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linux/drivers/scsi/isci/init.c
Bartosz Barcinski 6cb4d6b382 isci: audit usage of BUG_ON macro in isci driver 
Removes unnecessary usage of BUG_ON macro, excluding core directory.
In some cases macro is unnecesary, check is done in caller function.
In other cases macro is replaced by if construction with
appropriate warning.

Signed-off-by: Maciej Patelczyk <maciej.patelczyk@intel.com>
[changed some survivable bug conditions to WARN_ONCE]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:00:37 -07:00

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/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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.
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* BSD LICENSE
*
* Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/efi.h>
#include <asm/string.h>
#include "isci.h"
#include "task.h"
#include "sci_controller_constants.h"
#include "scic_remote_device.h"
#include "sci_environment.h"
#include "probe_roms.h"
static struct scsi_transport_template *isci_transport_template;
static DEFINE_PCI_DEVICE_TABLE(isci_id_table) = {
{ PCI_VDEVICE(INTEL, 0x1D61),},
{ PCI_VDEVICE(INTEL, 0x1D63),},
{ PCI_VDEVICE(INTEL, 0x1D65),},
{ PCI_VDEVICE(INTEL, 0x1D67),},
{ PCI_VDEVICE(INTEL, 0x1D69),},
{ PCI_VDEVICE(INTEL, 0x1D6B),},
{ PCI_VDEVICE(INTEL, 0x1D60),},
{ PCI_VDEVICE(INTEL, 0x1D62),},
{ PCI_VDEVICE(INTEL, 0x1D64),},
{ PCI_VDEVICE(INTEL, 0x1D66),},
{ PCI_VDEVICE(INTEL, 0x1D68),},
{ PCI_VDEVICE(INTEL, 0x1D6A),},
{}
};
MODULE_DEVICE_TABLE(pci, isci_id_table);
/* linux isci specific settings */
#if defined(CONFIG_PBG_HBA_A0)
int isci_si_rev = ISCI_SI_REVA0;
#elif defined(CONFIG_PBG_HBA_A2)
int isci_si_rev = ISCI_SI_REVA2;
#else
int isci_si_rev = ISCI_SI_REVB0;
#endif
module_param(isci_si_rev, int, 0);
MODULE_PARM_DESC(isci_si_rev, "override default si rev (0: A0 1: A2 2: B0)");
unsigned char no_outbound_task_to = 20;
module_param(no_outbound_task_to, byte, 0);
MODULE_PARM_DESC(no_outbound_task_to, "No Outbound Task Timeout (1us incr)");
u16 ssp_max_occ_to = 20;
module_param(ssp_max_occ_to, ushort, 0);
MODULE_PARM_DESC(ssp_max_occ_to, "SSP Max occupancy timeout (100us incr)");
u16 stp_max_occ_to = 5;
module_param(stp_max_occ_to, ushort, 0);
MODULE_PARM_DESC(stp_max_occ_to, "STP Max occupancy timeout (100us incr)");
u16 ssp_inactive_to = 5;
module_param(ssp_inactive_to, ushort, 0);
MODULE_PARM_DESC(ssp_inactive_to, "SSP inactivity timeout (100us incr)");
u16 stp_inactive_to = 5;
module_param(stp_inactive_to, ushort, 0);
MODULE_PARM_DESC(stp_inactive_to, "STP inactivity timeout (100us incr)");
unsigned char phy_gen = 3;
module_param(phy_gen, byte, 0);
MODULE_PARM_DESC(phy_gen, "PHY generation (1: 1.5Gbps 2: 3.0Gbps 3: 6.0Gbps)");
unsigned char max_concurr_spinup = 1;
module_param(max_concurr_spinup, byte, 0);
MODULE_PARM_DESC(max_concurr_spinup, "Max concurrent device spinup");
static struct scsi_host_template isci_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.proc_name = DRV_NAME,
.queuecommand = sas_queuecommand,
.target_alloc = sas_target_alloc,
.slave_configure = sas_slave_configure,
.slave_destroy = sas_slave_destroy,
.scan_finished = isci_host_scan_finished,
.scan_start = isci_host_scan_start,
.change_queue_depth = sas_change_queue_depth,
.change_queue_type = sas_change_queue_type,
.bios_param = sas_bios_param,
.can_queue = ISCI_CAN_QUEUE_VAL,
.cmd_per_lun = 1,
.this_id = -1,
.sg_tablesize = SG_ALL,
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_bus_reset_handler = isci_bus_reset_handler,
.slave_alloc = sas_slave_alloc,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
};
static struct sas_domain_function_template isci_transport_ops = {
/* The class calls these to notify the LLDD of an event. */
.lldd_port_formed = isci_port_formed,
.lldd_port_deformed = isci_port_deformed,
/* The class calls these when a device is found or gone. */
.lldd_dev_found = isci_remote_device_found,
.lldd_dev_gone = isci_remote_device_gone,
.lldd_execute_task = isci_task_execute_task,
/* Task Management Functions. Must be called from process context. */
.lldd_abort_task = isci_task_abort_task,
.lldd_abort_task_set = isci_task_abort_task_set,
.lldd_clear_aca = isci_task_clear_aca,
.lldd_clear_task_set = isci_task_clear_task_set,
.lldd_I_T_nexus_reset = isci_task_I_T_nexus_reset,
.lldd_lu_reset = isci_task_lu_reset,
.lldd_query_task = isci_task_query_task,
/* Port and Adapter management */
.lldd_clear_nexus_port = isci_task_clear_nexus_port,
.lldd_clear_nexus_ha = isci_task_clear_nexus_ha,
/* Phy management */
.lldd_control_phy = isci_phy_control,
};
/******************************************************************************
* P R O T E C T E D M E T H O D S
******************************************************************************/
/**
* isci_register_sas_ha() - This method initializes various lldd
* specific members of the sas_ha struct and calls the libsas
* sas_register_ha() function.
* @isci_host: This parameter specifies the lldd specific wrapper for the
* libsas sas_ha struct.
*
* This method returns an error code indicating sucess or failure. The user
* should check for possible memory allocation error return otherwise, a zero
* indicates success.
*/
static int isci_register_sas_ha(struct isci_host *isci_host)
{
int i;
struct sas_ha_struct *sas_ha = &(isci_host->sas_ha);
struct asd_sas_phy **sas_phys;
struct asd_sas_port **sas_ports;
sas_phys = devm_kzalloc(&isci_host->pdev->dev,
SCI_MAX_PHYS * sizeof(void *),
GFP_KERNEL);
if (!sas_phys)
return -ENOMEM;
sas_ports = devm_kzalloc(&isci_host->pdev->dev,
SCI_MAX_PORTS * sizeof(void *),
GFP_KERNEL);
if (!sas_ports)
return -ENOMEM;
/*----------------- Libsas Initialization Stuff----------------------
* Set various fields in the sas_ha struct:
*/
sas_ha->sas_ha_name = DRV_NAME;
sas_ha->lldd_module = THIS_MODULE;
sas_ha->sas_addr = &isci_host->phys[0].sas_addr[0];
/* set the array of phy and port structs. */
for (i = 0; i < SCI_MAX_PHYS; i++) {
sas_phys[i] = &(isci_host->phys[i].sas_phy);
sas_ports[i] = &(isci_host->sas_ports[i]);
}
sas_ha->sas_phy = sas_phys;
sas_ha->sas_port = sas_ports;
sas_ha->num_phys = SCI_MAX_PHYS;
sas_ha->lldd_queue_size = ISCI_CAN_QUEUE_VAL;
sas_ha->lldd_max_execute_num = 1;
sas_ha->strict_wide_ports = 1;
sas_register_ha(sas_ha);
return 0;
}
static ssize_t isci_show_id(struct device *dev, struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = container_of(dev, typeof(*shost), shost_dev);
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
struct isci_host *ihost = container_of(sas_ha, typeof(*ihost), sas_ha);
return snprintf(buf, PAGE_SIZE, "%d\n", ihost->id);
}
static DEVICE_ATTR(isci_id, S_IRUGO, isci_show_id, NULL);
static void isci_unregister(struct isci_host *isci_host)
{
struct Scsi_Host *shost;
if (!isci_host)
return;
shost = isci_host->shost;
device_remove_file(&shost->shost_dev, &dev_attr_isci_id);
sas_unregister_ha(&isci_host->sas_ha);
sas_remove_host(isci_host->shost);
scsi_remove_host(isci_host->shost);
scsi_host_put(isci_host->shost);
}
static int __devinit isci_pci_init(struct pci_dev *pdev)
{
int err, bar_num, bar_mask;
void __iomem * const *iomap;
err = pcim_enable_device(pdev);
if (err) {
dev_err(&pdev->dev,
"failed enable PCI device %s!\n",
pci_name(pdev));
return err;
}
for (bar_num = 0; bar_num < SCI_PCI_BAR_COUNT; bar_num++)
bar_mask |= 1 << (bar_num * 2);
err = pcim_iomap_regions(pdev, bar_mask, DRV_NAME);
if (err)
return err;
iomap = pcim_iomap_table(pdev);
if (!iomap)
return -ENOMEM;
pci_set_master(pdev);
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
if (err) {
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (err)
return err;
}
err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
if (err) {
err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
if (err)
return err;
}
return 0;
}
static int num_controllers(struct pci_dev *pdev)
{
/* bar size alone can tell us if we are running with a dual controller
* part, no need to trust revision ids that might be under broken firmware
* control
*/
resource_size_t scu_bar_size = pci_resource_len(pdev, SCI_SCU_BAR*2);
resource_size_t smu_bar_size = pci_resource_len(pdev, SCI_SMU_BAR*2);
if (scu_bar_size >= SCI_SCU_BAR_SIZE*SCI_MAX_CONTROLLERS &&
smu_bar_size >= SCI_SMU_BAR_SIZE*SCI_MAX_CONTROLLERS)
return SCI_MAX_CONTROLLERS;
else
return 1;
}
static int isci_setup_interrupts(struct pci_dev *pdev)
{
int err, i, num_msix;
struct isci_pci_info *pci_info = to_pci_info(pdev);
/*
* Determine the number of vectors associated with this
* PCI function.
*/
num_msix = num_controllers(pdev) * SCI_NUM_MSI_X_INT;
for (i = 0; i < num_msix; i++)
pci_info->msix_entries[i].entry = i;
err = pci_enable_msix(pdev, pci_info->msix_entries, num_msix);
if (err)
goto intx;
for (i = 0; i < num_msix; i++) {
int id = i / SCI_NUM_MSI_X_INT;
struct msix_entry *msix = &pci_info->msix_entries[i];
struct isci_host *isci_host = pci_info->hosts[id];
irq_handler_t isr;
/* odd numbered vectors are error interrupts */
if (i & 1)
isr = isci_error_isr;
else
isr = isci_msix_isr;
err = devm_request_irq(&pdev->dev, msix->vector, isr, 0,
DRV_NAME"-msix", isci_host);
if (!err)
continue;
dev_info(&pdev->dev, "msix setup failed falling back to intx\n");
while (i--) {
id = i / SCI_NUM_MSI_X_INT;
isci_host = pci_info->hosts[id];
msix = &pci_info->msix_entries[i];
devm_free_irq(&pdev->dev, msix->vector, isci_host);
}
pci_disable_msix(pdev);
goto intx;
}
return 0;
intx:
err = devm_request_irq(&pdev->dev, pdev->irq, isci_intx_isr,
IRQF_SHARED, DRV_NAME"-intx", pdev);
return err;
}
static struct isci_host *isci_host_alloc(struct pci_dev *pdev, int id)
{
struct isci_host *isci_host;
struct Scsi_Host *shost;
int err;
isci_host = devm_kzalloc(&pdev->dev, sizeof(*isci_host) +
SCI_MAX_REMOTE_DEVICES *
(sizeof(struct isci_remote_device) +
scic_remote_device_get_object_size()), GFP_KERNEL);
if (!isci_host)
return NULL;
isci_host->pdev = pdev;
isci_host->id = id;
shost = scsi_host_alloc(&isci_sht, sizeof(void *));
if (!shost)
return NULL;
isci_host->shost = shost;
err = isci_host_init(isci_host);
if (err)
goto err_shost;
SHOST_TO_SAS_HA(shost) = &isci_host->sas_ha;
isci_host->sas_ha.core.shost = shost;
shost->transportt = isci_transport_template;
shost->max_id = ~0;
shost->max_lun = ~0;
shost->max_cmd_len = MAX_COMMAND_SIZE;
err = scsi_add_host(shost, &pdev->dev);
if (err)
goto err_shost;
err = isci_register_sas_ha(isci_host);
if (err)
goto err_shost_remove;
err = device_create_file(&shost->shost_dev, &dev_attr_isci_id);
if (err)
goto err_unregister_ha;
return isci_host;
err_unregister_ha:
sas_unregister_ha(&(isci_host->sas_ha));
err_shost_remove:
scsi_remove_host(shost);
err_shost:
scsi_host_put(shost);
return NULL;
}
static void check_si_rev(struct pci_dev *pdev)
{
if (num_controllers(pdev) > 1)
isci_si_rev = ISCI_SI_REVB0;
else {
switch (pdev->revision) {
case 0:
case 1:
/* if the id is ambiguous don't update isci_si_rev */
break;
case 3:
isci_si_rev = ISCI_SI_REVA2;
break;
default:
case 4:
isci_si_rev = ISCI_SI_REVB0;
break;
}
}
dev_info(&pdev->dev, "driver configured for %s silicon (rev: %d)\n",
isci_si_rev == ISCI_SI_REVA0 ? "A0" :
isci_si_rev == ISCI_SI_REVA2 ? "A2" : "B0", pdev->revision);
}
static int __devinit isci_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
struct isci_pci_info *pci_info;
int err, i;
struct isci_host *isci_host;
const struct firmware *fw = NULL;
struct isci_orom *orom;
char *source = "(platform)";
check_si_rev(pdev);
pci_info = devm_kzalloc(&pdev->dev, sizeof(*pci_info), GFP_KERNEL);
if (!pci_info)
return -ENOMEM;
pci_set_drvdata(pdev, pci_info);
if (efi_enabled)
orom = isci_get_efi_var(pdev);
else
orom = isci_request_oprom(pdev);
if (!orom) {
source = "(firmware)";
orom = isci_request_firmware(pdev, fw);
if (!orom) {
/* TODO convert this to WARN_TAINT_ONCE once the
* orom/efi parameter support is widely available
*/
dev_warn(&pdev->dev,
"Loading user firmware failed, using default "
"values\n");
dev_warn(&pdev->dev,
"Default OEM configuration being used: 4 "
"narrow ports, and default SAS Addresses\n");
}
}
if (orom)
dev_info(&pdev->dev,
"OEM SAS parameters (version: %u.%u) loaded %s\n",
(orom->hdr.version & 0xf0) >> 4,
(orom->hdr.version & 0xf), source);
pci_info->orom = orom;
err = isci_pci_init(pdev);
if (err)
return err;
for (i = 0; i < num_controllers(pdev); i++) {
struct isci_host *h = isci_host_alloc(pdev, i);
if (!h) {
err = -ENOMEM;
goto err_host_alloc;
}
pci_info->hosts[i] = h;
}
err = isci_setup_interrupts(pdev);
if (err)
goto err_host_alloc;
for_each_isci_host(i, isci_host, pdev)
scsi_scan_host(isci_host->shost);
return 0;
err_host_alloc:
for_each_isci_host(i, isci_host, pdev)
isci_unregister(isci_host);
return err;
}
static void __devexit isci_pci_remove(struct pci_dev *pdev)
{
struct isci_host *isci_host;
int i;
for_each_isci_host(i, isci_host, pdev) {
isci_unregister(isci_host);
isci_host_deinit(isci_host);
scic_controller_disable_interrupts(isci_host->core_controller);
}
}
static struct pci_driver isci_pci_driver = {
.name = DRV_NAME,
.id_table = isci_id_table,
.probe = isci_pci_probe,
.remove = __devexit_p(isci_pci_remove),
};
static __init int isci_init(void)
{
int err;
pr_info("%s: Intel(R) C600 SAS Controller Driver\n", DRV_NAME);
isci_transport_template = sas_domain_attach_transport(&isci_transport_ops);
if (!isci_transport_template)
return -ENOMEM;
err = pci_register_driver(&isci_pci_driver);
if (err)
sas_release_transport(isci_transport_template);
return err;
}
static __exit void isci_exit(void)
{
pci_unregister_driver(&isci_pci_driver);
sas_release_transport(isci_transport_template);
}
MODULE_LICENSE("Dual BSD/GPL");
MODULE_FIRMWARE(ISCI_FW_NAME);
module_init(isci_init);
module_exit(isci_exit);
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