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()
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Alexey Kardashevskiy <aik@xxxxxxxxx>
---
arch/powerpc/include/asm/opal-api.h | 19 +++++-
arch/powerpc/include/asm/opal.h | 6 ++
arch/powerpc/include/asm/pnv-pci.h | 6 ++
arch/powerpc/platforms/powernv/opal-wrappers.S | 4 ++
arch/powerpc/platforms/powernv/pci.c | 82 ++++++++++++++++++++++++++
5 files changed, 116 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
index 9bb8ddf..2417c86 100644
--- a/arch/powerpc/include/asm/opal-api.h
+++ b/arch/powerpc/include/asm/opal-api.h
@@ -158,7 +158,11 @@
#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_LAST 121
/* Device tree flags */
@@ -344,6 +348,18 @@ 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,
+ OPAL_PCI_SLOT_OFFLINE = 2,
+ OPAL_PCI_SLOT_ONLINE = 3
+};
+
enum OpalSlotLedType {
OPAL_SLOT_LED_TYPE_ID = 0, /* IDENTIFY LED */
OPAL_SLOT_LED_TYPE_FAULT = 1, /* FAULT LED */
@@ -378,6 +394,7 @@ 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..fa71fea 100644
--- a/arch/powerpc/include/asm/opal.h
+++ b/arch/powerpc/include/asm/opal.h
@@ -209,6 +209,12 @@ 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 async_token, 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 810cc9a..791db1b 100644
--- a/arch/powerpc/include/asm/pnv-pci.h
+++ b/arch/powerpc/include/asm/pnv-pci.h
@@ -12,12 +12,18 @@
#include <linux/pci.h>
#include <misc/cxl-base.h>
+#include <asm/opal-api.h>
#define PCI_SLOT_ID_PREFIX 0x8000000000000000
#define PCI_SLOT_ID(phb_id, bdfn) \
(PCI_SLOT_ID_PREFIX | ((uint64_t)(bdfn) << 16) | (phb_id))
extern int pnv_pci_get_slot_id(struct device_node *np, uint64_t *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,
+ struct opal_msg *msg);
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,
diff --git a/arch/powerpc/platforms/powernv/opal-wrappers.S b/arch/powerpc/platforms/powernv/opal-wrappers.S
index e45b88a..3ea1a855 100644
--- a/arch/powerpc/platforms/powernv/opal-wrappers.S
+++ b/arch/powerpc/platforms/powernv/opal-wrappers.S
@@ -302,3 +302,7 @@ 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);
diff --git a/arch/powerpc/platforms/powernv/pci.c b/arch/powerpc/platforms/powernv/pci.c
index 2607d29..62c7637 100644
--- a/arch/powerpc/platforms/powernv/pci.c
+++ b/arch/powerpc/platforms/powernv/pci.c
@@ -74,6 +74,88 @@ int pnv_pci_get_slot_id(struct device_node *np, uint64_t *id)
}
EXPORT_SYMBOL_GPL(pnv_pci_get_slot_id);
+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 rc;
+}
+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, (uint64_t)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, (uint64_t)state);
+ if (rc != OPAL_SUCCESS)
+ return -EIO;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pnv_pci_get_power_state);
+
+int pnv_pci_set_power_state(uint64_t id, uint8_t state, struct opal_msg *msg)
+{
+ struct opal_msg m;
+ int token, ret;
+ int64_t rc;
+
+ if (!opal_check_token(OPAL_PCI_SET_POWER_STATE))
+ return -ENXIO;
+
+ token = opal_async_get_token_interruptible();
+ if (unlikely(token < 0))
+ return token;
+
+ rc = opal_pci_set_power_state(token, id, (uint64_t)&state);
+ if (rc == OPAL_SUCCESS) {
+ ret = 0;
+ goto exit;
+ } else if (rc != OPAL_ASYNC_COMPLETION) {
+ ret = -EIO;
+ goto exit;
+ }
+
+ ret = opal_async_wait_response(token, &m);
+ if (ret < 0)
+ goto exit;
+
+ if (msg) {
+ ret = 1;
+ memcpy(msg, &m, sizeof(m));
+ }
+
+exit:
+ opal_async_release_token(token);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(pnv_pci_set_power_state);
+
#ifdef CONFIG_PCI_MSI
int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
--
2.1.0
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