drivers/scsi/libsas/sas_host_smp.c - linux - Git at Google

 /*
  * 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;
 }
	/*
	* 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;
	}