[mirror_ubuntu-artful-kernel.git] / drivers / scsi / libsas / sas_host_smp.c

/*
 * Serial Attached SCSI (SAS) Expander discovery and configuration
 *
 * Copyright (C) 2007 James E.J. Bottomley
 *		<James.Bottomley@HansenPartnership.com>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; version 2 only.
 */
#include <linux/scatterlist.h>
#include <linux/blkdev.h>
#include <linux/slab.h>

#include "sas_internal.h"

#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_sas.h>
#include "../scsi_sas_internal.h"

static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data,
				  u8 phy_id)
{
	struct sas_phy *phy;
	struct sas_rphy *rphy;

	if (phy_id >= sas_ha->num_phys) {
		resp_data[2] = SMP_RESP_NO_PHY;
		return;
	}
	resp_data[2] = SMP_RESP_FUNC_ACC;

	phy = sas_ha->sas_phy[phy_id]->phy;
	resp_data[9] = phy_id;
	resp_data[13] = phy->negotiated_linkrate;
	memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE);
	memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr,
	       SAS_ADDR_SIZE);
	resp_data[40] = (phy->minimum_linkrate << 4) |
		phy->minimum_linkrate_hw;
	resp_data[41] = (phy->maximum_linkrate << 4) |
		phy->maximum_linkrate_hw;

	if (!sas_ha->sas_phy[phy_id]->port ||
	    !sas_ha->sas_phy[phy_id]->port->port_dev)
		return;

	rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
	resp_data[12] = rphy->identify.device_type << 4;
	resp_data[14] = rphy->identify.initiator_port_protocols;
	resp_data[15] = rphy->identify.target_port_protocols;
}

/**
 * to_sas_gpio_gp_bit - given the gpio frame data find the byte/bit position of 'od'
 * @od: od bit to find
 * @data: incoming bitstream (from frame)
 * @index: requested data register index (from frame)
 * @count: total number of registers in the bitstream (from frame)
 * @bit: bit position of 'od' in the returned byte
 *
 * returns NULL if 'od' is not in 'data'
 *
 * From SFF-8485 v0.7:
 * "In GPIO_TX[1], bit 0 of byte 3 contains the first bit (i.e., OD0.0)
 *  and bit 7 of byte 0 contains the 32nd bit (i.e., OD10.1).
 *
 *  In GPIO_TX[2], bit 0 of byte 3 contains the 33rd bit (i.e., OD10.2)
 *  and bit 7 of byte 0 contains the 64th bit (i.e., OD21.0)."
 *
 * The general-purpose (raw-bitstream) RX registers have the same layout
 * although 'od' is renamed 'id' for 'input data'.
 *
 * SFF-8489 defines the behavior of the LEDs in response to the 'od' values.
 */
static u8 *to_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count, u8 *bit)
{
	unsigned int reg;
	u8 byte;

	/* gp registers start at index 1 */
	if (index == 0)
		return NULL;

	index--; /* make index 0-based */
	if (od < index * 32)
		return NULL;

	od -= index * 32;
	reg = od >> 5;

	if (reg >= count)
		return NULL;

	od &= (1 << 5) - 1;
	byte = 3 - (od >> 3);
	*bit = od & ((1 << 3) - 1);

	return &data[reg * 4 + byte];
}

int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count)
{
	u8 *byte;
	u8 bit;

	byte = to_sas_gpio_gp_bit(od, data, index, count, &bit);
	if (!byte)
		return -1;

	return (*byte >> bit) & 1;
}
EXPORT_SYMBOL(try_test_sas_gpio_gp_bit);

static int sas_host_smp_write_gpio(struct sas_ha_struct *sas_ha, u8 *resp_data,
				   u8 reg_type, u8 reg_index, u8 reg_count,
				   u8 *req_data)
{
	struct sas_internal *i = to_sas_internal(sas_ha->core.shost->transportt);
	int written;

	if (i->dft->lldd_write_gpio == NULL) {
		resp_data[2] = SMP_RESP_FUNC_UNK;
		return 0;
	}

	written = i->dft->lldd_write_gpio(sas_ha, reg_type, reg_index,
					  reg_count, req_data);

	if (written < 0) {
		resp_data[2] = SMP_RESP_FUNC_FAILED;
		written = 0;
	} else
		resp_data[2] = SMP_RESP_FUNC_ACC;

	return written;
}

static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data,
				u8 phy_id)
{
	struct sas_rphy *rphy;
	struct dev_to_host_fis *fis;
	int i;

	if (phy_id >= sas_ha->num_phys) {
		resp_data[2] = SMP_RESP_NO_PHY;
		return;
	}

	resp_data[2] = SMP_RESP_PHY_NO_SATA;

	if (!sas_ha->sas_phy[phy_id]->port)
		return;

	rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
	fis = (struct dev_to_host_fis *)
		sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd;
	if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA)
		return;

	resp_data[2] = SMP_RESP_FUNC_ACC;
	resp_data[9] = phy_id;
	memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr,
	       SAS_ADDR_SIZE);

	/* check to see if we have a valid d2h fis */
	if (fis->fis_type != 0x34)
		return;

	/* the d2h fis is required by the standard to be in LE format */
	for (i = 0; i < 20; i += 4) {
		u8 *dst = resp_data + 24 + i, *src =
			&sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i];
		dst[0] = src[3];
		dst[1] = src[2];
		dst[2] = src[1];
		dst[3] = src[0];
	}
}

static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id,
			    u8 phy_op, enum sas_linkrate min,
			    enum sas_linkrate max, u8 *resp_data)
{
	struct sas_internal *i =
		to_sas_internal(sas_ha->core.shost->transportt);
	struct sas_phy_linkrates rates;

	if (phy_id >= sas_ha->num_phys) {
		resp_data[2] = SMP_RESP_NO_PHY;
		return;
	}
	switch (phy_op) {
	case PHY_FUNC_NOP:
	case PHY_FUNC_LINK_RESET:
	case PHY_FUNC_HARD_RESET:
	case PHY_FUNC_DISABLE:
	case PHY_FUNC_CLEAR_ERROR_LOG:
	case PHY_FUNC_CLEAR_AFFIL:
	case PHY_FUNC_TX_SATA_PS_SIGNAL:
		break;

	default:
		resp_data[2] = SMP_RESP_PHY_UNK_OP;
		return;
	}

	rates.minimum_linkrate = min;
	rates.maximum_linkrate = max;

	if (i->dft->lldd_control_phy(sas_ha->sas_phy[phy_id], phy_op, &rates))
		resp_data[2] = SMP_RESP_FUNC_FAILED;
	else
		resp_data[2] = SMP_RESP_FUNC_ACC;
}

int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
			 struct request *rsp)
{
	u8 *req_data = NULL, *resp_data = NULL, *buf;
	struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
	int error = -EINVAL;

	/* eight is the minimum size for request and response frames */
	if (blk_rq_bytes(req) < 8 || blk_rq_bytes(rsp) < 8)
		goto out;

	if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE ||
	    bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
		shost_printk(KERN_ERR, shost,
			"SMP request/response frame crosses page boundary");
		goto out;
	}

	req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);

	/* make sure frame can always be built ... we copy
	 * back only the requested length */
	resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);

	if (!req_data || !resp_data) {
		error = -ENOMEM;
		goto out;
	}

	local_irq_disable();
	buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
	memcpy(req_data, buf, blk_rq_bytes(req));
	kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
	local_irq_enable();

	if (req_data[0] != SMP_REQUEST)
		goto out;

	/* always succeeds ... even if we can't process the request
	 * the result is in the response frame */
	error = 0;

	/* set up default don't know response */
	resp_data[0] = SMP_RESPONSE;
	resp_data[1] = req_data[1];
	resp_data[2] = SMP_RESP_FUNC_UNK;

	switch (req_data[1]) {
	case SMP_REPORT_GENERAL:
		req->resid_len -= 8;
		rsp->resid_len -= 32;
		resp_data[2] = SMP_RESP_FUNC_ACC;
		resp_data[9] = sas_ha->num_phys;
		break;

	case SMP_REPORT_MANUF_INFO:
		req->resid_len -= 8;
		rsp->resid_len -= 64;
		resp_data[2] = SMP_RESP_FUNC_ACC;
		memcpy(resp_data + 12, shost->hostt->name,
		       SAS_EXPANDER_VENDOR_ID_LEN);
		memcpy(resp_data + 20, "libsas virt phy",
		       SAS_EXPANDER_PRODUCT_ID_LEN);
		break;

	case SMP_READ_GPIO_REG:
		/* FIXME: need GPIO support in the transport class */
		break;

	case SMP_DISCOVER:
		req->resid_len -= 16;
		if ((int)req->resid_len < 0) {
			req->resid_len = 0;
			error = -EINVAL;
			goto out;
		}
		rsp->resid_len -= 56;
		sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
		break;

	case SMP_REPORT_PHY_ERR_LOG:
		/* FIXME: could implement this with additional
		 * libsas callbacks providing the HW supports it */
		break;

	case SMP_REPORT_PHY_SATA:
		req->resid_len -= 16;
		if ((int)req->resid_len < 0) {
			req->resid_len = 0;
			error = -EINVAL;
			goto out;
		}
		rsp->resid_len -= 60;
		sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
		break;

	case SMP_REPORT_ROUTE_INFO:
		/* Can't implement; hosts have no routes */
		break;

	case SMP_WRITE_GPIO_REG: {
		/* SFF-8485 v0.7 */
		const int base_frame_size = 11;
		int to_write = req_data[4];

		if (blk_rq_bytes(req) < base_frame_size + to_write * 4 ||
		    req->resid_len < base_frame_size + to_write * 4) {
			resp_data[2] = SMP_RESP_INV_FRM_LEN;
			break;
		}

		to_write = sas_host_smp_write_gpio(sas_ha, resp_data, req_data[2],
						   req_data[3], to_write, &req_data[8]);
		req->resid_len -= base_frame_size + to_write * 4;
		rsp->resid_len -= 8;
		break;
	}

	case SMP_CONF_ROUTE_INFO:
		/* Can't implement; hosts have no routes */
		break;

	case SMP_PHY_CONTROL:
		req->resid_len -= 44;
		if ((int)req->resid_len < 0) {
			req->resid_len = 0;
			error = -EINVAL;
			goto out;
		}
		rsp->resid_len -= 8;
		sas_phy_control(sas_ha, req_data[9], req_data[10],
				req_data[32] >> 4, req_data[33] >> 4,
				resp_data);
		break;

	case SMP_PHY_TEST_FUNCTION:
		/* FIXME: should this be implemented? */
		break;

	default:
		/* probably a 2.0 function */
		break;
	}

	local_irq_disable();
	buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
	memcpy(buf, resp_data, blk_rq_bytes(rsp));
	flush_kernel_dcache_page(bio_page(rsp->bio));
	kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
	local_irq_enable();

 out:
	kfree(req_data);
	kfree(resp_data);
	return error;
}
Commit	Line	Data
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>
b98e66fa JB	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
	21	static 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
8ec6552f DW	54	/**
	55	* to_sas_gpio_gp_bit - given the gpio frame data find the byte/bit position of 'od'
	56	* @od: od bit to find
	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
	61	*
	62	* returns NULL if 'od' is not in 'data'
	63	*
	64	* From SFF-8485 v0.7:
	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).
	67	*
	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)."
	70	*
	71	* The general-purpose (raw-bitstream) RX registers have the same layout
	72	* although 'od' is renamed 'id' for 'input data'.
	73	*
	74	* SFF-8489 defines the behavior of the LEDs in response to the 'od' values.
	75	*/
	76	static u8 to_sas_gpio_gp_bit(unsigned int od, u8 data, u8 index, u8 count, u8 *bit)
	77	{
	78	unsigned int reg;
	79	u8 byte;
	80
	81	/* gp registers start at index 1 */
	82	if (index == 0)
	83	return NULL;
	84
	85	index--; /* make index 0-based */
	86	if (od < index * 32)
	87	return NULL;
	88
	89	od -= index * 32;
	90	reg = od >> 5;
	91
	92	if (reg >= count)
	93	return NULL;
	94
	95	od &= (1 << 5) - 1;
	96	byte = 3 - (od >> 3);
	97	*bit = od & ((1 << 3) - 1);
	98
	99	return &data[reg * 4 + byte];
	100	}
	101
	102	int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count)
	103	{
	104	u8 *byte;
	105	u8 bit;
	106
	107	byte = to_sas_gpio_gp_bit(od, data, index, count, &bit);
	108	if (!byte)
	109	return -1;
	110
	111	return (*byte >> bit) & 1;
	112	}
	113	EXPORT_SYMBOL(try_test_sas_gpio_gp_bit);
	114
	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,
	117	u8 *req_data)
118	{
119	struct sas_internal *i = to_sas_internal(sas_ha->core.shost->transportt);
120	int written;
121
122	if (i->dft->lldd_write_gpio == NULL) {
123	resp_data[2] = SMP_RESP_FUNC_UNK;
124	return 0;
125	}
126
127	written = i->dft->lldd_write_gpio(sas_ha, reg_type, reg_index,
128	reg_count, req_data);
129
130	if (written < 0) {
131	resp_data[2] = SMP_RESP_FUNC_FAILED;
132	written = 0;
133	} else
134	resp_data[2] = SMP_RESP_FUNC_ACC;
135
136	return written;
137	}
138
b98e66fa JB	139	static void sas_report_phy_sata(struct sas_ha_struct sas_ha, u8 resp_data,
	140	u8 phy_id)
	141	{
	142	struct sas_rphy *rphy;
	143	struct dev_to_host_fis *fis;
	144	int i;
	145
	146	if (phy_id >= sas_ha->num_phys) {
	147	resp_data[2] = SMP_RESP_NO_PHY;
	148	return;
	149	}
	150
	151	resp_data[2] = SMP_RESP_PHY_NO_SATA;
	152
	153	if (!sas_ha->sas_phy[phy_id]->port)
	154	return;
	155
	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)
	160	return;
	161
	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,
	165	SAS_ADDR_SIZE);
	166
	167	/* check to see if we have a valid d2h fis */
	168	if (fis->fis_type != 0x34)
	169	return;
	170
	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];
	175	dst[0] = src[3];
	176	dst[1] = src[2];
	177	dst[2] = src[1];
	178	dst[3] = src[0];
	179	}
	180	}
	181
	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)
	185	{
	186	struct sas_internal *i =
	187	to_sas_internal(sas_ha->core.shost->transportt);
	188	struct sas_phy_linkrates rates;
	189
	190	if (phy_id >= sas_ha->num_phys) {
	191	resp_data[2] = SMP_RESP_NO_PHY;
	192	return;
	193	}
	194	switch (phy_op) {
	195	case PHY_FUNC_NOP:
	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:
	202	break;
203
204	default:
205	resp_data[2] = SMP_RESP_PHY_UNK_OP;
206	return;
207	}
208
209	rates.minimum_linkrate = min;
210	rates.maximum_linkrate = max;
211
212	if (i->dft->lldd_control_phy(sas_ha->sas_phy[phy_id], phy_op, &rates))
213	resp_data[2] = SMP_RESP_FUNC_FAILED;
214	else
215	resp_data[2] = SMP_RESP_FUNC_ACC;
216	}
217
218	int sas_smp_host_handler(struct Scsi_Host shost, struct request req,
219	struct request *rsp)
220	{
221	u8 req_data = NULL, resp_data = NULL, *buf;
222	struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
c3a4d78c	223	int error = -EINVAL;
b98e66fa JB	224
b98e66fa JB	225	/* eight is the minimum size for request and response frames */
b0790410	226	if (blk_rq_bytes(req) < 8 \|\| blk_rq_bytes(rsp) < 8)
b98e66fa JB	227	goto out;
b98e66fa JB	228
b0790410 TH	229	if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE \|\|
b0790410 TH	230	bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
b98e66fa JB	231	shost_printk(KERN_ERR, shost,
	232	"SMP request/response frame crosses page boundary");
	233	goto out;
	234	}
	235
b0790410	236	req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
b98e66fa JB	237
	238	/* make sure frame can always be built ... we copy
	239	* back only the requested length */
b0790410	240	resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
b98e66fa JB	241
	242	if (!req_data \|\| !resp_data) {
	243	error = -ENOMEM;
	244	goto out;
	245	}
	246
	247	local_irq_disable();
	248	buf = kmap_atomic(bio_page(req->bio), KM_USER0) + bio_offset(req->bio);
b0790410	249	memcpy(req_data, buf, blk_rq_bytes(req));
b98e66fa JB	250	kunmap_atomic(buf - bio_offset(req->bio), KM_USER0);
	251	local_irq_enable();
	252
	253	if (req_data[0] != SMP_REQUEST)
	254	goto out;
	255
	256	/* always succeeds ... even if we can't process the request
	257	* the result is in the response frame */
	258	error = 0;
	259
	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;
	264
	265	switch (req_data[1]) {
	266	case SMP_REPORT_GENERAL:
c3a4d78c TH	267	req->resid_len -= 8;
c3a4d78c TH	268	rsp->resid_len -= 32;
b98e66fa JB	269	resp_data[2] = SMP_RESP_FUNC_ACC;
	270	resp_data[9] = sas_ha->num_phys;
	271	break;
	272
	273	case SMP_REPORT_MANUF_INFO:
c3a4d78c TH	274	req->resid_len -= 8;
c3a4d78c TH	275	rsp->resid_len -= 64;
b98e66fa JB	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);
	281	break;
	282
	283	case SMP_READ_GPIO_REG:
	284	/* FIXME: need GPIO support in the transport class */
	285	break;
	286
	287	case SMP_DISCOVER:
c3a4d78c TH	288	req->resid_len -= 16;
	289	if ((int)req->resid_len < 0) {
	290	req->resid_len = 0;
b98e66fa JB	291	error = -EINVAL;
	292	goto out;
	293	}
c3a4d78c	294	rsp->resid_len -= 56;
b98e66fa JB	295	sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
	296	break;
	297
	298	case SMP_REPORT_PHY_ERR_LOG:
	299	/* FIXME: could implement this with additional
	300	* libsas callbacks providing the HW supports it */
	301	break;
	302
	303	case SMP_REPORT_PHY_SATA:
c3a4d78c TH	304	req->resid_len -= 16;
	305	if ((int)req->resid_len < 0) {
	306	req->resid_len = 0;
b98e66fa JB	307	error = -EINVAL;
	308	goto out;
	309	}
c3a4d78c	310	rsp->resid_len -= 60;
b98e66fa JB	311	sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
	312	break;
	313
	314	case SMP_REPORT_ROUTE_INFO:
	315	/* Can't implement; hosts have no routes */
	316	break;
	317
8ec6552f DW	318	case SMP_WRITE_GPIO_REG: {
	319	/* SFF-8485 v0.7 */
	320	const int base_frame_size = 11;
	321	int to_write = req_data[4];
	322
	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;
	326	break;
	327	}
	328
	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;
	332	rsp->resid_len -= 8;
b98e66fa	333	break;
8ec6552f	334	}
b98e66fa JB	335
	336	case SMP_CONF_ROUTE_INFO:
	337	/* Can't implement; hosts have no routes */
	338	break;
	339
	340	case SMP_PHY_CONTROL:
c3a4d78c TH	341	req->resid_len -= 44;
	342	if ((int)req->resid_len < 0) {
	343	req->resid_len = 0;
b98e66fa JB	344	error = -EINVAL;
	345	goto out;
	346	}
c3a4d78c	347	rsp->resid_len -= 8;
b98e66fa JB	348	sas_phy_control(sas_ha, req_data[9], req_data[10],
	349	req_data[32] >> 4, req_data[33] >> 4,
	350	resp_data);
	351	break;
	352
	353	case SMP_PHY_TEST_FUNCTION:
	354	/* FIXME: should this be implemented? */
	355	break;
	356
	357	default:
	358	/* probably a 2.0 function */
	359	break;
	360	}
	361
	362	local_irq_disable();
	363	buf = kmap_atomic(bio_page(rsp->bio), KM_USER0) + bio_offset(rsp->bio);
b0790410	364	memcpy(buf, resp_data, blk_rq_bytes(rsp));
b98e66fa JB	365	flush_kernel_dcache_page(bio_page(rsp->bio));
	366	kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
	367	local_irq_enable();
b98e66fa JB	368
	369	out:
	370	kfree(req_data);
	371	kfree(resp_data);
	372	return error;
	373	}