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SubjectRe: [PATCH v4 04/15] drivers: acpi: iort: add support for IOMMU fwnode registration
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On 2016/8/15 23:23, Lorenzo Pieralisi wrote:
> The ACPI IORT table provide entries for IOMMU (aka SMMU in ARM world)
> components that allow creating the kernel data structures required to
> probe and initialize the IOMMU devices.
>
> This patch provides support in the IORT kernel code to register IOMMU
> components and their respective fwnode.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Hanjun Guo <hanjun.guo@linaro.org>
> Cc: Tomasz Nowicki <tn@semihalf.com>
> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
> ---
> drivers/acpi/arm64/iort.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/iort.h | 8 ++++++
> 2 files changed, 73 insertions(+)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index cad7d1d..01a5258 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -20,7 +20,9 @@
>
> #include <linux/iort.h>
> #include <linux/kernel.h>
> +#include <linux/list.h>
> #include <linux/pci.h>
> +#include <linux/slab.h>
>
> struct iort_its_msi_chip {
> struct list_head list;
> @@ -28,6 +30,69 @@ struct iort_its_msi_chip {
> u32 translation_id;
> };
>
> +struct iort_fwnode {
> + struct list_head list;
> + struct acpi_iort_node *iort_node;
> + struct fwnode_handle *fwnode;
> +};
> +static LIST_HEAD(iort_fwnode_list);
> +static DEFINE_SPINLOCK(iort_fwnode_lock);
> +
> +/**
> + * iort_set_fwnode() - Create iort_fwnode and use it to register
> + * iommu data in the iort_fwnode_list
> + *
> + * @node: IORT table node associated with the IOMMU
> + * @fwnode: fwnode associated with the IORT node
> + *
> + * Returns: 0 on success
> + * <0 on failure
> + */
> +int iort_set_fwnode(struct acpi_iort_node *iort_node,
> + struct fwnode_handle *fwnode)
> +{
> + struct iort_fwnode *np;
> +
> + np = kzalloc(sizeof(struct iort_fwnode), GFP_ATOMIC);
> +
> + if (WARN_ON(!np))
> + return -ENOMEM;
> +
> + INIT_LIST_HEAD(&np->list);
> + np->iort_node = iort_node;
> + np->fwnode = fwnode;
> +
> + spin_lock(&iort_fwnode_lock);
> + list_add_tail(&np->list, &iort_fwnode_list);
> + spin_unlock(&iort_fwnode_lock);
> +
> + return 0;
> +}
> +
> +/**
> + * iort_get_fwnode() - Retrieve fwnode associated with an IORT node
> + *
> + * @node: IORT table node to be looked-up
> + *
> + * Returns: fwnode_handle pointer on success, NULL on failure
> +*/
> +struct fwnode_handle *iort_get_fwnode(struct acpi_iort_node *node)
> +{
> + struct iort_fwnode *curr;
> + struct fwnode_handle *fwnode = NULL;
> +
> + spin_lock(&iort_fwnode_lock);
> + list_for_each_entry(curr, &iort_fwnode_list, list) {
> + if (curr->iort_node == node) {
> + fwnode = curr->fwnode;
> + break;
> + }
> + }
> + spin_unlock(&iort_fwnode_lock);
> +
> + return fwnode;
> +}
> +
> typedef acpi_status (*iort_find_node_callback)
> (struct acpi_iort_node *node, void *context);
>
> diff --git a/include/linux/iort.h b/include/linux/iort.h
> index 9bb30c5..666a3de 100644
> --- a/include/linux/iort.h
> +++ b/include/linux/iort.h
> @@ -30,12 +30,20 @@ struct fwnode_handle *iort_find_domain_token(int trans_id);
> void iort_table_detect(void);
> u32 iort_msi_map_rid(struct device *dev, u32 req_id);
> struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
> +int iort_set_fwnode(struct acpi_iort_node *iort_node,
> + struct fwnode_handle *fwnode);
> +struct fwnode_handle *iort_get_fwnode(struct acpi_iort_node *node);
> #else
> static inline void iort_table_detect(void) { }
> static inline u32 iort_msi_map_rid(struct device *dev, u32 req_id)
> { return req_id; }
> static inline struct irq_domain *
> iort_get_device_domain(struct device *dev, u32 req_id) { return NULL; }
> +static inline int iort_set_fwnode(struct acpi_iort_node *iort_node,
> + struct fwnode_handle *fwnode)
> +{ return -ENODEV; }
> +static inline struct fwnode_handle *
> +iort_get_fwnode(struct acpi_iort_node *node) { return NULL; }
> #endif
>
> #define IORT_ACPI_DECLARE(name, table_id, fn) \

Reviewed-by: Hanjun Guo <hanjun.guo@linaro.org>

Thanks
Hanjun

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