[PATCH v4 13/21] powerpc/powernv: Introduce pnv_pci_poll()

[Gavin Shan <gwshan@linux.vnet.ibm.com>]

We might not get some PCI slot information (e.g. power status)
immediately by OPAL API. Instead, opal_pci_poll() need to be called
for the required information.

The patch introduces pnv_pci_poll(), which bases on original
pnv_eeh_poll(), to cover the above case

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
---
 arch/powerpc/platforms/powernv/eeh-powernv.c | 28 ++--------------------------
 arch/powerpc/platforms/powernv/pci.c         | 16 ++++++++++++++++
 arch/powerpc/platforms/powernv/pci.h         |  1 +
 3 files changed, 19 insertions(+), 26 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/eeh-powernv.c b/arch/powerpc/platforms/powernv/eeh-powernv.c
index 58e4dcf..9253b9e 100644
--- a/arch/powerpc/platforms/powernv/eeh-powernv.c
+++ b/arch/powerpc/platforms/powernv/eeh-powernv.c
@@ -742,24 +742,6 @@ static int pnv_eeh_get_state(struct eeh_pe *pe, int *delay)
 	return ret;
 }
 
-static s64 pnv_eeh_poll(uint64_t id)
-{
-	s64 rc = OPAL_HARDWARE;
-
-	while (1) {
-		rc = opal_pci_poll(id, NULL);
-		if (rc <= 0)
-			break;
-
-		if (system_state < SYSTEM_RUNNING)
-			udelay(1000 * rc);
-		else
-			msleep(rc);
-	}
-
-	return rc;
-}
-
 int pnv_eeh_phb_reset(struct pci_controller *hose, int option)
 {
 	struct pnv_phb *phb = hose->private_data;
@@ -788,10 +770,7 @@ int pnv_eeh_phb_reset(struct pci_controller *hose, int option)
 
 	/* Issue reset and poll until it's completed */
 	rc = opal_pci_reset(phb->opal_id, scope, OPAL_ASSERT_RESET);
-	if (rc > 0)
-		rc = pnv_eeh_poll(phb->opal_id);
-
-	return (rc == OPAL_SUCCESS) ? 0 : -EIO;
+	return pnv_pci_poll(phb->opal_id, rc, NULL);
 }
 
 static int __pnv_eeh_bridge_reset(struct pci_dev *dev, int option)
@@ -882,10 +861,7 @@ static int pnv_eeh_bridge_reset(struct pci_dev *dev, int option)
 	phb = hose->private_data;
 	id |= (dev->bus->number << 24) | (dev->devfn << 16) | phb->opal_id;
 	rc = opal_pci_reset(id, scope, OPAL_ASSERT_RESET);
-	if (rc > 0)
-		rc = pnv_eeh_poll(id);
-
-	return (rc == OPAL_SUCCESS) ? 0 : -EIO;
+	return pnv_pci_poll(id, rc, NULL);
 }
 
 static int pnv_pci_dev_reset_type(struct pci_dev *pdev, void *data)
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index bca2aeb..a2da9a3 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -44,6 +44,22 @@
 #define cfg_dbg(fmt...)	do { } while(0)
 //#define cfg_dbg(fmt...)	printk(fmt)
 
+int pnv_pci_poll(uint64_t id, int64_t rval, uint8_t *pval)
+{
+	while (rval > 0) {
+		if (system_state < SYSTEM_RUNNING)
+			udelay(1000 * rval);
+		else
+			msleep(rval);
+
+		rval = opal_pci_poll(id, pval);
+		if (rval == OPAL_SUCCESS && pval)
+			rval = opal_pci_poll(id, pval);
+	}
+
+	return rval ? -EIO : 0;
+}
+
 #ifdef CONFIG_PCI_MSI
 static int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 {
diff --git a/arch/powerpc/platforms/powernv/pci.h b/arch/powerpc/platforms/powernv/pci.h
index 8b10f01..82c5539 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -202,6 +202,7 @@ struct pnv_phb {
 
 extern struct pci_ops pnv_pci_ops;
 
+int pnv_pci_poll(uint64_t id, int64_t rval, uint8_t *pval);
 void pnv_pci_dump_phb_diag_data(struct pci_controller *hose,
 				unsigned char *log_buff);
 int pnv_pci_cfg_read(struct pci_dn *pdn,
-- 
2.1.0