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 at 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
Jean-Philippe Brucker
2021-Jun-18 07:41 UTC
[PATCH v4 2/6] ACPI: Move IOMMU setup code out of IORT
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