blob: 2a65b5be19790f180d80b1ad4cbdd85bdad42d0a [file] [log] [blame]
/*
* IBM eServer eHCA Infiniband device driver for Linux on POWER
*
* Functions for EQs, NEQs and interrupts
*
* Authors: Heiko J Schick <schickhj@de.ibm.com>
* Khadija Souissi <souissi@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 "ehca_classes.h"
#include "ehca_irq.h"
#include "ehca_iverbs.h"
#include "ehca_tools.h"
#include "hcp_if.h"
#include "hipz_fns.h"
#define EQE_COMPLETION_EVENT EHCA_BMASK_IBM(1,1)
#define EQE_CQ_QP_NUMBER EHCA_BMASK_IBM(8,31)
#define EQE_EE_IDENTIFIER EHCA_BMASK_IBM(2,7)
#define EQE_CQ_NUMBER EHCA_BMASK_IBM(8,31)
#define EQE_QP_NUMBER EHCA_BMASK_IBM(8,31)
#define EQE_QP_TOKEN EHCA_BMASK_IBM(32,63)
#define EQE_CQ_TOKEN EHCA_BMASK_IBM(32,63)
#define NEQE_COMPLETION_EVENT EHCA_BMASK_IBM(1,1)
#define NEQE_EVENT_CODE EHCA_BMASK_IBM(2,7)
#define NEQE_PORT_NUMBER EHCA_BMASK_IBM(8,15)
#define NEQE_PORT_AVAILABILITY EHCA_BMASK_IBM(16,16)
#define ERROR_DATA_LENGTH EHCA_BMASK_IBM(52,63)
#define ERROR_DATA_TYPE EHCA_BMASK_IBM(0,7)
#ifdef CONFIG_INFINIBAND_EHCA_SCALING
static void queue_comp_task(struct ehca_cq *__cq);
static struct ehca_comp_pool* pool;
static struct notifier_block comp_pool_callback_nb;
#endif
static inline void comp_event_callback(struct ehca_cq *cq)
{
if (!cq->ib_cq.comp_handler)
return;
spin_lock(&cq->cb_lock);
cq->ib_cq.comp_handler(&cq->ib_cq, cq->ib_cq.cq_context);
spin_unlock(&cq->cb_lock);
return;
}
static void print_error_data(struct ehca_shca * shca, void* data,
u64* rblock, int length)
{
u64 type = EHCA_BMASK_GET(ERROR_DATA_TYPE, rblock[2]);
u64 resource = rblock[1];
switch (type) {
case 0x1: /* Queue Pair */
{
struct ehca_qp *qp = (struct ehca_qp*)data;
/* only print error data if AER is set */
if (rblock[6] == 0)
return;
ehca_err(&shca->ib_device,
"QP 0x%x (resource=%lx) has errors.",
qp->ib_qp.qp_num, resource);
break;
}
case 0x4: /* Completion Queue */
{
struct ehca_cq *cq = (struct ehca_cq*)data;
ehca_err(&shca->ib_device,
"CQ 0x%x (resource=%lx) has errors.",
cq->cq_number, resource);
break;
}
default:
ehca_err(&shca->ib_device,
"Unknown errror type: %lx on %s.",
type, shca->ib_device.name);
break;
}
ehca_err(&shca->ib_device, "Error data is available: %lx.", resource);
ehca_err(&shca->ib_device, "EHCA ----- error data begin "
"---------------------------------------------------");
ehca_dmp(rblock, length, "resource=%lx", resource);
ehca_err(&shca->ib_device, "EHCA ----- error data end "
"----------------------------------------------------");
return;
}
int ehca_error_data(struct ehca_shca *shca, void *data,
u64 resource)
{
unsigned long ret;
u64 *rblock;
unsigned long block_count;
rblock = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
if (!rblock) {
ehca_err(&shca->ib_device, "Cannot allocate rblock memory.");
ret = -ENOMEM;
goto error_data1;
}
ret = hipz_h_error_data(shca->ipz_hca_handle,
resource,
rblock,
&block_count);
if (ret == H_R_STATE) {
ehca_err(&shca->ib_device,
"No error data is available: %lx.", resource);
}
else if (ret == H_SUCCESS) {
int length;
length = EHCA_BMASK_GET(ERROR_DATA_LENGTH, rblock[0]);
if (length > PAGE_SIZE)
length = PAGE_SIZE;
print_error_data(shca, data, rblock, length);
}
else {
ehca_err(&shca->ib_device,
"Error data could not be fetched: %lx", resource);
}
kfree(rblock);
error_data1:
return ret;
}
static void qp_event_callback(struct ehca_shca *shca,
u64 eqe,
enum ib_event_type event_type)
{
struct ib_event event;
struct ehca_qp *qp;
unsigned long flags;
u32 token = EHCA_BMASK_GET(EQE_QP_TOKEN, eqe);
spin_lock_irqsave(&ehca_qp_idr_lock, flags);
qp = idr_find(&ehca_qp_idr, token);
spin_unlock_irqrestore(&ehca_qp_idr_lock, flags);
if (!qp)
return;
ehca_error_data(shca, qp, qp->ipz_qp_handle.handle);
if (!qp->ib_qp.event_handler)
return;
event.device = &shca->ib_device;
event.event = event_type;
event.element.qp = &qp->ib_qp;
qp->ib_qp.event_handler(&event, qp->ib_qp.qp_context);
return;
}
static void cq_event_callback(struct ehca_shca *shca,
u64 eqe)
{
struct ehca_cq *cq;
unsigned long flags;
u32 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe);
spin_lock_irqsave(&ehca_cq_idr_lock, flags);
cq = idr_find(&ehca_cq_idr, token);
spin_unlock_irqrestore(&ehca_cq_idr_lock, flags);
if (!cq)
return;
ehca_error_data(shca, cq, cq->ipz_cq_handle.handle);
return;
}
static void parse_identifier(struct ehca_shca *shca, u64 eqe)
{
u8 identifier = EHCA_BMASK_GET(EQE_EE_IDENTIFIER, eqe);
switch (identifier) {
case 0x02: /* path migrated */
qp_event_callback(shca, eqe, IB_EVENT_PATH_MIG);
break;
case 0x03: /* communication established */
qp_event_callback(shca, eqe, IB_EVENT_COMM_EST);
break;
case 0x04: /* send queue drained */
qp_event_callback(shca, eqe, IB_EVENT_SQ_DRAINED);
break;
case 0x05: /* QP error */
case 0x06: /* QP error */
qp_event_callback(shca, eqe, IB_EVENT_QP_FATAL);
break;
case 0x07: /* CQ error */
case 0x08: /* CQ error */
cq_event_callback(shca, eqe);
break;
case 0x09: /* MRMWPTE error */
ehca_err(&shca->ib_device, "MRMWPTE error.");
break;
case 0x0A: /* port event */
ehca_err(&shca->ib_device, "Port event.");
break;
case 0x0B: /* MR access error */
ehca_err(&shca->ib_device, "MR access error.");
break;
case 0x0C: /* EQ error */
ehca_err(&shca->ib_device, "EQ error.");
break;
case 0x0D: /* P/Q_Key mismatch */
ehca_err(&shca->ib_device, "P/Q_Key mismatch.");
break;
case 0x10: /* sampling complete */
ehca_err(&shca->ib_device, "Sampling complete.");
break;
case 0x11: /* unaffiliated access error */
ehca_err(&shca->ib_device, "Unaffiliated access error.");
break;
case 0x12: /* path migrating error */
ehca_err(&shca->ib_device, "Path migration error.");
break;
case 0x13: /* interface trace stopped */
ehca_err(&shca->ib_device, "Interface trace stopped.");
break;
case 0x14: /* first error capture info available */
default:
ehca_err(&shca->ib_device, "Unknown identifier: %x on %s.",
identifier, shca->ib_device.name);
break;
}
return;
}
static void parse_ec(struct ehca_shca *shca, u64 eqe)
{
struct ib_event event;
u8 ec = EHCA_BMASK_GET(NEQE_EVENT_CODE, eqe);
u8 port = EHCA_BMASK_GET(NEQE_PORT_NUMBER, eqe);
switch (ec) {
case 0x30: /* port availability change */
if (EHCA_BMASK_GET(NEQE_PORT_AVAILABILITY, eqe)) {
ehca_info(&shca->ib_device,
"port %x is active.", port);
event.device = &shca->ib_device;
event.event = IB_EVENT_PORT_ACTIVE;
event.element.port_num = port;
shca->sport[port - 1].port_state = IB_PORT_ACTIVE;
ib_dispatch_event(&event);
} else {
ehca_info(&shca->ib_device,
"port %x is inactive.", port);
event.device = &shca->ib_device;
event.event = IB_EVENT_PORT_ERR;
event.element.port_num = port;
shca->sport[port - 1].port_state = IB_PORT_DOWN;
ib_dispatch_event(&event);
}
break;
case 0x31:
/* port configuration change
* disruptive change is caused by
* LID, PKEY or SM change
*/
ehca_warn(&shca->ib_device,
"disruptive port %x configuration change", port);
ehca_info(&shca->ib_device,
"port %x is inactive.", port);
event.device = &shca->ib_device;
event.event = IB_EVENT_PORT_ERR;
event.element.port_num = port;
shca->sport[port - 1].port_state = IB_PORT_DOWN;
ib_dispatch_event(&event);
ehca_info(&shca->ib_device,
"port %x is active.", port);
event.device = &shca->ib_device;
event.event = IB_EVENT_PORT_ACTIVE;
event.element.port_num = port;
shca->sport[port - 1].port_state = IB_PORT_ACTIVE;
ib_dispatch_event(&event);
break;
case 0x32: /* adapter malfunction */
ehca_err(&shca->ib_device, "Adapter malfunction.");
break;
case 0x33: /* trace stopped */
ehca_err(&shca->ib_device, "Traced stopped.");
break;
default:
ehca_err(&shca->ib_device, "Unknown event code: %x on %s.",
ec, shca->ib_device.name);
break;
}
return;
}
static inline void reset_eq_pending(struct ehca_cq *cq)
{
u64 CQx_EP;
struct h_galpa gal = cq->galpas.kernel;
hipz_galpa_store_cq(gal, cqx_ep, 0x0);
CQx_EP = hipz_galpa_load(gal, CQTEMM_OFFSET(cqx_ep));
return;
}
irqreturn_t ehca_interrupt_neq(int irq, void *dev_id, struct pt_regs *regs)
{
struct ehca_shca *shca = (struct ehca_shca*)dev_id;
tasklet_hi_schedule(&shca->neq.interrupt_task);
return IRQ_HANDLED;
}
void ehca_tasklet_neq(unsigned long data)
{
struct ehca_shca *shca = (struct ehca_shca*)data;
struct ehca_eqe *eqe;
u64 ret;
eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->neq);
while (eqe) {
if (!EHCA_BMASK_GET(NEQE_COMPLETION_EVENT, eqe->entry))
parse_ec(shca, eqe->entry);
eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->neq);
}
ret = hipz_h_reset_event(shca->ipz_hca_handle,
shca->neq.ipz_eq_handle, 0xFFFFFFFFFFFFFFFFL);
if (ret != H_SUCCESS)
ehca_err(&shca->ib_device, "Can't clear notification events.");
return;
}
irqreturn_t ehca_interrupt_eq(int irq, void *dev_id, struct pt_regs *regs)
{
struct ehca_shca *shca = (struct ehca_shca*)dev_id;
tasklet_hi_schedule(&shca->eq.interrupt_task);
return IRQ_HANDLED;
}
void ehca_tasklet_eq(unsigned long data)
{
struct ehca_shca *shca = (struct ehca_shca*)data;
struct ehca_eqe *eqe;
int int_state;
int query_cnt = 0;
do {
eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->eq);
if ((shca->hw_level >= 2) && eqe)
int_state = 1;
else
int_state = 0;
while ((int_state == 1) || eqe) {
while (eqe) {
u64 eqe_value = eqe->entry;
ehca_dbg(&shca->ib_device,
"eqe_value=%lx", eqe_value);
/* TODO: better structure */
if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT,
eqe_value)) {
unsigned long flags;
u32 token;
struct ehca_cq *cq;
ehca_dbg(&shca->ib_device,
"... completion event");
token =
EHCA_BMASK_GET(EQE_CQ_TOKEN,
eqe_value);
spin_lock_irqsave(&ehca_cq_idr_lock,
flags);
cq = idr_find(&ehca_cq_idr, token);
if (cq == NULL) {
spin_unlock(&ehca_cq_idr_lock);
break;
}
reset_eq_pending(cq);
#ifdef CONFIG_INFINIBAND_EHCA_SCALING
queue_comp_task(cq);
spin_unlock_irqrestore(&ehca_cq_idr_lock,
flags);
#else
spin_unlock_irqrestore(&ehca_cq_idr_lock,
flags);
comp_event_callback(cq);
#endif
} else {
ehca_dbg(&shca->ib_device,
"... non completion event");
parse_identifier(shca, eqe_value);
}
eqe =
(struct ehca_eqe *)ehca_poll_eq(shca,
&shca->eq);
}
if (shca->hw_level >= 2) {
int_state =
hipz_h_query_int_state(shca->ipz_hca_handle,
shca->eq.ist);
query_cnt++;
iosync();
if (query_cnt >= 100) {
query_cnt = 0;
int_state = 0;
}
}
eqe = (struct ehca_eqe *)ehca_poll_eq(shca, &shca->eq);
}
} while (int_state != 0);
return;
}
#ifdef CONFIG_INFINIBAND_EHCA_SCALING
static inline int find_next_online_cpu(struct ehca_comp_pool* pool)
{
unsigned long flags_last_cpu;
if (ehca_debug_level)
ehca_dmp(&cpu_online_map, sizeof(cpumask_t), "");
spin_lock_irqsave(&pool->last_cpu_lock, flags_last_cpu);
pool->last_cpu = next_cpu(pool->last_cpu, cpu_online_map);
if (pool->last_cpu == NR_CPUS)
pool->last_cpu = first_cpu(cpu_online_map);
spin_unlock_irqrestore(&pool->last_cpu_lock, flags_last_cpu);
return pool->last_cpu;
}
static void __queue_comp_task(struct ehca_cq *__cq,
struct ehca_cpu_comp_task *cct)
{
unsigned long flags_cct;
unsigned long flags_cq;
spin_lock_irqsave(&cct->task_lock, flags_cct);
spin_lock_irqsave(&__cq->task_lock, flags_cq);
if (__cq->nr_callbacks == 0) {
__cq->nr_callbacks++;
list_add_tail(&__cq->entry, &cct->cq_list);
cct->cq_jobs++;
wake_up(&cct->wait_queue);
}
else
__cq->nr_callbacks++;
spin_unlock_irqrestore(&__cq->task_lock, flags_cq);
spin_unlock_irqrestore(&cct->task_lock, flags_cct);
}
static void queue_comp_task(struct ehca_cq *__cq)
{
int cpu;
int cpu_id;
struct ehca_cpu_comp_task *cct;
cpu = get_cpu();
cpu_id = find_next_online_cpu(pool);
BUG_ON(!cpu_online(cpu_id));
cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
if (cct->cq_jobs > 0) {
cpu_id = find_next_online_cpu(pool);
cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id);
}
__queue_comp_task(__cq, cct);
put_cpu();
return;
}
static void run_comp_task(struct ehca_cpu_comp_task* cct)
{
struct ehca_cq *cq;
unsigned long flags_cct;
unsigned long flags_cq;
spin_lock_irqsave(&cct->task_lock, flags_cct);
while (!list_empty(&cct->cq_list)) {
cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
spin_unlock_irqrestore(&cct->task_lock, flags_cct);
comp_event_callback(cq);
spin_lock_irqsave(&cct->task_lock, flags_cct);
spin_lock_irqsave(&cq->task_lock, flags_cq);
cq->nr_callbacks--;
if (cq->nr_callbacks == 0) {
list_del_init(cct->cq_list.next);
cct->cq_jobs--;
}
spin_unlock_irqrestore(&cq->task_lock, flags_cq);
}
spin_unlock_irqrestore(&cct->task_lock, flags_cct);
return;
}
static int comp_task(void *__cct)
{
struct ehca_cpu_comp_task* cct = __cct;
DECLARE_WAITQUEUE(wait, current);
set_current_state(TASK_INTERRUPTIBLE);
while(!kthread_should_stop()) {
add_wait_queue(&cct->wait_queue, &wait);
if (list_empty(&cct->cq_list))
schedule();
else
__set_current_state(TASK_RUNNING);
remove_wait_queue(&cct->wait_queue, &wait);
if (!list_empty(&cct->cq_list))
run_comp_task(__cct);
set_current_state(TASK_INTERRUPTIBLE);
}
__set_current_state(TASK_RUNNING);
return 0;
}
static struct task_struct *create_comp_task(struct ehca_comp_pool *pool,
int cpu)
{
struct ehca_cpu_comp_task *cct;
cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
spin_lock_init(&cct->task_lock);
INIT_LIST_HEAD(&cct->cq_list);
init_waitqueue_head(&cct->wait_queue);
cct->task = kthread_create(comp_task, cct, "ehca_comp/%d", cpu);
return cct->task;
}
static void destroy_comp_task(struct ehca_comp_pool *pool,
int cpu)
{
struct ehca_cpu_comp_task *cct;
struct task_struct *task;
unsigned long flags_cct;
cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
spin_lock_irqsave(&cct->task_lock, flags_cct);
task = cct->task;
cct->task = NULL;
cct->cq_jobs = 0;
spin_unlock_irqrestore(&cct->task_lock, flags_cct);
if (task)
kthread_stop(task);
return;
}
static void take_over_work(struct ehca_comp_pool *pool,
int cpu)
{
struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
LIST_HEAD(list);
struct ehca_cq *cq;
unsigned long flags_cct;
spin_lock_irqsave(&cct->task_lock, flags_cct);
list_splice_init(&cct->cq_list, &list);
while(!list_empty(&list)) {
cq = list_entry(cct->cq_list.next, struct ehca_cq, entry);
list_del(&cq->entry);
__queue_comp_task(cq, per_cpu_ptr(pool->cpu_comp_tasks,
smp_processor_id()));
}
spin_unlock_irqrestore(&cct->task_lock, flags_cct);
}
static int comp_pool_callback(struct notifier_block *nfb,
unsigned long action,
void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
struct ehca_cpu_comp_task *cct;
switch (action) {
case CPU_UP_PREPARE:
ehca_gen_dbg("CPU: %x (CPU_PREPARE)", cpu);
if(!create_comp_task(pool, cpu)) {
ehca_gen_err("Can't create comp_task for cpu: %x", cpu);
return NOTIFY_BAD;
}
break;
case CPU_UP_CANCELED:
ehca_gen_dbg("CPU: %x (CPU_CANCELED)", cpu);
cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
kthread_bind(cct->task, any_online_cpu(cpu_online_map));
destroy_comp_task(pool, cpu);
break;
case CPU_ONLINE:
ehca_gen_dbg("CPU: %x (CPU_ONLINE)", cpu);
cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu);
kthread_bind(cct->task, cpu);
wake_up_process(cct->task);
break;
case CPU_DOWN_PREPARE:
ehca_gen_dbg("CPU: %x (CPU_DOWN_PREPARE)", cpu);
break;
case CPU_DOWN_FAILED:
ehca_gen_dbg("CPU: %x (CPU_DOWN_FAILED)", cpu);
break;
case CPU_DEAD:
ehca_gen_dbg("CPU: %x (CPU_DEAD)", cpu);
destroy_comp_task(pool, cpu);
take_over_work(pool, cpu);
break;
}
return NOTIFY_OK;
}
#endif
int ehca_create_comp_pool(void)
{
#ifdef CONFIG_INFINIBAND_EHCA_SCALING
int cpu;
struct task_struct *task;
pool = kzalloc(sizeof(struct ehca_comp_pool), GFP_KERNEL);
if (pool == NULL)
return -ENOMEM;
spin_lock_init(&pool->last_cpu_lock);
pool->last_cpu = any_online_cpu(cpu_online_map);
pool->cpu_comp_tasks = alloc_percpu(struct ehca_cpu_comp_task);
if (pool->cpu_comp_tasks == NULL) {
kfree(pool);
return -EINVAL;
}
for_each_online_cpu(cpu) {
task = create_comp_task(pool, cpu);
if (task) {
kthread_bind(task, cpu);
wake_up_process(task);
}
}
comp_pool_callback_nb.notifier_call = comp_pool_callback;
comp_pool_callback_nb.priority =0;
register_cpu_notifier(&comp_pool_callback_nb);
#endif
return 0;
}
void ehca_destroy_comp_pool(void)
{
#ifdef CONFIG_INFINIBAND_EHCA_SCALING
int i;
unregister_cpu_notifier(&comp_pool_callback_nb);
for (i = 0; i < NR_CPUS; i++) {
if (cpu_online(i))
destroy_comp_task(pool, i);
}
#endif
return;
}