blob: 80c4b6b401b83af99d8a1dde1ada784daeb8b6cb [file] [log] [blame]
/*
* Copyright(c) 2016 Intel Corporation.
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* BSD LICENSE
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* - Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <rdma/ib_umem.h>
#include <rdma/rdma_vt.h>
#include "vt.h"
#include "mr.h"
/**
* rvt_driver_mr_init - Init MR resources per driver
* @rdi: rvt dev struct
*
* Do any intilization needed when a driver registers with rdmavt.
*
* Return: 0 on success or errno on failure
*/
int rvt_driver_mr_init(struct rvt_dev_info *rdi)
{
unsigned int lkey_table_size = rdi->dparms.lkey_table_size;
unsigned lk_tab_size;
int i;
/*
* The top hfi1_lkey_table_size bits are used to index the
* table. The lower 8 bits can be owned by the user (copied from
* the LKEY). The remaining bits act as a generation number or tag.
*/
if (!lkey_table_size)
return -EINVAL;
spin_lock_init(&rdi->lkey_table.lock);
/* ensure generation is at least 4 bits */
if (lkey_table_size > RVT_MAX_LKEY_TABLE_BITS) {
rvt_pr_warn(rdi, "lkey bits %u too large, reduced to %u\n",
lkey_table_size, RVT_MAX_LKEY_TABLE_BITS);
rdi->dparms.lkey_table_size = RVT_MAX_LKEY_TABLE_BITS;
lkey_table_size = rdi->dparms.lkey_table_size;
}
rdi->lkey_table.max = 1 << lkey_table_size;
lk_tab_size = rdi->lkey_table.max * sizeof(*rdi->lkey_table.table);
rdi->lkey_table.table = (struct rvt_mregion __rcu **)
vmalloc_node(lk_tab_size, rdi->dparms.node);
if (!rdi->lkey_table.table)
return -ENOMEM;
RCU_INIT_POINTER(rdi->dma_mr, NULL);
for (i = 0; i < rdi->lkey_table.max; i++)
RCU_INIT_POINTER(rdi->lkey_table.table[i], NULL);
return 0;
}
/**
*rvt_mr_exit: clean up MR
*@rdi: rvt dev structure
*
* called when drivers have unregistered or perhaps failed to register with us
*/
void rvt_mr_exit(struct rvt_dev_info *rdi)
{
if (rdi->dma_mr)
rvt_pr_err(rdi, "DMA MR not null!\n");
vfree(rdi->lkey_table.table);
}
static void rvt_deinit_mregion(struct rvt_mregion *mr)
{
int i = mr->mapsz;
mr->mapsz = 0;
while (i)
kfree(mr->map[--i]);
}
static int rvt_init_mregion(struct rvt_mregion *mr, struct ib_pd *pd,
int count)
{
int m, i = 0;
struct rvt_dev_info *dev = ib_to_rvt(pd->device);
mr->mapsz = 0;
m = (count + RVT_SEGSZ - 1) / RVT_SEGSZ;
for (; i < m; i++) {
mr->map[i] = kzalloc_node(sizeof(*mr->map[0]), GFP_KERNEL,
dev->dparms.node);
if (!mr->map[i]) {
rvt_deinit_mregion(mr);
return -ENOMEM;
}
mr->mapsz++;
}
init_completion(&mr->comp);
/* count returning the ptr to user */
atomic_set(&mr->refcount, 1);
atomic_set(&mr->lkey_invalid, 0);
mr->pd = pd;
mr->max_segs = count;
return 0;
}
/**
* rvt_alloc_lkey - allocate an lkey
* @mr: memory region that this lkey protects
* @dma_region: 0->normal key, 1->restricted DMA key
*
* Returns 0 if successful, otherwise returns -errno.
*
* Increments mr reference count as required.
*
* Sets the lkey field mr for non-dma regions.
*
*/
static int rvt_alloc_lkey(struct rvt_mregion *mr, int dma_region)
{
unsigned long flags;
u32 r;
u32 n;
int ret = 0;
struct rvt_dev_info *dev = ib_to_rvt(mr->pd->device);
struct rvt_lkey_table *rkt = &dev->lkey_table;
rvt_get_mr(mr);
spin_lock_irqsave(&rkt->lock, flags);
/* special case for dma_mr lkey == 0 */
if (dma_region) {
struct rvt_mregion *tmr;
tmr = rcu_access_pointer(dev->dma_mr);
if (!tmr) {
rcu_assign_pointer(dev->dma_mr, mr);
mr->lkey_published = 1;
} else {
rvt_put_mr(mr);
}
goto success;
}
/* Find the next available LKEY */
r = rkt->next;
n = r;
for (;;) {
if (!rcu_access_pointer(rkt->table[r]))
break;
r = (r + 1) & (rkt->max - 1);
if (r == n)
goto bail;
}
rkt->next = (r + 1) & (rkt->max - 1);
/*
* Make sure lkey is never zero which is reserved to indicate an
* unrestricted LKEY.
*/
rkt->gen++;
/*
* bits are capped to ensure enough bits for generation number
*/
mr->lkey = (r << (32 - dev->dparms.lkey_table_size)) |
((((1 << (24 - dev->dparms.lkey_table_size)) - 1) & rkt->gen)
<< 8);
if (mr->lkey == 0) {
mr->lkey |= 1 << 8;
rkt->gen++;
}
rcu_assign_pointer(rkt->table[r], mr);
mr->lkey_published = 1;
success:
spin_unlock_irqrestore(&rkt->lock, flags);
out:
return ret;
bail:
rvt_put_mr(mr);
spin_unlock_irqrestore(&rkt->lock, flags);
ret = -ENOMEM;
goto out;
}
/**
* rvt_free_lkey - free an lkey
* @mr: mr to free from tables
*/
static void rvt_free_lkey(struct rvt_mregion *mr)
{
unsigned long flags;
u32 lkey = mr->lkey;
u32 r;
struct rvt_dev_info *dev = ib_to_rvt(mr->pd->device);
struct rvt_lkey_table *rkt = &dev->lkey_table;
int freed = 0;
spin_lock_irqsave(&rkt->lock, flags);
if (!mr->lkey_published)
goto out;
if (lkey == 0) {
RCU_INIT_POINTER(dev->dma_mr, NULL);
} else {
r = lkey >> (32 - dev->dparms.lkey_table_size);
RCU_INIT_POINTER(rkt->table[r], NULL);
}
mr->lkey_published = 0;
freed++;
out:
spin_unlock_irqrestore(&rkt->lock, flags);
if (freed) {
synchronize_rcu();
rvt_put_mr(mr);
}
}
static struct rvt_mr *__rvt_alloc_mr(int count, struct ib_pd *pd)
{
struct rvt_mr *mr;
int rval = -ENOMEM;
int m;
/* Allocate struct plus pointers to first level page tables. */
m = (count + RVT_SEGSZ - 1) / RVT_SEGSZ;
mr = kzalloc(sizeof(*mr) + m * sizeof(mr->mr.map[0]), GFP_KERNEL);
if (!mr)
goto bail;
rval = rvt_init_mregion(&mr->mr, pd, count);
if (rval)
goto bail;
/*
* ib_reg_phys_mr() will initialize mr->ibmr except for
* lkey and rkey.
*/
rval = rvt_alloc_lkey(&mr->mr, 0);
if (rval)
goto bail_mregion;
mr->ibmr.lkey = mr->mr.lkey;
mr->ibmr.rkey = mr->mr.lkey;
done:
return mr;
bail_mregion:
rvt_deinit_mregion(&mr->mr);
bail:
kfree(mr);
mr = ERR_PTR(rval);
goto done;
}
static void __rvt_free_mr(struct rvt_mr *mr)
{
rvt_deinit_mregion(&mr->mr);
rvt_free_lkey(&mr->mr);
vfree(mr);
}
/**
* rvt_get_dma_mr - get a DMA memory region
* @pd: protection domain for this memory region
* @acc: access flags
*
* Return: the memory region on success, otherwise returns an errno.
* Note that all DMA addresses should be created via the
* struct ib_dma_mapping_ops functions (see dma.c).
*/
struct ib_mr *rvt_get_dma_mr(struct ib_pd *pd, int acc)
{
struct rvt_mr *mr;
struct ib_mr *ret;
int rval;
if (ibpd_to_rvtpd(pd)->user)
return ERR_PTR(-EPERM);
mr = kzalloc(sizeof(*mr), GFP_KERNEL);
if (!mr) {
ret = ERR_PTR(-ENOMEM);
goto bail;
}
rval = rvt_init_mregion(&mr->mr, pd, 0);
if (rval) {
ret = ERR_PTR(rval);
goto bail;
}
rval = rvt_alloc_lkey(&mr->mr, 1);
if (rval) {
ret = ERR_PTR(rval);
goto bail_mregion;
}
mr->mr.access_flags = acc;
ret = &mr->ibmr;
done:
return ret;
bail_mregion:
rvt_deinit_mregion(&mr->mr);
bail:
kfree(mr);
goto done;
}
/**
* rvt_reg_user_mr - register a userspace memory region
* @pd: protection domain for this memory region
* @start: starting userspace address
* @length: length of region to register
* @mr_access_flags: access flags for this memory region
* @udata: unused by the driver
*
* Return: the memory region on success, otherwise returns an errno.
*/
struct ib_mr *rvt_reg_user_mr(struct ib_pd *pd, u64 start, u64 length,
u64 virt_addr, int mr_access_flags,
struct ib_udata *udata)
{
struct rvt_mr *mr;
struct ib_umem *umem;
struct scatterlist *sg;
int n, m, entry;
struct ib_mr *ret;
if (length == 0)
return ERR_PTR(-EINVAL);
umem = ib_umem_get(pd->uobject->context, start, length,
mr_access_flags, 0);
if (IS_ERR(umem))
return (void *)umem;
n = umem->nmap;
mr = __rvt_alloc_mr(n, pd);
if (IS_ERR(mr)) {
ret = (struct ib_mr *)mr;
goto bail_umem;
}
mr->mr.user_base = start;
mr->mr.iova = virt_addr;
mr->mr.length = length;
mr->mr.offset = ib_umem_offset(umem);
mr->mr.access_flags = mr_access_flags;
mr->umem = umem;
if (is_power_of_2(umem->page_size))
mr->mr.page_shift = ilog2(umem->page_size);
m = 0;
n = 0;
for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
void *vaddr;
vaddr = page_address(sg_page(sg));
if (!vaddr) {
ret = ERR_PTR(-EINVAL);
goto bail_inval;
}
mr->mr.map[m]->segs[n].vaddr = vaddr;
mr->mr.map[m]->segs[n].length = umem->page_size;
n++;
if (n == RVT_SEGSZ) {
m++;
n = 0;
}
}
return &mr->ibmr;
bail_inval:
__rvt_free_mr(mr);
bail_umem:
ib_umem_release(umem);
return ret;
}
/**
* rvt_dereg_mr - unregister and free a memory region
* @ibmr: the memory region to free
*
*
* Note that this is called to free MRs created by rvt_get_dma_mr()
* or rvt_reg_user_mr().
*
* Returns 0 on success.
*/
int rvt_dereg_mr(struct ib_mr *ibmr)
{
struct rvt_mr *mr = to_imr(ibmr);
struct rvt_dev_info *rdi = ib_to_rvt(ibmr->pd->device);
int ret = 0;
unsigned long timeout;
rvt_free_lkey(&mr->mr);
rvt_put_mr(&mr->mr); /* will set completion if last */
timeout = wait_for_completion_timeout(&mr->mr.comp, 5 * HZ);
if (!timeout) {
rvt_pr_err(rdi,
"rvt_dereg_mr timeout mr %p pd %p refcount %u\n",
mr, mr->mr.pd, atomic_read(&mr->mr.refcount));
rvt_get_mr(&mr->mr);
ret = -EBUSY;
goto out;
}
rvt_deinit_mregion(&mr->mr);
if (mr->umem)
ib_umem_release(mr->umem);
kfree(mr);
out:
return ret;
}
/**
* rvt_alloc_mr - Allocate a memory region usable with the
* @pd: protection domain for this memory region
* @mr_type: mem region type
* @max_num_sg: Max number of segments allowed
*
* Return: the memory region on success, otherwise return an errno.
*/
struct ib_mr *rvt_alloc_mr(struct ib_pd *pd,
enum ib_mr_type mr_type,
u32 max_num_sg)
{
struct rvt_mr *mr;
if (mr_type != IB_MR_TYPE_MEM_REG)
return ERR_PTR(-EINVAL);
mr = __rvt_alloc_mr(max_num_sg, pd);
if (IS_ERR(mr))
return (struct ib_mr *)mr;
return &mr->ibmr;
}
/**
* rvt_set_page - page assignment function called by ib_sg_to_pages
* @ibmr: memory region
* @addr: dma address of mapped page
*
* Return: 0 on success
*/
static int rvt_set_page(struct ib_mr *ibmr, u64 addr)
{
struct rvt_mr *mr = to_imr(ibmr);
u32 ps = 1 << mr->mr.page_shift;
u32 mapped_segs = mr->mr.length >> mr->mr.page_shift;
int m, n;
if (unlikely(mapped_segs == mr->mr.max_segs))
return -ENOMEM;
if (mr->mr.length == 0) {
mr->mr.user_base = addr;
mr->mr.iova = addr;
}
m = mapped_segs / RVT_SEGSZ;
n = mapped_segs % RVT_SEGSZ;
mr->mr.map[m]->segs[n].vaddr = (void *)addr;
mr->mr.map[m]->segs[n].length = ps;
mr->mr.length += ps;
return 0;
}
/**
* rvt_map_mr_sg - map sg list and set it the memory region
* @ibmr: memory region
* @sg: dma mapped scatterlist
* @sg_nents: number of entries in sg
* @sg_offset: offset in bytes into sg
*
* Return: number of sg elements mapped to the memory region
*/
int rvt_map_mr_sg(struct ib_mr *ibmr, struct scatterlist *sg,
int sg_nents, unsigned int *sg_offset)
{
struct rvt_mr *mr = to_imr(ibmr);
mr->mr.length = 0;
mr->mr.page_shift = PAGE_SHIFT;
return ib_sg_to_pages(ibmr, sg, sg_nents, sg_offset,
rvt_set_page);
}
/**
* rvt_fast_reg_mr - fast register physical MR
* @qp: the queue pair where the work request comes from
* @ibmr: the memory region to be registered
* @key: updated key for this memory region
* @access: access flags for this memory region
*
* Returns 0 on success.
*/
int rvt_fast_reg_mr(struct rvt_qp *qp, struct ib_mr *ibmr, u32 key,
int access)
{
struct rvt_mr *mr = to_imr(ibmr);
if (qp->ibqp.pd != mr->mr.pd)
return -EACCES;
/* not applicable to dma MR or user MR */
if (!mr->mr.lkey || mr->umem)
return -EINVAL;
if ((key & 0xFFFFFF00) != (mr->mr.lkey & 0xFFFFFF00))
return -EINVAL;
ibmr->lkey = key;
ibmr->rkey = key;
mr->mr.lkey = key;
mr->mr.access_flags = access;
atomic_set(&mr->mr.lkey_invalid, 0);
return 0;
}
EXPORT_SYMBOL(rvt_fast_reg_mr);
/**
* rvt_invalidate_rkey - invalidate an MR rkey
* @qp: queue pair associated with the invalidate op
* @rkey: rkey to invalidate
*
* Returns 0 on success.
*/
int rvt_invalidate_rkey(struct rvt_qp *qp, u32 rkey)
{
struct rvt_dev_info *dev = ib_to_rvt(qp->ibqp.device);
struct rvt_lkey_table *rkt = &dev->lkey_table;
struct rvt_mregion *mr;
if (rkey == 0)
return -EINVAL;
rcu_read_lock();
mr = rcu_dereference(
rkt->table[(rkey >> (32 - dev->dparms.lkey_table_size))]);
if (unlikely(!mr || mr->lkey != rkey || qp->ibqp.pd != mr->pd))
goto bail;
atomic_set(&mr->lkey_invalid, 1);
rcu_read_unlock();
return 0;
bail:
rcu_read_unlock();
return -EINVAL;
}
EXPORT_SYMBOL(rvt_invalidate_rkey);
/**
* rvt_alloc_fmr - allocate a fast memory region
* @pd: the protection domain for this memory region
* @mr_access_flags: access flags for this memory region
* @fmr_attr: fast memory region attributes
*
* Return: the memory region on success, otherwise returns an errno.
*/
struct ib_fmr *rvt_alloc_fmr(struct ib_pd *pd, int mr_access_flags,
struct ib_fmr_attr *fmr_attr)
{
struct rvt_fmr *fmr;
int m;
struct ib_fmr *ret;
int rval = -ENOMEM;
/* Allocate struct plus pointers to first level page tables. */
m = (fmr_attr->max_pages + RVT_SEGSZ - 1) / RVT_SEGSZ;
fmr = kzalloc(sizeof(*fmr) + m * sizeof(fmr->mr.map[0]), GFP_KERNEL);
if (!fmr)
goto bail;
rval = rvt_init_mregion(&fmr->mr, pd, fmr_attr->max_pages);
if (rval)
goto bail;
/*
* ib_alloc_fmr() will initialize fmr->ibfmr except for lkey &
* rkey.
*/
rval = rvt_alloc_lkey(&fmr->mr, 0);
if (rval)
goto bail_mregion;
fmr->ibfmr.rkey = fmr->mr.lkey;
fmr->ibfmr.lkey = fmr->mr.lkey;
/*
* Resources are allocated but no valid mapping (RKEY can't be
* used).
*/
fmr->mr.access_flags = mr_access_flags;
fmr->mr.max_segs = fmr_attr->max_pages;
fmr->mr.page_shift = fmr_attr->page_shift;
ret = &fmr->ibfmr;
done:
return ret;
bail_mregion:
rvt_deinit_mregion(&fmr->mr);
bail:
kfree(fmr);
ret = ERR_PTR(rval);
goto done;
}
/**
* rvt_map_phys_fmr - set up a fast memory region
* @ibmfr: the fast memory region to set up
* @page_list: the list of pages to associate with the fast memory region
* @list_len: the number of pages to associate with the fast memory region
* @iova: the virtual address of the start of the fast memory region
*
* This may be called from interrupt context.
*
* Return: 0 on success
*/
int rvt_map_phys_fmr(struct ib_fmr *ibfmr, u64 *page_list,
int list_len, u64 iova)
{
struct rvt_fmr *fmr = to_ifmr(ibfmr);
struct rvt_lkey_table *rkt;
unsigned long flags;
int m, n, i;
u32 ps;
struct rvt_dev_info *rdi = ib_to_rvt(ibfmr->device);
i = atomic_read(&fmr->mr.refcount);
if (i > 2)
return -EBUSY;
if (list_len > fmr->mr.max_segs)
return -EINVAL;
rkt = &rdi->lkey_table;
spin_lock_irqsave(&rkt->lock, flags);
fmr->mr.user_base = iova;
fmr->mr.iova = iova;
ps = 1 << fmr->mr.page_shift;
fmr->mr.length = list_len * ps;
m = 0;
n = 0;
for (i = 0; i < list_len; i++) {
fmr->mr.map[m]->segs[n].vaddr = (void *)page_list[i];
fmr->mr.map[m]->segs[n].length = ps;
if (++n == RVT_SEGSZ) {
m++;
n = 0;
}
}
spin_unlock_irqrestore(&rkt->lock, flags);
return 0;
}
/**
* rvt_unmap_fmr - unmap fast memory regions
* @fmr_list: the list of fast memory regions to unmap
*
* Return: 0 on success.
*/
int rvt_unmap_fmr(struct list_head *fmr_list)
{
struct rvt_fmr *fmr;
struct rvt_lkey_table *rkt;
unsigned long flags;
struct rvt_dev_info *rdi;
list_for_each_entry(fmr, fmr_list, ibfmr.list) {
rdi = ib_to_rvt(fmr->ibfmr.device);
rkt = &rdi->lkey_table;
spin_lock_irqsave(&rkt->lock, flags);
fmr->mr.user_base = 0;
fmr->mr.iova = 0;
fmr->mr.length = 0;
spin_unlock_irqrestore(&rkt->lock, flags);
}
return 0;
}
/**
* rvt_dealloc_fmr - deallocate a fast memory region
* @ibfmr: the fast memory region to deallocate
*
* Return: 0 on success.
*/
int rvt_dealloc_fmr(struct ib_fmr *ibfmr)
{
struct rvt_fmr *fmr = to_ifmr(ibfmr);
int ret = 0;
unsigned long timeout;
rvt_free_lkey(&fmr->mr);
rvt_put_mr(&fmr->mr); /* will set completion if last */
timeout = wait_for_completion_timeout(&fmr->mr.comp, 5 * HZ);
if (!timeout) {
rvt_get_mr(&fmr->mr);
ret = -EBUSY;
goto out;
}
rvt_deinit_mregion(&fmr->mr);
kfree(fmr);
out:
return ret;
}
/**
* rvt_lkey_ok - check IB SGE for validity and initialize
* @rkt: table containing lkey to check SGE against
* @pd: protection domain
* @isge: outgoing internal SGE
* @sge: SGE to check
* @acc: access flags
*
* Check the IB SGE for validity and initialize our internal version
* of it.
*
* Return: 1 if valid and successful, otherwise returns 0.
*
* increments the reference count upon success
*
*/
int rvt_lkey_ok(struct rvt_lkey_table *rkt, struct rvt_pd *pd,
struct rvt_sge *isge, struct ib_sge *sge, int acc)
{
struct rvt_mregion *mr;
unsigned n, m;
size_t off;
struct rvt_dev_info *dev = ib_to_rvt(pd->ibpd.device);
/*
* We use LKEY == zero for kernel virtual addresses
* (see rvt_get_dma_mr and dma.c).
*/
rcu_read_lock();
if (sge->lkey == 0) {
if (pd->user)
goto bail;
mr = rcu_dereference(dev->dma_mr);
if (!mr)
goto bail;
atomic_inc(&mr->refcount);
rcu_read_unlock();
isge->mr = mr;
isge->vaddr = (void *)sge->addr;
isge->length = sge->length;
isge->sge_length = sge->length;
isge->m = 0;
isge->n = 0;
goto ok;
}
mr = rcu_dereference(
rkt->table[(sge->lkey >> (32 - dev->dparms.lkey_table_size))]);
if (unlikely(!mr || atomic_read(&mr->lkey_invalid) ||
mr->lkey != sge->lkey || mr->pd != &pd->ibpd))
goto bail;
off = sge->addr - mr->user_base;
if (unlikely(sge->addr < mr->user_base ||
off + sge->length > mr->length ||
(mr->access_flags & acc) != acc))
goto bail;
atomic_inc(&mr->refcount);
rcu_read_unlock();
off += mr->offset;
if (mr->page_shift) {
/*
* page sizes are uniform power of 2 so no loop is necessary
* entries_spanned_by_off is the number of times the loop below
* would have executed.
*/
size_t entries_spanned_by_off;
entries_spanned_by_off = off >> mr->page_shift;
off -= (entries_spanned_by_off << mr->page_shift);
m = entries_spanned_by_off / RVT_SEGSZ;
n = entries_spanned_by_off % RVT_SEGSZ;
} else {
m = 0;
n = 0;
while (off >= mr->map[m]->segs[n].length) {
off -= mr->map[m]->segs[n].length;
n++;
if (n >= RVT_SEGSZ) {
m++;
n = 0;
}
}
}
isge->mr = mr;
isge->vaddr = mr->map[m]->segs[n].vaddr + off;
isge->length = mr->map[m]->segs[n].length - off;
isge->sge_length = sge->length;
isge->m = m;
isge->n = n;
ok:
return 1;
bail:
rcu_read_unlock();
return 0;
}
EXPORT_SYMBOL(rvt_lkey_ok);
/**
* rvt_rkey_ok - check the IB virtual address, length, and RKEY
* @qp: qp for validation
* @sge: SGE state
* @len: length of data
* @vaddr: virtual address to place data
* @rkey: rkey to check
* @acc: access flags
*
* Return: 1 if successful, otherwise 0.
*
* increments the reference count upon success
*/
int rvt_rkey_ok(struct rvt_qp *qp, struct rvt_sge *sge,
u32 len, u64 vaddr, u32 rkey, int acc)
{
struct rvt_dev_info *dev = ib_to_rvt(qp->ibqp.device);
struct rvt_lkey_table *rkt = &dev->lkey_table;
struct rvt_mregion *mr;
unsigned n, m;
size_t off;
/*
* We use RKEY == zero for kernel virtual addresses
* (see rvt_get_dma_mr and dma.c).
*/
rcu_read_lock();
if (rkey == 0) {
struct rvt_pd *pd = ibpd_to_rvtpd(qp->ibqp.pd);
struct rvt_dev_info *rdi = ib_to_rvt(pd->ibpd.device);
if (pd->user)
goto bail;
mr = rcu_dereference(rdi->dma_mr);
if (!mr)
goto bail;
atomic_inc(&mr->refcount);
rcu_read_unlock();
sge->mr = mr;
sge->vaddr = (void *)vaddr;
sge->length = len;
sge->sge_length = len;
sge->m = 0;
sge->n = 0;
goto ok;
}
mr = rcu_dereference(
rkt->table[(rkey >> (32 - dev->dparms.lkey_table_size))]);
if (unlikely(!mr || atomic_read(&mr->lkey_invalid) ||
mr->lkey != rkey || qp->ibqp.pd != mr->pd))
goto bail;
off = vaddr - mr->iova;
if (unlikely(vaddr < mr->iova || off + len > mr->length ||
(mr->access_flags & acc) == 0))
goto bail;
atomic_inc(&mr->refcount);
rcu_read_unlock();
off += mr->offset;
if (mr->page_shift) {
/*
* page sizes are uniform power of 2 so no loop is necessary
* entries_spanned_by_off is the number of times the loop below
* would have executed.
*/
size_t entries_spanned_by_off;
entries_spanned_by_off = off >> mr->page_shift;
off -= (entries_spanned_by_off << mr->page_shift);
m = entries_spanned_by_off / RVT_SEGSZ;
n = entries_spanned_by_off % RVT_SEGSZ;
} else {
m = 0;
n = 0;
while (off >= mr->map[m]->segs[n].length) {
off -= mr->map[m]->segs[n].length;
n++;
if (n >= RVT_SEGSZ) {
m++;
n = 0;
}
}
}
sge->mr = mr;
sge->vaddr = mr->map[m]->segs[n].vaddr + off;
sge->length = mr->map[m]->segs[n].length - off;
sge->sge_length = len;
sge->m = m;
sge->n = n;
ok:
return 1;
bail:
rcu_read_unlock();
return 0;
}
EXPORT_SYMBOL(rvt_rkey_ok);