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5a905e33b2
'struct mmu_rb_ops' is not modified in this driver. Constifying this structure moves some data to a read-only section, so increase overall security. On a x86_64, with allmodconfig, as an example: Before: ====== text data bss dec hex filename 10879 164 0 11043 2b23 drivers/infiniband/hw/hfi1/pin_system.o After: ===== text data bss dec hex filename 10907 140 0 11047 2b27 drivers/infiniband/hw/hfi1/pin_system.o Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Link: https://lore.kernel.org/r/b826dd05eefa5f4d6a7a1b4d191eaf37c714ed04.1719259997.git.christophe.jaillet@wanadoo.fr Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
67 lines
2 KiB
C
67 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
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/*
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* Copyright(c) 2020 Cornelis Networks, Inc.
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* Copyright(c) 2016 Intel Corporation.
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*/
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#ifndef _HFI1_MMU_RB_H
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#define _HFI1_MMU_RB_H
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#include "hfi.h"
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struct mmu_rb_node {
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unsigned long addr;
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unsigned long len;
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unsigned long __last;
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struct rb_node node;
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struct mmu_rb_handler *handler;
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struct list_head list;
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struct kref refcount;
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};
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/* filter and evict must not sleep. Only remove is allowed to sleep. */
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struct mmu_rb_ops {
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bool (*filter)(struct mmu_rb_node *node, unsigned long addr,
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unsigned long len);
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void (*remove)(void *ops_arg, struct mmu_rb_node *mnode);
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int (*evict)(void *ops_arg, struct mmu_rb_node *mnode,
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void *evict_arg, bool *stop);
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};
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struct mmu_rb_handler {
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/*
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* struct mmu_notifier is 56 bytes, and spinlock_t is 4 bytes, so
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* they fit together in one cache line. mn is relatively rarely
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* accessed, so co-locating the spinlock with it achieves much of
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* the cacheline contention reduction of giving the spinlock its own
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* cacheline without the overhead of doing so.
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*/
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struct mmu_notifier mn;
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spinlock_t lock; /* protect the RB tree */
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/* Begin on a new cachline boundary here */
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struct rb_root_cached root ____cacheline_aligned_in_smp;
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void *ops_arg;
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const struct mmu_rb_ops *ops;
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struct list_head lru_list;
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struct work_struct del_work;
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struct list_head del_list;
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struct workqueue_struct *wq;
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void *free_ptr;
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};
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int hfi1_mmu_rb_register(void *ops_arg,
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const struct mmu_rb_ops *ops,
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struct workqueue_struct *wq,
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struct mmu_rb_handler **handler);
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void hfi1_mmu_rb_unregister(struct mmu_rb_handler *handler);
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int hfi1_mmu_rb_insert(struct mmu_rb_handler *handler,
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struct mmu_rb_node *mnode);
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void hfi1_mmu_rb_release(struct kref *refcount);
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void hfi1_mmu_rb_evict(struct mmu_rb_handler *handler, void *evict_arg);
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struct mmu_rb_node *hfi1_mmu_rb_get_first(struct mmu_rb_handler *handler,
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unsigned long addr,
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unsigned long len);
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#endif /* _HFI1_MMU_RB_H */
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