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Subject[PATCH v3 21/27] powerpc/powernv/pmem: Add an IOCTL to request controller health & perf data
Date
From: Alastair D'Silva <alastair@d-silva.org>

When health & performance data is requested from the controller,
it responds with an error log containing the requested information.

This patch allows the request to me issued via an IOCTL.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
---
arch/powerpc/platforms/powernv/pmem/ocxl.c | 16 ++++++++++++++++
include/uapi/nvdimm/ocxl-pmem.h | 1 +
2 files changed, 17 insertions(+)

diff --git a/arch/powerpc/platforms/powernv/pmem/ocxl.c b/arch/powerpc/platforms/powernv/pmem/ocxl.c
index e46696d3cc36..081883a8247a 100644
--- a/arch/powerpc/platforms/powernv/pmem/ocxl.c
+++ b/arch/powerpc/platforms/powernv/pmem/ocxl.c
@@ -1000,6 +1000,18 @@ static int ioctl_event_check(struct ocxlpmem *ocxlpmem, u64 __user *uarg)
return rc;
}

+/**
+ * req_controller_health_perf() - Request controller health & performance data
+ * @ocxlpmem: the device metadata
+ * Return: 0 on success, negative on failure
+ */
+int req_controller_health_perf(struct ocxlpmem *ocxlpmem)
+{
+ return ocxl_global_mmio_set64(ocxlpmem->ocxl_afu, GLOBAL_MMIO_HCI,
+ OCXL_LITTLE_ENDIAN,
+ GLOBAL_MMIO_HCI_REQ_HEALTH_PERF);
+}
+
static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
{
struct ocxlpmem *ocxlpmem = file->private_data;
@@ -1037,6 +1049,10 @@ static long file_ioctl(struct file *file, unsigned int cmd, unsigned long args)
case IOCTL_OCXL_PMEM_EVENT_CHECK:
rc = ioctl_event_check(ocxlpmem, (u64 __user *)args);
break;
+
+ case IOCTL_OCXL_PMEM_REQUEST_HEALTH:
+ rc = req_controller_health_perf(ocxlpmem);
+ break;
}

return rc;
diff --git a/include/uapi/nvdimm/ocxl-pmem.h b/include/uapi/nvdimm/ocxl-pmem.h
index 988eb0bc413d..0d03abb44001 100644
--- a/include/uapi/nvdimm/ocxl-pmem.h
+++ b/include/uapi/nvdimm/ocxl-pmem.h
@@ -90,5 +90,6 @@ struct ioctl_ocxl_pmem_eventfd {
#define IOCTL_OCXL_PMEM_CONTROLLER_STATS _IO(OCXL_PMEM_MAGIC, 0x05)
#define IOCTL_OCXL_PMEM_EVENTFD _IOW(OCXL_PMEM_MAGIC, 0x06, struct ioctl_ocxl_pmem_eventfd)
#define IOCTL_OCXL_PMEM_EVENT_CHECK _IOR(OCXL_PMEM_MAGIC, 0x07, __u64)
+#define IOCTL_OCXL_PMEM_REQUEST_HEALTH _IO(OCXL_PMEM_MAGIC, 0x08)

#endif /* _UAPI_OCXL_SCM_H */
--
2.24.1
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