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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/scsi/libsas/sas_discover.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/scsi/libsas/sas_discover.c')
-rw-r--r-- | drivers/scsi/libsas/sas_discover.c | 607 |
1 files changed, 607 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c new file mode 100644 index 0000000000..ff7b63b10a --- /dev/null +++ b/drivers/scsi/libsas/sas_discover.c @@ -0,0 +1,607 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Serial Attached SCSI (SAS) Discover process + * + * Copyright (C) 2005 Adaptec, Inc. All rights reserved. + * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com> + */ + +#include <linux/scatterlist.h> +#include <linux/slab.h> +#include <scsi/scsi_host.h> +#include <scsi/scsi_eh.h> +#include "sas_internal.h" + +#include <scsi/scsi_transport.h> +#include <scsi/scsi_transport_sas.h> +#include <scsi/sas_ata.h> +#include "scsi_sas_internal.h" + +/* ---------- Basic task processing for discovery purposes ---------- */ + +void sas_init_dev(struct domain_device *dev) +{ + switch (dev->dev_type) { + case SAS_END_DEVICE: + INIT_LIST_HEAD(&dev->ssp_dev.eh_list_node); + break; + case SAS_EDGE_EXPANDER_DEVICE: + case SAS_FANOUT_EXPANDER_DEVICE: + INIT_LIST_HEAD(&dev->ex_dev.children); + mutex_init(&dev->ex_dev.cmd_mutex); + break; + default: + break; + } +} + +/* ---------- Domain device discovery ---------- */ + +/** + * sas_get_port_device - Discover devices which caused port creation + * @port: pointer to struct sas_port of interest + * + * Devices directly attached to a HA port, have no parent. This is + * how we know they are (domain) "root" devices. All other devices + * do, and should have their "parent" pointer set appropriately as + * soon as a child device is discovered. + */ +static int sas_get_port_device(struct asd_sas_port *port) +{ + struct asd_sas_phy *phy; + struct sas_rphy *rphy; + struct domain_device *dev; + int rc = -ENODEV; + + dev = sas_alloc_device(); + if (!dev) + return -ENOMEM; + + spin_lock_irq(&port->phy_list_lock); + if (list_empty(&port->phy_list)) { + spin_unlock_irq(&port->phy_list_lock); + sas_put_device(dev); + return -ENODEV; + } + phy = container_of(port->phy_list.next, struct asd_sas_phy, port_phy_el); + spin_lock(&phy->frame_rcvd_lock); + memcpy(dev->frame_rcvd, phy->frame_rcvd, min(sizeof(dev->frame_rcvd), + (size_t)phy->frame_rcvd_size)); + spin_unlock(&phy->frame_rcvd_lock); + spin_unlock_irq(&port->phy_list_lock); + + if (dev->frame_rcvd[0] == 0x34 && port->oob_mode == SATA_OOB_MODE) { + struct dev_to_host_fis *fis = + (struct dev_to_host_fis *) dev->frame_rcvd; + if (fis->interrupt_reason == 1 && fis->lbal == 1 && + fis->byte_count_low == 0x69 && fis->byte_count_high == 0x96 + && (fis->device & ~0x10) == 0) + dev->dev_type = SAS_SATA_PM; + else + dev->dev_type = SAS_SATA_DEV; + dev->tproto = SAS_PROTOCOL_SATA; + } else if (port->oob_mode == SAS_OOB_MODE) { + struct sas_identify_frame *id = + (struct sas_identify_frame *) dev->frame_rcvd; + dev->dev_type = id->dev_type; + dev->iproto = id->initiator_bits; + dev->tproto = id->target_bits; + } else { + /* If the oob mode is OOB_NOT_CONNECTED, the port is + * disconnected due to race with PHY down. We cannot + * continue to discover this port + */ + sas_put_device(dev); + pr_warn("Port %016llx is disconnected when discovering\n", + SAS_ADDR(port->attached_sas_addr)); + return -ENODEV; + } + + sas_init_dev(dev); + + dev->port = port; + switch (dev->dev_type) { + case SAS_SATA_DEV: + rc = sas_ata_init(dev); + if (rc) { + rphy = NULL; + break; + } + fallthrough; + case SAS_END_DEVICE: + rphy = sas_end_device_alloc(port->port); + break; + case SAS_EDGE_EXPANDER_DEVICE: + rphy = sas_expander_alloc(port->port, + SAS_EDGE_EXPANDER_DEVICE); + break; + case SAS_FANOUT_EXPANDER_DEVICE: + rphy = sas_expander_alloc(port->port, + SAS_FANOUT_EXPANDER_DEVICE); + break; + default: + pr_warn("ERROR: Unidentified device type %d\n", dev->dev_type); + rphy = NULL; + break; + } + + if (!rphy) { + sas_put_device(dev); + return rc; + } + + rphy->identify.phy_identifier = phy->phy->identify.phy_identifier; + memcpy(dev->sas_addr, port->attached_sas_addr, SAS_ADDR_SIZE); + sas_fill_in_rphy(dev, rphy); + sas_hash_addr(dev->hashed_sas_addr, dev->sas_addr); + port->port_dev = dev; + dev->linkrate = port->linkrate; + dev->min_linkrate = port->linkrate; + dev->max_linkrate = port->linkrate; + dev->pathways = port->num_phys; + memset(port->disc.fanout_sas_addr, 0, SAS_ADDR_SIZE); + memset(port->disc.eeds_a, 0, SAS_ADDR_SIZE); + memset(port->disc.eeds_b, 0, SAS_ADDR_SIZE); + port->disc.max_level = 0; + sas_device_set_phy(dev, port->port); + + dev->rphy = rphy; + get_device(&dev->rphy->dev); + + if (dev_is_sata(dev) || dev->dev_type == SAS_END_DEVICE) + list_add_tail(&dev->disco_list_node, &port->disco_list); + else { + spin_lock_irq(&port->dev_list_lock); + list_add_tail(&dev->dev_list_node, &port->dev_list); + spin_unlock_irq(&port->dev_list_lock); + } + + spin_lock_irq(&port->phy_list_lock); + list_for_each_entry(phy, &port->phy_list, port_phy_el) + sas_phy_set_target(phy, dev); + spin_unlock_irq(&port->phy_list_lock); + + return 0; +} + +/* ---------- Discover and Revalidate ---------- */ + +int sas_notify_lldd_dev_found(struct domain_device *dev) +{ + int res = 0; + struct sas_ha_struct *sas_ha = dev->port->ha; + struct Scsi_Host *shost = sas_ha->shost; + struct sas_internal *i = to_sas_internal(shost->transportt); + + if (!i->dft->lldd_dev_found) + return 0; + + res = i->dft->lldd_dev_found(dev); + if (res) { + pr_warn("driver on host %s cannot handle device %016llx, error:%d\n", + dev_name(sas_ha->dev), + SAS_ADDR(dev->sas_addr), res); + return res; + } + set_bit(SAS_DEV_FOUND, &dev->state); + kref_get(&dev->kref); + return 0; +} + + +void sas_notify_lldd_dev_gone(struct domain_device *dev) +{ + struct sas_ha_struct *sas_ha = dev->port->ha; + struct Scsi_Host *shost = sas_ha->shost; + struct sas_internal *i = to_sas_internal(shost->transportt); + + if (!i->dft->lldd_dev_gone) + return; + + if (test_and_clear_bit(SAS_DEV_FOUND, &dev->state)) { + i->dft->lldd_dev_gone(dev); + sas_put_device(dev); + } +} + +static void sas_probe_devices(struct asd_sas_port *port) +{ + struct domain_device *dev, *n; + + /* devices must be domain members before link recovery and probe */ + list_for_each_entry(dev, &port->disco_list, disco_list_node) { + spin_lock_irq(&port->dev_list_lock); + list_add_tail(&dev->dev_list_node, &port->dev_list); + spin_unlock_irq(&port->dev_list_lock); + } + + sas_probe_sata(port); + + list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) { + int err; + + err = sas_rphy_add(dev->rphy); + if (err) + sas_fail_probe(dev, __func__, err); + else + list_del_init(&dev->disco_list_node); + } +} + +static void sas_suspend_devices(struct work_struct *work) +{ + struct asd_sas_phy *phy; + struct domain_device *dev; + struct sas_discovery_event *ev = to_sas_discovery_event(work); + struct asd_sas_port *port = ev->port; + struct Scsi_Host *shost = port->ha->shost; + struct sas_internal *si = to_sas_internal(shost->transportt); + + clear_bit(DISCE_SUSPEND, &port->disc.pending); + + sas_suspend_sata(port); + + /* lldd is free to forget the domain_device across the + * suspension, we force the issue here to keep the reference + * counts aligned + */ + list_for_each_entry(dev, &port->dev_list, dev_list_node) + sas_notify_lldd_dev_gone(dev); + + /* we are suspending, so we know events are disabled and + * phy_list is not being mutated + */ + list_for_each_entry(phy, &port->phy_list, port_phy_el) { + if (si->dft->lldd_port_deformed) + si->dft->lldd_port_deformed(phy); + phy->suspended = 1; + port->suspended = 1; + } +} + +static void sas_resume_devices(struct work_struct *work) +{ + struct sas_discovery_event *ev = to_sas_discovery_event(work); + struct asd_sas_port *port = ev->port; + + clear_bit(DISCE_RESUME, &port->disc.pending); + + sas_resume_sata(port); +} + +/** + * sas_discover_end_dev - discover an end device (SSP, etc) + * @dev: pointer to domain device of interest + * + * See comment in sas_discover_sata(). + */ +int sas_discover_end_dev(struct domain_device *dev) +{ + return sas_notify_lldd_dev_found(dev); +} + +/* ---------- Device registration and unregistration ---------- */ + +void sas_free_device(struct kref *kref) +{ + struct domain_device *dev = container_of(kref, typeof(*dev), kref); + + put_device(&dev->rphy->dev); + dev->rphy = NULL; + + if (dev->parent) + sas_put_device(dev->parent); + + sas_port_put_phy(dev->phy); + dev->phy = NULL; + + /* remove the phys and ports, everything else should be gone */ + if (dev_is_expander(dev->dev_type)) + kfree(dev->ex_dev.ex_phy); + + if (dev_is_sata(dev) && dev->sata_dev.ap) { + ata_sas_tport_delete(dev->sata_dev.ap); + kfree(dev->sata_dev.ap); + ata_host_put(dev->sata_dev.ata_host); + dev->sata_dev.ata_host = NULL; + dev->sata_dev.ap = NULL; + } + + kfree(dev); +} + +static void sas_unregister_common_dev(struct asd_sas_port *port, struct domain_device *dev) +{ + struct sas_ha_struct *ha = port->ha; + + sas_notify_lldd_dev_gone(dev); + if (!dev->parent) + dev->port->port_dev = NULL; + else + list_del_init(&dev->siblings); + + spin_lock_irq(&port->dev_list_lock); + list_del_init(&dev->dev_list_node); + if (dev_is_sata(dev)) + sas_ata_end_eh(dev->sata_dev.ap); + spin_unlock_irq(&port->dev_list_lock); + + spin_lock_irq(&ha->lock); + if (dev->dev_type == SAS_END_DEVICE && + !list_empty(&dev->ssp_dev.eh_list_node)) { + list_del_init(&dev->ssp_dev.eh_list_node); + ha->eh_active--; + } + spin_unlock_irq(&ha->lock); + + sas_put_device(dev); +} + +void sas_destruct_devices(struct asd_sas_port *port) +{ + struct domain_device *dev, *n; + + list_for_each_entry_safe(dev, n, &port->destroy_list, disco_list_node) { + list_del_init(&dev->disco_list_node); + + sas_remove_children(&dev->rphy->dev); + sas_rphy_delete(dev->rphy); + sas_unregister_common_dev(port, dev); + } +} + +static void sas_destruct_ports(struct asd_sas_port *port) +{ + struct sas_port *sas_port, *p; + + list_for_each_entry_safe(sas_port, p, &port->sas_port_del_list, del_list) { + list_del_init(&sas_port->del_list); + sas_port_delete(sas_port); + } +} + +static bool sas_abort_cmd(struct request *req, void *data) +{ + struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); + struct domain_device *dev = data; + + if (dev == cmd_to_domain_dev(cmd)) + blk_abort_request(req); + return true; +} + +static void sas_abort_device_scsi_cmds(struct domain_device *dev) +{ + struct sas_ha_struct *sas_ha = dev->port->ha; + struct Scsi_Host *shost = sas_ha->shost; + + if (dev_is_expander(dev->dev_type)) + return; + + /* + * For removed device with active IOs, the user space applications have + * to spend very long time waiting for the timeout. This is not + * necessary because a removed device will not return the IOs. + * Abort the inflight IOs here so that EH can be quickly kicked in. + */ + blk_mq_tagset_busy_iter(&shost->tag_set, sas_abort_cmd, dev); +} + +void sas_unregister_dev(struct asd_sas_port *port, struct domain_device *dev) +{ + if (!test_bit(SAS_DEV_DESTROY, &dev->state) && + !list_empty(&dev->disco_list_node)) { + /* this rphy never saw sas_rphy_add */ + list_del_init(&dev->disco_list_node); + sas_rphy_free(dev->rphy); + sas_unregister_common_dev(port, dev); + return; + } + + if (!test_and_set_bit(SAS_DEV_DESTROY, &dev->state)) { + if (test_bit(SAS_DEV_GONE, &dev->state)) + sas_abort_device_scsi_cmds(dev); + sas_rphy_unlink(dev->rphy); + list_move_tail(&dev->disco_list_node, &port->destroy_list); + } +} + +void sas_unregister_domain_devices(struct asd_sas_port *port, int gone) +{ + struct domain_device *dev, *n; + + list_for_each_entry_safe_reverse(dev, n, &port->dev_list, dev_list_node) { + if (gone) + set_bit(SAS_DEV_GONE, &dev->state); + sas_unregister_dev(port, dev); + } + + list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) + sas_unregister_dev(port, dev); + + port->port->rphy = NULL; + +} + +void sas_device_set_phy(struct domain_device *dev, struct sas_port *port) +{ + struct sas_ha_struct *ha; + struct sas_phy *new_phy; + + if (!dev) + return; + + ha = dev->port->ha; + new_phy = sas_port_get_phy(port); + + /* pin and record last seen phy */ + spin_lock_irq(&ha->phy_port_lock); + if (new_phy) { + sas_port_put_phy(dev->phy); + dev->phy = new_phy; + } + spin_unlock_irq(&ha->phy_port_lock); +} + +/* ---------- Discovery and Revalidation ---------- */ + +/** + * sas_discover_domain - discover the domain + * @work: work structure embedded in port domain device. + * + * NOTE: this process _must_ quit (return) as soon as any connection + * errors are encountered. Connection recovery is done elsewhere. + * Discover process only interrogates devices in order to discover the + * domain. + */ +static void sas_discover_domain(struct work_struct *work) +{ + struct domain_device *dev; + int error = 0; + struct sas_discovery_event *ev = to_sas_discovery_event(work); + struct asd_sas_port *port = ev->port; + + clear_bit(DISCE_DISCOVER_DOMAIN, &port->disc.pending); + + if (port->port_dev) + return; + + error = sas_get_port_device(port); + if (error) + return; + dev = port->port_dev; + + pr_debug("DOING DISCOVERY on port %d, pid:%d\n", port->id, + task_pid_nr(current)); + + switch (dev->dev_type) { + case SAS_END_DEVICE: + error = sas_discover_end_dev(dev); + break; + case SAS_EDGE_EXPANDER_DEVICE: + case SAS_FANOUT_EXPANDER_DEVICE: + error = sas_discover_root_expander(dev); + break; + case SAS_SATA_DEV: + case SAS_SATA_PM: + error = sas_discover_sata(dev); + break; + default: + error = -ENXIO; + pr_err("unhandled device %d\n", dev->dev_type); + break; + } + + if (error) { + sas_rphy_free(dev->rphy); + list_del_init(&dev->disco_list_node); + spin_lock_irq(&port->dev_list_lock); + list_del_init(&dev->dev_list_node); + spin_unlock_irq(&port->dev_list_lock); + + sas_put_device(dev); + port->port_dev = NULL; + } + + sas_probe_devices(port); + + pr_debug("DONE DISCOVERY on port %d, pid:%d, result:%d\n", port->id, + task_pid_nr(current), error); +} + +static void sas_revalidate_domain(struct work_struct *work) +{ + int res = 0; + struct sas_discovery_event *ev = to_sas_discovery_event(work); + struct asd_sas_port *port = ev->port; + struct sas_ha_struct *ha = port->ha; + struct domain_device *ddev = port->port_dev; + + /* prevent revalidation from finding sata links in recovery */ + mutex_lock(&ha->disco_mutex); + if (test_bit(SAS_HA_ATA_EH_ACTIVE, &ha->state)) { + pr_debug("REVALIDATION DEFERRED on port %d, pid:%d\n", + port->id, task_pid_nr(current)); + goto out; + } + + clear_bit(DISCE_REVALIDATE_DOMAIN, &port->disc.pending); + + pr_debug("REVALIDATING DOMAIN on port %d, pid:%d\n", port->id, + task_pid_nr(current)); + + if (ddev && dev_is_expander(ddev->dev_type)) + res = sas_ex_revalidate_domain(ddev); + + pr_debug("done REVALIDATING DOMAIN on port %d, pid:%d, res 0x%x\n", + port->id, task_pid_nr(current), res); + out: + mutex_unlock(&ha->disco_mutex); + + sas_destruct_devices(port); + sas_destruct_ports(port); + sas_probe_devices(port); +} + +/* ---------- Events ---------- */ + +static void sas_chain_work(struct sas_ha_struct *ha, struct sas_work *sw) +{ + /* chained work is not subject to SA_HA_DRAINING or + * SAS_HA_REGISTERED, because it is either submitted in the + * workqueue, or known to be submitted from a context that is + * not racing against draining + */ + queue_work(ha->disco_q, &sw->work); +} + +static void sas_chain_event(int event, unsigned long *pending, + struct sas_work *sw, + struct sas_ha_struct *ha) +{ + if (!test_and_set_bit(event, pending)) { + unsigned long flags; + + spin_lock_irqsave(&ha->lock, flags); + sas_chain_work(ha, sw); + spin_unlock_irqrestore(&ha->lock, flags); + } +} + +void sas_discover_event(struct asd_sas_port *port, enum discover_event ev) +{ + struct sas_discovery *disc; + + if (!port) + return; + disc = &port->disc; + + BUG_ON(ev >= DISC_NUM_EVENTS); + + sas_chain_event(ev, &disc->pending, &disc->disc_work[ev].work, port->ha); +} + +/** + * sas_init_disc - initialize the discovery struct in the port + * @disc: port discovery structure + * @port: pointer to struct port + * + * Called when the ports are being initialized. + */ +void sas_init_disc(struct sas_discovery *disc, struct asd_sas_port *port) +{ + int i; + + static const work_func_t sas_event_fns[DISC_NUM_EVENTS] = { + [DISCE_DISCOVER_DOMAIN] = sas_discover_domain, + [DISCE_REVALIDATE_DOMAIN] = sas_revalidate_domain, + [DISCE_SUSPEND] = sas_suspend_devices, + [DISCE_RESUME] = sas_resume_devices, + }; + + disc->pending = 0; + for (i = 0; i < DISC_NUM_EVENTS; i++) { + INIT_SAS_WORK(&disc->disc_work[i].work, sas_event_fns[i]); + disc->disc_work[i].port = port; + } +} |