130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|||
|
|
/*
|
|||
|
|
* Copyright 2017 IBM Corp.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
#ifndef _MISC_CXLLIB_H
|
|||
|
|
#define _MISC_CXLLIB_H
|
|||
|
|
|
|||
|
|
#include <linux/pci.h>
|
|||
|
|
#include <asm/reg.h>
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* cxl driver exports a in-kernel 'library' API which can be called by
|
|||
|
|
* other drivers to help interacting with an IBM XSL.
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* tells whether capi is supported on the PCIe slot where the
|
|||
|
|
* device is seated
|
|||
|
|
*
|
|||
|
|
* Input:
|
|||
|
|
* dev: device whose slot needs to be checked
|
|||
|
|
* flags: 0 for the time being
|
|||
|
|
*/
|
|||
|
|
bool cxllib_slot_is_supported(struct pci_dev *dev, unsigned long flags);
|
|||
|
|
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Returns the configuration parameters to be used by the XSL or device
|
|||
|
|
*
|
|||
|
|
* Input:
|
|||
|
|
* dev: device, used to find PHB
|
|||
|
|
* Output:
|
|||
|
|
* struct cxllib_xsl_config:
|
|||
|
|
* version
|
|||
|
|
* capi BAR address, i.e. 0x2000000000000-0x2FFFFFFFFFFFF
|
|||
|
|
* capi BAR size
|
|||
|
|
* data send control (XSL_DSNCTL)
|
|||
|
|
* dummy read address (XSL_DRA)
|
|||
|
|
*/
|
|||
|
|
#define CXL_XSL_CONFIG_VERSION1 1
|
|||
|
|
struct cxllib_xsl_config {
|
|||
|
|
u32 version; /* format version for register encoding */
|
|||
|
|
u32 log_bar_size;/* log size of the capi_window */
|
|||
|
|
u64 bar_addr; /* address of the start of capi window */
|
|||
|
|
u64 dsnctl; /* matches definition of XSL_DSNCTL */
|
|||
|
|
u64 dra; /* real address that can be used for dummy read */
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
int cxllib_get_xsl_config(struct pci_dev *dev, struct cxllib_xsl_config *cfg);
|
|||
|
|
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Activate capi for the pci host bridge associated with the device.
|
|||
|
|
* Can be extended to deactivate once we know how to do it.
|
|||
|
|
* Device must be ready to accept messages from the CAPP unit and
|
|||
|
|
* respond accordingly (TLB invalidates, ...)
|
|||
|
|
*
|
|||
|
|
* PHB is switched to capi mode through calls to skiboot.
|
|||
|
|
* CAPP snooping is activated
|
|||
|
|
*
|
|||
|
|
* Input:
|
|||
|
|
* dev: device whose PHB should switch mode
|
|||
|
|
* mode: mode to switch to i.e. CAPI or PCI
|
|||
|
|
* flags: options related to the mode
|
|||
|
|
*/
|
|||
|
|
enum cxllib_mode {
|
|||
|
|
CXL_MODE_CXL,
|
|||
|
|
CXL_MODE_PCI,
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
#define CXL_MODE_NO_DMA 0
|
|||
|
|
#define CXL_MODE_DMA_TVT0 1
|
|||
|
|
#define CXL_MODE_DMA_TVT1 2
|
|||
|
|
|
|||
|
|
int cxllib_switch_phb_mode(struct pci_dev *dev, enum cxllib_mode mode,
|
|||
|
|
unsigned long flags);
|
|||
|
|
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Set the device for capi DMA.
|
|||
|
|
* Define its dma_ops and dma offset so that allocations will be using TVT#1
|
|||
|
|
*
|
|||
|
|
* Input:
|
|||
|
|
* dev: device to set
|
|||
|
|
* flags: options. CXL_MODE_DMA_TVT1 should be used
|
|||
|
|
*/
|
|||
|
|
int cxllib_set_device_dma(struct pci_dev *dev, unsigned long flags);
|
|||
|
|
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Get the Process Element structure for the given thread
|
|||
|
|
*
|
|||
|
|
* Input:
|
|||
|
|
* task: task_struct for the context of the translation
|
|||
|
|
* translation_mode: whether addresses should be translated
|
|||
|
|
* Output:
|
|||
|
|
* attr: attributes to fill up the Process Element structure from CAIA
|
|||
|
|
*/
|
|||
|
|
struct cxllib_pe_attributes {
|
|||
|
|
u64 sr;
|
|||
|
|
u32 lpid;
|
|||
|
|
u32 tid;
|
|||
|
|
u32 pid;
|
|||
|
|
};
|
|||
|
|
#define CXL_TRANSLATED_MODE 0
|
|||
|
|
#define CXL_REAL_MODE 1
|
|||
|
|
|
|||
|
|
int cxllib_get_PE_attributes(struct task_struct *task,
|
|||
|
|
unsigned long translation_mode, struct cxllib_pe_attributes *attr);
|
|||
|
|
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
* Handle memory fault.
|
|||
|
|
* Fault in all the pages of the specified buffer for the permissions
|
|||
|
|
* provided in ‘flags’
|
|||
|
|
*
|
|||
|
|
* Shouldn't be called from interrupt context
|
|||
|
|
*
|
|||
|
|
* Input:
|
|||
|
|
* mm: struct mm for the thread faulting the pages
|
|||
|
|
* addr: base address of the buffer to page in
|
|||
|
|
* size: size of the buffer to page in
|
|||
|
|
* flags: permission requested (DSISR_ISSTORE...)
|
|||
|
|
*/
|
|||
|
|
int cxllib_handle_fault(struct mm_struct *mm, u64 addr, u64 size, u64 flags);
|
|||
|
|
|
|||
|
|
|
|||
|
|
#endif /* _MISC_CXLLIB_H */
|