpwQXpCIBKTSe/cS41UQVM4V9jsEJnl808XWn+nq KsYqeomJyEsNwM3sEuhDIRfNY3GC+SGg9CeU2IbVLim2gf3DFWoSt2XvQXjjWVrNFX shzNMxA183k/a4BT2rtY6/3fJA/blbFN/UEIanK+P4uxg7QwKCuiQ6xPdoastsqzPh I7+80opVVV2Rg== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, julien@xen.org, Bertrand.Marquis@arm.com, Volodymyr_Babchuk@epam.com, rahul.singh@arm.com, brian.woods@xilinx.com, Stefano Stabellini Subject: [PATCH RESEND v3 1/3] arm,smmu: switch to using iommu_fwspec functions Date: Tue, 13 Apr 2021 10:59:03 -0700 Message-Id: <20210413175905.15123-1-sstabellini@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: X-ZohoMail-DKIM: pass (identity @kernel.org) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Brian Woods Modify the smmu driver so that it uses the iommu_fwspec helper functions. This means both ARM IOMMU drivers will both use the iommu_fwspec helper functions, making enabling generic device tree bindings in the SMMU driver much cleaner. Signed-off-by: Brian Woods Signed-off-by: Stefano Stabellini Reviewed-by: Rahul Singh --- xen/drivers/passthrough/arm/smmu.c | 75 ++++++++++++++++++--------- xen/drivers/passthrough/device_tree.c | 7 +++ 2 files changed, 58 insertions(+), 24 deletions(-) diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/a= rm/smmu.c index 3456daa03f..ac75e23268 100644 --- a/xen/drivers/passthrough/arm/smmu.c +++ b/xen/drivers/passthrough/arm/smmu.c @@ -32,6 +32,9 @@ * - 4k and 64k pages, with contiguous pte hints. * - Up to 48-bit addressing (dependent on VA_BITS) * - Context fault reporting + * + * Changes compared to Linux driver: + * - support for fwspec */ =20 =20 @@ -49,6 +52,7 @@ #include #include #include +#include #include =20 /* Xen: The below defines are redefined within the file. Undef it */ @@ -615,13 +619,11 @@ struct arm_smmu_smr { =20 struct arm_smmu_master_cfg { struct arm_smmu_device *smmu; - int num_streamids; - u16 streamids[MAX_MASTER_STREAMIDS]; s16 smendx[MAX_MASTER_STREAMIDS]; }; #define INVALID_SMENDX -1 -#define for_each_cfg_sme(cfg, i, idx) \ - for (i =3D 0; idx =3D cfg->smendx[i], i < cfg->num_streamids; ++i) +#define for_each_cfg_sme(cfg, i, idx, num) \ + for (i =3D 0; idx =3D cfg->smendx[i], i < num; ++i) =20 struct arm_smmu_master { struct device_node *of_node; @@ -711,6 +713,14 @@ static struct arm_smmu_option_prop arm_smmu_options[] = =3D { { 0, NULL}, }; =20 +static inline struct iommu_fwspec * +arm_smmu_get_fwspec(struct arm_smmu_master_cfg *cfg) +{ + struct arm_smmu_master *master =3D container_of(cfg, + struct arm_smmu_master, cfg); + return dev_iommu_fwspec_get(&master->of_node->dev); +} + static void parse_driver_options(struct arm_smmu_device *smmu) { int i =3D 0; @@ -804,8 +814,9 @@ static int register_smmu_master(struct arm_smmu_device = *smmu, struct device *dev, struct of_phandle_args *masterspec) { - int i; + int i, ret =3D 0; struct arm_smmu_master *master; + struct iommu_fwspec *fwspec; =20 master =3D find_smmu_master(smmu, masterspec->np); if (master) { @@ -815,24 +826,29 @@ static int register_smmu_master(struct arm_smmu_devic= e *smmu, return -EBUSY; } =20 - if (masterspec->args_count > MAX_MASTER_STREAMIDS) { - dev_err(dev, - "reached maximum number (%d) of stream IDs for master device %s\n", - MAX_MASTER_STREAMIDS, masterspec->np->name); - return -ENOSPC; - } - master =3D devm_kzalloc(dev, sizeof(*master), GFP_KERNEL); if (!master) return -ENOMEM; + master->of_node =3D masterspec->np; =20 - master->of_node =3D masterspec->np; - master->cfg.num_streamids =3D masterspec->args_count; + ret =3D iommu_fwspec_init(&master->of_node->dev, smmu->dev); + if (ret) { + kfree(master); + return ret; + } + fwspec =3D dev_iommu_fwspec_get(dev); + + /* adding the ids here */ + ret =3D iommu_fwspec_add_ids(&masterspec->np->dev, + masterspec->args, + masterspec->args_count); + if (ret) + return ret; =20 /* Xen: Let Xen know that the device is protected by an SMMU */ dt_device_set_protected(masterspec->np); =20 - for (i =3D 0; i < master->cfg.num_streamids; ++i) { + for (i =3D 0; i < fwspec->num_ids; ++i) { u16 streamid =3D masterspec->args[i]; =20 if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH) && @@ -842,9 +858,9 @@ static int register_smmu_master(struct arm_smmu_device = *smmu, masterspec->np->name, smmu->num_mapping_groups); return -ERANGE; } - master->cfg.streamids[i] =3D streamid; master->cfg.smendx[i] =3D INVALID_SMENDX; } + return insert_smmu_master(smmu, master); } =20 @@ -1498,22 +1514,23 @@ static int arm_smmu_master_alloc_smes(struct device= *dev) struct arm_smmu_device *smmu =3D cfg->smmu; struct arm_smmu_smr *smrs =3D smmu->smrs; int i, idx, ret; + struct iommu_fwspec *fwspec =3D arm_smmu_get_fwspec(cfg); =20 spin_lock(&smmu->stream_map_lock); /* Figure out a viable stream map entry allocation */ - for_each_cfg_sme(cfg, i, idx) { + for_each_cfg_sme(cfg, i, idx, fwspec->num_ids) { if (idx !=3D INVALID_SMENDX) { ret =3D -EEXIST; goto out_err; } =20 - ret =3D arm_smmu_find_sme(smmu, cfg->streamids[i], 0); + ret =3D arm_smmu_find_sme(smmu, fwspec->ids[i], 0); if (ret < 0) goto out_err; =20 idx =3D ret; if (smrs && smmu->s2crs[idx].count =3D=3D 0) { - smrs[idx].id =3D cfg->streamids[i]; + smrs[idx].id =3D fwspec->ids[i]; smrs[idx].mask =3D 0; /* We don't currently share SMRs */ smrs[idx].valid =3D true; } @@ -1522,7 +1539,7 @@ static int arm_smmu_master_alloc_smes(struct device *= dev) } =20 /* It worked! Now, poke the actual hardware */ - for_each_cfg_sme(cfg, i, idx) { + for_each_cfg_sme(cfg, i, idx, fwspec->num_ids) { arm_smmu_write_sme(smmu, idx); } =20 @@ -1542,9 +1559,10 @@ static void arm_smmu_master_free_smes(struct arm_smm= u_master_cfg *cfg) { struct arm_smmu_device *smmu =3D cfg->smmu; int i, idx; + struct iommu_fwspec *fwspec =3D arm_smmu_get_fwspec(cfg); =20 spin_lock(&smmu->stream_map_lock); - for_each_cfg_sme(cfg, i, idx) { + for_each_cfg_sme(cfg, i, idx, fwspec->num_ids) { if (arm_smmu_free_sme(smmu, idx)) arm_smmu_write_sme(smmu, idx); cfg->smendx[i] =3D INVALID_SMENDX; @@ -1560,8 +1578,9 @@ static int arm_smmu_domain_add_master(struct arm_smmu= _domain *smmu_domain, enum arm_smmu_s2cr_type type =3D S2CR_TYPE_TRANS; u8 cbndx =3D smmu_domain->cfg.cbndx; int i, idx; + struct iommu_fwspec *fwspec =3D arm_smmu_get_fwspec(cfg); =20 - for_each_cfg_sme(cfg, i, idx) { + for_each_cfg_sme(cfg, i, idx, fwspec->num_ids) { if (type =3D=3D s2cr[idx].type && cbndx =3D=3D s2cr[idx].cbndx) continue; =20 @@ -1960,6 +1979,7 @@ static int arm_smmu_add_device(struct device *dev) struct arm_smmu_master_cfg *cfg; struct iommu_group *group; void (*releasefn)(void *) =3D NULL; + int ret; =20 smmu =3D find_smmu_for_device(dev); if (!smmu) @@ -1967,19 +1987,26 @@ static int arm_smmu_add_device(struct device *dev) =20 if (dev_is_pci(dev)) { struct pci_dev *pdev =3D to_pci_dev(dev); + struct iommu_fwspec *fwspec; =20 cfg =3D kzalloc(sizeof(*cfg), GFP_KERNEL); if (!cfg) { return -ENOMEM; } =20 - cfg->num_streamids =3D 1; + ret =3D iommu_fwspec_init(dev, smmu->dev); + if (ret) { + kfree(cfg); + return ret; + } + fwspec =3D dev_iommu_fwspec_get(dev); + /* * Assume Stream ID =3D=3D Requester ID for now. * We need a way to describe the ID mappings in FDT. */ pci_for_each_dma_alias(pdev, __arm_smmu_get_pci_sid, - &cfg->streamids[0]); + &fwspec->ids[0]); releasefn =3D __arm_smmu_release_pci_iommudata; cfg->smmu =3D smmu; } else { diff --git a/xen/drivers/passthrough/device_tree.c b/xen/drivers/passthroug= h/device_tree.c index 999b831d90..a51ae3c9c3 100644 --- a/xen/drivers/passthrough/device_tree.c +++ b/xen/drivers/passthrough/device_tree.c @@ -140,6 +140,13 @@ int iommu_add_dt_device(struct dt_device_node *np) if ( !ops ) return -EINVAL; =20 + /* + * This is needed in case a device has both the iommus property and + * also apperars in the mmu-masters list. + */ + if ( dt_device_is_protected(np) ) + return 0; + if ( dev_iommu_fwspec_get(dev) ) return -EEXIST; =20 --=20 2.17.1 From nobody Sat Nov 30 01:35:55 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org; dmarc=pass(p=none dis=none) header.from=kernel.org ARC-Seal: i=1; a=rsa-sha256; t=1618336765; cv=none; d=zohomail.com; s=zohoarc; b=EFdHKLUGM+jWaqQUm/YBNiiwlMAkuu5QwZBOc6IC/5/SvL6MAsSGBDarC6l7S+14zg8vvrJVV8WB/OVU44l1d7g4jud8R41xuPDMPfJwbdAU27SnSwkxFTO43zge+iKIjj4yOwQO+mlvoZmzSydz6JycHWl8LfoHyVaEGGlQ4lo= ARC-Message-Signature: i=1; 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a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618336748; bh=GPoJSocdsrvEwhHDE5FqQZWJ8Wf0LhPUhy+KObvq+MY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SJgdR9eqXI6OtzFJpsZ53jbb+ISgss34Mn6/Ysx84STntpdSsmX9C85F26xogi3N4 Z2Aq8HrqBntx+Z0OcTThf748vrJULUrplXvC2F5DYHGUDd0Dn8x3jLMHyJx6+tT3jR uy7VRuIJKyhM/FkVTIKfyxhOKIqWY6HjJseadtEQ9mVq3mSdhul+2CutYYIA6vTG4h IaTa6OfS10iYA+FmZvdJynd/9+aBdlXVg7YHQq0IeVr7zJ0zZaY1rs8uQbI99r7Aza 4JbTYvqD3WHB3Lq68bbRWqhFQR+eFPLu/PBOLlYpaJyvsMXCOB4n+ftGCj3f6wajQL 4xy2OWOQI/cTQ== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, julien@xen.org, Bertrand.Marquis@arm.com, Volodymyr_Babchuk@epam.com, rahul.singh@arm.com, brian.woods@xilinx.com, Stefano Stabellini Subject: [PATCH RESEND v3 2/3] arm,smmu: restructure code in preparation to new bindings support Date: Tue, 13 Apr 2021 10:59:04 -0700 Message-Id: <20210413175905.15123-2-sstabellini@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: X-ZohoMail-DKIM: pass (identity @kernel.org) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Brian Woods Restructure some of the code and add supporting functions for adding generic device tree (DT) binding support. This will allow for using current Linux device trees with just modifying the chosen field to enable Xen. Signed-off-by: Brian Woods Signed-off-by: Stefano Stabellini Reviewed-by: Rahul Singh Acked-by: Julien Grall --- xen/drivers/passthrough/arm/smmu.c | 62 +++++++++++++++++------------- 1 file changed, 35 insertions(+), 27 deletions(-) diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/a= rm/smmu.c index ac75e23268..f949c110ad 100644 --- a/xen/drivers/passthrough/arm/smmu.c +++ b/xen/drivers/passthrough/arm/smmu.c @@ -810,52 +810,36 @@ static int insert_smmu_master(struct arm_smmu_device = *smmu, return 0; } =20 -static int register_smmu_master(struct arm_smmu_device *smmu, - struct device *dev, - struct of_phandle_args *masterspec) +static int arm_smmu_dt_add_device_legacy(struct arm_smmu_device *smmu, + struct device *dev, + struct iommu_fwspec *fwspec) { - int i, ret =3D 0; + int i; struct arm_smmu_master *master; - struct iommu_fwspec *fwspec; + struct device_node *dev_node =3D dev_get_dev_node(dev); =20 - master =3D find_smmu_master(smmu, masterspec->np); + master =3D find_smmu_master(smmu, dev_node); if (master) { dev_err(dev, "rejecting multiple registrations for master device %s\n", - masterspec->np->name); + dev_node->name); return -EBUSY; } =20 master =3D devm_kzalloc(dev, sizeof(*master), GFP_KERNEL); if (!master) return -ENOMEM; - master->of_node =3D masterspec->np; - - ret =3D iommu_fwspec_init(&master->of_node->dev, smmu->dev); - if (ret) { - kfree(master); - return ret; - } - fwspec =3D dev_iommu_fwspec_get(dev); - - /* adding the ids here */ - ret =3D iommu_fwspec_add_ids(&masterspec->np->dev, - masterspec->args, - masterspec->args_count); - if (ret) - return ret; + master->of_node =3D dev_node; =20 /* Xen: Let Xen know that the device is protected by an SMMU */ - dt_device_set_protected(masterspec->np); + dt_device_set_protected(dev_node); =20 for (i =3D 0; i < fwspec->num_ids; ++i) { - u16 streamid =3D masterspec->args[i]; - if (!(smmu->features & ARM_SMMU_FEAT_STREAM_MATCH) && - (streamid >=3D smmu->num_mapping_groups)) { + (fwspec->ids[i] >=3D smmu->num_mapping_groups)) { dev_err(dev, "stream ID for master device %s greater than maximum allowed (%d)\n", - masterspec->np->name, smmu->num_mapping_groups); + dev_node->name, smmu->num_mapping_groups); return -ERANGE; } master->cfg.smendx[i] =3D INVALID_SMENDX; @@ -864,6 +848,30 @@ static int register_smmu_master(struct arm_smmu_device= *smmu, return insert_smmu_master(smmu, master); } =20 +static int register_smmu_master(struct arm_smmu_device *smmu, + struct device *dev, + struct of_phandle_args *masterspec) +{ + int ret =3D 0; + struct iommu_fwspec *fwspec; + + ret =3D iommu_fwspec_init(&masterspec->np->dev, smmu->dev); + if (ret) + return ret; + + fwspec =3D dev_iommu_fwspec_get(&masterspec->np->dev); + + ret =3D iommu_fwspec_add_ids(&masterspec->np->dev, + masterspec->args, + masterspec->args_count); + if (ret) + return ret; + + return arm_smmu_dt_add_device_legacy(smmu, + &masterspec->np->dev, + fwspec); +} + static struct arm_smmu_device *find_smmu_for_device(struct device *dev) { struct arm_smmu_device *smmu; --=20 2.17.1 From nobody Sat Nov 30 01:35:55 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; 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Tue, 13 Apr 2021 17:59:09 +0000 Received: from mail.kernel.org (unknown [198.145.29.99]) by us1-amaz-eas2.inumbo.com (Halon) with ESMTPS id 8f1b751f-e028-4178-953d-27769545bd62; Tue, 13 Apr 2021 17:59:09 +0000 (UTC) Received: by mail.kernel.org (Postfix) with ESMTPSA id 384F6613BD; Tue, 13 Apr 2021 17:59:08 +0000 (UTC) X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 8f1b751f-e028-4178-953d-27769545bd62 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618336748; bh=cF48fhXe8VDxHIjdbmagHQp6WnPcptB+p2Y6Sw661xQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rKoiWQR4KiJiUxVmFVzQnW5R89ABy843GDUxFHrAhEYtBrwqfAhkBOjC9rUZ7WRI+ nW6iPDU6d6/sQGAYukHjX+e239n3e2HStkLQuRzm7q2/Db8N1Z3cF7MkKAPAlMJed0 FpVFbmf0wpe3ZUKsqbMi24qeC6X+sBnr7zXXydkEcdogq49ZRqrv/RtunaLTz96fCd mc0CuwlqohYaiHW65D0lazUXffXp708VR75vShkOqZIVhREzgsebR27JY+LS2R6fPp i7+vv3/UgemCjPqOzude/GpNK+JVYqJpQU8v7+UykouILTMwJ/zhaajyu2ZQ+lh7dM KiurFg4KLhxZQ== From: Stefano Stabellini To: xen-devel@lists.xenproject.org Cc: sstabellini@kernel.org, julien@xen.org, Bertrand.Marquis@arm.com, Volodymyr_Babchuk@epam.com, rahul.singh@arm.com, brian.woods@xilinx.com, Stefano Stabellini Subject: [PATCH RESEND v3 3/3] arm,smmu: add support for generic DT bindings. Implement add_device and dt_xlate. Date: Tue, 13 Apr 2021 10:59:05 -0700 Message-Id: <20210413175905.15123-3-sstabellini@kernel.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: References: X-ZohoMail-DKIM: pass (identity @kernel.org) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Brian Woods Now that all arm iommu drivers support generic bindings we can remove the workaround from iommu_add_dt_device(). Note that if both legacy bindings and generic bindings are present in device tree, the legacy bindings are the ones that are used. Signed-off-by: Brian Woods Signed-off-by: Stefano Stabellini Reviewed-by: Rahul Singh --- xen/drivers/passthrough/arm/smmu.c | 42 ++++++++++++++++++++++++++- xen/drivers/passthrough/device_tree.c | 17 +---------- 2 files changed, 42 insertions(+), 17 deletions(-) diff --git a/xen/drivers/passthrough/arm/smmu.c b/xen/drivers/passthrough/a= rm/smmu.c index f949c110ad..b564851a56 100644 --- a/xen/drivers/passthrough/arm/smmu.c +++ b/xen/drivers/passthrough/arm/smmu.c @@ -254,6 +254,8 @@ struct iommu_group atomic_t ref; }; =20 +static struct arm_smmu_device *find_smmu(const struct device *dev); + static struct iommu_group *iommu_group_alloc(void) { struct iommu_group *group =3D xzalloc(struct iommu_group); @@ -442,6 +444,8 @@ static struct iommu_group *iommu_group_get(struct devic= e *dev) #define SMR_VALID (1U << 31) #define SMR_MASK_SHIFT 16 #define SMR_ID_SHIFT 0 +#define SMR_ID_MASK 0x7fff +#define SMR_MASK_MASK 0x7fff =20 #define ARM_SMMU_GR0_S2CR(n) (0xc00 + ((n) << 2)) #define S2CR_CBNDX_SHIFT 0 @@ -872,6 +876,40 @@ static int register_smmu_master(struct arm_smmu_device= *smmu, fwspec); } =20 +static int arm_smmu_dt_add_device_generic(u8 devfn, struct device *dev) +{ + struct arm_smmu_device *smmu; + struct iommu_fwspec *fwspec; + + fwspec =3D dev_iommu_fwspec_get(dev); + if (fwspec =3D=3D NULL) + return -ENXIO; + + smmu =3D find_smmu(fwspec->iommu_dev); + if (smmu =3D=3D NULL) + return -ENXIO; + + return arm_smmu_dt_add_device_legacy(smmu, dev, fwspec); +} + +static int arm_smmu_dt_xlate_generic(struct device *dev, + const struct dt_phandle_args *spec) +{ + uint32_t mask, fwid =3D 0; + + if (spec->args_count > 0) + fwid |=3D (SMR_ID_MASK & spec->args[0]) << SMR_ID_SHIFT; + + if (spec->args_count > 1) + fwid |=3D (SMR_MASK_MASK & spec->args[1]) << SMR_MASK_SHIFT; + else if (!of_property_read_u32(spec->np, "stream-match-mask", &mask)) + fwid |=3D (SMR_MASK_MASK & mask) << SMR_MASK_SHIFT; + + return iommu_fwspec_add_ids(dev, + &fwid, + 1); +} + static struct arm_smmu_device *find_smmu_for_device(struct device *dev) { struct arm_smmu_device *smmu; @@ -2836,6 +2874,7 @@ static void arm_smmu_iommu_domain_teardown(struct dom= ain *d) static const struct iommu_ops arm_smmu_iommu_ops =3D { .init =3D arm_smmu_iommu_domain_init, .hwdom_init =3D arm_smmu_iommu_hwdom_init, + .add_device =3D arm_smmu_dt_add_device_generic, .teardown =3D arm_smmu_iommu_domain_teardown, .iotlb_flush =3D arm_smmu_iotlb_flush, .iotlb_flush_all =3D arm_smmu_iotlb_flush_all, @@ -2843,9 +2882,10 @@ static const struct iommu_ops arm_smmu_iommu_ops =3D= { .reassign_device =3D arm_smmu_reassign_dev, .map_page =3D arm_iommu_map_page, .unmap_page =3D arm_iommu_unmap_page, + .dt_xlate =3D arm_smmu_dt_xlate_generic, }; =20 -static __init const struct arm_smmu_device *find_smmu(const struct device = *dev) +static struct arm_smmu_device *find_smmu(const struct device *dev) { struct arm_smmu_device *smmu; bool found =3D false; diff --git a/xen/drivers/passthrough/device_tree.c b/xen/drivers/passthroug= h/device_tree.c index a51ae3c9c3..ae07f272e1 100644 --- a/xen/drivers/passthrough/device_tree.c +++ b/xen/drivers/passthrough/device_tree.c @@ -162,22 +162,7 @@ int iommu_add_dt_device(struct dt_device_node *np) * these callback implemented. */ if ( !ops->add_device || !ops->dt_xlate ) - { - /* - * Some Device Trees may expose both legacy SMMU and generic - * IOMMU bindings together. However, the SMMU driver is only - * supporting the former and will protect them during the - * initialization. So we need to skip them and not return - * error here. - * - * XXX: This can be dropped when the SMMU is able to deal - * with generic bindings. - */ - if ( dt_device_is_protected(np) ) - return 0; - else - return -EINVAL; - } + return -EINVAL; =20 if ( !dt_device_is_available(iommu_spec.np) ) break; --=20 2.17.1