This exports 4 functions, 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@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
---
arch/powerpc/include/asm/opal-api.h | 18 ++++-
arch/powerpc/include/asm/opal.h | 5 ++
arch/powerpc/include/asm/pnv-pci.h | 7 ++
arch/powerpc/platforms/powernv/opal-wrappers.S | 5 ++
arch/powerpc/platforms/powernv/pci.c | 102 +++++++++++++++++++++++++
5 files changed, 136 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 9bb8ddf..728e04e 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -158,7 +158,12 @@
#define OPAL_LEDS_SET_INDICATOR 115
#define OPAL_CEC_REBOOT2 116
#define OPAL_CONSOLE_FLUSH 117
-#define OPAL_LAST 117
+#define OPAL_GET_DEVICE_TREE 118
+#define OPAL_PCI_GET_PRESENCE_STATE 119
+#define OPAL_PCI_GET_POWER_STATE 120
+#define OPAL_PCI_SET_POWER_STATE 121
+#define OPAL_PCI_POLL2 122
+#define OPAL_LAST 122
/* Device tree flags */
@@ -344,6 +349,16 @@ 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 */
@@ -378,6 +393,7 @@ enum opal_msg_type {
OPAL_MSG_DPO = 5,
OPAL_MSG_PRD = 6,
OPAL_MSG_OCC = 7,
+ OPAL_MSG_PCI_HOTPLUG = 8,
OPAL_MSG_TYPE_MAX,
};
diff --git a/arch/powerpc/include/asm/opal.h b/arch/powerpc/include/asm/opal.h
index 348132c..1a83c80 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -209,6 +209,11 @@ 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, uint64_t data);
+int64_t opal_pci_get_power_state(uint64_t id, uint64_t data);
+int64_t opal_pci_set_power_state(uint64_t id, uint64_t data);
+int64_t opal_pci_poll2(uint64_t id, uint64_t data);
/* 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 c607902..8db7439 100644
--- a/arch/powerpc/include/asm/pnv-pci.h
+++ b/arch/powerpc/include/asm/pnv-pci.h
@@ -17,6 +17,13 @@
#define PCI_SLOT_ID(phb_id, bdfn) \
(PCI_SLOT_ID_PREFIX | ((uint64_t)(bdfn) << 16) | (phb_id))
+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 e45b88a..60397d2 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -302,3 +302,8 @@ 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_console_flush, OPAL_CONSOLE_FLUSH);
+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);
+OPAL_CALL(opal_pci_poll2, OPAL_PCI_POLL2);
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index 67a33e9..6e10ac4 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -42,6 +42,108 @@
#define cfg_dbg(fmt...) do { } while(0)
//#define cfg_dbg(fmt...) printk(fmt)
+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);
+
+static int pnv_pci_poll2(uint64_t id, uint8_t *state)
+{
+ int64_t rc;
+
+ if (!opal_check_token(OPAL_PCI_POLL2))
+ return -ENXIO;
+
+ while (1) {
+ rc = opal_pci_poll2(id, (uint64_t)state);
+ if (rc <= OPAL_SUCCESS)
+ break;
+
+ if (system_state < SYSTEM_RUNNING)
+ udelay(1000 * rc);
+ else
+ msleep(rc);
+ }
+
+ if (rc != OPAL_SUCCESS)
+ return -EIO;
+
+ return 0;
+}
+
+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, (uint64_t)state);
+ if (rc == OPAL_SUCCESS)
+ return 0;
+ else if (rc < OPAL_SUCCESS)
+ return -EIO;
+
+ return pnv_pci_poll2(id, state);
+}
+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, (uint64_t)state);
+ if (rc == OPAL_SUCCESS)
+ return 0;
+ else if (rc < OPAL_SUCCESS)
+ return -EIO;
+
+ return pnv_pci_poll2(id, 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, (uint64_t)&state);
+ if (rc == OPAL_SUCCESS)
+ return 0;
+ else if (rc < OPAL_SUCCESS)
+ return -EIO;
+
+ return pnv_pci_poll2(id, &state);
+}
+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
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