Add linux-next specific files for 20110831
[linux-2.6/next.git] / drivers / scsi / libsas / sas_host_smp.c
blob04ad8dd1a74cf8267982e29a551efd1503a5ef1c
1 /*
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,
22 u8 phy_id)
24 struct sas_phy *phy;
25 struct sas_rphy *rphy;
27 if (phy_id >= sas_ha->num_phys) {
28 resp_data[2] = SMP_RESP_NO_PHY;
29 return;
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,
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;
44 if (!sas_ha->sas_phy[phy_id]->port ||
45 !sas_ha->sas_phy[phy_id]->port->port_dev)
46 return;
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;
54 static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data,
55 u8 phy_id)
57 struct sas_rphy *rphy;
58 struct dev_to_host_fis *fis;
59 int i;
61 if (phy_id >= sas_ha->num_phys) {
62 resp_data[2] = SMP_RESP_NO_PHY;
63 return;
66 resp_data[2] = SMP_RESP_PHY_NO_SATA;
68 if (!sas_ha->sas_phy[phy_id]->port)
69 return;
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;
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);
82 /* check to see if we have a valid d2h fis */
83 if (fis->fis_type != 0x34)
84 return;
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];
97 static 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)
101 struct sas_internal *i =
102 to_sas_internal(sas_ha->core.shost->transportt);
103 struct sas_phy_linkrates rates;
105 if (phy_id >= sas_ha->num_phys) {
106 resp_data[2] = SMP_RESP_NO_PHY;
107 return;
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;
119 default:
120 resp_data[2] = SMP_RESP_PHY_UNK_OP;
121 return;
124 rates.minimum_linkrate = min;
125 rates.maximum_linkrate = max;
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;
133 int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
134 struct request *rsp)
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;
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;
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;
151 req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
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);
157 if (!req_data || !resp_data) {
158 error = -ENOMEM;
159 goto out;
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();
168 if (req_data[0] != SMP_REQUEST)
169 goto out;
171 /* always succeeds ... even if we can't process the request
172 * the result is in the response frame */
173 error = 0;
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;
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;
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;
198 case SMP_READ_GPIO_REG:
199 /* FIXME: need GPIO support in the transport class */
200 break;
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;
209 rsp->resid_len -= 56;
210 sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
211 break;
213 case SMP_REPORT_PHY_ERR_LOG:
214 /* FIXME: could implement this with additional
215 * libsas callbacks providing the HW supports it */
216 break;
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;
225 rsp->resid_len -= 60;
226 sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
227 break;
229 case SMP_REPORT_ROUTE_INFO:
230 /* Can't implement; hosts have no routes */
231 break;
233 case SMP_WRITE_GPIO_REG:
234 /* FIXME: need GPIO support in the transport class */
235 break;
237 case SMP_CONF_ROUTE_INFO:
238 /* Can't implement; hosts have no routes */
239 break;
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;
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;
254 case SMP_PHY_TEST_FUNCTION:
255 /* FIXME: should this be implemented? */
256 break;
258 default:
259 /* probably a 2.0 function */
260 break;
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();
270 out:
271 kfree(req_data);
272 kfree(resp_data);
273 return error;