2 * Serial Attached SCSI (SAS) Expander discovery and configuration
4 * Copyright (C) 2007 James E.J. Bottomley
5 * <James.Bottomley@HansenPartnership.com>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; version 2 only.
11 #include <linux/scatterlist.h>
12 #include <linux/blkdev.h>
13 #include <linux/slab.h>
15 #include "sas_internal.h"
17 #include <scsi/scsi_transport.h>
18 #include <scsi/scsi_transport_sas.h>
19 #include "../scsi_sas_internal.h"
21 static void sas_host_smp_discover(struct sas_ha_struct
*sas_ha
, u8
*resp_data
,
25 struct sas_rphy
*rphy
;
27 if (phy_id
>= sas_ha
->num_phys
) {
28 resp_data
[2] = SMP_RESP_NO_PHY
;
31 resp_data
[2] = SMP_RESP_FUNC_ACC
;
33 phy
= sas_ha
->sas_phy
[phy_id
]->phy
;
34 resp_data
[9] = phy_id
;
35 resp_data
[13] = phy
->negotiated_linkrate
;
36 memcpy(resp_data
+ 16, sas_ha
->sas_addr
, SAS_ADDR_SIZE
);
37 memcpy(resp_data
+ 24, sas_ha
->sas_phy
[phy_id
]->attached_sas_addr
,
39 resp_data
[40] = (phy
->minimum_linkrate
<< 4) |
40 phy
->minimum_linkrate_hw
;
41 resp_data
[41] = (phy
->maximum_linkrate
<< 4) |
42 phy
->maximum_linkrate_hw
;
44 if (!sas_ha
->sas_phy
[phy_id
]->port
||
45 !sas_ha
->sas_phy
[phy_id
]->port
->port_dev
)
48 rphy
= sas_ha
->sas_phy
[phy_id
]->port
->port_dev
->rphy
;
49 resp_data
[12] = rphy
->identify
.device_type
<< 4;
50 resp_data
[14] = rphy
->identify
.initiator_port_protocols
;
51 resp_data
[15] = rphy
->identify
.target_port_protocols
;
55 * to_sas_gpio_gp_bit - given the gpio frame data find the byte/bit position of 'od'
57 * @data: incoming bitstream (from frame)
58 * @index: requested data register index (from frame)
59 * @count: total number of registers in the bitstream (from frame)
60 * @bit: bit position of 'od' in the returned byte
62 * returns NULL if 'od' is not in 'data'
65 * "In GPIO_TX[1], bit 0 of byte 3 contains the first bit (i.e., OD0.0)
66 * and bit 7 of byte 0 contains the 32nd bit (i.e., OD10.1).
68 * In GPIO_TX[2], bit 0 of byte 3 contains the 33rd bit (i.e., OD10.2)
69 * and bit 7 of byte 0 contains the 64th bit (i.e., OD21.0)."
71 * The general-purpose (raw-bitstream) RX registers have the same layout
72 * although 'od' is renamed 'id' for 'input data'.
74 * SFF-8489 defines the behavior of the LEDs in response to the 'od' values.
76 static u8
*to_sas_gpio_gp_bit(unsigned int od
, u8
*data
, u8 index
, u8 count
, u8
*bit
)
81 /* gp registers start at index 1 */
85 index
--; /* make index 0-based */
97 *bit
= od
& ((1 << 3) - 1);
99 return &data
[reg
* 4 + byte
];
102 int try_test_sas_gpio_gp_bit(unsigned int od
, u8
*data
, u8 index
, u8 count
)
107 byte
= to_sas_gpio_gp_bit(od
, data
, index
, count
, &bit
);
111 return (*byte
>> bit
) & 1;
113 EXPORT_SYMBOL(try_test_sas_gpio_gp_bit
);
115 static int sas_host_smp_write_gpio(struct sas_ha_struct
*sas_ha
, u8
*resp_data
,
116 u8 reg_type
, u8 reg_index
, u8 reg_count
,
119 struct sas_internal
*i
= to_sas_internal(sas_ha
->core
.shost
->transportt
);
122 if (i
->dft
->lldd_write_gpio
== NULL
) {
123 resp_data
[2] = SMP_RESP_FUNC_UNK
;
127 written
= i
->dft
->lldd_write_gpio(sas_ha
, reg_type
, reg_index
,
128 reg_count
, req_data
);
131 resp_data
[2] = SMP_RESP_FUNC_FAILED
;
134 resp_data
[2] = SMP_RESP_FUNC_ACC
;
139 static void sas_report_phy_sata(struct sas_ha_struct
*sas_ha
, u8
*resp_data
,
142 struct sas_rphy
*rphy
;
143 struct dev_to_host_fis
*fis
;
146 if (phy_id
>= sas_ha
->num_phys
) {
147 resp_data
[2] = SMP_RESP_NO_PHY
;
151 resp_data
[2] = SMP_RESP_PHY_NO_SATA
;
153 if (!sas_ha
->sas_phy
[phy_id
]->port
)
156 rphy
= sas_ha
->sas_phy
[phy_id
]->port
->port_dev
->rphy
;
157 fis
= (struct dev_to_host_fis
*)
158 sas_ha
->sas_phy
[phy_id
]->port
->port_dev
->frame_rcvd
;
159 if (rphy
->identify
.target_port_protocols
!= SAS_PROTOCOL_SATA
)
162 resp_data
[2] = SMP_RESP_FUNC_ACC
;
163 resp_data
[9] = phy_id
;
164 memcpy(resp_data
+ 16, sas_ha
->sas_phy
[phy_id
]->attached_sas_addr
,
167 /* check to see if we have a valid d2h fis */
168 if (fis
->fis_type
!= 0x34)
171 /* the d2h fis is required by the standard to be in LE format */
172 for (i
= 0; i
< 20; i
+= 4) {
173 u8
*dst
= resp_data
+ 24 + i
, *src
=
174 &sas_ha
->sas_phy
[phy_id
]->port
->port_dev
->frame_rcvd
[i
];
182 static void sas_phy_control(struct sas_ha_struct
*sas_ha
, u8 phy_id
,
183 u8 phy_op
, enum sas_linkrate min
,
184 enum sas_linkrate max
, u8
*resp_data
)
186 struct sas_internal
*i
=
187 to_sas_internal(sas_ha
->core
.shost
->transportt
);
188 struct sas_phy_linkrates rates
;
190 if (phy_id
>= sas_ha
->num_phys
) {
191 resp_data
[2] = SMP_RESP_NO_PHY
;
196 case PHY_FUNC_LINK_RESET
:
197 case PHY_FUNC_HARD_RESET
:
198 case PHY_FUNC_DISABLE
:
199 case PHY_FUNC_CLEAR_ERROR_LOG
:
200 case PHY_FUNC_CLEAR_AFFIL
:
201 case PHY_FUNC_TX_SATA_PS_SIGNAL
:
205 resp_data
[2] = SMP_RESP_PHY_UNK_OP
;
209 rates
.minimum_linkrate
= min
;
210 rates
.maximum_linkrate
= max
;
212 if (i
->dft
->lldd_control_phy(sas_ha
->sas_phy
[phy_id
], phy_op
, &rates
))
213 resp_data
[2] = SMP_RESP_FUNC_FAILED
;
215 resp_data
[2] = SMP_RESP_FUNC_ACC
;
218 int sas_smp_host_handler(struct Scsi_Host
*shost
, struct request
*req
,
221 u8
*req_data
= NULL
, *resp_data
= NULL
, *buf
;
222 struct sas_ha_struct
*sas_ha
= SHOST_TO_SAS_HA(shost
);
225 /* eight is the minimum size for request and response frames */
226 if (blk_rq_bytes(req
) < 8 || blk_rq_bytes(rsp
) < 8)
229 if (bio_offset(req
->bio
) + blk_rq_bytes(req
) > PAGE_SIZE
||
230 bio_offset(rsp
->bio
) + blk_rq_bytes(rsp
) > PAGE_SIZE
) {
231 shost_printk(KERN_ERR
, shost
,
232 "SMP request/response frame crosses page boundary");
236 req_data
= kzalloc(blk_rq_bytes(req
), GFP_KERNEL
);
238 /* make sure frame can always be built ... we copy
239 * back only the requested length */
240 resp_data
= kzalloc(max(blk_rq_bytes(rsp
), 128U), GFP_KERNEL
);
242 if (!req_data
|| !resp_data
) {
248 buf
= kmap_atomic(bio_page(req
->bio
), KM_USER0
) + bio_offset(req
->bio
);
249 memcpy(req_data
, buf
, blk_rq_bytes(req
));
250 kunmap_atomic(buf
- bio_offset(req
->bio
), KM_USER0
);
253 if (req_data
[0] != SMP_REQUEST
)
256 /* always succeeds ... even if we can't process the request
257 * the result is in the response frame */
260 /* set up default don't know response */
261 resp_data
[0] = SMP_RESPONSE
;
262 resp_data
[1] = req_data
[1];
263 resp_data
[2] = SMP_RESP_FUNC_UNK
;
265 switch (req_data
[1]) {
266 case SMP_REPORT_GENERAL
:
268 rsp
->resid_len
-= 32;
269 resp_data
[2] = SMP_RESP_FUNC_ACC
;
270 resp_data
[9] = sas_ha
->num_phys
;
273 case SMP_REPORT_MANUF_INFO
:
275 rsp
->resid_len
-= 64;
276 resp_data
[2] = SMP_RESP_FUNC_ACC
;
277 memcpy(resp_data
+ 12, shost
->hostt
->name
,
278 SAS_EXPANDER_VENDOR_ID_LEN
);
279 memcpy(resp_data
+ 20, "libsas virt phy",
280 SAS_EXPANDER_PRODUCT_ID_LEN
);
283 case SMP_READ_GPIO_REG
:
284 /* FIXME: need GPIO support in the transport class */
288 req
->resid_len
-= 16;
289 if ((int)req
->resid_len
< 0) {
294 rsp
->resid_len
-= 56;
295 sas_host_smp_discover(sas_ha
, resp_data
, req_data
[9]);
298 case SMP_REPORT_PHY_ERR_LOG
:
299 /* FIXME: could implement this with additional
300 * libsas callbacks providing the HW supports it */
303 case SMP_REPORT_PHY_SATA
:
304 req
->resid_len
-= 16;
305 if ((int)req
->resid_len
< 0) {
310 rsp
->resid_len
-= 60;
311 sas_report_phy_sata(sas_ha
, resp_data
, req_data
[9]);
314 case SMP_REPORT_ROUTE_INFO
:
315 /* Can't implement; hosts have no routes */
318 case SMP_WRITE_GPIO_REG
: {
320 const int base_frame_size
= 11;
321 int to_write
= req_data
[4];
323 if (blk_rq_bytes(req
) < base_frame_size
+ to_write
* 4 ||
324 req
->resid_len
< base_frame_size
+ to_write
* 4) {
325 resp_data
[2] = SMP_RESP_INV_FRM_LEN
;
329 to_write
= sas_host_smp_write_gpio(sas_ha
, resp_data
, req_data
[2],
330 req_data
[3], to_write
, &req_data
[8]);
331 req
->resid_len
-= base_frame_size
+ to_write
* 4;
336 case SMP_CONF_ROUTE_INFO
:
337 /* Can't implement; hosts have no routes */
340 case SMP_PHY_CONTROL
:
341 req
->resid_len
-= 44;
342 if ((int)req
->resid_len
< 0) {
348 sas_phy_control(sas_ha
, req_data
[9], req_data
[10],
349 req_data
[32] >> 4, req_data
[33] >> 4,
353 case SMP_PHY_TEST_FUNCTION
:
354 /* FIXME: should this be implemented? */
358 /* probably a 2.0 function */
363 buf
= kmap_atomic(bio_page(rsp
->bio
), KM_USER0
) + bio_offset(rsp
->bio
);
364 memcpy(buf
, resp_data
, blk_rq_bytes(rsp
));
365 flush_kernel_dcache_page(bio_page(rsp
->bio
));
366 kunmap_atomic(buf
- bio_offset(rsp
->bio
), KM_USER0
);