1 /*
2  * This file is provided under a dual BSD/GPLv2 license.  When using or
3  * redistributing this file, you may do so under either license.
4  *
5  * GPL LICENSE SUMMARY
6  *
7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of version 2 of the GNU General Public License as
11  * published by the Free Software Foundation.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
21  * The full GNU General Public License is included in this distribution
22  * in the file called LICENSE.GPL.
23  *
24  * BSD LICENSE
25  *
26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
27  * All rights reserved.
28  *
29  * Redistribution and use in source and binary forms, with or without
30  * modification, are permitted provided that the following conditions
31  * are met:
32  *
33  *   * Redistributions of source code must retain the above copyright
34  *     notice, this list of conditions and the following disclaimer.
35  *   * Redistributions in binary form must reproduce the above copyright
36  *     notice, this list of conditions and the following disclaimer in
37  *     the documentation and/or other materials provided with the
38  *     distribution.
39  *   * Neither the name of Intel Corporation nor the names of its
40  *     contributors may be used to endorse or promote products derived
41  *     from this software without specific prior written permission.
42  *
43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
54  */
55 
56 #ifndef _ISCI_REQUEST_H_
57 #define _ISCI_REQUEST_H_
58 
59 #include "isci.h"
60 #include "host.h"
61 #include "scu_task_context.h"
62 
63 /**
64  * isci_stp_request - extra request infrastructure to handle pio/atapi protocol
65  * @pio_len - number of bytes requested at PIO setup
66  * @status - pio setup ending status value to tell us if we need
67  *	     to wait for another fis or if the transfer is complete.  Upon
68  *           receipt of a d2h fis this will be the status field of that fis.
69  * @sgl - track pio transfer progress as we iterate through the sgl
70  */
71 struct isci_stp_request {
72 	u32 pio_len;
73 	u8 status;
74 
75 	struct isci_stp_pio_sgl {
76 		int index;
77 		u8 set;
78 		u32 offset;
79 	} sgl;
80 };
81 
82 struct isci_request {
83 	#define IREQ_COMPLETE_IN_TARGET 0
84 	#define IREQ_TERMINATED 1
85 	#define IREQ_TMF 2
86 	#define IREQ_ACTIVE 3
87 	#define IREQ_PENDING_ABORT 4 /* Set == device was not suspended yet */
88 	#define IREQ_TC_ABORT_POSTED 5
89 	#define IREQ_ABORT_PATH_ACTIVE 6
90 	#define IREQ_NO_AUTO_FREE_TAG 7 /* Set when being explicitly managed */
91 	unsigned long flags;
92 	/* XXX kill ttype and ttype_ptr, allocate full sas_task */
93 	union ttype_ptr_union {
94 		struct sas_task *io_task_ptr;   /* When ttype==io_task  */
95 		struct isci_tmf *tmf_task_ptr;  /* When ttype==tmf_task */
96 	} ttype_ptr;
97 	struct isci_host *isci_host;
98 	dma_addr_t request_daddr;
99 	dma_addr_t zero_scatter_daddr;
100 	unsigned int num_sg_entries;
101 	/* Note: "io_request_completion" is completed in two different ways
102 	 * depending on whether this is a TMF or regular request.
103 	 * - TMF requests are completed in the thread that started them;
104 	 * - regular requests are completed in the request completion callback
105 	 *   function.
106 	 * This difference in operation allows the aborter of a TMF request
107 	 * to be sure that once the TMF request completes, the I/O that the
108 	 * TMF was aborting is guaranteed to have completed.
109 	 *
110 	 * XXX kill io_request_completion
111 	 */
112 	struct completion *io_request_completion;
113 	struct sci_base_state_machine sm;
114 	struct isci_host *owning_controller;
115 	struct isci_remote_device *target_device;
116 	u16 io_tag;
117 	enum sas_protocol protocol;
118 	u32 scu_status; /* hardware result */
119 	u32 sci_status; /* upper layer disposition */
120 	u32 post_context;
121 	struct scu_task_context *tc;
122 	/* could be larger with sg chaining */
123 	#define SCU_SGL_SIZE ((SCI_MAX_SCATTER_GATHER_ELEMENTS + 1) / 2)
124 	struct scu_sgl_element_pair sg_table[SCU_SGL_SIZE] __attribute__ ((aligned(32)));
125 	/* This field is a pointer to the stored rx frame data.  It is used in
126 	 * STP internal requests and SMP response frames.  If this field is
127 	 * non-NULL the saved frame must be released on IO request completion.
128 	 */
129 	u32 saved_rx_frame_index;
130 
131 	union {
132 		struct {
133 			union {
134 				struct ssp_cmd_iu cmd;
135 				struct ssp_task_iu tmf;
136 			};
137 			union {
138 				struct ssp_response_iu rsp;
139 				u8 rsp_buf[SSP_RESP_IU_MAX_SIZE];
140 			};
141 		} ssp;
142 		struct {
143 			struct isci_stp_request req;
144 			struct host_to_dev_fis cmd;
145 			struct dev_to_host_fis rsp;
146 		} stp;
147 	};
148 };
149 
to_ireq(struct isci_stp_request * stp_req)150 static inline struct isci_request *to_ireq(struct isci_stp_request *stp_req)
151 {
152 	struct isci_request *ireq;
153 
154 	ireq = container_of(stp_req, typeof(*ireq), stp.req);
155 	return ireq;
156 }
157 
158 /**
159  * enum sci_base_request_states - request state machine states
160  *
161  * @SCI_REQ_INIT: Simply the initial state for the base request state machine.
162  *
163  * @SCI_REQ_CONSTRUCTED: This state indicates that the request has been
164  * constructed.  This state is entered from the INITIAL state.
165  *
166  * @SCI_REQ_STARTED: This state indicates that the request has been started.
167  * This state is entered from the CONSTRUCTED state.
168  *
169  * @SCI_REQ_STP_UDMA_WAIT_TC_COMP:
170  * @SCI_REQ_STP_UDMA_WAIT_D2H:
171  * @SCI_REQ_STP_NON_DATA_WAIT_H2D:
172  * @SCI_REQ_STP_NON_DATA_WAIT_D2H:
173  *
174  * @SCI_REQ_STP_PIO_WAIT_H2D: While in this state the IO request object is
175  * waiting for the TC completion notification for the H2D Register FIS
176  *
177  * @SCI_REQ_STP_PIO_WAIT_FRAME: While in this state the IO request object is
178  * waiting for either a PIO Setup FIS or a D2H register FIS.  The type of frame
179  * received is based on the result of the prior frame and line conditions.
180  *
181  * @SCI_REQ_STP_PIO_DATA_IN: While in this state the IO request object is
182  * waiting for a DATA frame from the device.
183  *
184  * @SCI_REQ_STP_PIO_DATA_OUT: While in this state the IO request object is
185  * waiting to transmit the next data frame to the device.
186  *
187  * @SCI_REQ_ATAPI_WAIT_H2D: While in this state the IO request object is
188  * waiting for the TC completion notification for the H2D Register FIS
189  *
190  * @SCI_REQ_ATAPI_WAIT_PIO_SETUP: While in this state the IO request object is
191  * waiting for either a PIO Setup.
192  *
193  * @SCI_REQ_ATAPI_WAIT_D2H: The non-data IO transit to this state in this state
194  * after receiving TC completion. While in this state IO request object is
195  * waiting for D2H status frame as UF.
196  *
197  * @SCI_REQ_ATAPI_WAIT_TC_COMP: When transmitting raw frames hardware reports
198  * task context completion after every frame submission, so in the
199  * non-accelerated case we need to expect the completion for the "cdb" frame.
200  *
201  * @SCI_REQ_TASK_WAIT_TC_COMP: The AWAIT_TC_COMPLETION sub-state indicates that
202  * the started raw task management request is waiting for the transmission of
203  * the initial frame (i.e. command, task, etc.).
204  *
205  * @SCI_REQ_TASK_WAIT_TC_RESP: This sub-state indicates that the started task
206  * management request is waiting for the reception of an unsolicited frame
207  * (i.e.  response IU).
208  *
209  * @SCI_REQ_SMP_WAIT_RESP: This sub-state indicates that the started task
210  * management request is waiting for the reception of an unsolicited frame
211  * (i.e.  response IU).
212  *
213  * @SCI_REQ_SMP_WAIT_TC_COMP: The AWAIT_TC_COMPLETION sub-state indicates that
214  * the started SMP request is waiting for the transmission of the initial frame
215  * (i.e.  command, task, etc.).
216  *
217  * @SCI_REQ_COMPLETED: This state indicates that the request has completed.
218  * This state is entered from the STARTED state. This state is entered from the
219  * ABORTING state.
220  *
221  * @SCI_REQ_ABORTING: This state indicates that the request is in the process
222  * of being terminated/aborted.  This state is entered from the CONSTRUCTED
223  * state.  This state is entered from the STARTED state.
224  *
225  * @SCI_REQ_FINAL: Simply the final state for the base request state machine.
226  */
227 #define REQUEST_STATES {\
228 	C(REQ_INIT),\
229 	C(REQ_CONSTRUCTED),\
230 	C(REQ_STARTED),\
231 	C(REQ_STP_UDMA_WAIT_TC_COMP),\
232 	C(REQ_STP_UDMA_WAIT_D2H),\
233 	C(REQ_STP_NON_DATA_WAIT_H2D),\
234 	C(REQ_STP_NON_DATA_WAIT_D2H),\
235 	C(REQ_STP_PIO_WAIT_H2D),\
236 	C(REQ_STP_PIO_WAIT_FRAME),\
237 	C(REQ_STP_PIO_DATA_IN),\
238 	C(REQ_STP_PIO_DATA_OUT),\
239 	C(REQ_ATAPI_WAIT_H2D),\
240 	C(REQ_ATAPI_WAIT_PIO_SETUP),\
241 	C(REQ_ATAPI_WAIT_D2H),\
242 	C(REQ_ATAPI_WAIT_TC_COMP),\
243 	C(REQ_TASK_WAIT_TC_COMP),\
244 	C(REQ_TASK_WAIT_TC_RESP),\
245 	C(REQ_SMP_WAIT_RESP),\
246 	C(REQ_SMP_WAIT_TC_COMP),\
247 	C(REQ_COMPLETED),\
248 	C(REQ_ABORTING),\
249 	C(REQ_FINAL),\
250 	}
251 #undef C
252 #define C(a) SCI_##a
253 enum sci_base_request_states REQUEST_STATES;
254 #undef C
255 const char *req_state_name(enum sci_base_request_states state);
256 
257 enum sci_status sci_request_start(struct isci_request *ireq);
258 enum sci_status sci_io_request_terminate(struct isci_request *ireq);
259 enum sci_status
260 sci_io_request_event_handler(struct isci_request *ireq,
261 				  u32 event_code);
262 enum sci_status
263 sci_io_request_frame_handler(struct isci_request *ireq,
264 				  u32 frame_index);
265 enum sci_status
266 sci_task_request_terminate(struct isci_request *ireq);
267 extern enum sci_status
268 sci_request_complete(struct isci_request *ireq);
269 extern enum sci_status
270 sci_io_request_tc_completion(struct isci_request *ireq, u32 code);
271 
272 /* XXX open code in caller */
273 static inline dma_addr_t
sci_io_request_get_dma_addr(struct isci_request * ireq,void * virt_addr)274 sci_io_request_get_dma_addr(struct isci_request *ireq, void *virt_addr)
275 {
276 
277 	char *requested_addr = (char *)virt_addr;
278 	char *base_addr = (char *)ireq;
279 
280 	BUG_ON(requested_addr < base_addr);
281 	BUG_ON((requested_addr - base_addr) >= sizeof(*ireq));
282 
283 	return ireq->request_daddr + (requested_addr - base_addr);
284 }
285 
286 #define isci_request_access_task(req) ((req)->ttype_ptr.io_task_ptr)
287 
288 #define isci_request_access_tmf(req) ((req)->ttype_ptr.tmf_task_ptr)
289 
290 struct isci_request *isci_tmf_request_from_tag(struct isci_host *ihost,
291 					       struct isci_tmf *isci_tmf,
292 					       u16 tag);
293 int isci_request_execute(struct isci_host *ihost, struct isci_remote_device *idev,
294 			 struct sas_task *task, struct isci_request *ireq);
295 struct isci_request *isci_io_request_from_tag(struct isci_host *ihost,
296 					      struct sas_task *task,
297 					      u16 tag);
298 enum sci_status
299 sci_task_request_construct(struct isci_host *ihost,
300 			    struct isci_remote_device *idev,
301 			    u16 io_tag,
302 			    struct isci_request *ireq);
303 enum sci_status sci_task_request_construct_ssp(struct isci_request *ireq);
304 void sci_smp_request_copy_response(struct isci_request *ireq);
305 
isci_task_is_ncq_recovery(struct sas_task * task)306 static inline int isci_task_is_ncq_recovery(struct sas_task *task)
307 {
308 	return (sas_protocol_ata(task->task_proto) &&
309 		task->ata_task.fis.command == ATA_CMD_READ_LOG_EXT &&
310 		task->ata_task.fis.lbal == ATA_LOG_SATA_NCQ);
311 
312 }
313 #endif /* !defined(_ISCI_REQUEST_H_) */
314