Hi,
On 9/26/23 13:32, Zhenzhong Duan wrote:
> From: Eric Auger <eric.au...@redhat.com>
>
> Let the vfio-platform device use vfio_attach_device() and
> vfio_detach_device(), hence hiding the details of the used
> IOMMU backend.
>
> Drop the trace event for vfio-platform as we have similar
> one in vfio_attach_device.
>
> Signed-off-by: Eric Auger <eric.au...@redhat.com>
> Signed-off-by: Yi Liu <yi.l....@intel.com>
> Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com>
> ---
> hw/vfio/platform.c | 43 +++----------------------------------------
> hw/vfio/trace-events | 1 -
> 2 files changed, 3 insertions(+), 41 deletions(-)
>
> diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
> index 5af73f9287..8e3d4ac458 100644
> --- a/hw/vfio/platform.c
> +++ b/hw/vfio/platform.c
> @@ -529,12 +529,7 @@ static VFIODeviceOps vfio_platform_ops = {
> */
> static int vfio_base_device_init(VFIODevice *vbasedev, Error **errp)
> {
> - VFIOGroup *group;
> - VFIODevice *vbasedev_iter;
> - char *tmp, group_path[PATH_MAX], *group_name;
> - ssize_t len;
> struct stat st;
> - int groupid;
> int ret;
>
> /* @sysfsdev takes precedence over @host */
> @@ -557,47 +552,15 @@ static int vfio_base_device_init(VFIODevice *vbasedev,
> Error **errp)
> return -errno;
> }
>
> - tmp = g_strdup_printf("%s/iommu_group", vbasedev->sysfsdev);
> - len = readlink(tmp, group_path, sizeof(group_path));
> - g_free(tmp);
> -
> - if (len < 0 || len >= sizeof(group_path)) {
> - ret = len < 0 ? -errno : -ENAMETOOLONG;
> - error_setg_errno(errp, -ret, "no iommu_group found");
> - return ret;
> - }
> -
> - group_path[len] = 0;
> -
> - group_name = basename(group_path);
> - if (sscanf(group_name, "%d", &groupid) != 1) {
> - error_setg_errno(errp, errno, "failed to read %s", group_path);
> - return -errno;
> - }
> -
Here also on error path we are leaking both vbasedev->name and
vbasedev->sysfsdev. This is independent on this patch
care must be taken because vdev->vbasedev.name is used in the caller
(vfio_platform_realize) to output the error msg
deallocation could happen there?
Eric
> - trace_vfio_platform_base_device_init(vbasedev->name, groupid);
> -
> - group = vfio_get_group(groupid, &address_space_memory, errp);
> - if (!group) {
> - return -ENOENT;
> - }
> -
> - QLIST_FOREACH(vbasedev_iter, &group->device_list, next) {
> - if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) {
> - error_setg(errp, "device is already attached");
> - vfio_put_group(group);
> - return -EBUSY;
> - }
> - }
> - ret = vfio_get_device(group, vbasedev->name, vbasedev, errp);
> + ret = vfio_attach_device(vbasedev->name, vbasedev,
> + &address_space_memory, errp);
> if (ret) {
> - vfio_put_group(group);
> return ret;
> }
>
> ret = vfio_populate_device(vbasedev, errp);
> if (ret) {
> - vfio_put_group(group);
> + vfio_detach_device(vbasedev);
> }
>
> return ret;
> diff --git a/hw/vfio/trace-events b/hw/vfio/trace-events
> index e710026a73..3ac914854b 100644
> --- a/hw/vfio/trace-events
> +++ b/hw/vfio/trace-events
> @@ -120,7 +120,6 @@ vfio_get_dirty_bitmap(int fd, uint64_t iova, uint64_t
> size, uint64_t bitmap_size
> vfio_iommu_map_dirty_notify(uint64_t iova_start, uint64_t iova_end) "iommu
> dirty @ 0x%"PRIx64" - 0x%"PRIx64
>
> # platform.c
> -vfio_platform_base_device_init(char *name, int groupid) "%s belongs to group
> #%d"
> vfio_platform_realize(char *name, char *compat) "vfio device %s, compat = %s"
> vfio_platform_eoi(int pin, int fd) "EOI IRQ pin %d (fd=%d)"
> vfio_platform_intp_mmap_enable(int pin) "IRQ #%d still active, stay in slow
> path"
