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-rw-r--r--drivers/cxl/mem.h81
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/cxl/mem.h b/drivers/cxl/mem.h
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index 000000000000..8f02d02b26b4
--- /dev/null
+++ b/drivers/cxl/mem.h
@@ -0,0 +1,81 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* Copyright(c) 2020-2021 Intel Corporation. */
+#ifndef __CXL_MEM_H__
+#define __CXL_MEM_H__
+#include <linux/cdev.h>
+#include "cxl.h"
+
+/* CXL 2.0 8.2.8.5.1.1 Memory Device Status Register */
+#define CXLMDEV_STATUS_OFFSET 0x0
+#define CXLMDEV_DEV_FATAL BIT(0)
+#define CXLMDEV_FW_HALT BIT(1)
+#define CXLMDEV_STATUS_MEDIA_STATUS_MASK GENMASK(3, 2)
+#define CXLMDEV_MS_NOT_READY 0
+#define CXLMDEV_MS_READY 1
+#define CXLMDEV_MS_ERROR 2
+#define CXLMDEV_MS_DISABLED 3
+#define CXLMDEV_READY(status) \
+ (FIELD_GET(CXLMDEV_STATUS_MEDIA_STATUS_MASK, status) == \
+ CXLMDEV_MS_READY)
+#define CXLMDEV_MBOX_IF_READY BIT(4)
+#define CXLMDEV_RESET_NEEDED_MASK GENMASK(7, 5)
+#define CXLMDEV_RESET_NEEDED_NOT 0
+#define CXLMDEV_RESET_NEEDED_COLD 1
+#define CXLMDEV_RESET_NEEDED_WARM 2
+#define CXLMDEV_RESET_NEEDED_HOT 3
+#define CXLMDEV_RESET_NEEDED_CXL 4
+#define CXLMDEV_RESET_NEEDED(status) \
+ (FIELD_GET(CXLMDEV_RESET_NEEDED_MASK, status) != \
+ CXLMDEV_RESET_NEEDED_NOT)
+
+/*
+ * An entire PCI topology full of devices should be enough for any
+ * config
+ */
+#define CXL_MEM_MAX_DEVS 65536
+
+/**
+ * struct cxl_memdev - CXL bus object representing a Type-3 Memory Device
+ * @dev: driver core device object
+ * @cdev: char dev core object for ioctl operations
+ * @cxlm: pointer to the parent device driver data
+ * @id: id number of this memdev instance.
+ */
+struct cxl_memdev {
+ struct device dev;
+ struct cdev cdev;
+ struct cxl_mem *cxlm;
+ int id;
+};
+
+/**
+ * struct cxl_mem - A CXL memory device
+ * @pdev: The PCI device associated with this CXL device.
+ * @cxlmd: Logical memory device chardev / interface
+ * @regs: Parsed register blocks
+ * @payload_size: Size of space for payload
+ * (CXL 2.0 8.2.8.4.3 Mailbox Capabilities Register)
+ * @lsa_size: Size of Label Storage Area
+ * (CXL 2.0 8.2.9.5.1.1 Identify Memory Device)
+ * @mbox_mutex: Mutex to synchronize mailbox access.
+ * @firmware_version: Firmware version for the memory device.
+ * @enabled_cmds: Hardware commands found enabled in CEL.
+ * @pmem_range: Persistent memory capacity information.
+ * @ram_range: Volatile memory capacity information.
+ */
+struct cxl_mem {
+ struct pci_dev *pdev;
+ struct cxl_memdev *cxlmd;
+
+ struct cxl_regs regs;
+
+ size_t payload_size;
+ size_t lsa_size;
+ struct mutex mbox_mutex; /* Protects device mailbox and firmware */
+ char firmware_version[0x10];
+ unsigned long *enabled_cmds;
+
+ struct range pmem_range;
+ struct range ram_range;
+};
+#endif /* __CXL_MEM_H__ */