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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>
13#include <linux/slab.h>
14
15#include "sas_internal.h"
16
17#include <scsi/scsi_transport.h>
18#include <scsi/scsi_transport_sas.h>
19#include "../scsi_sas_internal.h"
20
21static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data,
22 u8 phy_id)
23{
24 struct sas_phy *phy;
25 struct sas_rphy *rphy;
26
27 if (phy_id >= sas_ha->num_phys) {
28 resp_data[2] = SMP_RESP_NO_PHY;
29 return;
30 }
31 resp_data[2] = SMP_RESP_FUNC_ACC;
32
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,
38 SAS_ADDR_SIZE);
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;
43
44 if (!sas_ha->sas_phy[phy_id]->port ||
45 !sas_ha->sas_phy[phy_id]->port->port_dev)
46 return;
47
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;
52}
53
54static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data,
55 u8 phy_id)
56{
57 struct sas_rphy *rphy;
58 struct dev_to_host_fis *fis;
59 int i;
60
61 if (phy_id >= sas_ha->num_phys) {
62 resp_data[2] = SMP_RESP_NO_PHY;
63 return;
64 }
65
66 resp_data[2] = SMP_RESP_PHY_NO_SATA;
67
68 if (!sas_ha->sas_phy[phy_id]->port)
69 return;
70
71 rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
72 fis = (struct dev_to_host_fis *)
73 sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd;
74 if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA)
75 return;
76
77 resp_data[2] = SMP_RESP_FUNC_ACC;
78 resp_data[9] = phy_id;
79 memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr,
80 SAS_ADDR_SIZE);
81
82 /* check to see if we have a valid d2h fis */
83 if (fis->fis_type != 0x34)
84 return;
85
86 /* the d2h fis is required by the standard to be in LE format */
87 for (i = 0; i < 20; i += 4) {
88 u8 *dst = resp_data + 24 + i, *src =
89 &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i];
90 dst[0] = src[3];
91 dst[1] = src[2];
92 dst[2] = src[1];
93 dst[3] = src[0];
94 }
95}
96
97static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id,
98 u8 phy_op, enum sas_linkrate min,
99 enum sas_linkrate max, u8 *resp_data)
100{
101 struct sas_internal *i =
102 to_sas_internal(sas_ha->core.shost->transportt);
103 struct sas_phy_linkrates rates;
104
105 if (phy_id >= sas_ha->num_phys) {
106 resp_data[2] = SMP_RESP_NO_PHY;
107 return;
108 }
109 switch (phy_op) {
110 case PHY_FUNC_NOP:
111 case PHY_FUNC_LINK_RESET:
112 case PHY_FUNC_HARD_RESET:
113 case PHY_FUNC_DISABLE:
114 case PHY_FUNC_CLEAR_ERROR_LOG:
115 case PHY_FUNC_CLEAR_AFFIL:
116 case PHY_FUNC_TX_SATA_PS_SIGNAL:
117 break;
118
119 default:
120 resp_data[2] = SMP_RESP_PHY_UNK_OP;
121 return;
122 }
123
124 rates.minimum_linkrate = min;
125 rates.maximum_linkrate = max;
126
127 if (i->dft->lldd_control_phy(sas_ha->sas_phy[phy_id], phy_op, &rates))
128 resp_data[2] = SMP_RESP_FUNC_FAILED;
129 else
130 resp_data[2] = SMP_RESP_FUNC_ACC;
131}
132
133int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
134 struct request *rsp)
135{
136 u8 *req_data = NULL, *resp_data = NULL, *buf;
137 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
138 int error = -EINVAL;
139
140 /* eight is the minimum size for request and response frames */
141 if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
142 goto out;
143
144 if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
145 bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
146 shost_printk(KERN_ERR, shost,
147 "SMP request/response frame crosses page boundary");
148 goto out;
149 }
150
151 req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
152
153 /* make sure frame can always be built ... we copy
154 * back only the requested length */
155 resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
156
157 if (!req_data || !resp_data) {
158 error = -ENOMEM;
159 goto out;
160 }
161
162 local_irq_disable();
163 buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
164 memcpy(req_data, buf, blk_rq_bytes(req));
165 kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
166 local_irq_enable();
167
168 if (req_data[0] != SMP_REQUEST)
169 goto out;
170
171 /* always succeeds ... even if we can't process the request
172 * the result is in the response frame */
173 error = 0;
174
175 /* set up default don't know response */
176 resp_data[0] = SMP_RESPONSE;
177 resp_data[1] = req_data[1];
178 resp_data[2] = SMP_RESP_FUNC_UNK;
179
180 switch (req_data[1]) {
181 case SMP_REPORT_GENERAL:
182 req->resid_len -= 8;
183 rsp->resid_len -= 32;
184 resp_data[2] = SMP_RESP_FUNC_ACC;
185 resp_data[9] = sas_ha->num_phys;
186 break;
187
188 case SMP_REPORT_MANUF_INFO:
189 req->resid_len -= 8;
190 rsp->resid_len -= 64;
191 resp_data[2] = SMP_RESP_FUNC_ACC;
192 memcpy(resp_data + 12, shost->hostt->name,
193 SAS_EXPANDER_VENDOR_ID_LEN);
194 memcpy(resp_data + 20, "libsas virt phy",
195 SAS_EXPANDER_PRODUCT_ID_LEN);
196 break;
197
198 case SMP_READ_GPIO_REG:
199 /* FIXME: need GPIO support in the transport class */
200 break;
201
202 case SMP_DISCOVER:
203 req->resid_len -= 16;
204 if ((int)req->resid_len < 0) {
205 req->resid_len = 0;
206 error = -EINVAL;
207 goto out;
208 }
209 rsp->resid_len -= 56;
210 sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
211 break;
212
213 case SMP_REPORT_PHY_ERR_LOG:
214 /* FIXME: could implement this with additional
215 * libsas callbacks providing the HW supports it */
216 break;
217
218 case SMP_REPORT_PHY_SATA:
219 req->resid_len -= 16;
220 if ((int)req->resid_len < 0) {
221 req->resid_len = 0;
222 error = -EINVAL;
223 goto out;
224 }
225 rsp->resid_len -= 60;
226 sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
227 break;
228
229 case SMP_REPORT_ROUTE_INFO:
230 /* Can't implement; hosts have no routes */
231 break;
232
233 case SMP_WRITE_GPIO_REG:
234 /* FIXME: need GPIO support in the transport class */
235 break;
236
237 case SMP_CONF_ROUTE_INFO:
238 /* Can't implement; hosts have no routes */
239 break;
240
241 case SMP_PHY_CONTROL:
242 req->resid_len -= 44;
243 if ((int)req->resid_len < 0) {
244 req->resid_len = 0;
245 error = -EINVAL;
246 goto out;
247 }
248 rsp->resid_len -= 8;
249 sas_phy_control(sas_ha, req_data[9], req_data[10],
250 req_data[32] >> 4, req_data[33] >> 4,
251 resp_data);
252 break;
253
254 case SMP_PHY_TEST_FUNCTION:
255 /* FIXME: should this be implemented? */
256 break;
257
258 default:
259 /* probably a 2.0 function */
260 break;
261 }
262
263 local_irq_disable();
264 buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
265 memcpy(buf, resp_data, blk_rq_bytes(rsp));
266 flush_kernel_dcache_page(bio_page(rsp->bio));
267 kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
268 local_irq_enable();
269
270 out:
271 kfree(req_data);
272 kfree(resp_data);
273 return error;
274}
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>
13#include <linux/slab.h>
14#include <linux/export.h>
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
22static 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
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 */
77static 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
103int 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}
114EXPORT_SYMBOL(try_test_sas_gpio_gp_bit);
115
116static 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
140static 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
183static 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 struct asd_sas_phy *asd_phy;
191
192 if (phy_id >= sas_ha->num_phys) {
193 resp_data[2] = SMP_RESP_NO_PHY;
194 return;
195 }
196
197 asd_phy = sas_ha->sas_phy[phy_id];
198 switch (phy_op) {
199 case PHY_FUNC_NOP:
200 case PHY_FUNC_LINK_RESET:
201 case PHY_FUNC_HARD_RESET:
202 case PHY_FUNC_DISABLE:
203 case PHY_FUNC_CLEAR_ERROR_LOG:
204 case PHY_FUNC_CLEAR_AFFIL:
205 case PHY_FUNC_TX_SATA_PS_SIGNAL:
206 break;
207
208 default:
209 resp_data[2] = SMP_RESP_PHY_UNK_OP;
210 return;
211 }
212
213 rates.minimum_linkrate = min;
214 rates.maximum_linkrate = max;
215
216 /* filter reset requests through libata eh */
217 if (phy_op == PHY_FUNC_LINK_RESET && sas_try_ata_reset(asd_phy) == 0) {
218 resp_data[2] = SMP_RESP_FUNC_ACC;
219 return;
220 }
221
222 if (i->dft->lldd_control_phy(asd_phy, phy_op, &rates))
223 resp_data[2] = SMP_RESP_FUNC_FAILED;
224 else
225 resp_data[2] = SMP_RESP_FUNC_ACC;
226}
227
228int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
229 struct request *rsp)
230{
231 u8 *req_data = NULL, *resp_data = NULL, *buf;
232 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
233 int error = -EINVAL;
234
235 /* eight is the minimum size for request and response frames */
236 if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
237 goto out;
238
239 if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
240 bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
241 shost_printk(KERN_ERR, shost,
242 "SMP request/response frame crosses page boundary");
243 goto out;
244 }
245
246 req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
247
248 /* make sure frame can always be built ... we copy
249 * back only the requested length */
250 resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
251
252 if (!req_data || !resp_data) {
253 error = -ENOMEM;
254 goto out;
255 }
256
257 local_irq_disable();
258 buf = kmap_atomic(bio_page(req->bio));
259 memcpy(req_data, buf, blk_rq_bytes(req));
260 kunmap_atomic(buf - bio_offset(req->bio));
261 local_irq_enable();
262
263 if (req_data[0] != SMP_REQUEST)
264 goto out;
265
266 /* always succeeds ... even if we can't process the request
267 * the result is in the response frame */
268 error = 0;
269
270 /* set up default don't know response */
271 resp_data[0] = SMP_RESPONSE;
272 resp_data[1] = req_data[1];
273 resp_data[2] = SMP_RESP_FUNC_UNK;
274
275 switch (req_data[1]) {
276 case SMP_REPORT_GENERAL:
277 req->resid_len -= 8;
278 rsp->resid_len -= 32;
279 resp_data[2] = SMP_RESP_FUNC_ACC;
280 resp_data[9] = sas_ha->num_phys;
281 break;
282
283 case SMP_REPORT_MANUF_INFO:
284 req->resid_len -= 8;
285 rsp->resid_len -= 64;
286 resp_data[2] = SMP_RESP_FUNC_ACC;
287 memcpy(resp_data + 12, shost->hostt->name,
288 SAS_EXPANDER_VENDOR_ID_LEN);
289 memcpy(resp_data + 20, "libsas virt phy",
290 SAS_EXPANDER_PRODUCT_ID_LEN);
291 break;
292
293 case SMP_READ_GPIO_REG:
294 /* FIXME: need GPIO support in the transport class */
295 break;
296
297 case SMP_DISCOVER:
298 req->resid_len -= 16;
299 if ((int)req->resid_len < 0) {
300 req->resid_len = 0;
301 error = -EINVAL;
302 goto out;
303 }
304 rsp->resid_len -= 56;
305 sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
306 break;
307
308 case SMP_REPORT_PHY_ERR_LOG:
309 /* FIXME: could implement this with additional
310 * libsas callbacks providing the HW supports it */
311 break;
312
313 case SMP_REPORT_PHY_SATA:
314 req->resid_len -= 16;
315 if ((int)req->resid_len < 0) {
316 req->resid_len = 0;
317 error = -EINVAL;
318 goto out;
319 }
320 rsp->resid_len -= 60;
321 sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
322 break;
323
324 case SMP_REPORT_ROUTE_INFO:
325 /* Can't implement; hosts have no routes */
326 break;
327
328 case SMP_WRITE_GPIO_REG: {
329 /* SFF-8485 v0.7 */
330 const int base_frame_size = 11;
331 int to_write = req_data[4];
332
333 if (blk_rq_bytes(req) < base_frame_size + to_write * 4 ||
334 req->resid_len < base_frame_size + to_write * 4) {
335 resp_data[2] = SMP_RESP_INV_FRM_LEN;
336 break;
337 }
338
339 to_write = sas_host_smp_write_gpio(sas_ha, resp_data, req_data[2],
340 req_data[3], to_write, &req_data[8]);
341 req->resid_len -= base_frame_size + to_write * 4;
342 rsp->resid_len -= 8;
343 break;
344 }
345
346 case SMP_CONF_ROUTE_INFO:
347 /* Can't implement; hosts have no routes */
348 break;
349
350 case SMP_PHY_CONTROL:
351 req->resid_len -= 44;
352 if ((int)req->resid_len < 0) {
353 req->resid_len = 0;
354 error = -EINVAL;
355 goto out;
356 }
357 rsp->resid_len -= 8;
358 sas_phy_control(sas_ha, req_data[9], req_data[10],
359 req_data[32] >> 4, req_data[33] >> 4,
360 resp_data);
361 break;
362
363 case SMP_PHY_TEST_FUNCTION:
364 /* FIXME: should this be implemented? */
365 break;
366
367 default:
368 /* probably a 2.0 function */
369 break;
370 }
371
372 local_irq_disable();
373 buf = kmap_atomic(bio_page(rsp->bio));
374 memcpy(buf, resp_data, blk_rq_bytes(rsp));
375 flush_kernel_dcache_page(bio_page(rsp->bio));
376 kunmap_atomic(buf - bio_offset(rsp->bio));
377 local_irq_enable();
378
379 out:
380 kfree(req_data);
381 kfree(resp_data);
382 return error;
383}