From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/scsi/libsas/sas_port.c | 361 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 361 insertions(+) create mode 100644 drivers/scsi/libsas/sas_port.c (limited to 'drivers/scsi/libsas/sas_port.c') diff --git a/drivers/scsi/libsas/sas_port.c b/drivers/scsi/libsas/sas_port.c new file mode 100644 index 000000000..1a0b2ce39 --- /dev/null +++ b/drivers/scsi/libsas/sas_port.c @@ -0,0 +1,361 @@ +/* + * Serial Attached SCSI (SAS) Port class + * + * Copyright (C) 2005 Adaptec, Inc. All rights reserved. + * Copyright (C) 2005 Luben Tuikov + * + * This file is licensed under GPLv2. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include "sas_internal.h" + +#include +#include +#include "../scsi_sas_internal.h" + +static bool phy_is_wideport_member(struct asd_sas_port *port, struct asd_sas_phy *phy) +{ + struct sas_ha_struct *sas_ha = phy->ha; + + if (memcmp(port->attached_sas_addr, phy->attached_sas_addr, + SAS_ADDR_SIZE) != 0 || (sas_ha->strict_wide_ports && + memcmp(port->sas_addr, phy->sas_addr, SAS_ADDR_SIZE) != 0)) + return false; + return true; +} + +static void sas_resume_port(struct asd_sas_phy *phy) +{ + struct domain_device *dev, *n; + struct asd_sas_port *port = phy->port; + struct sas_ha_struct *sas_ha = phy->ha; + struct sas_internal *si = to_sas_internal(sas_ha->core.shost->transportt); + + if (si->dft->lldd_port_formed) + si->dft->lldd_port_formed(phy); + + if (port->suspended) + port->suspended = 0; + else { + /* we only need to handle "link returned" actions once */ + return; + } + + /* if the port came back: + * 1/ presume every device came back + * 2/ force the next revalidation to check all expander phys + */ + list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) { + int i, rc; + + rc = sas_notify_lldd_dev_found(dev); + if (rc) { + sas_unregister_dev(port, dev); + sas_destruct_devices(port); + continue; + } + + if (dev->dev_type == SAS_EDGE_EXPANDER_DEVICE || dev->dev_type == SAS_FANOUT_EXPANDER_DEVICE) { + dev->ex_dev.ex_change_count = -1; + for (i = 0; i < dev->ex_dev.num_phys; i++) { + struct ex_phy *phy = &dev->ex_dev.ex_phy[i]; + + phy->phy_change_count = -1; + } + } + } + + sas_discover_event(port, DISCE_RESUME); +} + +/** + * sas_form_port - add this phy to a port + * @phy: the phy of interest + * + * This function adds this phy to an existing port, thus creating a wide + * port, or it creates a port and adds the phy to the port. + */ +static void sas_form_port(struct asd_sas_phy *phy) +{ + int i; + struct sas_ha_struct *sas_ha = phy->ha; + struct asd_sas_port *port = phy->port; + struct sas_internal *si = + to_sas_internal(sas_ha->core.shost->transportt); + unsigned long flags; + + if (port) { + if (!phy_is_wideport_member(port, phy)) + sas_deform_port(phy, 0); + else if (phy->suspended) { + phy->suspended = 0; + sas_resume_port(phy); + + /* phy came back, try to cancel the timeout */ + wake_up(&sas_ha->eh_wait_q); + return; + } else { + SAS_DPRINTK("%s: phy%d belongs to port%d already(%d)!\n", + __func__, phy->id, phy->port->id, + phy->port->num_phys); + return; + } + } + + /* see if the phy should be part of a wide port */ + spin_lock_irqsave(&sas_ha->phy_port_lock, flags); + for (i = 0; i < sas_ha->num_phys; i++) { + port = sas_ha->sas_port[i]; + spin_lock(&port->phy_list_lock); + if (*(u64 *) port->sas_addr && + phy_is_wideport_member(port, phy) && port->num_phys > 0) { + /* wide port */ + SAS_DPRINTK("phy%d matched wide port%d\n", phy->id, + port->id); + break; + } + spin_unlock(&port->phy_list_lock); + } + /* The phy does not match any existing port, create a new one */ + if (i == sas_ha->num_phys) { + for (i = 0; i < sas_ha->num_phys; i++) { + port = sas_ha->sas_port[i]; + spin_lock(&port->phy_list_lock); + if (*(u64 *)port->sas_addr == 0 + && port->num_phys == 0) { + memcpy(port->sas_addr, phy->sas_addr, + SAS_ADDR_SIZE); + break; + } + spin_unlock(&port->phy_list_lock); + } + } + + if (i >= sas_ha->num_phys) { + printk(KERN_NOTICE "%s: couldn't find a free port, bug?\n", + __func__); + spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); + return; + } + + /* add the phy to the port */ + list_add_tail(&phy->port_phy_el, &port->phy_list); + sas_phy_set_target(phy, port->port_dev); + phy->port = port; + port->num_phys++; + port->phy_mask |= (1U << phy->id); + + if (*(u64 *)port->attached_sas_addr == 0) { + port->class = phy->class; + memcpy(port->attached_sas_addr, phy->attached_sas_addr, + SAS_ADDR_SIZE); + port->iproto = phy->iproto; + port->tproto = phy->tproto; + port->oob_mode = phy->oob_mode; + port->linkrate = phy->linkrate; + } else + port->linkrate = max(port->linkrate, phy->linkrate); + spin_unlock(&port->phy_list_lock); + spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); + + if (!port->port) { + port->port = sas_port_alloc(phy->phy->dev.parent, port->id); + BUG_ON(!port->port); + sas_port_add(port->port); + } + sas_port_add_phy(port->port, phy->phy); + + SAS_DPRINTK("%s added to %s, phy_mask:0x%x (%16llx)\n", + dev_name(&phy->phy->dev), dev_name(&port->port->dev), + port->phy_mask, + SAS_ADDR(port->attached_sas_addr)); + + if (port->port_dev) + port->port_dev->pathways = port->num_phys; + + /* Tell the LLDD about this port formation. */ + if (si->dft->lldd_port_formed) + si->dft->lldd_port_formed(phy); + + sas_discover_event(phy->port, DISCE_DISCOVER_DOMAIN); + flush_workqueue(sas_ha->disco_q); +} + +/** + * sas_deform_port - remove this phy from the port it belongs to + * @phy: the phy of interest + * @gone: whether or not the PHY is gone + * + * This is called when the physical link to the other phy has been + * lost (on this phy), in Event thread context. We cannot delay here. + */ +void sas_deform_port(struct asd_sas_phy *phy, int gone) +{ + struct sas_ha_struct *sas_ha = phy->ha; + struct asd_sas_port *port = phy->port; + struct sas_internal *si = + to_sas_internal(sas_ha->core.shost->transportt); + struct domain_device *dev; + unsigned long flags; + + if (!port) + return; /* done by a phy event */ + + dev = port->port_dev; + if (dev) + dev->pathways--; + + if (port->num_phys == 1) { + sas_unregister_domain_devices(port, gone); + sas_destruct_devices(port); + sas_port_delete(port->port); + port->port = NULL; + } else { + sas_port_delete_phy(port->port, phy->phy); + sas_device_set_phy(dev, port->port); + } + + if (si->dft->lldd_port_deformed) + si->dft->lldd_port_deformed(phy); + + spin_lock_irqsave(&sas_ha->phy_port_lock, flags); + spin_lock(&port->phy_list_lock); + + list_del_init(&phy->port_phy_el); + sas_phy_set_target(phy, NULL); + phy->port = NULL; + port->num_phys--; + port->phy_mask &= ~(1U << phy->id); + + if (port->num_phys == 0) { + INIT_LIST_HEAD(&port->phy_list); + memset(port->sas_addr, 0, SAS_ADDR_SIZE); + memset(port->attached_sas_addr, 0, SAS_ADDR_SIZE); + port->class = 0; + port->iproto = 0; + port->tproto = 0; + port->oob_mode = 0; + port->phy_mask = 0; + } + spin_unlock(&port->phy_list_lock); + spin_unlock_irqrestore(&sas_ha->phy_port_lock, flags); + + return; +} + +/* ---------- SAS port events ---------- */ + +void sas_porte_bytes_dmaed(struct work_struct *work) +{ + struct asd_sas_event *ev = to_asd_sas_event(work); + struct asd_sas_phy *phy = ev->phy; + + sas_form_port(phy); +} + +void sas_porte_broadcast_rcvd(struct work_struct *work) +{ + struct asd_sas_event *ev = to_asd_sas_event(work); + struct asd_sas_phy *phy = ev->phy; + unsigned long flags; + u32 prim; + + spin_lock_irqsave(&phy->sas_prim_lock, flags); + prim = phy->sas_prim; + spin_unlock_irqrestore(&phy->sas_prim_lock, flags); + + SAS_DPRINTK("broadcast received: %d\n", prim); + sas_discover_event(phy->port, DISCE_REVALIDATE_DOMAIN); + + if (phy->port) + flush_workqueue(phy->port->ha->disco_q); +} + +void sas_porte_link_reset_err(struct work_struct *work) +{ + struct asd_sas_event *ev = to_asd_sas_event(work); + struct asd_sas_phy *phy = ev->phy; + + sas_deform_port(phy, 1); +} + +void sas_porte_timer_event(struct work_struct *work) +{ + struct asd_sas_event *ev = to_asd_sas_event(work); + struct asd_sas_phy *phy = ev->phy; + + sas_deform_port(phy, 1); +} + +void sas_porte_hard_reset(struct work_struct *work) +{ + struct asd_sas_event *ev = to_asd_sas_event(work); + struct asd_sas_phy *phy = ev->phy; + + sas_deform_port(phy, 1); +} + +/* ---------- SAS port registration ---------- */ + +static void sas_init_port(struct asd_sas_port *port, + struct sas_ha_struct *sas_ha, int i) +{ + memset(port, 0, sizeof(*port)); + port->id = i; + INIT_LIST_HEAD(&port->dev_list); + INIT_LIST_HEAD(&port->disco_list); + INIT_LIST_HEAD(&port->destroy_list); + INIT_LIST_HEAD(&port->sas_port_del_list); + spin_lock_init(&port->phy_list_lock); + INIT_LIST_HEAD(&port->phy_list); + port->ha = sas_ha; + + spin_lock_init(&port->dev_list_lock); +} + +int sas_register_ports(struct sas_ha_struct *sas_ha) +{ + int i; + + /* initialize the ports and discovery */ + for (i = 0; i < sas_ha->num_phys; i++) { + struct asd_sas_port *port = sas_ha->sas_port[i]; + + sas_init_port(port, sas_ha, i); + sas_init_disc(&port->disc, port); + } + return 0; +} + +void sas_unregister_ports(struct sas_ha_struct *sas_ha) +{ + int i; + + for (i = 0; i < sas_ha->num_phys; i++) + if (sas_ha->sas_phy[i]->port) + sas_deform_port(sas_ha->sas_phy[i], 0); + +} + +const work_func_t sas_port_event_fns[PORT_NUM_EVENTS] = { + [PORTE_BYTES_DMAED] = sas_porte_bytes_dmaed, + [PORTE_BROADCAST_RCVD] = sas_porte_broadcast_rcvd, + [PORTE_LINK_RESET_ERR] = sas_porte_link_reset_err, + [PORTE_TIMER_EVENT] = sas_porte_timer_event, + [PORTE_HARD_RESET] = sas_porte_hard_reset, +}; -- cgit v1.2.3