The patch exports 4 functions, which base on corresponding OPAL
APIs to get or set PCI slot status. Those functions are going to
be used by PCI hotplug module in subsequent patches:
pnv_pci_get_overlay_dt() opal_get_overlay_dt()
pnv_pci_get_presence_status() opal_pci_get_presence_status()
pnv_pci_get_power_status() opal_pci_get_power_status()
pnv_pci_set_power_status() opal_pci_set_power_status()
Besides, the patch also exports pnv_pci_hotplug_notifier_{register,
unregister}() to allow registration and unregistration of PCI hotplug
notifier, which will be used to receive PCI hotplug message from skiboot
firmware.
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
---
v5:
* Derived from PATCH[v4 14/21]
* No polling required for pnv_pci_get_presence_status()
* Separate functions for registration and unregistration of PCI
hotplug notifier
* int64_t for value returned from OPAL API
---
arch/powerpc/include/asm/opal-api.h | 8 +++-
arch/powerpc/include/asm/opal.h | 4 ++
arch/powerpc/include/asm/pnv-pci.h | 7 +++
arch/powerpc/platforms/powernv/opal-wrappers.S | 4 ++
arch/powerpc/platforms/powernv/pci.c | 66 ++++++++++++++++++++++++++
5 files changed, 88 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 0321a90..c534dd8 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -153,7 +153,11 @@
#define OPAL_FLASH_READ 110
#define OPAL_FLASH_WRITE 111
#define OPAL_FLASH_ERASE 112
-#define OPAL_LAST 112
+#define OPAL_GET_OVERLAY_DT 116
+#define OPAL_PCI_GET_PRESENCE_STATUS 117
+#define OPAL_PCI_GET_POWER_STATUS 118
+#define OPAL_PCI_SET_POWER_STATUS 119
+#define OPAL_LAST 119
/* Device tree flags */
@@ -352,6 +356,8 @@ enum opal_msg_type {
OPAL_MSG_SHUTDOWN, /* params[0] = 1 reboot, 0 shutdown */
OPAL_MSG_HMI_EVT,
OPAL_MSG_DPO,
+ OPAL_MSG_PRD,
+ OPAL_MSG_PCI_HOTPLUG,
OPAL_MSG_TYPE_MAX,
};
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 6d467df..2d1c825 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -200,6 +200,10 @@ int64_t opal_flash_write(uint64_t id, uint64_t offset, uint64_t buf,
uint64_t size, uint64_t token);
int64_t opal_flash_erase(uint64_t id, uint64_t offset, uint64_t size,
uint64_t token);
+int64_t opal_get_overlay_dt(uint64_t *counter, void *buf, uint64_t len);
+int64_t opal_pci_get_presence_status(uint64_t id, uint8_t *status);
+int64_t opal_pci_get_power_status(uint64_t id, uint8_t *status);
+int64_t opal_pci_set_power_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 f9b4982..9f63375 100644
--- a/arch/powerpc/include/asm/pnv-pci.h
+++ b/arch/powerpc/include/asm/pnv-pci.h
@@ -13,6 +13,13 @@
#include <linux/pci.h>
#include <misc/cxl.h>
+extern int pnv_pci_get_overlay_dt(uint64_t *counter, void *buf, uint64_t len);
+extern int pnv_pci_get_presence_status(uint64_t id, uint8_t *status);
+extern int pnv_pci_get_power_status(uint64_t id, uint8_t *status);
+extern int pnv_pci_set_power_status(uint64_t id, uint8_t status);
+extern int pnv_pci_hotplug_notifier_register(struct notifier_block *nb);
+extern int pnv_pci_hotplug_notifier_unregister(struct notifier_block *nb);
+
int pnv_phb_to_cxl_mode(struct pci_dev *dev, uint64_t mode);
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 a7ade94..1d87c30 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -295,3 +295,7 @@ OPAL_CALL(opal_i2c_request, OPAL_I2C_REQUEST);
OPAL_CALL(opal_flash_read, OPAL_FLASH_READ);
OPAL_CALL(opal_flash_write, OPAL_FLASH_WRITE);
OPAL_CALL(opal_flash_erase, OPAL_FLASH_ERASE);
+OPAL_CALL(opal_get_overlay_dt, OPAL_GET_OVERLAY_DT);
+OPAL_CALL(opal_pci_get_presence_status, OPAL_PCI_GET_PRESENCE_STATUS);
+OPAL_CALL(opal_pci_get_power_status, OPAL_PCI_GET_POWER_STATUS);
+OPAL_CALL(opal_pci_set_power_status, OPAL_PCI_SET_POWER_STATUS);
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index bf5df04..c332ea7 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -65,6 +65,72 @@ int pnv_pci_poll(uint64_t id, int64_t rval, uint8_t *pval)
return rval ? -EIO : 0;
}
+int pnv_pci_get_overlay_dt(uint64_t *counter, void *buf, uint64_t len)
+{
+ int64_t rc;
+
+ if (!opal_check_token(OPAL_GET_OVERLAY_DT))
+ return -ENXIO;
+
+ rc = opal_get_overlay_dt(counter, buf, len);
+ if (rc != OPAL_SUCCESS)
+ return -EIO;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pnv_pci_get_overlay_dt);
+
+int pnv_pci_get_presence_status(uint64_t id, uint8_t *status)
+{
+ int64_t rc;
+
+ if (!opal_check_token(OPAL_PCI_GET_PRESENCE_STATUS))
+ return -ENXIO;
+
+ rc = opal_pci_get_presence_status(id, status);
+ if (rc != OPAL_SUCCESS)
+ return -EIO;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pnv_pci_get_presence_status);
+
+int pnv_pci_get_power_status(uint64_t id, uint8_t *status)
+{
+ int64_t 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_set_power_status(uint64_t id, uint8_t status)
+{
+ int64_t rc;
+
+ if (!opal_check_token(OPAL_PCI_SET_POWER_STATUS))
+ return -ENXIO;
+
+ rc = opal_pci_set_power_status(id, status);
+ return pnv_pci_poll(id, rc, NULL);
+}
+EXPORT_SYMBOL_GPL(pnv_pci_set_power_status);
+
+int pnv_pci_hotplug_notifier_register(struct notifier_block *nb)
+{
+ return opal_message_notifier_register(OPAL_MSG_PCI_HOTPLUG, nb);
+}
+EXPORT_SYMBOL_GPL(pnv_pci_hotplug_notifier_register);
+
+int pnv_pci_hotplug_notifier_unregister(struct notifier_block *nb)
+{
+ return opal_message_notifier_unregister(OPAL_MSG_PCI_HOTPLUG, nb);
+}
+EXPORT_SYMBOL_GPL(pnv_pci_hotplug_notifier_unregister);
+
#ifdef CONFIG_PCI_MSI
static int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
--
2.1.0
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