[RFC PATCH 06/13] cxl: support type2 memdev creation

[<alucerop@amd.com>]

From: Alejandro Lucero <alucerop@amd.com>

Adding memdev creation to the cxl type2 test driver.

Current cxl core is relying on a CXL_DEVTYPE_CLASSMEM type device when
creating a memdev leading to problems when obtaining cxl_memdev_state
references from a CXL_DEVTYPE_DEVMEM type. This last device type is
managed by a specific vendor driver and does not need same sysfs files
since not userspace intervention is expected. This patch checks for the
right device type in those functions using cxl_memdev_state.

Signed-off-by: Alejandro Lucero <alucerop@amd.com>
---
 drivers/cxl/core/cdat.c             |  3 +++
 drivers/cxl/core/memdev.c           |  9 +++++++++
 drivers/cxl/mem.c                   | 17 +++++++++++------
 tools/testing/cxl/type2/pci_type2.c |  6 ++++++
 4 files changed, 29 insertions(+), 6 deletions(-)

diff --git a/drivers/cxl/core/cdat.c b/drivers/cxl/core/cdat.c
index 97ff1dfd63d6..292efd7e68ad 100644
--- a/drivers/cxl/core/cdat.c
+++ b/drivers/cxl/core/cdat.c
@@ -558,6 +558,9 @@ void cxl_region_perf_data_calculate(struct cxl_region *cxlr,
 	};
 	struct cxl_dpa_perf *perf;
 
+	if (!mds)
+		return;
+
 	switch (cxlr->mode) {
 	case CXL_DECODER_RAM:
 		perf = &mds->ram_perf;
diff --git a/drivers/cxl/core/memdev.c b/drivers/cxl/core/memdev.c
index b61d57d0d4f4..27063cd4ea73 100644
--- a/drivers/cxl/core/memdev.c
+++ b/drivers/cxl/core/memdev.c
@@ -511,6 +511,9 @@ static umode_t cxl_ram_visible(struct kobject *kobj, struct attribute *a, int n)
 	struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
 	struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds);
 
+	if (!mds)
+		return 0;
+
 	if (a == &dev_attr_ram_qos_class.attr)
 		if (mds->ram_perf.qos_class == CXL_QOS_CLASS_INVALID)
 			return 0;
@@ -530,6 +533,9 @@ static umode_t cxl_pmem_visible(struct kobject *kobj, struct attribute *a, int n
 	struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
 	struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds);
 
+	if (!mds)
+		return 0;
+
 	if (a == &dev_attr_pmem_qos_class.attr)
 		if (mds->pmem_perf.qos_class == CXL_QOS_CLASS_INVALID)
 			return 0;
@@ -550,6 +556,9 @@ static umode_t cxl_memdev_security_visible(struct kobject *kobj,
 	struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
 	struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds);
 
+	if (!mds)
+		return 0;
+
 	if (a == &dev_attr_security_sanitize.attr &&
 	    !test_bit(CXL_SEC_ENABLED_SANITIZE, mds->security.enabled_cmds))
 		return 0;
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c
index a168343d2d4d..da63ce486e1a 100644
--- a/drivers/cxl/mem.c
+++ b/drivers/cxl/mem.c
@@ -131,12 +131,14 @@ static int cxl_mem_probe(struct device *dev)
 	dentry = cxl_debugfs_create_dir(dev_name(dev));
 	debugfs_create_devm_seqfile(dev, "dpamem", dentry, cxl_mem_dpa_show);
 
-	if (test_bit(CXL_POISON_ENABLED_INJECT, mds->poison.enabled_cmds))
-		debugfs_create_file("inject_poison", 0200, dentry, cxlmd,
-				    &cxl_poison_inject_fops);
-	if (test_bit(CXL_POISON_ENABLED_CLEAR, mds->poison.enabled_cmds))
-		debugfs_create_file("clear_poison", 0200, dentry, cxlmd,
-				    &cxl_poison_clear_fops);
+	if (mds) {
+		if (test_bit(CXL_POISON_ENABLED_INJECT, mds->poison.enabled_cmds))
+			debugfs_create_file("inject_poison", 0200, dentry, cxlmd,
+					    &cxl_poison_inject_fops);
+		if (test_bit(CXL_POISON_ENABLED_CLEAR, mds->poison.enabled_cmds))
+			debugfs_create_file("clear_poison", 0200, dentry, cxlmd,
+					    &cxl_poison_clear_fops);
+	}
 
 	rc = devm_add_action_or_reset(dev, remove_debugfs, dentry);
 	if (rc)
@@ -221,6 +223,9 @@ static umode_t cxl_mem_visible(struct kobject *kobj, struct attribute *a, int n)
 	struct cxl_memdev *cxlmd = to_cxl_memdev(dev);
 	struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlmd->cxlds);
 
+	if (!mds)
+		return 0;
+
 	if (a == &dev_attr_trigger_poison_list.attr)
 		if (!test_bit(CXL_POISON_ENABLED_LIST,
 			      mds->poison.enabled_cmds))
diff --git a/tools/testing/cxl/type2/pci_type2.c b/tools/testing/cxl/type2/pci_type2.c
index b12f13e676fb..f157139b712f 100644
--- a/tools/testing/cxl/type2/pci_type2.c
+++ b/tools/testing/cxl/type2/pci_type2.c
@@ -5,6 +5,7 @@
 #include <linux/cxlmem.h>
 
 struct cxl_dev_state *cxlds;
+struct cxl_memdev *cxlmd;
 
 #define CXL_TYPE2_MEM_SIZE   (1024*1024*256)
 
@@ -66,6 +67,11 @@ static int type2_pci_probe(struct pci_dev *pci_dev,
 	else
 		dev_warn(&pci_dev->dev, "Media not active (%d)\n", rc);
 
+	pci_info(pci_dev, "cxl adding memdev...");
+	cxlmd = devm_cxl_add_memdev(&pci_dev->dev, cxlds);
+	if (IS_ERR(cxlmd))
+		return PTR_ERR(cxlmd);
+
 	return 0;
 }
 
-- 
2.17.1