21083f5152
While a memX device on /sys/bus/cxl represents a CXL memory expander
control interface, a pmemX device represents the persistent memory
sub-functionality. It bridges the CXL subystem to the libnvdimm nmemX
control interface.
With this skeleton ndctl can now see persistent memory devices on a
"CXL" bus. Later patches add support for translating libnvdimm native
commands to CXL commands.
# ndctl list -BDiu -b CXL
{
"provider":"CXL",
"dev":"ndbus1",
"dimms":[
{
"dev":"nmem1",
"state":"disabled"
},
{
"dev":"nmem0",
"state":"disabled"
}
]
}
Given nvdimm_bus_unregister() removes all devices on an ndbus0 the
cxl_pmem infrastructure needs to arrange ->remove() to be triggered on
cxl_nvdimm devices to keep their enabled state synchronized with the
registration state of their corresponding device on the nvdimm_bus. In
other words, always arrange for cxl_nvdimm_driver.remove() to unregister
nvdimms from an nvdimm_bus ahead of the bus being unregistered.
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Link: https://lore.kernel.org/r/162380012696.3039556.4293801691038740850.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
328 lines
9.9 KiB
C
328 lines
9.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* Copyright(c) 2020 Intel Corporation. */
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#ifndef __CXL_H__
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#define __CXL_H__
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#include <linux/libnvdimm.h>
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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#include <linux/io.h>
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/**
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* DOC: cxl objects
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*
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* The CXL core objects like ports, decoders, and regions are shared
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* between the subsystem drivers cxl_acpi, cxl_pci, and core drivers
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* (port-driver, region-driver, nvdimm object-drivers... etc).
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*/
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/* CXL 2.0 8.2.5 CXL.cache and CXL.mem Registers*/
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#define CXL_CM_OFFSET 0x1000
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#define CXL_CM_CAP_HDR_OFFSET 0x0
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#define CXL_CM_CAP_HDR_ID_MASK GENMASK(15, 0)
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#define CM_CAP_HDR_CAP_ID 1
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#define CXL_CM_CAP_HDR_VERSION_MASK GENMASK(19, 16)
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#define CM_CAP_HDR_CAP_VERSION 1
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#define CXL_CM_CAP_HDR_CACHE_MEM_VERSION_MASK GENMASK(23, 20)
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#define CM_CAP_HDR_CACHE_MEM_VERSION 1
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#define CXL_CM_CAP_HDR_ARRAY_SIZE_MASK GENMASK(31, 24)
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#define CXL_CM_CAP_PTR_MASK GENMASK(31, 20)
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#define CXL_CM_CAP_CAP_ID_HDM 0x5
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#define CXL_CM_CAP_CAP_HDM_VERSION 1
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/* HDM decoders CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure */
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#define CXL_HDM_DECODER_CAP_OFFSET 0x0
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#define CXL_HDM_DECODER_COUNT_MASK GENMASK(3, 0)
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#define CXL_HDM_DECODER_TARGET_COUNT_MASK GENMASK(7, 4)
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#define CXL_HDM_DECODER0_BASE_LOW_OFFSET 0x10
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#define CXL_HDM_DECODER0_BASE_HIGH_OFFSET 0x14
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#define CXL_HDM_DECODER0_SIZE_LOW_OFFSET 0x18
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#define CXL_HDM_DECODER0_SIZE_HIGH_OFFSET 0x1c
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#define CXL_HDM_DECODER0_CTRL_OFFSET 0x20
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static inline int cxl_hdm_decoder_count(u32 cap_hdr)
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{
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int val = FIELD_GET(CXL_HDM_DECODER_COUNT_MASK, cap_hdr);
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return val ? val * 2 : 1;
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}
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/* CXL 2.0 8.2.8.1 Device Capabilities Array Register */
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#define CXLDEV_CAP_ARRAY_OFFSET 0x0
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#define CXLDEV_CAP_ARRAY_CAP_ID 0
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#define CXLDEV_CAP_ARRAY_ID_MASK GENMASK_ULL(15, 0)
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#define CXLDEV_CAP_ARRAY_COUNT_MASK GENMASK_ULL(47, 32)
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/* CXL 2.0 8.2.8.2 CXL Device Capability Header Register */
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#define CXLDEV_CAP_HDR_CAP_ID_MASK GENMASK(15, 0)
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/* CXL 2.0 8.2.8.2.1 CXL Device Capabilities */
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#define CXLDEV_CAP_CAP_ID_DEVICE_STATUS 0x1
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#define CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX 0x2
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#define CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX 0x3
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#define CXLDEV_CAP_CAP_ID_MEMDEV 0x4000
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/* CXL 2.0 8.2.8.4 Mailbox Registers */
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#define CXLDEV_MBOX_CAPS_OFFSET 0x00
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#define CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK GENMASK(4, 0)
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#define CXLDEV_MBOX_CTRL_OFFSET 0x04
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#define CXLDEV_MBOX_CTRL_DOORBELL BIT(0)
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#define CXLDEV_MBOX_CMD_OFFSET 0x08
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#define CXLDEV_MBOX_CMD_COMMAND_OPCODE_MASK GENMASK_ULL(15, 0)
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#define CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK GENMASK_ULL(36, 16)
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#define CXLDEV_MBOX_STATUS_OFFSET 0x10
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#define CXLDEV_MBOX_STATUS_RET_CODE_MASK GENMASK_ULL(47, 32)
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#define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18
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#define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20
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#define CXL_COMPONENT_REGS() \
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void __iomem *hdm_decoder
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#define CXL_DEVICE_REGS() \
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void __iomem *status; \
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void __iomem *mbox; \
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void __iomem *memdev
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/* See note for 'struct cxl_regs' for the rationale of this organization */
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/*
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* CXL_COMPONENT_REGS - Common set of CXL Component register block base pointers
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* @hdm_decoder: CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure
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*/
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struct cxl_component_regs {
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CXL_COMPONENT_REGS();
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};
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/* See note for 'struct cxl_regs' for the rationale of this organization */
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/*
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* CXL_DEVICE_REGS - Common set of CXL Device register block base pointers
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* @status: CXL 2.0 8.2.8.3 Device Status Registers
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* @mbox: CXL 2.0 8.2.8.4 Mailbox Registers
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* @memdev: CXL 2.0 8.2.8.5 Memory Device Registers
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*/
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struct cxl_device_regs {
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CXL_DEVICE_REGS();
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};
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/*
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* Note, the anonymous union organization allows for per
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* register-block-type helper routines, without requiring block-type
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* agnostic code to include the prefix.
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*/
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struct cxl_regs {
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union {
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struct {
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CXL_COMPONENT_REGS();
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};
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struct cxl_component_regs component;
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};
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union {
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struct {
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CXL_DEVICE_REGS();
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};
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struct cxl_device_regs device_regs;
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};
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};
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struct cxl_reg_map {
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bool valid;
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unsigned long offset;
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unsigned long size;
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};
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struct cxl_component_reg_map {
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struct cxl_reg_map hdm_decoder;
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};
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struct cxl_device_reg_map {
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struct cxl_reg_map status;
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struct cxl_reg_map mbox;
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struct cxl_reg_map memdev;
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};
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struct cxl_register_map {
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struct list_head list;
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u64 block_offset;
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u8 reg_type;
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u8 barno;
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union {
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struct cxl_component_reg_map component_map;
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struct cxl_device_reg_map device_map;
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};
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};
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void cxl_probe_component_regs(struct device *dev, void __iomem *base,
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struct cxl_component_reg_map *map);
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void cxl_probe_device_regs(struct device *dev, void __iomem *base,
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struct cxl_device_reg_map *map);
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int cxl_map_component_regs(struct pci_dev *pdev,
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struct cxl_component_regs *regs,
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struct cxl_register_map *map);
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int cxl_map_device_regs(struct pci_dev *pdev,
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struct cxl_device_regs *regs,
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struct cxl_register_map *map);
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#define CXL_RESOURCE_NONE ((resource_size_t) -1)
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#define CXL_TARGET_STRLEN 20
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/*
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* cxl_decoder flags that define the type of memory / devices this
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* decoder supports as well as configuration lock status See "CXL 2.0
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* 8.2.5.12.7 CXL HDM Decoder 0 Control Register" for details.
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*/
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#define CXL_DECODER_F_RAM BIT(0)
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#define CXL_DECODER_F_PMEM BIT(1)
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#define CXL_DECODER_F_TYPE2 BIT(2)
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#define CXL_DECODER_F_TYPE3 BIT(3)
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#define CXL_DECODER_F_LOCK BIT(4)
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#define CXL_DECODER_F_MASK GENMASK(4, 0)
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enum cxl_decoder_type {
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CXL_DECODER_ACCELERATOR = 2,
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CXL_DECODER_EXPANDER = 3,
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};
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/**
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* struct cxl_decoder - CXL address range decode configuration
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* @dev: this decoder's device
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* @id: kernel device name id
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* @range: address range considered by this decoder
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* @interleave_ways: number of cxl_dports in this decode
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* @interleave_granularity: data stride per dport
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* @target_type: accelerator vs expander (type2 vs type3) selector
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* @flags: memory type capabilities and locking
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* @target: active ordered target list in current decoder configuration
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*/
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struct cxl_decoder {
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struct device dev;
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int id;
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struct range range;
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int interleave_ways;
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int interleave_granularity;
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enum cxl_decoder_type target_type;
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unsigned long flags;
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struct cxl_dport *target[];
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};
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enum cxl_nvdimm_brige_state {
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CXL_NVB_NEW,
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CXL_NVB_DEAD,
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CXL_NVB_ONLINE,
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CXL_NVB_OFFLINE,
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};
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struct cxl_nvdimm_bridge {
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struct device dev;
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struct cxl_port *port;
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struct nvdimm_bus *nvdimm_bus;
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struct nvdimm_bus_descriptor nd_desc;
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struct work_struct state_work;
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enum cxl_nvdimm_brige_state state;
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};
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struct cxl_nvdimm {
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struct device dev;
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struct cxl_memdev *cxlmd;
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struct nvdimm *nvdimm;
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};
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/**
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* struct cxl_port - logical collection of upstream port devices and
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* downstream port devices to construct a CXL memory
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* decode hierarchy.
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* @dev: this port's device
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* @uport: PCI or platform device implementing the upstream port capability
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* @id: id for port device-name
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* @dports: cxl_dport instances referenced by decoders
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* @decoder_ida: allocator for decoder ids
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* @component_reg_phys: component register capability base address (optional)
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*/
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struct cxl_port {
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struct device dev;
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struct device *uport;
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int id;
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struct list_head dports;
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struct ida decoder_ida;
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resource_size_t component_reg_phys;
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};
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/**
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* struct cxl_dport - CXL downstream port
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* @dport: PCI bridge or firmware device representing the downstream link
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* @port_id: unique hardware identifier for dport in decoder target list
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* @component_reg_phys: downstream port component registers
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* @port: reference to cxl_port that contains this downstream port
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* @list: node for a cxl_port's list of cxl_dport instances
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*/
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struct cxl_dport {
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struct device *dport;
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int port_id;
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resource_size_t component_reg_phys;
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struct cxl_port *port;
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struct list_head list;
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};
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struct cxl_port *to_cxl_port(struct device *dev);
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struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport,
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resource_size_t component_reg_phys,
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struct cxl_port *parent_port);
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int cxl_add_dport(struct cxl_port *port, struct device *dport, int port_id,
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resource_size_t component_reg_phys);
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struct cxl_decoder *to_cxl_decoder(struct device *dev);
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bool is_root_decoder(struct device *dev);
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struct cxl_decoder *
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devm_cxl_add_decoder(struct device *host, struct cxl_port *port, int nr_targets,
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resource_size_t base, resource_size_t len,
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int interleave_ways, int interleave_granularity,
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enum cxl_decoder_type type, unsigned long flags);
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/*
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* Per the CXL specification (8.2.5.12 CXL HDM Decoder Capability Structure)
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* single ported host-bridges need not publish a decoder capability when a
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* passthrough decode can be assumed, i.e. all transactions that the uport sees
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* are claimed and passed to the single dport. Default the range a 0-base
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* 0-length until the first CXL region is activated.
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*/
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static inline struct cxl_decoder *
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devm_cxl_add_passthrough_decoder(struct device *host, struct cxl_port *port)
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{
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return devm_cxl_add_decoder(host, port, 1, 0, 0, 1, PAGE_SIZE,
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CXL_DECODER_EXPANDER, 0);
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}
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extern struct bus_type cxl_bus_type;
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struct cxl_driver {
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const char *name;
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int (*probe)(struct device *dev);
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void (*remove)(struct device *dev);
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struct device_driver drv;
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int id;
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};
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static inline struct cxl_driver *to_cxl_drv(struct device_driver *drv)
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{
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return container_of(drv, struct cxl_driver, drv);
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}
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int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner,
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const char *modname);
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#define cxl_driver_register(x) __cxl_driver_register(x, THIS_MODULE, KBUILD_MODNAME)
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void cxl_driver_unregister(struct cxl_driver *cxl_drv);
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#define CXL_DEVICE_NVDIMM_BRIDGE 1
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#define CXL_DEVICE_NVDIMM 2
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#define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*")
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#define CXL_MODALIAS_FMT "cxl:t%d"
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struct cxl_nvdimm_bridge *to_cxl_nvdimm_bridge(struct device *dev);
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struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host,
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struct cxl_port *port);
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struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev);
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bool is_cxl_nvdimm(struct device *dev);
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int devm_cxl_add_nvdimm(struct device *host, struct cxl_memdev *cxlmd);
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#endif /* __CXL_H__ */
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