scsi: hisi_sas: Pass gfp_t flags to libsas event notifiers

mainline inclusion
from mainline-master
commit 26c7efc3
category: bugfix
bugzilla: 175270
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=26c7efc3f95260fd90e6cb268b47a58cf27ffc64

------------------------------------------------------------------------

Use the new libsas event notifiers API, which requires callers to
explicitly pass the gfp_t memory allocation flags.

Below are the context analysis for modified functions:

=> hisi_sas_bytes_dmaed():

Since it is invoked from both process and atomic contexts, let its callers
pass the gfp_t flags:

  * hisi_sas_main.c:
  ------------------

    hisi_sas_phyup_work(): workqueue context
      -> hisi_sas_bytes_dmaed(..., GFP_KERNEL)

    hisi_sas_controller_reset_done(): has an msleep()
      -> hisi_sas_rescan_topology()
        -> hisi_sas_phy_down()
          -> hisi_sas_bytes_dmaed(..., GFP_KERNEL)

    hisi_sas_debug_I_T_nexus_reset(): calls wait_for_completion_timeout()
      -> hisi_sas_phy_down()
        -> hisi_sas_bytes_dmaed(..., GFP_KERNEL)

  * hisi_sas_v1_hw.c:
  -------------------

    int_abnormal_v1_hw(): irq handler
      -> hisi_sas_phy_down()
        -> hisi_sas_bytes_dmaed(..., GFP_ATOMIC)

  * hisi_sas_v[23]_hw.c:
  ----------------------

    int_phy_updown_v[23]_hw(): irq handler
      -> phy_down_v[23]_hw()
        -> hisi_sas_phy_down()
          -> hisi_sas_bytes_dmaed(..., GFP_ATOMIC)

=> int_bcast_v1_hw() and phy_bcast_v3_hw():

Both are invoked exclusively from irq handlers. Pass GFP_ATOMIC.

Link: https://lore.kernel.org/r/20210118100955.1761652-12-a.darwish@linutronix.deReviewed-by: NJohn Garry <john.garry@huawei.com>
Signed-off-by: NAhmed S. Darwish <a.darwish@linutronix.de>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: NOuyangdelong <ouyangdelong@huawei.com>
Signed-off-by: NNifujia <nifujia1@hisilicon.com>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

drivers/scsi/hisi_sas/hisi_sas.h

@@ -637,7 +637,8 @@ extern void hisi_sas_scan_start(struct Scsi_Host *shost);
 extern int hisi_sas_host_reset(struct Scsi_Host *shost, int reset_type);
 extern void hisi_sas_phy_enable(struct hisi_hba *hisi_hba, int phy_no,
 				int enable);
-extern void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy);
+extern void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy,
+			      gfp_t gfp_flags);
 extern void hisi_sas_slot_task_free(struct hisi_hba *hisi_hba,
 				    struct sas_task *task,
 				    struct hisi_sas_slot *slot);

drivers/scsi/hisi_sas/hisi_sas_main.c

@@ -612,7 +612,8 @@ static int hisi_sas_task_exec(struct sas_task *task, gfp_t gfp_flags,
 	return rc;
 }
 
-static void hisi_sas_bytes_dmaed(struct hisi_hba *hisi_hba, int phy_no)
+static void hisi_sas_bytes_dmaed(struct hisi_hba *hisi_hba, int phy_no,
+				 gfp_t gfp_flags)
 {
 	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
 	struct asd_sas_phy *sas_phy = &phy->sas_phy;
@@ -626,7 +627,7 @@ static void hisi_sas_bytes_dmaed(struct hisi_hba *hisi_hba, int phy_no)
 		return;
 	}
 
-	sas_notify_phy_event(sas_phy, PHYE_OOB_DONE);
+	sas_notify_phy_event_gfp(sas_phy, PHYE_OOB_DONE, gfp_flags);
 
 	if (sas_phy->phy) {
 		struct sas_phy *sphy = sas_phy->phy;
@@ -654,7 +655,7 @@ static void hisi_sas_bytes_dmaed(struct hisi_hba *hisi_hba, int phy_no)
 	}
 
 	sas_phy->frame_rcvd_size = phy->frame_rcvd_size;
-	sas_notify_port_event(sas_phy, PORTE_BYTES_DMAED);
+	sas_notify_port_event_gfp(sas_phy, PORTE_BYTES_DMAED, gfp_flags);
 }
 
 static struct hisi_sas_device *hisi_sas_alloc_dev(struct domain_device *device)
@@ -860,7 +861,7 @@ static void hisi_sas_phyup_work(struct work_struct *work)
 
 	if (phy->identify.target_port_protocols == SAS_PROTOCOL_SSP)
 		hisi_hba->hw->sl_notify_ssp(hisi_hba, phy_no);
-	hisi_sas_bytes_dmaed(hisi_hba, phy_no);
+	hisi_sas_bytes_dmaed(hisi_hba, phy_no, GFP_KERNEL);
 }
 
 static void hisi_sas_linkreset_work(struct work_struct *work)
@@ -1429,11 +1430,12 @@ static void hisi_sas_rescan_topology(struct hisi_hba *hisi_hba, u32 state)
 				_sas_port = sas_port;
 
 				if (dev_is_expander(dev->dev_type))
-					sas_notify_port_event(sas_phy,
-							PORTE_BROADCAST_RCVD);
+					sas_notify_port_event_gfp(sas_phy,
+							PORTE_BROADCAST_RCVD,
+							GFP_KERNEL);
 			}
 		} else {
-			hisi_sas_phy_down(hisi_hba, phy_no, 0);
+			hisi_sas_phy_down(hisi_hba, phy_no, 0, GFP_KERNEL);
 		}
 	}
 }
@@ -1787,7 +1789,7 @@ static int hisi_sas_debug_I_T_nexus_reset(struct domain_device *device)
 
 		/* report PHY down if timed out */
 		if (!ret)
-			hisi_sas_phy_down(hisi_hba, sas_phy->id, 0);
+			hisi_sas_phy_down(hisi_hba, sas_phy->id, 0, GFP_KERNEL);
 	} else if (sas_dev->dev_status != HISI_SAS_DEV_INIT) {
 		/*
 		 * If in init state, we rely on caller to wait for link to be
@@ -2187,7 +2189,8 @@ static void hisi_sas_phy_disconnected(struct hisi_sas_phy *phy)
 	spin_unlock_irqrestore(&phy->lock, flags);
 }
 
-void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy)
+void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy,
+		       gfp_t gfp_flags)
 {
 	struct hisi_sas_phy *phy = &hisi_hba->phy[phy_no];
 	struct asd_sas_phy *sas_phy = &phy->sas_phy;
@@ -2195,7 +2198,7 @@ void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy)
 
 	if (rdy) {
 		/* Phy down but ready */
-		hisi_sas_bytes_dmaed(hisi_hba, phy_no);
+		hisi_sas_bytes_dmaed(hisi_hba, phy_no, gfp_flags);
 		hisi_sas_port_notify_formed(sas_phy);
 	} else {
 		struct hisi_sas_port *port  = phy->port;
@@ -2206,7 +2209,8 @@ void hisi_sas_phy_down(struct hisi_hba *hisi_hba, int phy_no, int rdy)
 			return;
 		}
 		/* Phy down and not ready */
-		sas_notify_phy_event(sas_phy, PHYE_LOSS_OF_SIGNAL);
+		sas_notify_phy_event_gfp(sas_phy,
+					 PHYE_LOSS_OF_SIGNAL, gfp_flags);
 		sas_phy_disconnected(sas_phy);
 
 		if (port) {

drivers/scsi/hisi_sas/hisi_sas_v1_hw.c

@@ -1423,7 +1423,8 @@ static irqreturn_t int_bcast_v1_hw(int irq, void *p)
 	}
 
 	if (!test_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags))
-		sas_notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
+		sas_notify_port_event_gfp(sas_phy, PORTE_BROADCAST_RCVD,
+					  GFP_ATOMIC);
 
 end:
 	hisi_sas_phy_write32(hisi_hba, phy_no, CHL_INT2,
@@ -1452,7 +1453,8 @@ static irqreturn_t int_abnormal_v1_hw(int irq, void *p)
 		u32 phy_state = hisi_sas_read32(hisi_hba, PHY_STATE);
 
 		hisi_sas_phy_down(hisi_hba, phy_no,
-				  (phy_state & 1 << phy_no) ? 1 : 0);
+				  (phy_state & 1 << phy_no) ? 1 : 0,
+				  GFP_ATOMIC);
 	}
 
 	if (irq_value & CHL_INT0_ID_TIMEOUT_MSK)

drivers/scsi/hisi_sas/hisi_sas_v2_hw.c

@@ -2734,7 +2734,8 @@ static int phy_down_v2_hw(int phy_no, struct hisi_hba *hisi_hba)
 
 	phy_state = hisi_sas_read32(hisi_hba, PHY_STATE);
 	dev_info(dev, "phydown: phy%d phy_state=0x%x\n", phy_no, phy_state);
-	hisi_sas_phy_down(hisi_hba, phy_no, (phy_state & 1 << phy_no) ? 1 : 0);
+	hisi_sas_phy_down(hisi_hba, phy_no, (phy_state & 1 << phy_no) ? 1 : 0,
+			  GFP_ATOMIC);
 
 	sl_ctrl = hisi_sas_phy_read32(hisi_hba, phy_no, SL_CONTROL);
 	hisi_sas_phy_write32(hisi_hba, phy_no, SL_CONTROL,
@@ -2824,7 +2825,8 @@ static void phy_bcast_v2_hw(int phy_no, struct hisi_hba *hisi_hba)
 	bcast_status = hisi_sas_phy_read32(hisi_hba, phy_no, RX_PRIMS_STATUS);
 	if ((bcast_status & RX_BCAST_CHG_MSK) &&
 	    !test_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags))
-		sas_notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
+		sas_notify_port_event_gfp(sas_phy, PORTE_BROADCAST_RCVD,
+					  GFP_ATOMIC);
 	hisi_sas_phy_write32(hisi_hba, phy_no, CHL_INT0,
 			     CHL_INT0_SL_RX_BCST_ACK_MSK);
 	hisi_sas_phy_write32(hisi_hba, phy_no, SL_RX_BCAST_CHK_MSK, 0);

drivers/scsi/hisi_sas/hisi_sas_v3_hw.c

@@ -1575,7 +1575,8 @@ static irqreturn_t phy_down_v3_hw(int phy_no, struct hisi_hba *hisi_hba)
 
 	phy_state = hisi_sas_read32(hisi_hba, PHY_STATE);
 	dev_info(dev, "phydown: phy%d phy_state=0x%x\n", phy_no, phy_state);
-	hisi_sas_phy_down(hisi_hba, phy_no, (phy_state & 1 << phy_no) ? 1 : 0);
+	hisi_sas_phy_down(hisi_hba, phy_no, (phy_state & 1 << phy_no) ? 1 : 0,
+			  GFP_ATOMIC);
 
 	sl_ctrl = hisi_sas_phy_read32(hisi_hba, phy_no, SL_CONTROL);
 	hisi_sas_phy_write32(hisi_hba, phy_no, SL_CONTROL,
@@ -1601,7 +1602,8 @@ static irqreturn_t phy_bcast_v3_hw(int phy_no, struct hisi_hba *hisi_hba)
 	bcast_status = hisi_sas_phy_read32(hisi_hba, phy_no, RX_PRIMS_STATUS);
 	if ((bcast_status & RX_BCAST_CHG_MSK) &&
 	    !test_bit(HISI_SAS_RESET_BIT, &hisi_hba->flags))
-		sas_notify_port_event(sas_phy, PORTE_BROADCAST_RCVD);
+		sas_notify_port_event_gfp(sas_phy, PORTE_BROADCAST_RCVD,
+					  GFP_ATOMIC);
 	hisi_sas_phy_write32(hisi_hba, phy_no, CHL_INT0,
 			     CHL_INT0_SL_RX_BCST_ACK_MSK);
 	hisi_sas_phy_write32(hisi_hba, phy_no, SL_RX_BCAST_CHK_MSK, 0);