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b98e66fa JB |
1 | /* |
2 | * Serial Attached SCSI (SAS) Expander discovery and configuration | |
3 | * | |
4 | * Copyright (C) 2007 James E.J. Bottomley | |
5 | * <James.Bottomley@HansenPartnership.com> | |
6 | * | |
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. | |
10 | */ | |
11 | #include <linux/scatterlist.h> | |
12 | #include <linux/blkdev.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
09703660 | 14 | #include <linux/export.h> |
b98e66fa JB |
15 | |
16 | #include "sas_internal.h" | |
17 | ||
18 | #include <scsi/scsi_transport.h> | |
19 | #include <scsi/scsi_transport_sas.h> | |
20 | #include "../scsi_sas_internal.h" | |
21 | ||
22 | static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data, | |
23 | u8 phy_id) | |
24 | { | |
25 | struct sas_phy *phy; | |
26 | struct sas_rphy *rphy; | |
27 | ||
28 | if (phy_id >= sas_ha->num_phys) { | |
29 | resp_data[2] = SMP_RESP_NO_PHY; | |
30 | return; | |
31 | } | |
32 | resp_data[2] = SMP_RESP_FUNC_ACC; | |
33 | ||
34 | phy = sas_ha->sas_phy[phy_id]->phy; | |
35 | resp_data[9] = phy_id; | |
36 | resp_data[13] = phy->negotiated_linkrate; | |
37 | memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE); | |
38 | memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr, | |
39 | SAS_ADDR_SIZE); | |
40 | resp_data[40] = (phy->minimum_linkrate << 4) | | |
41 | phy->minimum_linkrate_hw; | |
42 | resp_data[41] = (phy->maximum_linkrate << 4) | | |
43 | phy->maximum_linkrate_hw; | |
44 | ||
45 | if (!sas_ha->sas_phy[phy_id]->port || | |
46 | !sas_ha->sas_phy[phy_id]->port->port_dev) | |
47 | return; | |
48 | ||
49 | rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; | |
50 | resp_data[12] = rphy->identify.device_type << 4; | |
51 | resp_data[14] = rphy->identify.initiator_port_protocols; | |
52 | resp_data[15] = rphy->identify.target_port_protocols; | |
53 | } | |
54 | ||
8ec6552f DW |
55 | /** |
56 | * to_sas_gpio_gp_bit - given the gpio frame data find the byte/bit position of 'od' | |
57 | * @od: od bit to find | |
58 | * @data: incoming bitstream (from frame) | |
59 | * @index: requested data register index (from frame) | |
60 | * @count: total number of registers in the bitstream (from frame) | |
61 | * @bit: bit position of 'od' in the returned byte | |
62 | * | |
63 | * returns NULL if 'od' is not in 'data' | |
64 | * | |
65 | * From SFF-8485 v0.7: | |
66 | * "In GPIO_TX[1], bit 0 of byte 3 contains the first bit (i.e., OD0.0) | |
67 | * and bit 7 of byte 0 contains the 32nd bit (i.e., OD10.1). | |
68 | * | |
69 | * In GPIO_TX[2], bit 0 of byte 3 contains the 33rd bit (i.e., OD10.2) | |
70 | * and bit 7 of byte 0 contains the 64th bit (i.e., OD21.0)." | |
71 | * | |
72 | * The general-purpose (raw-bitstream) RX registers have the same layout | |
73 | * although 'od' is renamed 'id' for 'input data'. | |
74 | * | |
75 | * SFF-8489 defines the behavior of the LEDs in response to the 'od' values. | |
76 | */ | |
77 | static u8 *to_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count, u8 *bit) | |
78 | { | |
79 | unsigned int reg; | |
80 | u8 byte; | |
81 | ||
82 | /* gp registers start at index 1 */ | |
83 | if (index == 0) | |
84 | return NULL; | |
85 | ||
86 | index--; /* make index 0-based */ | |
87 | if (od < index * 32) | |
88 | return NULL; | |
89 | ||
90 | od -= index * 32; | |
91 | reg = od >> 5; | |
92 | ||
93 | if (reg >= count) | |
94 | return NULL; | |
95 | ||
96 | od &= (1 << 5) - 1; | |
97 | byte = 3 - (od >> 3); | |
98 | *bit = od & ((1 << 3) - 1); | |
99 | ||
100 | return &data[reg * 4 + byte]; | |
101 | } | |
102 | ||
103 | int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count) | |
104 | { | |
105 | u8 *byte; | |
106 | u8 bit; | |
107 | ||
108 | byte = to_sas_gpio_gp_bit(od, data, index, count, &bit); | |
109 | if (!byte) | |
110 | return -1; | |
111 | ||
112 | return (*byte >> bit) & 1; | |
113 | } | |
114 | EXPORT_SYMBOL(try_test_sas_gpio_gp_bit); | |
115 | ||
116 | static int sas_host_smp_write_gpio(struct sas_ha_struct *sas_ha, u8 *resp_data, | |
117 | u8 reg_type, u8 reg_index, u8 reg_count, | |
118 | u8 *req_data) | |
119 | { | |
120 | struct sas_internal *i = to_sas_internal(sas_ha->core.shost->transportt); | |
121 | int written; | |
122 | ||
123 | if (i->dft->lldd_write_gpio == NULL) { | |
124 | resp_data[2] = SMP_RESP_FUNC_UNK; | |
125 | return 0; | |
126 | } | |
127 | ||
128 | written = i->dft->lldd_write_gpio(sas_ha, reg_type, reg_index, | |
129 | reg_count, req_data); | |
130 | ||
131 | if (written < 0) { | |
132 | resp_data[2] = SMP_RESP_FUNC_FAILED; | |
133 | written = 0; | |
134 | } else | |
135 | resp_data[2] = SMP_RESP_FUNC_ACC; | |
136 | ||
137 | return written; | |
138 | } | |
139 | ||
b98e66fa JB |
140 | static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data, |
141 | u8 phy_id) | |
142 | { | |
143 | struct sas_rphy *rphy; | |
144 | struct dev_to_host_fis *fis; | |
145 | int i; | |
146 | ||
147 | if (phy_id >= sas_ha->num_phys) { | |
148 | resp_data[2] = SMP_RESP_NO_PHY; | |
149 | return; | |
150 | } | |
151 | ||
152 | resp_data[2] = SMP_RESP_PHY_NO_SATA; | |
153 | ||
154 | if (!sas_ha->sas_phy[phy_id]->port) | |
155 | return; | |
156 | ||
157 | rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; | |
158 | fis = (struct dev_to_host_fis *) | |
159 | sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd; | |
160 | if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA) | |
161 | return; | |
162 | ||
163 | resp_data[2] = SMP_RESP_FUNC_ACC; | |
164 | resp_data[9] = phy_id; | |
165 | memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr, | |
166 | SAS_ADDR_SIZE); | |
167 | ||
168 | /* check to see if we have a valid d2h fis */ | |
169 | if (fis->fis_type != 0x34) | |
170 | return; | |
171 | ||
172 | /* the d2h fis is required by the standard to be in LE format */ | |
173 | for (i = 0; i < 20; i += 4) { | |
174 | u8 *dst = resp_data + 24 + i, *src = | |
175 | &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i]; | |
176 | dst[0] = src[3]; | |
177 | dst[1] = src[2]; | |
178 | dst[2] = src[1]; | |
179 | dst[3] = src[0]; | |
180 | } | |
181 | } | |
182 | ||
183 | static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id, | |
184 | u8 phy_op, enum sas_linkrate min, | |
185 | enum sas_linkrate max, u8 *resp_data) | |
186 | { | |
187 | struct sas_internal *i = | |
188 | to_sas_internal(sas_ha->core.shost->transportt); | |
189 | struct sas_phy_linkrates rates; | |
190 | ||
191 | if (phy_id >= sas_ha->num_phys) { | |
192 | resp_data[2] = SMP_RESP_NO_PHY; | |
193 | return; | |
194 | } | |
195 | switch (phy_op) { | |
196 | case PHY_FUNC_NOP: | |
197 | case PHY_FUNC_LINK_RESET: | |
198 | case PHY_FUNC_HARD_RESET: | |
199 | case PHY_FUNC_DISABLE: | |
200 | case PHY_FUNC_CLEAR_ERROR_LOG: | |
201 | case PHY_FUNC_CLEAR_AFFIL: | |
202 | case PHY_FUNC_TX_SATA_PS_SIGNAL: | |
203 | break; | |
204 | ||
205 | default: | |
206 | resp_data[2] = SMP_RESP_PHY_UNK_OP; | |
207 | return; | |
208 | } | |
209 | ||
210 | rates.minimum_linkrate = min; | |
211 | rates.maximum_linkrate = max; | |
212 | ||
213 | if (i->dft->lldd_control_phy(sas_ha->sas_phy[phy_id], phy_op, &rates)) | |
214 | resp_data[2] = SMP_RESP_FUNC_FAILED; | |
215 | else | |
216 | resp_data[2] = SMP_RESP_FUNC_ACC; | |
217 | } | |
218 | ||
219 | int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req, | |
220 | struct request *rsp) | |
221 | { | |
222 | u8 *req_data = NULL, *resp_data = NULL, *buf; | |
223 | struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); | |
c3a4d78c | 224 | int error = -EINVAL; |
b98e66fa JB |
225 | |
226 | /* eight is the minimum size for request and response frames */ | |
b0790410 | 227 | if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8) |
b98e66fa JB |
228 | goto out; |
229 | ||
b0790410 TH |
230 | if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE || |
231 | bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) { | |
b98e66fa JB |
232 | shost_printk(KERN_ERR, shost, |
233 | "SMP request/response frame crosses page boundary"); | |
234 | goto out; | |
235 | } | |
236 | ||
b0790410 | 237 | req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL); |
b98e66fa JB |
238 | |
239 | /* make sure frame can always be built ... we copy | |
240 | * back only the requested length */ | |
b0790410 | 241 | resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL); |
b98e66fa JB |
242 | |
243 | if (!req_data || !resp_data) { | |
244 | error = -ENOMEM; | |
245 | goto out; | |
246 | } | |
247 | ||
248 | local_irq_disable(); | |
77dfce07 | 249 | buf = kmap_atomic(bio_page(req->bio)); |
b0790410 | 250 | memcpy(req_data, buf, blk_rq_bytes(req)); |
77dfce07 | 251 | kunmap_atomic(buf - bio_offset(req->bio)); |
b98e66fa JB |
252 | local_irq_enable(); |
253 | ||
254 | if (req_data[0] != SMP_REQUEST) | |
255 | goto out; | |
256 | ||
257 | /* always succeeds ... even if we can't process the request | |
258 | * the result is in the response frame */ | |
259 | error = 0; | |
260 | ||
261 | /* set up default don't know response */ | |
262 | resp_data[0] = SMP_RESPONSE; | |
263 | resp_data[1] = req_data[1]; | |
264 | resp_data[2] = SMP_RESP_FUNC_UNK; | |
265 | ||
266 | switch (req_data[1]) { | |
267 | case SMP_REPORT_GENERAL: | |
c3a4d78c TH |
268 | req->resid_len -= 8; |
269 | rsp->resid_len -= 32; | |
b98e66fa JB |
270 | resp_data[2] = SMP_RESP_FUNC_ACC; |
271 | resp_data[9] = sas_ha->num_phys; | |
272 | break; | |
273 | ||
274 | case SMP_REPORT_MANUF_INFO: | |
c3a4d78c TH |
275 | req->resid_len -= 8; |
276 | rsp->resid_len -= 64; | |
b98e66fa JB |
277 | resp_data[2] = SMP_RESP_FUNC_ACC; |
278 | memcpy(resp_data + 12, shost->hostt->name, | |
279 | SAS_EXPANDER_VENDOR_ID_LEN); | |
280 | memcpy(resp_data + 20, "libsas virt phy", | |
281 | SAS_EXPANDER_PRODUCT_ID_LEN); | |
282 | break; | |
283 | ||
284 | case SMP_READ_GPIO_REG: | |
285 | /* FIXME: need GPIO support in the transport class */ | |
286 | break; | |
287 | ||
288 | case SMP_DISCOVER: | |
c3a4d78c TH |
289 | req->resid_len -= 16; |
290 | if ((int)req->resid_len < 0) { | |
291 | req->resid_len = 0; | |
b98e66fa JB |
292 | error = -EINVAL; |
293 | goto out; | |
294 | } | |
c3a4d78c | 295 | rsp->resid_len -= 56; |
b98e66fa JB |
296 | sas_host_smp_discover(sas_ha, resp_data, req_data[9]); |
297 | break; | |
298 | ||
299 | case SMP_REPORT_PHY_ERR_LOG: | |
300 | /* FIXME: could implement this with additional | |
301 | * libsas callbacks providing the HW supports it */ | |
302 | break; | |
303 | ||
304 | case SMP_REPORT_PHY_SATA: | |
c3a4d78c TH |
305 | req->resid_len -= 16; |
306 | if ((int)req->resid_len < 0) { | |
307 | req->resid_len = 0; | |
b98e66fa JB |
308 | error = -EINVAL; |
309 | goto out; | |
310 | } | |
c3a4d78c | 311 | rsp->resid_len -= 60; |
b98e66fa JB |
312 | sas_report_phy_sata(sas_ha, resp_data, req_data[9]); |
313 | break; | |
314 | ||
315 | case SMP_REPORT_ROUTE_INFO: | |
316 | /* Can't implement; hosts have no routes */ | |
317 | break; | |
318 | ||
8ec6552f DW |
319 | case SMP_WRITE_GPIO_REG: { |
320 | /* SFF-8485 v0.7 */ | |
321 | const int base_frame_size = 11; | |
322 | int to_write = req_data[4]; | |
323 | ||
324 | if (blk_rq_bytes(req) < base_frame_size + to_write * 4 || | |
325 | req->resid_len < base_frame_size + to_write * 4) { | |
326 | resp_data[2] = SMP_RESP_INV_FRM_LEN; | |
327 | break; | |
328 | } | |
329 | ||
330 | to_write = sas_host_smp_write_gpio(sas_ha, resp_data, req_data[2], | |
331 | req_data[3], to_write, &req_data[8]); | |
332 | req->resid_len -= base_frame_size + to_write * 4; | |
333 | rsp->resid_len -= 8; | |
b98e66fa | 334 | break; |
8ec6552f | 335 | } |
b98e66fa JB |
336 | |
337 | case SMP_CONF_ROUTE_INFO: | |
338 | /* Can't implement; hosts have no routes */ | |
339 | break; | |
340 | ||
341 | case SMP_PHY_CONTROL: | |
c3a4d78c TH |
342 | req->resid_len -= 44; |
343 | if ((int)req->resid_len < 0) { | |
344 | req->resid_len = 0; | |
b98e66fa JB |
345 | error = -EINVAL; |
346 | goto out; | |
347 | } | |
c3a4d78c | 348 | rsp->resid_len -= 8; |
b98e66fa JB |
349 | sas_phy_control(sas_ha, req_data[9], req_data[10], |
350 | req_data[32] >> 4, req_data[33] >> 4, | |
351 | resp_data); | |
352 | break; | |
353 | ||
354 | case SMP_PHY_TEST_FUNCTION: | |
355 | /* FIXME: should this be implemented? */ | |
356 | break; | |
357 | ||
358 | default: | |
359 | /* probably a 2.0 function */ | |
360 | break; | |
361 | } | |
362 | ||
363 | local_irq_disable(); | |
77dfce07 | 364 | buf = kmap_atomic(bio_page(rsp->bio)); |
b0790410 | 365 | memcpy(buf, resp_data, blk_rq_bytes(rsp)); |
b98e66fa | 366 | flush_kernel_dcache_page(bio_page(rsp->bio)); |
77dfce07 | 367 | kunmap_atomic(buf - bio_offset(rsp->bio)); |
b98e66fa | 368 | local_irq_enable(); |
b98e66fa JB |
369 | |
370 | out: | |
371 | kfree(req_data); | |
372 | kfree(resp_data); | |
373 | return error; | |
374 | } |