diff options
Diffstat (limited to 'drivers/staging/rdma/ehca/ehca_irq.c')
| -rw-r--r-- | drivers/staging/rdma/ehca/ehca_irq.c | 870 |
1 files changed, 0 insertions, 870 deletions
diff --git a/drivers/staging/rdma/ehca/ehca_irq.c b/drivers/staging/rdma/ehca/ehca_irq.c deleted file mode 100644 index 8615d7cf7e01..000000000000 --- a/drivers/staging/rdma/ehca/ehca_irq.c +++ /dev/null @@ -1,870 +0,0 @@ -/* - * 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> - * Hoang-Nam Nguyen <hnguyen@de.ibm.com> - * Joachim Fenkes <fenkes@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 <linux/slab.h> -#include <linux/smpboot.h> - -#include "ehca_classes.h" -#include "ehca_irq.h" -#include "ehca_iverbs.h" -#include "ehca_tools.h" -#include "hcp_if.h" -#include "hipz_fns.h" -#include "ipz_pt_fn.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 NEQE_DISRUPTIVE EHCA_BMASK_IBM(16, 16) -#define NEQE_SPECIFIC_EVENT EHCA_BMASK_IBM(16, 23) - -#define ERROR_DATA_LENGTH EHCA_BMASK_IBM(52, 63) -#define ERROR_DATA_TYPE EHCA_BMASK_IBM( 0, 7) - -static void queue_comp_task(struct ehca_cq *__cq); - -static struct ehca_comp_pool *pool; - -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=%llx) 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=%llx) has errors.", - cq->cq_number, resource); - break; - } - default: - ehca_err(&shca->ib_device, - "Unknown error type: %llx on %s.", - type, shca->ib_device.name); - break; - } - - ehca_err(&shca->ib_device, "Error data is available: %llx.", resource); - ehca_err(&shca->ib_device, "EHCA ----- error data begin " - "---------------------------------------------------"); - ehca_dmp(rblock, length, "resource=%llx", 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 = ehca_alloc_fw_ctrlblock(GFP_ATOMIC); - if (!rblock) { - ehca_err(&shca->ib_device, "Cannot allocate rblock memory."); - ret = -ENOMEM; - goto error_data1; - } - - /* rblock must be 4K aligned and should be 4K large */ - 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: %llx.", resource); - else if (ret == H_SUCCESS) { - int length; - - length = EHCA_BMASK_GET(ERROR_DATA_LENGTH, rblock[0]); - - if (length > EHCA_PAGESIZE) - length = EHCA_PAGESIZE; - - print_error_data(shca, data, rblock, length); - } else - ehca_err(&shca->ib_device, - "Error data could not be fetched: %llx", resource); - - ehca_free_fw_ctrlblock(rblock); - -error_data1: - return ret; - -} - -static void dispatch_qp_event(struct ehca_shca *shca, struct ehca_qp *qp, - enum ib_event_type event_type) -{ - struct ib_event event; - - /* PATH_MIG without the QP ever having been armed is false alarm */ - if (event_type == IB_EVENT_PATH_MIG && !qp->mig_armed) - return; - - event.device = &shca->ib_device; - event.event = event_type; - - if (qp->ext_type == EQPT_SRQ) { - if (!qp->ib_srq.event_handler) - return; - - event.element.srq = &qp->ib_srq; - qp->ib_srq.event_handler(&event, qp->ib_srq.srq_context); - } else { - if (!qp->ib_qp.event_handler) - return; - - event.element.qp = &qp->ib_qp; - qp->ib_qp.event_handler(&event, qp->ib_qp.qp_context); - } -} - -static void qp_event_callback(struct ehca_shca *shca, u64 eqe, - enum ib_event_type event_type, int fatal) -{ - struct ehca_qp *qp; - u32 token = EHCA_BMASK_GET(EQE_QP_TOKEN, eqe); - - read_lock(&ehca_qp_idr_lock); - qp = idr_find(&ehca_qp_idr, token); - if (qp) - atomic_inc(&qp->nr_events); - read_unlock(&ehca_qp_idr_lock); - - if (!qp) - return; - - if (fatal) - ehca_error_data(shca, qp, qp->ipz_qp_handle.handle); - - dispatch_qp_event(shca, qp, fatal && qp->ext_type == EQPT_SRQ ? - IB_EVENT_SRQ_ERR : event_type); - - /* - * eHCA only processes one WQE at a time for SRQ base QPs, - * so the last WQE has been processed as soon as the QP enters - * error state. - */ - if (fatal && qp->ext_type == EQPT_SRQBASE) - dispatch_qp_event(shca, qp, IB_EVENT_QP_LAST_WQE_REACHED); - - if (atomic_dec_and_test(&qp->nr_events)) - wake_up(&qp->wait_completion); - return; -} - -static void cq_event_callback(struct ehca_shca *shca, - u64 eqe) -{ - struct ehca_cq *cq; - u32 token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe); - - read_lock(&ehca_cq_idr_lock); - cq = idr_find(&ehca_cq_idr, token); - if (cq) - atomic_inc(&cq->nr_events); - read_unlock(&ehca_cq_idr_lock); - - if (!cq) - return; - - ehca_error_data(shca, cq, cq->ipz_cq_handle.handle); - - if (atomic_dec_and_test(&cq->nr_events)) - wake_up(&cq->wait_completion); - - 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, 0); - break; - case 0x03: /* communication established */ - qp_event_callback(shca, eqe, IB_EVENT_COMM_EST, 0); - break; - case 0x04: /* send queue drained */ - qp_event_callback(shca, eqe, IB_EVENT_SQ_DRAINED, 0); - break; - case 0x05: /* QP error */ - case 0x06: /* QP error */ - qp_event_callback(shca, eqe, IB_EVENT_QP_FATAL, 1); - 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 */ - ehca_err(&shca->ib_device, "Path migrating."); - break; - case 0x13: /* interface trace stopped */ - ehca_err(&shca->ib_device, "Interface trace stopped."); - break; - case 0x14: /* first error capture info available */ - ehca_info(&shca->ib_device, "First error capture available"); - break; - case 0x15: /* SRQ limit reached */ - qp_event_callback(shca, eqe, IB_EVENT_SRQ_LIMIT_REACHED, 0); - break; - default: - ehca_err(&shca->ib_device, "Unknown identifier: %x on %s.", - identifier, shca->ib_device.name); - break; - } - - return; -} - -static void dispatch_port_event(struct ehca_shca *shca, int port_num, - enum ib_event_type type, const char *msg) -{ - struct ib_event event; - - ehca_info(&shca->ib_device, "port %d %s.", port_num, msg); - event.device = &shca->ib_device; - event.event = type; - event.element.port_num = port_num; - ib_dispatch_event(&event); -} - -static void notify_port_conf_change(struct ehca_shca *shca, int port_num) -{ - struct ehca_sma_attr new_attr; - struct ehca_sma_attr *old_attr = &shca->sport[port_num - 1].saved_attr; - - ehca_query_sma_attr(shca, port_num, &new_attr); - - if (new_attr.sm_sl != old_attr->sm_sl || - new_attr.sm_lid != old_attr->sm_lid) - dispatch_port_event(shca, port_num, IB_EVENT_SM_CHANGE, - "SM changed"); - - if (new_attr.lid != old_attr->lid || - new_attr.lmc != old_attr->lmc) - dispatch_port_event(shca, port_num, IB_EVENT_LID_CHANGE, - "LID changed"); - - if (new_attr.pkey_tbl_len != old_attr->pkey_tbl_len || - memcmp(new_attr.pkeys, old_attr->pkeys, - sizeof(u16) * new_attr.pkey_tbl_len)) - dispatch_port_event(shca, port_num, IB_EVENT_PKEY_CHANGE, - "P_Key changed"); - - *old_attr = new_attr; -} - -/* replay modify_qp for sqps -- return 0 if all is well, 1 if AQP1 destroyed */ -static int replay_modify_qp(struct ehca_sport *sport) -{ - int aqp1_destroyed; - unsigned long flags; - - spin_lock_irqsave(&sport->mod_sqp_lock, flags); - - aqp1_destroyed = !sport->ibqp_sqp[IB_QPT_GSI]; - - if (sport->ibqp_sqp[IB_QPT_SMI]) - ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_SMI]); - if (!aqp1_destroyed) - ehca_recover_sqp(sport->ibqp_sqp[IB_QPT_GSI]); - - spin_unlock_irqrestore(&sport->mod_sqp_lock, flags); - - return aqp1_destroyed; -} - -static void parse_ec(struct ehca_shca *shca, u64 eqe) -{ - u8 ec = EHCA_BMASK_GET(NEQE_EVENT_CODE, eqe); - u8 port = EHCA_BMASK_GET(NEQE_PORT_NUMBER, eqe); - u8 spec_event; - struct ehca_sport *sport = &shca->sport[port - 1]; - - switch (ec) { - case 0x30: /* port availability change */ - if (EHCA_BMASK_GET(NEQE_PORT_AVAILABILITY, eqe)) { - /* only replay modify_qp calls in autodetect mode; - * if AQP1 was destroyed, the port is already down - * again and we can drop the event. - */ - if (ehca_nr_ports < 0) - if (replay_modify_qp(sport)) - break; - - sport->port_state = IB_PORT_ACTIVE; - dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE, - "is active"); - ehca_query_sma_attr(shca, port, &sport->saved_attr); - } else { - sport->port_state = IB_PORT_DOWN; - dispatch_port_event(shca, port, IB_EVENT_PORT_ERR, - "is inactive"); - } - break; - case 0x31: - /* port configuration change - * disruptive change is caused by - * LID, PKEY or SM change - */ - if (EHCA_BMASK_GET(NEQE_DISRUPTIVE, eqe)) { - ehca_warn(&shca->ib_device, "disruptive port " - "%d configuration change", port); - - sport->port_state = IB_PORT_DOWN; - dispatch_port_event(shca, port, IB_EVENT_PORT_ERR, - "is inactive"); - - sport->port_state = IB_PORT_ACTIVE; - dispatch_port_event(shca, port, IB_EVENT_PORT_ACTIVE, - "is active"); - ehca_query_sma_attr(shca, port, - &sport->saved_attr); - } else - notify_port_conf_change(shca, port); - 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; - case 0x34: /* util async event */ - spec_event = EHCA_BMASK_GET(NEQE_SPECIFIC_EVENT, eqe); - if (spec_event == 0x80) /* client reregister required */ - dispatch_port_event(shca, port, - IB_EVENT_CLIENT_REREGISTER, - "client reregister req."); - else - ehca_warn(&shca->ib_device, "Unknown util async " - "event %x on port %x", spec_event, port); - 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 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 = ehca_poll_eq(shca, &shca->neq); - - while (eqe) { - if (!EHCA_BMASK_GET(NEQE_COMPLETION_EVENT, eqe->entry)) - parse_ec(shca, eqe->entry); - - 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 ehca_shca *shca = (struct ehca_shca*)dev_id; - - tasklet_hi_schedule(&shca->eq.interrupt_task); - - return IRQ_HANDLED; -} - - -static inline void process_eqe(struct ehca_shca *shca, struct ehca_eqe *eqe) -{ - u64 eqe_value; - u32 token; - struct ehca_cq *cq; - - eqe_value = eqe->entry; - ehca_dbg(&shca->ib_device, "eqe_value=%llx", eqe_value); - if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) { - ehca_dbg(&shca->ib_device, "Got completion event"); - token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value); - read_lock(&ehca_cq_idr_lock); - cq = idr_find(&ehca_cq_idr, token); - if (cq) - atomic_inc(&cq->nr_events); - read_unlock(&ehca_cq_idr_lock); - if (cq == NULL) { - ehca_err(&shca->ib_device, - "Invalid eqe for non-existing cq token=%x", - token); - return; - } - reset_eq_pending(cq); - if (ehca_scaling_code) - queue_comp_task(cq); - else { - comp_event_callback(cq); - if (atomic_dec_and_test(&cq->nr_events)) - wake_up(&cq->wait_completion); - } - } else { - ehca_dbg(&shca->ib_device, "Got non completion event"); - parse_identifier(shca, eqe_value); - } -} - -void ehca_process_eq(struct ehca_shca *shca, int is_irq) -{ - struct ehca_eq *eq = &shca->eq; - struct ehca_eqe_cache_entry *eqe_cache = eq->eqe_cache; - u64 eqe_value, ret; - int eqe_cnt, i; - int eq_empty = 0; - - spin_lock(&eq->irq_spinlock); - if (is_irq) { - const int max_query_cnt = 100; - int query_cnt = 0; - int int_state = 1; - do { - int_state = hipz_h_query_int_state( - shca->ipz_hca_handle, eq->ist); - query_cnt++; - iosync(); - } while (int_state && query_cnt < max_query_cnt); - if (unlikely((query_cnt == max_query_cnt))) - ehca_dbg(&shca->ib_device, "int_state=%x query_cnt=%x", - int_state, query_cnt); - } - - /* read out all eqes */ - eqe_cnt = 0; - do { - u32 token; - eqe_cache[eqe_cnt].eqe = ehca_poll_eq(shca, eq); - if (!eqe_cache[eqe_cnt].eqe) - break; - eqe_value = eqe_cache[eqe_cnt].eqe->entry; - if (EHCA_BMASK_GET(EQE_COMPLETION_EVENT, eqe_value)) { - token = EHCA_BMASK_GET(EQE_CQ_TOKEN, eqe_value); - read_lock(&ehca_cq_idr_lock); - eqe_cache[eqe_cnt].cq = idr_find(&ehca_cq_idr, token); - if (eqe_cache[eqe_cnt].cq) - atomic_inc(&eqe_cache[eqe_cnt].cq->nr_events); - read_unlock(&ehca_cq_idr_lock); - if (!eqe_cache[eqe_cnt].cq) { - ehca_err(&shca->ib_device, - "Invalid eqe for non-existing cq " - "token=%x", token); - continue; - } - } else - eqe_cache[eqe_cnt].cq = NULL; - eqe_cnt++; - } while (eqe_cnt < EHCA_EQE_CACHE_SIZE); - if (!eqe_cnt) { - if (is_irq) - ehca_dbg(&shca->ib_device, - "No eqe found for irq event"); - goto unlock_irq_spinlock; - } else if (!is_irq) { - ret = hipz_h_eoi(eq->ist); - if (ret != H_SUCCESS) - ehca_err(&shca->ib_device, - "bad return code EOI -rc = %lld\n", ret); - ehca_dbg(&shca->ib_device, "deadman found %x eqe", eqe_cnt); - } - if (unlikely(eqe_cnt == EHCA_EQE_CACHE_SIZE)) - ehca_dbg(&shca->ib_device, "too many eqes for one irq event"); - /* enable irq for new packets */ - for (i = 0; i < eqe_cnt; i++) { - if (eq->eqe_cache[i].cq) - reset_eq_pending(eq->eqe_cache[i].cq); - } - /* check eq */ - spin_lock(&eq->spinlock); - eq_empty = (!ipz_eqit_eq_peek_valid(&shca->eq.ipz_queue)); - spin_unlock(&eq->spinlock); - /* call completion handler for cached eqes */ - for (i = 0; i < eqe_cnt; i++) - if (eq->eqe_cache[i].cq) { - if (ehca_scaling_code) - queue_comp_task(eq->eqe_cache[i].cq); - else { - struct ehca_cq *cq = eq->eqe_cache[i].cq; - comp_event_callback(cq); - if (atomic_dec_and_test(&cq->nr_events)) - wake_up(&cq->wait_completion); - } - } else { - ehca_dbg(&shca->ib_device, "Got non completion event"); - parse_identifier(shca, eq->eqe_cache[i].eqe->entry); - } - /* poll eq if not empty */ - if (eq_empty) - goto unlock_irq_spinlock; - do { - struct ehca_eqe *eqe; - eqe = ehca_poll_eq(shca, &shca->eq); - if (!eqe) - break; - process_eqe(shca, eqe); - } while (1); - -unlock_irq_spinlock: - spin_unlock(&eq->irq_spinlock); -} - -void ehca_tasklet_eq(unsigned long data) -{ - ehca_process_eq((struct ehca_shca*)data, 1); -} - -static int find_next_online_cpu(struct ehca_comp_pool *pool) -{ - int cpu; - unsigned long flags; - - WARN_ON_ONCE(!in_interrupt()); - if (ehca_debug_level >= 3) - ehca_dmp(cpu_online_mask, cpumask_size(), ""); - - spin_lock_irqsave(&pool->last_cpu_lock, flags); - do { - cpu = cpumask_next(pool->last_cpu, cpu_online_mask); - if (cpu >= nr_cpu_ids) - cpu = cpumask_first(cpu_online_mask); - pool->last_cpu = cpu; - } while (!per_cpu_ptr(pool->cpu_comp_tasks, cpu)->active); - spin_unlock_irqrestore(&pool->last_cpu_lock, flags); - - return cpu; -} - -static void __queue_comp_task(struct ehca_cq *__cq, - struct ehca_cpu_comp_task *cct, - struct task_struct *thread) -{ - unsigned long flags; - - spin_lock_irqsave(&cct->task_lock, flags); - spin_lock(&__cq->task_lock); - - if (__cq->nr_callbacks == 0) { - __cq->nr_callbacks++; - list_add_tail(&__cq->entry, &cct->cq_list); - cct->cq_jobs++; - wake_up_process(thread); - } else - __cq->nr_callbacks++; - - spin_unlock(&__cq->task_lock); - spin_unlock_irqrestore(&cct->task_lock, flags); -} - -static void queue_comp_task(struct ehca_cq *__cq) -{ - int cpu_id; - struct ehca_cpu_comp_task *cct; - struct task_struct *thread; - int cq_jobs; - unsigned long flags; - - cpu_id = find_next_online_cpu(pool); - BUG_ON(!cpu_online(cpu_id)); - - cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id); - thread = *per_cpu_ptr(pool->cpu_comp_threads, cpu_id); - BUG_ON(!cct || !thread); - - spin_lock_irqsave(&cct->task_lock, flags); - cq_jobs = cct->cq_jobs; - spin_unlock_irqrestore(&cct->task_lock, flags); - if (cq_jobs > 0) { - cpu_id = find_next_online_cpu(pool); - cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu_id); - thread = *per_cpu_ptr(pool->cpu_comp_threads, cpu_id); - BUG_ON(!cct || !thread); - } - __queue_comp_task(__cq, cct, thread); -} - -static void run_comp_task(struct ehca_cpu_comp_task *cct) -{ - struct ehca_cq *cq; - - while (!list_empty(&cct->cq_list)) { - cq = list_entry(cct->cq_list.next, struct ehca_cq, entry); - spin_unlock_irq(&cct->task_lock); - - comp_event_callback(cq); - if (atomic_dec_and_test(&cq->nr_events)) - wake_up(&cq->wait_completion); - - spin_lock_irq(&cct->task_lock); - spin_lock(&cq->task_lock); - cq->nr_callbacks--; - if (!cq->nr_callbacks) { - list_del_init(cct->cq_list.next); - cct->cq_jobs--; - } - spin_unlock(&cq->task_lock); - } -} - -static void comp_task_park(unsigned int cpu) -{ - struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu); - struct ehca_cpu_comp_task *target; - struct task_struct *thread; - struct ehca_cq *cq, *tmp; - LIST_HEAD(list); - - spin_lock_irq(&cct->task_lock); - cct->cq_jobs = 0; - cct->active = 0; - list_splice_init(&cct->cq_list, &list); - spin_unlock_irq(&cct->task_lock); - - cpu = find_next_online_cpu(pool); - target = per_cpu_ptr(pool->cpu_comp_tasks, cpu); - thread = *per_cpu_ptr(pool->cpu_comp_threads, cpu); - spin_lock_irq(&target->task_lock); - list_for_each_entry_safe(cq, tmp, &list, entry) { - list_del(&cq->entry); - __queue_comp_task(cq, target, thread); - } - spin_unlock_irq(&target->task_lock); -} - -static void comp_task_stop(unsigned int cpu, bool online) -{ - struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu); - - spin_lock_irq(&cct->task_lock); - cct->cq_jobs = 0; - cct->active = 0; - WARN_ON(!list_empty(&cct->cq_list)); - spin_unlock_irq(&cct->task_lock); -} - -static int comp_task_should_run(unsigned int cpu) -{ - struct ehca_cpu_comp_task *cct = per_cpu_ptr(pool->cpu_comp_tasks, cpu); - - return cct->cq_jobs; -} - -static void comp_task(unsigned int cpu) -{ - struct ehca_cpu_comp_task *cct = this_cpu_ptr(pool->cpu_comp_tasks); - int cql_empty; - - spin_lock_irq(&cct->task_lock); - cql_empty = list_empty(&cct->cq_list); - if (!cql_empty) { - __set_current_state(TASK_RUNNING); - run_comp_task(cct); - } - spin_unlock_irq(&cct->task_lock); -} - -static struct smp_hotplug_thread comp_pool_threads = { - .thread_should_run = comp_task_should_run, - .thread_fn = comp_task, - .thread_comm = "ehca_comp/%u", - .cleanup = comp_task_stop, - .park = comp_task_park, -}; - -int ehca_create_comp_pool(void) -{ - int cpu, ret = -ENOMEM; - - if (!ehca_scaling_code) - return 0; - - pool = kzalloc(sizeof(struct ehca_comp_pool), GFP_KERNEL); - if (pool == NULL) - return -ENOMEM; - - spin_lock_init(&pool->last_cpu_lock); - pool->last_cpu = cpumask_any(cpu_online_mask); - - pool->cpu_comp_tasks = alloc_percpu(struct ehca_cpu_comp_task); - if (!pool->cpu_comp_tasks) - goto out_pool; - - pool->cpu_comp_threads = alloc_percpu(struct task_struct *); - if (!pool->cpu_comp_threads) - goto out_tasks; - - for_each_present_cpu(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); - } - - comp_pool_threads.store = pool->cpu_comp_threads; - ret = smpboot_register_percpu_thread(&comp_pool_threads); - if (ret) - goto out_threads; - - pr_info("eHCA scaling code enabled\n"); - return ret; - -out_threads: - free_percpu(pool->cpu_comp_threads); -out_tasks: - free_percpu(pool->cpu_comp_tasks); -out_pool: - kfree(pool); - return ret; -} - -void ehca_destroy_comp_pool(void) -{ - if (!ehca_scaling_code) - return; - - smpboot_unregister_percpu_thread(&comp_pool_threads); - - free_percpu(pool->cpu_comp_threads); - free_percpu(pool->cpu_comp_tasks); - kfree(pool); -} |