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Received: from foss.arm.com ([217.140.101.70]) by casper.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux)) id 1e0SiV-0007Go-Eh for linux-arm-kernel@lists.infradead.org; Fri, 06 Oct 2017 13:31:06 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 02C4515A2; Fri, 6 Oct 2017 06:30:46 -0700 (PDT) Received: from e106794-lin.cambridge.arm.com (e106794-lin.cambridge.arm.com [10.1.211.72]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 29D193F578; Fri, 6 Oct 2017 06:30:41 -0700 (PDT) From: Jean-Philippe Brucker To: linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, iommu@lists.linux-foundation.org Subject: [RFCv2 PATCH 34/36] PCI: Make "PRG Response PASID Required" handling common Date: Fri, 6 Oct 2017 14:32:01 +0100 Message-Id: <20171006133203.22803-35-jean-philippe.brucker@arm.com> X-Mailer: git-send-email 2.13.3 In-Reply-To: <20171006133203.22803-1-jean-philippe.brucker@arm.com> References: <20171006133203.22803-1-jean-philippe.brucker@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20171006_143103_782394_FC6B8044 X-CRM114-Status: GOOD ( 14.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, xieyisheng1@huawei.com, gabriele.paoloni@huawei.com, catalin.marinas@arm.com, will.deacon@arm.com, okaya@codeaurora.org, yi.l.liu@intel.com, lorenzo.pieralisi@arm.com, ashok.raj@intel.com, tn@semihalf.com, joro@8bytes.org, rfranz@cavium.com, lenb@kernel.org, jacob.jun.pan@linux.intel.com, alex.williamson@redhat.com, robh+dt@kernel.org, thunder.leizhen@huawei.com, bhelgaas@google.com, dwmw2@infradead.org, liubo95@huawei.com, rjw@rjwysocki.net, robdclark@gmail.com, hanjun.guo@linaro.org, sudeep.holla@arm.com, robin.murphy@arm.com, nwatters@codeaurora.org MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The PASID ECN to the PCIe spec added a bit in the PRI status register that allows a Function to declare whether a PRG Response should contain the PASID prefix or not. Move the helper that accesses it from amd_iommu into the PCI subsystem, renaming it to be consistent with the current spec (PRPR - PRG Response PASID Required). Signed-off-by: Jean-Philippe Brucker Acked-by: Bjorn Helgaas --- drivers/iommu/amd_iommu.c | 19 +------------------ drivers/pci/ats.c | 17 +++++++++++++++++ include/linux/pci-ats.h | 8 ++++++++ include/uapi/linux/pci_regs.h | 1 + 4 files changed, 27 insertions(+), 18 deletions(-) diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 51f8215877f5..45036a253d63 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -2039,23 +2039,6 @@ static int pdev_iommuv2_enable(struct pci_dev *pdev) return ret; } -/* FIXME: Move this to PCI code */ -#define PCI_PRI_TLP_OFF (1 << 15) - -static bool pci_pri_tlp_required(struct pci_dev *pdev) -{ - u16 status; - int pos; - - pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); - if (!pos) - return false; - - pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status); - - return (status & PCI_PRI_TLP_OFF) ? true : false; -} - /* * If a device is not yet associated with a domain, this function * assigns it visible for the hardware @@ -2084,7 +2067,7 @@ static int attach_device(struct device *dev, dev_data->ats.enabled = true; dev_data->ats.qdep = pci_ats_queue_depth(pdev); - dev_data->pri_tlp = pci_pri_tlp_required(pdev); + dev_data->pri_tlp = pci_prg_resp_requires_prefix(pdev); } } else if (amd_iommu_iotlb_sup && pci_enable_ats(pdev, PAGE_SHIFT) == 0) { diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c index ad8ddbbbf245..f95e42df728b 100644 --- a/drivers/pci/ats.c +++ b/drivers/pci/ats.c @@ -389,3 +389,20 @@ int pci_max_pasids(struct pci_dev *pdev) } EXPORT_SYMBOL_GPL(pci_max_pasids); #endif /* CONFIG_PCI_PASID */ + +#if defined(CONFIG_PCI_PASID) && defined(CONFIG_PCI_PRI) +bool pci_prg_resp_requires_prefix(struct pci_dev *pdev) +{ + u16 status; + int pos; + + pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI); + if (!pos) + return false; + + pci_read_config_word(pdev, pos + PCI_PRI_STATUS, &status); + + return !!(status & PCI_PRI_STATUS_PRPR); +} +EXPORT_SYMBOL_GPL(pci_prg_resp_requires_prefix); +#endif /* CONFIG_PCI_PASID && CONFIG_PCI_PRI */ diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h index 782fb8e0755f..367ea9448441 100644 --- a/include/linux/pci-ats.h +++ b/include/linux/pci-ats.h @@ -67,5 +67,13 @@ static inline int pci_max_pasids(struct pci_dev *pdev) #endif /* CONFIG_PCI_PASID */ +#if defined(CONFIG_PCI_PASID) && defined(CONFIG_PCI_PRI) +bool pci_prg_resp_requires_prefix(struct pci_dev *pdev); +#else +static inline bool pci_prg_resp_requires_prefix(struct pci_dev *pdev) +{ + return false; +} +#endif /* CONFIG_PCI_PASID && CONFIG_PCI_PRI */ #endif /* LINUX_PCI_ATS_H*/ diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index f8d58045926f..a0eeb16a2bfe 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -862,6 +862,7 @@ #define PCI_PRI_STATUS_RF 0x001 /* Response Failure */ #define PCI_PRI_STATUS_UPRGI 0x002 /* Unexpected PRG index */ #define PCI_PRI_STATUS_STOPPED 0x100 /* PRI Stopped */ +#define PCI_PRI_STATUS_PRPR 0x8000 /* PRG Response requires PASID prefix */ #define PCI_PRI_MAX_REQ 0x08 /* PRI max reqs supported */ #define PCI_PRI_ALLOC_REQ 0x0c /* PRI max reqs allowed */ #define PCI_EXT_CAP_PRI_SIZEOF 16