From 91cf21ec6d04db21ab51d47014fd9970b5bd9861 Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Wed, 14 Apr 2021 19:07:59 +0200 Subject: scsi: zfcp: Remove unneeded INIT_LIST_HEAD() for FSF requests INIT_LIST_HEAD() is only needed for actual list heads, while req->list is used as a list entry. Note that when the error path in zfcp_fsf_req_send() removes the request from the adapter's list of pending requests, it actually looks up the request from the zfcp_reqlist - rather than just calling list_del(). So there's no risk of us calling list_del() on a request that hasn't been added to any list yet. Link: https://lore.kernel.org/r/254dc0ae28dccc43ab0b1079ef2c8dcb5fe1d2e4.1618417667.git.bblock@linux.ibm.com Reviewed-by: Benjamin Block Reviewed-by: Steffen Maier Signed-off-by: Julian Wiedmann Signed-off-by: Benjamin Block Signed-off-by: Martin K. Petersen --- drivers/s390/scsi/zfcp_fsf.c | 1 - 1 file changed, 1 deletion(-) (limited to 'drivers/s390') diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c index 485028324eae..2e4804ef2fb9 100644 --- a/drivers/s390/scsi/zfcp_fsf.c +++ b/drivers/s390/scsi/zfcp_fsf.c @@ -846,7 +846,6 @@ static struct zfcp_fsf_req *zfcp_fsf_req_create(struct zfcp_qdio *qdio, if (adapter->req_no == 0) adapter->req_no++; - INIT_LIST_HEAD(&req->list); timer_setup(&req->timer, NULL, 0); init_completion(&req->completion); -- cgit 1.4.1 From 8824db894dd1da48bad363612577ef410a5d1828 Mon Sep 17 00:00:00 2001 From: Yevhen Viktorov Date: Wed, 14 Apr 2021 19:08:00 +0200 Subject: scsi: zfcp: Fix indentation coding style issue Code indentation should use tabs where possible. Link: https://lore.kernel.org/r/e8a15a2f3d64e2e76a214647cfd4fe23d370b165.1618417667.git.bblock@linux.ibm.com Signed-off-by: Yevhen Viktorov Signed-off-by: Steffen Maier Signed-off-by: Benjamin Block Signed-off-by: Martin K. Petersen --- drivers/s390/scsi/zfcp_def.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/s390') diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h index 26c89c232ef2..94de55304a02 100644 --- a/drivers/s390/scsi/zfcp_def.h +++ b/drivers/s390/scsi/zfcp_def.h @@ -156,7 +156,7 @@ struct zfcp_adapter { u32 fsf_lic_version; u32 adapter_features; /* FCP channel features */ u32 connection_features; /* host connection features */ - u32 hardware_version; /* of FCP channel */ + u32 hardware_version; /* of FCP channel */ u32 fc_security_algorithms; /* of FCP channel */ u32 fc_security_algorithms_old; /* of FCP channel */ u16 timer_ticks; /* time int for a tick */ @@ -180,7 +180,7 @@ struct zfcp_adapter { rwlock_t erp_lock; wait_queue_head_t erp_done_wqh; struct zfcp_erp_action erp_action; /* pending error recovery */ - atomic_t erp_counter; + atomic_t erp_counter; u32 erp_total_count; /* total nr of enqueued erp actions */ u32 erp_low_mem_count; /* nr of erp actions waiting @@ -217,7 +217,7 @@ struct zfcp_port { u32 d_id; /* D_ID */ u32 handle; /* handle assigned by FSF */ struct zfcp_erp_action erp_action; /* pending error recovery */ - atomic_t erp_counter; + atomic_t erp_counter; u32 maxframe_size; u32 supported_classes; u32 connection_info; -- cgit 1.4.1 From ab1fa88062f8d1d9e8947719b8ed3ab48a60476c Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Wed, 14 Apr 2021 19:08:01 +0200 Subject: scsi: zfcp: Fix sysfs roll-back on error in zfcp_adapter_enqueue() When zfcp_adapter_enqueue() fails to create the zfcp_sysfs_adapter_attrs group, it calls zfcp_adapter_unregister() to tear down the adapter state again. This then unconditionally attempts to remove the zfcp_sysfs_adapter_attrs group, resulting in a "group not found" WARN from sysfs code. Avoid this by copying most of zfcp_adapter_unregister() into the error path, allowing for more fine-granular roll-back. Then skip the sysfs tear-down steps if we haven't progressed this far in the initialization. Link: https://lore.kernel.org/r/790922cc3af075795fff9a4b787e6bda19bdb3be.1618417667.git.bblock@linux.ibm.com Reviewed-by: Benjamin Block Reviewed-by: Steffen Maier Signed-off-by: Julian Wiedmann Signed-off-by: Benjamin Block Signed-off-by: Martin K. Petersen --- drivers/s390/scsi/zfcp_aux.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) (limited to 'drivers/s390') diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c index 768873dd55b8..abad77694e72 100644 --- a/drivers/s390/scsi/zfcp_aux.c +++ b/drivers/s390/scsi/zfcp_aux.c @@ -418,7 +418,7 @@ struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device) goto failed; if (zfcp_diag_sysfs_setup(adapter)) - goto failed; + goto err_diag_sysfs; /* report size limit per scatter-gather segment */ adapter->ccw_device->dev.dma_parms = &adapter->dma_parms; @@ -427,8 +427,24 @@ struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device) return adapter; +err_diag_sysfs: + sysfs_remove_group(&ccw_device->dev.kobj, &zfcp_sysfs_adapter_attrs); failed: - zfcp_adapter_unregister(adapter); + /* TODO: make this more fine-granular */ + cancel_delayed_work_sync(&adapter->scan_work); + cancel_work_sync(&adapter->stat_work); + cancel_work_sync(&adapter->ns_up_work); + cancel_work_sync(&adapter->version_change_lost_work); + zfcp_destroy_adapter_work_queue(adapter); + + zfcp_fc_wka_ports_force_offline(adapter->gs); + zfcp_scsi_adapter_unregister(adapter); + + zfcp_erp_thread_kill(adapter); + zfcp_dbf_adapter_unregister(adapter); + zfcp_qdio_destroy(adapter->qdio); + + zfcp_ccw_adapter_put(adapter); /* final put to release */ return ERR_PTR(-ENOMEM); } -- cgit 1.4.1 From 20540a5645f00015ca8eb968b98d62a1b275ceb8 Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Wed, 14 Apr 2021 19:08:02 +0200 Subject: scsi: zfcp: Clean up sysfs code for SFP diagnostics The error path from zfcp_adapter_enqueue() no longer attempts to remove the diagnostics attributes if they haven't been created yet. So remove the manual 'sysfs_established' guard for this case, and use device_add_groups() to add all adapter-related sysfs attributes in one go. Link: https://lore.kernel.org/r/37a97537f675d643006271f37723c346189b6eec.1618417667.git.bblock@linux.ibm.com Reviewed-by: Benjamin Block Reviewed-by: Steffen Maier Signed-off-by: Julian Wiedmann Signed-off-by: Benjamin Block Signed-off-by: Martin K. Petersen --- drivers/s390/scsi/zfcp_aux.c | 14 ++++---------- drivers/s390/scsi/zfcp_diag.c | 42 ------------------------------------------ drivers/s390/scsi/zfcp_diag.h | 7 ------- drivers/s390/scsi/zfcp_ext.h | 4 ++-- drivers/s390/scsi/zfcp_sysfs.c | 10 ++++++++-- 5 files changed, 14 insertions(+), 63 deletions(-) (limited to 'drivers/s390') diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c index abad77694e72..fd2f1c31bd21 100644 --- a/drivers/s390/scsi/zfcp_aux.c +++ b/drivers/s390/scsi/zfcp_aux.c @@ -413,12 +413,8 @@ struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device) dev_set_drvdata(&ccw_device->dev, adapter); - if (sysfs_create_group(&ccw_device->dev.kobj, - &zfcp_sysfs_adapter_attrs)) - goto failed; - - if (zfcp_diag_sysfs_setup(adapter)) - goto err_diag_sysfs; + if (device_add_groups(&ccw_device->dev, zfcp_sysfs_adapter_attr_groups)) + goto err_sysfs; /* report size limit per scatter-gather segment */ adapter->ccw_device->dev.dma_parms = &adapter->dma_parms; @@ -427,8 +423,7 @@ struct zfcp_adapter *zfcp_adapter_enqueue(struct ccw_device *ccw_device) return adapter; -err_diag_sysfs: - sysfs_remove_group(&ccw_device->dev.kobj, &zfcp_sysfs_adapter_attrs); +err_sysfs: failed: /* TODO: make this more fine-granular */ cancel_delayed_work_sync(&adapter->scan_work); @@ -460,8 +455,7 @@ void zfcp_adapter_unregister(struct zfcp_adapter *adapter) zfcp_fc_wka_ports_force_offline(adapter->gs); zfcp_scsi_adapter_unregister(adapter); - zfcp_diag_sysfs_destroy(adapter); - sysfs_remove_group(&cdev->dev.kobj, &zfcp_sysfs_adapter_attrs); + device_remove_groups(&cdev->dev, zfcp_sysfs_adapter_attr_groups); zfcp_erp_thread_kill(adapter); zfcp_dbf_adapter_unregister(adapter); diff --git a/drivers/s390/scsi/zfcp_diag.c b/drivers/s390/scsi/zfcp_diag.c index 67a8f4e57db1..4d2d89d9c15a 100644 --- a/drivers/s390/scsi/zfcp_diag.c +++ b/drivers/s390/scsi/zfcp_diag.c @@ -10,8 +10,6 @@ #include #include #include -#include -#include #include #include @@ -79,46 +77,6 @@ void zfcp_diag_adapter_free(struct zfcp_adapter *const adapter) adapter->diagnostics = NULL; } -/** - * zfcp_diag_sysfs_setup() - Setup the sysfs-group for adapter-diagnostics. - * @adapter: target adapter to which the group should be added. - * - * Return: 0 on success; Something else otherwise (see sysfs_create_group()). - */ -int zfcp_diag_sysfs_setup(struct zfcp_adapter *const adapter) -{ - int rc = sysfs_create_group(&adapter->ccw_device->dev.kobj, - &zfcp_sysfs_diag_attr_group); - if (rc == 0) - adapter->diagnostics->sysfs_established = 1; - - return rc; -} - -/** - * zfcp_diag_sysfs_destroy() - Remove the sysfs-group for adapter-diagnostics. - * @adapter: target adapter from which the group should be removed. - */ -void zfcp_diag_sysfs_destroy(struct zfcp_adapter *const adapter) -{ - if (adapter->diagnostics == NULL || - !adapter->diagnostics->sysfs_established) - return; - - /* - * We need this state-handling so we can prevent warnings being printed - * on the kernel-console in case we have to abort a halfway done - * zfcp_adapter_enqueue(), in which the sysfs-group was not yet - * established. sysfs_remove_group() does this checking as well, but - * still prints a warning in case we try to remove a group that has not - * been established before - */ - adapter->diagnostics->sysfs_established = 0; - sysfs_remove_group(&adapter->ccw_device->dev.kobj, - &zfcp_sysfs_diag_attr_group); -} - - /** * zfcp_diag_update_xdata() - Update a diagnostics buffer. * @hdr: the meta data to update. diff --git a/drivers/s390/scsi/zfcp_diag.h b/drivers/s390/scsi/zfcp_diag.h index 3852367f15f6..da55133da8fe 100644 --- a/drivers/s390/scsi/zfcp_diag.h +++ b/drivers/s390/scsi/zfcp_diag.h @@ -40,8 +40,6 @@ struct zfcp_diag_header { /** * struct zfcp_diag_adapter - central storage for all diagnostics concerning an * adapter. - * @sysfs_established: flag showing that the associated sysfs-group was created - * during run of zfcp_adapter_enqueue(). * @max_age: maximum age of data in diagnostic buffers before they need to be * refreshed (in ms). * @port_data: data retrieved using exchange port data. @@ -52,8 +50,6 @@ struct zfcp_diag_header { * @config_data.data: cached QTCB Bottom of command exchange config data. */ struct zfcp_diag_adapter { - u64 sysfs_established :1; - unsigned long max_age; struct zfcp_diag_adapter_port_data { @@ -69,9 +65,6 @@ struct zfcp_diag_adapter { int zfcp_diag_adapter_setup(struct zfcp_adapter *const adapter); void zfcp_diag_adapter_free(struct zfcp_adapter *const adapter); -int zfcp_diag_sysfs_setup(struct zfcp_adapter *const adapter); -void zfcp_diag_sysfs_destroy(struct zfcp_adapter *const adapter); - void zfcp_diag_update_xdata(struct zfcp_diag_header *const hdr, const void *const data, const bool incomplete); diff --git a/drivers/s390/scsi/zfcp_ext.h b/drivers/s390/scsi/zfcp_ext.h index 58879213f225..6bc96d70254d 100644 --- a/drivers/s390/scsi/zfcp_ext.h +++ b/drivers/s390/scsi/zfcp_ext.h @@ -11,6 +11,7 @@ #define ZFCP_EXT_H #include +#include #include #include "zfcp_def.h" #include "zfcp_fc.h" @@ -179,13 +180,12 @@ extern void zfcp_scsi_shost_update_port_data( const struct fsf_qtcb_bottom_port *const bottom); /* zfcp_sysfs.c */ +extern const struct attribute_group *zfcp_sysfs_adapter_attr_groups[]; extern const struct attribute_group *zfcp_unit_attr_groups[]; -extern struct attribute_group zfcp_sysfs_adapter_attrs; extern const struct attribute_group *zfcp_port_attr_groups[]; extern struct mutex zfcp_sysfs_port_units_mutex; extern struct device_attribute *zfcp_sysfs_sdev_attrs[]; extern struct device_attribute *zfcp_sysfs_shost_attrs[]; -extern const struct attribute_group zfcp_sysfs_diag_attr_group; bool zfcp_sysfs_port_is_removing(const struct zfcp_port *const port); /* zfcp_unit.c */ diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c index 8d9662e8b717..f76946dcbd59 100644 --- a/drivers/s390/scsi/zfcp_sysfs.c +++ b/drivers/s390/scsi/zfcp_sysfs.c @@ -435,7 +435,7 @@ static struct attribute *zfcp_adapter_attrs[] = { NULL }; -struct attribute_group zfcp_sysfs_adapter_attrs = { +static const struct attribute_group zfcp_sysfs_adapter_attr_group = { .attrs = zfcp_adapter_attrs, }; @@ -906,7 +906,13 @@ static struct attribute *zfcp_sysfs_diag_attrs[] = { NULL, }; -const struct attribute_group zfcp_sysfs_diag_attr_group = { +static const struct attribute_group zfcp_sysfs_diag_attr_group = { .name = "diagnostics", .attrs = zfcp_sysfs_diag_attrs, }; + +const struct attribute_group *zfcp_sysfs_adapter_attr_groups[] = { + &zfcp_sysfs_adapter_attr_group, + &zfcp_sysfs_diag_attr_group, + NULL, +}; -- cgit 1.4.1 From be46e39ae3be8cde8dd0d09d7c0f8eed443747ab Mon Sep 17 00:00:00 2001 From: Qinglang Miao Date: Wed, 14 Apr 2021 19:08:03 +0200 Subject: scsi: zfcp: Move the position of put_device() Place the put_device() call after device_unregister() in both zfcp_unit_remove() and zfcp_sysfs_port_remove_store() to make it more natural. put_device() ought to be the last time we touch the object in both functions. Add comments after put_device() to make code clearer. Link: https://lore.kernel.org/r/0a568c7733ba0f1dde28b0c663b90270d44dd540.1618417667.git.bblock@linux.ibm.com Suggested-by: Steffen Maier Suggested-by: Benjamin Block Signed-off-by: Qinglang Miao Signed-off-by: Benjamin Block Signed-off-by: Martin K. Petersen --- drivers/s390/scsi/zfcp_sysfs.c | 4 ++-- drivers/s390/scsi/zfcp_unit.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/s390') diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c index f76946dcbd59..544efd4c42f0 100644 --- a/drivers/s390/scsi/zfcp_sysfs.c +++ b/drivers/s390/scsi/zfcp_sysfs.c @@ -327,10 +327,10 @@ static ssize_t zfcp_sysfs_port_remove_store(struct device *dev, list_del(&port->list); write_unlock_irq(&adapter->port_list_lock); - put_device(&port->dev); - zfcp_erp_port_shutdown(port, 0, "syprs_1"); device_unregister(&port->dev); + + put_device(&port->dev); /* undo zfcp_get_port_by_wwpn() */ out: zfcp_ccw_adapter_put(adapter); return retval ? retval : (ssize_t) count; diff --git a/drivers/s390/scsi/zfcp_unit.c b/drivers/s390/scsi/zfcp_unit.c index e67bf7388cae..59333f0257a8 100644 --- a/drivers/s390/scsi/zfcp_unit.c +++ b/drivers/s390/scsi/zfcp_unit.c @@ -255,9 +255,9 @@ int zfcp_unit_remove(struct zfcp_port *port, u64 fcp_lun) scsi_device_put(sdev); } - put_device(&unit->dev); - device_unregister(&unit->dev); + put_device(&unit->dev); /* undo _zfcp_unit_find() */ + return 0; } -- cgit 1.4.1 From b3f0a1ee9e3986106869eec49b61b40abdccdcf7 Mon Sep 17 00:00:00 2001 From: Julian Wiedmann Date: Wed, 14 Apr 2021 19:08:04 +0200 Subject: scsi: zfcp: Lift Request Queue tasklet & timer from qdio The qdio layer currently provides its own infrastructure to scan for Request Queue completions & to report them to the device driver. This comes with several drawbacks - having an async tasklet & timer construct in qdio introduces additional lifetime complexity, and makes it harder to integrate them with the rest of the device driver. The timeouts are also currently hard-coded, and can't be tweaked without affecting other qdio drivers (ie. qeth). But due to recent enhancements to the qdio layer, zfcp can actually take full control of the Request Queue completion processing. It merely needs to opt-out from the qdio layer mechanisms by setting the scan_threshold to 0, and then use qdio_inspect_queue() to scan for completions. So re-implement the tasklet & timer mechanism in zfcp, while initially copying the scan conditions from qdio's handle_outbound() and qdio_outbound_tasklet(). One minor behavioural change is that zfcp_qdio_send() will unconditionally reduce the timeout to 1 HZ, rather than leaving it at 10 Hz if it was last armed by the tasklet. This just makes things more consistent. Also note that we can drop a lot of the accumulated cruft in qdio_outbound_tasklet(), as zfcp doesn't even use PCI interrupt requests any longer. This also slightly touches the Response Queue processing, as qdio_get_next_buffers() will no longer implicitly scan for Request Queue completions. So complete the migration to qdio_inspect_queue() here as well and make the tasklet_schedule() visible. Link: https://lore.kernel.org/r/018d3ddd029f8d6ac00cf4184880288c637c4fd1.1618417667.git.bblock@linux.ibm.com Reviewed-by: Benjamin Block Signed-off-by: Julian Wiedmann Signed-off-by: Benjamin Block Signed-off-by: Martin K. Petersen --- drivers/s390/scsi/zfcp_qdio.c | 68 +++++++++++++++++++++++++++++++++++-------- drivers/s390/scsi/zfcp_qdio.h | 5 ++++ 2 files changed, 61 insertions(+), 12 deletions(-) (limited to 'drivers/s390') diff --git a/drivers/s390/scsi/zfcp_qdio.c b/drivers/s390/scsi/zfcp_qdio.c index 23ab16d65f2a..16a332d501e7 100644 --- a/drivers/s390/scsi/zfcp_qdio.c +++ b/drivers/s390/scsi/zfcp_qdio.c @@ -20,6 +20,9 @@ static bool enable_multibuffer = true; module_param_named(datarouter, enable_multibuffer, bool, 0400); MODULE_PARM_DESC(datarouter, "Enable hardware data router support (default on)"); +#define ZFCP_QDIO_REQUEST_RESCAN_MSECS (MSEC_PER_SEC * 10) +#define ZFCP_QDIO_REQUEST_SCAN_MSECS MSEC_PER_SEC + static void zfcp_qdio_handler_error(struct zfcp_qdio *qdio, char *dbftag, unsigned int qdio_err) { @@ -70,15 +73,41 @@ static void zfcp_qdio_int_req(struct ccw_device *cdev, unsigned int qdio_err, zfcp_qdio_handler_error(qdio, "qdireq1", qdio_err); return; } +} - /* cleanup all SBALs being program-owned now */ - zfcp_qdio_zero_sbals(qdio->req_q, idx, count); +static void zfcp_qdio_request_tasklet(struct tasklet_struct *tasklet) +{ + struct zfcp_qdio *qdio = from_tasklet(qdio, tasklet, request_tasklet); + struct ccw_device *cdev = qdio->adapter->ccw_device; + unsigned int start, error; + int completed; - spin_lock_irq(&qdio->stat_lock); - zfcp_qdio_account(qdio); - spin_unlock_irq(&qdio->stat_lock); - atomic_add(count, &qdio->req_q_free); - wake_up(&qdio->req_q_wq); + completed = qdio_inspect_queue(cdev, 0, false, &start, &error); + if (completed > 0) { + if (error) { + zfcp_qdio_handler_error(qdio, "qdreqt1", error); + } else { + /* cleanup all SBALs being program-owned now */ + zfcp_qdio_zero_sbals(qdio->req_q, start, completed); + + spin_lock_irq(&qdio->stat_lock); + zfcp_qdio_account(qdio); + spin_unlock_irq(&qdio->stat_lock); + atomic_add(completed, &qdio->req_q_free); + wake_up(&qdio->req_q_wq); + } + } + + if (atomic_read(&qdio->req_q_free) < QDIO_MAX_BUFFERS_PER_Q) + timer_reduce(&qdio->request_timer, + jiffies + msecs_to_jiffies(ZFCP_QDIO_REQUEST_RESCAN_MSECS)); +} + +static void zfcp_qdio_request_timer(struct timer_list *timer) +{ + struct zfcp_qdio *qdio = from_timer(qdio, timer, request_timer); + + tasklet_schedule(&qdio->request_tasklet); } static void zfcp_qdio_int_resp(struct ccw_device *cdev, unsigned int qdio_err, @@ -139,8 +168,11 @@ static void zfcp_qdio_irq_tasklet(struct tasklet_struct *tasklet) unsigned int start, error; int completed; - /* Check the Response Queue, and kick off the Request Queue tasklet: */ - completed = qdio_get_next_buffers(cdev, 0, &start, &error); + if (atomic_read(&qdio->req_q_free) < QDIO_MAX_BUFFERS_PER_Q) + tasklet_schedule(&qdio->request_tasklet); + + /* Check the Response Queue: */ + completed = qdio_inspect_queue(cdev, 0, true, &start, &error); if (completed < 0) return; if (completed > 0) @@ -286,7 +318,7 @@ int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) /* * This should actually be a spin_lock_bh(stat_lock), to protect against - * zfcp_qdio_int_req() in tasklet context. + * Request Queue completion processing in tasklet context. * But we can't do so (and are safe), as we always get called with IRQs * disabled by spin_lock_irq[save](req_q_lock). */ @@ -308,6 +340,12 @@ int zfcp_qdio_send(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req) return retval; } + if (atomic_read(&qdio->req_q_free) <= 2 * ZFCP_QDIO_MAX_SBALS_PER_REQ) + tasklet_schedule(&qdio->request_tasklet); + else + timer_reduce(&qdio->request_timer, + jiffies + msecs_to_jiffies(ZFCP_QDIO_REQUEST_SCAN_MSECS)); + /* account for transferred buffers */ qdio->req_q_idx += sbal_number; qdio->req_q_idx %= QDIO_MAX_BUFFERS_PER_Q; @@ -368,6 +406,8 @@ void zfcp_qdio_close(struct zfcp_qdio *qdio) wake_up(&qdio->req_q_wq); tasklet_disable(&qdio->irq_tasklet); + tasklet_disable(&qdio->request_tasklet); + del_timer_sync(&qdio->request_timer); qdio_stop_irq(adapter->ccw_device); qdio_shutdown(adapter->ccw_device, QDIO_FLAG_CLEANUP_USING_CLEAR); @@ -428,8 +468,6 @@ int zfcp_qdio_open(struct zfcp_qdio *qdio) init_data.int_parm = (unsigned long) qdio; init_data.input_sbal_addr_array = input_sbals; init_data.output_sbal_addr_array = output_sbals; - init_data.scan_threshold = - QDIO_MAX_BUFFERS_PER_Q - ZFCP_QDIO_MAX_SBALS_PER_REQ * 2; if (qdio_establish(cdev, &init_data)) goto failed_establish; @@ -471,6 +509,8 @@ int zfcp_qdio_open(struct zfcp_qdio *qdio) atomic_set(&qdio->req_q_free, QDIO_MAX_BUFFERS_PER_Q); atomic_or(ZFCP_STATUS_ADAPTER_QDIOUP, &qdio->adapter->status); + /* Enable processing for Request Queue completions: */ + tasklet_enable(&qdio->request_tasklet); /* Enable processing for QDIO interrupts: */ tasklet_enable(&qdio->irq_tasklet); /* This results in a qdio_start_irq(): */ @@ -494,6 +534,7 @@ void zfcp_qdio_destroy(struct zfcp_qdio *qdio) return; tasklet_kill(&qdio->irq_tasklet); + tasklet_kill(&qdio->request_tasklet); if (qdio->adapter->ccw_device) qdio_free(qdio->adapter->ccw_device); @@ -520,8 +561,11 @@ int zfcp_qdio_setup(struct zfcp_adapter *adapter) spin_lock_init(&qdio->req_q_lock); spin_lock_init(&qdio->stat_lock); + timer_setup(&qdio->request_timer, zfcp_qdio_request_timer, 0); tasklet_setup(&qdio->irq_tasklet, zfcp_qdio_irq_tasklet); + tasklet_setup(&qdio->request_tasklet, zfcp_qdio_request_tasklet); tasklet_disable(&qdio->irq_tasklet); + tasklet_disable(&qdio->request_tasklet); adapter->qdio = qdio; return 0; diff --git a/drivers/s390/scsi/zfcp_qdio.h b/drivers/s390/scsi/zfcp_qdio.h index 9c1f310db155..390706867df3 100644 --- a/drivers/s390/scsi/zfcp_qdio.h +++ b/drivers/s390/scsi/zfcp_qdio.h @@ -30,6 +30,9 @@ * @req_q_util: used for accounting * @req_q_full: queue full incidents * @req_q_wq: used to wait for SBAL availability + * @irq_tasklet: used for QDIO interrupt processing + * @request_tasklet: used for Request Queue completion processing + * @request_timer: used to trigger the Request Queue completion processing * @adapter: adapter used in conjunction with this qdio structure * @max_sbale_per_sbal: qdio limit per sbal * @max_sbale_per_req: qdio limit per request @@ -46,6 +49,8 @@ struct zfcp_qdio { atomic_t req_q_full; wait_queue_head_t req_q_wq; struct tasklet_struct irq_tasklet; + struct tasklet_struct request_tasklet; + struct timer_list request_timer; struct zfcp_adapter *adapter; u16 max_sbale_per_sbal; u16 max_sbale_per_req; -- cgit 1.4.1