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scsi: hisi_sas: Create a scsi_host_template per HW module 

When a SCSI host is registered, the SCSI mid-layer takes a reference to a
module in Scsi_host.hostt.module. In doing this, we are prevented from
removing the driver module for the host in dangerous scenario, like when a
disk is mounted.

Currently there is only one scsi_host_template (sht) for all HW versions,
and this is the main.c module. So this means that we can possibly remove
the HW module in this dangerous scenario, as SCSI mid-layer is only
referencing the main.c module.

To fix this, create a sht per module, referencing that same module to
create the Scsi host.

Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Xiang Chen 2018-05-21 18:09:18 +08:00 committed by Martin K. Petersen
parent d5a60dfdb3
commit 235bfc7ff6
5 changed files with 86 additions and 33 deletions
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8
drivers/scsi/hisi_sas/hisi_sas.h
View File

@ -248,6 +248,7 @@ struct hisi_sas_hw {
u8 reg_index, u8 reg_count, u8 *write_data);
int max_command_entries;
int complete_hdr_size;
struct scsi_host_template *sht;
};
struct hisi_hba {
@ -440,8 +441,6 @@ struct hisi_sas_slot_buf_table {
};
extern struct scsi_transport_template *hisi_sas_stt;
extern struct scsi_host_template *hisi_sas_sht;
extern void hisi_sas_stop_phys(struct hisi_hba *hisi_hba);
extern int hisi_sas_alloc(struct hisi_hba *hisi_hba, struct Scsi_Host *shost);
extern void hisi_sas_free(struct hisi_hba *hisi_hba);
@ -456,6 +455,11 @@ extern int hisi_sas_probe(struct platform_device *pdev,
const struct hisi_sas_hw *ops);
extern int hisi_sas_remove(struct platform_device *pdev);
extern int hisi_sas_slave_configure(struct scsi_device *sdev);
extern int hisi_sas_scan_finished(struct Scsi_Host *shost, unsigned long time);
extern void hisi_sas_scan_start(struct Scsi_Host *shost);
extern struct device_attribute *host_attrs[];
extern int hisi_sas_host_reset(struct Scsi_Host *shost, int reset_type);
extern void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy);
extern void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba,
struct sas_task *task,

40
drivers/scsi/hisi_sas/hisi_sas_main.c
View File

@ -719,7 +719,7 @@ err_out:
return rc;
}
static int hisi_sas_slave_configure(struct scsi_device *sdev)
int hisi_sas_slave_configure(struct scsi_device *sdev)
{
struct domain_device *dev = sdev_to_domain_dev(sdev);
int ret = sas_slave_configure(sdev);
@ -731,15 +731,17 @@ static int hisi_sas_slave_configure(struct scsi_device *sdev)
return 0;
}
EXPORT_SYMBOL_GPL(hisi_sas_slave_configure);
static void hisi_sas_scan_start(struct Scsi_Host *shost)
void hisi_sas_scan_start(struct Scsi_Host *shost)
{
struct hisi_hba *hisi_hba = shost_priv(shost);
hisi_hba->hw->phys_init(hisi_hba);
}
EXPORT_SYMBOL_GPL(hisi_sas_scan_start);
static int hisi_sas_scan_finished(struct Scsi_Host *shost, unsigned long time)
int hisi_sas_scan_finished(struct Scsi_Host *shost, unsigned long time)
{
struct hisi_hba *hisi_hba = shost_priv(shost);
struct sas_ha_struct *sha = &hisi_hba->sha;
@ -751,6 +753,7 @@ static int hisi_sas_scan_finished(struct Scsi_Host *shost, unsigned long time)
sas_drain_work(sha);
return 1;
}
EXPORT_SYMBOL_GPL(hisi_sas_scan_finished);
static void hisi_sas_phyup_work(struct work_struct *work)
{
@ -1824,34 +1827,11 @@ EXPORT_SYMBOL_GPL(hisi_sas_kill_tasklets);
struct scsi_transport_template *hisi_sas_stt;
EXPORT_SYMBOL_GPL(hisi_sas_stt);
static struct device_attribute *host_attrs[] = {
struct device_attribute *host_attrs[] = {
&dev_attr_phy_event_threshold,
NULL,
};
static struct scsi_host_template _hisi_sas_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.queuecommand = sas_queuecommand,
.target_alloc = sas_target_alloc,
.slave_configure = hisi_sas_slave_configure,
.scan_finished = hisi_sas_scan_finished,
.scan_start = hisi_sas_scan_start,
.change_queue_depth = sas_change_queue_depth,
.bios_param = sas_bios_param,
.can_queue = 1,
.this_id = -1,
.sg_tablesize = SG_ALL,
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
.shost_attrs = host_attrs,
};
struct scsi_host_template *hisi_sas_sht = &_hisi_sas_sht;
EXPORT_SYMBOL_GPL(hisi_sas_sht);
EXPORT_SYMBOL_GPL(host_attrs);
static struct sas_domain_function_template hisi_sas_transport_ops = {
.lldd_dev_found = hisi_sas_dev_found,
@ -2161,7 +2141,7 @@ static struct Scsi_Host *hisi_sas_shost_alloc(struct platform_device *pdev,
struct hisi_hba *hisi_hba;
struct device *dev = &pdev->dev;
shost = scsi_host_alloc(hisi_sas_sht, sizeof(*hisi_hba));
shost = scsi_host_alloc(hw->sht, sizeof(*hisi_hba));
if (!shost) {
dev_err(dev, "scsi host alloc failed\n");
return NULL;
@ -2211,7 +2191,7 @@ err_out:
}
int hisi_sas_probe(struct platform_device *pdev,
const struct hisi_sas_hw *hw)
const struct hisi_sas_hw *hw)
{
struct Scsi_Host *shost;
struct hisi_hba *hisi_hba;

23
drivers/scsi/hisi_sas/hisi_sas_v1_hw.c
View File

@ -1788,6 +1788,28 @@ static int hisi_sas_v1_init(struct hisi_hba *hisi_hba)
return 0;
}
static struct scsi_host_template sht_v1_hw = {
.name = DRV_NAME,
.module = THIS_MODULE,
.queuecommand = sas_queuecommand,
.target_alloc = sas_target_alloc,
.slave_configure = hisi_sas_slave_configure,
.scan_finished = hisi_sas_scan_finished,
.scan_start = hisi_sas_scan_start,
.change_queue_depth = sas_change_queue_depth,
.bios_param = sas_bios_param,
.can_queue = 1,
.this_id = -1,
.sg_tablesize = SG_ALL,
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
.shost_attrs = host_attrs,
};
static const struct hisi_sas_hw hisi_sas_v1_hw = {
.hw_init = hisi_sas_v1_init,
.setup_itct = setup_itct_v1_hw,
@ -1807,6 +1829,7 @@ static const struct hisi_sas_hw hisi_sas_v1_hw = {
.get_wideport_bitmap = get_wideport_bitmap_v1_hw,
.max_command_entries = HISI_SAS_COMMAND_ENTRIES_V1_HW,
.complete_hdr_size = sizeof(struct hisi_sas_complete_v1_hdr),
.sht = &sht_v1_hw,
};
static int hisi_sas_v1_probe(struct platform_device *pdev)

24
drivers/scsi/hisi_sas/hisi_sas_v2_hw.c
View File

@ -3501,6 +3501,29 @@ static int write_gpio_v2_hw(struct hisi_hba *hisi_hba, u8 reg_type,
return 0;
}
static struct scsi_host_template sht_v2_hw = {
.name = DRV_NAME,
.module = THIS_MODULE,
.queuecommand = sas_queuecommand,
.target_alloc = sas_target_alloc,
.slave_configure = hisi_sas_slave_configure,
.scan_finished = hisi_sas_scan_finished,
.scan_start = hisi_sas_scan_start,
.change_queue_depth = sas_change_queue_depth,
.bios_param = sas_bios_param,
.can_queue = 1,
.this_id = -1,
.sg_tablesize = SG_ALL,
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
.shost_attrs = host_attrs,
};
static const struct hisi_sas_hw hisi_sas_v2_hw = {
.hw_init = hisi_sas_v2_init,
.setup_itct = setup_itct_v2_hw,
@ -3529,6 +3552,7 @@ static const struct hisi_sas_hw hisi_sas_v2_hw = {
.soft_reset = soft_reset_v2_hw,
.get_phys_state = get_phys_state_v2_hw,
.write_gpio = write_gpio_v2_hw,
.sht = &sht_v2_hw,
};
static int hisi_sas_v2_probe(struct platform_device *pdev)

24
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
View File

@ -2015,6 +2015,28 @@ static int write_gpio_v3_hw(struct hisi_hba *hisi_hba, u8 reg_type,
return 0;
}
static struct scsi_host_template sht_v3_hw = {
.name = DRV_NAME,
.module = THIS_MODULE,
.queuecommand = sas_queuecommand,
.target_alloc = sas_target_alloc,
.slave_configure = hisi_sas_slave_configure,
.scan_finished = hisi_sas_scan_finished,
.scan_start = hisi_sas_scan_start,
.change_queue_depth = sas_change_queue_depth,
.bios_param = sas_bios_param,
.can_queue = 1,
.this_id = -1,
.sg_tablesize = SG_ALL,
.max_sectors = SCSI_DEFAULT_MAX_SECTORS,
.use_clustering = ENABLE_CLUSTERING,
.eh_device_reset_handler = sas_eh_device_reset_handler,
.eh_target_reset_handler = sas_eh_target_reset_handler,
.target_destroy = sas_target_destroy,
.ioctl = sas_ioctl,
.shost_attrs = host_attrs,
};
static const struct hisi_sas_hw hisi_sas_v3_hw = {
.hw_init = hisi_sas_v3_init,
.setup_itct = setup_itct_v3_hw,
@ -2050,7 +2072,7 @@ hisi_sas_shost_alloc_pci(struct pci_dev *pdev)
struct hisi_hba *hisi_hba;
struct device *dev = &pdev->dev;
shost = scsi_host_alloc(hisi_sas_sht, sizeof(*hisi_hba));
shost = scsi_host_alloc(&sht_v3_hw, sizeof(*hisi_hba));
if (!shost) {
dev_err(dev, "shost alloc failed\n");
return NULL;