diff mbox series

[03/30] ACPI: IORT: Make a iort_iommu_for_each_id()

Message ID 3-v1-f82a05539a64+5042-iommu_fwspec_p2_jgg@nvidia.com (mailing list archive)
State Handled Elsewhere
Headers show
Series Make a new API for drivers to use to get their FW | expand

Commit Message

Jason Gunthorpe Nov. 30, 2023, 1:10 a.m. UTC 
Similar to of_iommu_for_each_id() this parses the IORT ACPI description
and invokes a function over each entry in the table.

Have iort_iommu_configure_id() use the new function to call
iort_iommu_xlate().

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/acpi/arm64/iort.c | 118 ++++++++++++++++++++++++--------------
 include/linux/acpi_iort.h |  12 ++++
 2 files changed, 86 insertions(+), 44 deletions(-)

Comments

Rafael J. Wysocki Nov. 30, 2023, 1:21 p.m. UTC | #1 
On Thu, Nov 30, 2023 at 2:11 AM Jason Gunthorpe <jgg@nvidia.com> wrote:
>
> Similar to of_iommu_for_each_id() this parses the IORT ACPI description
> and invokes a function over each entry in the table.
>
> Have iort_iommu_configure_id() use the new function to call
> iort_iommu_xlate().
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

> ---
>  drivers/acpi/arm64/iort.c | 118 ++++++++++++++++++++++++--------------
>  include/linux/acpi_iort.h |  12 ++++
>  2 files changed, 86 insertions(+), 44 deletions(-)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index bdaf9256870d92..5c9b4c23f96a87 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -1218,9 +1218,10 @@ 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 acpi_iort_node *node, u32 streamid,
> +                           void *info)
>  {
> +       struct device *dev = info;
>         const struct iommu_ops *ops;
>         struct fwnode_handle *iort_fwnode;
>
> @@ -1250,9 +1251,11 @@ static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node,
>  struct iort_pci_alias_info {
>         struct device *dev;
>         struct acpi_iort_node *node;
> +       iort_for_each_fn fn;
> +       void *info;
>  };
>
> -static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
> +static int __for_each_pci_alias(struct pci_dev *pdev, u16 alias, void *data)
>  {
>         struct iort_pci_alias_info *info = data;
>         struct acpi_iort_node *parent;
> @@ -1260,7 +1263,7 @@ 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 info->fn(parent, streamid, info->info);
>  }
>
>  static void iort_named_component_init(struct device *dev,
> @@ -1280,7 +1283,8 @@ 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 __for_each_platform(struct acpi_iort_node *node, iort_for_each_fn fn,
> +                              void *info)
>  {
>         struct acpi_iort_node *parent;
>         int err = -ENODEV, i = 0;
> @@ -1293,27 +1297,71 @@ 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 = fn(parent, streamid, info);
>         } while (parent && !err);
>
>         return err;
>  }
>
> -static int iort_nc_iommu_map_id(struct device *dev,
> -                               struct acpi_iort_node *node,
> -                               const u32 *in_id)
> +int iort_iommu_for_each_id(struct device *dev, const u32 *id_in,
> +                          struct iort_params *params, iort_for_each_fn fn,
> +                          void *info)
>  {
> -       struct acpi_iort_node *parent;
> -       u32 streamid;
> +       struct acpi_iort_named_component *nc;
> +       struct acpi_iort_node *node;
> +       int err = -ENODEV;
>
> -       parent = iort_node_map_id(node, *in_id, &streamid, IORT_IOMMU_TYPE);
> -       if (parent)
> -               return iort_iommu_xlate(dev, parent, streamid);
> +       memset(params, 0, sizeof(*params));
> +       if (dev_is_pci(dev)) {
> +               struct pci_bus *bus = to_pci_dev(dev)->bus;
> +               struct iort_pci_alias_info pci_info = { .dev = dev,
> +                                                       .fn = fn,
> +                                                       .info = info };
>
> -       return -ENODEV;
> +               node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
> +                                     iort_match_node_callback, &bus->dev);
> +               if (!node)
> +                       return -ENODEV;
> +
> +               pci_info.node = node;
> +               err = pci_for_each_dma_alias(to_pci_dev(dev),
> +                                            __for_each_pci_alias, &pci_info);
> +
> +               if (iort_pci_rc_supports_ats(node))
> +                       params->pci_rc_ats = true;
> +               return 0;
> +       }
> +
> +       node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
> +                             iort_match_node_callback, dev);
> +       if (!node)
> +               return -ENODEV;
> +
> +       if (id_in) {
> +               struct acpi_iort_node *parent;
> +               u32 streamid;
> +
> +               parent = iort_node_map_id(node, *id_in, &streamid,
> +                                         IORT_IOMMU_TYPE);
> +               if (!parent)
> +                       return -ENODEV;
> +               err = fn(parent, streamid, info);
> +       } else {
> +               err = __for_each_platform(node, fn, info);
> +       }
> +       if (err)
> +               return err;
> +
> +       nc = (struct acpi_iort_named_component *)node->node_data;
> +       params->pasid_num_bits = FIELD_GET(ACPI_IORT_NC_PASID_BITS,
> +                                               nc->node_flags);
> +       if (nc->node_flags & ACPI_IORT_NC_STALL_SUPPORTED)
> +               params->dma_can_stall = true;
> +
> +       iort_named_component_init(dev, node);
> +       return 0;
>  }
>
> -
>  /**
>   * iort_iommu_configure_id - Set-up IOMMU configuration for a device.
>   *
> @@ -1324,40 +1372,22 @@ static int iort_nc_iommu_map_id(struct device *dev,
>   */
>  int iort_iommu_configure_id(struct device *dev, const u32 *id_in)
>  {
> -       struct acpi_iort_node *node;
> -       int err = -ENODEV;
> +       struct iort_params params;
> +       int err;
>
> -       if (dev_is_pci(dev)) {
> +       err = iort_iommu_for_each_id(dev, id_in, &params, &iort_iommu_xlate,
> +                                    dev);
> +       if (err)
> +               return err;
> +
> +       if (params.pci_rc_ats) {
>                 struct iommu_fwspec *fwspec;
> -               struct pci_bus *bus = to_pci_dev(dev)->bus;
> -               struct iort_pci_alias_info info = { .dev = dev };
> -
> -               node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
> -                                     iort_match_node_callback, &bus->dev);
> -               if (!node)
> -                       return -ENODEV;
> -
> -               info.node = node;
> -               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 (fwspec)
>                         fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
> -       } else {
> -               node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
> -                                     iort_match_node_callback, dev);
> -               if (!node)
> -                       return -ENODEV;
> -
> -               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);
>         }
> -
> -       return err;
> +       return 0;
>  }
>
>  #else
> diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
> index 1cb65592c95dd3..5423abff9b6b09 100644
> --- a/include/linux/acpi_iort.h
> +++ b/include/linux/acpi_iort.h
> @@ -29,6 +29,18 @@ void iort_deregister_domain_token(int trans_id);
>  struct fwnode_handle *iort_find_domain_token(int trans_id);
>  int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
>
> +struct iort_params {
> +       unsigned int pasid_num_bits;
> +       bool dma_can_stall : 1;
> +       bool pci_rc_ats : 1;
> +};
> +
> +typedef int (*iort_for_each_fn)(struct acpi_iort_node *iommu, u32 streamid,
> +                               void *info);
> +int iort_iommu_for_each_id(struct device *dev, const u32 *id_in,
> +                          struct iort_params *params, iort_for_each_fn fn,
> +                          void *info);
> +
>  #ifdef CONFIG_ACPI_IORT
>  u32 iort_msi_map_id(struct device *dev, u32 id);
>  struct irq_domain *iort_get_device_domain(struct device *dev, u32 id,
> --
> 2.42.0
>
diff mbox series

Patch

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index bdaf9256870d92..5c9b4c23f96a87 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -1218,9 +1218,10 @@  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 acpi_iort_node *node, u32 streamid,
+			    void *info)
 {
+	struct device *dev = info;
 	const struct iommu_ops *ops;
 	struct fwnode_handle *iort_fwnode;
 
@@ -1250,9 +1251,11 @@  static int iort_iommu_xlate(struct device *dev, struct acpi_iort_node *node,
 struct iort_pci_alias_info {
 	struct device *dev;
 	struct acpi_iort_node *node;
+	iort_for_each_fn fn;
+	void *info;
 };
 
-static int iort_pci_iommu_init(struct pci_dev *pdev, u16 alias, void *data)
+static int __for_each_pci_alias(struct pci_dev *pdev, u16 alias, void *data)
 {
 	struct iort_pci_alias_info *info = data;
 	struct acpi_iort_node *parent;
@@ -1260,7 +1263,7 @@  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 info->fn(parent, streamid, info->info);
 }
 
 static void iort_named_component_init(struct device *dev,
@@ -1280,7 +1283,8 @@  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 __for_each_platform(struct acpi_iort_node *node, iort_for_each_fn fn,
+			       void *info)
 {
 	struct acpi_iort_node *parent;
 	int err = -ENODEV, i = 0;
@@ -1293,27 +1297,71 @@  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 = fn(parent, streamid, info);
 	} while (parent && !err);
 
 	return err;
 }
 
-static int iort_nc_iommu_map_id(struct device *dev,
-				struct acpi_iort_node *node,
-				const u32 *in_id)
+int iort_iommu_for_each_id(struct device *dev, const u32 *id_in,
+			   struct iort_params *params, iort_for_each_fn fn,
+			   void *info)
 {
-	struct acpi_iort_node *parent;
-	u32 streamid;
+	struct acpi_iort_named_component *nc;
+	struct acpi_iort_node *node;
+	int err = -ENODEV;
 
-	parent = iort_node_map_id(node, *in_id, &streamid, IORT_IOMMU_TYPE);
-	if (parent)
-		return iort_iommu_xlate(dev, parent, streamid);
+	memset(params, 0, sizeof(*params));
+	if (dev_is_pci(dev)) {
+		struct pci_bus *bus = to_pci_dev(dev)->bus;
+		struct iort_pci_alias_info pci_info = { .dev = dev,
+							.fn = fn,
+							.info = info };
 
-	return -ENODEV;
+		node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
+				      iort_match_node_callback, &bus->dev);
+		if (!node)
+			return -ENODEV;
+
+		pci_info.node = node;
+		err = pci_for_each_dma_alias(to_pci_dev(dev),
+					     __for_each_pci_alias, &pci_info);
+
+		if (iort_pci_rc_supports_ats(node))
+			params->pci_rc_ats = true;
+		return 0;
+	}
+
+	node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
+			      iort_match_node_callback, dev);
+	if (!node)
+		return -ENODEV;
+
+	if (id_in) {
+		struct acpi_iort_node *parent;
+		u32 streamid;
+
+		parent = iort_node_map_id(node, *id_in, &streamid,
+					  IORT_IOMMU_TYPE);
+		if (!parent)
+			return -ENODEV;
+		err = fn(parent, streamid, info);
+	} else {
+		err = __for_each_platform(node, fn, info);
+	}
+	if (err)
+		return err;
+
+	nc = (struct acpi_iort_named_component *)node->node_data;
+	params->pasid_num_bits = FIELD_GET(ACPI_IORT_NC_PASID_BITS,
+						nc->node_flags);
+	if (nc->node_flags & ACPI_IORT_NC_STALL_SUPPORTED)
+		params->dma_can_stall = true;
+
+	iort_named_component_init(dev, node);
+	return 0;
 }
 
-
 /**
  * iort_iommu_configure_id - Set-up IOMMU configuration for a device.
  *
@@ -1324,40 +1372,22 @@  static int iort_nc_iommu_map_id(struct device *dev,
  */
 int iort_iommu_configure_id(struct device *dev, const u32 *id_in)
 {
-	struct acpi_iort_node *node;
-	int err = -ENODEV;
+	struct iort_params params;
+	int err;
 
-	if (dev_is_pci(dev)) {
+	err = iort_iommu_for_each_id(dev, id_in, &params, &iort_iommu_xlate,
+				     dev);
+	if (err)
+		return err;
+
+	if (params.pci_rc_ats) {
 		struct iommu_fwspec *fwspec;
-		struct pci_bus *bus = to_pci_dev(dev)->bus;
-		struct iort_pci_alias_info info = { .dev = dev };
-
-		node = iort_scan_node(ACPI_IORT_NODE_PCI_ROOT_COMPLEX,
-				      iort_match_node_callback, &bus->dev);
-		if (!node)
-			return -ENODEV;
-
-		info.node = node;
-		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 (fwspec)
 			fwspec->flags |= IOMMU_FWSPEC_PCI_RC_ATS;
-	} else {
-		node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
-				      iort_match_node_callback, dev);
-		if (!node)
-			return -ENODEV;
-
-		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);
 	}
-
-	return err;
+	return 0;
 }
 
 #else
diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
index 1cb65592c95dd3..5423abff9b6b09 100644
--- a/include/linux/acpi_iort.h
+++ b/include/linux/acpi_iort.h
@@ -29,6 +29,18 @@  void iort_deregister_domain_token(int trans_id);
 struct fwnode_handle *iort_find_domain_token(int trans_id);
 int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
 
+struct iort_params {
+	unsigned int pasid_num_bits;
+	bool dma_can_stall : 1;
+	bool pci_rc_ats : 1;
+};
+
+typedef int (*iort_for_each_fn)(struct acpi_iort_node *iommu, u32 streamid,
+				void *info);
+int iort_iommu_for_each_id(struct device *dev, const u32 *id_in,
+			   struct iort_params *params, iort_for_each_fn fn,
+			   void *info);
+
 #ifdef CONFIG_ACPI_IORT
 u32 iort_msi_map_id(struct device *dev, u32 id);
 struct irq_domain *iort_get_device_domain(struct device *dev, u32 id,