From b8abe346737215c6ee6b50c01771b4ca1746801d Mon Sep 17 00:00:00 2001 From: Mitko Haralanov Date: Fri, 5 Feb 2016 11:57:51 -0500 Subject: [PATCH] staging/hfi1: TID group definitions and support funcs Definitions and functions use to manage sets of TID/RcvArray groups. These will be used by the TID cacheline functionality coming with later patches. TID groups (or RcvArray groups) are groups of TID/RcvArray entries organized in sets of 8 and aligned on cacheline boundaries. The TID/RcvArray entries are managed in this way to make taking advantage of write-combining easier - each group is a entire cacheline. rcv_array_wc_fill() is provided to allow of generating writes to TIDs which are not currently being used in order to cause the flush of the write-combining buffer. Signed-off-by: Mitko Haralanov Reviewed-by: Ira Weiny Signed-off-by: Doug Ledford --- drivers/staging/rdma/hfi1/user_exp_rcv.c | 64 ++++++++++++++++++++++++++++++++ 1 file changed, 64 insertions(+) diff --git a/drivers/staging/rdma/hfi1/user_exp_rcv.c b/drivers/staging/rdma/hfi1/user_exp_rcv.c index bafeddf..7f15024 100644 --- a/drivers/staging/rdma/hfi1/user_exp_rcv.c +++ b/drivers/staging/rdma/hfi1/user_exp_rcv.c @@ -52,6 +52,14 @@ #include "user_exp_rcv.h" #include "trace.h" +struct tid_group { + struct list_head list; + unsigned base; + u8 size; + u8 used; + u8 map; +}; + struct mmu_rb_node { struct rb_node rbnode; unsigned long virt; @@ -75,6 +83,8 @@ static const char * const mmu_types[] = { "RANGE" }; +#define EXP_TID_SET_EMPTY(set) (set.count == 0 && list_empty(&set.list)) + static inline int mmu_addr_cmp(struct mmu_rb_node *, unsigned long, unsigned long); static struct mmu_rb_node *mmu_rb_search_by_addr(struct rb_root *, @@ -94,6 +104,43 @@ static inline void mmu_notifier_range_start(struct mmu_notifier *, struct mm_struct *, unsigned long, unsigned long); +static inline void exp_tid_group_init(struct exp_tid_set *set) +{ + INIT_LIST_HEAD(&set->list); + set->count = 0; +} + +static inline void tid_group_remove(struct tid_group *grp, + struct exp_tid_set *set) +{ + list_del_init(&grp->list); + set->count--; +} + +static inline void tid_group_add_tail(struct tid_group *grp, + struct exp_tid_set *set) +{ + list_add_tail(&grp->list, &set->list); + set->count++; +} + +static inline struct tid_group *tid_group_pop(struct exp_tid_set *set) +{ + struct tid_group *grp = + list_first_entry(&set->list, struct tid_group, list); + list_del_init(&grp->list); + set->count--; + return grp; +} + +static inline void tid_group_move(struct tid_group *group, + struct exp_tid_set *s1, + struct exp_tid_set *s2) +{ + tid_group_remove(group, s1); + tid_group_add_tail(group, s2); +} + static struct mmu_notifier_ops __maybe_unused mn_opts = { .invalidate_page = mmu_notifier_page, .invalidate_range_start = mmu_notifier_range_start, @@ -114,6 +161,23 @@ int hfi1_user_exp_rcv_free(struct hfi1_filedata *fd) return -EINVAL; } +/* + * Write an "empty" RcvArray entry. + * This function exists so the TID registaration code can use it + * to write to unused/unneeded entries and still take advantage + * of the WC performance improvements. The HFI will ignore this + * write to the RcvArray entry. + */ +static inline void rcv_array_wc_fill(struct hfi1_devdata *dd, u32 index) +{ + /* + * Doing the WC fill writes only makes sense if the device is + * present and the RcvArray has been mapped as WC memory. + */ + if ((dd->flags & HFI1_PRESENT) && dd->rcvarray_wc) + writeq(0, dd->rcvarray_wc + (index * 8)); +} + int hfi1_user_exp_rcv_setup(struct file *fp, struct hfi1_tid_info *tinfo) { return -EINVAL; -- 2.7.4