diff mbox series

[v4,2/5] iommu/dma: add support for non-strict mode

Message ID 1533558424-16748-3-git-send-email-thunder.leizhen@huawei.com (mailing list archive)
State New, archived
Headers show
Series add non-strict mode support for arm-smmu-v3 | expand

Commit Message

Leizhen (ThunderTown) Aug. 6, 2018, 12:27 p.m. UTC 
1. Save the related domain pointer in struct iommu_dma_cookie, make iovad
   capable call domain->ops->flush_iotlb_all to flush TLB.
2. During the iommu domain initialization phase, base on domain->non_strict
   field to check whether non-strict mode is supported or not. If so, call
   init_iova_flush_queue to register iovad->flush_cb callback.
3. All unmap(contains iova-free) APIs will finally invoke __iommu_dma_unmap
   -->iommu_dma_free_iova. If the domain is non-strict, call queue_iova to
   put off iova freeing.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
 drivers/iommu/dma-iommu.c | 23 +++++++++++++++++++++++
 drivers/iommu/iommu.c     |  1 +
 include/linux/iommu.h     |  1 +
 3 files changed, 25 insertions(+)

--
1.8.3

Comments

Robin Murphy Aug. 9, 2018, 10:46 a.m. UTC | #1 
On 06/08/18 13:27, Zhen Lei wrote:
> 1. Save the related domain pointer in struct iommu_dma_cookie, make iovad
>     capable call domain->ops->flush_iotlb_all to flush TLB.
> 2. During the iommu domain initialization phase, base on domain->non_strict
>     field to check whether non-strict mode is supported or not. If so, call
>     init_iova_flush_queue to register iovad->flush_cb callback.
> 3. All unmap(contains iova-free) APIs will finally invoke __iommu_dma_unmap
>     -->iommu_dma_free_iova. If the domain is non-strict, call queue_iova to
>     put off iova freeing.
> 
> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
> ---
>   drivers/iommu/dma-iommu.c | 23 +++++++++++++++++++++++
>   drivers/iommu/iommu.c     |  1 +
>   include/linux/iommu.h     |  1 +
>   3 files changed, 25 insertions(+)
> 
> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
> index ddcbbdb..213e62a 100644
> --- a/drivers/iommu/dma-iommu.c
> +++ b/drivers/iommu/dma-iommu.c
> @@ -55,6 +55,7 @@ struct iommu_dma_cookie {
>   	};
>   	struct list_head		msi_page_list;
>   	spinlock_t			msi_lock;
> +	struct iommu_domain		*domain;
>   };
> 
>   static inline size_t cookie_msi_granule(struct iommu_dma_cookie *cookie)
> @@ -257,6 +258,17 @@ static int iova_reserve_iommu_regions(struct device *dev,
>   	return ret;
>   }
> 
> +static void iommu_dma_flush_iotlb_all(struct iova_domain *iovad)
> +{
> +	struct iommu_dma_cookie *cookie;
> +	struct iommu_domain *domain;
> +
> +	cookie = container_of(iovad, struct iommu_dma_cookie, iovad);
> +	domain = cookie->domain;
> +
> +	domain->ops->flush_iotlb_all(domain);
> +}
> +
>   /**
>    * iommu_dma_init_domain - Initialise a DMA mapping domain
>    * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie()
> @@ -308,6 +320,14 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
>   	}
> 
>   	init_iova_domain(iovad, 1UL << order, base_pfn);
> +
> +	if (domain->non_strict) {
> +		BUG_ON(!domain->ops->flush_iotlb_all);
> +
> +		cookie->domain = domain;

cookie->domain will only be non-NULL if domain->non_strict is true...

> +		init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all, NULL);
> +	}
> +
>   	if (!dev)
>   		return 0;
> 
> @@ -390,6 +410,9 @@ static void iommu_dma_free_iova(struct iommu_dma_cookie *cookie,
>   	/* The MSI case is only ever cleaning up its most recent allocation */
>   	if (cookie->type == IOMMU_DMA_MSI_COOKIE)
>   		cookie->msi_iova -= size;
> +	else if (cookie->domain && cookie->domain->non_strict)

...so we don't need to re-check non_strict every time here.

> +		queue_iova(iovad, iova_pfn(iovad, iova),
> +				size >> iova_shift(iovad), 0);
>   	else
>   		free_iova_fast(iovad, iova_pfn(iovad, iova),
>   				size >> iova_shift(iovad));
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index 63b3756..7811fde 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -1263,6 +1263,7 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
> 
>   	domain->ops  = bus->iommu_ops;
>   	domain->type = type;
> +	domain->non_strict = 0;
>   	/* Assume all sizes by default; the driver may override this later */
>   	domain->pgsize_bitmap  = bus->iommu_ops->pgsize_bitmap;
> 
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 19938ee..0a0fb48 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -88,6 +88,7 @@ struct iommu_domain_geometry {
> 
>   struct iommu_domain {
>   	unsigned type;
> +	int non_strict;

bool?

Robin.

>   	const struct iommu_ops *ops;
>   	unsigned long pgsize_bitmap;	/* Bitmap of page sizes in use */
>   	iommu_fault_handler_t handler;
> --
> 1.8.3
> 
>
Leizhen (ThunderTown) Aug. 9, 2018, 11:01 a.m. UTC | #2 
On 2018/8/9 18:46, Robin Murphy wrote:
> On 06/08/18 13:27, Zhen Lei wrote:
>> 1. Save the related domain pointer in struct iommu_dma_cookie, make iovad
>>     capable call domain->ops->flush_iotlb_all to flush TLB.
>> 2. During the iommu domain initialization phase, base on domain->non_strict
>>     field to check whether non-strict mode is supported or not. If so, call
>>     init_iova_flush_queue to register iovad->flush_cb callback.
>> 3. All unmap(contains iova-free) APIs will finally invoke __iommu_dma_unmap
>>     -->iommu_dma_free_iova. If the domain is non-strict, call queue_iova to
>>     put off iova freeing.
>>
>> Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
>> ---
>>   drivers/iommu/dma-iommu.c | 23 +++++++++++++++++++++++
>>   drivers/iommu/iommu.c     |  1 +
>>   include/linux/iommu.h     |  1 +
>>   3 files changed, 25 insertions(+)
>>
>> diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
>> index ddcbbdb..213e62a 100644
>> --- a/drivers/iommu/dma-iommu.c
>> +++ b/drivers/iommu/dma-iommu.c
>> @@ -55,6 +55,7 @@ struct iommu_dma_cookie {
>>       };
>>       struct list_head        msi_page_list;
>>       spinlock_t            msi_lock;
>> +    struct iommu_domain        *domain;
>>   };
>>
>>   static inline size_t cookie_msi_granule(struct iommu_dma_cookie *cookie)
>> @@ -257,6 +258,17 @@ static int iova_reserve_iommu_regions(struct device *dev,
>>       return ret;
>>   }
>>
>> +static void iommu_dma_flush_iotlb_all(struct iova_domain *iovad)
>> +{
>> +    struct iommu_dma_cookie *cookie;
>> +    struct iommu_domain *domain;
>> +
>> +    cookie = container_of(iovad, struct iommu_dma_cookie, iovad);
>> +    domain = cookie->domain;
>> +
>> +    domain->ops->flush_iotlb_all(domain);
>> +}
>> +
>>   /**
>>    * iommu_dma_init_domain - Initialise a DMA mapping domain
>>    * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie()
>> @@ -308,6 +320,14 @@ int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
>>       }
>>
>>       init_iova_domain(iovad, 1UL << order, base_pfn);
>> +
>> +    if (domain->non_strict) {
>> +        BUG_ON(!domain->ops->flush_iotlb_all);
>> +
>> +        cookie->domain = domain;
> 
> cookie->domain will only be non-NULL if domain->non_strict is true...
> 
>> +        init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all, NULL);
>> +    }
>> +
>>       if (!dev)
>>           return 0;
>>
>> @@ -390,6 +410,9 @@ static void iommu_dma_free_iova(struct iommu_dma_cookie *cookie,
>>       /* The MSI case is only ever cleaning up its most recent allocation */
>>       if (cookie->type == IOMMU_DMA_MSI_COOKIE)
>>           cookie->msi_iova -= size;
>> +    else if (cookie->domain && cookie->domain->non_strict)
> 
> ...so we don't need to re-check non_strict every time here.

OK, I will change it to a comment.

> 
>> +        queue_iova(iovad, iova_pfn(iovad, iova),
>> +                size >> iova_shift(iovad), 0);
>>       else
>>           free_iova_fast(iovad, iova_pfn(iovad, iova),
>>                   size >> iova_shift(iovad));
>> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
>> index 63b3756..7811fde 100644
>> --- a/drivers/iommu/iommu.c
>> +++ b/drivers/iommu/iommu.c
>> @@ -1263,6 +1263,7 @@ static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,
>>
>>       domain->ops  = bus->iommu_ops;
>>       domain->type = type;
>> +    domain->non_strict = 0;
>>       /* Assume all sizes by default; the driver may override this later */
>>       domain->pgsize_bitmap  = bus->iommu_ops->pgsize_bitmap;
>>
>> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
>> index 19938ee..0a0fb48 100644
>> --- a/include/linux/iommu.h
>> +++ b/include/linux/iommu.h
>> @@ -88,6 +88,7 @@ struct iommu_domain_geometry {
>>
>>   struct iommu_domain {
>>       unsigned type;
>> +    int non_strict;
> 
> bool?

OK

> 
> Robin.
> 
>>       const struct iommu_ops *ops;
>>       unsigned long pgsize_bitmap;    /* Bitmap of page sizes in use */
>>       iommu_fault_handler_t handler;
>> -- 
>> 1.8.3
>>
>>
> 
> .
>
diff mbox series

Patch

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index ddcbbdb..213e62a 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -55,6 +55,7 @@  struct iommu_dma_cookie {
 	};
 	struct list_head		msi_page_list;
 	spinlock_t			msi_lock;
+	struct iommu_domain		*domain;
 };

 static inline size_t cookie_msi_granule(struct iommu_dma_cookie *cookie)
@@ -257,6 +258,17 @@  static int iova_reserve_iommu_regions(struct device *dev,
 	return ret;
 }

+static void iommu_dma_flush_iotlb_all(struct iova_domain *iovad)
+{
+	struct iommu_dma_cookie *cookie;
+	struct iommu_domain *domain;
+
+	cookie = container_of(iovad, struct iommu_dma_cookie, iovad);
+	domain = cookie->domain;
+
+	domain->ops->flush_iotlb_all(domain);
+}
+
 /**
  * iommu_dma_init_domain - Initialise a DMA mapping domain
  * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie()
@@ -308,6 +320,14 @@  int iommu_dma_init_domain(struct iommu_domain *domain, dma_addr_t base,
 	}

 	init_iova_domain(iovad, 1UL << order, base_pfn);
+
+	if (domain->non_strict) {
+		BUG_ON(!domain->ops->flush_iotlb_all);
+
+		cookie->domain = domain;
+		init_iova_flush_queue(iovad, iommu_dma_flush_iotlb_all, NULL);
+	}
+
 	if (!dev)
 		return 0;

@@ -390,6 +410,9 @@  static void iommu_dma_free_iova(struct iommu_dma_cookie *cookie,
 	/* The MSI case is only ever cleaning up its most recent allocation */
 	if (cookie->type == IOMMU_DMA_MSI_COOKIE)
 		cookie->msi_iova -= size;
+	else if (cookie->domain && cookie->domain->non_strict)
+		queue_iova(iovad, iova_pfn(iovad, iova),
+				size >> iova_shift(iovad), 0);
 	else
 		free_iova_fast(iovad, iova_pfn(iovad, iova),
 				size >> iova_shift(iovad));
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 63b3756..7811fde 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1263,6 +1263,7 @@  static struct iommu_domain *__iommu_domain_alloc(struct bus_type *bus,

 	domain->ops  = bus->iommu_ops;
 	domain->type = type;
+	domain->non_strict = 0;
 	/* Assume all sizes by default; the driver may override this later */
 	domain->pgsize_bitmap  = bus->iommu_ops->pgsize_bitmap;

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 19938ee..0a0fb48 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -88,6 +88,7 @@  struct iommu_domain_geometry {

 struct iommu_domain {
 	unsigned type;
+	int non_strict;
 	const struct iommu_ops *ops;
 	unsigned long pgsize_bitmap;	/* Bitmap of page sizes in use */
 	iommu_fault_handler_t handler;