Re: [PATCH v8 02/18] iommu: Rename iommu_dm_regions into iommu_resv_regions

[Tomasz Nowicki <tnowicki@xxxxxxxxxxxxxxxxxx>]

On 11.01.2017 10:41, Eric Auger wrote:
> We want to extend the callbacks used for dm regions and
> use them for reserved regions. Reserved regions can be
> - directly mapped regions
> - regions that cannot be iommu mapped (PCI host bridge windows, ...)
> - MSI regions (because they belong to another address space or because
>   they are not translated by the IOMMU and need special handling)
>
> So let's rename the struct and also the callbacks.
>
> Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
> Acked-by: Robin Murphy <robin.murphy@xxxxxxx>

Reviewed-by: Tomasz Nowicki <tomasz.nowicki@xxxxxxxxxxxxxxxxxx>

Thanks,
Tomasz

> ---
>
> v3 -> v4:
> - add Robin's A-b
> ---
>  drivers/iommu/amd_iommu.c | 20 ++++++++++----------
>  drivers/iommu/iommu.c     | 22 +++++++++++-----------
>  include/linux/iommu.h     | 29 +++++++++++++++--------------
>  3 files changed, 36 insertions(+), 35 deletions(-)
>
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index 3ef0f42..f7a024f 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
> @@ -3161,8 +3161,8 @@ static bool amd_iommu_capable(enum iommu_cap cap)
>  	return false;
>  }
>
> -static void amd_iommu_get_dm_regions(struct device *dev,
> -				     struct list_head *head)
> +static void amd_iommu_get_resv_regions(struct device *dev,
> +				       struct list_head *head)
>  {
>  	struct unity_map_entry *entry;
>  	int devid;
> @@ -3172,7 +3172,7 @@ static void amd_iommu_get_dm_regions(struct device *dev,
>  		return;
>
>  	list_for_each_entry(entry, &amd_iommu_unity_map, list) {
> -		struct iommu_dm_region *region;
> +		struct iommu_resv_region *region;
>
>  		if (devid < entry->devid_start || devid > entry->devid_end)
>  			continue;
> @@ -3195,18 +3195,18 @@ static void amd_iommu_get_dm_regions(struct device *dev,
>  	}
>  }
>
> -static void amd_iommu_put_dm_regions(struct device *dev,
> +static void amd_iommu_put_resv_regions(struct device *dev,
>  				     struct list_head *head)
>  {
> -	struct iommu_dm_region *entry, *next;
> +	struct iommu_resv_region *entry, *next;
>
>  	list_for_each_entry_safe(entry, next, head, list)
>  		kfree(entry);
>  }
>
> -static void amd_iommu_apply_dm_region(struct device *dev,
> +static void amd_iommu_apply_resv_region(struct device *dev,
>  				      struct iommu_domain *domain,
> -				      struct iommu_dm_region *region)
> +				      struct iommu_resv_region *region)
>  {
>  	struct dma_ops_domain *dma_dom = to_dma_ops_domain(to_pdomain(domain));
>  	unsigned long start, end;
> @@ -3230,9 +3230,9 @@ static void amd_iommu_apply_dm_region(struct device *dev,
>  	.add_device = amd_iommu_add_device,
>  	.remove_device = amd_iommu_remove_device,
>  	.device_group = amd_iommu_device_group,
> -	.get_dm_regions = amd_iommu_get_dm_regions,
> -	.put_dm_regions = amd_iommu_put_dm_regions,
> -	.apply_dm_region = amd_iommu_apply_dm_region,
> +	.get_resv_regions = amd_iommu_get_resv_regions,
> +	.put_resv_regions = amd_iommu_put_resv_regions,
> +	.apply_resv_region = amd_iommu_apply_resv_region,
>  	.pgsize_bitmap	= AMD_IOMMU_PGSIZES,
>  };
>
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index dbe7f65..1cee5c3 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -318,7 +318,7 @@ static int iommu_group_create_direct_mappings(struct iommu_group *group,
>  					      struct device *dev)
>  {
>  	struct iommu_domain *domain = group->default_domain;
> -	struct iommu_dm_region *entry;
> +	struct iommu_resv_region *entry;
>  	struct list_head mappings;
>  	unsigned long pg_size;
>  	int ret = 0;
> @@ -331,14 +331,14 @@ static int iommu_group_create_direct_mappings(struct iommu_group *group,
>  	pg_size = 1UL << __ffs(domain->pgsize_bitmap);
>  	INIT_LIST_HEAD(&mappings);
>
> -	iommu_get_dm_regions(dev, &mappings);
> +	iommu_get_resv_regions(dev, &mappings);
>
>  	/* We need to consider overlapping regions for different devices */
>  	list_for_each_entry(entry, &mappings, list) {
>  		dma_addr_t start, end, addr;
>
> -		if (domain->ops->apply_dm_region)
> -			domain->ops->apply_dm_region(dev, domain, entry);
> +		if (domain->ops->apply_resv_region)
> +			domain->ops->apply_resv_region(dev, domain, entry);
>
>  		start = ALIGN(entry->start, pg_size);
>  		end   = ALIGN(entry->start + entry->length, pg_size);
> @@ -358,7 +358,7 @@ static int iommu_group_create_direct_mappings(struct iommu_group *group,
>  	}
>
>  out:
> -	iommu_put_dm_regions(dev, &mappings);
> +	iommu_put_resv_regions(dev, &mappings);
>
>  	return ret;
>  }
> @@ -1559,20 +1559,20 @@ int iommu_domain_set_attr(struct iommu_domain *domain,
>  }
>  EXPORT_SYMBOL_GPL(iommu_domain_set_attr);
>
> -void iommu_get_dm_regions(struct device *dev, struct list_head *list)
> +void iommu_get_resv_regions(struct device *dev, struct list_head *list)
>  {
>  	const struct iommu_ops *ops = dev->bus->iommu_ops;
>
> -	if (ops && ops->get_dm_regions)
> -		ops->get_dm_regions(dev, list);
> +	if (ops && ops->get_resv_regions)
> +		ops->get_resv_regions(dev, list);
>  }
>
> -void iommu_put_dm_regions(struct device *dev, struct list_head *list)
> +void iommu_put_resv_regions(struct device *dev, struct list_head *list)
>  {
>  	const struct iommu_ops *ops = dev->bus->iommu_ops;
>
> -	if (ops && ops->put_dm_regions)
> -		ops->put_dm_regions(dev, list);
> +	if (ops && ops->put_resv_regions)
> +		ops->put_resv_regions(dev, list);
>  }
>
>  /* Request that a device is direct mapped by the IOMMU */
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 0ff5111..bfecb8b 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -118,13 +118,13 @@ enum iommu_attr {
>  };
>
>  /**
> - * struct iommu_dm_region - descriptor for a direct mapped memory region
> + * struct iommu_resv_region - descriptor for a reserved memory region
>   * @list: Linked list pointers
>   * @start: System physical start address of the region
>   * @length: Length of the region in bytes
>   * @prot: IOMMU Protection flags (READ/WRITE/...)
>   */
> -struct iommu_dm_region {
> +struct iommu_resv_region {
>  	struct list_head	list;
>  	phys_addr_t		start;
>  	size_t			length;
> @@ -150,9 +150,9 @@ struct iommu_dm_region {
>   * @device_group: find iommu group for a particular device
>   * @domain_get_attr: Query domain attributes
>   * @domain_set_attr: Change domain attributes
> - * @get_dm_regions: Request list of direct mapping requirements for a device
> - * @put_dm_regions: Free list of direct mapping requirements for a device
> - * @apply_dm_region: Temporary helper call-back for iova reserved ranges
> + * @get_resv_regions: Request list of reserved regions for a device
> + * @put_resv_regions: Free list of reserved regions for a device
> + * @apply_resv_region: Temporary helper call-back for iova reserved ranges
>   * @domain_window_enable: Configure and enable a particular window for a domain
>   * @domain_window_disable: Disable a particular window for a domain
>   * @domain_set_windows: Set the number of windows for a domain
> @@ -184,11 +184,12 @@ struct iommu_ops {
>  	int (*domain_set_attr)(struct iommu_domain *domain,
>  			       enum iommu_attr attr, void *data);
>
> -	/* Request/Free a list of direct mapping requirements for a device */
> -	void (*get_dm_regions)(struct device *dev, struct list_head *list);
> -	void (*put_dm_regions)(struct device *dev, struct list_head *list);
> -	void (*apply_dm_region)(struct device *dev, struct iommu_domain *domain,
> -				struct iommu_dm_region *region);
> +	/* Request/Free a list of reserved regions for a device */
> +	void (*get_resv_regions)(struct device *dev, struct list_head *list);
> +	void (*put_resv_regions)(struct device *dev, struct list_head *list);
> +	void (*apply_resv_region)(struct device *dev,
> +				  struct iommu_domain *domain,
> +				  struct iommu_resv_region *region);
>
>  	/* Window handling functions */
>  	int (*domain_window_enable)(struct iommu_domain *domain, u32 wnd_nr,
> @@ -233,8 +234,8 @@ extern size_t default_iommu_map_sg(struct iommu_domain *domain, unsigned long io
>  extern void iommu_set_fault_handler(struct iommu_domain *domain,
>  			iommu_fault_handler_t handler, void *token);
>
> -extern void iommu_get_dm_regions(struct device *dev, struct list_head *list);
> -extern void iommu_put_dm_regions(struct device *dev, struct list_head *list);
> +extern void iommu_get_resv_regions(struct device *dev, struct list_head *list);
> +extern void iommu_put_resv_regions(struct device *dev, struct list_head *list);
>  extern int iommu_request_dm_for_dev(struct device *dev);
>
>  extern int iommu_attach_group(struct iommu_domain *domain,
> @@ -443,12 +444,12 @@ static inline void iommu_set_fault_handler(struct iommu_domain *domain,
>  {
>  }
>
> -static inline void iommu_get_dm_regions(struct device *dev,
> +static inline void iommu_get_resv_regions(struct device *dev,
>  					struct list_head *list)
>  {
>  }
>
> -static inline void iommu_put_dm_regions(struct device *dev,
> +static inline void iommu_put_resv_regions(struct device *dev,
>  					struct list_head *list)
>  {
>  }
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