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authorDoug Ledford <dledford@redhat.com>2015-09-11 12:52:26 -0400
committerDoug Ledford <dledford@redhat.com>2015-09-11 18:13:35 -0400
commit447e9a4d27484175a84daaa8e03d35c650f443b7 (patch)
treef6d3246670bdf7dec21d1cfb2b5cbc56c2844831 /drivers/infiniband/hw/ehca/ehca_irq.c
parentd1178cbcdcf91900ccf10a177350d7945703c151 (diff)
downloadlinux-447e9a4d27484175a84daaa8e03d35c650f443b7.tar.bz2
IB/ehca: Deprecate driver, move to staging, schedule deletion
The ehca driver is only supported on IBM machines with a custom EBus. As they have opted to build their newer machines using more industry standard technology and haven't really been pushing EBus capable machines for a while, this driver can now safely be moved to the staging area and scheduled for eventual removal. This plan was brought to IBM's attention and received their sign-off. Cc: alexs@linux.vnet.ibm.com Cc: hnguyen@de.ibm.com Cc: raisch@de.ibm.com Cc: stefan.roscher@de.ibm.com Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/hw/ehca/ehca_irq.c')
-rw-r--r--drivers/infiniband/hw/ehca/ehca_irq.c870
1 files changed, 0 insertions, 870 deletions
diff --git a/drivers/infiniband/hw/ehca/ehca_irq.c b/drivers/infiniband/hw/ehca/ehca_irq.c
deleted file mode 100644
index 8615d7cf7e01..000000000000
--- a/drivers/infiniband/hw/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);
-}