[PATCH rfcv1 02/23] backends/iommufd: add helpers for allocating user-managed HWPT

[Zhenzhong Duan <zhenzhong.duan@intel.com>]

Include helper to allocate user-managed hwpt and helper for cache
invalidation as user-managed HWPT needs to sync cache per modifications.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 include/sysemu/iommufd.h |  7 +++++
 backends/iommufd.c       | 61 ++++++++++++++++++++++++++++++++++++++++
 backends/trace-events    |  2 ++
 3 files changed, 70 insertions(+)

diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
index 9af27ebd6c..ab6c382081 100644
--- a/include/sysemu/iommufd.h
+++ b/include/sysemu/iommufd.h
@@ -33,4 +33,11 @@ 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_alloc_hwpt(IOMMUFDBackend *be, uint32_t dev_id,
+                               uint32_t pt_id, uint32_t flags,
+                               uint32_t data_type, uint32_t data_len,
+                               void *data_ptr, uint32_t *out_hwpt);
+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);
 #endif
diff --git a/backends/iommufd.c b/backends/iommufd.c
index 1ef683c7b0..9f920e08d3 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -211,6 +211,67 @@ int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
     return ret;
 }
 
+int iommufd_backend_alloc_hwpt(IOMMUFDBackend *be, uint32_t dev_id,
+                               uint32_t pt_id, uint32_t flags,
+                               uint32_t data_type, uint32_t data_len,
+                               void *data_ptr, uint32_t *out_hwpt)
+{
+    int ret, fd = be->fd;
+    struct iommu_hwpt_alloc alloc_hwpt = {
+        .size = sizeof(struct iommu_hwpt_alloc),
+        .flags = flags,
+        .dev_id = dev_id,
+        .pt_id = pt_id,
+        .data_type = data_type,
+        .data_len = data_len,
+        .data_uptr = (uintptr_t)data_ptr,
+        .__reserved = 0,
+    };
+
+    ret = ioctl(fd, IOMMU_HWPT_ALLOC, &alloc_hwpt);
+    if (ret) {
+        ret = -errno;
+        error_report("IOMMU_HWPT_ALLOC failed: %m");
+    } else {
+        *out_hwpt = alloc_hwpt.out_hwpt_id;
+    }
+
+    trace_iommufd_backend_alloc_hwpt(fd, dev_id, pt_id, flags, data_type,
+                                     data_len, (uint64_t)data_ptr,
+                                     alloc_hwpt.out_hwpt_id, ret);
+    return ret;
+}
+
+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 const TypeInfo iommufd_backend_info = {
     .name = TYPE_IOMMUFD_BACKEND,
     .parent = TYPE_OBJECT,
diff --git a/backends/trace-events b/backends/trace-events
index d45c6e31a6..3df48bfb08 100644
--- a/backends/trace-events
+++ b/backends/trace-events
@@ -15,3 +15,5 @@ iommufd_backend_unmap_dma_non_exist(int iommufd, uint32_t ioas, uint64_t iova, u
 iommufd_backend_unmap_dma(int iommufd, uint32_t ioas, uint64_t iova, uint64_t size, int ret) " iommufd=%d ioas=%d iova=0x%"PRIx64" size=0x%"PRIx64" (%d)"
 iommufd_backend_alloc_ioas(int iommufd, uint32_t ioas, int ret) " iommufd=%d ioas=%d (%d)"
 iommufd_backend_free_id(int iommufd, uint32_t id, int ret) " iommufd=%d id=%d (%d)"
+iommufd_backend_alloc_hwpt(int iommufd, uint32_t dev_id, uint32_t pt_id, uint32_t flags, uint32_t hwpt_type, uint32_t len, uint64_t data_ptr, uint32_t out_hwpt_id, int ret) " iommufd=%d dev_id=%u pt_id=%u flags=0x%x hwpt_type=%u len=%u data_ptr=0x%"PRIx64" out_hwpt=%u (%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