[v3,08/19] backends/iommufd: Introduce helper function iommufd_backend_get_device_info()

Introduce a helper function iommufd_backend_get_device_info() to get
host IOMMU related information through iommufd uAPI.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/sysemu/iommufd.h |  4 ++++
 backends/iommufd.c       | 24 +++++++++++++++++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

On 4/29/24 08:50, Zhenzhong Duan wrote:
> Introduce a helper function iommufd_backend_get_device_info() to get
> host IOMMU related information through iommufd uAPI.
> 
> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
> ---
>   include/sysemu/iommufd.h |  4 ++++
>   backends/iommufd.c       | 24 +++++++++++++++++++++++-
>   2 files changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
> index 6a9fb0007a..e9593637a3 100644
> --- a/include/sysemu/iommufd.h
> +++ b/include/sysemu/iommufd.h
> @@ -17,6 +17,7 @@
>   #include "qom/object.h"
>   #include "exec/hwaddr.h"
>   #include "exec/cpu-common.h"
> +#include <linux/iommufd.h>
>   #include "sysemu/host_iommu_device.h"
>   
>   #define TYPE_IOMMUFD_BACKEND "iommufd"
> @@ -47,6 +48,9 @@ int iommufd_backend_map_dma(IOMMUFDBackend *be, uint32_t ioas_id, hwaddr iova,
>                               ram_addr_t size, void *vaddr, bool readonly);
>   int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
>                                 hwaddr iova, ram_addr_t size);
> +int iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
> +                                    enum iommu_hw_info_type *type,
> +                                    void *data, uint32_t len, Error **errp);
>   
>   #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
>   OBJECT_DECLARE_TYPE(HostIOMMUDeviceIOMMUFD, HostIOMMUDeviceIOMMUFDClass,
> diff --git a/backends/iommufd.c b/backends/iommufd.c
> index 19e46194a2..d61209788a 100644
> --- a/backends/iommufd.c
> +++ b/backends/iommufd.c
> @@ -19,7 +19,6 @@
>   #include "monitor/monitor.h"
>   #include "trace.h"
>   #include <sys/ioctl.h>
> -#include <linux/iommufd.h>
>   
>   static void iommufd_backend_init(Object *obj)
>   {
> @@ -211,6 +210,29 @@ int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
>       return ret;
>   }
>   
> +int iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
> +                                    enum iommu_hw_info_type *type,
> +                                    void *data, uint32_t len, Error **errp)

When taking an 'Error **' argument, routines preferably return a bool.

Thanks,

C.



  
> +{
> +    struct iommu_hw_info info = {
> +        .size = sizeof(info),
> +        .dev_id = devid,
> +        .data_len = len,
> +        .data_uptr = (uintptr_t)data,
> +    };
> +    int ret;
> +
> +    ret = ioctl(be->fd, IOMMU_GET_HW_INFO, &info);
> +    if (ret) {
> +        error_setg_errno(errp, errno, "Failed to get hardware info");
> +    } else {
> +        g_assert(type);
> +        *type = info.out_data_type;
> +    }
> +
> +    return ret;
> +}
> +
>   static const TypeInfo types[] = {
>       {
>           .name = TYPE_IOMMUFD_BACKEND,

>-----Original Message-----
>From: Cédric Le Goater <clg@redhat.com>
>Subject: Re: [PATCH v3 08/19] backends/iommufd: Introduce helper
>function iommufd_backend_get_device_info()
>
>On 4/29/24 08:50, Zhenzhong Duan wrote:
>> Introduce a helper function iommufd_backend_get_device_info() to get
>> host IOMMU related information through iommufd uAPI.
>>
>> Signed-off-by: Yi Liu <yi.l.liu@intel.com>
>> Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com>
>> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
>> ---
>>   include/sysemu/iommufd.h |  4 ++++
>>   backends/iommufd.c       | 24 +++++++++++++++++++++++-
>>   2 files changed, 27 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
>> index 6a9fb0007a..e9593637a3 100644
>> --- a/include/sysemu/iommufd.h
>> +++ b/include/sysemu/iommufd.h
>> @@ -17,6 +17,7 @@
>>   #include "qom/object.h"
>>   #include "exec/hwaddr.h"
>>   #include "exec/cpu-common.h"
>> +#include <linux/iommufd.h>
>>   #include "sysemu/host_iommu_device.h"
>>
>>   #define TYPE_IOMMUFD_BACKEND "iommufd"
>> @@ -47,6 +48,9 @@ int iommufd_backend_map_dma(IOMMUFDBackend
>*be, uint32_t ioas_id, hwaddr iova,
>>                               ram_addr_t size, void *vaddr, bool readonly);
>>   int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t
>ioas_id,
>>                                 hwaddr iova, ram_addr_t size);
>> +int iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t
>devid,
>> +                                    enum iommu_hw_info_type *type,
>> +                                    void *data, uint32_t len, Error **errp);
>>
>>   #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD
>TYPE_HOST_IOMMU_DEVICE "-iommufd"
>>   OBJECT_DECLARE_TYPE(HostIOMMUDeviceIOMMUFD,
>HostIOMMUDeviceIOMMUFDClass,
>> diff --git a/backends/iommufd.c b/backends/iommufd.c
>> index 19e46194a2..d61209788a 100644
>> --- a/backends/iommufd.c
>> +++ b/backends/iommufd.c
>> @@ -19,7 +19,6 @@
>>   #include "monitor/monitor.h"
>>   #include "trace.h"
>>   #include <sys/ioctl.h>
>> -#include <linux/iommufd.h>
>>
>>   static void iommufd_backend_init(Object *obj)
>>   {
>> @@ -211,6 +210,29 @@ int
>iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
>>       return ret;
>>   }
>>
>> +int iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t
>devid,
>> +                                    enum iommu_hw_info_type *type,
>> +                                    void *data, uint32_t len, Error **errp)
>
>When taking an 'Error **' argument, routines preferably return a bool.

Got it, will fix.

Thanks
Zhenzhong

>
>Thanks,
>
>C.
>
>
>
>
>> +{
>> +    struct iommu_hw_info info = {
>> +        .size = sizeof(info),
>> +        .dev_id = devid,
>> +        .data_len = len,
>> +        .data_uptr = (uintptr_t)data,
>> +    };
>> +    int ret;
>> +
>> +    ret = ioctl(be->fd, IOMMU_GET_HW_INFO, &info);
>> +    if (ret) {
>> +        error_setg_errno(errp, errno, "Failed to get hardware info");
>> +    } else {
>> +        g_assert(type);
>> +        *type = info.out_data_type;
>> +    }
>> +
>> +    return ret;
>> +}
>> +
>>   static const TypeInfo types[] = {
>>       {
>>           .name = TYPE_IOMMUFD_BACKEND,