Merge git://git.kernel.org/pub/scm/linux/kernel/git/djbw/isci

1 files changed, 367 insertions, 0 deletions

diff --git a/drivers/scsi/isci/task.h b/drivers/scsi/isci/task.h
new file mode 100644
index 00000000000..4a7fa90287e
--- /dev/null
+++ b/drivers/scsi/isci/task.h
@@ -0,0 +1,367 @@
+/*
+ * 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.
+ */
+#ifndef _ISCI_TASK_H_
+#define _ISCI_TASK_H_
+
+#include <scsi/sas_ata.h>
+#include "host.h"
+
+struct isci_request;
+
+/**
+ * enum isci_tmf_cb_state - This enum defines the possible states in which the
+ *    TMF callback function is invoked during the TMF execution process.
+ *
+ *
+ */
+enum isci_tmf_cb_state {
+
+	isci_tmf_init_state = 0,
+	isci_tmf_started,
+	isci_tmf_timed_out
+};
+
+/**
+ * enum isci_tmf_function_codes - This enum defines the possible preparations
+ *    of task management requests.
+ *
+ *
+ */
+enum isci_tmf_function_codes {
+
+	isci_tmf_func_none      = 0,
+	isci_tmf_ssp_task_abort = TMF_ABORT_TASK,
+	isci_tmf_ssp_lun_reset  = TMF_LU_RESET,
+	isci_tmf_sata_srst_high = TMF_LU_RESET + 0x100, /* Non SCSI */
+	isci_tmf_sata_srst_low  = TMF_LU_RESET + 0x101  /* Non SCSI */
+};
+/**
+ * struct isci_tmf - This class represents the task management object which
+ *    acts as an interface to libsas for processing task management requests
+ *
+ *
+ */
+struct isci_tmf {
+
+	struct completion *complete;
+	enum sas_protocol proto;
+	union {
+		struct ssp_response_iu resp_iu;
+		struct dev_to_host_fis d2h_fis;
+		u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
+	} resp;
+	unsigned char lun[8];
+	u16 io_tag;
+	struct isci_remote_device *device;
+	enum isci_tmf_function_codes tmf_code;
+	int status;
+
+	/* The optional callback function allows the user process to
+	 * track the TMF transmit / timeout conditions.
+	 */
+	void (*cb_state_func)(
+		enum isci_tmf_cb_state,
+		struct isci_tmf *, void *);
+	void *cb_data;
+
+};
+
+static inline void isci_print_tmf(struct isci_tmf *tmf)
+{
+	if (SAS_PROTOCOL_SATA == tmf->proto)
+		dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
+			"%s: status = %x\n"
+			"tmf->resp.d2h_fis.status = %x\n"
+			"tmf->resp.d2h_fis.error = %x\n",
+			__func__,
+			tmf->status,
+			tmf->resp.d2h_fis.status,
+			tmf->resp.d2h_fis.error);
+	else
+		dev_dbg(&tmf->device->isci_port->isci_host->pdev->dev,
+			"%s: status = %x\n"
+			"tmf->resp.resp_iu.data_present = %x\n"
+			"tmf->resp.resp_iu.status = %x\n"
+			"tmf->resp.resp_iu.data_length = %x\n"
+			"tmf->resp.resp_iu.data[0] = %x\n"
+			"tmf->resp.resp_iu.data[1] = %x\n"
+			"tmf->resp.resp_iu.data[2] = %x\n"
+			"tmf->resp.resp_iu.data[3] = %x\n",
+			__func__,
+			tmf->status,
+			tmf->resp.resp_iu.datapres,
+			tmf->resp.resp_iu.status,
+			be32_to_cpu(tmf->resp.resp_iu.response_data_len),
+			tmf->resp.resp_iu.resp_data[0],
+			tmf->resp.resp_iu.resp_data[1],
+			tmf->resp.resp_iu.resp_data[2],
+			tmf->resp.resp_iu.resp_data[3]);
+}
+
+
+int isci_task_execute_task(
+	struct sas_task *task,
+	int num,
+	gfp_t gfp_flags);
+
+int isci_task_abort_task(
+	struct sas_task *task);
+
+int isci_task_abort_task_set(
+	struct domain_device *d_device,
+	u8 *lun);
+
+int isci_task_clear_aca(
+	struct domain_device *d_device,
+	u8 *lun);
+
+int isci_task_clear_task_set(
+	struct domain_device *d_device,
+	u8 *lun);
+
+int isci_task_query_task(
+	struct sas_task *task);
+
+int isci_task_lu_reset(
+	struct domain_device *d_device,
+	u8 *lun);
+
+int isci_task_clear_nexus_port(
+	struct asd_sas_port *port);
+
+int isci_task_clear_nexus_ha(
+	struct sas_ha_struct *ha);
+
+int isci_task_I_T_nexus_reset(
+	struct domain_device *d_device);
+
+void isci_task_request_complete(
+	struct isci_host *isci_host,
+	struct isci_request *request,
+	enum sci_task_status completion_status);
+
+u16 isci_task_ssp_request_get_io_tag_to_manage(
+	struct isci_request *request);
+
+u8 isci_task_ssp_request_get_function(
+	struct isci_request *request);
+
+
+void *isci_task_ssp_request_get_response_data_address(
+	struct isci_request *request);
+
+u32 isci_task_ssp_request_get_response_data_length(
+	struct isci_request *request);
+
+int isci_queuecommand(
+	struct scsi_cmnd *scsi_cmd,
+	void (*donefunc)(struct scsi_cmnd *));
+
+int isci_bus_reset_handler(struct scsi_cmnd *cmd);
+
+/**
+ * enum isci_completion_selection - This enum defines the possible actions to
+ *    take with respect to a given request's notification back to libsas.
+ *
+ *
+ */
+enum isci_completion_selection {
+
+	isci_perform_normal_io_completion,      /* Normal notify (task_done) */
+	isci_perform_aborted_io_completion,     /* No notification.   */
+	isci_perform_error_io_completion        /* Use sas_task_abort */
+};
+
+static inline void isci_set_task_doneflags(
+	struct sas_task *task)
+{
+	/* Since no futher action will be taken on this task,
+	 * make sure to mark it complete from the lldd perspective.
+	 */
+	task->task_state_flags |= SAS_TASK_STATE_DONE;
+	task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
+	task->task_state_flags &= ~SAS_TASK_STATE_PENDING;
+}
+/**
+ * isci_task_all_done() - This function clears the task bits to indicate the
+ *    LLDD is done with the task.
+ *
+ *
+ */
+static inline void isci_task_all_done(
+	struct sas_task *task)
+{
+	unsigned long flags;
+
+	/* Since no futher action will be taken on this task,
+	 * make sure to mark it complete from the lldd perspective.
+	 */
+	spin_lock_irqsave(&task->task_state_lock, flags);
+	isci_set_task_doneflags(task);
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+}
+
+/**
+ * isci_task_set_completion_status() - This function sets the completion status
+ *    for the request.
+ * @task: This parameter is the completed request.
+ * @response: This parameter is the response code for the completed task.
+ * @status: This parameter is the status code for the completed task.
+ *
+* @return The new notification mode for the request.
+*/
+static inline enum isci_completion_selection
+isci_task_set_completion_status(
+	struct sas_task *task,
+	enum service_response response,
+	enum exec_status status,
+	enum isci_completion_selection task_notification_selection)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&task->task_state_lock, flags);
+
+	/* If a device reset is being indicated, make sure the I/O
+	* is in the error path.
+	*/
+	if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET) {
+		/* Fail the I/O to make sure it goes into the error path. */
+		response = SAS_TASK_UNDELIVERED;
+		status = SAM_STAT_TASK_ABORTED;
+
+		task_notification_selection = isci_perform_error_io_completion;
+	}
+	task->task_status.resp = response;
+	task->task_status.stat = status;
+
+	switch (task_notification_selection) {
+
+	case isci_perform_error_io_completion:
+
+		if (task->task_proto == SAS_PROTOCOL_SMP) {
+			/* There is no error escalation in the SMP case.
+			 * Convert to a normal completion to avoid the
+			 * timeout in the discovery path and to let the
+			 * next action take place quickly.
+			 */
+			task_notification_selection
+				= isci_perform_normal_io_completion;
+
+			/* Fall through to the normal case... */
+		} else {
+			/* Use sas_task_abort */
+			/* Leave SAS_TASK_STATE_DONE clear
+			 * Leave SAS_TASK_AT_INITIATOR set.
+			 */
+			break;
+		}
+
+	case isci_perform_aborted_io_completion:
+		/* This path can occur with task-managed requests as well as
+		 * requests terminated because of LUN or device resets.
+		 */
+		/* Fall through to the normal case... */
+	case isci_perform_normal_io_completion:
+		/* Normal notification (task_done) */
+		isci_set_task_doneflags(task);
+		break;
+	default:
+		WARN_ONCE(1, "unknown task_notification_selection: %d\n",
+			 task_notification_selection);
+		break;
+	}
+
+	spin_unlock_irqrestore(&task->task_state_lock, flags);
+
+	return task_notification_selection;
+
+}
+/**
+* isci_execpath_callback() - This function is called from the task
+* execute path when the task needs to callback libsas about the submit-time
+* task failure.  The callback occurs either through the task's done function
+* or through sas_task_abort.  In the case of regular non-discovery SATA/STP I/O
+* requests, libsas takes the host lock before calling execute task.  Therefore
+* in this situation the host lock must be managed before calling the func.
+*
+* @ihost: This parameter is the controller to which the I/O request was sent.
+* @task: This parameter is the I/O request.
+* @func: This parameter is the function to call in the correct context.
+* @status: This parameter is the status code for the completed task.
+*
+*/
+static inline void isci_execpath_callback(struct isci_host *ihost,
+					  struct sas_task  *task,
+					  void (*func)(struct sas_task *))
+{
+	struct domain_device *dev = task->dev;
+
+	if (dev_is_sata(dev) && task->uldd_task) {
+		unsigned long flags;
+
+		/* Since we are still in the submit path, and since
+		 * libsas takes the host lock on behalf of SATA
+		 * devices before I/O starts (in the non-discovery case),
+		 * we need to unlock before we can call the callback function.
+		 */
+		raw_local_irq_save(flags);
+		spin_unlock(dev->sata_dev.ap->lock);
+		func(task);
+		spin_lock(dev->sata_dev.ap->lock);
+		raw_local_irq_restore(flags);
+	} else
+		func(task);
+}
+#endif /* !defined(_SCI_TASK_H_) */