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authorXiaofei Tan <tanxiaofei@huawei.com>2018-05-21 18:09:23 +0800
committerMartin K. Petersen <martin.petersen@oracle.com>2018-05-28 22:40:32 -0400
commit31709548d2aca9861a72e2890d62fc87c52199de (patch)
tree80ec90612effbd594966ae1b279b39537e51e9cb /drivers
parentb09fcd09e9767f81187aa4036fb16d14e2f2fc79 (diff)
downloadlinux-31709548d2aca9861a72e2890d62fc87c52199de.tar.bz2
scsi: hisi_sas: Terminate STP reject quickly for v2 hw
For v2 hw, STP link from target is rejected after host reset because of a SoC bug. The STP reject will be terminated after we have sent IO from each PHY of a port. This is not an problem before, as we don't need to setup STP link from target immediately after host reset. But now, it is. Because we want to send soft-reset immediately after host reset. In order to terminate STP reject quickly, this patch send ATA reset command through each PHY of a port. Notes: ATA reset command don't need target's response. Besides, we do abort dev for each device before terminating STP reject. This is a quirk of v2 hw. Signed-off-by: Xiaofei Tan <tanxiaofei@huawei.com> Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/scsi/hisi_sas/hisi_sas_main.c78
1 files changed, 78 insertions, 0 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 4e8046ecf477..cd55849bcd07 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -1275,6 +1275,81 @@ static void hisi_sas_reset_init_all_devices(struct hisi_hba *hisi_hba)
}
}
+static void hisi_sas_send_ata_reset_each_phy(struct hisi_hba *hisi_hba,
+ struct asd_sas_port *sas_port,
+ struct domain_device *device)
+{
+ struct hisi_sas_tmf_task tmf_task = { .force_phy = 1 };
+ struct ata_port *ap = device->sata_dev.ap;
+ struct device *dev = hisi_hba->dev;
+ int s = sizeof(struct host_to_dev_fis);
+ int rc = TMF_RESP_FUNC_FAILED;
+ struct asd_sas_phy *sas_phy;
+ struct ata_link *link;
+ u8 fis[20] = {0};
+ u32 state;
+
+ state = hisi_hba->hw->get_phys_state(hisi_hba);
+ list_for_each_entry(sas_phy, &sas_port->phy_list, port_phy_el) {
+ if (!(state & BIT(sas_phy->id)))
+ continue;
+
+ ata_for_each_link(link, ap, EDGE) {
+ int pmp = sata_srst_pmp(link);
+
+ tmf_task.phy_id = sas_phy->id;
+ hisi_sas_fill_ata_reset_cmd(link->device, 1, pmp, fis);
+ rc = hisi_sas_exec_internal_tmf_task(device, fis, s,
+ &tmf_task);
+ if (rc != TMF_RESP_FUNC_COMPLETE) {
+ dev_err(dev, "phy%d ata reset failed rc=%d\n",
+ sas_phy->id, rc);
+ break;
+ }
+ }
+ }
+}
+
+static void hisi_sas_terminate_stp_reject(struct hisi_hba *hisi_hba)
+{
+ struct device *dev = hisi_hba->dev;
+ int port_no, rc, i;
+
+ for (i = 0; i < HISI_SAS_MAX_DEVICES; i++) {
+ struct hisi_sas_device *sas_dev = &hisi_hba->devices[i];
+ struct domain_device *device = sas_dev->sas_device;
+
+ if ((sas_dev->dev_type == SAS_PHY_UNUSED) || !device)
+ continue;
+
+ rc = hisi_sas_internal_task_abort(hisi_hba, device,
+ HISI_SAS_INT_ABT_DEV, 0);
+ if (rc < 0)
+ dev_err(dev, "STP reject: abort dev failed %d\n", rc);
+ }
+
+ for (port_no = 0; port_no < hisi_hba->n_phy; port_no++) {
+ struct hisi_sas_port *port = &hisi_hba->port[port_no];
+ struct asd_sas_port *sas_port = &port->sas_port;
+ struct domain_device *port_dev = sas_port->port_dev;
+ struct domain_device *device;
+
+ if (!port_dev || !DEV_IS_EXPANDER(port_dev->dev_type))
+ continue;
+
+ /* Try to find a SATA device */
+ list_for_each_entry(device, &sas_port->dev_list,
+ dev_list_node) {
+ if (dev_is_sata(device)) {
+ hisi_sas_send_ata_reset_each_phy(hisi_hba,
+ sas_port,
+ device);
+ break;
+ }
+ }
+ }
+}
+
static int hisi_sas_controller_reset(struct hisi_hba *hisi_hba)
{
struct device *dev = hisi_hba->dev;
@@ -1312,6 +1387,9 @@ static int hisi_sas_controller_reset(struct hisi_hba *hisi_hba)
hisi_hba->hw->phys_init(hisi_hba);
msleep(1000);
hisi_sas_refresh_port_id(hisi_hba);
+
+ if (hisi_hba->reject_stp_links_msk)
+ hisi_sas_terminate_stp_reject(hisi_hba);
hisi_sas_reset_init_all_devices(hisi_hba);
scsi_unblock_requests(shost);