Hi Eric,
>-----Original Message-----
>From: Eric Auger <eric.au...@redhat.com>
>Subject: Re: [PATCH rfcv2 01/20] backends/iommufd: Add helpers for invalidating
>user-managed HWPT
>
>Hi Zhenzhong,
>
>
>On 2/19/25 9:22 AM, Zhenzhong Duan wrote:
>> Signed-off-by: Nicolin Chen <nicol...@nvidia.com>
>> Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
>in the title, there is only a single helper here. a small commit msg may
>help the reader
Sure, will do.
>> ---
>> include/system/iommufd.h | 3 +++
>> backends/iommufd.c | 30 ++++++++++++++++++++++++++++++
>> backends/trace-events | 1 +
>> 3 files changed, 34 insertions(+)
>>
>> diff --git a/include/system/iommufd.h b/include/system/iommufd.h
>> index cbab75bfbf..5d02e9d148 100644
>> --- a/include/system/iommufd.h
>> +++ b/include/system/iommufd.h
>> @@ -61,6 +61,9 @@ bool
>iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id,
>> uint64_t iova, ram_addr_t size,
>> uint64_t page_size, uint64_t *data,
>> Error **errp);
>> +int iommufd_backend_invalidate_cache(IOMMUFDBackend *be, uint32_t
>hwpt_id,
>> + uint32_t data_type, uint32_t entry_len,
>> + uint32_t *entry_num, void *data_ptr);
>>
>> #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD
>TYPE_HOST_IOMMU_DEVICE "-iommufd"
>> #endif
>> diff --git a/backends/iommufd.c b/backends/iommufd.c
>> index d57da44755..fc32aad5cb 100644
>> --- a/backends/iommufd.c
>> +++ b/backends/iommufd.c
>> @@ -311,6 +311,36 @@ bool
>iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
>> return true;
>> }
>>
>> +int iommufd_backend_invalidate_cache(IOMMUFDBackend *be, uint32_t
>hwpt_id,
>> + uint32_t data_type, uint32_t entry_len,
>> + uint32_t *entry_num, void *data_ptr)
>> +{
>> + int ret, fd = be->fd;
>> + struct iommu_hwpt_invalidate cache = {
>> + .size = sizeof(cache),
>> + .hwpt_id = hwpt_id,
>> + .data_type = data_type,
>> + .entry_len = entry_len,
>> + .entry_num = *entry_num,
>> + .data_uptr = (uintptr_t)data_ptr,
>> + };
>> +
>> + ret = ioctl(fd, IOMMU_HWPT_INVALIDATE, &cache);
>> +
>> + trace_iommufd_backend_invalidate_cache(fd, hwpt_id, data_type,
>entry_len,
>> + *entry_num, cache.entry_num,
>> + (uintptr_t)data_ptr, ret);
>> + if (ret) {
>> + *entry_num = cache.entry_num;
>> + error_report("IOMMU_HWPT_INVALIDATE failed: %s", strerror(errno));
>nit: you may report *entry_num also.
>Wouldn't it be useful to have an Error *errp passed to the function
Will do.
Thanks
Zhenzhong
>> + ret = -errno;
>> + } else {
>> + g_assert(*entry_num == cache.entry_num);
>> + }
>> +
>> + return ret;
>> +}
>> +
>> static int hiod_iommufd_get_cap(HostIOMMUDevice *hiod, int cap, Error
>**errp)
>> {
>> HostIOMMUDeviceCaps *caps = &hiod->caps;
>> diff --git a/backends/trace-events b/backends/trace-events
>> index 40811a3162..5a23db6c8a 100644
>> --- a/backends/trace-events
>> +++ b/backends/trace-events
>> @@ -18,3 +18,4 @@ iommufd_backend_alloc_hwpt(int iommufd, uint32_t
>dev_id, uint32_t pt_id, uint32_
>> iommufd_backend_free_id(int iommufd, uint32_t id, int ret) " iommufd=%d
>id=%d (%d)"
>> iommufd_backend_set_dirty(int iommufd, uint32_t hwpt_id, bool start, int
>> ret)
>" iommufd=%d hwpt=%u enable=%d (%d)"
>> iommufd_backend_get_dirty_bitmap(int iommufd, uint32_t hwpt_id, uint64_t
>iova, uint64_t size, uint64_t page_size, int ret) " iommufd=%d hwpt=%u
>iova=0x%"PRIx64" size=0x%"PRIx64" page_size=0x%"PRIx64" (%d)"
>> +iommufd_backend_invalidate_cache(int iommufd, uint32_t hwpt_id, uint32_t
>data_type, uint32_t entry_len, uint32_t entry_num, uint32_t done_num, uint64_t
>data_ptr, int ret) " iommufd=%d hwpt_id=%u data_type=%u entry_len=%u
>entry_num=%u done_num=%u data_ptr=0x%"PRIx64" (%d)"
>Eric
