[PATCH v2 20/27] nvdimm/ocxl: Add an IOCTL to request controller health & perf data

From: "Alastair D'Silva" <alastair@au1.ibm.com>
To: alastair@d-silva.org
Cc: "Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	"Paul Mackerras" <paulus@samba.org>,
	"Michael Ellerman" <mpe@ellerman.id.au>,
	"Frederic Barrat" <fbarrat@linux.ibm.com>,
	"Andrew Donnellan" <ajd@linux.ibm.com>,
	"Arnd Bergmann" <arnd@arndb.de>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Mauro Carvalho Chehab" <mchehab+samsung@kernel.org>,
	"David S. Miller" <davem@davemloft.net>,
	"Rob Herring" <robh@kernel.org>,
	"Anton Blanchard" <anton@ozlabs.org>,
	"Krzysztof Kozlowski" <krzk@kernel.org>,
	"Mahesh Salgaonkar" <mahesh@linux.vnet.ibm.com>,
	"Madhavan Srinivasan" <maddy@linux.vnet.ibm.com>,
	"Cédric Le Goater" <clg@kaod.org>,
	"Anju T Sudhakar" <anju@linux.vnet.ibm.com>,
	"Hari Bathini" <hbathini@linux.ibm.com>,
	"Thomas Gleixner" <tglx@linutronix.de>,
	"Greg Kurz" <groug@kaod.org>,
	"Nicholas Piggin" <npiggin@gmail.com>,
	"Masahiro Yamada" <yamada.masahiro@socionext.com>,
	"Alexey Kardashevskiy" <aik@ozlabs.ru>,
	linux-kernel@vger.kernel.org, linuxppc-dev@list
Subject: [PATCH v2 20/27] nvdimm/ocxl: Add an IOCTL to request controller health & perf data
Date: Tue,  3 Dec 2019 14:46:48 +1100
Message-ID: <20191203034655.51561-21-alastair@au1.ibm.com> (raw)
In-Reply-To: <20191203034655.51561-1-alastair@au1.ibm.com>

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>
---
 drivers/nvdimm/ocxl/scm.c      | 16 ++++++++++++++++
 include/uapi/nvdimm/ocxl-scm.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/nvdimm/ocxl/scm.c b/drivers/nvdimm/ocxl/scm.c
index 854787950334..d482b3213a02 100644
--- a/drivers/nvdimm/ocxl/scm.c
+++ b/drivers/nvdimm/ocxl/scm.c
@@ -1048,6 +1048,18 @@ static int scm_ioctl_event_check(struct scm_data *scm_data, u64 __user *uarg)
 	return rc;
 }
 
+/**
+ * scm_req_controller_health_perf() - Request controller health & performance data
+ * @scm_data: the SCM metadata
+ * Return: 0 on success, negative on failure
+ */
+int scm_req_controller_health_perf(struct scm_data *scm_data)
+{
+	return ocxl_global_mmio_set64(scm_data->ocxl_afu, GLOBAL_MMIO_HCI,
+				      OCXL_LITTLE_ENDIAN,
+				      GLOBAL_MMIO_HCI_REQ_HEALTH_PERF);
+}
+
 static long scm_file_ioctl(struct file *file, unsigned int cmd,
 			   unsigned long args)
 {
@@ -1086,6 +1098,10 @@ static long scm_file_ioctl(struct file *file, unsigned int cmd,
 	case SCM_IOCTL_EVENT_CHECK:
 		rc = scm_ioctl_event_check(scm_data, (u64 __user *)args);
 		break;
+
+	case SCM_IOCTL_REQUEST_HEALTH:
+		rc = scm_req_controller_health_perf(scm_data);
+		break;
 	}
 
 	return rc;
diff --git a/include/uapi/nvdimm/ocxl-scm.h b/include/uapi/nvdimm/ocxl-scm.h
index e86ffb02d31f..55a7ad59d614 100644
--- a/include/uapi/nvdimm/ocxl-scm.h
+++ b/include/uapi/nvdimm/ocxl-scm.h
@@ -90,5 +90,6 @@ struct scm_ioctl_eventfd {
 #define SCM_IOCTL_CONTROLLER_STATS _IO(SCM_MAGIC, 0x05)
 #define SCM_IOCTL_EVENTFD	_IOW(SCM_MAGIC, 0x06, struct scm_ioctl_eventfd)
 #define SCM_IOCTL_EVENT_CHECK	_IOR(SCM_MAGIC, 0x07, __u64)
+#define SCM_IOCTL_REQUEST_HEALTH _IO(SCM_MAGIC, 0x08)
 
 #endif /* _UAPI_OCXL_SCM_H */
-- 
2.23.0
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