| Message ID | 20210610075130.67517-3-jean-philippe@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | Add support for ACPI VIOT | expand |
Hi jean, On 6/10/21 9:51 AM, Jean-Philippe Brucker wrote: > Extract the code that sets up the IOMMU infrastructure from IORT, since > it can be reused by VIOT. Move it one level up into a new > acpi_iommu_configure_id() function, which calls the IORT parsing > function which in turn calls the acpi_iommu_fwspec_init() helper. > > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> > --- > include/acpi/acpi_bus.h | 3 ++ > include/linux/acpi_iort.h | 8 ++--- > drivers/acpi/arm64/iort.c | 75 +++++---------------------------------- > drivers/acpi/scan.c | 73 ++++++++++++++++++++++++++++++++++++- > 4 files changed, 87 insertions(+), 72 deletions(-) > > diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h > index 3a82faac5767..41f092a269f6 100644 > --- a/include/acpi/acpi_bus.h > +++ b/include/acpi/acpi_bus.h > @@ -588,6 +588,9 @@ struct acpi_pci_root { > > bool acpi_dma_supported(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_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, > u64 *size); > int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, > diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h > index f7f054833afd..f1f0842a2cb2 100644 > --- a/include/linux/acpi_iort.h > +++ b/include/linux/acpi_iort.h > @@ -35,8 +35,7 @@ void acpi_configure_pmsi_domain(struct device *dev); > int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id); > /* IOMMU interface */ > int iort_dma_get_ranges(struct device *dev, u64 *size); > -const struct iommu_ops *iort_iommu_configure_id(struct device *dev, > - const u32 *id_in); > +int iort_iommu_configure_id(struct device *dev, const u32 *id_in); > int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head); > phys_addr_t acpi_iort_dma_get_max_cpu_address(void); > #else > @@ -50,9 +49,8 @@ static inline void acpi_configure_pmsi_domain(struct device *dev) { } > /* IOMMU interface */ > static inline int iort_dma_get_ranges(struct device *dev, u64 *size) > { return -ENODEV; } > -static inline const struct iommu_ops *iort_iommu_configure_id( > - struct device *dev, const u32 *id_in) > -{ return NULL; } > +static inline int iort_iommu_configure_id(struct device *dev, const u32 *id_in) > +{ return -ENODEV; } > static inline > int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head) > { return 0; } > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > index a940be1cf2af..b5b021e064b6 100644 > --- a/drivers/acpi/arm64/iort.c > +++ b/drivers/acpi/arm64/iort.c > @@ -806,23 +806,6 @@ static struct acpi_iort_node *iort_get_msi_resv_iommu(struct device *dev) > return NULL; > } > > -static inline const struct iommu_ops *iort_fwspec_iommu_ops(struct device *dev) > -{ > - struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); > - > - return (fwspec && fwspec->ops) ? fwspec->ops : NULL; > -} > - > -static inline int iort_add_device_replay(struct device *dev) > -{ > - int err = 0; > - > - if (dev->bus && !device_iommu_mapped(dev)) > - err = iommu_probe_device(dev); > - > - return err; > -} > - > /** > * iort_iommu_msi_get_resv_regions - Reserved region driver helper > * @dev: Device from iommu_get_resv_regions() > @@ -900,18 +883,6 @@ static inline bool iort_iommu_driver_enabled(u8 type) > } > } > > -static int arm_smmu_iort_xlate(struct device *dev, u32 streamid, > - struct fwnode_handle *fwnode, > - const struct iommu_ops *ops) > -{ > - int ret = iommu_fwspec_init(dev, fwnode, ops); > - > - if (!ret) > - ret = iommu_fwspec_add_ids(dev, &streamid, 1); > - > - return ret; > -} > - > static bool iort_pci_rc_supports_ats(struct acpi_iort_node *node) > { > struct acpi_iort_root_complex *pci_rc; > @@ -946,7 +917,7 @@ static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node, > return iort_iommu_driver_enabled(node->type) ? > -EPROBE_DEFER : -ENODEV; > > - return arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops); > + return acpi_iommu_fwspec_init(dev, streamid, iort_fwnode, ops); > } > > struct iort_pci_alias_info { > @@ -1020,24 +991,14 @@ static int iort_nc_iommu_map_id(struct device *dev, > * @dev: device to configure > * @id_in: optional input id const value pointer > * > - * Returns: iommu_ops pointer on configuration success > - * NULL on configuration failure > + * Returns: 0 on success, <0 on failure > */ > -const struct iommu_ops *iort_iommu_configure_id(struct device *dev, > - const u32 *id_in) > +int iort_iommu_configure_id(struct device *dev, const u32 *id_in) > { > struct acpi_iort_node *node; > - const struct iommu_ops *ops; > + const struct iommu_ops *ops = NULL; > int err = -ENODEV; > > - /* > - * If we already translated the fwspec there > - * is nothing left to do, return the iommu_ops. > - */ > - ops = iort_fwspec_iommu_ops(dev); > - if (ops) > - return ops; > - > if (dev_is_pci(dev)) { > struct iommu_fwspec *fwspec; > struct pci_bus *bus = to_pci_dev(dev)->bus; > @@ -1046,7 +1007,7 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev, > node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX, > iort_match_node_callback, &bus->dev); > if (!node) > - return NULL; > + return -ENODEV; > > info.node = node; > err = pci_for_each_dma_alias(to_pci_dev(dev), > @@ -1059,7 +1020,7 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev, > node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT, > iort_match_node_callback, dev); > if (!node) > - return NULL; > + return -ENODEV; > > err = id_in ? iort_nc_iommu_map_id(dev, node, id_in) : > iort_nc_iommu_map(dev, node); > @@ -1068,32 +1029,14 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev, > iort_named_component_init(dev, node); > } > > - /* > - * If we have reason to believe the IOMMU driver missed the initial > - * add_device callback for dev, replay it to get things in order. > - */ > - if (!err) { > - ops = iort_fwspec_iommu_ops(dev); > - err = iort_add_device_replay(dev); > - } > - > - /* Ignore all other errors apart from EPROBE_DEFER */ > - if (err == -EPROBE_DEFER) { > - ops = ERR_PTR(err); > - } else if (err) { > - dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); > - ops = NULL; > - } > - > - return ops; > + return err; > } > > #else > int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head) > { return 0; } > -const struct iommu_ops *iort_iommu_configure_id(struct device *dev, > - const u32 *input_id) > -{ return NULL; } > +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 ea613df8f913..0c53c8533300 100644 > --- a/drivers/acpi/scan.c > +++ b/drivers/acpi/scan.c > @@ -9,6 +9,7 @@ > #include <linux/kernel.h> > #include <linux/acpi.h> > #include <linux/acpi_iort.h> > +#include <linux/iommu.h> > #include <linux/signal.h> > #include <linux/kthread.h> > #include <linux/dmi.h> > @@ -1520,6 +1521,76 @@ int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, > return ret >= 0 ? 0 : ret; > } > > +#ifdef CONFIG_IOMMU_API > +int acpi_iommu_fwspec_init(struct device *dev, u32 id, > + struct fwnode_handle *fwnode, > + const struct iommu_ops *ops) > +{ > + int ret = iommu_fwspec_init(dev, fwnode, ops); > + > + 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; > +} > + > +static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, > + const u32 *id_in) > +{ > + int err; > + const struct iommu_ops *ops; > + > + /* > + * 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 ops; > + > + err = iort_iommu_configure_id(dev, id_in); > + > + /* > + * If we have reason to believe the IOMMU driver missed the initial > + * add_device callback for dev, replay it to get things in order. > + */ > + if (!err && dev->bus && !device_iommu_mapped(dev)) > + err = iommu_probe_device(dev); Previously we had: if (!err) { ops = iort_fwspec_iommu_ops(dev); err = iort_add_device_replay(dev); } Please can you explain the transform? I see the acpi_iommu_fwspec_ops call below but is it not straightforward to me. Also the comment mentions replay. Unsure if it is still OK. > + > + /* Ignore all other errors apart from EPROBE_DEFER */ > + if (err == -EPROBE_DEFER) { > + return ERR_PTR(err); > + } else if (err) { > + dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); > + return NULL; > + } > + return acpi_iommu_fwspec_ops(dev); > +} > + > +#else /* !CONFIG_IOMMU_API */ > + > +int acpi_iommu_fwspec_init(struct device *dev, u32 id, > + struct fwnode_handle *fwnode, > + const struct iommu_ops *ops) > +{ > + return -ENODEV; > +} > + > +static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, > + const u32 *id_in) > +{ > + return NULL; > +} > + > +#endif /* !CONFIG_IOMMU_API */ > + > /** > * acpi_dma_configure_id - Set-up DMA configuration for the device. > * @dev: The pointer to the device > @@ -1539,7 +1610,7 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, > > acpi_arch_dma_setup(dev, &dma_addr, &size); > > - iommu = iort_iommu_configure_id(dev, input_id); > + iommu = acpi_iommu_configure_id(dev, input_id); > if (PTR_ERR(iommu) == -EPROBE_DEFER) > return -EPROBE_DEFER; > Thanks Eric
Hi Eric, On Wed, Jun 16, 2021 at 11:35:13AM +0200, Eric Auger wrote: > > -const struct iommu_ops *iort_iommu_configure_id(struct device *dev, > > - const u32 *id_in) > > +int iort_iommu_configure_id(struct device *dev, const u32 *id_in) > > { > > struct acpi_iort_node *node; > > - const struct iommu_ops *ops; > > + const struct iommu_ops *ops = NULL; Oops, I need to remove this (and add -Werror to my tests.) > > +static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, > > + const u32 *id_in) > > +{ > > + int err; > > + const struct iommu_ops *ops; > > + > > + /* > > + * 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 ops; > > + > > + err = iort_iommu_configure_id(dev, id_in); > > + > > + /* > > + * If we have reason to believe the IOMMU driver missed the initial > > + * add_device callback for dev, replay it to get things in order. > > + */ > > + if (!err && dev->bus && !device_iommu_mapped(dev)) > > + err = iommu_probe_device(dev); > Previously we had: > if (!err) { > ops = iort_fwspec_iommu_ops(dev); > err = iort_add_device_replay(dev); > } > > Please can you explain the transform? I see the > > acpi_iommu_fwspec_ops call below but is it not straightforward to me. I figured that iort_add_device_replay() is only used once and is sufficiently simple to be inlined manually (saving 10 lines). Then I replaced the ops assignment with returns, which saves another line and may be slightly clearer? I guess it's mostly a matter of taste, the behavior should be exactly the same. > Also the comment mentions replay. Unsure if it is still OK. The "replay" part is, but "add_device" isn't accurate because it has since been replaced by probe_device. I'll refresh the comment. Thanks, Jean
On 2021-06-18 08:41, Jean-Philippe Brucker wrote: > Hi Eric, > > On Wed, Jun 16, 2021 at 11:35:13AM +0200, Eric Auger wrote: >>> -const struct iommu_ops *iort_iommu_configure_id(struct device *dev, >>> - const u32 *id_in) >>> +int iort_iommu_configure_id(struct device *dev, const u32 *id_in) >>> { >>> struct acpi_iort_node *node; >>> - const struct iommu_ops *ops; >>> + const struct iommu_ops *ops = NULL; > > Oops, I need to remove this (and add -Werror to my tests.) > > >>> +static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, >>> + const u32 *id_in) >>> +{ >>> + int err; >>> + const struct iommu_ops *ops; >>> + >>> + /* >>> + * 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 ops; >>> + >>> + err = iort_iommu_configure_id(dev, id_in); >>> + >>> + /* >>> + * If we have reason to believe the IOMMU driver missed the initial >>> + * add_device callback for dev, replay it to get things in order. >>> + */ >>> + if (!err && dev->bus && !device_iommu_mapped(dev)) >>> + err = iommu_probe_device(dev); >> Previously we had: >> if (!err) { >> ops = iort_fwspec_iommu_ops(dev); >> err = iort_add_device_replay(dev); >> } >> >> Please can you explain the transform? I see the >> >> acpi_iommu_fwspec_ops call below but is it not straightforward to me. > > I figured that iort_add_device_replay() is only used once and is > sufficiently simple to be inlined manually (saving 10 lines). Then I > replaced the ops assignment with returns, which saves another line and may > be slightly clearer? I guess it's mostly a matter of taste, the behavior > should be exactly the same. Right, IIRC the multiple assignments to ops were more of a haphazard evolution inherited from the DT version, and looking at it now I think the multiple-return is indeed a bit nicer. Similarly, it looks like the factoring out of iort_add_device_replay() was originally an attempt to encapsulate the IOMMU_API dependency, but things have moved around a lot since then, so that seems like a sensible simplification to make too. Robin. > >> Also the comment mentions replay. Unsure if it is still OK. > > The "replay" part is, but "add_device" isn't accurate because it has since > been replaced by probe_device. I'll refresh the comment. > > Thanks, > Jean > _______________________________________________ > iommu mailing list > iommu@lists.linux-foundation.org > https://lists.linuxfoundation.org/mailman/listinfo/iommu >
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 3a82faac5767..41f092a269f6 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -588,6 +588,9 @@ struct acpi_pci_root { bool acpi_dma_supported(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_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, u64 *size); int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h index f7f054833afd..f1f0842a2cb2 100644 --- a/include/linux/acpi_iort.h +++ b/include/linux/acpi_iort.h @@ -35,8 +35,7 @@ void acpi_configure_pmsi_domain(struct device *dev); int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id); /* IOMMU interface */ int iort_dma_get_ranges(struct device *dev, u64 *size); -const struct iommu_ops *iort_iommu_configure_id(struct device *dev, - const u32 *id_in); +int iort_iommu_configure_id(struct device *dev, const u32 *id_in); int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head); phys_addr_t acpi_iort_dma_get_max_cpu_address(void); #else @@ -50,9 +49,8 @@ static inline void acpi_configure_pmsi_domain(struct device *dev) { } /* IOMMU interface */ static inline int iort_dma_get_ranges(struct device *dev, u64 *size) { return -ENODEV; } -static inline const struct iommu_ops *iort_iommu_configure_id( - struct device *dev, const u32 *id_in) -{ return NULL; } +static inline int iort_iommu_configure_id(struct device *dev, const u32 *id_in) +{ return -ENODEV; } static inline int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head) { return 0; } diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index a940be1cf2af..b5b021e064b6 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -806,23 +806,6 @@ static struct acpi_iort_node *iort_get_msi_resv_iommu(struct device *dev) return NULL; } -static inline const struct iommu_ops *iort_fwspec_iommu_ops(struct device *dev) -{ - struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev); - - return (fwspec && fwspec->ops) ? fwspec->ops : NULL; -} - -static inline int iort_add_device_replay(struct device *dev) -{ - int err = 0; - - if (dev->bus && !device_iommu_mapped(dev)) - err = iommu_probe_device(dev); - - return err; -} - /** * iort_iommu_msi_get_resv_regions - Reserved region driver helper * @dev: Device from iommu_get_resv_regions() @@ -900,18 +883,6 @@ static inline bool iort_iommu_driver_enabled(u8 type) } } -static int arm_smmu_iort_xlate(struct device *dev, u32 streamid, - struct fwnode_handle *fwnode, - const struct iommu_ops *ops) -{ - int ret = iommu_fwspec_init(dev, fwnode, ops); - - if (!ret) - ret = iommu_fwspec_add_ids(dev, &streamid, 1); - - return ret; -} - static bool iort_pci_rc_supports_ats(struct acpi_iort_node *node) { struct acpi_iort_root_complex *pci_rc; @@ -946,7 +917,7 @@ static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node, return iort_iommu_driver_enabled(node->type) ? -EPROBE_DEFER : -ENODEV; - return arm_smmu_iort_xlate(dev, streamid, iort_fwnode, ops); + return acpi_iommu_fwspec_init(dev, streamid, iort_fwnode, ops); } struct iort_pci_alias_info { @@ -1020,24 +991,14 @@ static int iort_nc_iommu_map_id(struct device *dev, * @dev: device to configure * @id_in: optional input id const value pointer * - * Returns: iommu_ops pointer on configuration success - * NULL on configuration failure + * Returns: 0 on success, <0 on failure */ -const struct iommu_ops *iort_iommu_configure_id(struct device *dev, - const u32 *id_in) +int iort_iommu_configure_id(struct device *dev, const u32 *id_in) { struct acpi_iort_node *node; - const struct iommu_ops *ops; + const struct iommu_ops *ops = NULL; int err = -ENODEV; - /* - * If we already translated the fwspec there - * is nothing left to do, return the iommu_ops. - */ - ops = iort_fwspec_iommu_ops(dev); - if (ops) - return ops; - if (dev_is_pci(dev)) { struct iommu_fwspec *fwspec; struct pci_bus *bus = to_pci_dev(dev)->bus; @@ -1046,7 +1007,7 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev, node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX, iort_match_node_callback, &bus->dev); if (!node) - return NULL; + return -ENODEV; info.node = node; err = pci_for_each_dma_alias(to_pci_dev(dev), @@ -1059,7 +1020,7 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev, node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT, iort_match_node_callback, dev); if (!node) - return NULL; + return -ENODEV; err = id_in ? iort_nc_iommu_map_id(dev, node, id_in) : iort_nc_iommu_map(dev, node); @@ -1068,32 +1029,14 @@ const struct iommu_ops *iort_iommu_configure_id(struct device *dev, iort_named_component_init(dev, node); } - /* - * If we have reason to believe the IOMMU driver missed the initial - * add_device callback for dev, replay it to get things in order. - */ - if (!err) { - ops = iort_fwspec_iommu_ops(dev); - err = iort_add_device_replay(dev); - } - - /* Ignore all other errors apart from EPROBE_DEFER */ - if (err == -EPROBE_DEFER) { - ops = ERR_PTR(err); - } else if (err) { - dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); - ops = NULL; - } - - return ops; + return err; } #else int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head) { return 0; } -const struct iommu_ops *iort_iommu_configure_id(struct device *dev, - const u32 *input_id) -{ return NULL; } +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 ea613df8f913..0c53c8533300 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -9,6 +9,7 @@ #include <linux/kernel.h> #include <linux/acpi.h> #include <linux/acpi_iort.h> +#include <linux/iommu.h> #include <linux/signal.h> #include <linux/kthread.h> #include <linux/dmi.h> @@ -1520,6 +1521,76 @@ int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset, return ret >= 0 ? 0 : ret; } +#ifdef CONFIG_IOMMU_API +int acpi_iommu_fwspec_init(struct device *dev, u32 id, + struct fwnode_handle *fwnode, + const struct iommu_ops *ops) +{ + int ret = iommu_fwspec_init(dev, fwnode, ops); + + 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; +} + +static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, + const u32 *id_in) +{ + int err; + const struct iommu_ops *ops; + + /* + * 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 ops; + + err = iort_iommu_configure_id(dev, id_in); + + /* + * If we have reason to believe the IOMMU driver missed the initial + * add_device callback for dev, replay it to get things in order. + */ + if (!err && dev->bus && !device_iommu_mapped(dev)) + err = iommu_probe_device(dev); + + /* Ignore all other errors apart from EPROBE_DEFER */ + if (err == -EPROBE_DEFER) { + return ERR_PTR(err); + } else if (err) { + dev_dbg(dev, "Adding to IOMMU failed: %d\n", err); + return NULL; + } + return acpi_iommu_fwspec_ops(dev); +} + +#else /* !CONFIG_IOMMU_API */ + +int acpi_iommu_fwspec_init(struct device *dev, u32 id, + struct fwnode_handle *fwnode, + const struct iommu_ops *ops) +{ + return -ENODEV; +} + +static const struct iommu_ops *acpi_iommu_configure_id(struct device *dev, + const u32 *id_in) +{ + return NULL; +} + +#endif /* !CONFIG_IOMMU_API */ + /** * acpi_dma_configure_id - Set-up DMA configuration for the device. * @dev: The pointer to the device @@ -1539,7 +1610,7 @@ int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr, acpi_arch_dma_setup(dev, &dma_addr, &size); - iommu = iort_iommu_configure_id(dev, input_id); + iommu = acpi_iommu_configure_id(dev, input_id); if (PTR_ERR(iommu) == -EPROBE_DEFER) return -EPROBE_DEFER;
Extract the code that sets up the IOMMU infrastructure from IORT, since it can be reused by VIOT. Move it one level up into a new acpi_iommu_configure_id() function, which calls the IORT parsing function which in turn calls the acpi_iommu_fwspec_init() helper. Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> --- include/acpi/acpi_bus.h | 3 ++ include/linux/acpi_iort.h | 8 ++--- drivers/acpi/arm64/iort.c | 75 +++++---------------------------------- drivers/acpi/scan.c | 73 ++++++++++++++++++++++++++++++++++++- 4 files changed, 87 insertions(+), 72 deletions(-) -- 2.31.1