1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* Copyright(c) 2020 Intel Corporation. */
7 #include <linux/libnvdimm.h>
8 #include <linux/bitfield.h>
9 #include <linux/bitops.h>
15 * The CXL core objects like ports, decoders, and regions are shared
16 * between the subsystem drivers cxl_acpi, cxl_pci, and core drivers
17 * (port-driver, region-driver, nvdimm object-drivers... etc).
20 /* CXL 2.0 8.2.5 CXL.cache and CXL.mem Registers*/
21 #define CXL_CM_OFFSET 0x1000
22 #define CXL_CM_CAP_HDR_OFFSET 0x0
23 #define CXL_CM_CAP_HDR_ID_MASK GENMASK(15, 0)
24 #define CM_CAP_HDR_CAP_ID 1
25 #define CXL_CM_CAP_HDR_VERSION_MASK GENMASK(19, 16)
26 #define CM_CAP_HDR_CAP_VERSION 1
27 #define CXL_CM_CAP_HDR_CACHE_MEM_VERSION_MASK GENMASK(23, 20)
28 #define CM_CAP_HDR_CACHE_MEM_VERSION 1
29 #define CXL_CM_CAP_HDR_ARRAY_SIZE_MASK GENMASK(31, 24)
30 #define CXL_CM_CAP_PTR_MASK GENMASK(31, 20)
32 #define CXL_CM_CAP_CAP_ID_HDM 0x5
33 #define CXL_CM_CAP_CAP_HDM_VERSION 1
35 /* HDM decoders CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure */
36 #define CXL_HDM_DECODER_CAP_OFFSET 0x0
37 #define CXL_HDM_DECODER_COUNT_MASK GENMASK(3, 0)
38 #define CXL_HDM_DECODER_TARGET_COUNT_MASK GENMASK(7, 4)
39 #define CXL_HDM_DECODER0_BASE_LOW_OFFSET 0x10
40 #define CXL_HDM_DECODER0_BASE_HIGH_OFFSET 0x14
41 #define CXL_HDM_DECODER0_SIZE_LOW_OFFSET 0x18
42 #define CXL_HDM_DECODER0_SIZE_HIGH_OFFSET 0x1c
43 #define CXL_HDM_DECODER0_CTRL_OFFSET 0x20
45 static inline int cxl_hdm_decoder_count(u32 cap_hdr
)
47 int val
= FIELD_GET(CXL_HDM_DECODER_COUNT_MASK
, cap_hdr
);
49 return val
? val
* 2 : 1;
52 /* CXL 2.0 8.2.8.1 Device Capabilities Array Register */
53 #define CXLDEV_CAP_ARRAY_OFFSET 0x0
54 #define CXLDEV_CAP_ARRAY_CAP_ID 0
55 #define CXLDEV_CAP_ARRAY_ID_MASK GENMASK_ULL(15, 0)
56 #define CXLDEV_CAP_ARRAY_COUNT_MASK GENMASK_ULL(47, 32)
57 /* CXL 2.0 8.2.8.2 CXL Device Capability Header Register */
58 #define CXLDEV_CAP_HDR_CAP_ID_MASK GENMASK(15, 0)
59 /* CXL 2.0 8.2.8.2.1 CXL Device Capabilities */
60 #define CXLDEV_CAP_CAP_ID_DEVICE_STATUS 0x1
61 #define CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX 0x2
62 #define CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX 0x3
63 #define CXLDEV_CAP_CAP_ID_MEMDEV 0x4000
65 /* CXL 2.0 8.2.8.4 Mailbox Registers */
66 #define CXLDEV_MBOX_CAPS_OFFSET 0x00
67 #define CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK GENMASK(4, 0)
68 #define CXLDEV_MBOX_CTRL_OFFSET 0x04
69 #define CXLDEV_MBOX_CTRL_DOORBELL BIT(0)
70 #define CXLDEV_MBOX_CMD_OFFSET 0x08
71 #define CXLDEV_MBOX_CMD_COMMAND_OPCODE_MASK GENMASK_ULL(15, 0)
72 #define CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK GENMASK_ULL(36, 16)
73 #define CXLDEV_MBOX_STATUS_OFFSET 0x10
74 #define CXLDEV_MBOX_STATUS_RET_CODE_MASK GENMASK_ULL(47, 32)
75 #define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18
76 #define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20
78 #define CXL_COMPONENT_REGS() \
79 void __iomem *hdm_decoder
81 #define CXL_DEVICE_REGS() \
82 void __iomem *status; \
86 /* See note for 'struct cxl_regs' for the rationale of this organization */
88 * CXL_COMPONENT_REGS - Common set of CXL Component register block base pointers
89 * @hdm_decoder: CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure
91 struct cxl_component_regs
{
95 /* See note for 'struct cxl_regs' for the rationale of this organization */
97 * CXL_DEVICE_REGS - Common set of CXL Device register block base pointers
98 * @status: CXL 2.0 8.2.8.3 Device Status Registers
99 * @mbox: CXL 2.0 8.2.8.4 Mailbox Registers
100 * @memdev: CXL 2.0 8.2.8.5 Memory Device Registers
102 struct cxl_device_regs
{
107 * Note, the anonymous union organization allows for per
108 * register-block-type helper routines, without requiring block-type
109 * agnostic code to include the prefix.
114 CXL_COMPONENT_REGS();
116 struct cxl_component_regs component
;
122 struct cxl_device_regs device_regs
;
128 unsigned long offset
;
132 struct cxl_component_reg_map
{
133 struct cxl_reg_map hdm_decoder
;
136 struct cxl_device_reg_map
{
137 struct cxl_reg_map status
;
138 struct cxl_reg_map mbox
;
139 struct cxl_reg_map memdev
;
142 struct cxl_register_map
{
147 struct cxl_component_reg_map component_map
;
148 struct cxl_device_reg_map device_map
;
152 void cxl_probe_component_regs(struct device
*dev
, void __iomem
*base
,
153 struct cxl_component_reg_map
*map
);
154 void cxl_probe_device_regs(struct device
*dev
, void __iomem
*base
,
155 struct cxl_device_reg_map
*map
);
156 int cxl_map_component_regs(struct pci_dev
*pdev
,
157 struct cxl_component_regs
*regs
,
158 struct cxl_register_map
*map
);
159 int cxl_map_device_regs(struct pci_dev
*pdev
,
160 struct cxl_device_regs
*regs
,
161 struct cxl_register_map
*map
);
163 #define CXL_RESOURCE_NONE ((resource_size_t) -1)
164 #define CXL_TARGET_STRLEN 20
167 * cxl_decoder flags that define the type of memory / devices this
168 * decoder supports as well as configuration lock status See "CXL 2.0
169 * 8.2.5.12.7 CXL HDM Decoder 0 Control Register" for details.
171 #define CXL_DECODER_F_RAM BIT(0)
172 #define CXL_DECODER_F_PMEM BIT(1)
173 #define CXL_DECODER_F_TYPE2 BIT(2)
174 #define CXL_DECODER_F_TYPE3 BIT(3)
175 #define CXL_DECODER_F_LOCK BIT(4)
176 #define CXL_DECODER_F_MASK GENMASK(4, 0)
178 enum cxl_decoder_type
{
179 CXL_DECODER_ACCELERATOR
= 2,
180 CXL_DECODER_EXPANDER
= 3,
184 * struct cxl_decoder - CXL address range decode configuration
185 * @dev: this decoder's device
186 * @id: kernel device name id
187 * @range: address range considered by this decoder
188 * @interleave_ways: number of cxl_dports in this decode
189 * @interleave_granularity: data stride per dport
190 * @target_type: accelerator vs expander (type2 vs type3) selector
191 * @flags: memory type capabilities and locking
192 * @target: active ordered target list in current decoder configuration
199 int interleave_granularity
;
200 enum cxl_decoder_type target_type
;
202 struct cxl_dport
*target
[];
206 enum cxl_nvdimm_brige_state
{
213 struct cxl_nvdimm_bridge
{
215 struct cxl_port
*port
;
216 struct nvdimm_bus
*nvdimm_bus
;
217 struct nvdimm_bus_descriptor nd_desc
;
218 struct work_struct state_work
;
219 enum cxl_nvdimm_brige_state state
;
224 struct cxl_memdev
*cxlmd
;
225 struct nvdimm
*nvdimm
;
229 * struct cxl_port - logical collection of upstream port devices and
230 * downstream port devices to construct a CXL memory
232 * @dev: this port's device
233 * @uport: PCI or platform device implementing the upstream port capability
234 * @id: id for port device-name
235 * @dports: cxl_dport instances referenced by decoders
236 * @decoder_ida: allocator for decoder ids
237 * @component_reg_phys: component register capability base address (optional)
241 struct device
*uport
;
243 struct list_head dports
;
244 struct ida decoder_ida
;
245 resource_size_t component_reg_phys
;
249 * struct cxl_dport - CXL downstream port
250 * @dport: PCI bridge or firmware device representing the downstream link
251 * @port_id: unique hardware identifier for dport in decoder target list
252 * @component_reg_phys: downstream port component registers
253 * @port: reference to cxl_port that contains this downstream port
254 * @list: node for a cxl_port's list of cxl_dport instances
257 struct device
*dport
;
259 resource_size_t component_reg_phys
;
260 struct cxl_port
*port
;
261 struct list_head list
;
264 struct cxl_port
*to_cxl_port(struct device
*dev
);
265 struct cxl_port
*devm_cxl_add_port(struct device
*host
, struct device
*uport
,
266 resource_size_t component_reg_phys
,
267 struct cxl_port
*parent_port
);
269 int cxl_add_dport(struct cxl_port
*port
, struct device
*dport
, int port_id
,
270 resource_size_t component_reg_phys
);
272 struct cxl_decoder
*to_cxl_decoder(struct device
*dev
);
273 bool is_root_decoder(struct device
*dev
);
275 devm_cxl_add_decoder(struct device
*host
, struct cxl_port
*port
, int nr_targets
,
276 resource_size_t base
, resource_size_t len
,
277 int interleave_ways
, int interleave_granularity
,
278 enum cxl_decoder_type type
, unsigned long flags
);
281 * Per the CXL specification (8.2.5.12 CXL HDM Decoder Capability Structure)
282 * single ported host-bridges need not publish a decoder capability when a
283 * passthrough decode can be assumed, i.e. all transactions that the uport sees
284 * are claimed and passed to the single dport. Default the range a 0-base
285 * 0-length until the first CXL region is activated.
287 static inline struct cxl_decoder
*
288 devm_cxl_add_passthrough_decoder(struct device
*host
, struct cxl_port
*port
)
290 return devm_cxl_add_decoder(host
, port
, 1, 0, 0, 1, PAGE_SIZE
,
291 CXL_DECODER_EXPANDER
, 0);
294 extern struct bus_type cxl_bus_type
;
298 int (*probe
)(struct device
*dev
);
299 void (*remove
)(struct device
*dev
);
300 struct device_driver drv
;
304 static inline struct cxl_driver
*to_cxl_drv(struct device_driver
*drv
)
306 return container_of(drv
, struct cxl_driver
, drv
);
309 int __cxl_driver_register(struct cxl_driver
*cxl_drv
, struct module
*owner
,
310 const char *modname
);
311 #define cxl_driver_register(x) __cxl_driver_register(x, THIS_MODULE, KBUILD_MODNAME)
312 void cxl_driver_unregister(struct cxl_driver
*cxl_drv
);
314 #define CXL_DEVICE_NVDIMM_BRIDGE 1
315 #define CXL_DEVICE_NVDIMM 2
317 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*")
318 #define CXL_MODALIAS_FMT "cxl:t%d"
320 struct cxl_nvdimm_bridge
*to_cxl_nvdimm_bridge(struct device
*dev
);
321 struct cxl_nvdimm_bridge
*devm_cxl_add_nvdimm_bridge(struct device
*host
,
322 struct cxl_port
*port
);
323 struct cxl_nvdimm
*to_cxl_nvdimm(struct device
*dev
);
324 bool is_cxl_nvdimm(struct device
*dev
);
325 int devm_cxl_add_nvdimm(struct device
*host
, struct cxl_memdev
*cxlmd
);
326 #endif /* __CXL_H__ */