[PATCH rfcv2 01/20] backends/iommufd: Add helpers for invalidating user-managed HWPT

[Zhenzhong Duan]

Signed-off-by: Nicolin Chen <nicol...@nvidia.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
---
 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));
+        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)"
-- 
2.34.1