On Wed, May 31, 2017 at 03:32:12PM +0100, shameer wrote:
> This provides a helper function to find and retrieve the ITS
> base address from the ID mappings array reference of a device
> IORT node(if any).
>
> This is used in the subsequent patch to retrieve the ITS base
> address associated with a pci dev IORT node.
"Add an IORT helper function to retrieve the ITS data through IORT
device<->ITS mappings".
> Signed-off-by: shameer <shameerali.kolothum.thodi@xxxxxxxxxx>
> ---
> drivers/acpi/arm64/iort.c | 47 +++++++++++++++++++++++++++++++++++++---
> drivers/irqchip/irq-gic-v3-its.c | 3 ++-
> include/linux/acpi_iort.h | 8 ++++++-
> 3 files changed, 53 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index c5fecf9..12d7347 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -34,6 +34,7 @@
> struct iort_its_msi_chip {
> struct list_head list;
> struct fwnode_handle *fw_node;
> + u64 base_addr;
phys_addr_t
> u32 translation_id;
> };
>
> @@ -132,13 +133,14 @@ typedef acpi_status (*iort_find_node_callback)
>
> /**
> * iort_register_domain_token() - register domain token and related ITS ID
> - * to the list from where we can get it back later on.
> + * and base address to the list from where we can get it back later on.
> * @trans_id: ITS ID.
Missing something here
> * @fw_node: Domain token.
> *
> * Returns: 0 on success, -ENOMEM if no memory when allocating list element
> */
> -int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node)
> +int iort_register_domain_token(int trans_id, u64 base,
phys_addr_t
> + struct fwnode_handle *fw_node)
> {
> struct iort_its_msi_chip *its_msi_chip;
>
> @@ -148,6 +150,7 @@ int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node)
>
> its_msi_chip->fw_node = fw_node;
> its_msi_chip->translation_id = trans_id;
> + its_msi_chip->base_addr = base;
>
> spin_lock(&iort_msi_chip_lock);
> list_add(&its_msi_chip->list, &iort_msi_chip_list);
> @@ -370,7 +373,6 @@ static struct acpi_iort_node *iort_node_map_id(struct acpi_iort_node *node,
>
> if (!node->mapping_offset || !node->mapping_count)
> goto fail_map;
> -
Unrelated change.
> map = ACPI_ADD_PTR(struct acpi_iort_id_mapping, node,
> node->mapping_offset);
>
> @@ -491,6 +493,45 @@ int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
> return -ENODEV;
> }
>
> +int iort_dev_find_its_base(struct device *dev, u32 req_id,
> + unsigned int idx, u64 *its_base)
> +{
> + struct acpi_iort_its_group *its;
> + struct acpi_iort_node *node;
> + struct iort_its_msi_chip *its_msi_chip;
> + u32 trans_id;
> +
> + node = iort_find_dev_node(dev);
> + if (!node)
> + return -ENXIO;
-ENODEV, throughout
> +
> + node = iort_node_map_id(node, req_id, NULL, IORT_MSI_TYPE);
> + if (!node)
> + return -ENXIO;
> +
> + /* Move to ITS specific data */
> + its = (struct acpi_iort_its_group *)node->node_data;
> + if (idx > its->its_count) {
> + dev_err(dev, "requested ITS ID index [%d] is greater than available [%d]\n",
> + idx, its->its_count);
> + return -ENXIO;
> + }
> +
> + trans_id = its->identifiers[idx];
> +
> + spin_lock(&iort_msi_chip_lock);
> + list_for_each_entry(its_msi_chip, &iort_msi_chip_list, list) {
> + if (its_msi_chip->translation_id == trans_id) {
> + *its_base = its_msi_chip->base_addr;
> + spin_unlock(&iort_msi_chip_lock);
> + return 0;
> + }
> + }
> + spin_unlock(&iort_msi_chip_lock);
> +
> + return -ENXIO;
Cosmetics:
bool match = false;
[...]
spin_lock(&iort_msi_chip_lock);
list_for_each_entry(its_msi_chip, &iort_msi_chip_list, list) {
if (its_msi_chip->translation_id == trans_id) {
*its_base = its_msi_chip->base_addr;
match = true;
break;
}
}
spin_unlock(&iort_msi_chip_lock);
return match ? 0 : -ENODEV;
}
> /**
> * iort_dev_find_its_id() - Find the ITS identifier for a device
> * @dev: The device.
> diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c
> index 45ea1933..c45a2ad 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -1854,7 +1854,8 @@ static int __init gic_acpi_parse_madt_its(struct acpi_subtable_header *header,
> return -ENOMEM;
> }
>
> - err = iort_register_domain_token(its_entry->translation_id, dom_handle);
> + err = iort_register_domain_token(its_entry->translation_id, res.start,
> + dom_handle);
> if (err) {
> pr_err("ITS@%pa: Unable to register GICv3 ITS domain token (ITS ID %d) to IORT\n",
> &res.start, its_entry->translation_id);
> diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
> index 3ff9ace..bf7b53d 100644
> --- a/include/linux/acpi_iort.h
> +++ b/include/linux/acpi_iort.h
> @@ -26,7 +26,8 @@
> #define IORT_IRQ_MASK(irq) (irq & 0xffffffffULL)
> #define IORT_IRQ_TRIGGER_MASK(irq) ((irq >> 32) & 0xffffffffULL)
>
> -int iort_register_domain_token(int trans_id, struct fwnode_handle *fw_node);
> +int iort_register_domain_token(int trans_id, u64 base,
> + struct fwnode_handle *fw_node);
> void iort_deregister_domain_token(int trans_id);
> struct fwnode_handle *iort_find_domain_token(int trans_id);
> #ifdef CONFIG_ACPI_IORT
> @@ -36,6 +37,8 @@
> struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
> void acpi_configure_pmsi_domain(struct device *dev);
> int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
> +int iort_dev_find_its_base(struct device *dev, u32 req_id,
> + unsigned int idx, u64 *its_base);
> /* IOMMU interface */
> void iort_set_dma_mask(struct device *dev);
> const struct iommu_ops *iort_iommu_configure(struct device *dev);
> @@ -48,6 +51,9 @@ static inline struct irq_domain *iort_get_device_domain(struct device *dev,
> u32 req_id)
> { return NULL; }
> static inline void acpi_configure_pmsi_domain(struct device *dev) { }
> +int iort_dev_find_its_base(struct device *dev, u32 req_id,
> + unsigned int idx, u64 *its_base)
> +{ return -ENOSYS; }
-ENODEV
Thanks,
Lorenzo
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