mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Alastair D'Silva](/assets/img/avatar_default.png)
This patch addresses warnings and errors from the kernel doc scripts for the OpenCAPI driver. It also makes minor tweaks to make the docs more consistent. Signed-off-by: Alastair D'Silva <alastair@d-silva.org> Acked-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200415012343.919255-3-alastair@d-silva.org
477 lines
14 KiB
C
477 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
// Copyright 2017 IBM Corp.
|
|
#ifndef _MISC_OCXL_H_
|
|
#define _MISC_OCXL_H_
|
|
|
|
#include <linux/pci.h>
|
|
|
|
/*
|
|
* Opencapi drivers all need some common facilities, like parsing the
|
|
* device configuration space, adding a Process Element to the Shared
|
|
* Process Area, etc...
|
|
*
|
|
* The ocxl module provides a kernel API, to allow other drivers to
|
|
* reuse common code. A bit like a in-kernel library.
|
|
*/
|
|
|
|
#define OCXL_AFU_NAME_SZ (24+1) /* add 1 for NULL termination */
|
|
|
|
|
|
struct ocxl_afu_config {
|
|
u8 idx;
|
|
int dvsec_afu_control_pos; /* offset of AFU control DVSEC */
|
|
char name[OCXL_AFU_NAME_SZ];
|
|
u8 version_major;
|
|
u8 version_minor;
|
|
u8 afuc_type;
|
|
u8 afum_type;
|
|
u8 profile;
|
|
u8 global_mmio_bar; /* global MMIO area */
|
|
u64 global_mmio_offset;
|
|
u32 global_mmio_size;
|
|
u8 pp_mmio_bar; /* per-process MMIO area */
|
|
u64 pp_mmio_offset;
|
|
u32 pp_mmio_stride;
|
|
u64 lpc_mem_offset;
|
|
u64 lpc_mem_size;
|
|
u64 special_purpose_mem_offset;
|
|
u64 special_purpose_mem_size;
|
|
u8 pasid_supported_log;
|
|
u16 actag_supported;
|
|
};
|
|
|
|
struct ocxl_fn_config {
|
|
int dvsec_tl_pos; /* offset of the Transaction Layer DVSEC */
|
|
int dvsec_function_pos; /* offset of the Function DVSEC */
|
|
int dvsec_afu_info_pos; /* offset of the AFU information DVSEC */
|
|
s8 max_pasid_log;
|
|
s8 max_afu_index;
|
|
};
|
|
|
|
enum ocxl_endian {
|
|
OCXL_BIG_ENDIAN = 0, /**< AFU data is big-endian */
|
|
OCXL_LITTLE_ENDIAN = 1, /**< AFU data is little-endian */
|
|
OCXL_HOST_ENDIAN = 2, /**< AFU data is the same endianness as the host */
|
|
};
|
|
|
|
// These are opaque outside the ocxl driver
|
|
struct ocxl_afu;
|
|
struct ocxl_fn;
|
|
struct ocxl_context;
|
|
|
|
// Device detection & initialisation
|
|
|
|
/**
|
|
* ocxl_function_open() - Open an OpenCAPI function on an OpenCAPI device
|
|
* @dev: The PCI device that contains the function
|
|
*
|
|
* Returns an opaque pointer to the function, or an error pointer (check with IS_ERR)
|
|
*/
|
|
struct ocxl_fn *ocxl_function_open(struct pci_dev *dev);
|
|
|
|
/**
|
|
* ocxl_function_afu_list() - Get the list of AFUs associated with a PCI function device
|
|
* Returns a list of struct ocxl_afu *
|
|
*
|
|
* @fn: The OpenCAPI function containing the AFUs
|
|
*/
|
|
struct list_head *ocxl_function_afu_list(struct ocxl_fn *fn);
|
|
|
|
/**
|
|
* ocxl_function_fetch_afu() - Fetch an AFU instance from an OpenCAPI function
|
|
* @fn: The OpenCAPI function to get the AFU from
|
|
* @afu_idx: The index of the AFU to get
|
|
*
|
|
* If successful, the AFU should be released with ocxl_afu_put()
|
|
*
|
|
* Returns a pointer to the AFU, or NULL on error
|
|
*/
|
|
struct ocxl_afu *ocxl_function_fetch_afu(struct ocxl_fn *fn, u8 afu_idx);
|
|
|
|
/**
|
|
* ocxl_afu_get() - Take a reference to an AFU
|
|
* @afu: The AFU to increment the reference count on
|
|
*/
|
|
void ocxl_afu_get(struct ocxl_afu *afu);
|
|
|
|
/**
|
|
* ocxl_afu_put() - Release a reference to an AFU
|
|
* @afu: The AFU to decrement the reference count on
|
|
*/
|
|
void ocxl_afu_put(struct ocxl_afu *afu);
|
|
|
|
|
|
/**
|
|
* ocxl_function_config() - Get the configuration information for an OpenCAPI function
|
|
* @fn: The OpenCAPI function to get the config for
|
|
*
|
|
* Returns the function config, or NULL on error
|
|
*/
|
|
const struct ocxl_fn_config *ocxl_function_config(struct ocxl_fn *fn);
|
|
|
|
/**
|
|
* ocxl_function_close() - Close an OpenCAPI function
|
|
* This will free any AFUs previously retrieved from the function, and
|
|
* detach and associated contexts. The contexts must by freed by the caller.
|
|
*
|
|
* @fn: The OpenCAPI function to close
|
|
*
|
|
*/
|
|
void ocxl_function_close(struct ocxl_fn *fn);
|
|
|
|
// Context allocation
|
|
|
|
/**
|
|
* ocxl_context_alloc() - Allocate an OpenCAPI context
|
|
* @context: The OpenCAPI context to allocate, must be freed with ocxl_context_free
|
|
* @afu: The AFU the context belongs to
|
|
* @mapping: The mapping to unmap when the context is closed (may be NULL)
|
|
*/
|
|
int ocxl_context_alloc(struct ocxl_context **context, struct ocxl_afu *afu,
|
|
struct address_space *mapping);
|
|
|
|
/**
|
|
* ocxl_context_free() - Free an OpenCAPI context
|
|
* @ctx: The OpenCAPI context to free
|
|
*/
|
|
void ocxl_context_free(struct ocxl_context *ctx);
|
|
|
|
/**
|
|
* ocxl_context_attach() - Grant access to an MM to an OpenCAPI context
|
|
* @ctx: The OpenCAPI context to attach
|
|
* @amr: The value of the AMR register to restrict access
|
|
* @mm: The mm to attach to the context
|
|
*
|
|
* Returns 0 on success, negative on failure
|
|
*/
|
|
int ocxl_context_attach(struct ocxl_context *ctx, u64 amr,
|
|
struct mm_struct *mm);
|
|
|
|
/**
|
|
* ocxl_context_detach() - Detach an MM from an OpenCAPI context
|
|
* @ctx: The OpenCAPI context to attach
|
|
*
|
|
* Returns 0 on success, negative on failure
|
|
*/
|
|
int ocxl_context_detach(struct ocxl_context *ctx);
|
|
|
|
// AFU IRQs
|
|
|
|
/**
|
|
* ocxl_afu_irq_alloc() - Allocate an IRQ associated with an AFU context
|
|
* @ctx: the AFU context
|
|
* @irq_id: out, the IRQ ID
|
|
*
|
|
* Returns 0 on success, negative on failure
|
|
*/
|
|
int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id);
|
|
|
|
/**
|
|
* ocxl_afu_irq_free() - Frees an IRQ associated with an AFU context
|
|
* @ctx: the AFU context
|
|
* @irq_id: the IRQ ID
|
|
*
|
|
* Returns 0 on success, negative on failure
|
|
*/
|
|
int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id);
|
|
|
|
/**
|
|
* ocxl_afu_irq_get_addr() - Gets the address of the trigger page for an IRQ
|
|
* This can then be provided to an AFU which will write to that
|
|
* page to trigger the IRQ.
|
|
* @ctx: The AFU context that the IRQ is associated with
|
|
* @irq_id: The IRQ ID
|
|
*
|
|
* returns the trigger page address, or 0 if the IRQ is not valid
|
|
*/
|
|
u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id);
|
|
|
|
/**
|
|
* ocxl_irq_set_handler() - Provide a callback to be called when an IRQ is triggered
|
|
* @ctx: The AFU context that the IRQ is associated with
|
|
* @irq_id: The IRQ ID
|
|
* @handler: the callback to be called when the IRQ is triggered
|
|
* @free_private: the callback to be called when the IRQ is freed (may be NULL)
|
|
* @private: Private data to be passed to the callbacks
|
|
*
|
|
* Returns 0 on success, negative on failure
|
|
*/
|
|
int ocxl_irq_set_handler(struct ocxl_context *ctx, int irq_id,
|
|
irqreturn_t (*handler)(void *private),
|
|
void (*free_private)(void *private),
|
|
void *private);
|
|
|
|
// AFU Metadata
|
|
|
|
/**
|
|
* ocxl_afu_config() - Get a pointer to the config for an AFU
|
|
* @afu: a pointer to the AFU to get the config for
|
|
*
|
|
* Returns a pointer to the AFU config
|
|
*/
|
|
struct ocxl_afu_config *ocxl_afu_config(struct ocxl_afu *afu);
|
|
|
|
/**
|
|
* ocxl_afu_set_private() - Assign opaque hardware specific information to an OpenCAPI AFU.
|
|
* @afu: The OpenCAPI AFU
|
|
* @private: the opaque hardware specific information to assign to the driver
|
|
*/
|
|
void ocxl_afu_set_private(struct ocxl_afu *afu, void *private);
|
|
|
|
/**
|
|
* ocxl_afu_get_private() - Fetch the hardware specific information associated with
|
|
* an external OpenCAPI AFU. This may be consumed by an external OpenCAPI driver.
|
|
* @afu: The OpenCAPI AFU
|
|
*
|
|
* Returns the opaque pointer associated with the device, or NULL if not set
|
|
*/
|
|
void *ocxl_afu_get_private(struct ocxl_afu *afu);
|
|
|
|
// Global MMIO
|
|
/**
|
|
* ocxl_global_mmio_read32() - Read a 32 bit value from global MMIO
|
|
* @afu: The AFU
|
|
* @offset: The Offset from the start of MMIO
|
|
* @endian: the endianness that the MMIO data is in
|
|
* @val: returns the value
|
|
*
|
|
* Returns 0 for success, negative on error
|
|
*/
|
|
int ocxl_global_mmio_read32(struct ocxl_afu *afu, size_t offset,
|
|
enum ocxl_endian endian, u32 *val);
|
|
|
|
/**
|
|
* ocxl_global_mmio_read64() - Read a 64 bit value from global MMIO
|
|
* @afu: The AFU
|
|
* @offset: The Offset from the start of MMIO
|
|
* @endian: the endianness that the MMIO data is in
|
|
* @val: returns the value
|
|
*
|
|
* Returns 0 for success, negative on error
|
|
*/
|
|
int ocxl_global_mmio_read64(struct ocxl_afu *afu, size_t offset,
|
|
enum ocxl_endian endian, u64 *val);
|
|
|
|
/**
|
|
* ocxl_global_mmio_write32() - Write a 32 bit value to global MMIO
|
|
* @afu: The AFU
|
|
* @offset: The Offset from the start of MMIO
|
|
* @endian: the endianness that the MMIO data is in
|
|
* @val: The value to write
|
|
*
|
|
* Returns 0 for success, negative on error
|
|
*/
|
|
int ocxl_global_mmio_write32(struct ocxl_afu *afu, size_t offset,
|
|
enum ocxl_endian endian, u32 val);
|
|
|
|
/**
|
|
* ocxl_global_mmio_write64() - Write a 64 bit value to global MMIO
|
|
* @afu: The AFU
|
|
* @offset: The Offset from the start of MMIO
|
|
* @endian: the endianness that the MMIO data is in
|
|
* @val: The value to write
|
|
*
|
|
* Returns 0 for success, negative on error
|
|
*/
|
|
int ocxl_global_mmio_write64(struct ocxl_afu *afu, size_t offset,
|
|
enum ocxl_endian endian, u64 val);
|
|
|
|
/**
|
|
* ocxl_global_mmio_set32() - Set bits in a 32 bit global MMIO register
|
|
* @afu: The AFU
|
|
* @offset: The Offset from the start of MMIO
|
|
* @endian: the endianness that the MMIO data is in
|
|
* @mask: a mask of the bits to set
|
|
*
|
|
* Returns 0 for success, negative on error
|
|
*/
|
|
int ocxl_global_mmio_set32(struct ocxl_afu *afu, size_t offset,
|
|
enum ocxl_endian endian, u32 mask);
|
|
|
|
/**
|
|
* ocxl_global_mmio_set64() - Set bits in a 64 bit global MMIO register
|
|
* @afu: The AFU
|
|
* @offset: The Offset from the start of MMIO
|
|
* @endian: the endianness that the MMIO data is in
|
|
* @mask: a mask of the bits to set
|
|
*
|
|
* Returns 0 for success, negative on error
|
|
*/
|
|
int ocxl_global_mmio_set64(struct ocxl_afu *afu, size_t offset,
|
|
enum ocxl_endian endian, u64 mask);
|
|
|
|
/**
|
|
* ocxl_global_mmio_clear32() - Set bits in a 32 bit global MMIO register
|
|
* @afu: The AFU
|
|
* @offset: The Offset from the start of MMIO
|
|
* @endian: the endianness that the MMIO data is in
|
|
* @mask: a mask of the bits to set
|
|
*
|
|
* Returns 0 for success, negative on error
|
|
*/
|
|
int ocxl_global_mmio_clear32(struct ocxl_afu *afu, size_t offset,
|
|
enum ocxl_endian endian, u32 mask);
|
|
|
|
/**
|
|
* ocxl_global_mmio_clear64() - Set bits in a 64 bit global MMIO register
|
|
* @afu: The AFU
|
|
* @offset: The Offset from the start of MMIO
|
|
* @endian: the endianness that the MMIO data is in
|
|
* @mask: a mask of the bits to set
|
|
*
|
|
* Returns 0 for success, negative on error
|
|
*/
|
|
int ocxl_global_mmio_clear64(struct ocxl_afu *afu, size_t offset,
|
|
enum ocxl_endian endian, u64 mask);
|
|
|
|
// Functions left here are for compatibility with the cxlflash driver
|
|
|
|
/*
|
|
* Read the configuration space of a function for the AFU specified by
|
|
* the index 'afu_idx'. Fills in a ocxl_afu_config structure
|
|
*/
|
|
int ocxl_config_read_afu(struct pci_dev *dev,
|
|
struct ocxl_fn_config *fn,
|
|
struct ocxl_afu_config *afu,
|
|
u8 afu_idx);
|
|
|
|
/*
|
|
* Tell an AFU, by writing in the configuration space, the PASIDs that
|
|
* it can use. Range starts at 'pasid_base' and its size is a multiple
|
|
* of 2
|
|
*
|
|
* 'afu_control_offset' is the offset of the AFU control DVSEC which
|
|
* can be found in the function configuration
|
|
*/
|
|
void ocxl_config_set_afu_pasid(struct pci_dev *dev,
|
|
int afu_control_offset,
|
|
int pasid_base, u32 pasid_count_log);
|
|
|
|
/*
|
|
* Get the actag configuration for the function:
|
|
* 'base' is the first actag value that can be used.
|
|
* 'enabled' it the number of actags available, starting from base.
|
|
* 'supported' is the total number of actags desired by all the AFUs
|
|
* of the function.
|
|
*/
|
|
int ocxl_config_get_actag_info(struct pci_dev *dev,
|
|
u16 *base, u16 *enabled, u16 *supported);
|
|
|
|
/*
|
|
* Tell a function, by writing in the configuration space, the actags
|
|
* it can use.
|
|
*
|
|
* 'func_offset' is the offset of the Function DVSEC that can found in
|
|
* the function configuration
|
|
*/
|
|
void ocxl_config_set_actag(struct pci_dev *dev, int func_offset,
|
|
u32 actag_base, u32 actag_count);
|
|
|
|
/*
|
|
* Tell an AFU, by writing in the configuration space, the actags it
|
|
* can use.
|
|
*
|
|
* 'afu_control_offset' is the offset of the AFU control DVSEC for the
|
|
* desired AFU. It can be found in the AFU configuration
|
|
*/
|
|
void ocxl_config_set_afu_actag(struct pci_dev *dev,
|
|
int afu_control_offset,
|
|
int actag_base, int actag_count);
|
|
|
|
/*
|
|
* Enable/disable an AFU, by writing in the configuration space.
|
|
*
|
|
* 'afu_control_offset' is the offset of the AFU control DVSEC for the
|
|
* desired AFU. It can be found in the AFU configuration
|
|
*/
|
|
void ocxl_config_set_afu_state(struct pci_dev *dev,
|
|
int afu_control_offset, int enable);
|
|
|
|
/*
|
|
* Set the Transaction Layer configuration in the configuration space.
|
|
* Only needed for function 0.
|
|
*
|
|
* It queries the host TL capabilities, find some common ground
|
|
* between the host and device, and set the Transaction Layer on both
|
|
* accordingly.
|
|
*/
|
|
int ocxl_config_set_TL(struct pci_dev *dev, int tl_dvsec);
|
|
|
|
/*
|
|
* Request an AFU to terminate a PASID.
|
|
* Will return once the AFU has acked the request, or an error in case
|
|
* of timeout.
|
|
*
|
|
* The hardware can only terminate one PASID at a time, so caller must
|
|
* guarantee some kind of serialization.
|
|
*
|
|
* 'afu_control_offset' is the offset of the AFU control DVSEC for the
|
|
* desired AFU. It can be found in the AFU configuration
|
|
*/
|
|
int ocxl_config_terminate_pasid(struct pci_dev *dev,
|
|
int afu_control_offset, int pasid);
|
|
|
|
/*
|
|
* Read the configuration space of a function and fill in a
|
|
* ocxl_fn_config structure with all the function details
|
|
*/
|
|
int ocxl_config_read_function(struct pci_dev *dev,
|
|
struct ocxl_fn_config *fn);
|
|
|
|
/*
|
|
* Set up the opencapi link for the function.
|
|
*
|
|
* When called for the first time for a link, it sets up the Shared
|
|
* Process Area for the link and the interrupt handler to process
|
|
* translation faults.
|
|
*
|
|
* Returns a 'link handle' that should be used for further calls for
|
|
* the link
|
|
*/
|
|
int ocxl_link_setup(struct pci_dev *dev, int PE_mask,
|
|
void **link_handle);
|
|
|
|
/*
|
|
* Remove the association between the function and its link.
|
|
*/
|
|
void ocxl_link_release(struct pci_dev *dev, void *link_handle);
|
|
|
|
/*
|
|
* Add a Process Element to the Shared Process Area for a link.
|
|
* The process is defined by its PASID, pid, tid and its mm_struct.
|
|
*
|
|
* 'xsl_err_cb' is an optional callback if the driver wants to be
|
|
* notified when the translation fault interrupt handler detects an
|
|
* address error.
|
|
* 'xsl_err_data' is an argument passed to the above callback, if
|
|
* defined
|
|
*/
|
|
int ocxl_link_add_pe(void *link_handle, int pasid, u32 pidr, u32 tidr,
|
|
u64 amr, struct mm_struct *mm,
|
|
void (*xsl_err_cb)(void *data, u64 addr, u64 dsisr),
|
|
void *xsl_err_data);
|
|
|
|
/*
|
|
* Remove a Process Element from the Shared Process Area for a link
|
|
*/
|
|
int ocxl_link_remove_pe(void *link_handle, int pasid);
|
|
|
|
/*
|
|
* Allocate an AFU interrupt associated to the link.
|
|
*
|
|
* 'hw_irq' is the hardware interrupt number
|
|
* 'obj_handle' is the 64-bit object handle to be passed to the AFU to
|
|
* trigger the interrupt.
|
|
* On P9, 'obj_handle' is an address, which, if written, triggers the
|
|
* interrupt. It is an MMIO address which needs to be remapped (one
|
|
* page).
|
|
*/
|
|
int ocxl_link_irq_alloc(void *link_handle, int *hw_irq,
|
|
u64 *obj_handle);
|
|
|
|
/*
|
|
* Free a previously allocated AFU interrupt
|
|
*/
|
|
void ocxl_link_free_irq(void *link_handle, int hw_irq);
|
|
|
|
#endif /* _MISC_OCXL_H_ */
|