linux/drivers/scsi/smartpqi/smartpqi_sas_transport.c

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/*
* driver for Microsemi PQI-based storage controllers
* Copyright (c) 2016-2017 Microsemi Corporation
* Copyright (c) 2016 PMC-Sierra, Inc.
*
* 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; version 2 of the License.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more details.
*
* Questions/Comments/Bugfixes to esc.storagedev@microsemi.com
*
*/
#include <linux/kernel.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_transport_sas.h>
#include "smartpqi.h"
static struct pqi_sas_phy *pqi_alloc_sas_phy(struct pqi_sas_port *pqi_sas_port)
{
struct pqi_sas_phy *pqi_sas_phy;
struct sas_phy *phy;
pqi_sas_phy = kzalloc(sizeof(*pqi_sas_phy), GFP_KERNEL);
if (!pqi_sas_phy)
return NULL;
phy = sas_phy_alloc(pqi_sas_port->parent_node->parent_dev,
pqi_sas_port->next_phy_index);
if (!phy) {
kfree(pqi_sas_phy);
return NULL;
}
pqi_sas_port->next_phy_index++;
pqi_sas_phy->phy = phy;
pqi_sas_phy->parent_port = pqi_sas_port;
return pqi_sas_phy;
}
static void pqi_free_sas_phy(struct pqi_sas_phy *pqi_sas_phy)
{
struct sas_phy *phy = pqi_sas_phy->phy;
sas_port_delete_phy(pqi_sas_phy->parent_port->port, phy);
sas_phy_free(phy);
if (pqi_sas_phy->added_to_port)
list_del(&pqi_sas_phy->phy_list_entry);
kfree(pqi_sas_phy);
}
static int pqi_sas_port_add_phy(struct pqi_sas_phy *pqi_sas_phy)
{
int rc;
struct pqi_sas_port *pqi_sas_port;
struct sas_phy *phy;
struct sas_identify *identify;
pqi_sas_port = pqi_sas_phy->parent_port;
phy = pqi_sas_phy->phy;
identify = &phy->identify;
memset(identify, 0, sizeof(*identify));
identify->sas_address = pqi_sas_port->sas_address;
identify->device_type = SAS_END_DEVICE;
identify->initiator_port_protocols = SAS_PROTOCOL_STP;
identify->target_port_protocols = SAS_PROTOCOL_STP;
phy->minimum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
phy->maximum_linkrate_hw = SAS_LINK_RATE_UNKNOWN;
phy->minimum_linkrate = SAS_LINK_RATE_UNKNOWN;
phy->maximum_linkrate = SAS_LINK_RATE_UNKNOWN;
phy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN;
rc = sas_phy_add(pqi_sas_phy->phy);
if (rc)
return rc;
sas_port_add_phy(pqi_sas_port->port, pqi_sas_phy->phy);
list_add_tail(&pqi_sas_phy->phy_list_entry,
&pqi_sas_port->phy_list_head);
pqi_sas_phy->added_to_port = true;
return 0;
}
static int pqi_sas_port_add_rphy(struct pqi_sas_port *pqi_sas_port,
struct sas_rphy *rphy)
{
struct sas_identify *identify;
identify = &rphy->identify;
identify->sas_address = pqi_sas_port->sas_address;
identify->initiator_port_protocols = SAS_PROTOCOL_STP;
identify->target_port_protocols = SAS_PROTOCOL_STP;
return sas_rphy_add(rphy);
}
static struct pqi_sas_port *pqi_alloc_sas_port(
struct pqi_sas_node *pqi_sas_node, u64 sas_address)
{
int rc;
struct pqi_sas_port *pqi_sas_port;
struct sas_port *port;
pqi_sas_port = kzalloc(sizeof(*pqi_sas_port), GFP_KERNEL);
if (!pqi_sas_port)
return NULL;
INIT_LIST_HEAD(&pqi_sas_port->phy_list_head);
pqi_sas_port->parent_node = pqi_sas_node;
port = sas_port_alloc_num(pqi_sas_node->parent_dev);
if (!port)
goto free_pqi_port;
rc = sas_port_add(port);
if (rc)
goto free_sas_port;
pqi_sas_port->port = port;
pqi_sas_port->sas_address = sas_address;
list_add_tail(&pqi_sas_port->port_list_entry,
&pqi_sas_node->port_list_head);
return pqi_sas_port;
free_sas_port:
sas_port_free(port);
free_pqi_port:
kfree(pqi_sas_port);
return NULL;
}
static void pqi_free_sas_port(struct pqi_sas_port *pqi_sas_port)
{
struct pqi_sas_phy *pqi_sas_phy;
struct pqi_sas_phy *next;
list_for_each_entry_safe(pqi_sas_phy, next,
&pqi_sas_port->phy_list_head, phy_list_entry)
pqi_free_sas_phy(pqi_sas_phy);
sas_port_delete(pqi_sas_port->port);
list_del(&pqi_sas_port->port_list_entry);
kfree(pqi_sas_port);
}
static struct pqi_sas_node *pqi_alloc_sas_node(struct device *parent_dev)
{
struct pqi_sas_node *pqi_sas_node;
pqi_sas_node = kzalloc(sizeof(*pqi_sas_node), GFP_KERNEL);
if (pqi_sas_node) {
pqi_sas_node->parent_dev = parent_dev;
INIT_LIST_HEAD(&pqi_sas_node->port_list_head);
}
return pqi_sas_node;
}
static void pqi_free_sas_node(struct pqi_sas_node *pqi_sas_node)
{
struct pqi_sas_port *pqi_sas_port;
struct pqi_sas_port *next;
if (!pqi_sas_node)
return;
list_for_each_entry_safe(pqi_sas_port, next,
&pqi_sas_node->port_list_head, port_list_entry)
pqi_free_sas_port(pqi_sas_port);
kfree(pqi_sas_node);
}
struct pqi_scsi_dev *pqi_find_device_by_sas_rphy(
struct pqi_ctrl_info *ctrl_info, struct sas_rphy *rphy)
{
struct pqi_scsi_dev *device;
list_for_each_entry(device, &ctrl_info->scsi_device_list,
scsi_device_list_entry) {
if (!device->sas_port)
continue;
if (device->sas_port->rphy == rphy)
return device;
}
return NULL;
}
int pqi_add_sas_host(struct Scsi_Host *shost, struct pqi_ctrl_info *ctrl_info)
{
int rc;
struct device *parent_dev;
struct pqi_sas_node *pqi_sas_node;
struct pqi_sas_port *pqi_sas_port;
struct pqi_sas_phy *pqi_sas_phy;
parent_dev = &shost->shost_gendev;
pqi_sas_node = pqi_alloc_sas_node(parent_dev);
if (!pqi_sas_node)
return -ENOMEM;
pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node, ctrl_info->sas_address);
if (!pqi_sas_port) {
rc = -ENODEV;
goto free_sas_node;
}
pqi_sas_phy = pqi_alloc_sas_phy(pqi_sas_port);
if (!pqi_sas_phy) {
rc = -ENODEV;
goto free_sas_port;
}
rc = pqi_sas_port_add_phy(pqi_sas_phy);
if (rc)
goto free_sas_phy;
ctrl_info->sas_host = pqi_sas_node;
return 0;
free_sas_phy:
pqi_free_sas_phy(pqi_sas_phy);
free_sas_port:
pqi_free_sas_port(pqi_sas_port);
free_sas_node:
pqi_free_sas_node(pqi_sas_node);
return rc;
}
void pqi_delete_sas_host(struct pqi_ctrl_info *ctrl_info)
{
pqi_free_sas_node(ctrl_info->sas_host);
}
int pqi_add_sas_device(struct pqi_sas_node *pqi_sas_node,
struct pqi_scsi_dev *device)
{
int rc;
struct pqi_sas_port *pqi_sas_port;
struct sas_rphy *rphy;
pqi_sas_port = pqi_alloc_sas_port(pqi_sas_node, device->sas_address);
if (!pqi_sas_port)
return -ENOMEM;
rphy = sas_end_device_alloc(pqi_sas_port->port);
if (!rphy) {
rc = -ENODEV;
goto free_sas_port;
}
pqi_sas_port->rphy = rphy;
device->sas_port = pqi_sas_port;
rc = pqi_sas_port_add_rphy(pqi_sas_port, rphy);
if (rc)
goto free_sas_port;
return 0;
free_sas_port:
pqi_free_sas_port(pqi_sas_port);
device->sas_port = NULL;
return rc;
}
void pqi_remove_sas_device(struct pqi_scsi_dev *device)
{
if (device->sas_port) {
pqi_free_sas_port(device->sas_port);
device->sas_port = NULL;
}
}
static int pqi_sas_get_linkerrors(struct sas_phy *phy)
{
return 0;
}
static int pqi_sas_get_enclosure_identifier(struct sas_rphy *rphy,
u64 *identifier)
{
return 0;
}
static int pqi_sas_get_bay_identifier(struct sas_rphy *rphy)
{
return -ENXIO;
}
static int pqi_sas_phy_reset(struct sas_phy *phy, int hard_reset)
{
return 0;
}
static int pqi_sas_phy_enable(struct sas_phy *phy, int enable)
{
return 0;
}
static int pqi_sas_phy_setup(struct sas_phy *phy)
{
return 0;
}
static void pqi_sas_phy_release(struct sas_phy *phy)
{
}
static int pqi_sas_phy_speed(struct sas_phy *phy,
struct sas_phy_linkrates *rates)
{
return -EINVAL;
}
struct sas_function_template pqi_sas_transport_functions = {
.get_linkerrors = pqi_sas_get_linkerrors,
.get_enclosure_identifier = pqi_sas_get_enclosure_identifier,
.get_bay_identifier = pqi_sas_get_bay_identifier,
.phy_reset = pqi_sas_phy_reset,
.phy_enable = pqi_sas_phy_enable,
.phy_setup = pqi_sas_phy_setup,
.phy_release = pqi_sas_phy_release,
.set_phy_speed = pqi_sas_phy_speed,
};