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[SCSI] libsas: add host SMP processing 

This adds support for host side SMP processing, via a separate
SMP interpreter file.

Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
James Bottomley 2007-12-28 16:35:17 -06:00
parent 38b3167f75
commit b98e66fa0b
6 changed files with 305 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/scsi/libsas/Kconfig
View File

@ -38,6 +38,15 @@ config SCSI_SAS_ATA
Builds in ATA support into libsas. Will necessitate
the loading of libata along with libsas.
config SCSI_SAS_HOST_SMP
bool "Support for SMP interpretation for SAS hosts"
default y
depends on SCSI_SAS_LIBSAS
help
Allows sas hosts to receive SMP frames. Selecting this
option builds an SMP interpreter into libsas. Say
N here if you want to save the few kb this consumes.
config SCSI_SAS_LIBSAS_DEBUG
bool "Compile the SAS Domain Transport Attributes in debug mode"
default y

1
drivers/scsi/libsas/Makefile
View File

@ -35,3 +35,4 @@ libsas-y += sas_init.o \
sas_expander.o \
sas_scsi_host.o
libsas-$(CONFIG_SCSI_SAS_ATA) += sas_ata.o
libsas-$(CONFIG_SCSI_SAS_HOST_SMP) += sas_host_smp.o

8
drivers/scsi/libsas/sas_expander.c
View File

@ -1896,11 +1896,9 @@ int sas_smp_handler(struct Scsi_Host *shost, struct sas_rphy *rphy,
}
/* no rphy means no smp target support (ie aic94xx host) */
if (!rphy) {
printk("%s: can we send a smp request to a host?\n",
__FUNCTION__);
return -EINVAL;
}
if (!rphy)
return sas_smp_host_handler(shost, req, rsp);
type = rphy->identify.device_type;
if (type != SAS_EDGE_EXPANDER_DEVICE &&

274
drivers/scsi/libsas/sas_host_smp.c Normal file
View File

@ -0,0 +1,274 @@
/*
* 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 "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;
}
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, resp_data_len = rsp->data_len;
/* eight is the minimum size for request and response frames */
if (req->data_len < 8 || rsp->data_len < 8)
goto out;
if (bio_offset(req->bio) + req->data_len > PAGE_SIZE ||
bio_offset(rsp->bio) + rsp->data_len > PAGE_SIZE) {
shost_printk(KERN_ERR, shost,
"SMP request/response frame crosses page boundary");
goto out;
}
req_data = kzalloc(req->data_len, GFP_KERNEL);
/* make sure frame can always be built ... we copy
* back only the requested length */
resp_data = kzalloc(max(rsp->data_len, 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, req->data_len);
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->data_len -= 8;
resp_data_len -= 32;
resp_data[2] = SMP_RESP_FUNC_ACC;
resp_data[9] = sas_ha->num_phys;
break;
case SMP_REPORT_MANUF_INFO:
req->data_len -= 8;
resp_data_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->data_len =- 16;
if (req->data_len < 0) {
req->data_len = 0;
error = -EINVAL;
goto out;
}
resp_data_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->data_len =- 16;
if (req->data_len < 0) {
req->data_len = 0;
error = -EINVAL;
goto out;
}
resp_data_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:
/* FIXME: need GPIO support in the transport class */
break;
case SMP_CONF_ROUTE_INFO:
/* Can't implement; hosts have no routes */
break;
case SMP_PHY_CONTROL:
req->data_len =- 44;
if (req->data_len < 0) {
req->data_len = 0;
error = -EINVAL;
goto out;
}
resp_data_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, rsp->data_len);
flush_kernel_dcache_page(bio_page(rsp->bio));
kunmap_atomic(buf - bio_offset(rsp->bio), KM_USER0);
local_irq_enable();
rsp->data_len = resp_data_len;
out:
kfree(req_data);
kfree(resp_data);
return error;
}

14
drivers/scsi/libsas/sas_internal.h
View File

@ -80,6 +80,20 @@ struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy);
void sas_hae_reset(struct work_struct *work);
#ifdef CONFIG_SCSI_SAS_HOST_SMP
extern int sas_smp_host_handler(struct Scsi_Host *shost, struct request *req,
struct request *rsp);
#else
static inline int sas_smp_host_handler(struct Scsi_Host *shost,
struct request *req,
struct request *rsp)
{
shost_printk(KERN_ERR, shost,
"Cannot send SMP to a sas host (not enabled in CONFIG)\n");
return -EINVAL;
}
#endif
static inline void sas_queue_event(int event, spinlock_t *lock,
unsigned long *pending,
struct work_struct *work,

8
include/scsi/scsi_transport_sas.h
View File

@ -11,10 +11,10 @@ struct sas_rphy;
struct request;
enum sas_device_type {
SAS_PHY_UNUSED,
SAS_END_DEVICE,
SAS_EDGE_EXPANDER_DEVICE,
SAS_FANOUT_EXPANDER_DEVICE,
SAS_PHY_UNUSED = 0,
SAS_END_DEVICE = 1,
SAS_EDGE_EXPANDER_DEVICE = 2,
SAS_FANOUT_EXPANDER_DEVICE = 3,
};
static inline int sas_protocol_ata(enum sas_protocol proto)