unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
1
Fork 0
Code Pull requests 5 Wiki Activity

[SCSI] sas: add support for PHY resets

Browse source 
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Christoph Hellwig 2005-10-19 20:01:31 +02:00 committed by James Bottomley
parent ac01bbbd3b
commit 07ba3a9547
2 changed files with 42 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

43
drivers/scsi/scsi_transport_sas.c
View file

@ -34,7 +34,7 @@
#define SAS_HOST_ATTRS 0
#define SAS_PORT_ATTRS 15
#define SAS_PORT_ATTRS 17
#define SAS_RPORT_ATTRS 5
struct sas_internal {
@ -289,9 +289,39 @@ show_sas_device_type(struct class_device *cdev, char *buf)
return snprintf(buf, 20, "none\n");
return get_sas_device_type_names(phy->identify.device_type, buf);
}
static CLASS_DEVICE_ATTR(device_type, S_IRUGO, show_sas_device_type, NULL);
static ssize_t do_sas_phy_reset(struct class_device *cdev,
size_t count, int hard_reset)
{
struct sas_phy *phy = transport_class_to_phy(cdev);
struct Scsi_Host *shost = dev_to_shost(phy->dev.parent);
struct sas_internal *i = to_sas_internal(shost->transportt);
int error;
if (!phy->local_attached)
return -EINVAL;
error = i->f->phy_reset(phy, hard_reset);
if (error)
return error;
return count;
};
static ssize_t store_sas_link_reset(struct class_device *cdev,
const char *buf, size_t count)
{
return do_sas_phy_reset(cdev, count, 0);
}
static CLASS_DEVICE_ATTR(link_reset, S_IWUSR, NULL, store_sas_link_reset);
static ssize_t store_sas_hard_reset(struct class_device *cdev,
const char *buf, size_t count)
{
return do_sas_phy_reset(cdev, count, 1);
}
static CLASS_DEVICE_ATTR(hard_reset, S_IWUSR, NULL, store_sas_hard_reset);
sas_phy_protocol_attr(identify.initiator_port_protocols,
initiator_port_protocols);
sas_phy_protocol_attr(identify.target_port_protocols,
@ -725,6 +755,13 @@ static struct device *sas_target_parent(struct Scsi_Host *shost,
i->phy_attrs[count] = &i->private_phy_attrs[count]; \
count++
#define SETUP_PORT_ATTRIBUTE_WRONLY(field) \
i->private_phy_attrs[count] = class_device_attr_##field; \
i->private_phy_attrs[count].attr.mode = S_IWUGO; \
i->private_phy_attrs[count].show = NULL; \
i->phy_attrs[count] = &i->private_phy_attrs[count]; \
count++
/**
* sas_attach_transport -- instantiate SAS transport template
@ -781,6 +818,8 @@ sas_attach_transport(struct sas_function_template *ft)
SETUP_PORT_ATTRIBUTE(running_disparity_error_count);
SETUP_PORT_ATTRIBUTE(loss_of_dword_sync_count);
SETUP_PORT_ATTRIBUTE(phy_reset_problem_count);
SETUP_PORT_ATTRIBUTE_WRONLY(link_reset);
SETUP_PORT_ATTRIBUTE_WRONLY(hard_reset);
i->phy_attrs[count] = NULL;
count = 0;

1
include/scsi/scsi_transport_sas.h
View file

@ -94,6 +94,7 @@ struct sas_rphy {
/* The functions by which the transport class and the driver communicate */
struct sas_function_template {
int (*get_linkerrors)(struct sas_phy *);
int (*phy_reset)(struct sas_phy *, int);
};