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linux-next/drivers/infiniband/hw/ehca/ehca_cq.c
Hoang-Nam Nguyen ce29d72cc7 IB/ehca: Fix improper use of yield() with spinlock held
Signed-off-by: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
2007-01-22 17:03:55 -08:00

431 lines
12 KiB
C

/*
* IBM eServer eHCA Infiniband device driver for Linux on POWER
*
* Completion queue handling
*
* Authors: Waleri Fomin <fomin@de.ibm.com>
* Khadija Souissi <souissi@de.ibm.com>
* Reinhard Ernst <rernst@de.ibm.com>
* Heiko J Schick <schickhj@de.ibm.com>
* Hoang-Nam Nguyen <hnguyen@de.ibm.com>
*
*
* Copyright (c) 2005 IBM Corporation
*
* All rights reserved.
*
* This source code is distributed under a dual license of GPL v2.0 and OpenIB
* BSD.
*
* OpenIB 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.
*
* 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 <asm/current.h>
#include "ehca_iverbs.h"
#include "ehca_classes.h"
#include "ehca_irq.h"
#include "hcp_if.h"
static struct kmem_cache *cq_cache;
int ehca_cq_assign_qp(struct ehca_cq *cq, struct ehca_qp *qp)
{
unsigned int qp_num = qp->real_qp_num;
unsigned int key = qp_num & (QP_HASHTAB_LEN-1);
unsigned long spl_flags;
spin_lock_irqsave(&cq->spinlock, spl_flags);
hlist_add_head(&qp->list_entries, &cq->qp_hashtab[key]);
spin_unlock_irqrestore(&cq->spinlock, spl_flags);
ehca_dbg(cq->ib_cq.device, "cq_num=%x real_qp_num=%x",
cq->cq_number, qp_num);
return 0;
}
int ehca_cq_unassign_qp(struct ehca_cq *cq, unsigned int real_qp_num)
{
int ret = -EINVAL;
unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
struct hlist_node *iter;
struct ehca_qp *qp;
unsigned long spl_flags;
spin_lock_irqsave(&cq->spinlock, spl_flags);
hlist_for_each(iter, &cq->qp_hashtab[key]) {
qp = hlist_entry(iter, struct ehca_qp, list_entries);
if (qp->real_qp_num == real_qp_num) {
hlist_del(iter);
ehca_dbg(cq->ib_cq.device,
"removed qp from cq .cq_num=%x real_qp_num=%x",
cq->cq_number, real_qp_num);
ret = 0;
break;
}
}
spin_unlock_irqrestore(&cq->spinlock, spl_flags);
if (ret)
ehca_err(cq->ib_cq.device,
"qp not found cq_num=%x real_qp_num=%x",
cq->cq_number, real_qp_num);
return ret;
}
struct ehca_qp* ehca_cq_get_qp(struct ehca_cq *cq, int real_qp_num)
{
struct ehca_qp *ret = NULL;
unsigned int key = real_qp_num & (QP_HASHTAB_LEN-1);
struct hlist_node *iter;
struct ehca_qp *qp;
hlist_for_each(iter, &cq->qp_hashtab[key]) {
qp = hlist_entry(iter, struct ehca_qp, list_entries);
if (qp->real_qp_num == real_qp_num) {
ret = qp;
break;
}
}
return ret;
}
struct ib_cq *ehca_create_cq(struct ib_device *device, int cqe,
struct ib_ucontext *context,
struct ib_udata *udata)
{
static const u32 additional_cqe = 20;
struct ib_cq *cq;
struct ehca_cq *my_cq;
struct ehca_shca *shca =
container_of(device, struct ehca_shca, ib_device);
struct ipz_adapter_handle adapter_handle;
struct ehca_alloc_cq_parms param; /* h_call's out parameters */
struct h_galpa gal;
void *vpage;
u32 counter;
u64 rpage, cqx_fec, h_ret;
int ipz_rc, ret, i;
unsigned long flags;
if (cqe >= 0xFFFFFFFF - 64 - additional_cqe)
return ERR_PTR(-EINVAL);
my_cq = kmem_cache_alloc(cq_cache, GFP_KERNEL);
if (!my_cq) {
ehca_err(device, "Out of memory for ehca_cq struct device=%p",
device);
return ERR_PTR(-ENOMEM);
}
memset(my_cq, 0, sizeof(struct ehca_cq));
memset(&param, 0, sizeof(struct ehca_alloc_cq_parms));
spin_lock_init(&my_cq->spinlock);
spin_lock_init(&my_cq->cb_lock);
spin_lock_init(&my_cq->task_lock);
my_cq->ownpid = current->tgid;
cq = &my_cq->ib_cq;
adapter_handle = shca->ipz_hca_handle;
param.eq_handle = shca->eq.ipz_eq_handle;
do {
if (!idr_pre_get(&ehca_cq_idr, GFP_KERNEL)) {
cq = ERR_PTR(-ENOMEM);
ehca_err(device, "Can't reserve idr nr. device=%p",
device);
goto create_cq_exit1;
}
spin_lock_irqsave(&ehca_cq_idr_lock, flags);
ret = idr_get_new(&ehca_cq_idr, my_cq, &my_cq->token);
spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
} while (ret == -EAGAIN);
if (ret) {
cq = ERR_PTR(-ENOMEM);
ehca_err(device, "Can't allocate new idr entry. device=%p",
device);
goto create_cq_exit1;
}
/*
* CQs maximum depth is 4GB-64, but we need additional 20 as buffer
* for receiving errors CQEs.
*/
param.nr_cqe = cqe + additional_cqe;
h_ret = hipz_h_alloc_resource_cq(adapter_handle, my_cq, &param);
if (h_ret != H_SUCCESS) {
ehca_err(device, "hipz_h_alloc_resource_cq() failed "
"h_ret=%lx device=%p", h_ret, device);
cq = ERR_PTR(ehca2ib_return_code(h_ret));
goto create_cq_exit2;
}
ipz_rc = ipz_queue_ctor(&my_cq->ipz_queue, param.act_pages,
EHCA_PAGESIZE, sizeof(struct ehca_cqe), 0);
if (!ipz_rc) {
ehca_err(device, "ipz_queue_ctor() failed ipz_rc=%x device=%p",
ipz_rc, device);
cq = ERR_PTR(-EINVAL);
goto create_cq_exit3;
}
for (counter = 0; counter < param.act_pages; counter++) {
vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
if (!vpage) {
ehca_err(device, "ipz_qpageit_get_inc() "
"returns NULL device=%p", device);
cq = ERR_PTR(-EAGAIN);
goto create_cq_exit4;
}
rpage = virt_to_abs(vpage);
h_ret = hipz_h_register_rpage_cq(adapter_handle,
my_cq->ipz_cq_handle,
&my_cq->pf,
0,
0,
rpage,
1,
my_cq->galpas.
kernel);
if (h_ret < H_SUCCESS) {
ehca_err(device, "hipz_h_register_rpage_cq() failed "
"ehca_cq=%p cq_num=%x h_ret=%lx counter=%i "
"act_pages=%i", my_cq, my_cq->cq_number,
h_ret, counter, param.act_pages);
cq = ERR_PTR(-EINVAL);
goto create_cq_exit4;
}
if (counter == (param.act_pages - 1)) {
vpage = ipz_qpageit_get_inc(&my_cq->ipz_queue);
if ((h_ret != H_SUCCESS) || vpage) {
ehca_err(device, "Registration of pages not "
"complete ehca_cq=%p cq_num=%x "
"h_ret=%lx", my_cq, my_cq->cq_number,
h_ret);
cq = ERR_PTR(-EAGAIN);
goto create_cq_exit4;
}
} else {
if (h_ret != H_PAGE_REGISTERED) {
ehca_err(device, "Registration of page failed "
"ehca_cq=%p cq_num=%x h_ret=%lx"
"counter=%i act_pages=%i",
my_cq, my_cq->cq_number,
h_ret, counter, param.act_pages);
cq = ERR_PTR(-ENOMEM);
goto create_cq_exit4;
}
}
}
ipz_qeit_reset(&my_cq->ipz_queue);
gal = my_cq->galpas.kernel;
cqx_fec = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_fec));
ehca_dbg(device, "ehca_cq=%p cq_num=%x CQX_FEC=%lx",
my_cq, my_cq->cq_number, cqx_fec);
my_cq->ib_cq.cqe = my_cq->nr_of_entries =
param.act_nr_of_entries - additional_cqe;
my_cq->cq_number = (my_cq->ipz_cq_handle.handle) & 0xffff;
for (i = 0; i < QP_HASHTAB_LEN; i++)
INIT_HLIST_HEAD(&my_cq->qp_hashtab[i]);
if (context) {
struct ipz_queue *ipz_queue = &my_cq->ipz_queue;
struct ehca_create_cq_resp resp;
struct vm_area_struct *vma;
memset(&resp, 0, sizeof(resp));
resp.cq_number = my_cq->cq_number;
resp.token = my_cq->token;
resp.ipz_queue.qe_size = ipz_queue->qe_size;
resp.ipz_queue.act_nr_of_sg = ipz_queue->act_nr_of_sg;
resp.ipz_queue.queue_length = ipz_queue->queue_length;
resp.ipz_queue.pagesize = ipz_queue->pagesize;
resp.ipz_queue.toggle_state = ipz_queue->toggle_state;
ret = ehca_mmap_nopage(((u64)(my_cq->token) << 32) | 0x12000000,
ipz_queue->queue_length,
(void**)&resp.ipz_queue.queue,
&vma);
if (ret) {
ehca_err(device, "Could not mmap queue pages");
cq = ERR_PTR(ret);
goto create_cq_exit4;
}
my_cq->uspace_queue = resp.ipz_queue.queue;
resp.galpas = my_cq->galpas;
ret = ehca_mmap_register(my_cq->galpas.user.fw_handle,
(void**)&resp.galpas.kernel.fw_handle,
&vma);
if (ret) {
ehca_err(device, "Could not mmap fw_handle");
cq = ERR_PTR(ret);
goto create_cq_exit5;
}
my_cq->uspace_fwh = (u64)resp.galpas.kernel.fw_handle;
if (ib_copy_to_udata(udata, &resp, sizeof(resp))) {
ehca_err(device, "Copy to udata failed.");
goto create_cq_exit6;
}
}
return cq;
create_cq_exit6:
ehca_munmap(my_cq->uspace_fwh, EHCA_PAGESIZE);
create_cq_exit5:
ehca_munmap(my_cq->uspace_queue, my_cq->ipz_queue.queue_length);
create_cq_exit4:
ipz_queue_dtor(&my_cq->ipz_queue);
create_cq_exit3:
h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
if (h_ret != H_SUCCESS)
ehca_err(device, "hipz_h_destroy_cq() failed ehca_cq=%p "
"cq_num=%x h_ret=%lx", my_cq, my_cq->cq_number, h_ret);
create_cq_exit2:
spin_lock_irqsave(&ehca_cq_idr_lock, flags);
idr_remove(&ehca_cq_idr, my_cq->token);
spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
create_cq_exit1:
kmem_cache_free(cq_cache, my_cq);
return cq;
}
int ehca_destroy_cq(struct ib_cq *cq)
{
u64 h_ret;
int ret;
struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
int cq_num = my_cq->cq_number;
struct ib_device *device = cq->device;
struct ehca_shca *shca = container_of(device, struct ehca_shca,
ib_device);
struct ipz_adapter_handle adapter_handle = shca->ipz_hca_handle;
u32 cur_pid = current->tgid;
unsigned long flags;
spin_lock_irqsave(&ehca_cq_idr_lock, flags);
while (my_cq->nr_callbacks) {
spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
yield();
spin_lock_irqsave(&ehca_cq_idr_lock, flags);
}
idr_remove(&ehca_cq_idr, my_cq->token);
spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
if (my_cq->uspace_queue && my_cq->ownpid != cur_pid) {
ehca_err(device, "Invalid caller pid=%x ownpid=%x",
cur_pid, my_cq->ownpid);
return -EINVAL;
}
/* un-mmap if vma alloc */
if (my_cq->uspace_queue ) {
ret = ehca_munmap(my_cq->uspace_queue,
my_cq->ipz_queue.queue_length);
if (ret)
ehca_err(device, "Could not munmap queue ehca_cq=%p "
"cq_num=%x", my_cq, cq_num);
ret = ehca_munmap(my_cq->uspace_fwh, EHCA_PAGESIZE);
if (ret)
ehca_err(device, "Could not munmap fwh ehca_cq=%p "
"cq_num=%x", my_cq, cq_num);
}
h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 0);
if (h_ret == H_R_STATE) {
/* cq in err: read err data and destroy it forcibly */
ehca_dbg(device, "ehca_cq=%p cq_num=%x ressource=%lx in err "
"state. Try to delete it forcibly.",
my_cq, cq_num, my_cq->ipz_cq_handle.handle);
ehca_error_data(shca, my_cq, my_cq->ipz_cq_handle.handle);
h_ret = hipz_h_destroy_cq(adapter_handle, my_cq, 1);
if (h_ret == H_SUCCESS)
ehca_dbg(device, "cq_num=%x deleted successfully.",
cq_num);
}
if (h_ret != H_SUCCESS) {
ehca_err(device, "hipz_h_destroy_cq() failed h_ret=%lx "
"ehca_cq=%p cq_num=%x", h_ret, my_cq, cq_num);
return ehca2ib_return_code(h_ret);
}
ipz_queue_dtor(&my_cq->ipz_queue);
kmem_cache_free(cq_cache, my_cq);
return 0;
}
int ehca_resize_cq(struct ib_cq *cq, int cqe, struct ib_udata *udata)
{
struct ehca_cq *my_cq = container_of(cq, struct ehca_cq, ib_cq);
u32 cur_pid = current->tgid;
if (my_cq->uspace_queue && my_cq->ownpid != cur_pid) {
ehca_err(cq->device, "Invalid caller pid=%x ownpid=%x",
cur_pid, my_cq->ownpid);
return -EINVAL;
}
/* TODO: proper resize needs to be done */
ehca_err(cq->device, "not implemented yet");
return -EFAULT;
}
int ehca_init_cq_cache(void)
{
cq_cache = kmem_cache_create("ehca_cache_cq",
sizeof(struct ehca_cq), 0,
SLAB_HWCACHE_ALIGN,
NULL, NULL);
if (!cq_cache)
return -ENOMEM;
return 0;
}
void ehca_cleanup_cq_cache(void)
{
if (cq_cache)
kmem_cache_destroy(cq_cache);
}