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Commit b8abe346 authored by Mitko Haralanov's avatar Mitko Haralanov Committed by Doug Ledford
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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: default avatarMitko Haralanov <mitko.haralanov@intel.com>
Reviewed-by: default avatarIra Weiny <ira.weiny@intel.com>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent acac10fd

drivers/staging/rdma/hfi1/user_exp_rcv.c

+64 −0
Original line number Original line Diff line number Diff line
@@ -52,6 +52,14 @@ 
#include "user_exp_rcv.h"

#include "user_exp_rcv.h"

#include "trace.h"

#include "trace.h"





struct tid_group {

	struct list_head list;

	unsigned base;

	u8 size;

	u8 used;

	u8 map;

};



struct mmu_rb_node {

struct mmu_rb_node {

	struct rb_node rbnode;

	struct rb_node rbnode;

	unsigned long virt;

	unsigned long virt;
@@ -75,6 +83,8 @@ static const char * const mmu_types[] = { 
	"RANGE"

	"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,

static inline int mmu_addr_cmp(struct mmu_rb_node *, unsigned long,

			       unsigned long);

			       unsigned long);

static struct mmu_rb_node *mmu_rb_search_by_addr(struct rb_root *,

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 *,

					    struct mm_struct *,

					    unsigned long, unsigned long);

					    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 = {

static struct mmu_notifier_ops __maybe_unused mn_opts = {

	.invalidate_page = mmu_notifier_page,

	.invalidate_page = mmu_notifier_page,

	.invalidate_range_start = mmu_notifier_range_start,

	.invalidate_range_start = mmu_notifier_range_start,
@@ -114,6 +161,23 @@ int hfi1_user_exp_rcv_free(struct hfi1_filedata *fd) 
	return -EINVAL;

	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)

int hfi1_user_exp_rcv_setup(struct file *fp, struct hfi1_tid_info *tinfo)

{

{

	return -EINVAL;

	return -EINVAL;