Add a library API for clearing and injecting poison into a CXL memory
device through the CXL debugfs.
This API will be used by the 'cxl-inject-error' and 'cxl-clear-error'
commands in later commits.
Signed-off-by: Ben Cheatham <benjamin.cheat...@amd.com>
---
cxl/lib/libcxl.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++
cxl/lib/libcxl.sym | 3 +++
cxl/libcxl.h | 3 +++
3 files changed, 66 insertions(+)
diff --git a/cxl/lib/libcxl.c b/cxl/lib/libcxl.c
index 0403fa9..e1c9951 100644
--- a/cxl/lib/libcxl.c
+++ b/cxl/lib/libcxl.c
@@ -4897,3 +4897,63 @@ CXL_EXPORT struct cxl_cmd
*cxl_cmd_new_set_alert_config(struct cxl_memdev *memde
{
return cxl_cmd_new_generic(memdev, CXL_MEM_COMMAND_ID_SET_ALERT_CONFIG);
}
+
+CXL_EXPORT bool cxl_memdev_has_poison_injection(struct cxl_memdev *memdev)
+{
+ struct cxl_ctx *ctx = memdev->ctx;
+ size_t path_len;
+ bool exists;
+ char *path;
+
+ if (!ctx->debugfs)
+ return false;
+
+ path_len = strlen(ctx->debugfs) + 100;
+ path = calloc(path_len, sizeof(char));
+ if (!path)
+ return false;
+
+ snprintf(path, path_len, "%s/cxl/%s/inject_poison", ctx->debugfs,
+ cxl_memdev_get_devname(memdev));
+ exists = access(path, F_OK) == 0;
+
+ free(path);
+ return exists;
+}
+
+static int cxl_memdev_poison_action(struct cxl_memdev *memdev, size_t dpa,
+ bool clear)
+{
+ struct cxl_ctx *ctx = memdev->ctx;
+ size_t path_len;
+ char addr[32];
+ char *path;
+ int rc;
+
+ if (!ctx->debugfs)
+ return -ENOENT;
+
+ path_len = strlen(ctx->debugfs) + 100;
+ path = calloc(path_len, sizeof(char));
+ if (!path)
+ return -ENOMEM;
+
+ snprintf(path, path_len, "%s/cxl/%s/%s", ctx->debugfs,
+ cxl_memdev_get_devname(memdev),
+ clear ? "clear_poison" : "inject_poison");
+ snprintf(addr, 32, "0x%lx\n", dpa);
+
+ rc = sysfs_write_attr(ctx, path, addr);
+ free(path);
+ return rc;
+}
+
+CXL_EXPORT int cxl_memdev_inject_poison(struct cxl_memdev *memdev, size_t addr)
+{
+ return cxl_memdev_poison_action(memdev, addr, false);
+}
+
+CXL_EXPORT int cxl_memdev_clear_poison(struct cxl_memdev *memdev, size_t addr)
+{
+ return cxl_memdev_poison_action(memdev, addr, true);
+}
diff --git a/cxl/lib/libcxl.sym b/cxl/lib/libcxl.sym
index 61ed0db..012d344 100644
--- a/cxl/lib/libcxl.sym
+++ b/cxl/lib/libcxl.sym
@@ -295,4 +295,7 @@ global:
cxl_protocol_error_get_num;
cxl_protocol_error_get_str;
cxl_dport_protocol_error_inject;
+ cxl_memdev_has_poison_injection;
+ cxl_memdev_inject_poison;
+ cxl_memdev_clear_poison;
} LIBECXL_8;
diff --git a/cxl/libcxl.h b/cxl/libcxl.h
index afa076a..fa007d0 100644
--- a/cxl/libcxl.h
+++ b/cxl/libcxl.h
@@ -100,6 +100,9 @@ int cxl_memdev_read_label(struct cxl_memdev *memdev, void
*buf, size_t length,
size_t offset);
int cxl_memdev_write_label(struct cxl_memdev *memdev, void *buf, size_t length,
size_t offset);
+bool cxl_memdev_has_poison_injection(struct cxl_memdev *memdev);
+int cxl_memdev_inject_poison(struct cxl_memdev *memdev, size_t dpa);
+int cxl_memdev_clear_poison(struct cxl_memdev *memdev, size_t dpa);
struct cxl_cmd *cxl_cmd_new_get_fw_info(struct cxl_memdev *memdev);
unsigned int cxl_cmd_fw_info_get_num_slots(struct cxl_cmd *cmd);
unsigned int cxl_cmd_fw_info_get_active_slot(struct cxl_cmd *cmd);
--
2.34.1
