From: Nicolin Chen <[email protected]> Add a backend helper to mmap hardware MMIO regions exposed via iommufd for a vIOMMU instance. This allows user space to access HW-accelerated MMIO pages provided by the vIOMMU.
The caller is responsible for unmapping the returned region. Signed-off-by: Nicolin Chen <[email protected]> Signed-off-by: Shameer Kolothum <[email protected]> --- backends/iommufd.c | 24 ++++++++++++++++++++++++ backends/trace-events | 1 + include/system/iommufd.h | 4 ++++ 3 files changed, 29 insertions(+) diff --git a/backends/iommufd.c b/backends/iommufd.c index a644763239..015e5249d6 100644 --- a/backends/iommufd.c +++ b/backends/iommufd.c @@ -575,6 +575,30 @@ bool iommufd_backend_alloc_hw_queue(IOMMUFDBackend *be, uint32_t viommu_id, return true; } +/* + * Helper to mmap HW MMIO regions exposed via iommufd for a vIOMMU instance. + * The caller is responsible for unmapping the mapped region. + */ +bool iommufd_backend_viommu_mmap(IOMMUFDBackend *be, uint32_t viommu_id, + uint64_t size, off_t offset, void **out_ptr, + Error **errp) +{ + g_assert(viommu_id); + g_assert(out_ptr); + + *out_ptr = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, be->fd, + offset); + if (*out_ptr == MAP_FAILED) { + error_setg_errno(errp, errno, "failed to mmap (size=0x%" PRIx64 + " offset=0x%" PRIx64 ") for viommu (id=%d)", + size, offset, viommu_id); + return false; + } + + trace_iommufd_backend_viommu_mmap(be->fd, viommu_id, size, offset); + return true; +} + 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 a22ad30e55..046f453caa 100644 --- a/backends/trace-events +++ b/backends/trace-events @@ -25,3 +25,4 @@ iommufd_backend_alloc_viommu(int iommufd, uint32_t dev_id, uint32_t type, uint32 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_alloc_eventq(int iommufd, uint32_t viommu_id, uint32_t type, uint32_t veventq_id, uint32_t veventq_fd, int ret) " iommufd=%d viommu_id=%u type=%u veventq_id=%u veventq_fd=%u (%d)" iommufd_backend_alloc_hw_queue(int iommufd, uint32_t viommu_id, uint32_t vqueue_type, uint32_t index, uint64_t addr, uint64_t size, uint32_t vqueue_id, int ret) " iommufd=%d viommu_id=%u vqueue_type=%u index=%u addr=0x%"PRIx64" size=0x%"PRIx64" vqueue_id=%u (%d)" +iommufd_backend_viommu_mmap(int iommufd, uint32_t viommu_id, uint64_t size, uint64_t offset) " iommufd=%d viommu_id=%u size=0x%"PRIx64" offset=0x%"PRIx64 diff --git a/include/system/iommufd.h b/include/system/iommufd.h index 9b8602a558..e3905c9a40 100644 --- a/include/system/iommufd.h +++ b/include/system/iommufd.h @@ -110,6 +110,10 @@ bool iommufd_backend_alloc_hw_queue(IOMMUFDBackend *be, uint32_t viommu_id, uint64_t addr, uint64_t length, uint32_t *out_hw_queue_id, Error **errp); +bool iommufd_backend_viommu_mmap(IOMMUFDBackend *be, uint32_t viommu_id, + uint64_t size, off_t offset, void **out_ptr, + Error **errp); + bool iommufd_backend_set_dirty_tracking(IOMMUFDBackend *be, uint32_t hwpt_id, bool start, Error **errp); bool iommufd_backend_get_dirty_bitmap(IOMMUFDBackend *be, uint32_t hwpt_id, -- 2.43.0
