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663 lines
16 KiB
663 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Serial Attached SCSI (SAS) Transport Layer initialization |
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* |
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* Copyright (C) 2005 Adaptec, Inc. All rights reserved. |
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* Copyright (C) 2005 Luben Tuikov <[email protected]> |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/init.h> |
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#include <linux/device.h> |
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#include <linux/spinlock.h> |
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#include <scsi/sas_ata.h> |
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#include <scsi/scsi_host.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_transport.h> |
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#include <scsi/scsi_transport_sas.h> |
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#include "sas_internal.h" |
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#include "scsi_sas_internal.h" |
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static struct kmem_cache *sas_task_cache; |
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static struct kmem_cache *sas_event_cache; |
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struct sas_task *sas_alloc_task(gfp_t flags) |
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{ |
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struct sas_task *task = kmem_cache_zalloc(sas_task_cache, flags); |
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if (task) { |
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spin_lock_init(&task->task_state_lock); |
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task->task_state_flags = SAS_TASK_STATE_PENDING; |
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} |
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return task; |
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} |
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EXPORT_SYMBOL_GPL(sas_alloc_task); |
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struct sas_task *sas_alloc_slow_task(gfp_t flags) |
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{ |
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struct sas_task *task = sas_alloc_task(flags); |
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struct sas_task_slow *slow = kmalloc(sizeof(*slow), flags); |
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if (!task || !slow) { |
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if (task) |
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kmem_cache_free(sas_task_cache, task); |
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kfree(slow); |
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return NULL; |
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} |
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task->slow_task = slow; |
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slow->task = task; |
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timer_setup(&slow->timer, NULL, 0); |
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init_completion(&slow->completion); |
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return task; |
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} |
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EXPORT_SYMBOL_GPL(sas_alloc_slow_task); |
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void sas_free_task(struct sas_task *task) |
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{ |
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if (task) { |
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kfree(task->slow_task); |
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kmem_cache_free(sas_task_cache, task); |
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} |
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} |
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EXPORT_SYMBOL_GPL(sas_free_task); |
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/*------------ SAS addr hash -----------*/ |
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void sas_hash_addr(u8 *hashed, const u8 *sas_addr) |
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{ |
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const u32 poly = 0x00DB2777; |
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u32 r = 0; |
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int i; |
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for (i = 0; i < SAS_ADDR_SIZE; i++) { |
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int b; |
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for (b = (SAS_ADDR_SIZE - 1); b >= 0; b--) { |
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r <<= 1; |
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if ((1 << b) & sas_addr[i]) { |
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if (!(r & 0x01000000)) |
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r ^= poly; |
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} else if (r & 0x01000000) { |
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r ^= poly; |
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} |
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} |
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} |
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hashed[0] = (r >> 16) & 0xFF; |
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hashed[1] = (r >> 8) & 0xFF; |
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hashed[2] = r & 0xFF; |
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} |
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int sas_register_ha(struct sas_ha_struct *sas_ha) |
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{ |
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char name[64]; |
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int error = 0; |
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mutex_init(&sas_ha->disco_mutex); |
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spin_lock_init(&sas_ha->phy_port_lock); |
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sas_hash_addr(sas_ha->hashed_sas_addr, sas_ha->sas_addr); |
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set_bit(SAS_HA_REGISTERED, &sas_ha->state); |
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spin_lock_init(&sas_ha->lock); |
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mutex_init(&sas_ha->drain_mutex); |
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init_waitqueue_head(&sas_ha->eh_wait_q); |
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INIT_LIST_HEAD(&sas_ha->defer_q); |
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INIT_LIST_HEAD(&sas_ha->eh_dev_q); |
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sas_ha->event_thres = SAS_PHY_SHUTDOWN_THRES; |
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error = sas_register_phys(sas_ha); |
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if (error) { |
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pr_notice("couldn't register sas phys:%d\n", error); |
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return error; |
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} |
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error = sas_register_ports(sas_ha); |
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if (error) { |
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pr_notice("couldn't register sas ports:%d\n", error); |
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goto Undo_phys; |
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} |
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error = -ENOMEM; |
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snprintf(name, sizeof(name), "%s_event_q", dev_name(sas_ha->dev)); |
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sas_ha->event_q = create_singlethread_workqueue(name); |
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if (!sas_ha->event_q) |
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goto Undo_ports; |
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snprintf(name, sizeof(name), "%s_disco_q", dev_name(sas_ha->dev)); |
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sas_ha->disco_q = create_singlethread_workqueue(name); |
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if (!sas_ha->disco_q) |
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goto Undo_event_q; |
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INIT_LIST_HEAD(&sas_ha->eh_done_q); |
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INIT_LIST_HEAD(&sas_ha->eh_ata_q); |
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return 0; |
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Undo_event_q: |
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destroy_workqueue(sas_ha->event_q); |
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Undo_ports: |
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sas_unregister_ports(sas_ha); |
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Undo_phys: |
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return error; |
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} |
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static void sas_disable_events(struct sas_ha_struct *sas_ha) |
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{ |
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/* Set the state to unregistered to avoid further unchained |
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* events to be queued, and flush any in-progress drainers |
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*/ |
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mutex_lock(&sas_ha->drain_mutex); |
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spin_lock_irq(&sas_ha->lock); |
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clear_bit(SAS_HA_REGISTERED, &sas_ha->state); |
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spin_unlock_irq(&sas_ha->lock); |
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__sas_drain_work(sas_ha); |
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mutex_unlock(&sas_ha->drain_mutex); |
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} |
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int sas_unregister_ha(struct sas_ha_struct *sas_ha) |
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{ |
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sas_disable_events(sas_ha); |
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sas_unregister_ports(sas_ha); |
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/* flush unregistration work */ |
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mutex_lock(&sas_ha->drain_mutex); |
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__sas_drain_work(sas_ha); |
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mutex_unlock(&sas_ha->drain_mutex); |
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destroy_workqueue(sas_ha->disco_q); |
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destroy_workqueue(sas_ha->event_q); |
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return 0; |
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} |
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static int sas_get_linkerrors(struct sas_phy *phy) |
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{ |
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if (scsi_is_sas_phy_local(phy)) { |
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
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struct sas_internal *i = |
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to_sas_internal(sas_ha->core.shost->transportt); |
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return i->dft->lldd_control_phy(asd_phy, PHY_FUNC_GET_EVENTS, NULL); |
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} |
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return sas_smp_get_phy_events(phy); |
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} |
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int sas_try_ata_reset(struct asd_sas_phy *asd_phy) |
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{ |
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struct domain_device *dev = NULL; |
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/* try to route user requested link resets through libata */ |
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if (asd_phy->port) |
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dev = asd_phy->port->port_dev; |
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/* validate that dev has been probed */ |
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if (dev) |
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dev = sas_find_dev_by_rphy(dev->rphy); |
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if (dev && dev_is_sata(dev)) { |
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sas_ata_schedule_reset(dev); |
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sas_ata_wait_eh(dev); |
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return 0; |
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} |
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return -ENODEV; |
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} |
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/* |
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* transport_sas_phy_reset - reset a phy and permit libata to manage the link |
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* |
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* phy reset request via sysfs in host workqueue context so we know we |
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* can block on eh and safely traverse the domain_device topology |
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*/ |
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static int transport_sas_phy_reset(struct sas_phy *phy, int hard_reset) |
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{ |
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enum phy_func reset_type; |
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if (hard_reset) |
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reset_type = PHY_FUNC_HARD_RESET; |
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else |
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reset_type = PHY_FUNC_LINK_RESET; |
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if (scsi_is_sas_phy_local(phy)) { |
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
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struct sas_internal *i = |
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to_sas_internal(sas_ha->core.shost->transportt); |
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if (!hard_reset && sas_try_ata_reset(asd_phy) == 0) |
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return 0; |
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return i->dft->lldd_control_phy(asd_phy, reset_type, NULL); |
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} else { |
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struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); |
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struct domain_device *ddev = sas_find_dev_by_rphy(rphy); |
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struct domain_device *ata_dev = sas_ex_to_ata(ddev, phy->number); |
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if (ata_dev && !hard_reset) { |
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sas_ata_schedule_reset(ata_dev); |
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sas_ata_wait_eh(ata_dev); |
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return 0; |
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} else |
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return sas_smp_phy_control(ddev, phy->number, reset_type, NULL); |
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} |
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} |
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static int sas_phy_enable(struct sas_phy *phy, int enable) |
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{ |
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int ret; |
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enum phy_func cmd; |
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if (enable) |
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cmd = PHY_FUNC_LINK_RESET; |
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else |
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cmd = PHY_FUNC_DISABLE; |
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if (scsi_is_sas_phy_local(phy)) { |
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
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struct sas_internal *i = |
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to_sas_internal(sas_ha->core.shost->transportt); |
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if (enable) |
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ret = transport_sas_phy_reset(phy, 0); |
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else |
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ret = i->dft->lldd_control_phy(asd_phy, cmd, NULL); |
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} else { |
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struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); |
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struct domain_device *ddev = sas_find_dev_by_rphy(rphy); |
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if (enable) |
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ret = transport_sas_phy_reset(phy, 0); |
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else |
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ret = sas_smp_phy_control(ddev, phy->number, cmd, NULL); |
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} |
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return ret; |
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} |
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int sas_phy_reset(struct sas_phy *phy, int hard_reset) |
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{ |
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int ret; |
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enum phy_func reset_type; |
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if (!phy->enabled) |
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return -ENODEV; |
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if (hard_reset) |
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reset_type = PHY_FUNC_HARD_RESET; |
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else |
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reset_type = PHY_FUNC_LINK_RESET; |
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if (scsi_is_sas_phy_local(phy)) { |
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
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struct sas_internal *i = |
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to_sas_internal(sas_ha->core.shost->transportt); |
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ret = i->dft->lldd_control_phy(asd_phy, reset_type, NULL); |
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} else { |
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struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); |
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struct domain_device *ddev = sas_find_dev_by_rphy(rphy); |
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ret = sas_smp_phy_control(ddev, phy->number, reset_type, NULL); |
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} |
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return ret; |
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} |
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int sas_set_phy_speed(struct sas_phy *phy, |
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struct sas_phy_linkrates *rates) |
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{ |
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int ret; |
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if ((rates->minimum_linkrate && |
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rates->minimum_linkrate > phy->maximum_linkrate) || |
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(rates->maximum_linkrate && |
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rates->maximum_linkrate < phy->minimum_linkrate)) |
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return -EINVAL; |
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if (rates->minimum_linkrate && |
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rates->minimum_linkrate < phy->minimum_linkrate_hw) |
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rates->minimum_linkrate = phy->minimum_linkrate_hw; |
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if (rates->maximum_linkrate && |
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rates->maximum_linkrate > phy->maximum_linkrate_hw) |
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rates->maximum_linkrate = phy->maximum_linkrate_hw; |
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if (scsi_is_sas_phy_local(phy)) { |
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
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struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); |
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struct asd_sas_phy *asd_phy = sas_ha->sas_phy[phy->number]; |
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struct sas_internal *i = |
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to_sas_internal(sas_ha->core.shost->transportt); |
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ret = i->dft->lldd_control_phy(asd_phy, PHY_FUNC_SET_LINK_RATE, |
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rates); |
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} else { |
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struct sas_rphy *rphy = dev_to_rphy(phy->dev.parent); |
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struct domain_device *ddev = sas_find_dev_by_rphy(rphy); |
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ret = sas_smp_phy_control(ddev, phy->number, |
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PHY_FUNC_LINK_RESET, rates); |
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} |
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return ret; |
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} |
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void sas_prep_resume_ha(struct sas_ha_struct *ha) |
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{ |
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int i; |
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set_bit(SAS_HA_REGISTERED, &ha->state); |
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/* clear out any stale link events/data from the suspension path */ |
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for (i = 0; i < ha->num_phys; i++) { |
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struct asd_sas_phy *phy = ha->sas_phy[i]; |
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memset(phy->attached_sas_addr, 0, SAS_ADDR_SIZE); |
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phy->frame_rcvd_size = 0; |
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} |
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} |
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EXPORT_SYMBOL(sas_prep_resume_ha); |
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static int phys_suspended(struct sas_ha_struct *ha) |
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{ |
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int i, rc = 0; |
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for (i = 0; i < ha->num_phys; i++) { |
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struct asd_sas_phy *phy = ha->sas_phy[i]; |
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if (phy->suspended) |
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rc++; |
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} |
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return rc; |
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} |
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void sas_resume_ha(struct sas_ha_struct *ha) |
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{ |
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const unsigned long tmo = msecs_to_jiffies(25000); |
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int i; |
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/* deform ports on phys that did not resume |
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* at this point we may be racing the phy coming back (as posted |
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* by the lldd). So we post the event and once we are in the |
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* libsas context check that the phy remains suspended before |
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* tearing it down. |
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*/ |
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i = phys_suspended(ha); |
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if (i) |
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dev_info(ha->dev, "waiting up to 25 seconds for %d phy%s to resume\n", |
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i, i > 1 ? "s" : ""); |
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wait_event_timeout(ha->eh_wait_q, phys_suspended(ha) == 0, tmo); |
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for (i = 0; i < ha->num_phys; i++) { |
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struct asd_sas_phy *phy = ha->sas_phy[i]; |
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if (phy->suspended) { |
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dev_warn(&phy->phy->dev, "resume timeout\n"); |
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sas_notify_phy_event(phy, PHYE_RESUME_TIMEOUT, |
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GFP_KERNEL); |
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} |
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} |
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/* all phys are back up or timed out, turn on i/o so we can |
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* flush out disks that did not return |
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*/ |
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scsi_unblock_requests(ha->core.shost); |
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sas_drain_work(ha); |
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} |
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EXPORT_SYMBOL(sas_resume_ha); |
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void sas_suspend_ha(struct sas_ha_struct *ha) |
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{ |
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int i; |
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sas_disable_events(ha); |
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scsi_block_requests(ha->core.shost); |
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for (i = 0; i < ha->num_phys; i++) { |
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struct asd_sas_port *port = ha->sas_port[i]; |
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sas_discover_event(port, DISCE_SUSPEND); |
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} |
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/* flush suspend events while unregistered */ |
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mutex_lock(&ha->drain_mutex); |
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__sas_drain_work(ha); |
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mutex_unlock(&ha->drain_mutex); |
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} |
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EXPORT_SYMBOL(sas_suspend_ha); |
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static void sas_phy_release(struct sas_phy *phy) |
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{ |
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kfree(phy->hostdata); |
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phy->hostdata = NULL; |
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} |
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static void phy_reset_work(struct work_struct *work) |
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{ |
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struct sas_phy_data *d = container_of(work, typeof(*d), reset_work.work); |
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d->reset_result = transport_sas_phy_reset(d->phy, d->hard_reset); |
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} |
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static void phy_enable_work(struct work_struct *work) |
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{ |
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struct sas_phy_data *d = container_of(work, typeof(*d), enable_work.work); |
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d->enable_result = sas_phy_enable(d->phy, d->enable); |
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} |
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static int sas_phy_setup(struct sas_phy *phy) |
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{ |
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struct sas_phy_data *d = kzalloc(sizeof(*d), GFP_KERNEL); |
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if (!d) |
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return -ENOMEM; |
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mutex_init(&d->event_lock); |
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INIT_SAS_WORK(&d->reset_work, phy_reset_work); |
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INIT_SAS_WORK(&d->enable_work, phy_enable_work); |
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d->phy = phy; |
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phy->hostdata = d; |
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return 0; |
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} |
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static int queue_phy_reset(struct sas_phy *phy, int hard_reset) |
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{ |
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
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struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
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struct sas_phy_data *d = phy->hostdata; |
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int rc; |
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if (!d) |
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return -ENOMEM; |
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/* libsas workqueue coordinates ata-eh reset with discovery */ |
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mutex_lock(&d->event_lock); |
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d->reset_result = 0; |
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d->hard_reset = hard_reset; |
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spin_lock_irq(&ha->lock); |
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sas_queue_work(ha, &d->reset_work); |
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spin_unlock_irq(&ha->lock); |
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rc = sas_drain_work(ha); |
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if (rc == 0) |
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rc = d->reset_result; |
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mutex_unlock(&d->event_lock); |
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return rc; |
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} |
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static int queue_phy_enable(struct sas_phy *phy, int enable) |
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{ |
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struct Scsi_Host *shost = dev_to_shost(phy->dev.parent); |
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struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost); |
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struct sas_phy_data *d = phy->hostdata; |
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int rc; |
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if (!d) |
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return -ENOMEM; |
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/* libsas workqueue coordinates ata-eh reset with discovery */ |
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mutex_lock(&d->event_lock); |
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d->enable_result = 0; |
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d->enable = enable; |
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spin_lock_irq(&ha->lock); |
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sas_queue_work(ha, &d->enable_work); |
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spin_unlock_irq(&ha->lock); |
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rc = sas_drain_work(ha); |
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if (rc == 0) |
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rc = d->enable_result; |
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mutex_unlock(&d->event_lock); |
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return rc; |
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} |
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static struct sas_function_template sft = { |
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.phy_enable = queue_phy_enable, |
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.phy_reset = queue_phy_reset, |
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.phy_setup = sas_phy_setup, |
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.phy_release = sas_phy_release, |
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.set_phy_speed = sas_set_phy_speed, |
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.get_linkerrors = sas_get_linkerrors, |
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.smp_handler = sas_smp_handler, |
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}; |
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static inline ssize_t phy_event_threshold_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct Scsi_Host *shost = class_to_shost(dev); |
|
struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost); |
|
|
|
return scnprintf(buf, PAGE_SIZE, "%u\n", sha->event_thres); |
|
} |
|
|
|
static inline ssize_t phy_event_threshold_store(struct device *dev, |
|
struct device_attribute *attr, |
|
const char *buf, size_t count) |
|
{ |
|
struct Scsi_Host *shost = class_to_shost(dev); |
|
struct sas_ha_struct *sha = SHOST_TO_SAS_HA(shost); |
|
|
|
sha->event_thres = simple_strtol(buf, NULL, 10); |
|
|
|
/* threshold cannot be set too small */ |
|
if (sha->event_thres < 32) |
|
sha->event_thres = 32; |
|
|
|
return count; |
|
} |
|
|
|
DEVICE_ATTR(phy_event_threshold, |
|
S_IRUGO|S_IWUSR, |
|
phy_event_threshold_show, |
|
phy_event_threshold_store); |
|
EXPORT_SYMBOL_GPL(dev_attr_phy_event_threshold); |
|
|
|
struct scsi_transport_template * |
|
sas_domain_attach_transport(struct sas_domain_function_template *dft) |
|
{ |
|
struct scsi_transport_template *stt = sas_attach_transport(&sft); |
|
struct sas_internal *i; |
|
|
|
if (!stt) |
|
return stt; |
|
|
|
i = to_sas_internal(stt); |
|
i->dft = dft; |
|
stt->create_work_queue = 1; |
|
stt->eh_strategy_handler = sas_scsi_recover_host; |
|
|
|
return stt; |
|
} |
|
EXPORT_SYMBOL_GPL(sas_domain_attach_transport); |
|
|
|
struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy, |
|
gfp_t gfp_flags) |
|
{ |
|
struct asd_sas_event *event; |
|
struct sas_ha_struct *sas_ha = phy->ha; |
|
struct sas_internal *i = |
|
to_sas_internal(sas_ha->core.shost->transportt); |
|
|
|
event = kmem_cache_zalloc(sas_event_cache, gfp_flags); |
|
if (!event) |
|
return NULL; |
|
|
|
atomic_inc(&phy->event_nr); |
|
|
|
if (atomic_read(&phy->event_nr) > phy->ha->event_thres) { |
|
if (i->dft->lldd_control_phy) { |
|
if (cmpxchg(&phy->in_shutdown, 0, 1) == 0) { |
|
pr_notice("The phy%d bursting events, shut it down.\n", |
|
phy->id); |
|
sas_notify_phy_event(phy, PHYE_SHUTDOWN, |
|
gfp_flags); |
|
} |
|
} else { |
|
/* Do not support PHY control, stop allocating events */ |
|
WARN_ONCE(1, "PHY control not supported.\n"); |
|
kmem_cache_free(sas_event_cache, event); |
|
atomic_dec(&phy->event_nr); |
|
event = NULL; |
|
} |
|
} |
|
|
|
return event; |
|
} |
|
|
|
void sas_free_event(struct asd_sas_event *event) |
|
{ |
|
struct asd_sas_phy *phy = event->phy; |
|
|
|
kmem_cache_free(sas_event_cache, event); |
|
atomic_dec(&phy->event_nr); |
|
} |
|
|
|
/* ---------- SAS Class register/unregister ---------- */ |
|
|
|
static int __init sas_class_init(void) |
|
{ |
|
sas_task_cache = KMEM_CACHE(sas_task, SLAB_HWCACHE_ALIGN); |
|
if (!sas_task_cache) |
|
goto out; |
|
|
|
sas_event_cache = KMEM_CACHE(asd_sas_event, SLAB_HWCACHE_ALIGN); |
|
if (!sas_event_cache) |
|
goto free_task_kmem; |
|
|
|
return 0; |
|
free_task_kmem: |
|
kmem_cache_destroy(sas_task_cache); |
|
out: |
|
return -ENOMEM; |
|
} |
|
|
|
static void __exit sas_class_exit(void) |
|
{ |
|
kmem_cache_destroy(sas_task_cache); |
|
kmem_cache_destroy(sas_event_cache); |
|
} |
|
|
|
MODULE_AUTHOR("Luben Tuikov <[email protected]>"); |
|
MODULE_DESCRIPTION("SAS Transport Layer"); |
|
MODULE_LICENSE("GPL v2"); |
|
|
|
module_init(sas_class_init); |
|
module_exit(sas_class_exit); |
|
|
|
EXPORT_SYMBOL_GPL(sas_register_ha); |
|
EXPORT_SYMBOL_GPL(sas_unregister_ha);
|
|
|