From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shameerali Kolothum Thodi Subject: RE: [PATCH v11 1/3] ACPI/IORT: Add msi address regions reservation helper Date: Thu, 14 Dec 2017 12:17:50 +0000 Message-ID: <5FC3163CFD30C246ABAA99954A238FA838628CDD@FRAEML521-MBX.china.huawei.com> References: <20171213115830.61872-1-shameerali.kolothum.thodi@huawei.com> <20171213115830.61872-2-shameerali.kolothum.thodi@huawei.com> <20171214114759.GA27117@e107981-ln.cambridge.arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT Return-path: In-Reply-To: <20171214114759.GA27117@e107981-ln.cambridge.arm.com> Content-Language: en-US Sender: linux-acpi-owner@vger.kernel.org To: Lorenzo Pieralisi Cc: "robin.murphy@arm.com" , "marc.zyngier@arm.com" , "will.deacon@arm.com" , "joro@8bytes.org" , John Garry , "xuwei (O)" , "Guohanjun (Hanjun Guo)" , "iommu@lists.linux-foundation.org" , "linux-arm-kernel@lists.infradead.org" , "linux-acpi@vger.kernel.org" , "devicetree@vger.kernel.org" , Linuxarm List-Id: devicetree@vger.kernel.org Hi Lorenzo, > -----Original Message----- > From: Lorenzo Pieralisi [mailto:lorenzo.pieralisi@arm.com] > Sent: Thursday, December 14, 2017 11:48 AM > To: Shameerali Kolothum Thodi > Cc: robin.murphy@arm.com; marc.zyngier@arm.com; will.deacon@arm.com; > joro@8bytes.org; John Garry ; xuwei (O) > ; Guohanjun (Hanjun Guo) ; > iommu@lists.linux-foundation.org; linux-arm-kernel@lists.infradead.org; linux- > acpi@vger.kernel.org; devicetree@vger.kernel.org; Linuxarm > > Subject: Re: [PATCH v11 1/3] ACPI/IORT: Add msi address regions reservation > helper > > On Wed, Dec 13, 2017 at 11:58:28AM +0000, Shameer Kolothum wrote: > > On some platforms msi parent address regions have to be excluded from > > normal IOVA allocation in that they are detected and decoded in a HW > > specific way by system components and so they cannot be considered normal > > IOVA address space. > > > > Add a helper function that retrieves ITS address regions - the msi > > parent - through IORT device <-> ITS mappings and reserves it so that > > these regions will not be translated by IOMMU and will be excluded from > > IOVA allocations. The function checks for the smmu model number and > > only applies the msi reservation if the platform requires it. > > > > Signed-off-by: Shameer Kolothum > > --- > > drivers/acpi/arm64/iort.c | 112 > +++++++++++++++++++++++++++++++++++++-- > > drivers/irqchip/irq-gic-v3-its.c | 3 +- > > include/linux/acpi_iort.h | 7 ++- > > 3 files changed, 117 insertions(+), 5 deletions(-) > > You need this additional hunk to make it compile on !CONFIG_IOMMU_API: Oops..Sorry, missed that. If you are happy with the rest, I will make the below change and sent out the v12(hopefully final). Please let me know. Thanks, Shameer > > -- >8 -- > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > index 3e0ce652c3e8..e2f7bddf5522 100644 > --- a/drivers/acpi/arm64/iort.c > +++ b/drivers/acpi/arm64/iort.c > @@ -762,25 +762,6 @@ static int __maybe_unused __get_pci_rid(struct > pci_dev *pdev, u16 alias, > return 0; > } > > -static __maybe_unused struct acpi_iort_node *iort_get_msi_resv_iommu( > - struct device *dev) > -{ > - struct acpi_iort_node *iommu; > - struct iommu_fwspec *fwspec = dev->iommu_fwspec; > - > - iommu = iort_get_iort_node(fwspec->iommu_fwnode); > - > - if (iommu && (iommu->type == ACPI_IORT_NODE_SMMU_V3)) { > - struct acpi_iort_smmu_v3 *smmu; > - > - smmu = (struct acpi_iort_smmu_v3 *)iommu->node_data; > - if (smmu->model == > ACPI_IORT_SMMU_V3_HISILICON_HI161X) > - return iommu; > - } > - > - return NULL; > -} > - > static int arm_smmu_iort_xlate(struct device *dev, u32 streamid, > struct fwnode_handle *fwnode, > const struct iommu_ops *ops) > @@ -807,6 +788,24 @@ static inline bool iort_iommu_driver_enabled(u8 type) > } > > #ifdef CONFIG_IOMMU_API > +static struct acpi_iort_node *iort_get_msi_resv_iommu(struct device *dev) > +{ > + struct acpi_iort_node *iommu; > + struct iommu_fwspec *fwspec = dev->iommu_fwspec; > + > + iommu = iort_get_iort_node(fwspec->iommu_fwnode); > + > + if (iommu && (iommu->type == ACPI_IORT_NODE_SMMU_V3)) { > + struct acpi_iort_smmu_v3 *smmu; > + > + smmu = (struct acpi_iort_smmu_v3 *)iommu->node_data; > + if (smmu->model == > ACPI_IORT_SMMU_V3_HISILICON_HI161X) > + return iommu; > + } > + > + return NULL; > +} > + > static inline const struct iommu_ops *iort_fwspec_iommu_ops( > struct iommu_fwspec *fwspec) > {