cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ib_umem_odp.h (3467B)

      1/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
      2/*
      3 * Copyright (c) 2014 Mellanox Technologies. All rights reserved.
      4 */
      5
      6#ifndef IB_UMEM_ODP_H
      7#define IB_UMEM_ODP_H
      8
      9#include <rdma/ib_umem.h>
     10#include <rdma/ib_verbs.h>
     11
     12struct ib_umem_odp {
     13	struct ib_umem umem;
     14	struct mmu_interval_notifier notifier;
     15	struct pid *tgid;
     16
     17	/* An array of the pfns included in the on-demand paging umem. */
     18	unsigned long *pfn_list;
     19
     20	/*
     21	 * An array with DMA addresses mapped for pfns in pfn_list.
     22	 * The lower two bits designate access permissions.
     23	 * See ODP_READ_ALLOWED_BIT and ODP_WRITE_ALLOWED_BIT.
     24	 */
     25	dma_addr_t		*dma_list;
     26	/*
     27	 * The umem_mutex protects the page_list and dma_list fields of an ODP
     28	 * umem, allowing only a single thread to map/unmap pages. The mutex
     29	 * also protects access to the mmu notifier counters.
     30	 */
     31	struct mutex		umem_mutex;
     32	void			*private; /* for the HW driver to use. */
     33
     34	int npages;
     35
     36	/*
     37	 * An implicit odp umem cannot be DMA mapped, has 0 length, and serves
     38	 * only as an anchor for the driver to hold onto the per_mm. FIXME:
     39	 * This should be removed and drivers should work with the per_mm
     40	 * directly.
     41	 */
     42	bool is_implicit_odp;
     43
     44	unsigned int		page_shift;
     45};
     46
     47static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)
     48{
     49	return container_of(umem, struct ib_umem_odp, umem);
     50}
     51
     52/* Returns the first page of an ODP umem. */
     53static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp)
     54{
     55	return umem_odp->notifier.interval_tree.start;
     56}
     57
     58/* Returns the address of the page after the last one of an ODP umem. */
     59static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp)
     60{
     61	return umem_odp->notifier.interval_tree.last + 1;
     62}
     63
     64static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)
     65{
     66	return (ib_umem_end(umem_odp) - ib_umem_start(umem_odp)) >>
     67	       umem_odp->page_shift;
     68}
     69
     70/*
     71 * The lower 2 bits of the DMA address signal the R/W permissions for
     72 * the entry. To upgrade the permissions, provide the appropriate
     73 * bitmask to the map_dma_pages function.
     74 *
     75 * Be aware that upgrading a mapped address might result in change of
     76 * the DMA address for the page.
     77 */
     78#define ODP_READ_ALLOWED_BIT  (1<<0ULL)
     79#define ODP_WRITE_ALLOWED_BIT (1<<1ULL)
     80
     81#define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT))
     82
     83#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
     84
     85struct ib_umem_odp *
     86ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,
     87		int access, const struct mmu_interval_notifier_ops *ops);
     88struct ib_umem_odp *ib_umem_odp_alloc_implicit(struct ib_device *device,
     89					       int access);
     90struct ib_umem_odp *
     91ib_umem_odp_alloc_child(struct ib_umem_odp *root_umem, unsigned long addr,
     92			size_t size,
     93			const struct mmu_interval_notifier_ops *ops);
     94void ib_umem_odp_release(struct ib_umem_odp *umem_odp);
     95
     96int ib_umem_odp_map_dma_and_lock(struct ib_umem_odp *umem_odp, u64 start_offset,
     97				 u64 bcnt, u64 access_mask, bool fault);
     98
     99void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset,
    100				 u64 bound);
    101
    102#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
    103
    104static inline struct ib_umem_odp *
    105ib_umem_odp_get(struct ib_device *device, unsigned long addr, size_t size,
    106		int access, const struct mmu_interval_notifier_ops *ops)
    107{
    108	return ERR_PTR(-EINVAL);
    109}
    110
    111static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {}
    112
    113#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
    114
    115#endif /* IB_UMEM_ODP_H */