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ntb.h
/* * This file is provided under a dual BSD/GPLv2 license. When using or * redistributing this file, you may do so under either license. * * GPL LICENSE SUMMARY * * Copyright (C) 2015 EMC Corporation. All Rights Reserved. * Copyright (C) 2016 T-Platforms. All Rights Reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * BSD LICENSE * * Copyright (C) 2015 EMC Corporation. All Rights Reserved. * Copyright (C) 2016 T-Platforms. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copy * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * PCIe NTB Linux driver * * Contact Information: * Allen Hubbe <Allen.Hubbe@emc.com> */ #ifndef _NTB_H_ #define _NTB_H_ #include <linux/completion.h> #include <linux/device.h> #include <linux/interrupt.h> struct ntb_client; struct ntb_dev; struct ntb_msi; struct pci_dev; /** * enum ntb_topo - NTB connection topology * @NTB_TOPO_NONE: Topology is unknown or invalid. * @NTB_TOPO_PRI: On primary side of local ntb. * @NTB_TOPO_SEC: On secondary side of remote ntb. * @NTB_TOPO_B2B_USD: On primary side of local ntb upstream of remote ntb. * @NTB_TOPO_B2B_DSD: On primary side of local ntb downstream of remote ntb. * @NTB_TOPO_SWITCH: Connected via a switch which supports ntb. * @NTB_TOPO_CROSSLINK: Connected via two symmetric switchecs */ enum ntb_topo { NTB_TOPO_NONE = -1, NTB_TOPO_PRI, NTB_TOPO_SEC, NTB_TOPO_B2B_USD, NTB_TOPO_B2B_DSD, NTB_TOPO_SWITCH, NTB_TOPO_CROSSLINK, }; static inline int ntb_topo_is_b2b(enum ntb_topo topo) { switch ((int)topo) { case NTB_TOPO_B2B_USD: case NTB_TOPO_B2B_DSD: return 1; } return 0; } static inline char *ntb_topo_string(enum ntb_topo topo) { switch (topo) { case NTB_TOPO_NONE: return "NTB_TOPO_NONE"; case NTB_TOPO_PRI: return "NTB_TOPO_PRI"; case NTB_TOPO_SEC: return "NTB_TOPO_SEC"; case NTB_TOPO_B2B_USD: return "NTB_TOPO_B2B_USD"; case NTB_TOPO_B2B_DSD: return "NTB_TOPO_B2B_DSD"; case NTB_TOPO_SWITCH: return "NTB_TOPO_SWITCH"; case NTB_TOPO_CROSSLINK: return "NTB_TOPO_CROSSLINK"; } return "NTB_TOPO_INVALID"; } /** * enum ntb_speed - NTB link training speed * @NTB_SPEED_AUTO: Request the max supported speed. * @NTB_SPEED_NONE: Link is not trained to any speed. * @NTB_SPEED_GEN1: Link is trained to gen1 speed. * @NTB_SPEED_GEN2: Link is trained to gen2 speed. * @NTB_SPEED_GEN3: Link is trained to gen3 speed. * @NTB_SPEED_GEN4: Link is trained to gen4 speed. */ enum ntb_speed { NTB_SPEED_AUTO = -1, NTB_SPEED_NONE = 0, NTB_SPEED_GEN1 = 1, NTB_SPEED_GEN2 = 2, NTB_SPEED_GEN3 = 3, NTB_SPEED_GEN4 = 4 }; /** * enum ntb_width - NTB link training width * @NTB_WIDTH_AUTO: Request the max supported width. * @NTB_WIDTH_NONE: Link is not trained to any width. * @NTB_WIDTH_1: Link is trained to 1 lane width. * @NTB_WIDTH_2: Link is trained to 2 lane width. * @NTB_WIDTH_4: Link is trained to 4 lane width. * @NTB_WIDTH_8: Link is trained to 8 lane width. * @NTB_WIDTH_12: Link is trained to 12 lane width. * @NTB_WIDTH_16: Link is trained to 16 lane width. * @NTB_WIDTH_32: Link is trained to 32 lane width. */ enum ntb_width { NTB_WIDTH_AUTO = -1, NTB_WIDTH_NONE = 0, NTB_WIDTH_1 = 1, NTB_WIDTH_2 = 2, NTB_WIDTH_4 = 4, NTB_WIDTH_8 = 8, NTB_WIDTH_12 = 12, NTB_WIDTH_16 = 16, NTB_WIDTH_32 = 32, }; /** * enum ntb_default_port - NTB default port number * @NTB_PORT_PRI_USD: Default port of the NTB_TOPO_PRI/NTB_TOPO_B2B_USD * topologies * @NTB_PORT_SEC_DSD: Default port of the NTB_TOPO_SEC/NTB_TOPO_B2B_DSD * topologies */ enum ntb_default_port { NTB_PORT_PRI_USD, NTB_PORT_SEC_DSD }; #define NTB_DEF_PEER_CNT (1) #define NTB_DEF_PEER_IDX (0) /** * struct ntb_client_ops - ntb client operations * @probe: Notify client of a new device. * @remove: Notify client to remove a device. */ struct ntb_client_ops { int (*probe)(struct ntb_client *client, struct ntb_dev *ntb); void (*remove)(struct ntb_client *client, struct ntb_dev *ntb); }; static inline int ntb_client_ops_is_valid(const struct ntb_client_ops *ops) { /* commented callbacks are not required: */ return ops->probe && ops->remove && 1; } /** * struct ntb_ctx_ops - ntb driver context operations * @link_event: See ntb_link_event(). * @db_event: See ntb_db_event(). * @msg_event: See ntb_msg_event(). */ struct ntb_ctx_ops { void (*link_event)(void *ctx); void (*db_event)(void *ctx, int db_vector); void (*msg_event)(void *ctx); }; static inline int ntb_ctx_ops_is_valid(const struct ntb_ctx_ops *ops) { /* commented callbacks are not required: */ return /* ops->link_event && */ /* ops->db_event && */ /* ops->msg_event && */ 1; } /** * struct ntb_dev_ops - ntb device operations * @port_number: See ntb_port_number(). * @peer_port_count: See ntb_peer_port_count(). * @peer_port_number: See ntb_peer_port_number(). * @peer_port_idx: See ntb_peer_port_idx(). * @link_is_up: See ntb_link_is_up(). * @link_enable: See ntb_link_enable(). * @link_disable: See ntb_link_disable(). * @mw_count: See ntb_mw_count(). * @mw_get_align: See ntb_mw_get_align(). * @mw_set_trans: See ntb_mw_set_trans(). * @mw_clear_trans: See ntb_mw_clear_trans(). * @peer_mw_count: See ntb_peer_mw_count(). * @peer_mw_get_addr: See ntb_peer_mw_get_addr(). * @peer_mw_set_trans: See ntb_peer_mw_set_trans(). * @peer_mw_clear_trans:See ntb_peer_mw_clear_trans(). * @db_is_unsafe: See ntb_db_is_unsafe(). * @db_valid_mask: See ntb_db_valid_mask(). * @db_vector_count: See ntb_db_vector_count(). * @db_vector_mask: See ntb_db_vector_mask(). * @db_read: See ntb_db_read(). * @db_set: See ntb_db_set(). * @db_clear: See ntb_db_clear(). * @db_read_mask: See ntb_db_read_mask(). * @db_set_mask: See ntb_db_set_mask(). * @db_clear_mask: See ntb_db_clear_mask(). * @peer_db_addr: See ntb_peer_db_addr(). * @peer_db_read: See ntb_peer_db_read(). * @peer_db_set: See ntb_peer_db_set(). * @peer_db_clear: See ntb_peer_db_clear(). * @peer_db_read_mask: See ntb_peer_db_read_mask(). * @peer_db_set_mask: See ntb_peer_db_set_mask(). * @peer_db_clear_mask: See ntb_peer_db_clear_mask(). * @spad_is_unsafe: See ntb_spad_is_unsafe(). * @spad_count: See ntb_spad_count(). * @spad_read: See ntb_spad_read(). * @spad_write: See ntb_spad_write(). * @peer_spad_addr: See ntb_peer_spad_addr(). * @peer_spad_read: See ntb_peer_spad_read(). * @peer_spad_write: See ntb_peer_spad_write(). * @msg_count: See ntb_msg_count(). * @msg_inbits: See ntb_msg_inbits(). * @msg_outbits: See ntb_msg_outbits(). * @msg_read_sts: See ntb_msg_read_sts(). * @msg_clear_sts: See ntb_msg_clear_sts(). * @msg_set_mask: See ntb_msg_set_mask(). * @msg_clear_mask: See ntb_msg_clear_mask(). * @msg_read: See ntb_msg_read(). * @peer_msg_write: See ntb_peer_msg_write(). */ struct ntb_dev_ops { int (*port_number)(struct ntb_dev *ntb); int (*peer_port_count)(struct ntb_dev *ntb); int (*peer_port_number)(struct ntb_dev *ntb, int pidx); int (*peer_port_idx)(struct ntb_dev *ntb, int port); u64 (*link_is_up)(struct ntb_dev *ntb, enum ntb_speed *speed, enum ntb_width *width); int (*link_enable)(struct ntb_dev *ntb, enum ntb_speed max_speed, enum ntb_width max_width); int (*link_disable)(struct ntb_dev *ntb); int (*mw_count)(struct ntb_dev *ntb, int pidx); int (*mw_get_align)(struct ntb_dev *ntb, int pidx, int widx, resource_size_t *addr_align, resource_size_t *size_align, resource_size_t *size_max); int (*mw_set_trans)(struct ntb_dev *ntb, int pidx, int widx, dma_addr_t addr, resource_size_t size); int (*mw_clear_trans)(struct ntb_dev *ntb, int pidx, int widx); int (*peer_mw_count)(struct ntb_dev *ntb); int (*peer_mw_get_addr)(struct ntb_dev *ntb, int widx, phys_addr_t *base, resource_size_t *size); int (*peer_mw_set_trans)(struct ntb_dev *ntb, int pidx, int widx, u64 addr, resource_size_t size); int (*peer_mw_clear_trans)(struct ntb_dev *ntb, int pidx, int widx); int (*db_is_unsafe)(struct ntb_dev *ntb); u64 (*db_valid_mask)(struct ntb_dev *ntb); int (*db_vector_count)(struct ntb_dev *ntb); u64 (*db_vector_mask)(struct ntb_dev *ntb, int db_vector); u64 (*db_read)(struct ntb_dev *ntb); int (*db_set)(struct ntb_dev *ntb, u64 db_bits); int (*db_clear)(struct ntb_dev *ntb, u64 db_bits); u64 (*db_read_mask)(struct ntb_dev *ntb); int (*db_set_mask)(struct ntb_dev *ntb, u64 db_bits); int (*db_clear_mask)(struct ntb_dev *ntb, u64 db_bits); int (*peer_db_addr)(struct ntb_dev *ntb, phys_addr_t *db_addr, resource_size_t *db_size, u64 *db_data, int db_bit); u64 (*peer_db_read)(struct ntb_dev *ntb); int (*peer_db_set)(struct ntb_dev *ntb, u64 db_bits); int (*peer_db_clear)(struct ntb_dev *ntb, u64 db_bits); u64 (*peer_db_read_mask)(struct ntb_dev *ntb); int (*peer_db_set_mask)(struct ntb_dev *ntb, u64 db_bits); int (*peer_db_clear_mask)(struct ntb_dev *ntb, u64 db_bits); int (*spad_is_unsafe)(struct ntb_dev *ntb); int (*spad_count)(struct ntb_dev *ntb); u32 (*spad_read)(struct ntb_dev *ntb, int sidx); int (*spad_write)(struct ntb_dev *ntb, int sidx, u32 val); int (*peer_spad_addr)(struct ntb_dev *ntb, int pidx, int sidx, phys_addr_t *spad_addr); u32 (*peer_spad_read)(struct ntb_dev *ntb, int pidx, int sidx); int (*peer_spad_write)(struct ntb_dev *ntb, int pidx, int sidx, u32 val); int (*msg_count)(struct ntb_dev *ntb); u64 (*msg_inbits)(struct ntb_dev *ntb); u64 (*msg_outbits)(struct ntb_dev *ntb); u64 (*msg_read_sts)(struct ntb_dev *ntb); int (*msg_clear_sts)(struct ntb_dev *ntb, u64 sts_bits); int (*msg_set_mask)(struct ntb_dev *ntb, u64 mask_bits); int (*msg_clear_mask)(struct ntb_dev *ntb, u64 mask_bits); u32 (*msg_read)(struct ntb_dev *ntb, int *pidx, int midx); int (*peer_msg_write)(struct ntb_dev *ntb, int pidx, int midx, u32 msg); }; static inline int ntb_dev_ops_is_valid(const struct ntb_dev_ops *ops) { /* commented callbacks are not required: */ return /* Port operations are required for multiport devices */ !ops->peer_port_count == !ops->port_number && !ops->peer_port_number == !ops->port_number && !ops->peer_port_idx == !ops->port_number && /* Link operations are required */ ops->link_is_up && ops->link_enable && ops->link_disable && /* One or both MW interfaces should be developed */ ops->mw_count && ops->mw_get_align && (ops->mw_set_trans || ops->peer_mw_set_trans) && /* ops->mw_clear_trans && */ ops->peer_mw_count && ops->peer_mw_get_addr && /* ops->peer_mw_clear_trans && */ /* Doorbell operations are mostly required */ /* ops->db_is_unsafe && */ ops->db_valid_mask && /* both set, or both unset */ (!ops->db_vector_count == !ops->db_vector_mask) && ops->db_read && /* ops->db_set && */ ops->db_clear && /* ops->db_read_mask && */ ops->db_set_mask && ops->db_clear_mask && /* ops->peer_db_addr && */ /* ops->peer_db_read && */ ops->peer_db_set && /* ops->peer_db_clear && */ /* ops->peer_db_read_mask && */ /* ops->peer_db_set_mask && */ /* ops->peer_db_clear_mask && */ /* Scrachpads interface is optional */ /* !ops->spad_is_unsafe == !ops->spad_count && */ !ops->spad_read == !ops->spad_count && !ops->spad_write == !ops->spad_count && /* !ops->peer_spad_addr == !ops->spad_count && */ /* !ops->peer_spad_read == !ops->spad_count && */ !ops->peer_spad_write == !ops->spad_count && /* Messaging interface is optional */ !ops->msg_inbits == !ops->msg_count && !ops->msg_outbits == !ops->msg_count && !ops->msg_read_sts == !ops->msg_count && !ops->msg_clear_sts == !ops->msg_count && /* !ops->msg_set_mask == !ops->msg_count && */ /* !ops->msg_clear_mask == !ops->msg_count && */ !ops->msg_read == !ops->msg_count && !ops->peer_msg_write == !ops->msg_count && 1; } /** * struct ntb_client - client interested in ntb devices * @drv: Linux driver object. * @ops: See &ntb_client_ops. */ struct ntb_client { struct device_driver drv; const struct ntb_client_ops ops; }; #define drv_ntb_client(__drv) container_of((__drv), struct ntb_client, drv) /** * struct ntb_dev - ntb device * @dev: Linux device object. * @pdev: PCI device entry of the ntb. * @topo: Detected topology of the ntb. * @ops: See &ntb_dev_ops. * @ctx: See &ntb_ctx_ops. * @ctx_ops: See &ntb_ctx_ops. */ struct ntb_dev { struct device dev; struct pci_dev *pdev; enum ntb_topo topo; const struct ntb_dev_ops *ops; void *ctx; const struct ntb_ctx_ops *ctx_ops; /* private: */ /* synchronize setting, clearing, and calling ctx_ops */ spinlock_t ctx_lock; /* block unregister until device is fully released */ struct completion released; #ifdef CONFIG_NTB_MSI struct ntb_msi *msi; #endif }; #define dev_ntb(__dev) container_of((__dev), struct ntb_dev, dev) /** * ntb_register_client() - register a client for interest in ntb devices * @client: Client context. * * The client will be added to the list of clients interested in ntb devices. * The client will be notified of any ntb devices that are not already * associated with a client, or if ntb devices are registered later. * * Return: Zero if the client is registered, otherwise an error number. */ #define ntb_register_client(client) \ __ntb_register_client((client), THIS_MODULE, KBUILD_MODNAME) int __ntb_register_client(struct ntb_client *client, struct module *mod, const char *mod_name); /** * ntb_unregister_client() - unregister a client for interest in ntb devices * @client: Client context. * * The client will be removed from the list of clients interested in ntb * devices. If any ntb devices are associated with the client, the client will * be notified to remove those devices. */ void ntb_unregister_client(struct ntb_client *client); #define module_ntb_client(__ntb_client) \ module_driver(__ntb_client, ntb_register_client, \ ntb_unregister_client) /** * ntb_register_device() - register a ntb device * @ntb: NTB device context. * * The device will be added to the list of ntb devices. If any clients are * interested in ntb devices, each client will be notified of the ntb device, * until at most one client accepts the device. * * Return: Zero if the device is registered, otherwise an error number. */ int ntb_register_device(struct ntb_dev *ntb); /** * ntb_unregister_device() - unregister a ntb device * @ntb: NTB device context. * * The device will be removed from the list of ntb devices. If the ntb device * is associated with a client, the client will be notified to remove the * device. */ void ntb_unregister_device(struct ntb_dev *ntb); /** * ntb_set_ctx() - associate a driver context with an ntb device * @ntb: NTB device context. * @ctx: Driver context. * @ctx_ops: Driver context operations. * * Associate a driver context and operations with a ntb device. The context is * provided by the client driver, and the driver may associate a different * context with each ntb device. * * Return: Zero if the context is associated, otherwise an error number. */ int ntb_set_ctx(struct ntb_dev *ntb, void *ctx, const struct ntb_ctx_ops *ctx_ops); /** * ntb_clear_ctx() - disassociate any driver context from an ntb device * @ntb: NTB device context. * * Clear any association that may exist between a driver context and the ntb * device. */ void ntb_clear_ctx(struct ntb_dev *ntb); /** * ntb_link_event() - notify driver context of a change in link status * @ntb: NTB device context. * * Notify the driver context that the link status may have changed. The driver * should call ntb_link_is_up() to get the current status. */ void ntb_link_event(struct ntb_dev *ntb); /** * ntb_db_event() - notify driver context of a doorbell event * @ntb: NTB device context. * @vector: Interrupt vector number. * * Notify the driver context of a doorbell event. If hardware supports * multiple interrupt vectors for doorbells, the vector number indicates which * vector received the interrupt. The vector number is relative to the first * vector used for doorbells, starting at zero, and must be less than * ntb_db_vector_count(). The driver may call ntb_db_read() to check which * doorbell bits need service, and ntb_db_vector_mask() to determine which of * those bits are associated with the vector number. */ void ntb_db_event(struct ntb_dev *ntb, int vector); /** * ntb_msg_event() - notify driver context of a message event * @ntb: NTB device context. * * Notify the driver context of a message event. If hardware supports * message registers, this event indicates, that a new message arrived in * some incoming message register or last sent message couldn't be delivered. * The events can be masked/unmasked by the methods ntb_msg_set_mask() and * ntb_msg_clear_mask(). */ void ntb_msg_event(struct ntb_dev *ntb); /** * ntb_default_port_number() - get the default local port number * @ntb: NTB device context. * * If hardware driver doesn't specify port_number() callback method, the NTB * is considered with just two ports. So this method returns default local * port number in compliance with topology. * * NOTE Don't call this method directly. The ntb_port_number() function should * be used instead. * * Return: the default local port number */ int ntb_default_port_number(struct ntb_dev *ntb); /** * ntb_default_port_count() - get the default number of peer device ports * @ntb: NTB device context. * * By default hardware driver supports just one peer device. * * NOTE Don't call this method directly. The ntb_peer_port_count() function * should be used instead. * * Return: the default number of peer ports */ int ntb_default_peer_port_count(struct ntb_dev *ntb); /** * ntb_default_peer_port_number() - get the default peer port by given index * @ntb: NTB device context. * @idx: Peer port index (should not differ from zero). * * By default hardware driver supports just one peer device, so this method * shall return the corresponding value from enum ntb_default_port. * * NOTE Don't call this method directly. The ntb_peer_port_number() function * should be used instead. * * Return: the peer device port or negative value indicating an error */ int ntb_default_peer_port_number(struct ntb_dev *ntb, int pidx); /** * ntb_default_peer_port_idx() - get the default peer device port index by * given port number * @ntb: NTB device context. * @port: Peer port number (should be one of enum ntb_default_port). * * By default hardware driver supports just one peer device, so while * specified port-argument indicates peer port from enum ntb_default_port, * the return value shall be zero. * * NOTE Don't call this method directly. The ntb_peer_port_idx() function * should be used instead. * * Return: the peer port index or negative value indicating an error */ int ntb_default_peer_port_idx(struct ntb_dev *ntb, int port); /** * ntb_port_number() - get the local port number * @ntb: NTB device context. * * Hardware must support at least simple two-ports ntb connection * * Return: the local port number */ static inline int ntb_port_number(struct ntb_dev *ntb) { if (!ntb->ops->port_number) return ntb_default_port_number(ntb); return ntb->ops->port_number(ntb); } /** * ntb_peer_port_count() - get the number of peer device ports * @ntb: NTB device context. * * Hardware may support an access to memory of several remote domains * over multi-port NTB devices. This method returns the number of peers, * local device can have shared memory with. * * Return: the number of peer ports */ static inline int ntb_peer_port_count(struct ntb_dev *ntb) { if (!ntb->ops->peer_port_count) return ntb_default_peer_port_count(ntb); return ntb->ops->peer_port_count(ntb); } /** * ntb_peer_port_number() - get the peer port by given index * @ntb: NTB device context. * @pidx: Peer port index. * * Peer ports are continuously enumerated by NTB API logic, so this method * lets to retrieve port real number by its index. * * Return: the peer device port or negative value indicating an error */ static inline int ntb_peer_port_number(struct ntb_dev *ntb, int pidx) { if (!ntb->ops->peer_port_number) return ntb_default_peer_port_number(ntb, pidx); return ntb->ops->peer_port_number(ntb, pidx); } /** * ntb_logical_port_number() - get the logical port number of the local port * @ntb: NTB device context. * * The Logical Port Number is defined to be a unique number for each * port starting from zero through to the number of ports minus one. * This is in contrast to the Port Number where each port can be assigned * any unique physical number by the hardware. * * The logical port number is useful for calculating the resource indexes * used by peers. * * Return: the logical port number or negative value indicating an error */ static inline int ntb_logical_port_number(struct ntb_dev *ntb) { int lport = ntb_port_number(ntb); int pidx; if (lport < 0) return lport; for (pidx = 0; pidx < ntb_peer_port_count(ntb); pidx++) if (lport <= ntb_peer_port_number(ntb, pidx)) return pidx; return pidx; } /** * ntb_peer_logical_port_number() - get the logical peer port by given index * @ntb: NTB device context. * @pidx: Peer port index. * * The Logical Port Number is defined to be a unique number for each * port starting from zero through to the number of ports minus one. * This is in contrast to the Port Number where each port can be assigned * any unique physical number by the hardware. * * The logical port number is useful for calculating the resource indexes * used by peers. * * Return: the peer's logical port number or negative value indicating an error */ static inline int ntb_peer_logical_port_number(struct ntb_dev *ntb, int pidx) { if (ntb_peer_port_number(ntb, pidx) < ntb_port_number(ntb)) return pidx; else return pidx + 1; } /** * ntb_peer_port_idx() - get the peer device port index by given port number * @ntb: NTB device context. * @port: Peer port number. * * Inverse operation of ntb_peer_port_number(), so one can get port index * by specified port number. * * Return: the peer port index or negative value indicating an error */ static inline int ntb_peer_port_idx(struct ntb_dev *ntb, int port) { if (!ntb->ops->peer_port_idx) return ntb_default_peer_port_idx(ntb, port); return ntb->ops->peer_port_idx(ntb, port); } /** * ntb_link_is_up() - get the current ntb link state * @ntb: NTB device context. * @speed: OUT - The link speed expressed as PCIe generation number. * @width: OUT - The link width expressed as the number of PCIe lanes. * * Get the current state of the ntb link. It is recommended to query the link * state once after every link event. It is safe to query the link state in * the context of the link event callback. * * Return: bitfield of indexed ports link state: bit is set/cleared if the * link is up/down respectively. */ static inline u64 ntb_link_is_up(struct ntb_dev *ntb, enum ntb_speed *speed, enum ntb_width *width) { return ntb->ops->link_is_up(ntb, speed, width); } /** * ntb_link_enable() - enable the local port ntb connection * @ntb: NTB device context. * @max_speed: The maximum link speed expressed as PCIe generation number. * @max_width: The maximum link width expressed as the number of PCIe lanes. * * Enable the NTB/PCIe link on the local or remote (for bridge-to-bridge * topology) side of the bridge. If it's supported the ntb device should train * the link to its maximum speed and width, or the requested speed and width, * whichever is smaller. Some hardware doesn't support PCIe link training, so * the last two arguments will be ignored then. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_link_enable(struct ntb_dev *ntb, enum ntb_speed max_speed, enum ntb_width max_width) { return ntb->ops->link_enable(ntb, max_speed, max_width); } /** * ntb_link_disable() - disable the local port ntb connection * @ntb: NTB device context. * * Disable the link on the local or remote (for b2b topology) of the ntb. * The ntb device should disable the link. Returning from this call must * indicate that a barrier has passed, though with no more writes may pass in * either direction across the link, except if this call returns an error * number. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_link_disable(struct ntb_dev *ntb) { return ntb->ops->link_disable(ntb); } /** * ntb_mw_count() - get the number of inbound memory windows, which could * be created for a specified peer device * @ntb: NTB device context. * @pidx: Port index of peer device. * * Hardware and topology may support a different number of memory windows. * Moreover different peer devices can support different number of memory * windows. Simply speaking this method returns the number of possible inbound * memory windows to share with specified peer device. Note: this may return * zero if the link is not up yet. * * Return: the number of memory windows. */ static inline int ntb_mw_count(struct ntb_dev *ntb, int pidx) { return ntb->ops->mw_count(ntb, pidx); } /** * ntb_mw_get_align() - get the restriction parameters of inbound memory window * @ntb: NTB device context. * @pidx: Port index of peer device. * @widx: Memory window index. * @addr_align: OUT - the base alignment for translating the memory window * @size_align: OUT - the size alignment for translating the memory window * @size_max: OUT - the maximum size of the memory window * * Get the alignments of an inbound memory window with specified index. * NULL may be given for any output parameter if the value is not needed. * The alignment and size parameters may be used for allocation of proper * shared memory. Note: this must only be called when the link is up. * * Return: Zero on success, otherwise a negative error number. */ static inline int ntb_mw_get_align(struct ntb_dev *ntb, int pidx, int widx, resource_size_t *addr_align, resource_size_t *size_align, resource_size_t *size_max) { if (!(ntb_link_is_up(ntb, NULL, NULL) & BIT_ULL(pidx))) return -ENOTCONN; return ntb->ops->mw_get_align(ntb, pidx, widx, addr_align, size_align, size_max); } /** * ntb_mw_set_trans() - set the translation of an inbound memory window * @ntb: NTB device context. * @pidx: Port index of peer device. * @widx: Memory window index. * @addr: The dma address of local memory to expose to the peer. * @size: The size of the local memory to expose to the peer. * * Set the translation of a memory window. The peer may access local memory * through the window starting at the address, up to the size. The address * and size must be aligned in compliance with restrictions of * ntb_mw_get_align(). The region size should not exceed the size_max parameter * of that method. * * This method may not be implemented due to the hardware specific memory * windows interface. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx, dma_addr_t addr, resource_size_t size) { if (!ntb->ops->mw_set_trans) return 0; return ntb->ops->mw_set_trans(ntb, pidx, widx, addr, size); } /** * ntb_mw_clear_trans() - clear the translation address of an inbound memory * window * @ntb: NTB device context. * @pidx: Port index of peer device. * @widx: Memory window index. * * Clear the translation of an inbound memory window. The peer may no longer * access local memory through the window. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_mw_clear_trans(struct ntb_dev *ntb, int pidx, int widx) { if (!ntb->ops->mw_clear_trans) return ntb_mw_set_trans(ntb, pidx, widx, 0, 0); return ntb->ops->mw_clear_trans(ntb, pidx, widx); } /** * ntb_peer_mw_count() - get the number of outbound memory windows, which could * be mapped to access a shared memory * @ntb: NTB device context. * * Hardware and topology may support a different number of memory windows. * This method returns the number of outbound memory windows supported by * local device. * * Return: the number of memory windows. */ static inline int ntb_peer_mw_count(struct ntb_dev *ntb) { return ntb->ops->peer_mw_count(ntb); } /** * ntb_peer_mw_get_addr() - get map address of an outbound memory window * @ntb: NTB device context. * @widx: Memory window index (within ntb_peer_mw_count() return value). * @base: OUT - the base address of mapping region. * @size: OUT - the size of mapping region. * * Get base and size of memory region to map. NULL may be given for any output * parameter if the value is not needed. The base and size may be used for * mapping the memory window, to access the peer memory. * * Return: Zero on success, otherwise a negative error number. */ static inline int ntb_peer_mw_get_addr(struct ntb_dev *ntb, int widx, phys_addr_t *base, resource_size_t *size) { return ntb->ops->peer_mw_get_addr(ntb, widx, base, size); } /** * ntb_peer_mw_set_trans() - set a translation address of a memory window * retrieved from a peer device * @ntb: NTB device context. * @pidx: Port index of peer device the translation address received from. * @widx: Memory window index. * @addr: The dma address of the shared memory to access. * @size: The size of the shared memory to access. * * Set the translation of an outbound memory window. The local device may * access shared memory allocated by a peer device sent the address. * * This method may not be implemented due to the hardware specific memory * windows interface, so a translation address can be only set on the side, * where shared memory (inbound memory windows) is allocated. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_peer_mw_set_trans(struct ntb_dev *ntb, int pidx, int widx, u64 addr, resource_size_t size) { if (!ntb->ops->peer_mw_set_trans) return 0; return ntb->ops->peer_mw_set_trans(ntb, pidx, widx, addr, size); } /** * ntb_peer_mw_clear_trans() - clear the translation address of an outbound * memory window * @ntb: NTB device context. * @pidx: Port index of peer device. * @widx: Memory window index. * * Clear the translation of a outbound memory window. The local device may no * longer access a shared memory through the window. * * This method may not be implemented due to the hardware specific memory * windows interface. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_peer_mw_clear_trans(struct ntb_dev *ntb, int pidx, int widx) { if (!ntb->ops->peer_mw_clear_trans) return ntb_peer_mw_set_trans(ntb, pidx, widx, 0, 0); return ntb->ops->peer_mw_clear_trans(ntb, pidx, widx); } /** * ntb_db_is_unsafe() - check if it is safe to use hardware doorbell * @ntb: NTB device context. * * It is possible for some ntb hardware to be affected by errata. Hardware * drivers can advise clients to avoid using doorbells. Clients may ignore * this advice, though caution is recommended. * * Return: Zero if it is safe to use doorbells, or One if it is not safe. */ static inline int ntb_db_is_unsafe(struct ntb_dev *ntb) { if (!ntb->ops->db_is_unsafe) return 0; return ntb->ops->db_is_unsafe(ntb); } /** * ntb_db_valid_mask() - get a mask of doorbell bits supported by the ntb * @ntb: NTB device context. * * Hardware may support different number or arrangement of doorbell bits. * * Return: A mask of doorbell bits supported by the ntb. */ static inline u64 ntb_db_valid_mask(struct ntb_dev *ntb) { return ntb->ops->db_valid_mask(ntb); } /** * ntb_db_vector_count() - get the number of doorbell interrupt vectors * @ntb: NTB device context. * * Hardware may support different number of interrupt vectors. * * Return: The number of doorbell interrupt vectors. */ static inline int ntb_db_vector_count(struct ntb_dev *ntb) { if (!ntb->ops->db_vector_count) return 1; return ntb->ops->db_vector_count(ntb); } /** * ntb_db_vector_mask() - get a mask of doorbell bits serviced by a vector * @ntb: NTB device context. * @vector: Doorbell vector number. * * Each interrupt vector may have a different number or arrangement of bits. * * Return: A mask of doorbell bits serviced by a vector. */ static inline u64 ntb_db_vector_mask(struct ntb_dev *ntb, int vector) { if (!ntb->ops->db_vector_mask) return ntb_db_valid_mask(ntb); return ntb->ops->db_vector_mask(ntb, vector); } /** * ntb_db_read() - read the local doorbell register * @ntb: NTB device context. * * Read the local doorbell register, and return the bits that are set. * * Return: The bits currently set in the local doorbell register. */ static inline u64 ntb_db_read(struct ntb_dev *ntb) { return ntb->ops->db_read(ntb); } /** * ntb_db_set() - set bits in the local doorbell register * @ntb: NTB device context. * @db_bits: Doorbell bits to set. * * Set bits in the local doorbell register, which may generate a local doorbell * interrupt. Bits that were already set must remain set. * * This is unusual, and hardware may not support it. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_db_set(struct ntb_dev *ntb, u64 db_bits) { if (!ntb->ops->db_set) return -EINVAL; return ntb->ops->db_set(ntb, db_bits); } /** * ntb_db_clear() - clear bits in the local doorbell register * @ntb: NTB device context. * @db_bits: Doorbell bits to clear. * * Clear bits in the local doorbell register, arming the bits for the next * doorbell. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_db_clear(struct ntb_dev *ntb, u64 db_bits) { return ntb->ops->db_clear(ntb, db_bits); } /** * ntb_db_read_mask() - read the local doorbell mask * @ntb: NTB device context. * * Read the local doorbell mask register, and return the bits that are set. * * This is unusual, though hardware is likely to support it. * * Return: The bits currently set in the local doorbell mask register. */ static inline u64 ntb_db_read_mask(struct ntb_dev *ntb) { if (!ntb->ops->db_read_mask) return 0; return ntb->ops->db_read_mask(ntb); } /** * ntb_db_set_mask() - set bits in the local doorbell mask * @ntb: NTB device context. * @db_bits: Doorbell mask bits to set. * * Set bits in the local doorbell mask register, preventing doorbell interrupts * from being generated for those doorbell bits. Bits that were already set * must remain set. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_db_set_mask(struct ntb_dev *ntb, u64 db_bits) { return ntb->ops->db_set_mask(ntb, db_bits); } /** * ntb_db_clear_mask() - clear bits in the local doorbell mask * @ntb: NTB device context. * @db_bits: Doorbell bits to clear. * * Clear bits in the local doorbell mask register, allowing doorbell interrupts * from being generated for those doorbell bits. If a doorbell bit is already * set at the time the mask is cleared, and the corresponding mask bit is * changed from set to clear, then the ntb driver must ensure that * ntb_db_event() is called. If the hardware does not generate the interrupt * on clearing the mask bit, then the driver must call ntb_db_event() anyway. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_db_clear_mask(struct ntb_dev *ntb, u64 db_bits) { return ntb->ops->db_clear_mask(ntb, db_bits); } /** * ntb_peer_db_addr() - address and size of the peer doorbell register * @ntb: NTB device context. * @db_addr: OUT - The address of the peer doorbell register. * @db_size: OUT - The number of bytes to write the peer doorbell register. * @db_data: OUT - The data of peer doorbell register * @db_bit: door bell bit number * * Return the address of the peer doorbell register. This may be used, for * example, by drivers that offload memory copy operations to a dma engine. * The drivers may wish to ring the peer doorbell at the completion of memory * copy operations. For efficiency, and to simplify ordering of operations * between the dma memory copies and the ringing doorbell, the driver may * append one additional dma memory copy with the doorbell register as the * destination, after the memory copy operations. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_peer_db_addr(struct ntb_dev *ntb, phys_addr_t *db_addr, resource_size_t *db_size, u64 *db_data, int db_bit) { if (!ntb->ops->peer_db_addr) return -EINVAL; return ntb->ops->peer_db_addr(ntb, db_addr, db_size, db_data, db_bit); } /** * ntb_peer_db_read() - read the peer doorbell register * @ntb: NTB device context. * * Read the peer doorbell register, and return the bits that are set. * * This is unusual, and hardware may not support it. * * Return: The bits currently set in the peer doorbell register. */ static inline u64 ntb_peer_db_read(struct ntb_dev *ntb) { if (!ntb->ops->peer_db_read) return 0; return ntb->ops->peer_db_read(ntb); } /** * ntb_peer_db_set() - set bits in the peer doorbell register * @ntb: NTB device context. * @db_bits: Doorbell bits to set. * * Set bits in the peer doorbell register, which may generate a peer doorbell * interrupt. Bits that were already set must remain set. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_peer_db_set(struct ntb_dev *ntb, u64 db_bits) { return ntb->ops->peer_db_set(ntb, db_bits); } /** * ntb_peer_db_clear() - clear bits in the peer doorbell register * @ntb: NTB device context. * @db_bits: Doorbell bits to clear. * * Clear bits in the peer doorbell register, arming the bits for the next * doorbell. * * This is unusual, and hardware may not support it. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_peer_db_clear(struct ntb_dev *ntb, u64 db_bits) { if (!ntb->ops->db_clear) return -EINVAL; return ntb->ops->peer_db_clear(ntb, db_bits); } /** * ntb_peer_db_read_mask() - read the peer doorbell mask * @ntb: NTB device context. * * Read the peer doorbell mask register, and return the bits that are set. * * This is unusual, and hardware may not support it. * * Return: The bits currently set in the peer doorbell mask register. */ static inline u64 ntb_peer_db_read_mask(struct ntb_dev *ntb) { if (!ntb->ops->db_read_mask) return 0; return ntb->ops->peer_db_read_mask(ntb); } /** * ntb_peer_db_set_mask() - set bits in the peer doorbell mask * @ntb: NTB device context. * @db_bits: Doorbell mask bits to set. * * Set bits in the peer doorbell mask register, preventing doorbell interrupts * from being generated for those doorbell bits. Bits that were already set * must remain set. * * This is unusual, and hardware may not support it. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_peer_db_set_mask(struct ntb_dev *ntb, u64 db_bits) { if (!ntb->ops->db_set_mask) return -EINVAL; return ntb->ops->peer_db_set_mask(ntb, db_bits); } /** * ntb_peer_db_clear_mask() - clear bits in the peer doorbell mask * @ntb: NTB device context. * @db_bits: Doorbell bits to clear. * * Clear bits in the peer doorbell mask register, allowing doorbell interrupts * from being generated for those doorbell bits. If the hardware does not * generate the interrupt on clearing the mask bit, then the driver should not * implement this function! * * This is unusual, and hardware may not support it. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_peer_db_clear_mask(struct ntb_dev *ntb, u64 db_bits) { if (!ntb->ops->db_clear_mask) return -EINVAL; return ntb->ops->peer_db_clear_mask(ntb, db_bits); } /** * ntb_spad_is_unsafe() - check if it is safe to use the hardware scratchpads * @ntb: NTB device context. * * It is possible for some ntb hardware to be affected by errata. Hardware * drivers can advise clients to avoid using scratchpads. Clients may ignore * this advice, though caution is recommended. * * Return: Zero if it is safe to use scratchpads, or One if it is not safe. */ static inline int ntb_spad_is_unsafe(struct ntb_dev *ntb) { if (!ntb->ops->spad_is_unsafe) return 0; return ntb->ops->spad_is_unsafe(ntb); } /** * ntb_spad_count() - get the number of scratchpads * @ntb: NTB device context. * * Hardware and topology may support a different number of scratchpads. * Although it must be the same for all ports per NTB device. * * Return: the number of scratchpads. */ static inline int ntb_spad_count(struct ntb_dev *ntb) { if (!ntb->ops->spad_count) return 0; return ntb->ops->spad_count(ntb); } /** * ntb_spad_read() - read the local scratchpad register * @ntb: NTB device context. * @sidx: Scratchpad index. * * Read the local scratchpad register, and return the value. * * Return: The value of the local scratchpad register. */ static inline u32 ntb_spad_read(struct ntb_dev *ntb, int sidx) { if (!ntb->ops->spad_read) return ~(u32)0; return ntb->ops->spad_read(ntb, sidx); } /** * ntb_spad_write() - write the local scratchpad register * @ntb: NTB device context. * @sidx: Scratchpad index. * @val: Scratchpad value. * * Write the value to the local scratchpad register. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_spad_write(struct ntb_dev *ntb, int sidx, u32 val) { if (!ntb->ops->spad_write) return -EINVAL; return ntb->ops->spad_write(ntb, sidx, val); } /** * ntb_peer_spad_addr() - address of the peer scratchpad register * @ntb: NTB device context. * @pidx: Port index of peer device. * @sidx: Scratchpad index. * @spad_addr: OUT - The address of the peer scratchpad register. * * Return the address of the peer scratchpad register. This may be used, for * example, by drivers that offload memory copy operations to a dma engine. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_peer_spad_addr(struct ntb_dev *ntb, int pidx, int sidx, phys_addr_t *spad_addr) { if (!ntb->ops->peer_spad_addr) return -EINVAL; return ntb->ops->peer_spad_addr(ntb, pidx, sidx, spad_addr); } /** * ntb_peer_spad_read() - read the peer scratchpad register * @ntb: NTB device context. * @pidx: Port index of peer device. * @sidx: Scratchpad index. * * Read the peer scratchpad register, and return the value. * * Return: The value of the peer scratchpad register. */ static inline u32 ntb_peer_spad_read(struct ntb_dev *ntb, int pidx, int sidx) { if (!ntb->ops->peer_spad_read) return ~(u32)0; return ntb->ops->peer_spad_read(ntb, pidx, sidx); } /** * ntb_peer_spad_write() - write the peer scratchpad register * @ntb: NTB device context. * @pidx: Port index of peer device. * @sidx: Scratchpad index. * @val: Scratchpad value. * * Write the value to the peer scratchpad register. * * Return: Zero on success, otherwise an error number. */ static inline int ntb_peer_spad_write(struct ntb_dev *ntb, int pidx, int sidx, u32 val) { if (!ntb->ops->peer_spad_write) return -EINVAL; return ntb->ops->peer_spad_write(ntb, pidx, sidx, val); } /** * ntb_msg_count() - get the number of message registers * @ntb: NTB device context. * * Hardware may support a different number of message registers. * * Return: the number of message registers. */ static inline int ntb_msg_count(struct ntb_dev *ntb) { if (!ntb->ops->msg_count) return 0; return ntb->ops->msg_count(ntb); } /** * ntb_msg_inbits() - get a bitfield of inbound message registers status * @ntb: NTB device context. * * The method returns the bitfield of status and mask registers, which related * to inbound message registers. * * Return: bitfield of inbound message registers. */ static inline u64 ntb_msg_inbits(struct ntb_dev *ntb) { if (!ntb->ops->msg_inbits) return 0; return ntb->ops->msg_inbits(ntb); } /** * ntb_msg_outbits() - get a bitfield of outbound message registers status * @ntb: NTB device context. * * The method returns the bitfield of status and mask registers, which related * to outbound message registers. * * Return: bitfield of outbound message registers. */ static inline u64 ntb_msg_outbits(struct ntb_dev *ntb) { if (!ntb->ops->msg_outbits) return 0; return ntb->ops->msg_outbits(ntb); } /** * ntb_msg_read_sts() - read the message registers status * @ntb: NTB device context. * * Read the status of message register. Inbound and outbound message registers * related bits can be filtered by masks retrieved from ntb_msg_inbits() and * ntb_msg_outbits(). * * Return: status bits of message registers */ static inline u64 ntb_msg_read_sts(struct ntb_dev *ntb) { if (!ntb->ops->msg_read_sts) return 0; return ntb->ops->msg_read_sts(ntb); } /** * ntb_msg_clear_sts() - clear status bits of message registers * @ntb: NTB device context. * @sts_bits: Status bits to clear. * * Clear bits in the status register. * * Return: Zero on success, otherwise a negative error number. */ static inline int ntb_msg_clear_sts(struct ntb_dev *ntb, u64 sts_bits) { if (!ntb->ops->msg_clear_sts) return -EINVAL; return ntb->ops->msg_clear_sts(ntb, sts_bits); } /** * ntb_msg_set_mask() - set mask of message register status bits * @ntb: NTB device context. * @mask_bits: Mask bits. * * Mask the message registers status bits from raising the message event. * * Return: Zero on success, otherwise a negative error number. */ static inline int ntb_msg_set_mask(struct ntb_dev *ntb, u64 mask_bits) { if (!ntb->ops->msg_set_mask) return -EINVAL; return ntb->ops->msg_set_mask(ntb, mask_bits); } /** * ntb_msg_clear_mask() - clear message registers mask * @ntb: NTB device context. * @mask_bits: Mask bits to clear. * * Clear bits in the message events mask register. * * Return: Zero on success, otherwise a negative error number. */ static inline int ntb_msg_clear_mask(struct ntb_dev *ntb, u64 mask_bits) { if (!ntb->ops->msg_clear_mask) return -EINVAL; return ntb->ops->msg_clear_mask(ntb, mask_bits); } /** * ntb_msg_read() - read inbound message register with specified index * @ntb: NTB device context. * @pidx: OUT - Port index of peer device a message retrieved from * @midx: Message register index * * Read data from the specified message register. Source port index of a * message is retrieved as well. * * Return: The value of the inbound message register. */ static inline u32 ntb_msg_read(struct ntb_dev *ntb, int *pidx, int midx) { if (!ntb->ops->msg_read) return ~(u32)0; return ntb->ops->msg_read(ntb, pidx, midx); } /** * ntb_peer_msg_write() - write data to the specified peer message register * @ntb: NTB device context. * @pidx: Port index of peer device a message being sent to * @midx: Message register index * @msg: Data to send * * Send data to a specified peer device using the defined message register. * Message event can be raised if the midx registers isn't empty while * calling this method and the corresponding interrupt isn't masked. * * Return: Zero on success, otherwise a negative error number. */ static inline int ntb_peer_msg_write(struct ntb_dev *ntb, int pidx, int midx, u32 msg) { if (!ntb->ops->peer_msg_write) return -EINVAL; return ntb->ops->peer_msg_write(ntb, pidx, midx, msg); } /** * ntb_peer_resource_idx() - get a resource index for a given peer idx * @ntb: NTB device context. * @pidx: Peer port index. * * When constructing a graph of peers, each remote peer must use a different * resource index (mw, doorbell, etc) to communicate with each other * peer. * * In a two peer system, this function should always return 0 such that * resource 0 points to the remote peer on both ports. * * In a 5 peer system, this function will return the following matrix * * pidx \ port 0 1 2 3 4 * 0 0 0 1 2 3 * 1 0 1 1 2 3 * 2 0 1 2 2 3 * 3 0 1 2 3 3 * * For example, if this function is used to program peer's memory * windows, port 0 will program MW 0 on all it's peers to point to itself. * port 1 will program MW 0 in port 0 to point to itself and MW 1 on all * other ports. etc. * * For the legacy two host case, ntb_port_number() and ntb_peer_port_number() * both return zero and therefore this function will always return zero. * So MW 0 on each host would be programmed to point to the other host. * * Return: the resource index to use for that peer. */ static inline int ntb_peer_resource_idx(struct ntb_dev *ntb, int pidx) { int local_port, peer_port; if (pidx >= ntb_peer_port_count(ntb)) return -EINVAL; local_port = ntb_logical_port_number(ntb); peer_port = ntb_peer_logical_port_number(ntb, pidx); if (peer_port < local_port) return local_port - 1; else return local_port; } /** * ntb_peer_highest_mw_idx() - get a memory window index for a given peer idx * using the highest index memory windows first * * @ntb: NTB device context. * @pidx: Peer port index. * * Like ntb_peer_resource_idx(), except it returns indexes starting with * last memory window index. * * Return: the resource index to use for that peer. */ static inline int ntb_peer_highest_mw_idx(struct ntb_dev *ntb, int pidx) { int ret; ret = ntb_peer_resource_idx(ntb, pidx); if (ret < 0) return ret; return ntb_mw_count(ntb, pidx) - ret - 1; } struct ntb_msi_desc { u32 addr_offset; u32 data; }; #ifdef CONFIG_NTB_MSI int ntb_msi_init(struct ntb_dev *ntb, void (*desc_changed)(void *ctx)); int ntb_msi_setup_mws(struct ntb_dev *ntb); void ntb_msi_clear_mws(struct ntb_dev *ntb); int ntbm_msi_request_threaded_irq(struct ntb_dev *ntb, irq_handler_t handler, irq_handler_t thread_fn, const char *name, void *dev_id, struct ntb_msi_desc *msi_desc); void ntbm_msi_free_irq(struct ntb_dev *ntb, unsigned int irq, void *dev_id); int ntb_msi_peer_trigger(struct ntb_dev *ntb, int peer, struct ntb_msi_desc *desc); int ntb_msi_peer_addr(struct ntb_dev *ntb, int peer, struct ntb_msi_desc *desc, phys_addr_t *msi_addr); #else /* not CONFIG_NTB_MSI */ static inline int ntb_msi_init(struct ntb_dev *ntb, void (*desc_changed)(void *ctx)) { return -EOPNOTSUPP; } static inline int ntb_msi_setup_mws(struct ntb_dev *ntb) { return -EOPNOTSUPP; } static inline void ntb_msi_clear_mws(struct ntb_dev *ntb) {} static inline int ntbm_msi_request_threaded_irq(struct ntb_dev *ntb, irq_handler_t handler, irq_handler_t thread_fn, const char *name, void *dev_id, struct ntb_msi_desc *msi_desc) { return -EOPNOTSUPP; } static inline void ntbm_msi_free_irq(struct ntb_dev *ntb, unsigned int irq, void *dev_id) {} static inline int ntb_msi_peer_trigger(struct ntb_dev *ntb, int peer, struct ntb_msi_desc *desc) { return -EOPNOTSUPP; } static inline int ntb_msi_peer_addr(struct ntb_dev *ntb, int peer, struct ntb_msi_desc *desc, phys_addr_t *msi_addr) { return -EOPNOTSUPP; } #endif /* CONFIG_NTB_MSI */ static inline int ntbm_msi_request_irq(struct ntb_dev *ntb, irq_handler_t handler, const char *name, void *dev_id, struct ntb_msi_desc *msi_desc) { return ntbm_msi_request_threaded_irq(ntb, handler, NULL, name, dev_id, msi_desc); } #endif
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