[PATCH 4/5] powerpc/powernv: Functions to retrieve PCI slot status

[Gavin Shan]

The patch exports two functions, which base on corresponding OPAL
APIs to retrieve PCI slot status. Those functions are going to be
used by PCI hotplug module in subsequent patches:

   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 at linux.vnet.ibm.com>
---
 arch/powerpc/include/asm/opal.h                |  4 ++++
 arch/powerpc/include/asm/pnv-pci.h             |  3 +++
 arch/powerpc/platforms/powernv/opal-wrappers.S |  2 ++
 arch/powerpc/platforms/powernv/pci.c           | 24 ++++++++++++++++++++++++
 4 files changed, 33 insertions(+)

diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index edd1993..c17fe80 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -154,6 +154,8 @@ 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__
 
@@ -958,6 +960,8 @@ 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..fc73f72 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(uint64_t id, uint8_t *status);
+extern int pnv_pci_get_presence_status(uint64_t id, uint8_t *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/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index feb549a..bc5be98 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -250,3 +250,5 @@ 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 6dc8ea9..d3af9e5 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -64,6 +64,30 @@ int pnv_pci_poll(uint64_t id, int64_t rval, uint8_t *pval)
 	return rval ? -EIO : 0;
 }
 
+int pnv_pci_get_power_status(uint64_t id, uint8_t *status)
+{
+	long rc;
+
+	if (!opal_check_token(OPAL_PCI_GET_POWER_STATUS))
+		return -ENXIO;
+
+	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(uint64_t id, uint8_t *status)
+{
+	long rc;
+
+	if (!opal_check_token(OPAL_PCI_GET_PRESENCE_STATUS))
+		return -ENXIO;
+
+	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)
 {
-- 
1.8.3.2