/**
* init_qpn_table - initialize the QP number table for a device
* @qpt: the QPN table
*/
static int init_qpn_table(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt)
{
u32 offset, i;
struct rvt_qpn_map *map;
int ret = 0;
if (!(rdi->dparms.qpn_res_end >= rdi->dparms.qpn_res_start))
return -EINVAL;
spin_lock_init(&qpt->lock);
qpt->last = rdi->dparms.qpn_start;
qpt->incr = rdi->dparms.qpn_inc << rdi->dparms.qos_shift;
/*
* Drivers may want some QPs beyond what we need for verbs let them use
* our qpn table. No need for two. Lets go ahead and mark the bitmaps
* for those. The reserved range must be *after* the range which verbs
* will pick from.
*/
/* Figure out number of bit maps needed before reserved range */
qpt->nmaps = rdi->dparms.qpn_res_start / RVT_BITS_PER_PAGE;
/* This should always be zero */
offset = rdi->dparms.qpn_res_start & RVT_BITS_PER_PAGE_MASK;
/* Starting with the first reserved bit map */
map = &qpt->map[qpt->nmaps];
rvt_pr_info(rdi, "Reserving QPNs from 0x%x to 0x%x for non-verbs use\n",
rdi->dparms.qpn_res_start, rdi->dparms.qpn_res_end);
for (i = rdi->dparms.qpn_res_start; i <= rdi->dparms.qpn_res_end; i++) {
if (!map->page) {
get_map_page(qpt, map, GFP_KERNEL);
if (!map->page) {
ret = -ENOMEM;
break;
}
}
set_bit(offset, map->page);
offset++;
if (offset == RVT_BITS_PER_PAGE) {
/* next page */
qpt->nmaps++;
map++;
offset = 0;
}
}
return ret;
}
/**
* init_qpn_table - initialize the QP number table for a device
* @qpt: the QPN table
*/
static int init_qpn_table(struct hfi1_devdata *dd, struct hfi1_qpn_table *qpt)
{
u32 offset, qpn, i;
struct qpn_map *map;
int ret = 0;
spin_lock_init(&qpt->lock);
qpt->last = 0;
qpt->incr = 1 << dd->qos_shift;
/* insure we don't assign QPs from KDETH 64K window */
qpn = kdeth_qp << 16;
qpt->nmaps = qpn / BITS_PER_PAGE;
/* This should always be zero */
offset = qpn & BITS_PER_PAGE_MASK;
map = &qpt->map[qpt->nmaps];
dd_dev_info(dd, "Reserving QPNs for KDETH window from 0x%x to 0x%x\n",
qpn, qpn + 65535);
for (i = 0; i < 65536; i++) {
if (!map->page) {
get_map_page(qpt, map);
if (!map->page) {
ret = -ENOMEM;
break;
}
}
set_bit(offset, map->page);
offset++;
if (offset == BITS_PER_PAGE) {
/* next page */
qpt->nmaps++;
map++;
offset = 0;
}
}
return ret;
}
static int alloc_qpn(struct ipath_qp_table *qpt, enum ib_qp_type type)
{
u32 i, offset, max_scan, qpn;
struct qpn_map *map;
u32 ret = -1;
if (type == IB_QPT_SMI)
ret = 0;
else if (type == IB_QPT_GSI)
ret = 1;
if (ret != -1) {
map = &qpt->map[0];
if (unlikely(!map->page)) {
get_map_page(qpt, map);
if (unlikely(!map->page)) {
ret = -ENOMEM;
goto bail;
}
}
if (!test_and_set_bit(ret, map->page))
atomic_dec(&map->n_free);
else
ret = -EBUSY;
goto bail;
}
qpn = qpt->last + 1;
if (qpn >= QPN_MAX)
qpn = 2;
offset = qpn & BITS_PER_PAGE_MASK;
map = &qpt->map[qpn / BITS_PER_PAGE];
max_scan = qpt->nmaps - !offset;
for (i = 0;;) {
if (unlikely(!map->page)) {
get_map_page(qpt, map);
if (unlikely(!map->page))
break;
}
if (likely(atomic_read(&map->n_free))) {
do {
if (!test_and_set_bit(offset, map->page)) {
atomic_dec(&map->n_free);
qpt->last = qpn;
ret = qpn;
goto bail;
}
offset = find_next_offset(map, offset);
qpn = mk_qpn(qpt, map, offset);
/*
*/
} while (offset < BITS_PER_PAGE && qpn < QPN_MAX);
}
/*
*/
if (++i > max_scan) {
if (qpt->nmaps == QPNMAP_ENTRIES)
break;
map = &qpt->map[qpt->nmaps++];
offset = 0;
} else if (map < &qpt->map[qpt->nmaps]) {
++map;
offset = 0;
} else {
map = &qpt->map[0];
offset = 2;
}
qpn = mk_qpn(qpt, map, offset);
}
ret = -ENOMEM;
bail:
return ret;
}
/**
* alloc_qpn - Allocate the next available qpn or zero/one for QP type
* IB_QPT_SMI/IB_QPT_GSI
*@rdi: rvt device info structure
*@qpt: queue pair number table pointer
*@port_num: IB port number, 1 based, comes from core
*
* Return: The queue pair number
*/
static int alloc_qpn(struct rvt_dev_info *rdi, struct rvt_qpn_table *qpt,
enum ib_qp_type type, u8 port_num, gfp_t gfp)
{
u32 i, offset, max_scan, qpn;
struct rvt_qpn_map *map;
u32 ret;
if (rdi->driver_f.alloc_qpn)
return rdi->driver_f.alloc_qpn(rdi, qpt, type, port_num, gfp);
if (type == IB_QPT_SMI || type == IB_QPT_GSI) {
unsigned n;
ret = type == IB_QPT_GSI;
n = 1 << (ret + 2 * (port_num - 1));
spin_lock(&qpt->lock);
if (qpt->flags & n)
ret = -EINVAL;
else
qpt->flags |= n;
spin_unlock(&qpt->lock);
goto bail;
}
qpn = qpt->last + qpt->incr;
if (qpn >= RVT_QPN_MAX)
qpn = qpt->incr | ((qpt->last & 1) ^ 1);
/* offset carries bit 0 */
offset = qpn & RVT_BITS_PER_PAGE_MASK;
map = &qpt->map[qpn / RVT_BITS_PER_PAGE];
max_scan = qpt->nmaps - !offset;
for (i = 0;;) {
if (unlikely(!map->page)) {
get_map_page(qpt, map, gfp);
if (unlikely(!map->page))
break;
}
do {
if (!test_and_set_bit(offset, map->page)) {
qpt->last = qpn;
ret = qpn;
goto bail;
}
offset += qpt->incr;
/*
* This qpn might be bogus if offset >= BITS_PER_PAGE.
* That is OK. It gets re-assigned below
*/
qpn = mk_qpn(qpt, map, offset);
} while (offset < RVT_BITS_PER_PAGE && qpn < RVT_QPN_MAX);
/*
* In order to keep the number of pages allocated to a
* minimum, we scan the all existing pages before increasing
* the size of the bitmap table.
*/
if (++i > max_scan) {
if (qpt->nmaps == RVT_QPNMAP_ENTRIES)
break;
map = &qpt->map[qpt->nmaps++];
/* start at incr with current bit 0 */
offset = qpt->incr | (offset & 1);
} else if (map < &qpt->map[qpt->nmaps]) {
++map;
/* start at incr with current bit 0 */
offset = qpt->incr | (offset & 1);
} else {
map = &qpt->map[0];
/* wrap to first map page, invert bit 0 */
offset = qpt->incr | ((offset & 1) ^ 1);
}
/* there can be no bits at shift and below */
WARN_ON(offset & (rdi->dparms.qos_shift - 1));
qpn = mk_qpn(qpt, map, offset);
}
ret = -ENOMEM;
bail:
return ret;
}
static int alloc_qpn(struct ipath_qp_table *qpt, enum ib_qp_type type)
{
u32 i, offset, max_scan, qpn;
struct qpn_map *map;
u32 ret = -1;
if (type == IB_QPT_SMI)
ret = 0;
else if (type == IB_QPT_GSI)
ret = 1;
if (ret != -1) {
map = &qpt->map[0];
if (unlikely(!map->page)) {
get_map_page(qpt, map);
if (unlikely(!map->page)) {
ret = -ENOMEM;
goto bail;
}
}
if (!test_and_set_bit(ret, map->page))
atomic_dec(&map->n_free);
else
ret = -EBUSY;
goto bail;
}
qpn = qpt->last + 1;
if (qpn >= QPN_MAX)
qpn = 2;
offset = qpn & BITS_PER_PAGE_MASK;
map = &qpt->map[qpn / BITS_PER_PAGE];
max_scan = qpt->nmaps - !offset;
for (i = 0;;) {
if (unlikely(!map->page)) {
get_map_page(qpt, map);
if (unlikely(!map->page))
break;
}
if (likely(atomic_read(&map->n_free))) {
do {
if (!test_and_set_bit(offset, map->page)) {
atomic_dec(&map->n_free);
qpt->last = qpn;
ret = qpn;
goto bail;
}
offset = find_next_offset(map, offset);
qpn = mk_qpn(qpt, map, offset);
/*
* This test differs from alloc_pidmap().
* If find_next_offset() does find a zero
* bit, we don't need to check for QPN
* wrapping around past our starting QPN.
* We just need to be sure we don't loop
* forever.
*/
} while (offset < BITS_PER_PAGE && qpn < QPN_MAX);
}
/*
* In order to keep the number of pages allocated to a
* minimum, we scan the all existing pages before increasing
* the size of the bitmap table.
*/
if (++i > max_scan) {
if (qpt->nmaps == QPNMAP_ENTRIES)
break;
map = &qpt->map[qpt->nmaps++];
offset = 0;
} else if (map < &qpt->map[qpt->nmaps]) {
++map;
offset = 0;
} else {
map = &qpt->map[0];
offset = 2;
}
qpn = mk_qpn(qpt, map, offset);
}
ret = -ENOMEM;
bail:
return ret;
}
