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![Shiraz Saleem](/assets/img/avatar_default.png)
Combine contiguous regions of PAGE_SIZE pages into single scatter list entry while building the scatter table for a umem. This minimizes the number of the entries in the scatter list and reduces the DMA mapping overhead, particularly with the IOMMU. Set default max_seg_size in core for IB devices to 2G and do not combine if we exceed this limit. Also, purge npages in struct ib_umem as we now DMA map the umem SGL with sg_nents and npage computation is not needed. Drivers should now be using ib_umem_num_pages(), so fix the last stragglers. Move npages tracking to ib_umem_odp as ODP drivers still need it. Suggested-by: Jason Gunthorpe <jgg@ziepe.ca> Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Acked-by: Adit Ranadive <aditr@vmware.com> Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com> Tested-by: Gal Pressman <galpress@amazon.com> Tested-by: Selvin Xavier <selvin.xavier@broadcom.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
177 lines
5.3 KiB
C
177 lines
5.3 KiB
C
/*
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* Copyright (c) 2014 Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef IB_UMEM_ODP_H
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#define IB_UMEM_ODP_H
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#include <rdma/ib_umem.h>
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#include <rdma/ib_verbs.h>
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#include <linux/interval_tree.h>
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struct umem_odp_node {
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u64 __subtree_last;
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struct rb_node rb;
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};
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struct ib_umem_odp {
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struct ib_umem umem;
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struct ib_ucontext_per_mm *per_mm;
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/*
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* An array of the pages included in the on-demand paging umem.
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* Indices of pages that are currently not mapped into the device will
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* contain NULL.
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*/
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struct page **page_list;
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/*
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* An array of the same size as page_list, with DMA addresses mapped
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* for pages the pages in page_list. The lower two bits designate
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* access permissions. See ODP_READ_ALLOWED_BIT and
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* ODP_WRITE_ALLOWED_BIT.
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*/
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dma_addr_t *dma_list;
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/*
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* The umem_mutex protects the page_list and dma_list fields of an ODP
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* umem, allowing only a single thread to map/unmap pages. The mutex
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* also protects access to the mmu notifier counters.
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*/
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struct mutex umem_mutex;
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void *private; /* for the HW driver to use. */
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int notifiers_seq;
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int notifiers_count;
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int npages;
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/* Tree tracking */
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struct umem_odp_node interval_tree;
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struct completion notifier_completion;
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int dying;
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struct work_struct work;
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};
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static inline struct ib_umem_odp *to_ib_umem_odp(struct ib_umem *umem)
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{
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return container_of(umem, struct ib_umem_odp, umem);
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}
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/*
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* The lower 2 bits of the DMA address signal the R/W permissions for
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* the entry. To upgrade the permissions, provide the appropriate
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* bitmask to the map_dma_pages function.
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*
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* Be aware that upgrading a mapped address might result in change of
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* the DMA address for the page.
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*/
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#define ODP_READ_ALLOWED_BIT (1<<0ULL)
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#define ODP_WRITE_ALLOWED_BIT (1<<1ULL)
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#define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT))
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#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
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struct ib_ucontext_per_mm {
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struct ib_ucontext *context;
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struct mm_struct *mm;
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struct pid *tgid;
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bool active;
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struct rb_root_cached umem_tree;
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/* Protects umem_tree */
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struct rw_semaphore umem_rwsem;
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struct mmu_notifier mn;
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unsigned int odp_mrs_count;
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struct list_head ucontext_list;
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struct rcu_head rcu;
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};
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int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access);
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struct ib_umem_odp *ib_alloc_odp_umem(struct ib_umem_odp *root_umem,
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unsigned long addr, size_t size);
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void ib_umem_odp_release(struct ib_umem_odp *umem_odp);
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int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset,
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u64 bcnt, u64 access_mask,
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unsigned long current_seq);
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void ib_umem_odp_unmap_dma_pages(struct ib_umem_odp *umem_odp, u64 start_offset,
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u64 bound);
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typedef int (*umem_call_back)(struct ib_umem_odp *item, u64 start, u64 end,
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void *cookie);
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/*
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* Call the callback on each ib_umem in the range. Returns the logical or of
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* the return values of the functions called.
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*/
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int rbt_ib_umem_for_each_in_range(struct rb_root_cached *root,
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u64 start, u64 end,
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umem_call_back cb,
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bool blockable, void *cookie);
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/*
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* Find first region intersecting with address range.
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* Return NULL if not found
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*/
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struct ib_umem_odp *rbt_ib_umem_lookup(struct rb_root_cached *root,
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u64 addr, u64 length);
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static inline int ib_umem_mmu_notifier_retry(struct ib_umem_odp *umem_odp,
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unsigned long mmu_seq)
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{
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/*
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* This code is strongly based on the KVM code from
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* mmu_notifier_retry. Should be called with
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* the relevant locks taken (umem_odp->umem_mutex
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* and the ucontext umem_mutex semaphore locked for read).
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*/
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if (unlikely(umem_odp->notifiers_count))
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return 1;
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if (umem_odp->notifiers_seq != mmu_seq)
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return 1;
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return 0;
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}
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#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
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static inline int ib_umem_odp_get(struct ib_umem_odp *umem_odp, int access)
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{
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return -EINVAL;
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}
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static inline void ib_umem_odp_release(struct ib_umem_odp *umem_odp) {}
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#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
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#endif /* IB_UMEM_ODP_H */
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