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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> | |
13 | ||
14 | #include "sas_internal.h" | |
15 | ||
16 | #include <scsi/scsi_transport.h> | |
17 | #include <scsi/scsi_transport_sas.h> | |
18 | #include "../scsi_sas_internal.h" | |
19 | ||
20 | static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data, | |
21 | u8 phy_id) | |
22 | { | |
23 | struct sas_phy *phy; | |
24 | struct sas_rphy *rphy; | |
25 | ||
26 | if (phy_id >= sas_ha->num_phys) { | |
27 | resp_data[2] = SMP_RESP_NO_PHY; | |
28 | return; | |
29 | } | |
30 | resp_data[2] = SMP_RESP_FUNC_ACC; | |
31 | ||
32 | phy = sas_ha->sas_phy[phy_id]->phy; | |
33 | resp_data[9] = phy_id; | |
34 | resp_data[13] = phy->negotiated_linkrate; | |
35 | memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE); | |
36 | memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr, | |
37 | SAS_ADDR_SIZE); | |
38 | resp_data[40] = (phy->minimum_linkrate << 4) | | |
39 | phy->minimum_linkrate_hw; | |
40 | resp_data[41] = (phy->maximum_linkrate << 4) | | |
41 | phy->maximum_linkrate_hw; | |
42 | ||
43 | if (!sas_ha->sas_phy[phy_id]->port || | |
44 | !sas_ha->sas_phy[phy_id]->port->port_dev) | |
45 | return; | |
46 | ||
47 | rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; | |
48 | resp_data[12] = rphy->identify.device_type << 4; | |
49 | resp_data[14] = rphy->identify.initiator_port_protocols; | |
50 | resp_data[15] = rphy->identify.target_port_protocols; | |
51 | } | |
52 | ||
53 | static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data, | |
54 | u8 phy_id) | |
55 | { | |
56 | struct sas_rphy *rphy; | |
57 | struct dev_to_host_fis *fis; | |
58 | int i; | |
59 | ||
60 | if (phy_id >= sas_ha->num_phys) { | |
61 | resp_data[2] = SMP_RESP_NO_PHY; | |
62 | return; | |
63 | } | |
64 | ||
65 | resp_data[2] = SMP_RESP_PHY_NO_SATA; | |
66 | ||
67 | if (!sas_ha->sas_phy[phy_id]->port) | |
68 | return; | |
69 | ||
70 | rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy; | |
71 | fis = (struct dev_to_host_fis *) | |
72 | sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd; | |
73 | if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA) | |
74 | return; | |
75 | ||
76 | resp_data[2] = SMP_RESP_FUNC_ACC; | |
77 | resp_data[9] = phy_id; | |
78 | memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr, | |
79 | SAS_ADDR_SIZE); | |
80 | ||
81 | /* check to see if we have a valid d2h fis */ | |
82 | if (fis->fis_type != 0x34) | |
83 | return; | |
84 | ||
85 | /* the d2h fis is required by the standard to be in LE format */ | |
86 | for (i = 0; i < 20; i += 4) { | |
87 | u8 *dst = resp_data + 24 + i, *src = | |
88 | &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i]; | |
89 | dst[0] = src[3]; | |
90 | dst[1] = src[2]; | |
91 | dst[2] = src[1]; | |
92 | dst[3] = src[0]; | |
93 | } | |
94 | } | |
95 | ||
96 | static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id, | |
97 | u8 phy_op, enum sas_linkrate min, | |
98 | enum sas_linkrate max, u8 *resp_data) | |
99 | { | |
100 | struct sas_internal *i = | |
101 | to_sas_internal(sas_ha->core.shost->transportt); | |
102 | struct sas_phy_linkrates rates; | |
103 | ||
104 | if (phy_id >= sas_ha->num_phys) { | |
105 | resp_data[2] = SMP_RESP_NO_PHY; | |
106 | return; | |
107 | } | |
108 | switch (phy_op) { | |
109 | case PHY_FUNC_NOP: | |
110 | case PHY_FUNC_LINK_RESET: | |
111 | case PHY_FUNC_HARD_RESET: | |
112 | case PHY_FUNC_DISABLE: | |
113 | case PHY_FUNC_CLEAR_ERROR_LOG: | |
114 | case PHY_FUNC_CLEAR_AFFIL: | |
115 | case PHY_FUNC_TX_SATA_PS_SIGNAL: | |
116 | break; | |
117 | ||
118 | default: | |
119 | resp_data[2] = SMP_RESP_PHY_UNK_OP; | |
120 | return; | |
121 | } | |
122 | ||
123 | rates.minimum_linkrate = min; | |
124 | rates.maximum_linkrate = max; | |
125 | ||
126 | if (i->dft->lldd_control_phy(sas_ha->sas_phy[phy_id], phy_op, &rates)) | |
127 | resp_data[2] = SMP_RESP_FUNC_FAILED; | |
128 | else | |
129 | resp_data[2] = SMP_RESP_FUNC_ACC; | |
130 | } | |
131 | ||
132 | int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req, | |
133 | struct request *rsp) | |
134 | { | |
135 | u8 *req_data = NULL, *resp_data = NULL, *buf; | |
136 | struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); | |
c3a4d78c | 137 | int error = -EINVAL; |
b98e66fa JB |
138 | |
139 | /* eight is the minimum size for request and response frames */ | |
b0790410 | 140 | if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8) |
b98e66fa JB |
141 | goto out; |
142 | ||
b0790410 TH |
143 | if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE || |
144 | bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) { | |
b98e66fa JB |
145 | shost_printk(KERN_ERR, shost, |
146 | "SMP request/response frame crosses page boundary"); | |
147 | goto out; | |
148 | } | |
149 | ||
b0790410 | 150 | req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL); |
b98e66fa JB |
151 | |
152 | /* make sure frame can always be built ... we copy | |
153 | * back only the requested length */ | |
b0790410 | 154 | resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL); |
b98e66fa JB |
155 | |
156 | if (!req_data || !resp_data) { | |
157 | error = -ENOMEM; | |
158 | goto out; | |
159 | } | |
160 | ||
161 | local_irq_disable(); | |
162 | buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio); | |
b0790410 | 163 | memcpy(req_data, buf, blk_rq_bytes(req)); |
b98e66fa JB |
164 | kunmap_atomic(buf - bio_offset(req->bio), KM_USER0); |
165 | local_irq_enable(); | |
166 | ||
167 | if (req_data[0] != SMP_REQUEST) | |
168 | goto out; | |
169 | ||
170 | /* always succeeds ... even if we can't process the request | |
171 | * the result is in the response frame */ | |
172 | error = 0; | |
173 | ||
174 | /* set up default don't know response */ | |
175 | resp_data[0] = SMP_RESPONSE; | |
176 | resp_data[1] = req_data[1]; | |
177 | resp_data[2] = SMP_RESP_FUNC_UNK; | |
178 | ||
179 | switch (req_data[1]) { | |
180 | case SMP_REPORT_GENERAL: | |
c3a4d78c TH |
181 | req->resid_len -= 8; |
182 | rsp->resid_len -= 32; | |
b98e66fa JB |
183 | resp_data[2] = SMP_RESP_FUNC_ACC; |
184 | resp_data[9] = sas_ha->num_phys; | |
185 | break; | |
186 | ||
187 | case SMP_REPORT_MANUF_INFO: | |
c3a4d78c TH |
188 | req->resid_len -= 8; |
189 | rsp->resid_len -= 64; | |
b98e66fa JB |
190 | resp_data[2] = SMP_RESP_FUNC_ACC; |
191 | memcpy(resp_data + 12, shost->hostt->name, | |
192 | SAS_EXPANDER_VENDOR_ID_LEN); | |
193 | memcpy(resp_data + 20, "libsas virt phy", | |
194 | SAS_EXPANDER_PRODUCT_ID_LEN); | |
195 | break; | |
196 | ||
197 | case SMP_READ_GPIO_REG: | |
198 | /* FIXME: need GPIO support in the transport class */ | |
199 | break; | |
200 | ||
201 | case SMP_DISCOVER: | |
c3a4d78c TH |
202 | req->resid_len -= 16; |
203 | if ((int)req->resid_len < 0) { | |
204 | req->resid_len = 0; | |
b98e66fa JB |
205 | error = -EINVAL; |
206 | goto out; | |
207 | } | |
c3a4d78c | 208 | rsp->resid_len -= 56; |
b98e66fa JB |
209 | sas_host_smp_discover(sas_ha, resp_data, req_data[9]); |
210 | break; | |
211 | ||
212 | case SMP_REPORT_PHY_ERR_LOG: | |
213 | /* FIXME: could implement this with additional | |
214 | * libsas callbacks providing the HW supports it */ | |
215 | break; | |
216 | ||
217 | case SMP_REPORT_PHY_SATA: | |
c3a4d78c TH |
218 | req->resid_len -= 16; |
219 | if ((int)req->resid_len < 0) { | |
220 | req->resid_len = 0; | |
b98e66fa JB |
221 | error = -EINVAL; |
222 | goto out; | |
223 | } | |
c3a4d78c | 224 | rsp->resid_len -= 60; |
b98e66fa JB |
225 | sas_report_phy_sata(sas_ha, resp_data, req_data[9]); |
226 | break; | |
227 | ||
228 | case SMP_REPORT_ROUTE_INFO: | |
229 | /* Can't implement; hosts have no routes */ | |
230 | break; | |
231 | ||
232 | case SMP_WRITE_GPIO_REG: | |
233 | /* FIXME: need GPIO support in the transport class */ | |
234 | break; | |
235 | ||
236 | case SMP_CONF_ROUTE_INFO: | |
237 | /* Can't implement; hosts have no routes */ | |
238 | break; | |
239 | ||
240 | case SMP_PHY_CONTROL: | |
c3a4d78c TH |
241 | req->resid_len -= 44; |
242 | if ((int)req->resid_len < 0) { | |
243 | req->resid_len = 0; | |
b98e66fa JB |
244 | error = -EINVAL; |
245 | goto out; | |
246 | } | |
c3a4d78c | 247 | rsp->resid_len -= 8; |
b98e66fa JB |
248 | sas_phy_control(sas_ha, req_data[9], req_data[10], |
249 | req_data[32] >> 4, req_data[33] >> 4, | |
250 | resp_data); | |
251 | break; | |
252 | ||
253 | case SMP_PHY_TEST_FUNCTION: | |
254 | /* FIXME: should this be implemented? */ | |
255 | break; | |
256 | ||
257 | default: | |
258 | /* probably a 2.0 function */ | |
259 | break; | |
260 | } | |
261 | ||
262 | local_irq_disable(); | |
263 | buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio); | |
b0790410 | 264 | memcpy(buf, resp_data, blk_rq_bytes(rsp)); |
b98e66fa JB |
265 | flush_kernel_dcache_page(bio_page(rsp->bio)); |
266 | kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0); | |
267 | local_irq_enable(); | |
b98e66fa JB |
268 | |
269 | out: | |
270 | kfree(req_data); | |
271 | kfree(resp_data); | |
272 | return error; | |
273 | } |