4.19-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit efdcad62e7b8a02fcccc5ccca57806dce1482ac8 ]
When the PHY comes down, we currently do not set the negotiated linkrate:
root@(none)$ pwd /sys/class/sas_phy/phy-0:0 root@(none)$ more enable 1 root@(none)$ more negotiated_linkrate 12.0 Gbit root@(none)$ echo 0 > enable root@(none)$ more negotiated_linkrate 12.0 Gbit root@(none)$
This patch fixes the driver code to set it properly when the PHY comes down.
If the PHY had been enabled, then set unknown; otherwise, flag as disabled.
The logical place to set the negotiated linkrate for this scenario is PHY down routine, which is called from the PHY down ISR.
However, it is not possible to know if the PHY comes down due to PHY disable or loss of link, as sas_phy.enabled member is not set until after the transport disable routine is complete, which races with the PHY down ISR.
As an imperfect solution, use sas_phy_data.enable as the flag to know if the PHY is down due to disable. It's imperfect, as sas_phy_data is internal to libsas.
I can't see another way without adding a new field to hisi_sas_phy and managing it, or changing SCSI SAS transport.
Signed-off-by: John Garry john.garry@huawei.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/hisi_sas/hisi_sas_main.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c index a4e2e6aa9a6b..c25f3a9b0b9f 100644 --- a/drivers/scsi/hisi_sas/hisi_sas_main.c +++ b/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -10,6 +10,7 @@ */
#include "hisi_sas.h" +#include "../libsas/sas_internal.h" #define DRV_NAME "hisi_sas"
#define DEV_IS_GONE(dev) \ @@ -1879,9 +1880,18 @@ static int hisi_sas_write_gpio(struct sas_ha_struct *sha, u8 reg_type,
static void hisi_sas_phy_disconnected(struct hisi_sas_phy *phy) { + struct asd_sas_phy *sas_phy = &phy->sas_phy; + struct sas_phy *sphy = sas_phy->phy; + struct sas_phy_data *d = sphy->hostdata; + phy->phy_attached = 0; phy->phy_type = 0; phy->port = NULL; + + if (d->enable) + sphy->negotiated_linkrate = SAS_LINK_RATE_UNKNOWN; + else + sphy->negotiated_linkrate = SAS_PHY_DISABLED; }
void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy)