linux/drivers/scsi/isci/host.c
Dan Williams b7645818cf isci: make command/response iu explicit request object members
Final elimination of the anonymous data at the end of the request
structure.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2011-07-03 04:04:47 -07:00

460 lines
14 KiB
C

/*
* 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 "isci.h"
#include "scic_io_request.h"
#include "scic_port.h"
#include "port.h"
#include "request.h"
#include "host.h"
#include "probe_roms.h"
#include "scic_sds_controller.h"
irqreturn_t isci_msix_isr(int vec, void *data)
{
struct isci_host *ihost = data;
if (scic_sds_controller_isr(&ihost->sci))
tasklet_schedule(&ihost->completion_tasklet);
return IRQ_HANDLED;
}
irqreturn_t isci_intx_isr(int vec, void *data)
{
irqreturn_t ret = IRQ_NONE;
struct isci_host *ihost = data;
struct scic_sds_controller *scic = &ihost->sci;
if (scic_sds_controller_isr(scic)) {
writel(SMU_ISR_COMPLETION, &scic->smu_registers->interrupt_status);
tasklet_schedule(&ihost->completion_tasklet);
ret = IRQ_HANDLED;
} else if (scic_sds_controller_error_isr(scic)) {
spin_lock(&ihost->scic_lock);
scic_sds_controller_error_handler(scic);
spin_unlock(&ihost->scic_lock);
ret = IRQ_HANDLED;
}
return ret;
}
irqreturn_t isci_error_isr(int vec, void *data)
{
struct isci_host *ihost = data;
if (scic_sds_controller_error_isr(&ihost->sci))
scic_sds_controller_error_handler(&ihost->sci);
return IRQ_HANDLED;
}
/**
* isci_host_start_complete() - This function is called by the core library,
* through the ISCI Module, to indicate controller start status.
* @isci_host: This parameter specifies the ISCI host object
* @completion_status: This parameter specifies the completion status from the
* core library.
*
*/
void isci_host_start_complete(struct isci_host *ihost, enum sci_status completion_status)
{
if (completion_status != SCI_SUCCESS)
dev_info(&ihost->pdev->dev,
"controller start timed out, continuing...\n");
isci_host_change_state(ihost, isci_ready);
clear_bit(IHOST_START_PENDING, &ihost->flags);
wake_up(&ihost->eventq);
}
int isci_host_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;
if (test_bit(IHOST_START_PENDING, &ihost->flags))
return 0;
/* todo: use sas_flush_discovery once it is upstream */
scsi_flush_work(shost);
scsi_flush_work(shost);
dev_dbg(&ihost->pdev->dev,
"%s: ihost->status = %d, time = %ld\n",
__func__, isci_host_get_state(ihost), time);
return 1;
}
void isci_host_scan_start(struct Scsi_Host *shost)
{
struct isci_host *ihost = SHOST_TO_SAS_HA(shost)->lldd_ha;
unsigned long tmo = scic_controller_get_suggested_start_timeout(&ihost->sci);
set_bit(IHOST_START_PENDING, &ihost->flags);
spin_lock_irq(&ihost->scic_lock);
scic_controller_start(&ihost->sci, tmo);
scic_controller_enable_interrupts(&ihost->sci);
spin_unlock_irq(&ihost->scic_lock);
}
void isci_host_stop_complete(struct isci_host *ihost, enum sci_status completion_status)
{
isci_host_change_state(ihost, isci_stopped);
scic_controller_disable_interrupts(&ihost->sci);
clear_bit(IHOST_STOP_PENDING, &ihost->flags);
wake_up(&ihost->eventq);
}
/**
* isci_host_completion_routine() - This function is the delayed service
* routine that calls the sci core library's completion handler. It's
* scheduled as a tasklet from the interrupt service routine when interrupts
* in use, or set as the timeout function in polled mode.
* @data: This parameter specifies the ISCI host object
*
*/
static void isci_host_completion_routine(unsigned long data)
{
struct isci_host *isci_host = (struct isci_host *)data;
struct list_head completed_request_list;
struct list_head errored_request_list;
struct list_head *current_position;
struct list_head *next_position;
struct isci_request *request;
struct isci_request *next_request;
struct sas_task *task;
INIT_LIST_HEAD(&completed_request_list);
INIT_LIST_HEAD(&errored_request_list);
spin_lock_irq(&isci_host->scic_lock);
scic_sds_controller_completion_handler(&isci_host->sci);
/* Take the lists of completed I/Os from the host. */
list_splice_init(&isci_host->requests_to_complete,
&completed_request_list);
/* Take the list of errored I/Os from the host. */
list_splice_init(&isci_host->requests_to_errorback,
&errored_request_list);
spin_unlock_irq(&isci_host->scic_lock);
/* Process any completions in the lists. */
list_for_each_safe(current_position, next_position,
&completed_request_list) {
request = list_entry(current_position, struct isci_request,
completed_node);
task = isci_request_access_task(request);
/* Normal notification (task_done) */
dev_dbg(&isci_host->pdev->dev,
"%s: Normal - request/task = %p/%p\n",
__func__,
request,
task);
/* Return the task to libsas */
if (task != NULL) {
task->lldd_task = NULL;
if (!(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
/* If the task is already in the abort path,
* the task_done callback cannot be called.
*/
task->task_done(task);
}
}
/* Free the request object. */
isci_request_free(isci_host, request);
}
list_for_each_entry_safe(request, next_request, &errored_request_list,
completed_node) {
task = isci_request_access_task(request);
/* Use sas_task_abort */
dev_warn(&isci_host->pdev->dev,
"%s: Error - request/task = %p/%p\n",
__func__,
request,
task);
if (task != NULL) {
/* Put the task into the abort path if it's not there
* already.
*/
if (!(task->task_state_flags & SAS_TASK_STATE_ABORTED))
sas_task_abort(task);
} else {
/* This is a case where the request has completed with a
* status such that it needed further target servicing,
* but the sas_task reference has already been removed
* from the request. Since it was errored, it was not
* being aborted, so there is nothing to do except free
* it.
*/
spin_lock_irq(&isci_host->scic_lock);
/* Remove the request from the remote device's list
* of pending requests.
*/
list_del_init(&request->dev_node);
spin_unlock_irq(&isci_host->scic_lock);
/* Free the request object. */
isci_request_free(isci_host, request);
}
}
}
void isci_host_deinit(struct isci_host *ihost)
{
int i;
isci_host_change_state(ihost, isci_stopping);
for (i = 0; i < SCI_MAX_PORTS; i++) {
struct isci_port *iport = &ihost->ports[i];
struct isci_remote_device *idev, *d;
list_for_each_entry_safe(idev, d, &iport->remote_dev_list, node) {
isci_remote_device_change_state(idev, isci_stopping);
isci_remote_device_stop(ihost, idev);
}
}
set_bit(IHOST_STOP_PENDING, &ihost->flags);
spin_lock_irq(&ihost->scic_lock);
scic_controller_stop(&ihost->sci, SCIC_CONTROLLER_STOP_TIMEOUT);
spin_unlock_irq(&ihost->scic_lock);
wait_for_stop(ihost);
scic_controller_reset(&ihost->sci);
isci_timer_list_destroy(ihost);
}
static void __iomem *scu_base(struct isci_host *isci_host)
{
struct pci_dev *pdev = isci_host->pdev;
int id = isci_host->id;
return pcim_iomap_table(pdev)[SCI_SCU_BAR * 2] + SCI_SCU_BAR_SIZE * id;
}
static void __iomem *smu_base(struct isci_host *isci_host)
{
struct pci_dev *pdev = isci_host->pdev;
int id = isci_host->id;
return pcim_iomap_table(pdev)[SCI_SMU_BAR * 2] + SCI_SMU_BAR_SIZE * id;
}
static void isci_user_parameters_get(
struct isci_host *isci_host,
union scic_user_parameters *scic_user_params)
{
struct scic_sds_user_parameters *u = &scic_user_params->sds1;
int i;
for (i = 0; i < SCI_MAX_PHYS; i++) {
struct sci_phy_user_params *u_phy = &u->phys[i];
u_phy->max_speed_generation = phy_gen;
/* we are not exporting these for now */
u_phy->align_insertion_frequency = 0x7f;
u_phy->in_connection_align_insertion_frequency = 0xff;
u_phy->notify_enable_spin_up_insertion_frequency = 0x33;
}
u->stp_inactivity_timeout = stp_inactive_to;
u->ssp_inactivity_timeout = ssp_inactive_to;
u->stp_max_occupancy_timeout = stp_max_occ_to;
u->ssp_max_occupancy_timeout = ssp_max_occ_to;
u->no_outbound_task_timeout = no_outbound_task_to;
u->max_number_concurrent_device_spin_up = max_concurr_spinup;
}
int isci_host_init(struct isci_host *isci_host)
{
int err = 0, i;
enum sci_status status;
union scic_oem_parameters oem;
union scic_user_parameters scic_user_params;
struct isci_pci_info *pci_info = to_pci_info(isci_host->pdev);
isci_timer_list_construct(isci_host);
spin_lock_init(&isci_host->state_lock);
spin_lock_init(&isci_host->scic_lock);
spin_lock_init(&isci_host->queue_lock);
init_waitqueue_head(&isci_host->eventq);
isci_host_change_state(isci_host, isci_starting);
isci_host->can_queue = ISCI_CAN_QUEUE_VAL;
status = scic_controller_construct(&isci_host->sci, scu_base(isci_host),
smu_base(isci_host));
if (status != SCI_SUCCESS) {
dev_err(&isci_host->pdev->dev,
"%s: scic_controller_construct failed - status = %x\n",
__func__,
status);
return -ENODEV;
}
isci_host->sas_ha.dev = &isci_host->pdev->dev;
isci_host->sas_ha.lldd_ha = isci_host;
/*
* grab initial values stored in the controller object for OEM and USER
* parameters
*/
isci_user_parameters_get(isci_host, &scic_user_params);
status = scic_user_parameters_set(&isci_host->sci,
&scic_user_params);
if (status != SCI_SUCCESS) {
dev_warn(&isci_host->pdev->dev,
"%s: scic_user_parameters_set failed\n",
__func__);
return -ENODEV;
}
scic_oem_parameters_get(&isci_host->sci, &oem);
/* grab any OEM parameters specified in orom */
if (pci_info->orom) {
status = isci_parse_oem_parameters(&oem,
pci_info->orom,
isci_host->id);
if (status != SCI_SUCCESS) {
dev_warn(&isci_host->pdev->dev,
"parsing firmware oem parameters failed\n");
return -EINVAL;
}
}
status = scic_oem_parameters_set(&isci_host->sci, &oem);
if (status != SCI_SUCCESS) {
dev_warn(&isci_host->pdev->dev,
"%s: scic_oem_parameters_set failed\n",
__func__);
return -ENODEV;
}
tasklet_init(&isci_host->completion_tasklet,
isci_host_completion_routine, (unsigned long)isci_host);
INIT_LIST_HEAD(&isci_host->requests_to_complete);
INIT_LIST_HEAD(&isci_host->requests_to_errorback);
spin_lock_irq(&isci_host->scic_lock);
status = scic_controller_initialize(&isci_host->sci);
spin_unlock_irq(&isci_host->scic_lock);
if (status != SCI_SUCCESS) {
dev_warn(&isci_host->pdev->dev,
"%s: scic_controller_initialize failed -"
" status = 0x%x\n",
__func__, status);
return -ENODEV;
}
err = scic_controller_mem_init(&isci_host->sci);
if (err)
return err;
/*
* keep the pool alloc size around, will use it for a bounds checking
* when trying to convert virtual addresses to physical addresses
*/
isci_host->dma_pool_alloc_size = sizeof(struct isci_request) +
sizeof(struct scic_sds_request);
isci_host->dma_pool = dmam_pool_create(DRV_NAME, &isci_host->pdev->dev,
isci_host->dma_pool_alloc_size,
SLAB_HWCACHE_ALIGN, 0);
if (!isci_host->dma_pool)
return -ENOMEM;
for (i = 0; i < SCI_MAX_PORTS; i++)
isci_port_init(&isci_host->ports[i], isci_host, i);
for (i = 0; i < SCI_MAX_PHYS; i++)
isci_phy_init(&isci_host->phys[i], isci_host, i);
for (i = 0; i < SCI_MAX_REMOTE_DEVICES; i++) {
struct isci_remote_device *idev = &isci_host->devices[i];
INIT_LIST_HEAD(&idev->reqs_in_process);
INIT_LIST_HEAD(&idev->node);
spin_lock_init(&idev->state_lock);
}
return 0;
}