RE: [PATCH v2 06/10] backends/iommufd: Introduce helper function iommufd_backend_get_device_info()

[Duan, Zhenzhong]

>-----Original Message-----
>From: Cédric Le Goater <clg@redhat.com>
>Subject: Re: [PATCH v2 06/10] backends/iommufd: Introduce helper
>function iommufd_backend_get_device_info()
>
>On 4/8/24 10:12, 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       | 23 ++++++++++++++++++++++-
>>   2 files changed, 26 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
>> index 71c53cbb45..fa1a866237 100644
>> --- a/include/sysemu/iommufd.h
>> +++ b/include/sysemu/iommufd.h
>> @@ -4,6 +4,7 @@
>>   #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"
>> @@ -34,6 +35,9 @@ 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_HIOD_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
>>   OBJECT_DECLARE_TYPE(HIODIOMMUFD, HIODIOMMUFDClass,
>HIOD_IOMMUFD)
>> diff --git a/backends/iommufd.c b/backends/iommufd.c
>> index ef8b3a808b..559affa9ec 100644
>> --- a/backends/iommufd.c
>> +++ b/backends/iommufd.c
>> @@ -20,7 +20,6 @@
>>   #include "monitor/monitor.h"
>>   #include "trace.h"
>>   #include <sys/ioctl.h>
>> -#include <linux/iommufd.h>
>>
>>   static void iommufd_backend_init(Object *obj)
>>   {
>> @@ -212,6 +211,28 @@ 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)
>> +{
>> +    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 {
>> +        *type = info.out_data_type;
>
>type should not be NULL.

Yes, will add g_assert(type);

Thanks
Zhenzhong