[PATCH 3/8] powerpc/powernv: Export functions to retrieve slot status

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The patch exports two functions, which base on corresponding OPAL
APIs to retrieve PCI slot status:

   pnv_pci_get_power_status()     opal_pci_get_power_status()
   pnv_pci_get_presence_status()  opal_pci_get_presence_status()

Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
 arch/powerpc/include/asm/opal.h                |  6 +++-
 arch/powerpc/include/asm/pnv-pci.h             |  3 ++
 arch/powerpc/platforms/powernv/eeh-ioda.c      | 34 ++---------------------
 arch/powerpc/platforms/powernv/opal-wrappers.S |  2 ++
 arch/powerpc/platforms/powernv/pci.c           | 38 ++++++++++++++++++++++++++
 arch/powerpc/platforms/powernv/pci.h           |  1 +
 6 files changed, 51 insertions(+), 33 deletions(-)

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index b59811f..b75be1c 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -153,6 +153,8 @@ struct opal_sg_list {
 #define OPAL_HANDLE_HMI				98
 #define OPAL_REGISTER_DUMP_REGION		101
 #define OPAL_UNREGISTER_DUMP_REGION		102
+#define OPAL_PCI_GET_POWER_STATUS		110
+#define OPAL_PCI_GET_PRESENCE_STATUS		111
 
 #ifndef __ASSEMBLY__
 
@@ -905,7 +907,7 @@ int64_t opal_get_epow_status(__be64 *status);
 int64_t opal_set_system_attention_led(uint8_t led_action);
 int64_t opal_pci_next_error(uint64_t phb_id, __be64 *first_frozen_pe,
 			    __be16 *pci_error_type, __be16 *severity);
-int64_t opal_pci_poll(uint64_t id);
+int64_t opal_pci_poll(uint64_t id, uint8_t *val);
 int64_t opal_return_cpu(void);
 int64_t opal_check_token(uint64_t token);
 int64_t opal_reinit_cpus(uint64_t flags);
@@ -946,6 +948,8 @@ int64_t opal_handle_hmi(void);
 int64_t opal_register_dump_region(uint32_t id, uint64_t start, uint64_t end);
 int64_t opal_unregister_dump_region(uint32_t id);
 int64_t opal_pci_set_phb_cxl_mode(uint64_t phb_id, uint64_t mode, uint64_t pe_number);
+int64_t opal_pci_get_power_status(uint64_t id, uint8_t *status);
+int64_t opal_pci_get_presence_status(uint64_t id, uint8_t *status);
 
 /* Internal functions */
 extern int early_init_dt_scan_opal(unsigned long node, const char *uname,
diff --git a/arch/powerpc/include/asm/pnv-pci.h b/arch/powerpc/include/asm/pnv-pci.h
index f09a22f..527d97a 100644
--- a/arch/powerpc/include/asm/pnv-pci.h
+++ b/arch/powerpc/include/asm/pnv-pci.h
@@ -13,6 +13,9 @@
 #include <linux/pci.h>
 #include <misc/cxl.h>
 
+extern int pnv_pci_get_power_status(unsigned int index, unsigned char *status);
+extern int pnv_pci_get_presence_status(unsigned int index, unsigned char *status);
+
 int pnv_phb_to_cxl(struct pci_dev *dev);
 int pnv_cxl_ioda_msi_setup(struct pci_dev *dev, unsigned int hwirq,
 			   unsigned int virq);
diff --git a/arch/powerpc/platforms/powernv/eeh-ioda.c b/arch/powerpc/platforms/powernv/eeh-ioda.c
index 4bf2fb5..fb66c74 100644
--- a/arch/powerpc/platforms/powernv/eeh-ioda.c
+++ b/arch/powerpc/platforms/powernv/eeh-ioda.c
@@ -490,24 +490,6 @@ static int ioda_eeh_get_state(struct eeh_pe *pe)
 	return ioda_eeh_get_pe_state(pe);
 }
 
-static s64 ioda_eeh_phb_poll(uint64_t id)
-{
-	s64 rc = OPAL_HARDWARE;
-
-	while (1) {
-		rc = opal_pci_poll(id);
-		if (rc <= 0)
-			break;
-
-		if (system_state < SYSTEM_RUNNING)
-			udelay(1000 * rc);
-		else
-			msleep(rc);
-	}
-
-	return rc;
-}
-
 int ioda_eeh_phb_reset(struct pci_controller *hose, int option)
 {
 	struct pnv_phb *phb = hose->private_data;
@@ -542,13 +524,7 @@ int ioda_eeh_phb_reset(struct pci_controller *hose, int option)
 	 * need the PCI bus settlement delay.
 	 */
 	rc = opal_pci_reset(phb->opal_id, reset_scope);
-	if (rc > 0)
-		rc = ioda_eeh_phb_poll(phb->opal_id);
-
-	if (rc != OPAL_SUCCESS)
-		return -EIO;
-
-	return 0;
+	return pnv_pci_poll(phb->opal_id, rc, NULL);
 }
 
 static int __ioda_eeh_bridge_reset(struct pci_dev *dev, int option)
@@ -641,13 +617,7 @@ static int ioda_eeh_bridge_reset(struct pci_dev *dev, int option)
 	phb = hose->private_data;
 	id |= ((phb->opal_id << 16) | (dev->bus->number << 8) | (dev->devfn));
 	rc = opal_pci_reset(id, reset_scope);
-	if (rc > 0)
-		rc = ioda_eeh_phb_poll(id);
-
-	if (rc != OPAL_SUCCESS)
-		return -EIO;
-
-	return 0;
+	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/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index b6474a1..b2c15ff 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -249,3 +249,5 @@ OPAL_CALL(opal_handle_hmi,			OPAL_HANDLE_HMI);
 OPAL_CALL(opal_register_dump_region,		OPAL_REGISTER_DUMP_REGION);
 OPAL_CALL(opal_unregister_dump_region,		OPAL_UNREGISTER_DUMP_REGION);
 OPAL_CALL(opal_pci_set_phb_cxl_mode,		OPAL_PCI_SET_PHB_CXL_MODE);
+OPAL_CALL(opal_pci_get_power_status,		OPAL_PCI_GET_POWER_STATUS);
+OPAL_CALL(opal_pci_get_presence_status,		OPAL_PCI_GET_PRESENCE_STATUS);
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index b2187d0..f5bae4f 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -45,6 +45,44 @@
 #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) {
+		rval = opal_pci_poll(id, pval);
+		if (rval <= 0)
+			break;
+
+		if (system_state < SYSTEM_RUNNING)
+			udelay(1000 * rval);
+		else
+			msleep(rval);
+	}
+
+	return rval ? -EIO : 0;
+}
+
+int pnv_pci_get_power_status(unsigned int index, unsigned char *status)
+{
+	uint64_t id = (0x1ul << 63);
+	long rc;
+
+	id |= index;
+	rc = opal_pci_get_power_status(id, status);
+	return pnv_pci_poll(id, rc, status);
+}
+EXPORT_SYMBOL_GPL(pnv_pci_get_power_status);
+
+int pnv_pci_get_presence_status(unsigned int index, unsigned char *status)
+{
+	uint64_t id = (0x1ul << 63);
+	long rc;
+
+	id |= index;
+	rc = opal_pci_get_presence_status(id, status);
+	return pnv_pci_poll(id, rc, status);
+}
+EXPORT_SYMBOL_GPL(pnv_pci_get_presence_status);
+
 #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 6c02ff8..396fe02 100644
--- a/arch/powerpc/platforms/powernv/pci.h
+++ b/arch/powerpc/platforms/powernv/pci.h
@@ -217,6 +217,7 @@ extern struct pci_ops pnv_pci_ops;
 extern struct pnv_eeh_ops ioda_eeh_ops;
 #endif
 
+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 device_node *dn,
-- 
1.8.3.2

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