qemu/backends-iommufd-Introduce-iommufd_viommu_invalidate.patch

From 2be28f75e4ed2a0a35549dd1a545e0655e63973d Mon Sep 17 00:00:00 2001
From: Nicolin Chen <nicolinc@nvidia.com>
Date: Fri, 12 Apr 2024 23:27:54 +0000
Subject: [PATCH] backends/iommufd: Introduce iommufd_viommu_invalidate_cache

Similar to iommufd_backend_invalidate_cache for iotlb invalidation via
IOMMU_HWPT_INVALIDATE ioctl, add a new helper for viommu specific cache
invalidation via IOMMU_VIOMMU_INVALIDATE ioctl.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 backends/iommufd.c       | 31 +++++++++++++++++++++++++++++++
 backends/trace-events    |  1 +
 include/sysemu/iommufd.h |  3 +++
 3 files changed, 35 insertions(+)

diff --git a/backends/iommufd.c b/backends/iommufd.c
index af3376d0bf..ee6f5bcf65 100644
--- a/backends/iommufd.c
+++ b/backends/iommufd.c
@@ -426,6 +426,37 @@ struct IOMMUFDVdev *iommufd_backend_alloc_vdev(HostIOMMUDeviceIOMMUFD *idev,
     return vdev;
 }
 
+int iommufd_viommu_invalidate_cache(IOMMUFDBackend *be, uint32_t viommu_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 = viommu_id,
+        .data_type = data_type,
+        .entry_len = entry_len,
+        .entry_num = *entry_num,
+        .data_uptr = (uint64_t)data_ptr,
+    };
+
+    ret = ioctl(fd, IOMMU_HWPT_INVALIDATE, &cache);
+
+    trace_iommufd_viommu_invalidate_cache(fd, viommu_id, data_type,
+                                          entry_len, *entry_num,
+                                          cache.entry_num,
+                                          (uint64_t)data_ptr, ret);
+    if (ret) {
+        *entry_num = cache.entry_num;
+        error_report("IOMMU_VIOMMU_INVALIDATE failed: %s", strerror(errno));
+        ret = -errno;
+    } else {
+        g_assert(*entry_num == cache.entry_num);
+    }
+
+    return ret;
+}
+
 bool host_iommu_device_iommufd_attach_hwpt(HostIOMMUDeviceIOMMUFD *idev,
                                            uint32_t hwpt_id, Error **errp)
 {
diff --git a/backends/trace-events b/backends/trace-events
index e150a37e9a..f8592a2711 100644
--- a/backends/trace-events
+++ b/backends/trace-events
@@ -21,3 +21,4 @@ iommufd_backend_get_dirty_bitmap(int iommufd, uint32_t hwpt_id, uint64_t iova, u
 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)"
 iommufd_backend_alloc_viommu(int iommufd, uint32_t type, uint32_t dev_id, uint32_t hwpt_id, uint32_t viommu_id, int ret) " iommufd=%d type=%u dev_id=%u hwpt_id=%u viommu_id=%u (%d)"
 iommufd_backend_alloc_vdev(int iommufd, uint32_t dev_id, uint32_t viommu_id, uint64_t virt_id, uint32_t vdev_id, int ret) " iommufd=%d dev_id=%u viommu_id=%u virt_id=0x%"PRIx64" vdev_id=%u (%d)"
+iommufd_viommu_invalidate_cache(int iommufd, uint32_t viommu_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 viommu_id=%u data_type=%u entry_len=%u entry_num=%u done_num=%u data_ptr=0x%"PRIx64" (%d)"
diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
index 0284e95460..0f2c826036 100644
--- a/include/sysemu/iommufd.h
+++ b/include/sysemu/iommufd.h
@@ -76,6 +76,9 @@ struct IOMMUFDViommu *iommufd_backend_alloc_viommu(IOMMUFDBackend *be,
                                                    uint32_t dev_id,
                                                    uint32_t viommu_type,
                                                    uint32_t hwpt_id);
+int iommufd_viommu_invalidate_cache(IOMMUFDBackend *be, uint32_t viommu_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"
 OBJECT_DECLARE_TYPE(HostIOMMUDeviceIOMMUFD, HostIOMMUDeviceIOMMUFDClass,
-- 
2.41.0.windows.1