Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

[linux-2.6-microblaze.git] / drivers / vdpa / vdpa_user / iova_domain.h

diff --git a/drivers/vdpa/vdpa_user/iova_domain.h b/drivers/vdpa/vdpa_user/iova_domain.h
new file mode 100644 (file)
index 0000000..2722d9b
--- /dev/null
+++ b/drivers/vdpa/vdpa_user/iova_domain.h
@@ -0,0 +1,73 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * MMU-based software IOTLB.
+ *
+ * Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All rights reserved.
+ *
+ * Author: Xie Yongji <xieyongji@bytedance.com>
+ *
+ */
+
+#ifndef _VDUSE_IOVA_DOMAIN_H
+#define _VDUSE_IOVA_DOMAIN_H
+
+#include <linux/iova.h>
+#include <linux/dma-mapping.h>
+#include <linux/vhost_iotlb.h>
+
+#define IOVA_START_PFN 1
+
+#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
+
+struct vduse_bounce_map {
+       struct page *bounce_page;
+       u64 orig_phys;
+};
+
+struct vduse_iova_domain {
+       struct iova_domain stream_iovad;
+       struct iova_domain consistent_iovad;
+       struct vduse_bounce_map *bounce_maps;
+       size_t bounce_size;
+       unsigned long iova_limit;
+       int bounce_map;
+       struct vhost_iotlb *iotlb;
+       spinlock_t iotlb_lock;
+       struct file *file;
+};
+
+int vduse_domain_set_map(struct vduse_iova_domain *domain,
+                        struct vhost_iotlb *iotlb);
+
+void vduse_domain_clear_map(struct vduse_iova_domain *domain,
+                           struct vhost_iotlb *iotlb);
+
+dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain,
+                                struct page *page, unsigned long offset,
+                                size_t size, enum dma_data_direction dir,
+                                unsigned long attrs);
+
+void vduse_domain_unmap_page(struct vduse_iova_domain *domain,
+                            dma_addr_t dma_addr, size_t size,
+                            enum dma_data_direction dir, unsigned long attrs);
+
+void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain,
+                                 size_t size, dma_addr_t *dma_addr,
+                                 gfp_t flag, unsigned long attrs);
+
+void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size,
+                               void *vaddr, dma_addr_t dma_addr,
+                               unsigned long attrs);
+
+void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain);
+
+void vduse_domain_destroy(struct vduse_iova_domain *domain);
+
+struct vduse_iova_domain *vduse_domain_create(unsigned long iova_limit,
+                                             size_t bounce_size);
+
+int vduse_domain_init(void);
+
+void vduse_domain_exit(void);
+
+#endif /* _VDUSE_IOVA_DOMAIN_H */