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);