[PATCH v7 42/50] powerpc/powernv: Functions to get/set PCI slot status

Gavin Shan
2015-11-04T13:13:57Z

This exports 4 functins, which base on the corresponding OPAL
APIs to get/set PCI slot status. Those functions are going to
be used by PowerNV PCI hotplug driver:

pnv_pci_get_device_tree() opal_get_device_tree()
pnv_pci_get_presence_state() opal_pci_get_presence_state()
pnv_pci_get_power_state() opal_pci_get_power_state()
pnv_pci_set_power_state() opal_pci_set_power_state()

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 in PowerNV PCI hotplug driver.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/opal-api.h | 17 ++++++-
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, 97 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 8374afe..fe3e458 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -157,7 +157,11 @@
#define OPAL_LEDS_GET_INDICATOR 114
#define OPAL_LEDS_SET_INDICATOR 115
#define OPAL_CEC_REBOOT2 116
-#define OPAL_LAST 116
+#define OPAL_GET_DEVICE_TREE 117
+#define OPAL_PCI_GET_PRESENCE_STATE 118
+#define OPAL_PCI_GET_POWER_STATE 119
+#define OPAL_PCI_SET_POWER_STATE 120
+#define OPAL_LAST 120

/* Device tree flags */

@@ -343,6 +347,16 @@ enum OpalPciResetState {
OPAL_ASSERT_RESET = 1
};

+enum OpalPciSlotPresentenceState {
+ OPAL_PCI_SLOT_EMPTY = 0,
+ OPAL_PCI_SLOT_PRESENT = 1
+};
+
+enum OpalPciSlotPowerState {
+ OPAL_PCI_SLOT_POWER_OFF = 0,
+ OPAL_PCI_SLOT_POWER_ON = 1
+};
+
enum OpalSlotLedType {
OPAL_SLOT_LED_TYPE_ID = 0, /* IDENTIFY LED */
OPAL_SLOT_LED_TYPE_FAULT = 1, /* FAULT LED */
@@ -377,6 +391,7 @@ enum opal_msg_type {
OPAL_MSG_DPO,
OPAL_MSG_PRD,
OPAL_MSG_OCC,
+ 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 11ee20e..47f200e 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -208,6 +208,10 @@ 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_device_tree(uint32_t phandle, uint64_t buf, uint64_t len);
+int64_t opal_pci_get_presence_state(uint64_t id, uint8_t *state);
+int64_t opal_pci_get_power_state(uint64_t id, uint8_t *state);
+int64_t opal_pci_set_power_state(uint64_t id, uint8_t state);

/* 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 6f77f71..d9d095b 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-base.h>

+extern int pnv_pci_get_device_tree(uint32_t phandle, void *buf, uint64_t len);
+extern int pnv_pci_get_presence_state(uint64_t id, uint8_t *state);
+extern int pnv_pci_get_power_state(uint64_t id, uint8_t *state);
+extern int pnv_pci_set_power_state(uint64_t id, uint8_t state);
+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 b7a464f..55f1fd4 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -301,3 +301,7 @@ OPAL_CALL(opal_flash_erase, OPAL_FLASH_ERASE);
OPAL_CALL(opal_prd_msg, OPAL_PRD_MSG);
OPAL_CALL(opal_leds_get_ind, OPAL_LEDS_GET_INDICATOR);
OPAL_CALL(opal_leds_set_ind, OPAL_LEDS_SET_INDICATOR);
+OPAL_CALL(opal_get_device_tree, OPAL_GET_DEVICE_TREE);
+OPAL_CALL(opal_pci_get_presence_state, OPAL_PCI_GET_PRESENCE_STATE);
+OPAL_CALL(opal_pci_get_power_state, OPAL_PCI_GET_POWER_STATE);
+OPAL_CALL(opal_pci_set_power_state, OPAL_PCI_SET_POWER_STATE);
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index ae0f0c1..71c648e 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 *state)
return (rval == OPAL_SUCCESS) ? 0 : -EIO;
}

+int pnv_pci_get_device_tree(uint32_t phandle, void *buf, uint64_t len)
+{
+ int64_t rc;
+
+ if (!opal_check_token(OPAL_GET_DEVICE_TREE))
+ return -ENXIO;
+
+ rc = opal_get_device_tree(phandle, (uint64_t)buf, len);
+ if (rc != OPAL_SUCCESS)
+ return -EIO;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pnv_pci_get_device_tree);
+
+int pnv_pci_get_presence_state(uint64_t id, uint8_t *state)
+{
+ int64_t rc;
+
+ if (!opal_check_token(OPAL_PCI_GET_PRESENCE_STATE))
+ return -ENXIO;
+
+ rc = opal_pci_get_presence_state(id, state);
+ if (rc != OPAL_SUCCESS)
+ return -EIO;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pnv_pci_get_presence_state);
+
+int pnv_pci_get_power_state(uint64_t id, uint8_t *state)
+{
+ int64_t rc;
+
+ if (!opal_check_token(OPAL_PCI_GET_POWER_STATE))
+ return -ENXIO;
+
+ rc = opal_pci_get_power_state(id, state);
+ return pnv_pci_poll(id, rc, state);
+}
+EXPORT_SYMBOL_GPL(pnv_pci_get_power_state);
+
+int pnv_pci_set_power_state(uint64_t id, uint8_t state)
+{
+ int64_t rc;
+
+ if (!opal_check_token(OPAL_PCI_SET_POWER_STATE))
+ return -ENXIO;
+
+ rc = opal_pci_set_power_state(id, state);
+ return pnv_pci_poll(id, rc, NULL);
+}
+EXPORT_SYMBOL_GPL(pnv_pci_set_power_state);
+
+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
int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
--
2.1.0