diff mbox series

[v2,3/3] vfio: Create shared routine for scanning info capabilities

Message ID 1600122570-12941-4-git-send-email-mjrosato@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series s390x/pci: Accomodate vfio DMA limiting | expand

Commit Message

Matthew Rosato Sept. 14, 2020, 10:29 p.m. UTC 
Rather than duplicating the same loop in multiple locations,
create a static function to do the work.

Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
---
 hw/vfio/common.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

Comments

Philippe Mathieu-Daudé Sept. 15, 2020, 6:16 a.m. UTC | #1 
On 9/15/20 12:29 AM, Matthew Rosato wrote:
> Rather than duplicating the same loop in multiple locations,
> create a static function to do the work.

Why not do that first in your series?

> 
> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
> ---
>  hw/vfio/common.c | 33 +++++++++++++++------------------
>  1 file changed, 15 insertions(+), 18 deletions(-)
> 
> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
> index 7f4a338..bfbbfe4 100644
> --- a/hw/vfio/common.c
> +++ b/hw/vfio/common.c
> @@ -825,17 +825,12 @@ static void vfio_listener_release(VFIOContainer *container)
>      }
>  }
>  
> -struct vfio_info_cap_header *
> -vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
> +static struct vfio_info_cap_header *
> +vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id)
>  {
>      struct vfio_info_cap_header *hdr;
> -    void *ptr = info;
> -
> -    if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
> -        return NULL;
> -    }
>  
> -    for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
> +    for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
>          if (hdr->id == id) {
>              return hdr;
>          }
> @@ -844,23 +839,25 @@ vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
>      return NULL;
>  }
>  
> +
> +struct vfio_info_cap_header *
> +vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
> +{
> +    if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
> +        return NULL;
> +    }
> +
> +    return vfio_get_cap((void *)info, info->cap_offset, id);
> +}
> +
>  static struct vfio_info_cap_header *
>  vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
>  {
> -    struct vfio_info_cap_header *hdr;
> -    void *ptr = info;
> -
>      if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
>          return NULL;
>      }
>  
> -    for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
> -        if (hdr->id == id) {
> -            return hdr;
> -        }
> -    }
> -
> -    return NULL;
> +    return vfio_get_cap((void *)info, info->cap_offset, id);
>  }
>  
>  bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
>
Matthew Rosato Sept. 15, 2020, 1:43 p.m. UTC | #2 
On 9/15/20 2:16 AM, Philippe Mathieu-Daudé wrote:
> On 9/15/20 12:29 AM, Matthew Rosato wrote:
>> Rather than duplicating the same loop in multiple locations,
>> create a static function to do the work.
> 
> Why not do that first in your series?
> 

Fair question.  I did originally do this collapsing first, but I wasn't 
sure if Alex would want it so I split it out and tacked it on the end so 
it could be dropped if desired.

I'd be just fine re-arranging and putting this patch first.

>>
>> Signed-off-by: Matthew Rosato <mjrosato@linux.ibm.com>
>> ---
>>   hw/vfio/common.c | 33 +++++++++++++++------------------
>>   1 file changed, 15 insertions(+), 18 deletions(-)
>>
>> diff --git a/hw/vfio/common.c b/hw/vfio/common.c
>> index 7f4a338..bfbbfe4 100644
>> --- a/hw/vfio/common.c
>> +++ b/hw/vfio/common.c
>> @@ -825,17 +825,12 @@ static void vfio_listener_release(VFIOContainer *container)
>>       }
>>   }
>>   
>> -struct vfio_info_cap_header *
>> -vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
>> +static struct vfio_info_cap_header *
>> +vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id)
>>   {
>>       struct vfio_info_cap_header *hdr;
>> -    void *ptr = info;
>> -
>> -    if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
>> -        return NULL;
>> -    }
>>   
>> -    for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
>> +    for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
>>           if (hdr->id == id) {
>>               return hdr;
>>           }
>> @@ -844,23 +839,25 @@ vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
>>       return NULL;
>>   }
>>   
>> +
>> +struct vfio_info_cap_header *
>> +vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
>> +{
>> +    if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
>> +        return NULL;
>> +    }
>> +
>> +    return vfio_get_cap((void *)info, info->cap_offset, id);
>> +}
>> +
>>   static struct vfio_info_cap_header *
>>   vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
>>   {
>> -    struct vfio_info_cap_header *hdr;
>> -    void *ptr = info;
>> -
>>       if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
>>           return NULL;
>>       }
>>   
>> -    for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
>> -        if (hdr->id == id) {
>> -            return hdr;
>> -        }
>> -    }
>> -
>> -    return NULL;
>> +    return vfio_get_cap((void *)info, info->cap_offset, id);
>>   }
>>   
>>   bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
>>
>
diff mbox series

Patch

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 7f4a338..bfbbfe4 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -825,17 +825,12 @@  static void vfio_listener_release(VFIOContainer *container)
     }
 }
 
-struct vfio_info_cap_header *
-vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
+static struct vfio_info_cap_header *
+vfio_get_cap(void *ptr, uint32_t cap_offset, uint16_t id)
 {
     struct vfio_info_cap_header *hdr;
-    void *ptr = info;
-
-    if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
-        return NULL;
-    }
 
-    for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
+    for (hdr = ptr + cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
         if (hdr->id == id) {
             return hdr;
         }
@@ -844,23 +839,25 @@  vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
     return NULL;
 }
 
+
+struct vfio_info_cap_header *
+vfio_get_region_info_cap(struct vfio_region_info *info, uint16_t id)
+{
+    if (!(info->flags & VFIO_REGION_INFO_FLAG_CAPS)) {
+        return NULL;
+    }
+
+    return vfio_get_cap((void *)info, info->cap_offset, id);
+}
+
 static struct vfio_info_cap_header *
 vfio_get_iommu_type1_info_cap(struct vfio_iommu_type1_info *info, uint16_t id)
 {
-    struct vfio_info_cap_header *hdr;
-    void *ptr = info;
-
     if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) {
         return NULL;
     }
 
-    for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) {
-        if (hdr->id == id) {
-            return hdr;
-        }
-    }
-
-    return NULL;
+    return vfio_get_cap((void *)info, info->cap_offset, id);
 }
 
 bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,