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linux-next/include/linux/pci-epc.h
Rick Wertenbroek 28b6acd75e
PCI: endpoint: Fix pci_epc_map map_size kerneldoc string 
Because some endpoint controllers have requirements on the alignment of
the controller physical memory address that must be used to map a RC PCI
address region, the map PCI start address is not necessarily the desired
PCI base address to be mapped. This can result in map_pci_addr being
lower than pci_addr as documented. This results in map_size covering the
range map_pci_addr..pci_addr+pci_size.

The old text had the pci_addr twice instead of map_pci_addr..pci_addr,
so replace the erroneous kerneldoc string to reflect the actual range.

Link: https://lore.kernel.org/r/20241114161032.3046202-1-rick.wertenbroek@gmail.com
Signed-off-by: Rick Wertenbroek <rick.wertenbroek@gmail.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
2024-11-18 17:18:21 +00:00

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/* SPDX-License-Identifier: GPL-2.0 */
/*
* PCI Endpoint *Controller* (EPC) header file
*
* Copyright (C) 2017 Texas Instruments
* Author: Kishon Vijay Abraham I <kishon@ti.com>
*/
#ifndef __LINUX_PCI_EPC_H
#define __LINUX_PCI_EPC_H
#include <linux/pci-epf.h>
struct pci_epc;
enum pci_epc_interface_type {
UNKNOWN_INTERFACE = -1,
PRIMARY_INTERFACE,
SECONDARY_INTERFACE,
};
static inline const char *
pci_epc_interface_string(enum pci_epc_interface_type type)
{
switch (type) {
case PRIMARY_INTERFACE:
return "primary";
case SECONDARY_INTERFACE:
return "secondary";
default:
return "UNKNOWN interface";
}
}
/**
* struct pci_epc_map - information about EPC memory for mapping a RC PCI
* address range
* @pci_addr: start address of the RC PCI address range to map
* @pci_size: size of the RC PCI address range mapped from @pci_addr
* @map_pci_addr: RC PCI address used as the first address mapped (may be lower
* than @pci_addr)
* @map_size: size of the controller memory needed for mapping the RC PCI address
* range @map_pci_addr..@pci_addr+@pci_size
* @phys_base: base physical address of the allocated EPC memory for mapping the
* RC PCI address range
* @phys_addr: physical address at which @pci_addr is mapped
* @virt_base: base virtual address of the allocated EPC memory for mapping the
* RC PCI address range
* @virt_addr: virtual address at which @pci_addr is mapped
*/
struct pci_epc_map {
u64 pci_addr;
size_t pci_size;
u64 map_pci_addr;
size_t map_size;
phys_addr_t phys_base;
phys_addr_t phys_addr;
void __iomem *virt_base;
void __iomem *virt_addr;
};
/**
* struct pci_epc_ops - set of function pointers for performing EPC operations
* @write_header: ops to populate configuration space header
* @set_bar: ops to configure the BAR
* @clear_bar: ops to reset the BAR
* @align_addr: operation to get the mapping address, mapping size and offset
* into a controller memory window needed to map an RC PCI address
* region
* @map_addr: ops to map CPU address to PCI address
* @unmap_addr: ops to unmap CPU address and PCI address
* @set_msi: ops to set the requested number of MSI interrupts in the MSI
* capability register
* @get_msi: ops to get the number of MSI interrupts allocated by the RC from
* the MSI capability register
* @set_msix: ops to set the requested number of MSI-X interrupts in the
* MSI-X capability register
* @get_msix: ops to get the number of MSI-X interrupts allocated by the RC
* from the MSI-X capability register
* @raise_irq: ops to raise a legacy, MSI or MSI-X interrupt
* @map_msi_irq: ops to map physical address to MSI address and return MSI data
* @start: ops to start the PCI link
* @stop: ops to stop the PCI link
* @get_features: ops to get the features supported by the EPC
* @owner: the module owner containing the ops
*/
struct pci_epc_ops {
int (*write_header)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_header *hdr);
int (*set_bar)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_bar *epf_bar);
void (*clear_bar)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_bar *epf_bar);
u64 (*align_addr)(struct pci_epc *epc, u64 pci_addr, size_t *size,
size_t *offset);
int (*map_addr)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t addr, u64 pci_addr, size_t size);
void (*unmap_addr)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t addr);
int (*set_msi)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
u8 interrupts);
int (*get_msi)(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
int (*set_msix)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
u16 interrupts, enum pci_barno, u32 offset);
int (*get_msix)(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
int (*raise_irq)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
unsigned int type, u16 interrupt_num);
int (*map_msi_irq)(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t phys_addr, u8 interrupt_num,
u32 entry_size, u32 *msi_data,
u32 *msi_addr_offset);
int (*start)(struct pci_epc *epc);
void (*stop)(struct pci_epc *epc);
const struct pci_epc_features* (*get_features)(struct pci_epc *epc,
u8 func_no, u8 vfunc_no);
struct module *owner;
};
/**
* struct pci_epc_mem_window - address window of the endpoint controller
* @phys_base: physical base address of the PCI address window
* @size: the size of the PCI address window
* @page_size: size of each page
*/
struct pci_epc_mem_window {
phys_addr_t phys_base;
size_t size;
size_t page_size;
};
/**
* struct pci_epc_mem - address space of the endpoint controller
* @window: address window of the endpoint controller
* @bitmap: bitmap to manage the PCI address space
* @pages: number of bits representing the address region
* @lock: mutex to protect bitmap
*/
struct pci_epc_mem {
struct pci_epc_mem_window window;
unsigned long *bitmap;
int pages;
/* mutex to protect against concurrent access for memory allocation*/
struct mutex lock;
};
/**
* struct pci_epc - represents the PCI EPC device
* @dev: PCI EPC device
* @pci_epf: list of endpoint functions present in this EPC device
* @list_lock: Mutex for protecting pci_epf list
* @ops: function pointers for performing endpoint operations
* @windows: array of address space of the endpoint controller
* @mem: first window of the endpoint controller, which corresponds to
* default address space of the endpoint controller supporting
* single window.
* @num_windows: number of windows supported by device
* @max_functions: max number of functions that can be configured in this EPC
* @max_vfs: Array indicating the maximum number of virtual functions that can
* be associated with each physical function
* @group: configfs group representing the PCI EPC device
* @lock: mutex to protect pci_epc ops
* @function_num_map: bitmap to manage physical function number
* @domain_nr: PCI domain number of the endpoint controller
* @init_complete: flag to indicate whether the EPC initialization is complete
* or not
*/
struct pci_epc {
struct device dev;
struct list_head pci_epf;
struct mutex list_lock;
const struct pci_epc_ops *ops;
struct pci_epc_mem **windows;
struct pci_epc_mem *mem;
unsigned int num_windows;
u8 max_functions;
u8 *max_vfs;
struct config_group *group;
/* mutex to protect against concurrent access of EP controller */
struct mutex lock;
unsigned long function_num_map;
int domain_nr;
bool init_complete;
};
/**
* enum pci_epc_bar_type - configurability of endpoint BAR
* @BAR_PROGRAMMABLE: The BAR mask can be configured by the EPC.
* @BAR_FIXED: The BAR mask is fixed by the hardware.
* @BAR_RESERVED: The BAR should not be touched by an EPF driver.
*/
enum pci_epc_bar_type {
BAR_PROGRAMMABLE = 0,
BAR_FIXED,
BAR_RESERVED,
};
/**
* struct pci_epc_bar_desc - hardware description for a BAR
* @type: the type of the BAR
* @fixed_size: the fixed size, only applicable if type is BAR_FIXED_MASK.
* @only_64bit: if true, an EPF driver is not allowed to choose if this BAR
* should be configured as 32-bit or 64-bit, the EPF driver must
* configure this BAR as 64-bit. Additionally, the BAR succeeding
* this BAR must be set to type BAR_RESERVED.
*
* only_64bit should not be set on a BAR of type BAR_RESERVED.
* (If BARx is a 64-bit BAR that an EPF driver is not allowed to
* touch, then both BARx and BARx+1 must be set to type
* BAR_RESERVED.)
*/
struct pci_epc_bar_desc {
enum pci_epc_bar_type type;
u64 fixed_size;
bool only_64bit;
};
/**
* struct pci_epc_features - features supported by a EPC device per function
* @linkup_notifier: indicate if the EPC device can notify EPF driver on link up
* @msi_capable: indicate if the endpoint function has MSI capability
* @msix_capable: indicate if the endpoint function has MSI-X capability
* @bar: array specifying the hardware description for each BAR
* @align: alignment size required for BAR buffer allocation
*/
struct pci_epc_features {
unsigned int linkup_notifier : 1;
unsigned int msi_capable : 1;
unsigned int msix_capable : 1;
struct pci_epc_bar_desc bar[PCI_STD_NUM_BARS];
size_t align;
};
#define to_pci_epc(device) container_of((device), struct pci_epc, dev)
#ifdef CONFIG_PCI_ENDPOINT
#define pci_epc_create(dev, ops) \
__pci_epc_create((dev), (ops), THIS_MODULE)
#define devm_pci_epc_create(dev, ops) \
__devm_pci_epc_create((dev), (ops), THIS_MODULE)
static inline void epc_set_drvdata(struct pci_epc *epc, void *data)
{
dev_set_drvdata(&epc->dev, data);
}
static inline void *epc_get_drvdata(struct pci_epc *epc)
{
return dev_get_drvdata(&epc->dev);
}
struct pci_epc *
__devm_pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
struct module *owner);
struct pci_epc *
__pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
struct module *owner);
void devm_pci_epc_destroy(struct device *dev, struct pci_epc *epc);
void pci_epc_destroy(struct pci_epc *epc);
int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf,
enum pci_epc_interface_type type);
void pci_epc_linkup(struct pci_epc *epc);
void pci_epc_linkdown(struct pci_epc *epc);
void pci_epc_init_notify(struct pci_epc *epc);
void pci_epc_notify_pending_init(struct pci_epc *epc, struct pci_epf *epf);
void pci_epc_deinit_notify(struct pci_epc *epc);
void pci_epc_bus_master_enable_notify(struct pci_epc *epc);
void pci_epc_remove_epf(struct pci_epc *epc, struct pci_epf *epf,
enum pci_epc_interface_type type);
int pci_epc_write_header(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_header *hdr);
int pci_epc_set_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_bar *epf_bar);
void pci_epc_clear_bar(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epf_bar *epf_bar);
int pci_epc_map_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t phys_addr,
u64 pci_addr, size_t size);
void pci_epc_unmap_addr(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t phys_addr);
int pci_epc_set_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
u8 interrupts);
int pci_epc_get_msi(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
int pci_epc_set_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
u16 interrupts, enum pci_barno, u32 offset);
int pci_epc_get_msix(struct pci_epc *epc, u8 func_no, u8 vfunc_no);
int pci_epc_map_msi_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
phys_addr_t phys_addr, u8 interrupt_num,
u32 entry_size, u32 *msi_data, u32 *msi_addr_offset);
int pci_epc_raise_irq(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
unsigned int type, u16 interrupt_num);
int pci_epc_start(struct pci_epc *epc);
void pci_epc_stop(struct pci_epc *epc);
const struct pci_epc_features *pci_epc_get_features(struct pci_epc *epc,
u8 func_no, u8 vfunc_no);
enum pci_barno
pci_epc_get_first_free_bar(const struct pci_epc_features *epc_features);
enum pci_barno pci_epc_get_next_free_bar(const struct pci_epc_features
*epc_features, enum pci_barno bar);
struct pci_epc *pci_epc_get(const char *epc_name);
void pci_epc_put(struct pci_epc *epc);
int pci_epc_mem_init(struct pci_epc *epc, phys_addr_t base,
size_t size, size_t page_size);
int pci_epc_multi_mem_init(struct pci_epc *epc,
struct pci_epc_mem_window *window,
unsigned int num_windows);
void pci_epc_mem_exit(struct pci_epc *epc);
void __iomem *pci_epc_mem_alloc_addr(struct pci_epc *epc,
phys_addr_t *phys_addr, size_t size);
void pci_epc_mem_free_addr(struct pci_epc *epc, phys_addr_t phys_addr,
void __iomem *virt_addr, size_t size);
int pci_epc_mem_map(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
u64 pci_addr, size_t pci_size, struct pci_epc_map *map);
void pci_epc_mem_unmap(struct pci_epc *epc, u8 func_no, u8 vfunc_no,
struct pci_epc_map *map);
#else
static inline void pci_epc_init_notify(struct pci_epc *epc)
{
}
static inline void pci_epc_deinit_notify(struct pci_epc *epc)
{
}
#endif /* CONFIG_PCI_ENDPOINT */
#endif /* __LINUX_PCI_EPC_H */
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