diff options
Diffstat (limited to 'drivers/ntb/test')
| -rw-r--r-- | drivers/ntb/test/Kconfig | 37 | ||||
| -rw-r--r-- | drivers/ntb/test/Makefile | 5 | ||||
| -rw-r--r-- | drivers/ntb/test/ntb_msi_test.c | 432 | ||||
| -rw-r--r-- | drivers/ntb/test/ntb_perf.c | 1567 | ||||
| -rw-r--r-- | drivers/ntb/test/ntb_pingpong.c | 433 | ||||
| -rw-r--r-- | drivers/ntb/test/ntb_tool.c | 1696 |
6 files changed, 4170 insertions, 0 deletions
diff --git a/drivers/ntb/test/Kconfig b/drivers/ntb/test/Kconfig new file mode 100644 index 000000000..516b991f3 --- /dev/null +++ b/drivers/ntb/test/Kconfig @@ -0,0 +1,37 @@ +# SPDX-License-Identifier: GPL-2.0-only +config NTB_PINGPONG + tristate "NTB Ping Pong Test Client" + help + This is a simple ping pong driver that exercises the scratchpads and + doorbells of the ntb hardware. This driver may be used to test that + your ntb hardware and drivers are functioning at a basic level. + + If unsure, say N. + +config NTB_TOOL + tristate "NTB Debugging Tool Test Client" + help + This is a simple debugging driver that enables the doorbell and + scratchpad registers to be read and written from the debugfs. This + enables more complicated debugging to be scripted from user space. + This driver may be used to test that your ntb hardware and drivers are + functioning at a basic level. + + If unsure, say N. + +config NTB_PERF + tristate "NTB RAW Perf Measuring Tool" + help + This is a tool to measure raw NTB performance by transferring data + to and from the window without additional software interaction. + + If unsure, say N. + +config NTB_MSI_TEST + tristate "NTB MSI Test Client" + depends on NTB_MSI + help + This tool demonstrates the use of the NTB MSI library to + send MSI interrupts between peers. + + If unsure, say N. diff --git a/drivers/ntb/test/Makefile b/drivers/ntb/test/Makefile new file mode 100644 index 000000000..19ed91d8a --- /dev/null +++ b/drivers/ntb/test/Makefile @@ -0,0 +1,5 @@ +# SPDX-License-Identifier: GPL-2.0-only +obj-$(CONFIG_NTB_PINGPONG) += ntb_pingpong.o +obj-$(CONFIG_NTB_TOOL) += ntb_tool.o +obj-$(CONFIG_NTB_PERF) += ntb_perf.o +obj-$(CONFIG_NTB_MSI_TEST) += ntb_msi_test.o diff --git a/drivers/ntb/test/ntb_msi_test.c b/drivers/ntb/test/ntb_msi_test.c new file mode 100644 index 000000000..4e18e0877 --- /dev/null +++ b/drivers/ntb/test/ntb_msi_test.c @@ -0,0 +1,432 @@ +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) + +#include <linux/module.h> +#include <linux/debugfs.h> +#include <linux/ntb.h> +#include <linux/pci.h> +#include <linux/radix-tree.h> +#include <linux/workqueue.h> + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION("0.1"); +MODULE_AUTHOR("Logan Gunthorpe <logang@deltatee.com>"); +MODULE_DESCRIPTION("Test for sending MSI interrupts over an NTB memory window"); + +static int num_irqs = 4; +module_param(num_irqs, int, 0644); +MODULE_PARM_DESC(num_irqs, "number of irqs to use"); + +struct ntb_msit_ctx { + struct ntb_dev *ntb; + struct dentry *dbgfs_dir; + struct work_struct setup_work; + + struct ntb_msit_isr_ctx { + int irq_idx; + int irq_num; + int occurrences; + struct ntb_msit_ctx *nm; + struct ntb_msi_desc desc; + } *isr_ctx; + + struct ntb_msit_peer { + struct ntb_msit_ctx *nm; + int pidx; + int num_irqs; + struct completion init_comp; + struct ntb_msi_desc *msi_desc; + } peers[]; +}; + +static struct dentry *ntb_msit_dbgfs_topdir; + +static irqreturn_t ntb_msit_isr(int irq, void *dev) +{ + struct ntb_msit_isr_ctx *isr_ctx = dev; + struct ntb_msit_ctx *nm = isr_ctx->nm; + + dev_dbg(&nm->ntb->dev, "Interrupt Occurred: %d", + isr_ctx->irq_idx); + + isr_ctx->occurrences++; + + return IRQ_HANDLED; +} + +static void ntb_msit_setup_work(struct work_struct *work) +{ + struct ntb_msit_ctx *nm = container_of(work, struct ntb_msit_ctx, + setup_work); + int irq_count = 0; + int irq; + int ret; + uintptr_t i; + + ret = ntb_msi_setup_mws(nm->ntb); + if (ret) { + dev_err(&nm->ntb->dev, "Unable to setup MSI windows: %d\n", + ret); + return; + } + + for (i = 0; i < num_irqs; i++) { + nm->isr_ctx[i].irq_idx = i; + nm->isr_ctx[i].nm = nm; + + if (!nm->isr_ctx[i].irq_num) { + irq = ntbm_msi_request_irq(nm->ntb, ntb_msit_isr, + KBUILD_MODNAME, + &nm->isr_ctx[i], + &nm->isr_ctx[i].desc); + if (irq < 0) + break; + + nm->isr_ctx[i].irq_num = irq; + } + + ret = ntb_spad_write(nm->ntb, 2 * i + 1, + nm->isr_ctx[i].desc.addr_offset); + if (ret) + break; + + ret = ntb_spad_write(nm->ntb, 2 * i + 2, + nm->isr_ctx[i].desc.data); + if (ret) + break; + + irq_count++; + } + + ntb_spad_write(nm->ntb, 0, irq_count); + ntb_peer_db_set(nm->ntb, BIT(ntb_port_number(nm->ntb))); +} + +static void ntb_msit_desc_changed(void *ctx) +{ + struct ntb_msit_ctx *nm = ctx; + int i; + + dev_dbg(&nm->ntb->dev, "MSI Descriptors Changed\n"); + + for (i = 0; i < num_irqs; i++) { + ntb_spad_write(nm->ntb, 2 * i + 1, + nm->isr_ctx[i].desc.addr_offset); + ntb_spad_write(nm->ntb, 2 * i + 2, + nm->isr_ctx[i].desc.data); + } + + ntb_peer_db_set(nm->ntb, BIT(ntb_port_number(nm->ntb))); +} + +static void ntb_msit_link_event(void *ctx) +{ + struct ntb_msit_ctx *nm = ctx; + + if (!ntb_link_is_up(nm->ntb, NULL, NULL)) + return; + + schedule_work(&nm->setup_work); +} + +static void ntb_msit_copy_peer_desc(struct ntb_msit_ctx *nm, int peer) +{ + int i; + struct ntb_msi_desc *desc = nm->peers[peer].msi_desc; + int irq_count = nm->peers[peer].num_irqs; + + for (i = 0; i < irq_count; i++) { + desc[i].addr_offset = ntb_peer_spad_read(nm->ntb, peer, + 2 * i + 1); + desc[i].data = ntb_peer_spad_read(nm->ntb, peer, 2 * i + 2); + } + + dev_info(&nm->ntb->dev, "Found %d interrupts on peer %d\n", + irq_count, peer); + + complete_all(&nm->peers[peer].init_comp); +} + +static void ntb_msit_db_event(void *ctx, int vec) +{ + struct ntb_msit_ctx *nm = ctx; + struct ntb_msi_desc *desc; + u64 peer_mask = ntb_db_read(nm->ntb); + u32 irq_count; + int peer; + + ntb_db_clear(nm->ntb, peer_mask); + + for (peer = 0; peer < sizeof(peer_mask) * 8; peer++) { + if (!(peer_mask & BIT(peer))) + continue; + + irq_count = ntb_peer_spad_read(nm->ntb, peer, 0); + if (irq_count == -1) + continue; + + desc = kcalloc(irq_count, sizeof(*desc), GFP_ATOMIC); + if (!desc) + continue; + + kfree(nm->peers[peer].msi_desc); + nm->peers[peer].msi_desc = desc; + nm->peers[peer].num_irqs = irq_count; + + ntb_msit_copy_peer_desc(nm, peer); + } +} + +static const struct ntb_ctx_ops ntb_msit_ops = { + .link_event = ntb_msit_link_event, + .db_event = ntb_msit_db_event, +}; + +static int ntb_msit_dbgfs_trigger(void *data, u64 idx) +{ + struct ntb_msit_peer *peer = data; + + if (idx >= peer->num_irqs) + return -EINVAL; + + dev_dbg(&peer->nm->ntb->dev, "trigger irq %llu on peer %u\n", + idx, peer->pidx); + + return ntb_msi_peer_trigger(peer->nm->ntb, peer->pidx, + &peer->msi_desc[idx]); +} + +DEFINE_DEBUGFS_ATTRIBUTE(ntb_msit_trigger_fops, NULL, + ntb_msit_dbgfs_trigger, "%llu\n"); + +static int ntb_msit_dbgfs_port_get(void *data, u64 *port) +{ + struct ntb_msit_peer *peer = data; + + *port = ntb_peer_port_number(peer->nm->ntb, peer->pidx); + + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(ntb_msit_port_fops, ntb_msit_dbgfs_port_get, + NULL, "%llu\n"); + +static int ntb_msit_dbgfs_count_get(void *data, u64 *count) +{ + struct ntb_msit_peer *peer = data; + + *count = peer->num_irqs; + + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(ntb_msit_count_fops, ntb_msit_dbgfs_count_get, + NULL, "%llu\n"); + +static int ntb_msit_dbgfs_ready_get(void *data, u64 *ready) +{ + struct ntb_msit_peer *peer = data; + + *ready = try_wait_for_completion(&peer->init_comp); + + return 0; +} + +static int ntb_msit_dbgfs_ready_set(void *data, u64 ready) +{ + struct ntb_msit_peer *peer = data; + + return wait_for_completion_interruptible(&peer->init_comp); +} + +DEFINE_DEBUGFS_ATTRIBUTE(ntb_msit_ready_fops, ntb_msit_dbgfs_ready_get, + ntb_msit_dbgfs_ready_set, "%llu\n"); + +static int ntb_msit_dbgfs_occurrences_get(void *data, u64 *occurrences) +{ + struct ntb_msit_isr_ctx *isr_ctx = data; + + *occurrences = isr_ctx->occurrences; + + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(ntb_msit_occurrences_fops, + ntb_msit_dbgfs_occurrences_get, + NULL, "%llu\n"); + +static int ntb_msit_dbgfs_local_port_get(void *data, u64 *port) +{ + struct ntb_msit_ctx *nm = data; + + *port = ntb_port_number(nm->ntb); + + return 0; +} + +DEFINE_DEBUGFS_ATTRIBUTE(ntb_msit_local_port_fops, + ntb_msit_dbgfs_local_port_get, + NULL, "%llu\n"); + +static void ntb_msit_create_dbgfs(struct ntb_msit_ctx *nm) +{ + struct pci_dev *pdev = nm->ntb->pdev; + char buf[32]; + int i; + struct dentry *peer_dir; + + nm->dbgfs_dir = debugfs_create_dir(pci_name(pdev), + ntb_msit_dbgfs_topdir); + debugfs_create_file("port", 0400, nm->dbgfs_dir, nm, + &ntb_msit_local_port_fops); + + for (i = 0; i < ntb_peer_port_count(nm->ntb); i++) { + nm->peers[i].pidx = i; + nm->peers[i].nm = nm; + init_completion(&nm->peers[i].init_comp); + + snprintf(buf, sizeof(buf), "peer%d", i); + peer_dir = debugfs_create_dir(buf, nm->dbgfs_dir); + + debugfs_create_file_unsafe("trigger", 0200, peer_dir, + &nm->peers[i], + &ntb_msit_trigger_fops); + + debugfs_create_file_unsafe("port", 0400, peer_dir, + &nm->peers[i], &ntb_msit_port_fops); + + debugfs_create_file_unsafe("count", 0400, peer_dir, + &nm->peers[i], + &ntb_msit_count_fops); + + debugfs_create_file_unsafe("ready", 0600, peer_dir, + &nm->peers[i], + &ntb_msit_ready_fops); + } + + for (i = 0; i < num_irqs; i++) { + snprintf(buf, sizeof(buf), "irq%d_occurrences", i); + debugfs_create_file_unsafe(buf, 0400, nm->dbgfs_dir, + &nm->isr_ctx[i], + &ntb_msit_occurrences_fops); + } +} + +static void ntb_msit_remove_dbgfs(struct ntb_msit_ctx *nm) +{ + debugfs_remove_recursive(nm->dbgfs_dir); +} + +static int ntb_msit_probe(struct ntb_client *client, struct ntb_dev *ntb) +{ + struct ntb_msit_ctx *nm; + int peers; + int ret; + + peers = ntb_peer_port_count(ntb); + if (peers <= 0) + return -EINVAL; + + if (ntb_spad_is_unsafe(ntb) || ntb_spad_count(ntb) < 2 * num_irqs + 1) { + dev_err(&ntb->dev, "NTB MSI test requires at least %d spads for %d irqs\n", + 2 * num_irqs + 1, num_irqs); + return -EFAULT; + } + + ret = ntb_spad_write(ntb, 0, -1); + if (ret) { + dev_err(&ntb->dev, "Unable to write spads: %d\n", ret); + return ret; + } + + ret = ntb_db_clear_mask(ntb, GENMASK(peers - 1, 0)); + if (ret) { + dev_err(&ntb->dev, "Unable to clear doorbell mask: %d\n", ret); + return ret; + } + + ret = ntb_msi_init(ntb, ntb_msit_desc_changed); + if (ret) { + dev_err(&ntb->dev, "Unable to initialize MSI library: %d\n", + ret); + return ret; + } + + nm = devm_kzalloc(&ntb->dev, struct_size(nm, peers, peers), GFP_KERNEL); + if (!nm) + return -ENOMEM; + + nm->isr_ctx = devm_kcalloc(&ntb->dev, num_irqs, sizeof(*nm->isr_ctx), + GFP_KERNEL); + if (!nm->isr_ctx) + return -ENOMEM; + + INIT_WORK(&nm->setup_work, ntb_msit_setup_work); + nm->ntb = ntb; + + ntb_msit_create_dbgfs(nm); + + ret = ntb_set_ctx(ntb, nm, &ntb_msit_ops); + if (ret) + goto remove_dbgfs; + + if (!nm->isr_ctx) { + ret = -ENOMEM; + goto remove_dbgfs; + } + + ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); + + return 0; + +remove_dbgfs: + ntb_msit_remove_dbgfs(nm); + devm_kfree(&ntb->dev, nm->isr_ctx); + devm_kfree(&ntb->dev, nm); + return ret; +} + +static void ntb_msit_remove(struct ntb_client *client, struct ntb_dev *ntb) +{ + struct ntb_msit_ctx *nm = ntb->ctx; + int i; + + ntb_link_disable(ntb); + ntb_db_set_mask(ntb, ntb_db_valid_mask(ntb)); + ntb_msi_clear_mws(ntb); + + for (i = 0; i < ntb_peer_port_count(ntb); i++) + kfree(nm->peers[i].msi_desc); + + ntb_clear_ctx(ntb); + ntb_msit_remove_dbgfs(nm); +} + +static struct ntb_client ntb_msit_client = { + .ops = { + .probe = ntb_msit_probe, + .remove = ntb_msit_remove + } +}; + +static int __init ntb_msit_init(void) +{ + int ret; + + if (debugfs_initialized()) + ntb_msit_dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, + NULL); + + ret = ntb_register_client(&ntb_msit_client); + if (ret) + debugfs_remove_recursive(ntb_msit_dbgfs_topdir); + + return ret; +} +module_init(ntb_msit_init); + +static void __exit ntb_msit_exit(void) +{ + ntb_unregister_client(&ntb_msit_client); + debugfs_remove_recursive(ntb_msit_dbgfs_topdir); +} +module_exit(ntb_msit_exit); diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c new file mode 100644 index 000000000..65e1e5cf1 --- /dev/null +++ b/drivers/ntb/test/ntb_perf.c @@ -0,0 +1,1567 @@ +/* + * 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 Intel Corporation. All rights reserved. + * Copyright(c) 2017 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. + * + * BSD LICENSE + * + * Copyright(c) 2015 Intel Corporation. All rights reserved. + * Copyright(c) 2017 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 Perf Linux driver + */ + +/* + * How to use this tool, by example. + * + * Assuming $DBG_DIR is something like: + * '/sys/kernel/debug/ntb_perf/0000:00:03.0' + * Suppose aside from local device there is at least one remote device + * connected to NTB with index 0. + *----------------------------------------------------------------------------- + * Eg: install driver with specified chunk/total orders and dma-enabled flag + * + * root@self# insmod ntb_perf.ko chunk_order=19 total_order=28 use_dma + *----------------------------------------------------------------------------- + * Eg: check NTB ports (index) and MW mapping information + * + * root@self# cat $DBG_DIR/info + *----------------------------------------------------------------------------- + * Eg: start performance test with peer (index 0) and get the test metrics + * + * root@self# echo 0 > $DBG_DIR/run + * root@self# cat $DBG_DIR/run + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/sched.h> +#include <linux/wait.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/pci.h> +#include <linux/ktime.h> +#include <linux/slab.h> +#include <linux/delay.h> +#include <linux/sizes.h> +#include <linux/workqueue.h> +#include <linux/debugfs.h> +#include <linux/random.h> +#include <linux/ntb.h> + +#define DRIVER_NAME "ntb_perf" +#define DRIVER_VERSION "2.0" + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION(DRIVER_VERSION); +MODULE_AUTHOR("Dave Jiang <dave.jiang@intel.com>"); +MODULE_DESCRIPTION("PCIe NTB Performance Measurement Tool"); + +#define MAX_THREADS_CNT 32 +#define DEF_THREADS_CNT 1 +#define MAX_CHUNK_SIZE SZ_1M +#define MAX_CHUNK_ORDER 20 /* no larger than 1M */ + +#define DMA_TRIES 100 +#define DMA_MDELAY 10 + +#define MSG_TRIES 1000 +#define MSG_UDELAY_LOW 1000000 +#define MSG_UDELAY_HIGH 2000000 + +#define PERF_BUF_LEN 1024 + +static unsigned long max_mw_size; +module_param(max_mw_size, ulong, 0644); +MODULE_PARM_DESC(max_mw_size, "Upper limit of memory window size"); + +static unsigned char chunk_order = 19; /* 512K */ +module_param(chunk_order, byte, 0644); +MODULE_PARM_DESC(chunk_order, "Data chunk order [2^n] to transfer"); + +static unsigned char total_order = 30; /* 1G */ +module_param(total_order, byte, 0644); +MODULE_PARM_DESC(total_order, "Total data order [2^n] to transfer"); + +static bool use_dma; /* default to 0 */ +module_param(use_dma, bool, 0644); +MODULE_PARM_DESC(use_dma, "Use DMA engine to measure performance"); + +/*============================================================================== + * Perf driver data definition + *============================================================================== + */ + +enum perf_cmd { + PERF_CMD_INVAL = -1,/* invalid spad command */ + PERF_CMD_SSIZE = 0, /* send out buffer size */ + PERF_CMD_RSIZE = 1, /* recv in buffer size */ + PERF_CMD_SXLAT = 2, /* send in buffer xlat */ + PERF_CMD_RXLAT = 3, /* recv out buffer xlat */ + PERF_CMD_CLEAR = 4, /* clear allocated memory */ + PERF_STS_DONE = 5, /* init is done */ + PERF_STS_LNKUP = 6, /* link up state flag */ +}; + +struct perf_ctx; + +struct perf_peer { + struct perf_ctx *perf; + int pidx; + int gidx; + + /* Outbound MW params */ + u64 outbuf_xlat; + resource_size_t outbuf_size; + void __iomem *outbuf; + phys_addr_t out_phys_addr; + dma_addr_t dma_dst_addr; + /* Inbound MW params */ + dma_addr_t inbuf_xlat; + resource_size_t inbuf_size; + void *inbuf; + + /* NTB connection setup service */ + struct work_struct service; + unsigned long sts; + + struct completion init_comp; +}; +#define to_peer_service(__work) \ + container_of(__work, struct perf_peer, service) + +struct perf_thread { + struct perf_ctx *perf; + int tidx; + + /* DMA-based test sync parameters */ + atomic_t dma_sync; + wait_queue_head_t dma_wait; + struct dma_chan *dma_chan; + + /* Data source and measured statistics */ + void *src; + u64 copied; + ktime_t duration; + int status; + struct work_struct work; +}; +#define to_thread_work(__work) \ + container_of(__work, struct perf_thread, work) + +struct perf_ctx { + struct ntb_dev *ntb; + + /* Global device index and peers descriptors */ + int gidx; + int pcnt; + struct perf_peer *peers; + + /* Performance measuring work-threads interface */ + unsigned long busy_flag; + wait_queue_head_t twait; + atomic_t tsync; + u8 tcnt; + struct perf_peer *test_peer; + struct perf_thread threads[MAX_THREADS_CNT]; + + /* Scratchpad/Message IO operations */ + int (*cmd_send)(struct perf_peer *peer, enum perf_cmd cmd, u64 data); + int (*cmd_recv)(struct perf_ctx *perf, int *pidx, enum perf_cmd *cmd, + u64 *data); + + struct dentry *dbgfs_dir; +}; + +/* + * Scratchpads-base commands interface + */ +#define PERF_SPAD_CNT(_pcnt) \ + (3*((_pcnt) + 1)) +#define PERF_SPAD_CMD(_gidx) \ + (3*(_gidx)) +#define PERF_SPAD_LDATA(_gidx) \ + (3*(_gidx) + 1) +#define PERF_SPAD_HDATA(_gidx) \ + (3*(_gidx) + 2) +#define PERF_SPAD_NOTIFY(_gidx) \ + (BIT_ULL(_gidx)) + +/* + * Messages-base commands interface + */ +#define PERF_MSG_CNT 3 +#define PERF_MSG_CMD 0 +#define PERF_MSG_LDATA 1 +#define PERF_MSG_HDATA 2 + +/*============================================================================== + * Static data declarations + *============================================================================== + */ + +static struct dentry *perf_dbgfs_topdir; + +static struct workqueue_struct *perf_wq __read_mostly; + +/*============================================================================== + * NTB cross-link commands execution service + *============================================================================== + */ + +static void perf_terminate_test(struct perf_ctx *perf); + +static inline bool perf_link_is_up(struct perf_peer *peer) +{ + u64 link; + + link = ntb_link_is_up(peer->perf->ntb, NULL, NULL); + return !!(link & BIT_ULL_MASK(peer->pidx)); +} + +static int perf_spad_cmd_send(struct perf_peer *peer, enum perf_cmd cmd, + u64 data) +{ + struct perf_ctx *perf = peer->perf; + int try; + u32 sts; + + dev_dbg(&perf->ntb->dev, "CMD send: %d 0x%llx\n", cmd, data); + + /* + * Perform predefined number of attempts before give up. + * We are sending the data to the port specific scratchpad, so + * to prevent a multi-port access race-condition. Additionally + * there is no need in local locking since only thread-safe + * service work is using this method. + */ + for (try = 0; try < MSG_TRIES; try++) { + if (!perf_link_is_up(peer)) + return -ENOLINK; + + sts = ntb_peer_spad_read(perf->ntb, peer->pidx, + PERF_SPAD_CMD(perf->gidx)); + if (sts != PERF_CMD_INVAL) { + usleep_range(MSG_UDELAY_LOW, MSG_UDELAY_HIGH); + continue; + } + + ntb_peer_spad_write(perf->ntb, peer->pidx, + PERF_SPAD_LDATA(perf->gidx), + lower_32_bits(data)); + ntb_peer_spad_write(perf->ntb, peer->pidx, + PERF_SPAD_HDATA(perf->gidx), + upper_32_bits(data)); + ntb_peer_spad_write(perf->ntb, peer->pidx, + PERF_SPAD_CMD(perf->gidx), + cmd); + ntb_peer_db_set(perf->ntb, PERF_SPAD_NOTIFY(peer->gidx)); + + dev_dbg(&perf->ntb->dev, "DB ring peer %#llx\n", + PERF_SPAD_NOTIFY(peer->gidx)); + + break; + } + + return try < MSG_TRIES ? 0 : -EAGAIN; +} + +static int perf_spad_cmd_recv(struct perf_ctx *perf, int *pidx, + enum perf_cmd *cmd, u64 *data) +{ + struct perf_peer *peer; + u32 val; + + ntb_db_clear(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx)); + + /* + * We start scanning all over, since cleared DB may have been set + * by any peer. Yes, it makes peer with smaller index being + * serviced with greater priority, but it's convenient for spad + * and message code unification and simplicity. + */ + for (*pidx = 0; *pidx < perf->pcnt; (*pidx)++) { + peer = &perf->peers[*pidx]; + + if (!perf_link_is_up(peer)) + continue; + + val = ntb_spad_read(perf->ntb, PERF_SPAD_CMD(peer->gidx)); + if (val == PERF_CMD_INVAL) + continue; + + *cmd = val; + + val = ntb_spad_read(perf->ntb, PERF_SPAD_LDATA(peer->gidx)); + *data = val; + + val = ntb_spad_read(perf->ntb, PERF_SPAD_HDATA(peer->gidx)); + *data |= (u64)val << 32; + + /* Next command can be retrieved from now */ + ntb_spad_write(perf->ntb, PERF_SPAD_CMD(peer->gidx), + PERF_CMD_INVAL); + + dev_dbg(&perf->ntb->dev, "CMD recv: %d 0x%llx\n", *cmd, *data); + + return 0; + } + + return -ENODATA; +} + +static int perf_msg_cmd_send(struct perf_peer *peer, enum perf_cmd cmd, + u64 data) +{ + struct perf_ctx *perf = peer->perf; + int try, ret; + u64 outbits; + + dev_dbg(&perf->ntb->dev, "CMD send: %d 0x%llx\n", cmd, data); + + /* + * Perform predefined number of attempts before give up. Message + * registers are free of race-condition problem when accessed + * from different ports, so we don't need splitting registers + * by global device index. We also won't have local locking, + * since the method is used from service work only. + */ + outbits = ntb_msg_outbits(perf->ntb); + for (try = 0; try < MSG_TRIES; try++) { + if (!perf_link_is_up(peer)) + return -ENOLINK; + + ret = ntb_msg_clear_sts(perf->ntb, outbits); + if (ret) + return ret; + + ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_LDATA, + lower_32_bits(data)); + + if (ntb_msg_read_sts(perf->ntb) & outbits) { + usleep_range(MSG_UDELAY_LOW, MSG_UDELAY_HIGH); + continue; + } + + ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_HDATA, + upper_32_bits(data)); + + /* This call shall trigger peer message event */ + ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_CMD, cmd); + + break; + } + + return try < MSG_TRIES ? 0 : -EAGAIN; +} + +static int perf_msg_cmd_recv(struct perf_ctx *perf, int *pidx, + enum perf_cmd *cmd, u64 *data) +{ + u64 inbits; + u32 val; + + inbits = ntb_msg_inbits(perf->ntb); + + if (hweight64(ntb_msg_read_sts(perf->ntb) & inbits) < 3) + return -ENODATA; + + val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_CMD); + *cmd = val; + + val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_LDATA); + *data = val; + + val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_HDATA); + *data |= (u64)val << 32; + + /* Next command can be retrieved from now */ + ntb_msg_clear_sts(perf->ntb, inbits); + + dev_dbg(&perf->ntb->dev, "CMD recv: %d 0x%llx\n", *cmd, *data); + + return 0; +} + +static int perf_cmd_send(struct perf_peer *peer, enum perf_cmd cmd, u64 data) +{ + struct perf_ctx *perf = peer->perf; + + if (cmd == PERF_CMD_SSIZE || cmd == PERF_CMD_SXLAT) + return perf->cmd_send(peer, cmd, data); + + dev_err(&perf->ntb->dev, "Send invalid command\n"); + return -EINVAL; +} + +static int perf_cmd_exec(struct perf_peer *peer, enum perf_cmd cmd) +{ + switch (cmd) { + case PERF_CMD_SSIZE: + case PERF_CMD_RSIZE: + case PERF_CMD_SXLAT: + case PERF_CMD_RXLAT: + case PERF_CMD_CLEAR: + break; + default: + dev_err(&peer->perf->ntb->dev, "Exec invalid command\n"); + return -EINVAL; + } + + /* No need of memory barrier, since bit ops have invernal lock */ + set_bit(cmd, &peer->sts); + + dev_dbg(&peer->perf->ntb->dev, "CMD exec: %d\n", cmd); + + (void)queue_work(system_highpri_wq, &peer->service); + + return 0; +} + +static int perf_cmd_recv(struct perf_ctx *perf) +{ + struct perf_peer *peer; + int ret, pidx, cmd; + u64 data; + + while (!(ret = perf->cmd_recv(perf, &pidx, &cmd, &data))) { + peer = &perf->peers[pidx]; + + switch (cmd) { + case PERF_CMD_SSIZE: + peer->inbuf_size = data; + return perf_cmd_exec(peer, PERF_CMD_RSIZE); + case PERF_CMD_SXLAT: + peer->outbuf_xlat = data; + return perf_cmd_exec(peer, PERF_CMD_RXLAT); + default: + dev_err(&perf->ntb->dev, "Recv invalid command\n"); + return -EINVAL; + } + } + + /* Return 0 if no data left to process, otherwise an error */ + return ret == -ENODATA ? 0 : ret; +} + +static void perf_link_event(void *ctx) +{ + struct perf_ctx *perf = ctx; + struct perf_peer *peer; + bool lnk_up; + int pidx; + + for (pidx = 0; pidx < perf->pcnt; pidx++) { + peer = &perf->peers[pidx]; + + lnk_up = perf_link_is_up(peer); + + if (lnk_up && + !test_and_set_bit(PERF_STS_LNKUP, &peer->sts)) { + perf_cmd_exec(peer, PERF_CMD_SSIZE); + } else if (!lnk_up && + test_and_clear_bit(PERF_STS_LNKUP, &peer->sts)) { + perf_cmd_exec(peer, PERF_CMD_CLEAR); + } + } +} + +static void perf_db_event(void *ctx, int vec) +{ + struct perf_ctx *perf = ctx; + + dev_dbg(&perf->ntb->dev, "DB vec %d mask %#llx bits %#llx\n", vec, + ntb_db_vector_mask(perf->ntb, vec), ntb_db_read(perf->ntb)); + + /* Just receive all available commands */ + (void)perf_cmd_recv(perf); +} + +static void perf_msg_event(void *ctx) +{ + struct perf_ctx *perf = ctx; + + dev_dbg(&perf->ntb->dev, "Msg status bits %#llx\n", + ntb_msg_read_sts(perf->ntb)); + + /* Messages are only sent one-by-one */ + (void)perf_cmd_recv(perf); +} + +static const struct ntb_ctx_ops perf_ops = { + .link_event = perf_link_event, + .db_event = perf_db_event, + .msg_event = perf_msg_event +}; + +static void perf_free_outbuf(struct perf_peer *peer) +{ + (void)ntb_peer_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx); +} + +static int perf_setup_outbuf(struct perf_peer *peer) +{ + struct perf_ctx *perf = peer->perf; + int ret; + + /* Outbuf size can be unaligned due to custom max_mw_size */ + ret = ntb_peer_mw_set_trans(perf->ntb, peer->pidx, peer->gidx, + peer->outbuf_xlat, peer->outbuf_size); + if (ret) { + dev_err(&perf->ntb->dev, "Failed to set outbuf translation\n"); + return ret; + } + + /* Initialization is finally done */ + set_bit(PERF_STS_DONE, &peer->sts); + complete_all(&peer->init_comp); + + return 0; +} + +static void perf_free_inbuf(struct perf_peer *peer) +{ + if (!peer->inbuf) + return; + + (void)ntb_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx); + dma_free_coherent(&peer->perf->ntb->pdev->dev, peer->inbuf_size, + peer->inbuf, peer->inbuf_xlat); + peer->inbuf = NULL; +} + +static int perf_setup_inbuf(struct perf_peer *peer) +{ + resource_size_t xlat_align, size_align, size_max; + struct perf_ctx *perf = peer->perf; + int ret; + + /* Get inbound MW parameters */ + ret = ntb_mw_get_align(perf->ntb, peer->pidx, perf->gidx, + &xlat_align, &size_align, &size_max); + if (ret) { + dev_err(&perf->ntb->dev, "Couldn't get inbuf restrictions\n"); + return ret; + } + + if (peer->inbuf_size > size_max) { + dev_err(&perf->ntb->dev, "Too big inbuf size %pa > %pa\n", + &peer->inbuf_size, &size_max); + return -EINVAL; + } + + peer->inbuf_size = round_up(peer->inbuf_size, size_align); + + perf_free_inbuf(peer); + + peer->inbuf = dma_alloc_coherent(&perf->ntb->pdev->dev, + peer->inbuf_size, &peer->inbuf_xlat, + GFP_KERNEL); + if (!peer->inbuf) { + dev_err(&perf->ntb->dev, "Failed to alloc inbuf of %pa\n", + &peer->inbuf_size); + return -ENOMEM; + } + if (!IS_ALIGNED(peer->inbuf_xlat, xlat_align)) { + ret = -EINVAL; + dev_err(&perf->ntb->dev, "Unaligned inbuf allocated\n"); + goto err_free_inbuf; + } + + ret = ntb_mw_set_trans(perf->ntb, peer->pidx, peer->gidx, + peer->inbuf_xlat, peer->inbuf_size); + if (ret) { + dev_err(&perf->ntb->dev, "Failed to set inbuf translation\n"); + goto err_free_inbuf; + } + + /* + * We submit inbuf xlat transmission cmd for execution here to follow + * the code architecture, even though this method is called from service + * work itself so the command will be executed right after it returns. + */ + (void)perf_cmd_exec(peer, PERF_CMD_SXLAT); + + return 0; + +err_free_inbuf: + perf_free_inbuf(peer); + + return ret; +} + +static void perf_service_work(struct work_struct *work) +{ + struct perf_peer *peer = to_peer_service(work); + + if (test_and_clear_bit(PERF_CMD_SSIZE, &peer->sts)) + perf_cmd_send(peer, PERF_CMD_SSIZE, peer->outbuf_size); + + if (test_and_clear_bit(PERF_CMD_RSIZE, &peer->sts)) + perf_setup_inbuf(peer); + + if (test_and_clear_bit(PERF_CMD_SXLAT, &peer->sts)) + perf_cmd_send(peer, PERF_CMD_SXLAT, peer->inbuf_xlat); + + if (test_and_clear_bit(PERF_CMD_RXLAT, &peer->sts)) + perf_setup_outbuf(peer); + + if (test_and_clear_bit(PERF_CMD_CLEAR, &peer->sts)) { + init_completion(&peer->init_comp); + clear_bit(PERF_STS_DONE, &peer->sts); + if (test_bit(0, &peer->perf->busy_flag) && + peer == peer->perf->test_peer) { + dev_warn(&peer->perf->ntb->dev, + "Freeing while test on-fly\n"); + perf_terminate_test(peer->perf); + } + perf_free_outbuf(peer); + perf_free_inbuf(peer); + } +} + +static int perf_init_service(struct perf_ctx *perf) +{ + u64 mask; + + if (ntb_peer_mw_count(perf->ntb) < perf->pcnt) { + dev_err(&perf->ntb->dev, "Not enough memory windows\n"); + return -EINVAL; + } + + if (ntb_msg_count(perf->ntb) >= PERF_MSG_CNT) { + perf->cmd_send = perf_msg_cmd_send; + perf->cmd_recv = perf_msg_cmd_recv; + + dev_dbg(&perf->ntb->dev, "Message service initialized\n"); + + return 0; + } + + dev_dbg(&perf->ntb->dev, "Message service unsupported\n"); + + mask = GENMASK_ULL(perf->pcnt, 0); + if (ntb_spad_count(perf->ntb) >= PERF_SPAD_CNT(perf->pcnt) && + (ntb_db_valid_mask(perf->ntb) & mask) == mask) { + perf->cmd_send = perf_spad_cmd_send; + perf->cmd_recv = perf_spad_cmd_recv; + + dev_dbg(&perf->ntb->dev, "Scratchpad service initialized\n"); + + return 0; + } + + dev_dbg(&perf->ntb->dev, "Scratchpad service unsupported\n"); + + dev_err(&perf->ntb->dev, "Command services unsupported\n"); + + return -EINVAL; +} + +static int perf_enable_service(struct perf_ctx *perf) +{ + u64 mask, incmd_bit; + int ret, sidx, scnt; + + mask = ntb_db_valid_mask(perf->ntb); + (void)ntb_db_set_mask(perf->ntb, mask); + + ret = ntb_set_ctx(perf->ntb, perf, &perf_ops); + if (ret) + return ret; + + if (perf->cmd_send == perf_msg_cmd_send) { + u64 inbits, outbits; + + inbits = ntb_msg_inbits(perf->ntb); + outbits = ntb_msg_outbits(perf->ntb); + (void)ntb_msg_set_mask(perf->ntb, inbits | outbits); + + incmd_bit = BIT_ULL(__ffs64(inbits)); + ret = ntb_msg_clear_mask(perf->ntb, incmd_bit); + + dev_dbg(&perf->ntb->dev, "MSG sts unmasked %#llx\n", incmd_bit); + } else { + scnt = ntb_spad_count(perf->ntb); + for (sidx = 0; sidx < scnt; sidx++) + ntb_spad_write(perf->ntb, sidx, PERF_CMD_INVAL); + incmd_bit = PERF_SPAD_NOTIFY(perf->gidx); + ret = ntb_db_clear_mask(perf->ntb, incmd_bit); + + dev_dbg(&perf->ntb->dev, "DB bits unmasked %#llx\n", incmd_bit); + } + if (ret) { + ntb_clear_ctx(perf->ntb); + return ret; + } + + ntb_link_enable(perf->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); + /* Might be not necessary */ + ntb_link_event(perf->ntb); + + return 0; +} + +static void perf_disable_service(struct perf_ctx *perf) +{ + int pidx; + + if (perf->cmd_send == perf_msg_cmd_send) { + u64 inbits; + + inbits = ntb_msg_inbits(perf->ntb); + (void)ntb_msg_set_mask(perf->ntb, inbits); + } else { + (void)ntb_db_set_mask(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx)); + } + + ntb_clear_ctx(perf->ntb); + + for (pidx = 0; pidx < perf->pcnt; pidx++) + perf_cmd_exec(&perf->peers[pidx], PERF_CMD_CLEAR); + + for (pidx = 0; pidx < perf->pcnt; pidx++) + flush_work(&perf->peers[pidx].service); + + for (pidx = 0; pidx < perf->pcnt; pidx++) { + struct perf_peer *peer = &perf->peers[pidx]; + + ntb_spad_write(perf->ntb, PERF_SPAD_CMD(peer->gidx), 0); + } + + ntb_db_clear(perf->ntb, PERF_SPAD_NOTIFY(perf->gidx)); + + ntb_link_disable(perf->ntb); +} + +/*============================================================================== + * Performance measuring work-thread + *============================================================================== + */ + +static void perf_dma_copy_callback(void *data) +{ + struct perf_thread *pthr = data; + + atomic_dec(&pthr->dma_sync); + wake_up(&pthr->dma_wait); +} + +static int perf_copy_chunk(struct perf_thread *pthr, + void __iomem *dst, void *src, size_t len) +{ + struct dma_async_tx_descriptor *tx; + struct dmaengine_unmap_data *unmap; + struct device *dma_dev; + int try = 0, ret = 0; + struct perf_peer *peer = pthr->perf->test_peer; + void __iomem *vbase; + void __iomem *dst_vaddr; + dma_addr_t dst_dma_addr; + + if (!use_dma) { + memcpy_toio(dst, src, len); + goto ret_check_tsync; + } + + dma_dev = pthr->dma_chan->device->dev; + + if (!is_dma_copy_aligned(pthr->dma_chan->device, offset_in_page(src), + offset_in_page(dst), len)) + return -EIO; + + vbase = peer->outbuf; + dst_vaddr = dst; + dst_dma_addr = peer->dma_dst_addr + (dst_vaddr - vbase); + + unmap = dmaengine_get_unmap_data(dma_dev, 1, GFP_NOWAIT); + if (!unmap) + return -ENOMEM; + + unmap->len = len; + unmap->addr[0] = dma_map_page(dma_dev, virt_to_page(src), + offset_in_page(src), len, DMA_TO_DEVICE); + if (dma_mapping_error(dma_dev, unmap->addr[0])) { + ret = -EIO; + goto err_free_resource; + } + unmap->to_cnt = 1; + + do { + tx = dmaengine_prep_dma_memcpy(pthr->dma_chan, dst_dma_addr, + unmap->addr[0], len, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tx) + msleep(DMA_MDELAY); + } while (!tx && (try++ < DMA_TRIES)); + + if (!tx) { + ret = -EIO; + goto err_free_resource; + } + + tx->callback = perf_dma_copy_callback; + tx->callback_param = pthr; + dma_set_unmap(tx, unmap); + + ret = dma_submit_error(dmaengine_submit(tx)); + if (ret) { + dmaengine_unmap_put(unmap); + goto err_free_resource; + } + + dmaengine_unmap_put(unmap); + + atomic_inc(&pthr->dma_sync); + dma_async_issue_pending(pthr->dma_chan); + +ret_check_tsync: + return likely(atomic_read(&pthr->perf->tsync) > 0) ? 0 : -EINTR; + +err_free_resource: + dmaengine_unmap_put(unmap); + + return ret; +} + +static bool perf_dma_filter(struct dma_chan *chan, void *data) +{ + struct perf_ctx *perf = data; + int node; + + node = dev_to_node(&perf->ntb->dev); + + return node == NUMA_NO_NODE || node == dev_to_node(chan->device->dev); +} + +static int perf_init_test(struct perf_thread *pthr) +{ + struct perf_ctx *perf = pthr->perf; + dma_cap_mask_t dma_mask; + struct perf_peer *peer = pthr->perf->test_peer; + + pthr->src = kmalloc_node(perf->test_peer->outbuf_size, GFP_KERNEL, + dev_to_node(&perf->ntb->dev)); + if (!pthr->src) + return -ENOMEM; + + get_random_bytes(pthr->src, perf->test_peer->outbuf_size); + + if (!use_dma) + return 0; + + dma_cap_zero(dma_mask); + dma_cap_set(DMA_MEMCPY, dma_mask); + pthr->dma_chan = dma_request_channel(dma_mask, perf_dma_filter, perf); + if (!pthr->dma_chan) { + dev_err(&perf->ntb->dev, "%d: Failed to get DMA channel\n", + pthr->tidx); + goto err_free; + } + peer->dma_dst_addr = + dma_map_resource(pthr->dma_chan->device->dev, + peer->out_phys_addr, peer->outbuf_size, + DMA_FROM_DEVICE, 0); + if (dma_mapping_error(pthr->dma_chan->device->dev, + peer->dma_dst_addr)) { + dev_err(pthr->dma_chan->device->dev, "%d: Failed to map DMA addr\n", + pthr->tidx); + peer->dma_dst_addr = 0; + dma_release_channel(pthr->dma_chan); + goto err_free; + } + dev_dbg(pthr->dma_chan->device->dev, "%d: Map MMIO %pa to DMA addr %pad\n", + pthr->tidx, + &peer->out_phys_addr, + &peer->dma_dst_addr); + + atomic_set(&pthr->dma_sync, 0); + return 0; + +err_free: + atomic_dec(&perf->tsync); + wake_up(&perf->twait); + kfree(pthr->src); + return -ENODEV; +} + +static int perf_run_test(struct perf_thread *pthr) +{ + struct perf_peer *peer = pthr->perf->test_peer; + struct perf_ctx *perf = pthr->perf; + void __iomem *flt_dst, *bnd_dst; + u64 total_size, chunk_size; + void *flt_src; + int ret = 0; + + total_size = 1ULL << total_order; + chunk_size = 1ULL << chunk_order; + chunk_size = min_t(u64, peer->outbuf_size, chunk_size); + + flt_src = pthr->src; + bnd_dst = peer->outbuf + peer->outbuf_size; + flt_dst = peer->outbuf; + + pthr->duration = ktime_get(); + + /* Copied field is cleared on test launch stage */ + while (pthr->copied < total_size) { + ret = perf_copy_chunk(pthr, flt_dst, flt_src, chunk_size); + if (ret) { + dev_err(&perf->ntb->dev, "%d: Got error %d on test\n", + pthr->tidx, ret); + return ret; + } + + pthr->copied += chunk_size; + + flt_dst += chunk_size; + flt_src += chunk_size; + if (flt_dst >= bnd_dst || flt_dst < peer->outbuf) { + flt_dst = peer->outbuf; + flt_src = pthr->src; + } + + /* Give up CPU to give a chance for other threads to use it */ + schedule(); + } + + return 0; +} + +static int perf_sync_test(struct perf_thread *pthr) +{ + struct perf_ctx *perf = pthr->perf; + + if (!use_dma) + goto no_dma_ret; + + wait_event(pthr->dma_wait, + (atomic_read(&pthr->dma_sync) == 0 || + atomic_read(&perf->tsync) < 0)); + + if (atomic_read(&perf->tsync) < 0) + return -EINTR; + +no_dma_ret: + pthr->duration = ktime_sub(ktime_get(), pthr->duration); + + dev_dbg(&perf->ntb->dev, "%d: copied %llu bytes\n", + pthr->tidx, pthr->copied); + + dev_dbg(&perf->ntb->dev, "%d: lasted %llu usecs\n", + pthr->tidx, ktime_to_us(pthr->duration)); + + dev_dbg(&perf->ntb->dev, "%d: %llu MBytes/s\n", pthr->tidx, + div64_u64(pthr->copied, ktime_to_us(pthr->duration))); + + return 0; +} + +static void perf_clear_test(struct perf_thread *pthr) +{ + struct perf_ctx *perf = pthr->perf; + + if (!use_dma) + goto no_dma_notify; + + /* + * If test finished without errors, termination isn't needed. + * We call it anyway just to be sure of the transfers completion. + */ + (void)dmaengine_terminate_sync(pthr->dma_chan); + if (pthr->perf->test_peer->dma_dst_addr) + dma_unmap_resource(pthr->dma_chan->device->dev, + pthr->perf->test_peer->dma_dst_addr, + pthr->perf->test_peer->outbuf_size, + DMA_FROM_DEVICE, 0); + + dma_release_channel(pthr->dma_chan); + +no_dma_notify: + atomic_dec(&perf->tsync); + wake_up(&perf->twait); + kfree(pthr->src); +} + +static void perf_thread_work(struct work_struct *work) +{ + struct perf_thread *pthr = to_thread_work(work); + int ret; + + /* + * Perform stages in compliance with use_dma flag value. + * Test status is changed only if error happened, otherwise + * status -ENODATA is kept while test is on-fly. Results + * synchronization is performed only if test fininshed + * without an error or interruption. + */ + ret = perf_init_test(pthr); + if (ret) { + pthr->status = ret; + return; + } + + ret = perf_run_test(pthr); + if (ret) { + pthr->status = ret; + goto err_clear_test; + } + + pthr->status = perf_sync_test(pthr); + +err_clear_test: + perf_clear_test(pthr); +} + +static int perf_set_tcnt(struct perf_ctx *perf, u8 tcnt) +{ + if (tcnt == 0 || tcnt > MAX_THREADS_CNT) + return -EINVAL; + + if (test_and_set_bit_lock(0, &perf->busy_flag)) + return -EBUSY; + + perf->tcnt = tcnt; + + clear_bit_unlock(0, &perf->busy_flag); + + return 0; +} + +static void perf_terminate_test(struct perf_ctx *perf) +{ + int tidx; + + atomic_set(&perf->tsync, -1); + wake_up(&perf->twait); + + for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) { + wake_up(&perf->threads[tidx].dma_wait); + cancel_work_sync(&perf->threads[tidx].work); + } +} + +static int perf_submit_test(struct perf_peer *peer) +{ + struct perf_ctx *perf = peer->perf; + struct perf_thread *pthr; + int tidx, ret; + + ret = wait_for_completion_interruptible(&peer->init_comp); + if (ret < 0) + return ret; + + if (test_and_set_bit_lock(0, &perf->busy_flag)) + return -EBUSY; + + perf->test_peer = peer; + atomic_set(&perf->tsync, perf->tcnt); + + for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) { + pthr = &perf->threads[tidx]; + + pthr->status = -ENODATA; + pthr->copied = 0; + pthr->duration = ktime_set(0, 0); + if (tidx < perf->tcnt) + (void)queue_work(perf_wq, &pthr->work); + } + + ret = wait_event_interruptible(perf->twait, + atomic_read(&perf->tsync) <= 0); + if (ret == -ERESTARTSYS) { + perf_terminate_test(perf); + ret = -EINTR; + } + + clear_bit_unlock(0, &perf->busy_flag); + + return ret; +} + +static int perf_read_stats(struct perf_ctx *perf, char *buf, + size_t size, ssize_t *pos) +{ + struct perf_thread *pthr; + int tidx; + + if (test_and_set_bit_lock(0, &perf->busy_flag)) + return -EBUSY; + + (*pos) += scnprintf(buf + *pos, size - *pos, + " Peer %d test statistics:\n", perf->test_peer->pidx); + + for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) { + pthr = &perf->threads[tidx]; + + if (pthr->status == -ENODATA) + continue; + + if (pthr->status) { + (*pos) += scnprintf(buf + *pos, size - *pos, + "%d: error status %d\n", tidx, pthr->status); + continue; + } + + (*pos) += scnprintf(buf + *pos, size - *pos, + "%d: copied %llu bytes in %llu usecs, %llu MBytes/s\n", + tidx, pthr->copied, ktime_to_us(pthr->duration), + div64_u64(pthr->copied, ktime_to_us(pthr->duration))); + } + + clear_bit_unlock(0, &perf->busy_flag); + + return 0; +} + +static void perf_init_threads(struct perf_ctx *perf) +{ + struct perf_thread *pthr; + int tidx; + + perf->tcnt = DEF_THREADS_CNT; + perf->test_peer = &perf->peers[0]; + init_waitqueue_head(&perf->twait); + + for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) { + pthr = &perf->threads[tidx]; + + pthr->perf = perf; + pthr->tidx = tidx; + pthr->status = -ENODATA; + init_waitqueue_head(&pthr->dma_wait); + INIT_WORK(&pthr->work, perf_thread_work); + } +} + +static void perf_clear_threads(struct perf_ctx *perf) +{ + perf_terminate_test(perf); +} + +/*============================================================================== + * DebugFS nodes + *============================================================================== + */ + +static ssize_t perf_dbgfs_read_info(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct perf_ctx *perf = filep->private_data; + struct perf_peer *peer; + size_t buf_size; + ssize_t pos = 0; + int ret, pidx; + char *buf; + + buf_size = min_t(size_t, size, 0x1000U); + + buf = kmalloc(buf_size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + pos += scnprintf(buf + pos, buf_size - pos, + " Performance measuring tool info:\n\n"); + + pos += scnprintf(buf + pos, buf_size - pos, + "Local port %d, Global index %d\n", ntb_port_number(perf->ntb), + perf->gidx); + pos += scnprintf(buf + pos, buf_size - pos, "Test status: "); + if (test_bit(0, &perf->busy_flag)) { + pos += scnprintf(buf + pos, buf_size - pos, + "on-fly with port %d (%d)\n", + ntb_peer_port_number(perf->ntb, perf->test_peer->pidx), + perf->test_peer->pidx); + } else { + pos += scnprintf(buf + pos, buf_size - pos, "idle\n"); + } + + for (pidx = 0; pidx < perf->pcnt; pidx++) { + peer = &perf->peers[pidx]; + + pos += scnprintf(buf + pos, buf_size - pos, + "Port %d (%d), Global index %d:\n", + ntb_peer_port_number(perf->ntb, peer->pidx), peer->pidx, + peer->gidx); + + pos += scnprintf(buf + pos, buf_size - pos, + "\tLink status: %s\n", + test_bit(PERF_STS_LNKUP, &peer->sts) ? "up" : "down"); + + pos += scnprintf(buf + pos, buf_size - pos, + "\tOut buffer addr 0x%pK\n", peer->outbuf); + + pos += scnprintf(buf + pos, buf_size - pos, + "\tOut buff phys addr %pa[p]\n", &peer->out_phys_addr); + + pos += scnprintf(buf + pos, buf_size - pos, + "\tOut buffer size %pa\n", &peer->outbuf_size); + + pos += scnprintf(buf + pos, buf_size - pos, + "\tOut buffer xlat 0x%016llx[p]\n", peer->outbuf_xlat); + + if (!peer->inbuf) { + pos += scnprintf(buf + pos, buf_size - pos, + "\tIn buffer addr: unallocated\n"); + continue; + } + + pos += scnprintf(buf + pos, buf_size - pos, + "\tIn buffer addr 0x%pK\n", peer->inbuf); + + pos += scnprintf(buf + pos, buf_size - pos, + "\tIn buffer size %pa\n", &peer->inbuf_size); + + pos += scnprintf(buf + pos, buf_size - pos, + "\tIn buffer xlat %pad[p]\n", &peer->inbuf_xlat); + } + + ret = simple_read_from_buffer(ubuf, size, offp, buf, pos); + kfree(buf); + + return ret; +} + +static const struct file_operations perf_dbgfs_info = { + .open = simple_open, + .read = perf_dbgfs_read_info +}; + +static ssize_t perf_dbgfs_read_run(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct perf_ctx *perf = filep->private_data; + ssize_t ret, pos = 0; + char *buf; + + buf = kmalloc(PERF_BUF_LEN, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = perf_read_stats(perf, buf, PERF_BUF_LEN, &pos); + if (ret) + goto err_free; + + ret = simple_read_from_buffer(ubuf, size, offp, buf, pos); +err_free: + kfree(buf); + + return ret; +} + +static ssize_t perf_dbgfs_write_run(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct perf_ctx *perf = filep->private_data; + struct perf_peer *peer; + int pidx, ret; + + ret = kstrtoint_from_user(ubuf, size, 0, &pidx); + if (ret) + return ret; + + if (pidx < 0 || pidx >= perf->pcnt) + return -EINVAL; + + peer = &perf->peers[pidx]; + + ret = perf_submit_test(peer); + if (ret) + return ret; + + return size; +} + +static const struct file_operations perf_dbgfs_run = { + .open = simple_open, + .read = perf_dbgfs_read_run, + .write = perf_dbgfs_write_run +}; + +static ssize_t perf_dbgfs_read_tcnt(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct perf_ctx *perf = filep->private_data; + char buf[8]; + ssize_t pos; + + pos = scnprintf(buf, sizeof(buf), "%hhu\n", perf->tcnt); + + return simple_read_from_buffer(ubuf, size, offp, buf, pos); +} + +static ssize_t perf_dbgfs_write_tcnt(struct file *filep, + const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct perf_ctx *perf = filep->private_data; + int ret; + u8 val; + + ret = kstrtou8_from_user(ubuf, size, 0, &val); + if (ret) + return ret; + + ret = perf_set_tcnt(perf, val); + if (ret) + return ret; + + return size; +} + +static const struct file_operations perf_dbgfs_tcnt = { + .open = simple_open, + .read = perf_dbgfs_read_tcnt, + .write = perf_dbgfs_write_tcnt +}; + +static void perf_setup_dbgfs(struct perf_ctx *perf) +{ + struct pci_dev *pdev = perf->ntb->pdev; + + perf->dbgfs_dir = debugfs_create_dir(pci_name(pdev), perf_dbgfs_topdir); + if (!perf->dbgfs_dir) { + dev_warn(&perf->ntb->dev, "DebugFS unsupported\n"); + return; + } + + debugfs_create_file("info", 0600, perf->dbgfs_dir, perf, + &perf_dbgfs_info); + + debugfs_create_file("run", 0600, perf->dbgfs_dir, perf, + &perf_dbgfs_run); + + debugfs_create_file("threads_count", 0600, perf->dbgfs_dir, perf, + &perf_dbgfs_tcnt); + + /* They are made read-only for test exec safety and integrity */ + debugfs_create_u8("chunk_order", 0500, perf->dbgfs_dir, &chunk_order); + + debugfs_create_u8("total_order", 0500, perf->dbgfs_dir, &total_order); + + debugfs_create_bool("use_dma", 0500, perf->dbgfs_dir, &use_dma); +} + +static void perf_clear_dbgfs(struct perf_ctx *perf) +{ + debugfs_remove_recursive(perf->dbgfs_dir); +} + +/*============================================================================== + * Basic driver initialization + *============================================================================== + */ + +static struct perf_ctx *perf_create_data(struct ntb_dev *ntb) +{ + struct perf_ctx *perf; + + perf = devm_kzalloc(&ntb->dev, sizeof(*perf), GFP_KERNEL); + if (!perf) + return ERR_PTR(-ENOMEM); + + perf->pcnt = ntb_peer_port_count(ntb); + perf->peers = devm_kcalloc(&ntb->dev, perf->pcnt, sizeof(*perf->peers), + GFP_KERNEL); + if (!perf->peers) + return ERR_PTR(-ENOMEM); + + perf->ntb = ntb; + + return perf; +} + +static int perf_setup_peer_mw(struct perf_peer *peer) +{ + struct perf_ctx *perf = peer->perf; + phys_addr_t phys_addr; + int ret; + + /* Get outbound MW parameters and map it */ + ret = ntb_peer_mw_get_addr(perf->ntb, perf->gidx, &phys_addr, + &peer->outbuf_size); + if (ret) + return ret; + + peer->outbuf = devm_ioremap_wc(&perf->ntb->dev, phys_addr, + peer->outbuf_size); + if (!peer->outbuf) + return -ENOMEM; + + peer->out_phys_addr = phys_addr; + + if (max_mw_size && peer->outbuf_size > max_mw_size) { + peer->outbuf_size = max_mw_size; + dev_warn(&peer->perf->ntb->dev, + "Peer %d outbuf reduced to %pa\n", peer->pidx, + &peer->outbuf_size); + } + + return 0; +} + +static int perf_init_peers(struct perf_ctx *perf) +{ + struct perf_peer *peer; + int pidx, lport, ret; + + lport = ntb_port_number(perf->ntb); + perf->gidx = -1; + for (pidx = 0; pidx < perf->pcnt; pidx++) { + peer = &perf->peers[pidx]; + + peer->perf = perf; + peer->pidx = pidx; + if (lport < ntb_peer_port_number(perf->ntb, pidx)) { + if (perf->gidx == -1) + perf->gidx = pidx; + peer->gidx = pidx + 1; + } else { + peer->gidx = pidx; + } + INIT_WORK(&peer->service, perf_service_work); + init_completion(&peer->init_comp); + } + if (perf->gidx == -1) + perf->gidx = pidx; + + /* + * Hardware with only two ports may not have unique port + * numbers. In this case, the gidxs should all be zero. + */ + if (perf->pcnt == 1 && ntb_port_number(perf->ntb) == 0 && + ntb_peer_port_number(perf->ntb, 0) == 0) { + perf->gidx = 0; + perf->peers[0].gidx = 0; + } + + for (pidx = 0; pidx < perf->pcnt; pidx++) { + ret = perf_setup_peer_mw(&perf->peers[pidx]); + if (ret) + return ret; + } + + dev_dbg(&perf->ntb->dev, "Global port index %d\n", perf->gidx); + + return 0; +} + +static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb) +{ + struct perf_ctx *perf; + int ret; + + perf = perf_create_data(ntb); + if (IS_ERR(perf)) + return PTR_ERR(perf); + + ret = perf_init_peers(perf); + if (ret) + return ret; + + perf_init_threads(perf); + + ret = perf_init_service(perf); + if (ret) + return ret; + + ret = perf_enable_service(perf); + if (ret) + return ret; + + perf_setup_dbgfs(perf); + + return 0; +} + +static void perf_remove(struct ntb_client *client, struct ntb_dev *ntb) +{ + struct perf_ctx *perf = ntb->ctx; + + perf_clear_dbgfs(perf); + + perf_disable_service(perf); + + perf_clear_threads(perf); +} + +static struct ntb_client perf_client = { + .ops = { + .probe = perf_probe, + .remove = perf_remove + } +}; + +static int __init perf_init(void) +{ + int ret; + + if (chunk_order > MAX_CHUNK_ORDER) { + chunk_order = MAX_CHUNK_ORDER; + pr_info("Chunk order reduced to %hhu\n", chunk_order); + } + + if (total_order < chunk_order) { + total_order = chunk_order; + pr_info("Total data order reduced to %hhu\n", total_order); + } + + perf_wq = alloc_workqueue("perf_wq", WQ_UNBOUND | WQ_SYSFS, 0); + if (!perf_wq) + return -ENOMEM; + + if (debugfs_initialized()) + perf_dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, NULL); + + ret = ntb_register_client(&perf_client); + if (ret) { + debugfs_remove_recursive(perf_dbgfs_topdir); + destroy_workqueue(perf_wq); + } + + return ret; +} +module_init(perf_init); + +static void __exit perf_exit(void) +{ + ntb_unregister_client(&perf_client); + debugfs_remove_recursive(perf_dbgfs_topdir); + destroy_workqueue(perf_wq); +} +module_exit(perf_exit); diff --git a/drivers/ntb/test/ntb_pingpong.c b/drivers/ntb/test/ntb_pingpong.c new file mode 100644 index 000000000..2164e8492 --- /dev/null +++ b/drivers/ntb/test/ntb_pingpong.c @@ -0,0 +1,433 @@ +/* + * 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) 2017 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) 2017 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 Pingpong Linux driver + */ + +/* + * How to use this tool, by example. + * + * Assuming $DBG_DIR is something like: + * '/sys/kernel/debug/ntb_perf/0000:00:03.0' + * Suppose aside from local device there is at least one remote device + * connected to NTB with index 0. + *----------------------------------------------------------------------------- + * Eg: install driver with specified delay between doorbell event and response + * + * root@self# insmod ntb_pingpong.ko delay_ms=1000 + *----------------------------------------------------------------------------- + * Eg: get number of ping-pong cycles performed + * + * root@self# cat $DBG_DIR/count + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/bitops.h> + +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/hrtimer.h> +#include <linux/debugfs.h> + +#include <linux/ntb.h> + +#define DRIVER_NAME "ntb_pingpong" +#define DRIVER_VERSION "2.0" + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION(DRIVER_VERSION); +MODULE_AUTHOR("Allen Hubbe <Allen.Hubbe@emc.com>"); +MODULE_DESCRIPTION("PCIe NTB Simple Pingpong Client"); + +static unsigned int unsafe; +module_param(unsafe, uint, 0644); +MODULE_PARM_DESC(unsafe, "Run even though ntb operations may be unsafe"); + +static unsigned int delay_ms = 1000; +module_param(delay_ms, uint, 0644); +MODULE_PARM_DESC(delay_ms, "Milliseconds to delay the response to peer"); + +struct pp_ctx { + struct ntb_dev *ntb; + struct hrtimer timer; + u64 in_db; + u64 out_db; + int out_pidx; + u64 nmask; + u64 pmask; + atomic_t count; + spinlock_t lock; + struct dentry *dbgfs_dir; +}; +#define to_pp_timer(__timer) \ + container_of(__timer, struct pp_ctx, timer) + +static struct dentry *pp_dbgfs_topdir; + +static int pp_find_next_peer(struct pp_ctx *pp) +{ + u64 link, out_db; + int pidx; + + link = ntb_link_is_up(pp->ntb, NULL, NULL); + + /* Find next available peer */ + if (link & pp->nmask) + pidx = __ffs64(link & pp->nmask); + else if (link & pp->pmask) + pidx = __ffs64(link & pp->pmask); + else + return -ENODEV; + + out_db = BIT_ULL(ntb_peer_port_number(pp->ntb, pidx)); + + spin_lock(&pp->lock); + pp->out_pidx = pidx; + pp->out_db = out_db; + spin_unlock(&pp->lock); + + return 0; +} + +static void pp_setup(struct pp_ctx *pp) +{ + int ret; + + ntb_db_set_mask(pp->ntb, pp->in_db); + + hrtimer_cancel(&pp->timer); + + ret = pp_find_next_peer(pp); + if (ret == -ENODEV) { + dev_dbg(&pp->ntb->dev, "Got no peers, so cancel\n"); + return; + } + + dev_dbg(&pp->ntb->dev, "Ping-pong started with port %d, db %#llx\n", + ntb_peer_port_number(pp->ntb, pp->out_pidx), pp->out_db); + + hrtimer_start(&pp->timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL); +} + +static void pp_clear(struct pp_ctx *pp) +{ + hrtimer_cancel(&pp->timer); + + ntb_db_set_mask(pp->ntb, pp->in_db); + + dev_dbg(&pp->ntb->dev, "Ping-pong cancelled\n"); +} + +static void pp_ping(struct pp_ctx *pp) +{ + u32 count; + + count = atomic_read(&pp->count); + + spin_lock(&pp->lock); + ntb_peer_spad_write(pp->ntb, pp->out_pidx, 0, count); + ntb_peer_msg_write(pp->ntb, pp->out_pidx, 0, count); + + dev_dbg(&pp->ntb->dev, "Ping port %d spad %#x, msg %#x\n", + ntb_peer_port_number(pp->ntb, pp->out_pidx), count, count); + + ntb_peer_db_set(pp->ntb, pp->out_db); + ntb_db_clear_mask(pp->ntb, pp->in_db); + spin_unlock(&pp->lock); +} + +static void pp_pong(struct pp_ctx *pp) +{ + u32 msg_data = -1, spad_data = -1; + int pidx = 0; + + /* Read pong data */ + spad_data = ntb_spad_read(pp->ntb, 0); + msg_data = ntb_msg_read(pp->ntb, &pidx, 0); + ntb_msg_clear_sts(pp->ntb, -1); + + /* + * Scratchpad and message data may differ, since message register can't + * be rewritten unless status is cleared. Additionally either of them + * might be unsupported + */ + dev_dbg(&pp->ntb->dev, "Pong spad %#x, msg %#x (port %d)\n", + spad_data, msg_data, ntb_peer_port_number(pp->ntb, pidx)); + + atomic_inc(&pp->count); + + ntb_db_set_mask(pp->ntb, pp->in_db); + ntb_db_clear(pp->ntb, pp->in_db); + + hrtimer_start(&pp->timer, ms_to_ktime(delay_ms), HRTIMER_MODE_REL); +} + +static enum hrtimer_restart pp_timer_func(struct hrtimer *t) +{ + struct pp_ctx *pp = to_pp_timer(t); + + pp_ping(pp); + + return HRTIMER_NORESTART; +} + +static void pp_link_event(void *ctx) +{ + struct pp_ctx *pp = ctx; + + pp_setup(pp); +} + +static void pp_db_event(void *ctx, int vec) +{ + struct pp_ctx *pp = ctx; + + pp_pong(pp); +} + +static const struct ntb_ctx_ops pp_ops = { + .link_event = pp_link_event, + .db_event = pp_db_event +}; + +static int pp_check_ntb(struct ntb_dev *ntb) +{ + u64 pmask; + + if (ntb_db_is_unsafe(ntb)) { + dev_dbg(&ntb->dev, "Doorbell is unsafe\n"); + if (!unsafe) + return -EINVAL; + } + + if (ntb_spad_is_unsafe(ntb)) { + dev_dbg(&ntb->dev, "Scratchpad is unsafe\n"); + if (!unsafe) + return -EINVAL; + } + + pmask = GENMASK_ULL(ntb_peer_port_count(ntb), 0); + if ((ntb_db_valid_mask(ntb) & pmask) != pmask) { + dev_err(&ntb->dev, "Unsupported DB configuration\n"); + return -EINVAL; + } + + if (ntb_spad_count(ntb) < 1 && ntb_msg_count(ntb) < 1) { + dev_err(&ntb->dev, "Scratchpads and messages unsupported\n"); + return -EINVAL; + } else if (ntb_spad_count(ntb) < 1) { + dev_dbg(&ntb->dev, "Scratchpads unsupported\n"); + } else if (ntb_msg_count(ntb) < 1) { + dev_dbg(&ntb->dev, "Messages unsupported\n"); + } + + return 0; +} + +static struct pp_ctx *pp_create_data(struct ntb_dev *ntb) +{ + struct pp_ctx *pp; + + pp = devm_kzalloc(&ntb->dev, sizeof(*pp), GFP_KERNEL); + if (!pp) + return ERR_PTR(-ENOMEM); + + pp->ntb = ntb; + atomic_set(&pp->count, 0); + spin_lock_init(&pp->lock); + hrtimer_init(&pp->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + pp->timer.function = pp_timer_func; + + return pp; +} + +static void pp_init_flds(struct pp_ctx *pp) +{ + int pidx, lport, pcnt; + + /* Find global port index */ + lport = ntb_port_number(pp->ntb); + pcnt = ntb_peer_port_count(pp->ntb); + for (pidx = 0; pidx < pcnt; pidx++) { + if (lport < ntb_peer_port_number(pp->ntb, pidx)) + break; + } + + pp->in_db = BIT_ULL(lport); + pp->pmask = GENMASK_ULL(pidx, 0) >> 1; + pp->nmask = GENMASK_ULL(pcnt - 1, pidx); + + dev_dbg(&pp->ntb->dev, "Inbound db %#llx, prev %#llx, next %#llx\n", + pp->in_db, pp->pmask, pp->nmask); +} + +static int pp_mask_events(struct pp_ctx *pp) +{ + u64 db_mask, msg_mask; + int ret; + + db_mask = ntb_db_valid_mask(pp->ntb); + ret = ntb_db_set_mask(pp->ntb, db_mask); + if (ret) + return ret; + + /* Skip message events masking if unsupported */ + if (ntb_msg_count(pp->ntb) < 1) + return 0; + + msg_mask = ntb_msg_outbits(pp->ntb) | ntb_msg_inbits(pp->ntb); + return ntb_msg_set_mask(pp->ntb, msg_mask); +} + +static int pp_setup_ctx(struct pp_ctx *pp) +{ + int ret; + + ret = ntb_set_ctx(pp->ntb, pp, &pp_ops); + if (ret) + return ret; + + ntb_link_enable(pp->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); + /* Might be not necessary */ + ntb_link_event(pp->ntb); + + return 0; +} + +static void pp_clear_ctx(struct pp_ctx *pp) +{ + ntb_link_disable(pp->ntb); + + ntb_clear_ctx(pp->ntb); +} + +static void pp_setup_dbgfs(struct pp_ctx *pp) +{ + struct pci_dev *pdev = pp->ntb->pdev; + + pp->dbgfs_dir = debugfs_create_dir(pci_name(pdev), pp_dbgfs_topdir); + + debugfs_create_atomic_t("count", 0600, pp->dbgfs_dir, &pp->count); +} + +static void pp_clear_dbgfs(struct pp_ctx *pp) +{ + debugfs_remove_recursive(pp->dbgfs_dir); +} + +static int pp_probe(struct ntb_client *client, struct ntb_dev *ntb) +{ + struct pp_ctx *pp; + int ret; + + ret = pp_check_ntb(ntb); + if (ret) + return ret; + + pp = pp_create_data(ntb); + if (IS_ERR(pp)) + return PTR_ERR(pp); + + pp_init_flds(pp); + + ret = pp_mask_events(pp); + if (ret) + return ret; + + ret = pp_setup_ctx(pp); + if (ret) + return ret; + + pp_setup_dbgfs(pp); + + return 0; +} + +static void pp_remove(struct ntb_client *client, struct ntb_dev *ntb) +{ + struct pp_ctx *pp = ntb->ctx; + + pp_clear_dbgfs(pp); + + pp_clear_ctx(pp); + + pp_clear(pp); +} + +static struct ntb_client pp_client = { + .ops = { + .probe = pp_probe, + .remove = pp_remove + } +}; + +static int __init pp_init(void) +{ + int ret; + + if (debugfs_initialized()) + pp_dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, NULL); + + ret = ntb_register_client(&pp_client); + if (ret) + debugfs_remove_recursive(pp_dbgfs_topdir); + + return ret; +} +module_init(pp_init); + +static void __exit pp_exit(void) +{ + ntb_unregister_client(&pp_client); + debugfs_remove_recursive(pp_dbgfs_topdir); +} +module_exit(pp_exit); diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c new file mode 100644 index 000000000..eeeb4b1c9 --- /dev/null +++ b/drivers/ntb/test/ntb_tool.c @@ -0,0 +1,1696 @@ +/* + * 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) 2017 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) 2017 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 Debugging Tool Linux driver + */ + +/* + * How to use this tool, by example. + * + * Assuming $DBG_DIR is something like: + * '/sys/kernel/debug/ntb_tool/0000:00:03.0' + * Suppose aside from local device there is at least one remote device + * connected to NTB with index 0. + *----------------------------------------------------------------------------- + * Eg: check local/peer device information. + * + * # Get local device port number + * root@self# cat $DBG_DIR/port + * + * # Check local device functionality + * root@self# ls $DBG_DIR + * db msg1 msg_sts peer4/ port + * db_event msg2 peer0/ peer5/ spad0 + * db_mask msg3 peer1/ peer_db spad1 + * link msg_event peer2/ peer_db_mask spad2 + * msg0 msg_mask peer3/ peer_spad spad3 + * # As one can see it supports: + * # 1) four inbound message registers + * # 2) four inbound scratchpads + * # 3) up to six peer devices + * + * # Check peer device port number + * root@self# cat $DBG_DIR/peer0/port + * + * # Check peer device(s) functionality to be used + * root@self# ls $DBG_DIR/peer0 + * link mw_trans0 mw_trans6 port + * link_event mw_trans1 mw_trans7 spad0 + * msg0 mw_trans2 peer_mw_trans0 spad1 + * msg1 mw_trans3 peer_mw_trans1 spad2 + * msg2 mw_trans4 peer_mw_trans2 spad3 + * msg3 mw_trans5 peer_mw_trans3 + * # As one can see we got: + * # 1) four outbound message registers + * # 2) four outbound scratchpads + * # 3) eight inbound memory windows + * # 4) four outbound memory windows + *----------------------------------------------------------------------------- + * Eg: NTB link tests + * + * # Set local link up/down + * root@self# echo Y > $DBG_DIR/link + * root@self# echo N > $DBG_DIR/link + * + * # Check if link with peer device is up/down: + * root@self# cat $DBG_DIR/peer0/link + * + * # Block until the link is up/down + * root@self# echo Y > $DBG_DIR/peer0/link_event + * root@self# echo N > $DBG_DIR/peer0/link_event + *----------------------------------------------------------------------------- + * Eg: Doorbell registers tests (some functionality might be absent) + * + * # Set/clear/get local doorbell + * root@self# echo 's 1' > $DBG_DIR/db + * root@self# echo 'c 1' > $DBG_DIR/db + * root@self# cat $DBG_DIR/db + * + * # Set/clear/get local doorbell mask + * root@self# echo 's 1' > $DBG_DIR/db_mask + * root@self# echo 'c 1' > $DBG_DIR/db_mask + * root@self# cat $DBG_DIR/db_mask + * + * # Ring/clear/get peer doorbell + * root@peer# echo 's 1' > $DBG_DIR/peer_db + * root@peer# echo 'c 1' > $DBG_DIR/peer_db + * root@peer# cat $DBG_DIR/peer_db + * + * # Set/clear/get peer doorbell mask + * root@self# echo 's 1' > $DBG_DIR/peer_db_mask + * root@self# echo 'c 1' > $DBG_DIR/peer_db_mask + * root@self# cat $DBG_DIR/peer_db_mask + * + * # Block until local doorbell is set with specified value + * root@self# echo 1 > $DBG_DIR/db_event + *----------------------------------------------------------------------------- + * Eg: Message registers tests (functionality might be absent) + * + * # Set/clear/get in/out message registers status + * root@self# echo 's 1' > $DBG_DIR/msg_sts + * root@self# echo 'c 1' > $DBG_DIR/msg_sts + * root@self# cat $DBG_DIR/msg_sts + * + * # Set/clear in/out message registers mask + * root@self# echo 's 1' > $DBG_DIR/msg_mask + * root@self# echo 'c 1' > $DBG_DIR/msg_mask + * + * # Get inbound message register #0 value and source of port index + * root@self# cat $DBG_DIR/msg0 + * + * # Send some data to peer over outbound message register #0 + * root@self# echo 0x01020304 > $DBG_DIR/peer0/msg0 + *----------------------------------------------------------------------------- + * Eg: Scratchpad registers tests (functionality might be absent) + * + * # Write/read to/from local scratchpad register #0 + * root@peer# echo 0x01020304 > $DBG_DIR/spad0 + * root@peer# cat $DBG_DIR/spad0 + * + * # Write/read to/from peer scratchpad register #0 + * root@peer# echo 0x01020304 > $DBG_DIR/peer0/spad0 + * root@peer# cat $DBG_DIR/peer0/spad0 + *----------------------------------------------------------------------------- + * Eg: Memory windows tests + * + * # Create inbound memory window buffer of specified size/get its base address + * root@peer# echo 16384 > $DBG_DIR/peer0/mw_trans0 + * root@peer# cat $DBG_DIR/peer0/mw_trans0 + * + * # Write/read data to/from inbound memory window + * root@peer# echo Hello > $DBG_DIR/peer0/mw0 + * root@peer# head -c 7 $DBG_DIR/peer0/mw0 + * + * # Map outbound memory window/check it settings (on peer device) + * root@peer# echo 0xADD0BA5E:16384 > $DBG_DIR/peer0/peer_mw_trans0 + * root@peer# cat $DBG_DIR/peer0/peer_mw_trans0 + * + * # Write/read data to/from outbound memory window (on peer device) + * root@peer# echo olleH > $DBG_DIR/peer0/peer_mw0 + * root@peer# head -c 7 $DBG_DIR/peer0/peer_mw0 + */ + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> + +#include <linux/debugfs.h> +#include <linux/dma-mapping.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/uaccess.h> + +#include <linux/ntb.h> + +#define DRIVER_NAME "ntb_tool" +#define DRIVER_VERSION "2.0" + +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION(DRIVER_VERSION); +MODULE_AUTHOR("Allen Hubbe <Allen.Hubbe@emc.com>"); +MODULE_DESCRIPTION("PCIe NTB Debugging Tool"); + +/* + * Inbound and outbound memory windows descriptor. Union members selection + * depends on the MW type the structure describes. mm_base/dma_base are the + * virtual and DMA address of an inbound MW. io_base/tr_base are the MMIO + * mapped virtual and xlat addresses of an outbound MW respectively. + */ +struct tool_mw { + int widx; + int pidx; + struct tool_ctx *tc; + union { + u8 *mm_base; + u8 __iomem *io_base; + }; + union { + dma_addr_t dma_base; + u64 tr_base; + }; + resource_size_t size; + struct dentry *dbgfs_file; +}; + +/* + * Wrapper structure is used to distinguish the outbound MW peers reference + * within the corresponding DebugFS directory IO operation. + */ +struct tool_mw_wrap { + int pidx; + struct tool_mw *mw; +}; + +struct tool_msg { + int midx; + int pidx; + struct tool_ctx *tc; +}; + +struct tool_spad { + int sidx; + int pidx; + struct tool_ctx *tc; +}; + +struct tool_peer { + int pidx; + struct tool_ctx *tc; + int inmw_cnt; + struct tool_mw *inmws; + int outmw_cnt; + struct tool_mw_wrap *outmws; + int outmsg_cnt; + struct tool_msg *outmsgs; + int outspad_cnt; + struct tool_spad *outspads; + struct dentry *dbgfs_dir; +}; + +struct tool_ctx { + struct ntb_dev *ntb; + wait_queue_head_t link_wq; + wait_queue_head_t db_wq; + wait_queue_head_t msg_wq; + int outmw_cnt; + struct tool_mw *outmws; + int peer_cnt; + struct tool_peer *peers; + int inmsg_cnt; + struct tool_msg *inmsgs; + int inspad_cnt; + struct tool_spad *inspads; + struct dentry *dbgfs_dir; +}; + +#define TOOL_FOPS_RDWR(__name, __read, __write) \ + const struct file_operations __name = { \ + .owner = THIS_MODULE, \ + .open = simple_open, \ + .read = __read, \ + .write = __write, \ + } + +#define TOOL_BUF_LEN 32 + +static struct dentry *tool_dbgfs_topdir; + +/*============================================================================== + * NTB events handlers + *============================================================================== + */ + +static void tool_link_event(void *ctx) +{ + struct tool_ctx *tc = ctx; + enum ntb_speed speed; + enum ntb_width width; + int up; + + up = ntb_link_is_up(tc->ntb, &speed, &width); + + dev_dbg(&tc->ntb->dev, "link is %s speed %d width %d\n", + up ? "up" : "down", speed, width); + + wake_up(&tc->link_wq); +} + +static void tool_db_event(void *ctx, int vec) +{ + struct tool_ctx *tc = ctx; + u64 db_bits, db_mask; + + db_mask = ntb_db_vector_mask(tc->ntb, vec); + db_bits = ntb_db_read(tc->ntb); + + dev_dbg(&tc->ntb->dev, "doorbell vec %d mask %#llx bits %#llx\n", + vec, db_mask, db_bits); + + wake_up(&tc->db_wq); +} + +static void tool_msg_event(void *ctx) +{ + struct tool_ctx *tc = ctx; + u64 msg_sts; + + msg_sts = ntb_msg_read_sts(tc->ntb); + + dev_dbg(&tc->ntb->dev, "message bits %#llx\n", msg_sts); + + wake_up(&tc->msg_wq); +} + +static const struct ntb_ctx_ops tool_ops = { + .link_event = tool_link_event, + .db_event = tool_db_event, + .msg_event = tool_msg_event +}; + +/*============================================================================== + * Common read/write methods + *============================================================================== + */ + +static ssize_t tool_fn_read(struct tool_ctx *tc, char __user *ubuf, + size_t size, loff_t *offp, + u64 (*fn_read)(struct ntb_dev *)) +{ + size_t buf_size; + char buf[TOOL_BUF_LEN]; + ssize_t pos; + + if (!fn_read) + return -EINVAL; + + buf_size = min(size, sizeof(buf)); + + pos = scnprintf(buf, buf_size, "%#llx\n", fn_read(tc->ntb)); + + return simple_read_from_buffer(ubuf, size, offp, buf, pos); +} + +static ssize_t tool_fn_write(struct tool_ctx *tc, + const char __user *ubuf, + size_t size, loff_t *offp, + int (*fn_set)(struct ntb_dev *, u64), + int (*fn_clear)(struct ntb_dev *, u64)) +{ + char *buf, cmd; + ssize_t ret; + u64 bits; + int n; + + if (*offp) + return 0; + + buf = kmalloc(size + 1, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + if (copy_from_user(buf, ubuf, size)) { + kfree(buf); + return -EFAULT; + } + + buf[size] = 0; + + n = sscanf(buf, "%c %lli", &cmd, &bits); + + kfree(buf); + + if (n != 2) { + ret = -EINVAL; + } else if (cmd == 's') { + if (!fn_set) + ret = -EINVAL; + else + ret = fn_set(tc->ntb, bits); + } else if (cmd == 'c') { + if (!fn_clear) + ret = -EINVAL; + else + ret = fn_clear(tc->ntb, bits); + } else { + ret = -EINVAL; + } + + return ret ? : size; +} + +/*============================================================================== + * Port read/write methods + *============================================================================== + */ + +static ssize_t tool_port_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + char buf[TOOL_BUF_LEN]; + int pos; + + pos = scnprintf(buf, sizeof(buf), "%d\n", ntb_port_number(tc->ntb)); + + return simple_read_from_buffer(ubuf, size, offp, buf, pos); +} + +static TOOL_FOPS_RDWR(tool_port_fops, + tool_port_read, + NULL); + +static ssize_t tool_peer_port_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_peer *peer = filep->private_data; + struct tool_ctx *tc = peer->tc; + char buf[TOOL_BUF_LEN]; + int pos; + + pos = scnprintf(buf, sizeof(buf), "%d\n", + ntb_peer_port_number(tc->ntb, peer->pidx)); + + return simple_read_from_buffer(ubuf, size, offp, buf, pos); +} + +static TOOL_FOPS_RDWR(tool_peer_port_fops, + tool_peer_port_read, + NULL); + +static int tool_init_peers(struct tool_ctx *tc) +{ + int pidx; + + tc->peer_cnt = ntb_peer_port_count(tc->ntb); + tc->peers = devm_kcalloc(&tc->ntb->dev, tc->peer_cnt, + sizeof(*tc->peers), GFP_KERNEL); + if (tc->peers == NULL) + return -ENOMEM; + + for (pidx = 0; pidx < tc->peer_cnt; pidx++) { + tc->peers[pidx].pidx = pidx; + tc->peers[pidx].tc = tc; + } + + return 0; +} + +/*============================================================================== + * Link state read/write methods + *============================================================================== + */ + +static ssize_t tool_link_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + bool val; + int ret; + + ret = kstrtobool_from_user(ubuf, size, &val); + if (ret) + return ret; + + if (val) + ret = ntb_link_enable(tc->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); + else + ret = ntb_link_disable(tc->ntb); + + if (ret) + return ret; + + return size; +} + +static TOOL_FOPS_RDWR(tool_link_fops, + NULL, + tool_link_write); + +static ssize_t tool_peer_link_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_peer *peer = filep->private_data; + struct tool_ctx *tc = peer->tc; + char buf[3]; + + if (ntb_link_is_up(tc->ntb, NULL, NULL) & BIT(peer->pidx)) + buf[0] = 'Y'; + else + buf[0] = 'N'; + buf[1] = '\n'; + buf[2] = '\0'; + + return simple_read_from_buffer(ubuf, size, offp, buf, 2); +} + +static TOOL_FOPS_RDWR(tool_peer_link_fops, + tool_peer_link_read, + NULL); + +static ssize_t tool_peer_link_event_write(struct file *filep, + const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_peer *peer = filep->private_data; + struct tool_ctx *tc = peer->tc; + u64 link_msk; + bool val; + int ret; + + ret = kstrtobool_from_user(ubuf, size, &val); + if (ret) + return ret; + + link_msk = BIT_ULL_MASK(peer->pidx); + + if (wait_event_interruptible(tc->link_wq, + !!(ntb_link_is_up(tc->ntb, NULL, NULL) & link_msk) == val)) + return -ERESTART; + + return size; +} + +static TOOL_FOPS_RDWR(tool_peer_link_event_fops, + NULL, + tool_peer_link_event_write); + +/*============================================================================== + * Memory windows read/write/setting methods + *============================================================================== + */ + +static ssize_t tool_mw_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_mw *inmw = filep->private_data; + + if (inmw->mm_base == NULL) + return -ENXIO; + + return simple_read_from_buffer(ubuf, size, offp, + inmw->mm_base, inmw->size); +} + +static ssize_t tool_mw_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_mw *inmw = filep->private_data; + + if (inmw->mm_base == NULL) + return -ENXIO; + + return simple_write_to_buffer(inmw->mm_base, inmw->size, offp, + ubuf, size); +} + +static TOOL_FOPS_RDWR(tool_mw_fops, + tool_mw_read, + tool_mw_write); + +static int tool_setup_mw(struct tool_ctx *tc, int pidx, int widx, + size_t req_size) +{ + resource_size_t size, addr_align, size_align; + struct tool_mw *inmw = &tc->peers[pidx].inmws[widx]; + char buf[TOOL_BUF_LEN]; + int ret; + + if (inmw->mm_base != NULL) + return 0; + + ret = ntb_mw_get_align(tc->ntb, pidx, widx, &addr_align, + &size_align, &size); + if (ret) + return ret; + + inmw->size = min_t(resource_size_t, req_size, size); + inmw->size = round_up(inmw->size, addr_align); + inmw->size = round_up(inmw->size, size_align); + inmw->mm_base = dma_alloc_coherent(&tc->ntb->pdev->dev, inmw->size, + &inmw->dma_base, GFP_KERNEL); + if (!inmw->mm_base) + return -ENOMEM; + + if (!IS_ALIGNED(inmw->dma_base, addr_align)) { + ret = -ENOMEM; + goto err_free_dma; + } + + ret = ntb_mw_set_trans(tc->ntb, pidx, widx, inmw->dma_base, inmw->size); + if (ret) + goto err_free_dma; + + snprintf(buf, sizeof(buf), "mw%d", widx); + inmw->dbgfs_file = debugfs_create_file(buf, 0600, + tc->peers[pidx].dbgfs_dir, inmw, + &tool_mw_fops); + + return 0; + +err_free_dma: + dma_free_coherent(&tc->ntb->pdev->dev, inmw->size, inmw->mm_base, + inmw->dma_base); + inmw->mm_base = NULL; + inmw->dma_base = 0; + inmw->size = 0; + + return ret; +} + +static void tool_free_mw(struct tool_ctx *tc, int pidx, int widx) +{ + struct tool_mw *inmw = &tc->peers[pidx].inmws[widx]; + + debugfs_remove(inmw->dbgfs_file); + + if (inmw->mm_base != NULL) { + ntb_mw_clear_trans(tc->ntb, pidx, widx); + dma_free_coherent(&tc->ntb->pdev->dev, inmw->size, + inmw->mm_base, inmw->dma_base); + } + + inmw->mm_base = NULL; + inmw->dma_base = 0; + inmw->size = 0; + inmw->dbgfs_file = NULL; +} + +static ssize_t tool_mw_trans_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_mw *inmw = filep->private_data; + resource_size_t addr_align; + resource_size_t size_align; + resource_size_t size_max; + ssize_t ret, off = 0; + size_t buf_size; + char *buf; + + buf_size = min_t(size_t, size, 512); + + buf = kmalloc(buf_size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = ntb_mw_get_align(inmw->tc->ntb, inmw->pidx, inmw->widx, + &addr_align, &size_align, &size_max); + if (ret) + goto err; + + off += scnprintf(buf + off, buf_size - off, + "Inbound MW \t%d\n", + inmw->widx); + + off += scnprintf(buf + off, buf_size - off, + "Port \t%d (%d)\n", + ntb_peer_port_number(inmw->tc->ntb, inmw->pidx), + inmw->pidx); + + off += scnprintf(buf + off, buf_size - off, + "Window Address \t0x%pK\n", inmw->mm_base); + + off += scnprintf(buf + off, buf_size - off, + "DMA Address \t%pad\n", + &inmw->dma_base); + + off += scnprintf(buf + off, buf_size - off, + "Window Size \t%pap\n", + &inmw->size); + + off += scnprintf(buf + off, buf_size - off, + "Alignment \t%pap\n", + &addr_align); + + off += scnprintf(buf + off, buf_size - off, + "Size Alignment \t%pap\n", + &size_align); + + off += scnprintf(buf + off, buf_size - off, + "Size Max \t%pap\n", + &size_max); + + ret = simple_read_from_buffer(ubuf, size, offp, buf, off); + +err: + kfree(buf); + + return ret; +} + +static ssize_t tool_mw_trans_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_mw *inmw = filep->private_data; + unsigned int val; + int ret; + + ret = kstrtouint_from_user(ubuf, size, 0, &val); + if (ret) + return ret; + + tool_free_mw(inmw->tc, inmw->pidx, inmw->widx); + if (val) { + ret = tool_setup_mw(inmw->tc, inmw->pidx, inmw->widx, val); + if (ret) + return ret; + } + + return size; +} + +static TOOL_FOPS_RDWR(tool_mw_trans_fops, + tool_mw_trans_read, + tool_mw_trans_write); + +static ssize_t tool_peer_mw_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_mw *outmw = filep->private_data; + loff_t pos = *offp; + ssize_t ret; + void *buf; + + if (outmw->io_base == NULL) + return -EIO; + + if (pos >= outmw->size || !size) + return 0; + + if (size > outmw->size - pos) + size = outmw->size - pos; + + buf = kmalloc(size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + memcpy_fromio(buf, outmw->io_base + pos, size); + ret = copy_to_user(ubuf, buf, size); + if (ret == size) { + ret = -EFAULT; + goto err_free; + } + + size -= ret; + *offp = pos + size; + ret = size; + +err_free: + kfree(buf); + + return ret; +} + +static ssize_t tool_peer_mw_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_mw *outmw = filep->private_data; + ssize_t ret; + loff_t pos = *offp; + void *buf; + + if (outmw->io_base == NULL) + return -EIO; + + if (pos >= outmw->size || !size) + return 0; + if (size > outmw->size - pos) + size = outmw->size - pos; + + buf = kmalloc(size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = copy_from_user(buf, ubuf, size); + if (ret == size) { + ret = -EFAULT; + goto err_free; + } + + size -= ret; + *offp = pos + size; + ret = size; + + memcpy_toio(outmw->io_base + pos, buf, size); + +err_free: + kfree(buf); + + return ret; +} + +static TOOL_FOPS_RDWR(tool_peer_mw_fops, + tool_peer_mw_read, + tool_peer_mw_write); + +static int tool_setup_peer_mw(struct tool_ctx *tc, int pidx, int widx, + u64 req_addr, size_t req_size) +{ + struct tool_mw *outmw = &tc->outmws[widx]; + resource_size_t map_size; + phys_addr_t map_base; + char buf[TOOL_BUF_LEN]; + int ret; + + if (outmw->io_base != NULL) + return 0; + + ret = ntb_peer_mw_get_addr(tc->ntb, widx, &map_base, &map_size); + if (ret) + return ret; + + ret = ntb_peer_mw_set_trans(tc->ntb, pidx, widx, req_addr, req_size); + if (ret) + return ret; + + outmw->io_base = ioremap_wc(map_base, map_size); + if (outmw->io_base == NULL) { + ret = -EFAULT; + goto err_clear_trans; + } + + outmw->tr_base = req_addr; + outmw->size = req_size; + outmw->pidx = pidx; + + snprintf(buf, sizeof(buf), "peer_mw%d", widx); + outmw->dbgfs_file = debugfs_create_file(buf, 0600, + tc->peers[pidx].dbgfs_dir, outmw, + &tool_peer_mw_fops); + + return 0; + +err_clear_trans: + ntb_peer_mw_clear_trans(tc->ntb, pidx, widx); + + return ret; +} + +static void tool_free_peer_mw(struct tool_ctx *tc, int widx) +{ + struct tool_mw *outmw = &tc->outmws[widx]; + + debugfs_remove(outmw->dbgfs_file); + + if (outmw->io_base != NULL) { + iounmap(tc->outmws[widx].io_base); + ntb_peer_mw_clear_trans(tc->ntb, outmw->pidx, widx); + } + + outmw->io_base = NULL; + outmw->tr_base = 0; + outmw->size = 0; + outmw->pidx = -1; + outmw->dbgfs_file = NULL; +} + +static ssize_t tool_peer_mw_trans_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_mw_wrap *outmw_wrap = filep->private_data; + struct tool_mw *outmw = outmw_wrap->mw; + resource_size_t map_size; + phys_addr_t map_base; + ssize_t off = 0; + size_t buf_size; + char *buf; + int ret; + + ret = ntb_peer_mw_get_addr(outmw->tc->ntb, outmw->widx, + &map_base, &map_size); + if (ret) + return ret; + + buf_size = min_t(size_t, size, 512); + + buf = kmalloc(buf_size, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + off += scnprintf(buf + off, buf_size - off, + "Outbound MW: \t%d\n", outmw->widx); + + if (outmw->io_base != NULL) { + off += scnprintf(buf + off, buf_size - off, + "Port attached \t%d (%d)\n", + ntb_peer_port_number(outmw->tc->ntb, outmw->pidx), + outmw->pidx); + } else { + off += scnprintf(buf + off, buf_size - off, + "Port attached \t-1 (-1)\n"); + } + + off += scnprintf(buf + off, buf_size - off, + "Virtual address \t0x%pK\n", outmw->io_base); + + off += scnprintf(buf + off, buf_size - off, + "Phys Address \t%pap\n", &map_base); + + off += scnprintf(buf + off, buf_size - off, + "Mapping Size \t%pap\n", &map_size); + + off += scnprintf(buf + off, buf_size - off, + "Translation Address \t0x%016llx\n", outmw->tr_base); + + off += scnprintf(buf + off, buf_size - off, + "Window Size \t%pap\n", &outmw->size); + + ret = simple_read_from_buffer(ubuf, size, offp, buf, off); + kfree(buf); + + return ret; +} + +static ssize_t tool_peer_mw_trans_write(struct file *filep, + const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_mw_wrap *outmw_wrap = filep->private_data; + struct tool_mw *outmw = outmw_wrap->mw; + size_t buf_size, wsize; + char buf[TOOL_BUF_LEN]; + int ret, n; + u64 addr; + + buf_size = min(size, (sizeof(buf) - 1)); + if (copy_from_user(buf, ubuf, buf_size)) + return -EFAULT; + + buf[buf_size] = '\0'; + + n = sscanf(buf, "%lli:%zi", &addr, &wsize); + if (n != 2) + return -EINVAL; + + tool_free_peer_mw(outmw->tc, outmw->widx); + if (wsize) { + ret = tool_setup_peer_mw(outmw->tc, outmw_wrap->pidx, + outmw->widx, addr, wsize); + if (ret) + return ret; + } + + return size; +} + +static TOOL_FOPS_RDWR(tool_peer_mw_trans_fops, + tool_peer_mw_trans_read, + tool_peer_mw_trans_write); + +static int tool_init_mws(struct tool_ctx *tc) +{ + int widx, pidx; + + /* Initialize outbound memory windows */ + tc->outmw_cnt = ntb_peer_mw_count(tc->ntb); + tc->outmws = devm_kcalloc(&tc->ntb->dev, tc->outmw_cnt, + sizeof(*tc->outmws), GFP_KERNEL); + if (tc->outmws == NULL) + return -ENOMEM; + + for (widx = 0; widx < tc->outmw_cnt; widx++) { + tc->outmws[widx].widx = widx; + tc->outmws[widx].pidx = -1; + tc->outmws[widx].tc = tc; + } + + /* Initialize inbound memory windows and outbound MWs wrapper */ + for (pidx = 0; pidx < tc->peer_cnt; pidx++) { + tc->peers[pidx].inmw_cnt = ntb_mw_count(tc->ntb, pidx); + tc->peers[pidx].inmws = + devm_kcalloc(&tc->ntb->dev, tc->peers[pidx].inmw_cnt, + sizeof(*tc->peers[pidx].inmws), GFP_KERNEL); + if (tc->peers[pidx].inmws == NULL) + return -ENOMEM; + + for (widx = 0; widx < tc->peers[pidx].inmw_cnt; widx++) { + tc->peers[pidx].inmws[widx].widx = widx; + tc->peers[pidx].inmws[widx].pidx = pidx; + tc->peers[pidx].inmws[widx].tc = tc; + } + + tc->peers[pidx].outmw_cnt = ntb_peer_mw_count(tc->ntb); + tc->peers[pidx].outmws = + devm_kcalloc(&tc->ntb->dev, tc->peers[pidx].outmw_cnt, + sizeof(*tc->peers[pidx].outmws), GFP_KERNEL); + if (tc->peers[pidx].outmws == NULL) + return -ENOMEM; + + for (widx = 0; widx < tc->peers[pidx].outmw_cnt; widx++) { + tc->peers[pidx].outmws[widx].pidx = pidx; + tc->peers[pidx].outmws[widx].mw = &tc->outmws[widx]; + } + } + + return 0; +} + +static void tool_clear_mws(struct tool_ctx *tc) +{ + int widx, pidx; + + /* Free outbound memory windows */ + for (widx = 0; widx < tc->outmw_cnt; widx++) + tool_free_peer_mw(tc, widx); + + /* Free outbound memory windows */ + for (pidx = 0; pidx < tc->peer_cnt; pidx++) + for (widx = 0; widx < tc->peers[pidx].inmw_cnt; widx++) + tool_free_mw(tc, pidx, widx); +} + +/*============================================================================== + * Doorbell read/write methods + *============================================================================== + */ + +static ssize_t tool_db_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_read(tc, ubuf, size, offp, tc->ntb->ops->db_read); +} + +static ssize_t tool_db_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_write(tc, ubuf, size, offp, tc->ntb->ops->db_set, + tc->ntb->ops->db_clear); +} + +static TOOL_FOPS_RDWR(tool_db_fops, + tool_db_read, + tool_db_write); + +static ssize_t tool_db_valid_mask_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_read(tc, ubuf, size, offp, tc->ntb->ops->db_valid_mask); +} + +static TOOL_FOPS_RDWR(tool_db_valid_mask_fops, + tool_db_valid_mask_read, + NULL); + +static ssize_t tool_db_mask_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_read(tc, ubuf, size, offp, tc->ntb->ops->db_read_mask); +} + +static ssize_t tool_db_mask_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_write(tc, ubuf, size, offp, tc->ntb->ops->db_set_mask, + tc->ntb->ops->db_clear_mask); +} + +static TOOL_FOPS_RDWR(tool_db_mask_fops, + tool_db_mask_read, + tool_db_mask_write); + +static ssize_t tool_peer_db_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_read(tc, ubuf, size, offp, tc->ntb->ops->peer_db_read); +} + +static ssize_t tool_peer_db_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_write(tc, ubuf, size, offp, tc->ntb->ops->peer_db_set, + tc->ntb->ops->peer_db_clear); +} + +static TOOL_FOPS_RDWR(tool_peer_db_fops, + tool_peer_db_read, + tool_peer_db_write); + +static ssize_t tool_peer_db_mask_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_read(tc, ubuf, size, offp, + tc->ntb->ops->peer_db_read_mask); +} + +static ssize_t tool_peer_db_mask_write(struct file *filep, + const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_write(tc, ubuf, size, offp, + tc->ntb->ops->peer_db_set_mask, + tc->ntb->ops->peer_db_clear_mask); +} + +static TOOL_FOPS_RDWR(tool_peer_db_mask_fops, + tool_peer_db_mask_read, + tool_peer_db_mask_write); + +static ssize_t tool_db_event_write(struct file *filep, + const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + u64 val; + int ret; + + ret = kstrtou64_from_user(ubuf, size, 0, &val); + if (ret) + return ret; + + if (wait_event_interruptible(tc->db_wq, ntb_db_read(tc->ntb) == val)) + return -ERESTART; + + return size; +} + +static TOOL_FOPS_RDWR(tool_db_event_fops, + NULL, + tool_db_event_write); + +/*============================================================================== + * Scratchpads read/write methods + *============================================================================== + */ + +static ssize_t tool_spad_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_spad *spad = filep->private_data; + char buf[TOOL_BUF_LEN]; + ssize_t pos; + + if (!spad->tc->ntb->ops->spad_read) + return -EINVAL; + + pos = scnprintf(buf, sizeof(buf), "%#x\n", + ntb_spad_read(spad->tc->ntb, spad->sidx)); + + return simple_read_from_buffer(ubuf, size, offp, buf, pos); +} + +static ssize_t tool_spad_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_spad *spad = filep->private_data; + u32 val; + int ret; + + if (!spad->tc->ntb->ops->spad_write) { + dev_dbg(&spad->tc->ntb->dev, "no spad write fn\n"); + return -EINVAL; + } + + ret = kstrtou32_from_user(ubuf, size, 0, &val); + if (ret) + return ret; + + ret = ntb_spad_write(spad->tc->ntb, spad->sidx, val); + + return ret ?: size; +} + +static TOOL_FOPS_RDWR(tool_spad_fops, + tool_spad_read, + tool_spad_write); + +static ssize_t tool_peer_spad_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_spad *spad = filep->private_data; + char buf[TOOL_BUF_LEN]; + ssize_t pos; + + if (!spad->tc->ntb->ops->peer_spad_read) + return -EINVAL; + + pos = scnprintf(buf, sizeof(buf), "%#x\n", + ntb_peer_spad_read(spad->tc->ntb, spad->pidx, spad->sidx)); + + return simple_read_from_buffer(ubuf, size, offp, buf, pos); +} + +static ssize_t tool_peer_spad_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_spad *spad = filep->private_data; + u32 val; + int ret; + + if (!spad->tc->ntb->ops->peer_spad_write) { + dev_dbg(&spad->tc->ntb->dev, "no spad write fn\n"); + return -EINVAL; + } + + ret = kstrtou32_from_user(ubuf, size, 0, &val); + if (ret) + return ret; + + ret = ntb_peer_spad_write(spad->tc->ntb, spad->pidx, spad->sidx, val); + + return ret ?: size; +} + +static TOOL_FOPS_RDWR(tool_peer_spad_fops, + tool_peer_spad_read, + tool_peer_spad_write); + +static int tool_init_spads(struct tool_ctx *tc) +{ + int sidx, pidx; + + /* Initialize inbound scratchpad structures */ + tc->inspad_cnt = ntb_spad_count(tc->ntb); + tc->inspads = devm_kcalloc(&tc->ntb->dev, tc->inspad_cnt, + sizeof(*tc->inspads), GFP_KERNEL); + if (tc->inspads == NULL) + return -ENOMEM; + + for (sidx = 0; sidx < tc->inspad_cnt; sidx++) { + tc->inspads[sidx].sidx = sidx; + tc->inspads[sidx].pidx = -1; + tc->inspads[sidx].tc = tc; + } + + /* Initialize outbound scratchpad structures */ + for (pidx = 0; pidx < tc->peer_cnt; pidx++) { + tc->peers[pidx].outspad_cnt = ntb_spad_count(tc->ntb); + tc->peers[pidx].outspads = + devm_kcalloc(&tc->ntb->dev, tc->peers[pidx].outspad_cnt, + sizeof(*tc->peers[pidx].outspads), GFP_KERNEL); + if (tc->peers[pidx].outspads == NULL) + return -ENOMEM; + + for (sidx = 0; sidx < tc->peers[pidx].outspad_cnt; sidx++) { + tc->peers[pidx].outspads[sidx].sidx = sidx; + tc->peers[pidx].outspads[sidx].pidx = pidx; + tc->peers[pidx].outspads[sidx].tc = tc; + } + } + + return 0; +} + +/*============================================================================== + * Messages read/write methods + *============================================================================== + */ + +static ssize_t tool_inmsg_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_msg *msg = filep->private_data; + char buf[TOOL_BUF_LEN]; + ssize_t pos; + u32 data; + int pidx; + + data = ntb_msg_read(msg->tc->ntb, &pidx, msg->midx); + + pos = scnprintf(buf, sizeof(buf), "0x%08x<-%d\n", data, pidx); + + return simple_read_from_buffer(ubuf, size, offp, buf, pos); +} + +static TOOL_FOPS_RDWR(tool_inmsg_fops, + tool_inmsg_read, + NULL); + +static ssize_t tool_outmsg_write(struct file *filep, + const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_msg *msg = filep->private_data; + u32 val; + int ret; + + ret = kstrtou32_from_user(ubuf, size, 0, &val); + if (ret) + return ret; + + ret = ntb_peer_msg_write(msg->tc->ntb, msg->pidx, msg->midx, val); + + return ret ? : size; +} + +static TOOL_FOPS_RDWR(tool_outmsg_fops, + NULL, + tool_outmsg_write); + +static ssize_t tool_msg_sts_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_read(tc, ubuf, size, offp, tc->ntb->ops->msg_read_sts); +} + +static ssize_t tool_msg_sts_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_write(tc, ubuf, size, offp, NULL, + tc->ntb->ops->msg_clear_sts); +} + +static TOOL_FOPS_RDWR(tool_msg_sts_fops, + tool_msg_sts_read, + tool_msg_sts_write); + +static ssize_t tool_msg_inbits_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_read(tc, ubuf, size, offp, tc->ntb->ops->msg_inbits); +} + +static TOOL_FOPS_RDWR(tool_msg_inbits_fops, + tool_msg_inbits_read, + NULL); + +static ssize_t tool_msg_outbits_read(struct file *filep, char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_read(tc, ubuf, size, offp, tc->ntb->ops->msg_outbits); +} + +static TOOL_FOPS_RDWR(tool_msg_outbits_fops, + tool_msg_outbits_read, + NULL); + +static ssize_t tool_msg_mask_write(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + + return tool_fn_write(tc, ubuf, size, offp, + tc->ntb->ops->msg_set_mask, + tc->ntb->ops->msg_clear_mask); +} + +static TOOL_FOPS_RDWR(tool_msg_mask_fops, + NULL, + tool_msg_mask_write); + +static ssize_t tool_msg_event_write(struct file *filep, + const char __user *ubuf, + size_t size, loff_t *offp) +{ + struct tool_ctx *tc = filep->private_data; + u64 val; + int ret; + + ret = kstrtou64_from_user(ubuf, size, 0, &val); + if (ret) + return ret; + + if (wait_event_interruptible(tc->msg_wq, + ntb_msg_read_sts(tc->ntb) == val)) + return -ERESTART; + + return size; +} + +static TOOL_FOPS_RDWR(tool_msg_event_fops, + NULL, + tool_msg_event_write); + +static int tool_init_msgs(struct tool_ctx *tc) +{ + int midx, pidx; + + /* Initialize inbound message structures */ + tc->inmsg_cnt = ntb_msg_count(tc->ntb); + tc->inmsgs = devm_kcalloc(&tc->ntb->dev, tc->inmsg_cnt, + sizeof(*tc->inmsgs), GFP_KERNEL); + if (tc->inmsgs == NULL) + return -ENOMEM; + + for (midx = 0; midx < tc->inmsg_cnt; midx++) { + tc->inmsgs[midx].midx = midx; + tc->inmsgs[midx].pidx = -1; + tc->inmsgs[midx].tc = tc; + } + + /* Initialize outbound message structures */ + for (pidx = 0; pidx < tc->peer_cnt; pidx++) { + tc->peers[pidx].outmsg_cnt = ntb_msg_count(tc->ntb); + tc->peers[pidx].outmsgs = + devm_kcalloc(&tc->ntb->dev, tc->peers[pidx].outmsg_cnt, + sizeof(*tc->peers[pidx].outmsgs), GFP_KERNEL); + if (tc->peers[pidx].outmsgs == NULL) + return -ENOMEM; + + for (midx = 0; midx < tc->peers[pidx].outmsg_cnt; midx++) { + tc->peers[pidx].outmsgs[midx].midx = midx; + tc->peers[pidx].outmsgs[midx].pidx = pidx; + tc->peers[pidx].outmsgs[midx].tc = tc; + } + } + + return 0; +} + +/*============================================================================== + * Initialization methods + *============================================================================== + */ + +static struct tool_ctx *tool_create_data(struct ntb_dev *ntb) +{ + struct tool_ctx *tc; + + tc = devm_kzalloc(&ntb->dev, sizeof(*tc), GFP_KERNEL); + if (tc == NULL) + return ERR_PTR(-ENOMEM); + + tc->ntb = ntb; + init_waitqueue_head(&tc->link_wq); + init_waitqueue_head(&tc->db_wq); + init_waitqueue_head(&tc->msg_wq); + + if (ntb_db_is_unsafe(ntb)) + dev_dbg(&ntb->dev, "doorbell is unsafe\n"); + + if (ntb_spad_is_unsafe(ntb)) + dev_dbg(&ntb->dev, "scratchpad is unsafe\n"); + + return tc; +} + +static void tool_clear_data(struct tool_ctx *tc) +{ + wake_up(&tc->link_wq); + wake_up(&tc->db_wq); + wake_up(&tc->msg_wq); +} + +static int tool_init_ntb(struct tool_ctx *tc) +{ + return ntb_set_ctx(tc->ntb, tc, &tool_ops); +} + +static void tool_clear_ntb(struct tool_ctx *tc) +{ + ntb_clear_ctx(tc->ntb); + ntb_link_disable(tc->ntb); +} + +static void tool_setup_dbgfs(struct tool_ctx *tc) +{ + int pidx, widx, sidx, midx; + char buf[TOOL_BUF_LEN]; + + /* This modules is useless without dbgfs... */ + if (!tool_dbgfs_topdir) { + tc->dbgfs_dir = NULL; + return; + } + + tc->dbgfs_dir = debugfs_create_dir(dev_name(&tc->ntb->dev), + tool_dbgfs_topdir); + if (!tc->dbgfs_dir) + return; + + debugfs_create_file("port", 0600, tc->dbgfs_dir, + tc, &tool_port_fops); + + debugfs_create_file("link", 0600, tc->dbgfs_dir, + tc, &tool_link_fops); + + debugfs_create_file("db", 0600, tc->dbgfs_dir, + tc, &tool_db_fops); + + debugfs_create_file("db_valid_mask", 0600, tc->dbgfs_dir, + tc, &tool_db_valid_mask_fops); + + debugfs_create_file("db_mask", 0600, tc->dbgfs_dir, + tc, &tool_db_mask_fops); + + debugfs_create_file("db_event", 0600, tc->dbgfs_dir, + tc, &tool_db_event_fops); + + debugfs_create_file("peer_db", 0600, tc->dbgfs_dir, + tc, &tool_peer_db_fops); + + debugfs_create_file("peer_db_mask", 0600, tc->dbgfs_dir, + tc, &tool_peer_db_mask_fops); + + if (tc->inspad_cnt != 0) { + for (sidx = 0; sidx < tc->inspad_cnt; sidx++) { + snprintf(buf, sizeof(buf), "spad%d", sidx); + + debugfs_create_file(buf, 0600, tc->dbgfs_dir, + &tc->inspads[sidx], &tool_spad_fops); + } + } + + if (tc->inmsg_cnt != 0) { + for (midx = 0; midx < tc->inmsg_cnt; midx++) { + snprintf(buf, sizeof(buf), "msg%d", midx); + debugfs_create_file(buf, 0600, tc->dbgfs_dir, + &tc->inmsgs[midx], &tool_inmsg_fops); + } + + debugfs_create_file("msg_sts", 0600, tc->dbgfs_dir, + tc, &tool_msg_sts_fops); + + debugfs_create_file("msg_inbits", 0600, tc->dbgfs_dir, + tc, &tool_msg_inbits_fops); + + debugfs_create_file("msg_outbits", 0600, tc->dbgfs_dir, + tc, &tool_msg_outbits_fops); + + debugfs_create_file("msg_mask", 0600, tc->dbgfs_dir, + tc, &tool_msg_mask_fops); + + debugfs_create_file("msg_event", 0600, tc->dbgfs_dir, + tc, &tool_msg_event_fops); + } + + for (pidx = 0; pidx < tc->peer_cnt; pidx++) { + snprintf(buf, sizeof(buf), "peer%d", pidx); + tc->peers[pidx].dbgfs_dir = + debugfs_create_dir(buf, tc->dbgfs_dir); + + debugfs_create_file("port", 0600, + tc->peers[pidx].dbgfs_dir, + &tc->peers[pidx], &tool_peer_port_fops); + + debugfs_create_file("link", 0200, + tc->peers[pidx].dbgfs_dir, + &tc->peers[pidx], &tool_peer_link_fops); + + debugfs_create_file("link_event", 0200, + tc->peers[pidx].dbgfs_dir, + &tc->peers[pidx], &tool_peer_link_event_fops); + + for (widx = 0; widx < tc->peers[pidx].inmw_cnt; widx++) { + snprintf(buf, sizeof(buf), "mw_trans%d", widx); + debugfs_create_file(buf, 0600, + tc->peers[pidx].dbgfs_dir, + &tc->peers[pidx].inmws[widx], + &tool_mw_trans_fops); + } + + for (widx = 0; widx < tc->peers[pidx].outmw_cnt; widx++) { + snprintf(buf, sizeof(buf), "peer_mw_trans%d", widx); + debugfs_create_file(buf, 0600, + tc->peers[pidx].dbgfs_dir, + &tc->peers[pidx].outmws[widx], + &tool_peer_mw_trans_fops); + } + + for (sidx = 0; sidx < tc->peers[pidx].outspad_cnt; sidx++) { + snprintf(buf, sizeof(buf), "spad%d", sidx); + + debugfs_create_file(buf, 0600, + tc->peers[pidx].dbgfs_dir, + &tc->peers[pidx].outspads[sidx], + &tool_peer_spad_fops); + } + + for (midx = 0; midx < tc->peers[pidx].outmsg_cnt; midx++) { + snprintf(buf, sizeof(buf), "msg%d", midx); + debugfs_create_file(buf, 0600, + tc->peers[pidx].dbgfs_dir, + &tc->peers[pidx].outmsgs[midx], + &tool_outmsg_fops); + } + } +} + +static void tool_clear_dbgfs(struct tool_ctx *tc) +{ + debugfs_remove_recursive(tc->dbgfs_dir); +} + +static int tool_probe(struct ntb_client *self, struct ntb_dev *ntb) +{ + struct tool_ctx *tc; + int ret; + + tc = tool_create_data(ntb); + if (IS_ERR(tc)) + return PTR_ERR(tc); + + ret = tool_init_peers(tc); + if (ret != 0) + goto err_clear_data; + + ret = tool_init_mws(tc); + if (ret != 0) + goto err_clear_data; + + ret = tool_init_spads(tc); + if (ret != 0) + goto err_clear_mws; + + ret = tool_init_msgs(tc); + if (ret != 0) + goto err_clear_mws; + + ret = tool_init_ntb(tc); + if (ret != 0) + goto err_clear_mws; + + tool_setup_dbgfs(tc); + + return 0; + +err_clear_mws: + tool_clear_mws(tc); + +err_clear_data: + tool_clear_data(tc); + + return ret; +} + +static void tool_remove(struct ntb_client *self, struct ntb_dev *ntb) +{ + struct tool_ctx *tc = ntb->ctx; + + tool_clear_dbgfs(tc); + + tool_clear_ntb(tc); + + tool_clear_mws(tc); + + tool_clear_data(tc); +} + +static struct ntb_client tool_client = { + .ops = { + .probe = tool_probe, + .remove = tool_remove, + } +}; + +static int __init tool_init(void) +{ + int ret; + + if (debugfs_initialized()) + tool_dbgfs_topdir = debugfs_create_dir(KBUILD_MODNAME, NULL); + + ret = ntb_register_client(&tool_client); + if (ret) + debugfs_remove_recursive(tool_dbgfs_topdir); + + return ret; +} +module_init(tool_init); + +static void __exit tool_exit(void) +{ + ntb_unregister_client(&tool_client); + debugfs_remove_recursive(tool_dbgfs_topdir); +} +module_exit(tool_exit); 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