[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 <linux/export.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;
	struct asd_sas_phy *asd_phy;

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

	asd_phy = sas_ha->sas_phy[phy_id];
	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;

	/* filter reset requests through libata eh */
	if (phy_op == PHY_FUNC_LINK_RESET && sas_try_ata_reset(asd_phy) == 0) {
		resp_data[2] = SMP_RESP_FUNC_ACC;
		return;
	}

	if (i->dft->lldd_control_phy(asd_phy, 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));
	memcpy(req_data, buf, blk_rq_bytes(req));
	kunmap_atomic(buf - bio_offset(req->bio));
	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:
		scsi_req(req)->resid_len -= 8;
		scsi_req(rsp)->resid_len -= 32;
		resp_data[2] = SMP_RESP_FUNC_ACC;
		resp_data[9] = sas_ha->num_phys;
		break;

	case SMP_REPORT_MANUF_INFO:
		scsi_req(req)->resid_len -= 8;
		scsi_req(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:
		scsi_req(req)->resid_len -= 16;
		if ((int)scsi_req(req)->resid_len < 0) {
			scsi_req(req)->resid_len = 0;
			error = -EINVAL;
			goto out;
		}
		scsi_req(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:
		scsi_req(req)->resid_len -= 16;
		if ((int)scsi_req(req)->resid_len < 0) {
			scsi_req(req)->resid_len = 0;
			error = -EINVAL;
			goto out;
		}
		scsi_req(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 ||
		    scsi_req(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]);
		scsi_req(req)->resid_len -= base_frame_size + to_write * 4;
		scsi_req(rsp)->resid_len -= 8;
		break;
	}

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

	case SMP_PHY_CONTROL:
		scsi_req(req)->resid_len -= 44;
		if ((int)scsi_req(req)->resid_len < 0) {
			scsi_req(req)->resid_len = 0;
			error = -EINVAL;
			goto out;
		}
		scsi_req(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));
	memcpy(buf, resp_data, blk_rq_bytes(rsp));
	flush_kernel_dcache_page(bio_page(rsp->bio));
	kunmap_atomic(buf - bio_offset(rsp->bio));
	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>
09703660	14	#include <linux/export.h>
b98e66fa JB	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
	22	static 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
8ec6552f DW	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	*/
	77	static 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
	103	int 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	}
	114	EXPORT_SYMBOL(try_test_sas_gpio_gp_bit);
	115
	116	static 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
b98e66fa JB	140	static 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
	183	static 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;
ab526633	190	struct asd_sas_phy *asd_phy;
b98e66fa JB	191
	192	if (phy_id >= sas_ha->num_phys) {
	193	resp_data[2] = SMP_RESP_NO_PHY;
	194	return;
	195	}
ab526633 DW	196
ab526633 DW	197	asd_phy = sas_ha->sas_phy[phy_id];
b98e66fa JB	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
ab526633 DW	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))
b98e66fa JB	223	resp_data[2] = SMP_RESP_FUNC_FAILED;
	224	else
	225	resp_data[2] = SMP_RESP_FUNC_ACC;
	226	}
	227
	228	int 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);
c3a4d78c	233	int error = -EINVAL;
b98e66fa JB	234
b98e66fa JB	235	/* eight is the minimum size for request and response frames */
b0790410	236	if (blk_rq_bytes(req) < 8 \|\| blk_rq_bytes(rsp) < 8)
b98e66fa JB	237	goto out;
b98e66fa JB	238
b0790410 TH	239	if (bio_offset(req->bio) + blk_rq_bytes(req) > PAGE_SIZE \|\|
b0790410 TH	240	bio_offset(rsp->bio) + blk_rq_bytes(rsp) > PAGE_SIZE) {
b98e66fa JB	241	shost_printk(KERN_ERR, shost,
	242	"SMP request/response frame crosses page boundary");
	243	goto out;
	244	}
	245
b0790410	246	req_data = kzalloc(blk_rq_bytes(req), GFP_KERNEL);
b98e66fa JB	247
	248	/* make sure frame can always be built ... we copy
	249	* back only the requested length */
b0790410	250	resp_data = kzalloc(max(blk_rq_bytes(rsp), 128U), GFP_KERNEL);
b98e66fa JB	251
	252	if (!req_data \|\| !resp_data) {
	253	error = -ENOMEM;
	254	goto out;
	255	}
	256
	257	local_irq_disable();
77dfce07	258	buf = kmap_atomic(bio_page(req->bio));
b0790410	259	memcpy(req_data, buf, blk_rq_bytes(req));
77dfce07	260	kunmap_atomic(buf - bio_offset(req->bio));
b98e66fa JB	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:
82ed4db4 CH	277	scsi_req(req)->resid_len -= 8;
82ed4db4 CH	278	scsi_req(rsp)->resid_len -= 32;
b98e66fa JB	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:
82ed4db4 CH	284	scsi_req(req)->resid_len -= 8;
82ed4db4 CH	285	scsi_req(rsp)->resid_len -= 64;
b98e66fa JB	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:
82ed4db4 CH	298	scsi_req(req)->resid_len -= 16;
	299	if ((int)scsi_req(req)->resid_len < 0) {
	300	scsi_req(req)->resid_len = 0;
b98e66fa JB	301	error = -EINVAL;
	302	goto out;
	303	}
82ed4db4	304	scsi_req(rsp)->resid_len -= 56;
b98e66fa JB	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:
82ed4db4 CH	314	scsi_req(req)->resid_len -= 16;
	315	if ((int)scsi_req(req)->resid_len < 0) {
	316	scsi_req(req)->resid_len = 0;
b98e66fa JB	317	error = -EINVAL;
	318	goto out;
	319	}
82ed4db4	320	scsi_req(rsp)->resid_len -= 60;
b98e66fa JB	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
8ec6552f DW	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 \|\|
82ed4db4	334	scsi_req(req)->resid_len < base_frame_size + to_write * 4) {
8ec6552f DW	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]);
82ed4db4 CH	341	scsi_req(req)->resid_len -= base_frame_size + to_write * 4;
82ed4db4 CH	342	scsi_req(rsp)->resid_len -= 8;
b98e66fa	343	break;
8ec6552f	344	}
b98e66fa JB	345
	346	case SMP_CONF_ROUTE_INFO:
	347	/* Can't implement; hosts have no routes */
	348	break;
	349
	350	case SMP_PHY_CONTROL:
82ed4db4 CH	351	scsi_req(req)->resid_len -= 44;
	352	if ((int)scsi_req(req)->resid_len < 0) {
	353	scsi_req(req)->resid_len = 0;
b98e66fa JB	354	error = -EINVAL;
	355	goto out;
	356	}
82ed4db4	357	scsi_req(rsp)->resid_len -= 8;
b98e66fa JB	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();
77dfce07	373	buf = kmap_atomic(bio_page(rsp->bio));
b0790410	374	memcpy(buf, resp_data, blk_rq_bytes(rsp));
b98e66fa	375	flush_kernel_dcache_page(bio_page(rsp->bio));
77dfce07	376	kunmap_atomic(buf - bio_offset(rsp->bio));
b98e66fa	377	local_irq_enable();
b98e66fa JB	378
	379	out:
	380	kfree(req_data);
	381	kfree(resp_data);
	382	return error;
	383	}