linux-kernel - [RFC PATCH 14/14] WIP/cxl/mem: Add get firmware for testing

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Date:   Tue,  8 Dec 2020 16:24:18 -0800
From:   Ben Widawsky <ben.widawsky@...el.com>
To:     linux-cxl@...r.kernel.org
Cc:     Ben Widawsky <ben.widawsky@...el.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-acpi@...r.kernel.org, Ira Weiny <ira.weiny@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Kelley, Sean V" <sean.v.kelley@...el.com>,
        Rafael Wysocki <rafael.j.wysocki@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Jon Masters <jcm@...masters.org>,
        Chris Browy <cbrowy@...ry-design.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        Christoph Hellwig <hch@...radead.org>
Subject: [RFC PATCH 14/14] WIP/cxl/mem: Add get firmware for testing

This also serves as an example how to add a new command

Signed-off-by: Ben Widawsky <ben.widawsky@...el.com>
---
 drivers/cxl/mem.c            | 22 ++++++++++++++++++++++
 include/uapi/linux/cxl_mem.h |  3 ++-
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index 6b2f8d3776b5..76aa1e6e4117 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -116,6 +116,7 @@ struct cxl_mem_command {
 static struct cxl_mem_command mem_commands[] = {
 	CXL_CMD(INVALID, NONE, 0, 0, "Reserved", false, 0),
 	CXL_CMD(RAW, TAINT, ~0, ~0, "Raw", true, 0),
+	CXL_CMD(GET_FW_INFO, NONE, 0, 0x50, "Get FW Info", false, 0x0200),
 };
 
 static int cxl_mem_wait_for_doorbell(struct cxl_mem *cxlm)
@@ -827,6 +828,23 @@ static int cxl_mem_add_memdev(struct cxl_mem *cxlm)
 	return cxl_register(dev);
 }
 
+static int cxl_mem_enable_commands(struct cxl_mem *cxlm)
+{
+	struct cxl_mem_command *c;
+
+	/*
+	 * For now we pretend Get FW info is supported.
+	 *
+	 * FIXME: Invoke GET LOG to get the Command Effect Logs (CEL).
+	 */
+	c = cxl_mem_find_command(0x200);
+	if (!c)
+		return -ENOENT;
+
+	c->enable = true;
+	return 0;
+}
+
 /**
  * cxl_mem_identify() - Send the IDENTIFY command to the device.
  * @cxlm: The device to identify.
@@ -936,6 +954,10 @@ static int cxl_mem_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	if (rc)
 		return rc;
 
+	rc = cxl_mem_enable_commands(cxlm);
+	if (rc)
+		return rc;
+
 	rc = cxl_mem_identify(cxlm);
 	if (rc)
 		return rc;
diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h
index f2fbb0dcda06..3ac39acf8fa7 100644
--- a/include/uapi/linux/cxl_mem.h
+++ b/include/uapi/linux/cxl_mem.h
@@ -50,7 +50,8 @@ struct cxl_command_info {
 	__u32 id;
 #define CXL_MEM_COMMAND_ID_INVALID 0
 #define CXL_MEM_COMMAND_ID_RAW 1
-#define CXL_MEM_COMMAND_ID_MAX (CXL_MEM_COMMAND_ID_RAW + 1)
+#define CXL_MEM_COMMAND_ID_GET_FW_INFO 2
+#define CXL_MEM_COMMAND_ID_MAX (CXL_MEM_COMMAND_ID_GET_FW_INFO + 1)
 
 	__u32 flags;
 #define CXL_MEM_COMMAND_FLAG_NONE 0
-- 
2.29.2