This call chain is using dev->iommu->fwspec to pass around the fwspec between the three parts (acpi_iommu_configure_id(), acpi_iommu_fwspec_init(), iommu_probe_device()).
However there is no locking around the accesses to dev->iommu, so this is all racy. Allocate a clean, local, fwspec at the start of acpi_iommu_configure_id(), pass it through all functions on the stack to fill it with data, and finally pass it into iommu_probe_device_fwspec() which will load it into dev->iommu under a lock. Acked-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com> Reviewed-by: Jerry Snitselaar <jsnit...@redhat.com> Reviewed-by: Moritz Fischer <m...@kernel.org> Signed-off-by: Jason Gunthorpe <j...@nvidia.com> --- drivers/acpi/arm64/iort.c | 42 +++++++++--------- drivers/acpi/scan.c | 89 ++++++++++++++++++--------------------- drivers/acpi/viot.c | 45 +++++++++++--------- drivers/iommu/iommu.c | 5 +-- include/acpi/acpi_bus.h | 8 ++-- include/linux/acpi_iort.h | 8 +++- include/linux/acpi_viot.h | 5 ++- include/linux/iommu.h | 2 + 8 files changed, 103 insertions(+), 101 deletions(-) diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 6496ff5a6ba20d..b08682282ee5a7 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -1218,10 +1218,9 @@ static bool iort_pci_rc_supports_ats(struct acpi_iort_node *node) return pci_rc->ats_attribute & ACPI_IORT_ATS_SUPPORTED; } -static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node, - u32 streamid) +static int iort_iommu_xlate(struct iommu_fwspec *fwspec, struct device *dev, + struct acpi_iort_node *node, u32 streamid) { - const struct iommu_ops *ops; struct fwnode_handle *iort_fwnode; if (!node) @@ -1239,17 +1238,14 @@ static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node, * in the kernel or not, defer the IOMMU configuration * or just abort it. */ - ops = iommu_ops_from_fwnode(iort_fwnode); - if (!ops) - return iort_iommu_driver_enabled(node->type) ? - -EPROBE_DEFER : -ENODEV; - - return acpi_iommu_fwspec_init(dev, streamid, iort_fwnode, ops); + return acpi_iommu_fwspec_init(fwspec, dev, streamid, iort_fwnode, + iort_iommu_driver_enabled(node->type)); } struct iort_pci_alias_info { struct device *dev; struct acpi_iort_node *node; + struct iommu_fwspec *fwspec; }; static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data) @@ -1260,7 +1256,7 @@ static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data) parent = iort_node_map_id(info->node, alias, &streamid, IORT_IOMMU_TYPE); - return iort_iommu_xlate(info->dev, parent, streamid); + return iort_iommu_xlate(info->fwspec, info->dev, parent, streamid); } static void iort_named_component_init(struct device *dev, @@ -1280,7 +1276,8 @@ static void iort_named_component_init(struct device *dev, dev_warn(dev, "Could not add device properties\n"); } -static int iort_nc_iommu_map(struct device *dev, struct acpi_iort_node *node) +static int iort_nc_iommu_map(struct iommu_fwspec *fwspec, struct device *dev, + struct acpi_iort_node *node) { struct acpi_iort_node *parent; int err = -ENODEV, i = 0; @@ -1293,13 +1290,13 @@ static int iort_nc_iommu_map(struct device *dev, struct acpi_iort_node *node) i++); if (parent) - err = iort_iommu_xlate(dev, parent, streamid); + err = iort_iommu_xlate(fwspec, dev, parent, streamid); } while (parent && !err); return err; } -static int iort_nc_iommu_map_id(struct device *dev, +static int iort_nc_iommu_map_id(struct iommu_fwspec *fwspec, struct device *dev, struct acpi_iort_node *node, const u32 *in_id) { @@ -1308,7 +1305,7 @@ static int iort_nc_iommu_map_id(struct device *dev, parent = iort_node_map_id(node, *in_id, &streamid, IORT_IOMMU_TYPE); if (parent) - return iort_iommu_xlate(dev, parent, streamid); + return iort_iommu_xlate(fwspec, dev, parent, streamid); return -ENODEV; } @@ -1317,20 +1314,22 @@ static int iort_nc_iommu_map_id(struct device *dev, /** * iort_iommu_configure_id - Set-up IOMMU configuration for a device. * + * @fwspec: The iommu_fwspec to fill in with fw information about the device * @dev: device to configure * @id_in: optional input id const value pointer * * Returns: 0 on success, <0 on failure */ -int iort_iommu_configure_id(struct device *dev, const u32 *id_in) +int iort_iommu_configure_id(struct iommu_fwspec *fwspec, struct device *dev, + const u32 *id_in) { struct acpi_iort_node *node; int err = -ENODEV; if (dev_is_pci(dev)) { - struct iommu_fwspec *fwspec; struct pci_bus *bus = to_pci_dev(dev)->bus; - struct iort_pci_alias_info info = { .dev = dev }; + struct iort_pci_alias_info info = { .dev = dev, + .fwspec = fwspec }; node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX, iort_match_node_callback, &bus->dev); @@ -1341,8 +1340,7 @@ int iort_iommu_configure_id(struct device *dev, const u32 *id_in) err = pci_for_each_dma_alias(to_pci_dev(dev), iort_pci_iommu_init, &info); - fwspec = dev_iommu_fwspec_get(dev); - if (fwspec && iort_pci_rc_supports_ats(node)) + if (iort_pci_rc_supports_ats(node)) fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS; } else { node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT, @@ -1350,8 +1348,8 @@ int iort_iommu_configure_id(struct device *dev, const u32 *id_in) if (!node) return -ENODEV; - err = id_in ? iort_nc_iommu_map_id(dev, node, id_in) : - iort_nc_iommu_map(dev, node); + err = id_in ? iort_nc_iommu_map_id(fwspec, dev, node, id_in) : + iort_nc_iommu_map(fwspec, dev, node); if (!err) iort_named_component_init(dev, node); @@ -1363,8 +1361,6 @@ int iort_iommu_configure_id(struct device *dev, const u32 *id_in) #else void iort_iommu_get_resv_regions(struct device *dev, struct list_head *head) { } -int iort_iommu_configure_id(struct device *dev, const u32 *input_id) -{ return -ENODEV; } #endif static int nc_dma_get_range(struct device *dev, u64 *size) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index d171d193f2a51c..5d467ff58ff24b 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -1543,74 +1543,67 @@ int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map) } #ifdef CONFIG_IOMMU_API -int acpi_iommu_fwspec_init(struct device *dev, u32 id, - struct fwnode_handle *fwnode, - const struct iommu_ops *ops) +int acpi_iommu_fwspec_init(struct iommu_fwspec *fwspec, struct device *dev, + u32 id, struct fwnode_handle *fwnode, + bool iommu_driver_available) { - int ret = iommu_fwspec_init(dev, fwnode, ops); + int ret; - if (!ret) - ret = iommu_fwspec_add_ids(dev, &id, 1); - - return ret; -} - -static inline const struct iommu_ops *acpi_iommu_fwspec_ops(struct device *dev) -{ - struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); - - return fwspec ? fwspec->ops : NULL; + ret = iommu_fwspec_assign_iommu(fwspec, dev, fwnode); + if (ret) { + if (ret == -EPROBE_DEFER && !iommu_driver_available) + return -ENODEV; + return ret; + } + return iommu_fwspec_append_ids(fwspec, &id, 1); } static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in) { int err; - const struct iommu_ops *ops; + struct iommu_fwspec *fwspec; - /* - * If we already translated the fwspec there is nothing left to do, - * return the iommu_ops. - */ - ops = acpi_iommu_fwspec_ops(dev); - if (ops) - return 0; + fwspec = iommu_fwspec_alloc(); + if (IS_ERR(fwspec)) + return PTR_ERR(fwspec); - err = iort_iommu_configure_id(dev, id_in); - if (err && err != -EPROBE_DEFER) - err = viot_iommu_configure(dev); + err = iort_iommu_configure_id(fwspec, dev, id_in); + if (err == -ENODEV) + err = viot_iommu_configure(fwspec, dev); + if (err == -ENODEV || err == -EPROBE_DEFER) + goto err_free; + if (err) + goto err_log; - /* - * If we have reason to believe the IOMMU driver missed the initial - * iommu_probe_device() call for dev, replay it to get things in order. - */ - if (!err && dev->bus) - err = iommu_probe_device(dev); - - /* Ignore all other errors apart from EPROBE_DEFER */ - if (err == -EPROBE_DEFER) { - return err; - } else if (err) { - dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); - return -ENODEV; + err = iommu_probe_device_fwspec(dev, fwspec); + if (err) { + /* + * Ownership for fwspec always passes into + * iommu_probe_device_fwspec() + */ + fwspec = NULL; + goto err_log; } - if (!acpi_iommu_fwspec_ops(dev)) - return -ENODEV; - return 0; + +err_log: + dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); +err_free: + iommu_fwspec_dealloc(fwspec); + return err; } #else /* !CONFIG_IOMMU_API */ -int acpi_iommu_fwspec_init(struct device *dev, u32 id, - struct fwnode_handle *fwnode, - const struct iommu_ops *ops) +int acpi_iommu_fwspec_init(struct iommu_fwspec *fwspec, struct device *dev, + u32 id, struct fwnode_handle *fwnode, + bool iommu_driver_available) { return -ENODEV; } -static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, - const u32 *id_in) +static int acpi_iommu_configure_id(struct device *dev, const u32 *id_in) { - return NULL; + return -ENODEV; } #endif /* !CONFIG_IOMMU_API */ diff --git a/drivers/acpi/viot.c b/drivers/acpi/viot.c index c8025921c129b2..1d0da99e65e6af 100644 --- a/drivers/acpi/viot.c +++ b/drivers/acpi/viot.c @@ -304,11 +304,9 @@ void __init acpi_viot_init(void) acpi_put_table(hdr); } -static int viot_dev_iommu_init(struct device *dev, struct viot_iommu *viommu, - u32 epid) +static int viot_dev_iommu_init(struct iommu_fwspec *fwspec, struct device *dev, + struct viot_iommu *viommu, u32 epid) { - const struct iommu_ops *ops; - if (!viommu) return -ENODEV; @@ -316,19 +314,20 @@ static int viot_dev_iommu_init(struct device *dev, struct viot_iommu *viommu, if (device_match_fwnode(dev, viommu->fwnode)) return -EINVAL; - ops = iommu_ops_from_fwnode(viommu->fwnode); - if (!ops) - return IS_ENABLED(CONFIG_VIRTIO_IOMMU) ? - -EPROBE_DEFER : -ENODEV; - - return acpi_iommu_fwspec_init(dev, epid, viommu->fwnode, ops); + return acpi_iommu_fwspec_init(fwspec, dev, epid, viommu->fwnode, + IS_ENABLED(CONFIG_VIRTIO_IOMMU)); } +struct viot_pci_alias_info { + struct device *dev; + struct iommu_fwspec *fwspec; +}; + static int viot_pci_dev_iommu_init(struct pci_dev *pdev, u16 dev_id, void *data) { u32 epid; struct viot_endpoint *ep; - struct device *aliased_dev = data; + struct viot_pci_alias_info *info = data; u32 domain_nr = pci_domain_nr(pdev->bus); list_for_each_entry(ep, &viot_pci_ranges, list) { @@ -339,14 +338,15 @@ static int viot_pci_dev_iommu_init(struct pci_dev *pdev, u16 dev_id, void *data) epid = ((domain_nr - ep->segment_start) << 16) + dev_id - ep->bdf_start + ep->endpoint_id; - return viot_dev_iommu_init(aliased_dev, ep->viommu, - epid); + return viot_dev_iommu_init(info->fwspec, info->dev, + ep->viommu, epid); } } return -ENODEV; } -static int viot_mmio_dev_iommu_init(struct platform_device *pdev) +static int viot_mmio_dev_iommu_init(struct iommu_fwspec *fwspec, + struct platform_device *pdev) { struct resource *mem; struct viot_endpoint *ep; @@ -357,24 +357,29 @@ static int viot_mmio_dev_iommu_init(struct platform_device *pdev) list_for_each_entry(ep, &viot_mmio_endpoints, list) { if (ep->address == mem->start) - return viot_dev_iommu_init(&pdev->dev, ep->viommu, - ep->endpoint_id); + return viot_dev_iommu_init(fwspec, &pdev->dev, + ep->viommu, ep->endpoint_id); } return -ENODEV; } /** * viot_iommu_configure - Setup IOMMU ops for an endpoint described by VIOT + * @fwspec: The iommu_fwspec to fill in with fw information about the device * @dev: the endpoint * * Return: 0 on success, <0 on failure */ -int viot_iommu_configure(struct device *dev) +int viot_iommu_configure(struct iommu_fwspec *fwspec, struct device *dev) { - if (dev_is_pci(dev)) + if (dev_is_pci(dev)) { + struct viot_pci_alias_info info = { .dev = dev, + .fwspec = fwspec }; return pci_for_each_dma_alias(to_pci_dev(dev), - viot_pci_dev_iommu_init, dev); + viot_pci_dev_iommu_init, &info); + } else if (dev_is_platform(dev)) - return viot_mmio_dev_iommu_init(to_platform_device(dev)); + return viot_mmio_dev_iommu_init(fwspec, + to_platform_device(dev)); return -ENODEV; } diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index 2076345d0d6653..f7bda1c0959d34 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -2943,9 +2943,8 @@ const struct iommu_ops *iommu_ops_from_fwnode(struct fwnode_handle *fwnode) return ops; } -static int iommu_fwspec_assign_iommu(struct iommu_fwspec *fwspec, - struct device *dev, - struct fwnode_handle *iommu_fwnode) +int iommu_fwspec_assign_iommu(struct iommu_fwspec *fwspec, struct device *dev, + struct fwnode_handle *iommu_fwnode) { const struct iommu_ops *ops; diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index afeed6e72049e4..4197c0004a30b0 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -12,6 +12,8 @@ #include <linux/device.h> #include <linux/property.h> +struct iommu_fwspec; + struct acpi_handle_list { u32 count; acpi_handle* handles; @@ -628,9 +630,9 @@ struct acpi_pci_root { bool acpi_dma_supported(const struct acpi_device *adev); enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev); -int acpi_iommu_fwspec_init(struct device *dev, u32 id, - struct fwnode_handle *fwnode, - const struct iommu_ops *ops); +int acpi_iommu_fwspec_init(struct iommu_fwspec *fwspec, struct device *dev, + u32 id, struct fwnode_handle *fwnode, + bool iommu_driver_available); int acpi_dma_get_range(struct device *dev, const struct bus_dma_region **map); int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, const u32 *input_id); diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index 1cb65592c95dd3..7644922ecb0705 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -11,6 +11,8 @@ #include <linux/fwnode.h> #include <linux/irqdomain.h> +struct iommu_fwspec; + #define IORT_IRQ_MASK(irq) (irq & 0xffffffffULL) #define IORT_IRQ_TRIGGER_MASK(irq) ((irq >> 32) & 0xffffffffULL) @@ -40,7 +42,8 @@ void iort_put_rmr_sids(struct fwnode_handle *iommu_fwnode, struct list_head *head); /* IOMMU interface */ int iort_dma_get_ranges(struct device *dev, u64 *size); -int iort_iommu_configure_id(struct device *dev, const u32 *id_in); +int iort_iommu_configure_id(struct iommu_fwspec *fwspec, struct device *dev, + const u32 *id_in); void iort_iommu_get_resv_regions(struct device *dev, struct list_head *head); phys_addr_t acpi_iort_dma_get_max_cpu_address(void); #else @@ -57,7 +60,8 @@ void iort_put_rmr_sids(struct fwnode_handle *iommu_fwnode, struct list_head *hea /* IOMMU interface */ static inline int iort_dma_get_ranges(struct device *dev, u64 *size) { return -ENODEV; } -static inline int iort_iommu_configure_id(struct device *dev, const u32 *id_in) +static inline int iort_iommu_configure_id(struct iommu_fwspec *fwspec, + struct device *dev, const u32 *id_in) { return -ENODEV; } static inline void iort_iommu_get_resv_regions(struct device *dev, struct list_head *head) diff --git a/include/linux/acpi_viot.h b/include/linux/acpi_viot.h index a5a12243156377..f1874cb6d43c09 100644 --- a/include/linux/acpi_viot.h +++ b/include/linux/acpi_viot.h @@ -8,11 +8,12 @@ #ifdef CONFIG_ACPI_VIOT void __init acpi_viot_early_init(void); void __init acpi_viot_init(void); -int viot_iommu_configure(struct device *dev); +int viot_iommu_configure(struct iommu_fwspec *fwspec, struct device *dev); #else static inline void acpi_viot_early_init(void) {} static inline void acpi_viot_init(void) {} -static inline int viot_iommu_configure(struct device *dev) +static inline int viot_iommu_configure(struct iommu_fwspec *fwspec, + struct device *dev) { return -ENODEV; } diff --git a/include/linux/iommu.h b/include/linux/iommu.h index bbbba7d0a159ba..72ec71bd31a376 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -818,6 +818,8 @@ void iommu_fwspec_dealloc(struct iommu_fwspec *fwspec); int iommu_fwspec_of_xlate(struct iommu_fwspec *fwspec, struct device *dev, struct fwnode_handle *iommu_fwnode, struct of_phandle_args *iommu_spec); +int iommu_fwspec_assign_iommu(struct iommu_fwspec *fwspec, struct device *dev, + struct fwnode_handle *iommu_fwnode); int iommu_fwspec_init(struct device *dev, struct fwnode_handle *iommu_fwnode, const struct iommu_ops *ops); -- 2.42.0 _______________________________________________ linux-snps-arc mailing list linux-snps-arc@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-snps-arc