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

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Date:   Tue,  3 Dec 2019 14:46:48 +1100
From:   "Alastair D'Silva" <alastair@....ibm.com>
To:     alastair@...ilva.org
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Andrew Donnellan <ajd@...ux.ibm.com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh@...nel.org>,
        Anton Blanchard <anton@...abs.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Cédric Le Goater <clg@...d.org>,
        Anju T Sudhakar <anju@...ux.vnet.ibm.com>,
        Hari Bathini <hbathini@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Greg Kurz <groug@...d.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Alexey Kardashevskiy <aik@...abs.ru>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-nvdimm@...ts.01.org, linux-mm@...ck.org
Subject: [PATCH v2 20/27] nvdimm/ocxl: Add an IOCTL to request controller health & perf data

From: Alastair D'Silva <alastair@...ilva.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@...ilva.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