From patchwork Wed Sep 4 10:00:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jan Kiszka X-Patchwork-Id: 13790321 Received: from mta-64-225.siemens.flowmailer.net (mta-64-225.siemens.flowmailer.net [185.136.64.225]) (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 135031547E0 for ; Wed, 4 Sep 2024 10:10:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.136.64.225 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725444639; cv=none; b=tuRnF4fA/zn+uH7rOZk8WGU+npta14sMAgrbh9GkIgleLd8w1djiciDOtaePQPs6fqulAVLQKStu7KP1VbWJU0hJsQLvWNu48LRnLkWYi/hzmpwTNl6oNboAJerWiLO77YRh3oP8CMYBivOvXv1XbTr3HCvUSL3f2V44WwnEINk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725444639; c=relaxed/simple; bh=ruXlYa2LFhYJ5y3GJeJvo8cnrcRFPe3pTkO5A1lOkZ0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=oV59Q3MHmUsvRCC6wyFzbo42nXjE0pAF8oI1Gh4E56E4tx6k+MBPvP0wUcBwhYE52Jt9SkTRqD9o7cr0IXqo51qcUkeTKDIccmmrQrMEh8T+l/1MVLpD1gdO1BgnDUL1LfTq7mHux6v9rupOwFpvoGAIY6jbj9pwqDn2l136D3I= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=siemens.com; spf=pass smtp.mailfrom=rts-flowmailer.siemens.com; dkim=pass (2048-bit key) header.d=siemens.com header.i=jan.kiszka@siemens.com header.b=dqP4zkN4; arc=none smtp.client-ip=185.136.64.225 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=siemens.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rts-flowmailer.siemens.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=siemens.com header.i=jan.kiszka@siemens.com header.b="dqP4zkN4" Received: by mta-64-225.siemens.flowmailer.net with ESMTPSA id 20240904100025df4afb2d45de6b0504 for ; Wed, 04 Sep 2024 12:00:26 +0200 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; s=fm1; d=siemens.com; i=jan.kiszka@siemens.com; h=Date:From:Subject:To:Message-ID:MIME-Version:Content-Type:Content-Transfer-Encoding:Cc:References:In-Reply-To; bh=nJ23+pLVcV1YLo+DOWiwMwlffZaSUayxfrEBlEY2X7Q=; b=dqP4zkN4JrdHhH1kfYOs+e10N+3AYUeKMvEA3j1QhsHEgLY1tK5Zq51hTq4oryFfG2VAr/ 1i0llKkvsIMNasRvZql/HSkV5Pt+mRuXfBz6/FnKC1BbY9zzibzfxP/EikCXSAIxGUzE+402 TTqlILAlwzYRgPfEl6mfL0IsMFQRh187H+MKMxEe+sp6Bvho2sQHnIxFcyoDJT2lAt8JRNb4 qohDJoHbVeMSEsPjQV4tDG3NCtA/I1bzGzxyjsuSlC46zqmq67qy8uKAa9bdXhcL5R2iR77E ssSxCsxDi4M0ip3Qsqb8qmsRtqUdEMlbLGzQ7Q/SijhV+iRiotXkENUg==; From: Jan Kiszka To: Nishanth Menon , Santosh Shilimkar , Vignesh Raghavendra , Tero Kristo , Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, Siddharth Vadapalli , Bao Cheng Su , Hua Qian Li , Diogo Ivo , Lorenzo Pieralisi , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , Bjorn Helgaas Subject: [PATCH v4 4/7] PCI: keystone: Add supported for PVU-based DMA isolation on AM654 Date: Wed, 4 Sep 2024 12:00:13 +0200 Message-ID: <361441d35d781b3c474b05921634bcae08d1a7b4.1725444016.git.jan.kiszka@siemens.com> In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Flowmailer-Platform: Siemens Feedback-ID: 519:519-294854:519-21489:flowmailer From: Jan Kiszka The AM654 lacks an IOMMU, thus does not support isolating DMA requests from untrusted PCI devices to selected memory regions this way. Use static PVU-based protection instead. For this, we use the availability of restricted-dma-pool memory regions as trigger and register those as valid DMA targets with the PVU. In addition, we need to enable the mapping of requester IDs to VirtIDs in the PCI RC. We only use a single VirtID so far, catching all devices. This may be extended later on. Signed-off-by: Jan Kiszka --- CC: Lorenzo Pieralisi CC: "Krzysztof Wilczyński" CC: Bjorn Helgaas CC: linux-pci@vger.kernel.org --- drivers/pci/controller/dwc/pci-keystone.c | 101 ++++++++++++++++++++++ 1 file changed, 101 insertions(+) diff --git a/drivers/pci/controller/dwc/pci-keystone.c b/drivers/pci/controller/dwc/pci-keystone.c index 2219b1a866fa..96b871656da4 100644 --- a/drivers/pci/controller/dwc/pci-keystone.c +++ b/drivers/pci/controller/dwc/pci-keystone.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -26,6 +27,7 @@ #include #include #include +#include #include "../../pci.h" #include "pcie-designware.h" @@ -111,6 +113,16 @@ #define PCI_DEVICE_ID_TI_AM654X 0xb00c +#define KS_PCI_VIRTID 0 + +#define PCIE_VMAP_xP_CTRL 0x0 +#define PCIE_VMAP_xP_REQID 0x4 +#define PCIE_VMAP_xP_VIRTID 0x8 + +#define PCIE_VMAP_xP_CTRL_EN BIT(0) + +#define PCIE_VMAP_xP_VIRTID_VID_MASK 0xfff + struct ks_pcie_of_data { enum dw_pcie_device_mode mode; const struct dw_pcie_host_ops *host_ops; @@ -1125,6 +1137,89 @@ static const struct of_device_id ks_pcie_of_match[] = { { }, }; +#ifdef CONFIG_TI_PVU +static const char *ks_vmap_res[] = {"vmap_lp", "vmap_hp"}; + +static int ks_init_restricted_dma(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct of_phandle_iterator it; + bool init_vmap = false; + struct resource phys; + struct resource *res; + void __iomem *base; + unsigned int n; + u32 val; + int err; + + of_for_each_phandle(&it, err, dev->of_node, "memory-region", + NULL, 0) { + if (!of_device_is_compatible(it.node, "restricted-dma-pool")) + continue; + + err = of_address_to_resource(it.node, 0, &phys); + if (err < 0) { + dev_err(dev, "failed to parse memory region %pOF: %d\n", + it.node, err); + continue; + } + + err = ti_pvu_create_region(KS_PCI_VIRTID, &phys); + if (err < 0) + return err; + + init_vmap = true; + } + + if (init_vmap) { + for (n = 0; n < ARRAY_SIZE(ks_vmap_res); n++) { + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + ks_vmap_res[n]); + base = devm_pci_remap_cfg_resource(dev, res); + if (IS_ERR(base)) + return PTR_ERR(base); + + writel(0, base + PCIE_VMAP_xP_REQID); + + val = readl(base + PCIE_VMAP_xP_VIRTID); + val &= ~PCIE_VMAP_xP_VIRTID_VID_MASK; + val |= KS_PCI_VIRTID; + writel(val, base + PCIE_VMAP_xP_VIRTID); + + val = readl(base + PCIE_VMAP_xP_CTRL); + val |= PCIE_VMAP_xP_CTRL_EN; + writel(val, base + PCIE_VMAP_xP_CTRL); + } + } + + return 0; +} + +static void ks_release_restricted_dma(struct platform_device *pdev) +{ + struct of_phandle_iterator it; + struct resource phys; + int err; + + of_for_each_phandle(&it, err, pdev->dev.of_node, "memory-region", + NULL, 0) { + if (of_device_is_compatible(it.node, "restricted-dma-pool") && + of_address_to_resource(it.node, 0, &phys) == 0) + ti_pvu_remove_region(KS_PCI_VIRTID, &phys); + + } +} +#else +static inline int ks_init_restricted_dma(struct platform_device *pdev) +{ + return 0; +} + +static inline void ks_release_restricted_dma(struct platform_device *pdev) +{ +} +#endif + static int ks_pcie_probe(struct platform_device *pdev) { const struct dw_pcie_host_ops *host_ops; @@ -1273,6 +1368,10 @@ static int ks_pcie_probe(struct platform_device *pdev) if (ret < 0) goto err_get_sync; + ret = ks_init_restricted_dma(pdev); + if (ret < 0) + goto err_get_sync; + switch (mode) { case DW_PCIE_RC_TYPE: if (!IS_ENABLED(CONFIG_PCI_KEYSTONE_HOST)) { @@ -1354,6 +1453,8 @@ static void ks_pcie_remove(struct platform_device *pdev) int num_lanes = ks_pcie->num_lanes; struct device *dev = &pdev->dev; + ks_release_restricted_dma(pdev); + pm_runtime_put(dev); pm_runtime_disable(dev); ks_pcie_disable_phy(ks_pcie);