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@xxxxxxxxxx>
> ---
> 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
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