// SPDX-License-Identifier: GPL-2.0-only
/*
* Serial Attached SCSI ( SAS ) Expander discovery and configuration
*
* Copyright ( C ) 2007 James E . J . Bottomley
* < James . Bottomley @ HansenPartnership . com >
*/
#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 32 nd bit ( i . e . , OD10 . 1 ) .
*
* In GPIO_TX [ 2 ] , bit 0 of byte 3 contains the 33 rd bit ( i . e . , OD10 . 2 )
* and bit 7 of byte 0 contains the 64 th 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->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 != 0 x34)
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->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;
}
void sas_smp_host_handler(struct bsg_job *job, struct Scsi_Host *shost)
{
struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
u8 *req_data, *resp_data;
unsigned int reslen = 0 ;
int error = -EINVAL;
/* eight is the minimum size for request and response frames */
if (job->request_payload.payload_len < 8 ||
job->reply_payload.payload_len < 8 )
goto out;
error = -ENOMEM;
req_data = kzalloc(job->request_payload.payload_len, GFP_KERNEL);
if (!req_data)
goto out;
sg_copy_to_buffer(job->request_payload.sg_list,
job->request_payload.sg_cnt, req_data,
job->request_payload.payload_len);
/* make sure frame can always be built ... we copy
* back only the requested length */
resp_data = kzalloc(max(job->reply_payload.payload_len, 128 U),
GFP_KERNEL);
if (!resp_data)
goto out_free_req;
error = -EINVAL;
if (req_data[0 ] != SMP_REQUEST)
goto out_free_resp;
/* 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:
resp_data[2 ] = SMP_RESP_FUNC_ACC;
resp_data[9 ] = sas_ha->num_phys;
reslen = 32 ;
break ;
case SMP_REPORT_MANUF_INFO:
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);
reslen = 64 ;
break ;
case SMP_READ_GPIO_REG:
/* FIXME: need GPIO support in the transport class */
break ;
case SMP_DISCOVER:
if (job->request_payload.payload_len < 16 )
goto out_free_resp;
sas_host_smp_discover(sas_ha, resp_data, req_data[9 ]);
reslen = 56 ;
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:
if (job->request_payload.payload_len < 16 )
goto out_free_resp;
sas_report_phy_sata(sas_ha, resp_data, req_data[9 ]);
reslen = 60 ;
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 (job->request_payload.payload_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 ]);
reslen = 8 ;
break ;
}
case SMP_CONF_ROUTE_INFO:
/* Can't implement; hosts have no routes */
break ;
case SMP_PHY_CONTROL:
if (job->request_payload.payload_len < 44 )
goto out_free_resp;
sas_phy_control(sas_ha, req_data[9 ], req_data[10 ],
req_data[32 ] >> 4 , req_data[33 ] >> 4 ,
resp_data);
reslen = 8 ;
break ;
case SMP_PHY_TEST_FUNCTION:
/* FIXME: should this be implemented? */
break ;
default :
/* probably a 2.0 function */
break ;
}
sg_copy_from_buffer(job->reply_payload.sg_list,
job->reply_payload.sg_cnt, resp_data,
job->reply_payload.payload_len);
error = 0 ;
out_free_resp:
kfree(resp_data);
out_free_req:
kfree(req_data);
out:
bsg_job_done(job, error, reslen);
}
Messung V0.5 in Prozent C=96 H=93 G=94
¤ Dauer der Verarbeitung: 0.12 Sekunden
(vorverarbeitet am 2026-09-28)
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