Re: [PATCH v2 05/12] ACPI/IORT: Add an input ID to acpi_dma_configure()

[Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>]

On Thu, Jul 09, 2020 at 10:35:14AM +0100, Lorenzo Pieralisi wrote:
> On Fri, Jun 19, 2020 at 09:20:06AM +0100, Lorenzo Pieralisi wrote:
> > Some HW devices are created as child devices of proprietary busses,
> > that have a bus specific policy defining how the child devices
> > wires representing the devices ID are translated into IOMMU and
> > IRQ controllers device IDs.
> > 
> > Current IORT code provides translations for:
> > 
> > - PCI devices, where the device ID is well identified at bus level
> >   as the requester ID (RID)
> > - Platform devices that are endpoint devices where the device ID is
> >   retrieved from the ACPI object IORT mappings (Named components single
> >   mappings). A platform device is represented in IORT as a named
> >   component node
> > 
> > For devices that are child devices of proprietary busses the IORT
> > firmware represents the bus node as a named component node in IORT
> > and it is up to that named component node to define in/out bus
> > specific ID translations for the bus child devices that are
> > allocated and created in a bus specific manner.
> > 
> > In order to make IORT ID translations available for proprietary
> > bus child devices, the current ACPI (and IORT) code must be
> > augmented to provide an additional ID parameter to acpi_dma_configure()
> > representing the child devices input ID. This ID is bus specific
> > and it is retrieved in bus specific code.
> > 
> > By adding an ID parameter to acpi_dma_configure(), the IORT
> > code can map the child device ID to an IOMMU stream ID through
> > the IORT named component representing the bus in/out ID mappings.
> > 
> > Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> > Cc: Will Deacon <will@kernel.org>
> > Cc: Hanjun Guo <guohanjun@huawei.com>
> > Cc: Sudeep Holla <sudeep.holla@arm.com>
> > Cc: Catalin Marinas <catalin.marinas@arm.com>
> > Cc: Robin Murphy <robin.murphy@arm.com>
> > Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> > ---
> >  drivers/acpi/arm64/iort.c | 59 +++++++++++++++++++++++++++++----------
> >  drivers/acpi/scan.c       |  8 ++++--
> >  include/acpi/acpi_bus.h   |  9 ++++--
> >  include/linux/acpi.h      |  7 +++++
> >  include/linux/acpi_iort.h |  7 +++--
> >  5 files changed, 67 insertions(+), 23 deletions(-)
> 
> Hi Rafael,
> 
> just to ask if the ACPI core changes in this patch are OK with you,
> thank you very much.

Hi Rafael,

are you OK with ACPI core changes in this patch ?

Please let me know, thanks.

Lorenzo

> Lorenzo
> 
> > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> > index 421c6976ab81..ec782e4a0fe4 100644
> > --- a/drivers/acpi/arm64/iort.c
> > +++ b/drivers/acpi/arm64/iort.c
> > @@ -978,19 +978,54 @@ static void iort_named_component_init(struct device *dev,
> >  					   nc->node_flags);
> >  }
> >  
> > +static int iort_nc_iommu_map(struct device *dev, struct acpi_iort_node *node)
> > +{
> > +	struct acpi_iort_node *parent;
> > +	int err = -ENODEV, i = 0;
> > +	u32 streamid = 0;
> > +
> > +	do {
> > +
> > +		parent = iort_node_map_platform_id(node, &streamid,
> > +						   IORT_IOMMU_TYPE,
> > +						   i++);
> > +
> > +		if (parent)
> > +			err = iort_iommu_xlate(dev, parent, streamid);
> > +	} while (parent && !err);
> > +
> > +	return err;
> > +}
> > +
> > +static int iort_nc_iommu_map_id(struct device *dev,
> > +				struct acpi_iort_node *node,
> > +				const u32 *in_id)
> > +{
> > +	struct acpi_iort_node *parent;
> > +	u32 streamid;
> > +
> > +	parent = iort_node_map_id(node, *in_id, &streamid, IORT_IOMMU_TYPE);
> > +	if (parent)
> > +		return iort_iommu_xlate(dev, parent, streamid);
> > +
> > +	return -ENODEV;
> > +}
> > +
> > +
> >  /**
> > - * iort_iommu_configure - Set-up IOMMU configuration for a device.
> > + * iort_iommu_configure_id - Set-up IOMMU configuration for a device.
> >   *
> >   * @dev: device to configure
> > + * @id_in: optional input id const value pointer
> >   *
> >   * Returns: iommu_ops pointer on configuration success
> >   *          NULL on configuration failure
> >   */
> > -const struct iommu_ops *iort_iommu_configure(struct device *dev)
> > +const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
> > +						const u32 *id_in)
> >  {
> > -	struct acpi_iort_node *node, *parent;
> > +	struct acpi_iort_node *node;
> >  	const struct iommu_ops *ops;
> > -	u32 streamid = 0;
> >  	int err = -ENODEV;
> >  
> >  	/*
> > @@ -1019,21 +1054,13 @@ const struct iommu_ops *iort_iommu_configure(struct device *dev)
> >  		if (fwspec && iort_pci_rc_supports_ats(node))
> >  			fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
> >  	} else {
> > -		int i = 0;
> > -
> >  		node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
> >  				      iort_match_node_callback, dev);
> >  		if (!node)
> >  			return NULL;
> >  
> > -		do {
> > -			parent = iort_node_map_platform_id(node, &streamid,
> > -							   IORT_IOMMU_TYPE,
> > -							   i++);
> > -
> > -			if (parent)
> > -				err = iort_iommu_xlate(dev, parent, streamid);
> > -		} while (parent && !err);
> > +		err = id_in ? iort_nc_iommu_map_id(dev, node, id_in) :
> > +			      iort_nc_iommu_map(dev, node);
> >  
> >  		if (!err)
> >  			iort_named_component_init(dev, node);
> > @@ -1058,6 +1085,7 @@ const struct iommu_ops *iort_iommu_configure(struct device *dev)
> >  
> >  	return ops;
> >  }
> > +
> >  #else
> >  static inline const struct iommu_ops *iort_fwspec_iommu_ops(struct device *dev)
> >  { return NULL; }
> > @@ -1066,7 +1094,8 @@ static inline int iort_add_device_replay(const struct iommu_ops *ops,
> >  { return 0; }
> >  int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
> >  { return 0; }
> > -const struct iommu_ops *iort_iommu_configure(struct device *dev)
> > +const struct iommu_ops *iort_iommu_configure_id(struct device *dev,
> > +						const u32 *input_id)
> >  { return NULL; }
> >  #endif
> >  
> > diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> > index 8777faced51a..2142f1554761 100644
> > --- a/drivers/acpi/scan.c
> > +++ b/drivers/acpi/scan.c
> > @@ -1457,8 +1457,10 @@ int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
> >   * acpi_dma_configure - Set-up DMA configuration for the device.
> >   * @dev: The pointer to the device
> >   * @attr: device dma attributes
> > + * @input_id: input device id const value pointer
> >   */
> > -int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
> > +int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
> > +			  const u32 *input_id)
> >  {
> >  	const struct iommu_ops *iommu;
> >  	u64 dma_addr = 0, size = 0;
> > @@ -1470,7 +1472,7 @@ int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
> >  
> >  	iort_dma_setup(dev, &dma_addr, &size);
> >  
> > -	iommu = iort_iommu_configure(dev);
> > +	iommu = iort_iommu_configure_id(dev, input_id);
> >  	if (PTR_ERR(iommu) == -EPROBE_DEFER)
> >  		return -EPROBE_DEFER;
> >  
> > @@ -1479,7 +1481,7 @@ int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr)
> >  
> >  	return 0;
> >  }
> > -EXPORT_SYMBOL_GPL(acpi_dma_configure);
> > +EXPORT_SYMBOL_GPL(acpi_dma_configure_id);
> >  
> >  static void acpi_init_coherency(struct acpi_device *adev)
> >  {
> > diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> > index 5afb6ceb284f..a3abcc4b7d9f 100644
> > --- a/include/acpi/acpi_bus.h
> > +++ b/include/acpi/acpi_bus.h
> > @@ -588,8 +588,13 @@ bool acpi_dma_supported(struct acpi_device *adev);
> >  enum dev_dma_attr acpi_get_dma_attr(struct acpi_device *adev);
> >  int acpi_dma_get_range(struct device *dev, u64 *dma_addr, u64 *offset,
> >  		       u64 *size);
> > -int acpi_dma_configure(struct device *dev, enum dev_dma_attr attr);
> > -
> > +int acpi_dma_configure_id(struct device *dev, enum dev_dma_attr attr,
> > +			   const u32 *input_id);
> > +static inline int acpi_dma_configure(struct device *dev,
> > +				     enum dev_dma_attr attr)
> > +{
> > +	return acpi_dma_configure_id(dev, attr, NULL);
> > +}
> >  struct acpi_device *acpi_find_child_device(struct acpi_device *parent,
> >  					   u64 address, bool check_children);
> >  int acpi_is_root_bridge(acpi_handle);
> > diff --git a/include/linux/acpi.h b/include/linux/acpi.h
> > index d661cd0ee64d..6d2c47489d90 100644
> > --- a/include/linux/acpi.h
> > +++ b/include/linux/acpi.h
> > @@ -905,6 +905,13 @@ static inline int acpi_dma_configure(struct device *dev,
> >  	return 0;
> >  }
> >  
> > +static inline int acpi_dma_configure_id(struct device *dev,
> > +					enum dev_dma_attr attr,
> > +					const u32 *input_id)
> > +{
> > +	return 0;
> > +}
> > +
> >  #define ACPI_PTR(_ptr)	(NULL)
> >  
> >  static inline void acpi_device_set_enumerated(struct acpi_device *adev)
> > diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
> > index e51425e083da..20a32120bb88 100644
> > --- a/include/linux/acpi_iort.h
> > +++ b/include/linux/acpi_iort.h
> > @@ -35,7 +35,8 @@ void acpi_configure_pmsi_domain(struct device *dev);
> >  int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
> >  /* IOMMU interface */
> >  void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *size);
> > -const struct iommu_ops *iort_iommu_configure(struct device *dev);
> > +const struct iommu_ops *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);
> >  #else
> >  static inline void acpi_iort_init(void) { }
> > @@ -48,8 +49,8 @@ static inline void acpi_configure_pmsi_domain(struct device *dev) { }
> >  /* IOMMU interface */
> >  static inline void iort_dma_setup(struct device *dev, u64 *dma_addr,
> >  				  u64 *size) { }
> > -static inline const struct iommu_ops *iort_iommu_configure(
> > -				      struct device *dev)
> > +static inline const struct iommu_ops *iort_iommu_configure_id(
> > +				      struct device *dev, const u32 *id_in)
> >  { return NULL; }
> >  static inline
> >  int iort_iommu_msi_get_resv_regions(struct device *dev, struct list_head *head)
> > -- 
> > 2.26.1
> > 
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