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/* SPDX-License-Identifier: GPL-2.0-only */
/* Copyright(c) 2020 Intel Corporation. All rights reserved. */
#ifndef __CXL_PCI_H__
#define __CXL_PCI_H__
#include <linux/pci.h>
#include "cxl.h"
#define CXL_MEMORY_PROGIF 0x10
/*
* NOTE: Currently all the functions which are enabled for CXL require their
* vectors to be in the first 16. Use this as the default max.
*/
#define CXL_PCI_DEFAULT_MAX_VECTORS 16
/* Register Block Identifier (RBI) */
enum cxl_regloc_type {
CXL_REGLOC_RBI_EMPTY = 0,
CXL_REGLOC_RBI_COMPONENT,
CXL_REGLOC_RBI_VIRT,
CXL_REGLOC_RBI_MEMDEV,
CXL_REGLOC_RBI_PMU,
CXL_REGLOC_RBI_TYPES
};
/*
* Table Access DOE, CDAT Read Entry Response
*
* Spec refs:
*
* CXL 3.1 8.1.11, Table 8-14: Read Entry Response
* CDAT Specification 1.03: 2 CDAT Data Structures
*/
struct cdat_header {
__le32 length;
u8 revision;
u8 checksum;
u8 reserved[6];
__le32 sequence;
} __packed;
struct cdat_entry_header {
u8 type;
u8 reserved;
__le16 length;
} __packed;
/*
* The DOE CDAT read response contains a CDAT read entry (either the
* CDAT header or a structure).
*/
union cdat_data {
struct cdat_header header;
struct cdat_entry_header entry;
} __packed;
/* There is an additional CDAT response header of 4 bytes. */
struct cdat_doe_rsp {
__le32 doe_header;
u8 data[];
} __packed;
/*
* CXL v3.0 6.2.3 Table 6-4
* The table indicates that if PCIe Flit Mode is set, then CXL is in 256B flits
* mode, otherwise it's 68B flits mode.
*/
static inline bool cxl_pci_flit_256(struct pci_dev *pdev)
{
u16 lnksta2;
pcie_capability_read_word(pdev, PCI_EXP_LNKSTA2, &lnksta2);
return lnksta2 & PCI_EXP_LNKSTA2_FLIT;
}
struct cxl_dev_state;
void read_cdat_data(struct cxl_port *port);
#ifdef CONFIG_CXL_RAS
void cxl_cor_error_detected(struct pci_dev *pdev);
pci_ers_result_t cxl_error_detected(struct pci_dev *pdev,
pci_channel_state_t state);
void devm_cxl_dport_rch_ras_setup(struct cxl_dport *dport);
void devm_cxl_port_ras_setup(struct cxl_port *port);
#else
static inline void cxl_cor_error_detected(struct pci_dev *pdev) { }
static inline pci_ers_result_t cxl_error_detected(struct pci_dev *pdev,
pci_channel_state_t state)
{
return PCI_ERS_RESULT_NONE;
}
static inline void devm_cxl_dport_rch_ras_setup(struct cxl_dport *dport)
{
}
static inline void devm_cxl_port_ras_setup(struct cxl_port *port)
{
}
#endif
#endif /* __CXL_PCI_H__ */
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