diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ntb/test/ntb_perf.c | 1820 |
1 files changed, 1219 insertions, 601 deletions
diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c index 6f6c602d04af..8de72f3fba4d 100644 --- a/drivers/ntb/test/ntb_perf.c +++ b/drivers/ntb/test/ntb_perf.c @@ -5,6 +5,7 @@ * 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 @@ -13,6 +14,7 @@ * 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 @@ -40,859 +42,1475 @@ * (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 + * 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/kthread.h> -#include <linux/time.h> -#include <linux/timer.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/spinlock.h> -#include <linux/debugfs.h> -#include <linux/dmaengine.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> -#include <linux/mutex.h> #define DRIVER_NAME "ntb_perf" -#define DRIVER_DESCRIPTION "PCIe NTB Performance Measurement Tool" - -#define DRIVER_VERSION "1.0" -#define DRIVER_AUTHOR "Dave Jiang <dave.jiang@intel.com>" - -#define PERF_LINK_DOWN_TIMEOUT 10 -#define PERF_VERSION 0xffff0001 -#define MAX_THREADS 32 -#define MAX_TEST_SIZE SZ_1M -#define MAX_SRCS 32 -#define DMA_OUT_RESOURCE_TO msecs_to_jiffies(50) -#define DMA_RETRIES 20 -#define SZ_4G (1ULL << 32) -#define MAX_SEG_ORDER 20 /* no larger than 1M for kmalloc buffer */ -#define PIDX NTB_DEF_PEER_IDX +#define DRIVER_VERSION "2.0" MODULE_LICENSE("Dual BSD/GPL"); MODULE_VERSION(DRIVER_VERSION); -MODULE_AUTHOR(DRIVER_AUTHOR); -MODULE_DESCRIPTION(DRIVER_DESCRIPTION); +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 -static struct dentry *perf_debugfs_dir; +#define MSG_TRIES 500 +#define MSG_UDELAY_LOW 1000 +#define MSG_UDELAY_HIGH 2000 + +#define PERF_BUF_LEN 1024 static unsigned long max_mw_size; module_param(max_mw_size, ulong, 0644); -MODULE_PARM_DESC(max_mw_size, "Limit size of large memory windows"); +MODULE_PARM_DESC(max_mw_size, "Upper limit of memory window size"); -static unsigned int seg_order = 19; /* 512K */ -module_param(seg_order, uint, 0644); -MODULE_PARM_DESC(seg_order, "size order [2^n] of buffer segment for testing"); +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 int run_order = 32; /* 4G */ -module_param(run_order, uint, 0644); -MODULE_PARM_DESC(run_order, "size order [2^n] of total data 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, "Using DMA engine to measure performance"); - -static bool on_node = true; /* default to 1 */ -module_param(on_node, bool, 0644); -MODULE_PARM_DESC(on_node, "Run threads only on NTB device node (default: true)"); - -struct perf_mw { - phys_addr_t phys_addr; - resource_size_t phys_size; - void __iomem *vbase; - size_t xlat_size; - size_t buf_size; - void *virt_addr; - dma_addr_t dma_addr; +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 pthr_ctx { - struct task_struct *thread; - struct perf_ctx *perf; - atomic_t dma_sync; - struct dma_chan *dma_chan; - int dma_prep_err; - int src_idx; - void *srcs[MAX_SRCS]; - wait_queue_head_t *wq; - int status; - u64 copied; - u64 diff_us; +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; + + /* 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; }; +#define to_peer_service(__work) \ + container_of(__work, struct perf_peer, service) -struct perf_ctx { - struct ntb_dev *ntb; - spinlock_t db_lock; - struct perf_mw mw; - bool link_is_up; - struct delayed_work link_work; - wait_queue_head_t link_wq; - u8 perf_threads; - /* mutex ensures only one set of threads run at once */ - struct mutex run_mutex; - struct pthr_ctx pthr_ctx[MAX_THREADS]; - atomic_t tsync; - atomic_t tdone; +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) -enum { - VERSION = 0, - MW_SZ_HIGH, - MW_SZ_LOW, - MAX_SPAD +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 (le32_to_cpu(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), + cpu_to_le32(lower_32_bits(data))); + ntb_peer_spad_write(perf->ntb, peer->pidx, + PERF_SPAD_HDATA(perf->gidx), + cpu_to_le32(upper_32_bits(data))); + mmiowb(); + ntb_peer_spad_write(perf->ntb, peer->pidx, + PERF_SPAD_CMD(perf->gidx), + cpu_to_le32(cmd)); + mmiowb(); + 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)); + val = le32_to_cpu(val); + if (val == PERF_CMD_INVAL) + continue; + + *cmd = val; + + val = ntb_spad_read(perf->ntb, PERF_SPAD_LDATA(peer->gidx)); + *data = le32_to_cpu(val); + + val = ntb_spad_read(perf->ntb, PERF_SPAD_HDATA(peer->gidx)); + *data |= (u64)le32_to_cpu(val) << 32; + + /* Next command can be retrieved from now */ + ntb_spad_write(perf->ntb, PERF_SPAD_CMD(peer->gidx), + cpu_to_le32(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, + cpu_to_le32(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, + cpu_to_le32(upper_32_bits(data))); + mmiowb(); + + /* This call shall trigger peer message event */ + ntb_peer_msg_write(perf->ntb, peer->pidx, PERF_MSG_CMD, + cpu_to_le32(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 = le32_to_cpu(val); + + val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_LDATA); + *data = le32_to_cpu(val); + + val = ntb_msg_read(perf->ntb, pidx, PERF_MSG_HDATA); + *data |= (u64)le32_to_cpu(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; - if (ntb_link_is_up(perf->ntb, NULL, NULL) == 1) { - schedule_delayed_work(&perf->link_work, 2*HZ); - } else { - dev_dbg(&perf->ntb->pdev->dev, "link down\n"); + for (pidx = 0; pidx < perf->pcnt; pidx++) { + peer = &perf->peers[pidx]; - if (!perf->link_is_up) - cancel_delayed_work_sync(&perf->link_work); + lnk_up = perf_link_is_up(peer); - perf->link_is_up = false; + 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; - u64 db_bits, db_mask; - db_mask = ntb_db_vector_mask(perf->ntb, vec); - db_bits = ntb_db_read(perf->ntb); + 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)); - dev_dbg(&perf->ntb->dev, "doorbell vec %d mask %#llx bits %#llx\n", - vec, db_mask, db_bits); + /* 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_copy_callback(void *data) +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 pthr_ctx *pctx = data; + 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); - atomic_dec(&pctx->dma_sync); + return 0; } -static ssize_t perf_copy(struct pthr_ctx *pctx, char __iomem *dst, - char *src, size_t size) +static void perf_free_inbuf(struct perf_peer *peer) { - struct perf_ctx *perf = pctx->perf; - struct dma_async_tx_descriptor *txd; - struct dma_chan *chan = pctx->dma_chan; - struct dma_device *device; - struct dmaengine_unmap_data *unmap; - dma_cookie_t cookie; - size_t src_off, dst_off; - struct perf_mw *mw = &perf->mw; - void __iomem *vbase; - void __iomem *dst_vaddr; - dma_addr_t dst_phys; - int retries = 0; + if (!peer->inbuf) + return; - if (!use_dma) { - memcpy_toio(dst, src, size); - return size; + (void)ntb_mw_clear_trans(peer->perf->ntb, peer->pidx, peer->gidx); + dma_free_coherent(&peer->perf->ntb->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 (!chan) { - dev_err(&perf->ntb->dev, "DMA engine does not exist\n"); + 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; } - device = chan->device; - src_off = (uintptr_t)src & ~PAGE_MASK; - dst_off = (uintptr_t __force)dst & ~PAGE_MASK; + peer->inbuf_size = round_up(peer->inbuf_size, size_align); - if (!is_dma_copy_aligned(device, src_off, dst_off, size)) - return -ENODEV; - - vbase = mw->vbase; - dst_vaddr = dst; - dst_phys = mw->phys_addr + (dst_vaddr - vbase); + perf_free_inbuf(peer); - unmap = dmaengine_get_unmap_data(device->dev, 1, GFP_NOWAIT); - if (!unmap) + peer->inbuf = dma_alloc_coherent(&perf->ntb->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)) { + dev_err(&perf->ntb->dev, "Unaligned inbuf allocated\n"); + goto err_free_inbuf; + } - unmap->len = size; - unmap->addr[0] = dma_map_page(device->dev, virt_to_page(src), - src_off, size, DMA_TO_DEVICE); - if (dma_mapping_error(device->dev, unmap->addr[0])) - goto err_get_unmap; + 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; + } - unmap->to_cnt = 1; + /* + * 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); - do { - txd = device->device_prep_dma_memcpy(chan, dst_phys, - unmap->addr[0], - size, DMA_PREP_INTERRUPT); - if (!txd) { - set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(DMA_OUT_RESOURCE_TO); - } - } while (!txd && (++retries < DMA_RETRIES)); + return 0; - if (!txd) { - pctx->dma_prep_err++; - goto err_get_unmap; - } +err_free_inbuf: + perf_free_inbuf(peer); - txd->callback = perf_copy_callback; - txd->callback_param = pctx; - dma_set_unmap(txd, unmap); + return ret; +} - cookie = dmaengine_submit(txd); - if (dma_submit_error(cookie)) - goto err_set_unmap; +static void perf_service_work(struct work_struct *work) +{ + struct perf_peer *peer = to_peer_service(work); - dmaengine_unmap_put(unmap); + if (test_and_clear_bit(PERF_CMD_SSIZE, &peer->sts)) + perf_cmd_send(peer, PERF_CMD_SSIZE, peer->outbuf_size); - atomic_inc(&pctx->dma_sync); - dma_async_issue_pending(chan); + if (test_and_clear_bit(PERF_CMD_RSIZE, &peer->sts)) + perf_setup_inbuf(peer); - return size; + if (test_and_clear_bit(PERF_CMD_SXLAT, &peer->sts)) + perf_cmd_send(peer, PERF_CMD_SXLAT, peer->inbuf_xlat); -err_set_unmap: - dmaengine_unmap_put(unmap); -err_get_unmap: - dmaengine_unmap_put(unmap); - return 0; -} + if (test_and_clear_bit(PERF_CMD_RXLAT, &peer->sts)) + perf_setup_outbuf(peer); -static int perf_move_data(struct pthr_ctx *pctx, char __iomem *dst, char *src, - u64 buf_size, u64 win_size, u64 total) -{ - int chunks, total_chunks, i; - int copied_chunks = 0; - u64 copied = 0, result; - char __iomem *tmp = dst; - u64 perf, diff_us; - ktime_t kstart, kstop, kdiff; - unsigned long last_sleep = jiffies; - - chunks = div64_u64(win_size, buf_size); - total_chunks = div64_u64(total, buf_size); - kstart = ktime_get(); - - for (i = 0; i < total_chunks; i++) { - result = perf_copy(pctx, tmp, src, buf_size); - copied += result; - copied_chunks++; - if (copied_chunks == chunks) { - tmp = dst; - copied_chunks = 0; - } else - tmp += buf_size; - - /* Probably should schedule every 5s to prevent soft hang. */ - if (unlikely((jiffies - last_sleep) > 5 * HZ)) { - last_sleep = jiffies; - set_current_state(TASK_INTERRUPTIBLE); - schedule_timeout(1); + if (test_and_clear_bit(PERF_CMD_CLEAR, &peer->sts)) { + 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); + } +} - if (unlikely(kthread_should_stop())) - break; +static int perf_init_service(struct perf_ctx *perf) +{ + u64 mask; + + if (ntb_peer_mw_count(perf->ntb) < perf->pcnt + 1) { + dev_err(&perf->ntb->dev, "Not enough memory windows\n"); + return -EINVAL; } - if (use_dma) { - pr_debug("%s: All DMA descriptors submitted\n", current->comm); - while (atomic_read(&pctx->dma_sync) != 0) { - if (kthread_should_stop()) - break; - msleep(20); - } + 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; } - kstop = ktime_get(); - kdiff = ktime_sub(kstop, kstart); - diff_us = ktime_to_us(kdiff); + dev_dbg(&perf->ntb->dev, "Message service unsupported\n"); - pr_debug("%s: copied %llu bytes\n", current->comm, copied); + 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; - pr_debug("%s: lasted %llu usecs\n", current->comm, diff_us); + dev_dbg(&perf->ntb->dev, "Scratchpad service initialized\n"); - perf = div64_u64(copied, diff_us); + return 0; + } - pr_debug("%s: MBytes/s: %llu\n", current->comm, perf); + dev_dbg(&perf->ntb->dev, "Scratchpad service unsupported\n"); - pctx->copied = copied; - pctx->diff_us = diff_us; + dev_err(&perf->ntb->dev, "Command services unsupported\n"); - return 0; + return -EINVAL; } -static bool perf_dma_filter_fn(struct dma_chan *chan, void *node) +static int perf_enable_service(struct perf_ctx *perf) { - /* Is the channel required to be on the same node as the device? */ - if (!on_node) - return true; + u64 mask, incmd_bit; + int ret, sidx, scnt; - return dev_to_node(&chan->dev->device) == (int)(unsigned long)node; -} + mask = ntb_db_valid_mask(perf->ntb); + (void)ntb_db_set_mask(perf->ntb, mask); -static int ntb_perf_thread(void *data) -{ - struct pthr_ctx *pctx = data; - struct perf_ctx *perf = pctx->perf; - struct pci_dev *pdev = perf->ntb->pdev; - struct perf_mw *mw = &perf->mw; - char __iomem *dst; - u64 win_size, buf_size, total; - void *src; - int rc, node, i; - struct dma_chan *dma_chan = NULL; + ret = ntb_set_ctx(perf->ntb, perf, &perf_ops); + if (ret) + return ret; - pr_debug("kthread %s starting...\n", current->comm); + if (perf->cmd_send == perf_msg_cmd_send) { + u64 inbits, outbits; - node = on_node ? dev_to_node(&pdev->dev) : NUMA_NO_NODE; + inbits = ntb_msg_inbits(perf->ntb); + outbits = ntb_msg_outbits(perf->ntb); + (void)ntb_msg_set_mask(perf->ntb, inbits | outbits); - if (use_dma && !pctx->dma_chan) { - dma_cap_mask_t dma_mask; + incmd_bit = BIT_ULL(__ffs64(inbits)); + ret = ntb_msg_clear_mask(perf->ntb, incmd_bit); - dma_cap_zero(dma_mask); - dma_cap_set(DMA_MEMCPY, dma_mask); - dma_chan = dma_request_channel(dma_mask, perf_dma_filter_fn, - (void *)(unsigned long)node); - if (!dma_chan) { - pr_warn("%s: cannot acquire DMA channel, quitting\n", - current->comm); - return -ENODEV; - } - pctx->dma_chan = dma_chan; + 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; } - for (i = 0; i < MAX_SRCS; i++) { - pctx->srcs[i] = kmalloc_node(MAX_TEST_SIZE, GFP_KERNEL, node); - if (!pctx->srcs[i]) { - rc = -ENOMEM; - goto err; - } + 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; + + ntb_link_disable(perf->ntb); + + 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)); } - win_size = mw->phys_size; - buf_size = 1ULL << seg_order; - total = 1ULL << run_order; + ntb_clear_ctx(perf->ntb); - if (buf_size > MAX_TEST_SIZE) - buf_size = MAX_TEST_SIZE; + for (pidx = 0; pidx < perf->pcnt; pidx++) + perf_cmd_exec(&perf->peers[pidx], PERF_CMD_CLEAR); - dst = (char __iomem *)mw->vbase; + for (pidx = 0; pidx < perf->pcnt; pidx++) + flush_work(&perf->peers[pidx].service); +} - atomic_inc(&perf->tsync); - while (atomic_read(&perf->tsync) != perf->perf_threads) - schedule(); +/*============================================================================== + * Performance measuring work-thread + *============================================================================== + */ - src = pctx->srcs[pctx->src_idx]; - pctx->src_idx = (pctx->src_idx + 1) & (MAX_SRCS - 1); +static void perf_dma_copy_callback(void *data) +{ + struct perf_thread *pthr = data; - rc = perf_move_data(pctx, dst, src, buf_size, win_size, total); + atomic_dec(&pthr->dma_sync); + wake_up(&pthr->dma_wait); +} - atomic_dec(&perf->tsync); +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; - if (rc < 0) { - pr_err("%s: failed\n", current->comm); - rc = -ENXIO; - goto err; + if (!use_dma) { + memcpy_toio(dst, src, len); + goto ret_check_tsync; } - for (i = 0; i < MAX_SRCS; i++) { - kfree(pctx->srcs[i]); - pctx->srcs[i] = NULL; + 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; + + unmap = dmaengine_get_unmap_data(dma_dev, 2, 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; - atomic_inc(&perf->tdone); - wake_up(pctx->wq); - rc = 0; - goto done; + unmap->addr[1] = dma_map_page(dma_dev, virt_to_page(dst), + offset_in_page(dst), len, DMA_FROM_DEVICE); + if (dma_mapping_error(dma_dev, unmap->addr[1])) { + ret = -EIO; + goto err_free_resource; + } + unmap->from_cnt = 1; -err: - for (i = 0; i < MAX_SRCS; i++) { - kfree(pctx->srcs[i]); - pctx->srcs[i] = NULL; + do { + tx = dmaengine_prep_dma_memcpy(pthr->dma_chan, unmap->addr[1], + 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; } - if (dma_chan) { - dma_release_channel(dma_chan); - pctx->dma_chan = NULL; + tx->callback = perf_dma_copy_callback; + tx->callback_param = pthr; + dma_set_unmap(tx, unmap); + + if (dma_submit_error(dmaengine_submit(tx))) { + dmaengine_unmap_put(unmap); + goto err_free_resource; } -done: - /* Wait until we are told to stop */ - for (;;) { - set_current_state(TASK_INTERRUPTIBLE); - if (kthread_should_stop()) - break; - schedule(); + 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; + + 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); + atomic_dec(&perf->tsync); + wake_up(&perf->twait); + kfree(pthr->src); + return -ENODEV; } - __set_current_state(TASK_RUNNING); - return rc; + atomic_set(&pthr->dma_sync, 0); + + return 0; } -static void perf_free_mw(struct perf_ctx *perf) +static int perf_run_test(struct perf_thread *pthr) { - struct perf_mw *mw = &perf->mw; - struct pci_dev *pdev = perf->ntb->pdev; + 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; + } - if (!mw->virt_addr) - return; + 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; + } - ntb_mw_clear_trans(perf->ntb, PIDX, 0); - dma_free_coherent(&pdev->dev, mw->buf_size, - mw->virt_addr, mw->dma_addr); - mw->xlat_size = 0; - mw->buf_size = 0; - mw->virt_addr = NULL; + /* Give up CPU to give a chance for other threads to use it */ + schedule(); + } + + return 0; } -static int perf_set_mw(struct perf_ctx *perf, resource_size_t size) +static int perf_sync_test(struct perf_thread *pthr) { - struct perf_mw *mw = &perf->mw; - size_t xlat_size, buf_size; - resource_size_t xlat_align; - resource_size_t xlat_align_size; - int rc; + struct perf_ctx *perf = pthr->perf; - if (!size) - return -EINVAL; + if (!use_dma) + goto no_dma_ret; - rc = ntb_mw_get_align(perf->ntb, PIDX, 0, &xlat_align, - &xlat_align_size, NULL); - if (rc) - return rc; + wait_event(pthr->dma_wait, + (atomic_read(&pthr->dma_sync) == 0 || + atomic_read(&perf->tsync) < 0)); - xlat_size = round_up(size, xlat_align_size); - buf_size = round_up(size, xlat_align); + if (atomic_read(&perf->tsync) < 0) + return -EINTR; - if (mw->xlat_size == xlat_size) - return 0; +no_dma_ret: + pthr->duration = ktime_sub(ktime_get(), pthr->duration); - if (mw->buf_size) - perf_free_mw(perf); + dev_dbg(&perf->ntb->dev, "%d: copied %llu bytes\n", + pthr->tidx, pthr->copied); - mw->xlat_size = xlat_size; - mw->buf_size = buf_size; + 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); + + dma_release_channel(pthr->dma_chan); + +no_dma_notify: + atomic_dec(&perf->tsync); + wake_up(&perf->twait); + kfree(pthr->src); +} - mw->virt_addr = dma_alloc_coherent(&perf->ntb->pdev->dev, buf_size, - &mw->dma_addr, GFP_KERNEL); - if (!mw->virt_addr) { - mw->xlat_size = 0; - mw->buf_size = 0; +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; } - rc = ntb_mw_set_trans(perf->ntb, PIDX, 0, mw->dma_addr, mw->xlat_size); - if (rc) { - dev_err(&perf->ntb->dev, "Unable to set mw0 translation\n"); - perf_free_mw(perf); - return -EIO; + ret = perf_run_test(pthr); + if (ret) { + pthr->status = ret; + goto err_clear_test; } - return 0; + pthr->status = perf_sync_test(pthr); + +err_clear_test: + perf_clear_test(pthr); } -static void perf_link_work(struct work_struct *work) +static int perf_set_tcnt(struct perf_ctx *perf, u8 tcnt) { - struct perf_ctx *perf = - container_of(work, struct perf_ctx, link_work.work); - struct ntb_dev *ndev = perf->ntb; - struct pci_dev *pdev = ndev->pdev; - u32 val; - u64 size; - int rc; + if (tcnt == 0 || tcnt > MAX_THREADS_CNT) + return -EINVAL; - dev_dbg(&perf->ntb->pdev->dev, "%s called\n", __func__); + if (test_and_set_bit_lock(0, &perf->busy_flag)) + return -EBUSY; + + perf->tcnt = tcnt; + + clear_bit_unlock(0, &perf->busy_flag); - size = perf->mw.phys_size; + return 0; +} - if (max_mw_size && size > max_mw_size) - size = max_mw_size; +static void perf_terminate_test(struct perf_ctx *perf) +{ + int tidx; - ntb_peer_spad_write(ndev, PIDX, MW_SZ_HIGH, upper_32_bits(size)); - ntb_peer_spad_write(ndev, PIDX, MW_SZ_LOW, lower_32_bits(size)); - ntb_peer_spad_write(ndev, PIDX, VERSION, PERF_VERSION); + atomic_set(&perf->tsync, -1); + wake_up(&perf->twait); - /* now read what peer wrote */ - val = ntb_spad_read(ndev, VERSION); - if (val != PERF_VERSION) { - dev_dbg(&pdev->dev, "Remote version = %#x\n", val); - goto out; + 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; - val = ntb_spad_read(ndev, MW_SZ_HIGH); - size = (u64)val << 32; + if (!test_bit(PERF_STS_DONE, &peer->sts)) + return -ENOLINK; - val = ntb_spad_read(ndev, MW_SZ_LOW); - size |= val; + if (test_and_set_bit_lock(0, &perf->busy_flag)) + return -EBUSY; - dev_dbg(&pdev->dev, "Remote MW size = %#llx\n", size); + perf->test_peer = peer; + atomic_set(&perf->tsync, perf->tcnt); - rc = perf_set_mw(perf, size); - if (rc) - goto out1; + for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) { + pthr = &perf->threads[tidx]; - perf->link_is_up = true; - wake_up(&perf->link_wq); + pthr->status = -ENODATA; + pthr->copied = 0; + pthr->duration = ktime_set(0, 0); + if (tidx < perf->tcnt) + (void)queue_work(perf_wq, &pthr->work); + } - return; + ret = wait_event_interruptible(perf->twait, + atomic_read(&perf->tsync) <= 0); + if (ret == -ERESTARTSYS) { + perf_terminate_test(perf); + ret = -EINTR; + } -out1: - perf_free_mw(perf); + clear_bit_unlock(0, &perf->busy_flag); -out: - if (ntb_link_is_up(ndev, NULL, NULL) == 1) - schedule_delayed_work(&perf->link_work, - msecs_to_jiffies(PERF_LINK_DOWN_TIMEOUT)); + return ret; } -static int perf_setup_mw(struct ntb_dev *ntb, struct perf_ctx *perf) +static int perf_read_stats(struct perf_ctx *perf, char *buf, + size_t size, ssize_t *pos) { - struct perf_mw *mw; - int rc; + struct perf_thread *pthr; + int tidx; + + if (test_and_set_bit_lock(0, &perf->busy_flag)) + return -EBUSY; - mw = &perf->mw; + (*pos) += scnprintf(buf + *pos, size - *pos, + " Peer %d test statistics:\n", perf->test_peer->pidx); - rc = ntb_peer_mw_get_addr(ntb, 0, &mw->phys_addr, &mw->phys_size); - if (rc) - return rc; + for (tidx = 0; tidx < MAX_THREADS_CNT; tidx++) { + pthr = &perf->threads[tidx]; - perf->mw.vbase = ioremap_wc(mw->phys_addr, mw->phys_size); - if (!mw->vbase) - return -ENOMEM; + 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 ssize_t debugfs_run_read(struct file *filp, char __user *ubuf, - size_t count, loff_t *offp) +static void perf_init_threads(struct perf_ctx *perf) { - struct perf_ctx *perf = filp->private_data; + 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; - ssize_t ret, out_off = 0; - struct pthr_ctx *pctx; - int i; - u64 rate; - if (!perf) - return 0; + buf_size = min_t(size_t, size, 0x1000U); - buf = kmalloc(1024, GFP_KERNEL); + buf = kmalloc(buf_size, GFP_KERNEL); if (!buf) return -ENOMEM; - if (mutex_is_locked(&perf->run_mutex)) { - out_off = scnprintf(buf, 64, "running\n"); - goto read_from_buf; + 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 (i = 0; i < MAX_THREADS; i++) { - pctx = &perf->pthr_ctx[i]; + 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); - if (pctx->status == -ENODATA) - break; + pos += scnprintf(buf + pos, buf_size - pos, + "\tOut buffer size %pa\n", &peer->outbuf_size); - if (pctx->status) { - out_off += scnprintf(buf + out_off, 1024 - out_off, - "%d: error %d\n", i, - pctx->status); + 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; } - rate = div64_u64(pctx->copied, pctx->diff_us); - out_off += scnprintf(buf + out_off, 1024 - out_off, - "%d: copied %llu bytes in %llu usecs, %llu MBytes/s\n", - i, pctx->copied, pctx->diff_us, rate); + 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); } -read_from_buf: - ret = simple_read_from_buffer(ubuf, count, offp, buf, out_off); + ret = simple_read_from_buffer(ubuf, size, offp, buf, pos); kfree(buf); return ret; } -static void threads_cleanup(struct perf_ctx *perf) +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 pthr_ctx *pctx; - int i; + struct perf_ctx *perf = filep->private_data; + ssize_t ret, pos = 0; + char *buf; - for (i = 0; i < MAX_THREADS; i++) { - pctx = &perf->pthr_ctx[i]; - if (pctx->thread) { - pctx->status = kthread_stop(pctx->thread); - pctx->thread = NULL; - } - } -} + buf = kmalloc(PERF_BUF_LEN, GFP_KERNEL); + if (!buf) + return -ENOMEM; -static void perf_clear_thread_status(struct perf_ctx *perf) -{ - int i; + 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); - for (i = 0; i < MAX_THREADS; i++) - perf->pthr_ctx[i].status = -ENODATA; + return ret; } -static ssize_t debugfs_run_write(struct file *filp, const char __user *ubuf, - size_t count, loff_t *offp) +static ssize_t perf_dbgfs_write_run(struct file *filep, const char __user *ubuf, + size_t size, loff_t *offp) { - struct perf_ctx *perf = filp->private_data; - int node, i; - DECLARE_WAIT_QUEUE_HEAD(wq); + struct perf_ctx *perf = filep->private_data; + struct perf_peer *peer; + int pidx, ret; - if (wait_event_interruptible(perf->link_wq, perf->link_is_up)) - return -ENOLINK; + ret = kstrtoint_from_user(ubuf, size, 0, &pidx); + if (ret) + return ret; - if (perf->perf_threads == 0) + if (pidx < 0 || pidx >= perf->pcnt) return -EINVAL; - if (!mutex_trylock(&perf->run_mutex)) - return -EBUSY; + peer = &perf->peers[pidx]; - perf_clear_thread_status(perf); + ret = perf_submit_test(peer); + if (ret) + return ret; - if (perf->perf_threads > MAX_THREADS) { - perf->perf_threads = MAX_THREADS; - pr_info("Reset total threads to: %u\n", MAX_THREADS); - } + return size; +} - /* no greater than 1M */ - if (seg_order > MAX_SEG_ORDER) { - seg_order = MAX_SEG_ORDER; - pr_info("Fix seg_order to %u\n", seg_order); - } +static const struct file_operations perf_dbgfs_run = { + .open = simple_open, + .read = perf_dbgfs_read_run, + .write = perf_dbgfs_write_run +}; - if (run_order < seg_order) { - run_order = seg_order; - pr_info("Fix run_order to %u\n", run_order); - } +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; - node = on_node ? dev_to_node(&perf->ntb->pdev->dev) - : NUMA_NO_NODE; - atomic_set(&perf->tdone, 0); + pos = scnprintf(buf, sizeof(buf), "%hhu\n", perf->tcnt); - /* launch kernel thread */ - for (i = 0; i < perf->perf_threads; i++) { - struct pthr_ctx *pctx; + return simple_read_from_buffer(ubuf, size, offp, buf, pos); +} - pctx = &perf->pthr_ctx[i]; - atomic_set(&pctx->dma_sync, 0); - pctx->perf = perf; - pctx->wq = &wq; - pctx->thread = - kthread_create_on_node(ntb_perf_thread, - (void *)pctx, - node, "ntb_perf %d", i); - if (IS_ERR(pctx->thread)) { - pctx->thread = NULL; - goto err; - } else { - wake_up_process(pctx->thread); - } - } +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; - wait_event_interruptible(wq, - atomic_read(&perf->tdone) == perf->perf_threads); + ret = kstrtou8_from_user(ubuf, size, 0, &val); + if (ret) + return ret; - threads_cleanup(perf); - mutex_unlock(&perf->run_mutex); - return count; + ret = perf_set_tcnt(perf, val); + if (ret) + return ret; -err: - threads_cleanup(perf); - mutex_unlock(&perf->run_mutex); - return -ENXIO; + return size; } -static const struct file_operations ntb_perf_debugfs_run = { - .owner = THIS_MODULE, +static const struct file_operations perf_dbgfs_tcnt = { .open = simple_open, - .read = debugfs_run_read, - .write = debugfs_run_write, + .read = perf_dbgfs_read_tcnt, + .write = perf_dbgfs_write_tcnt }; -static int perf_debugfs_setup(struct perf_ctx *perf) +static void perf_setup_dbgfs(struct perf_ctx *perf) { struct pci_dev *pdev = perf->ntb->pdev; - struct dentry *debugfs_node_dir; - struct dentry *debugfs_run; - struct dentry *debugfs_threads; - struct dentry *debugfs_seg_order; - struct dentry *debugfs_run_order; - struct dentry *debugfs_use_dma; - struct dentry *debugfs_on_node; - - if (!debugfs_initialized()) - return -ENODEV; - /* Assumpion: only one NTB device in the system */ - if (!perf_debugfs_dir) { - perf_debugfs_dir = debugfs_create_dir(KBUILD_MODNAME, NULL); - if (!perf_debugfs_dir) - return -ENODEV; - } - - debugfs_node_dir = debugfs_create_dir(pci_name(pdev), - perf_debugfs_dir); - if (!debugfs_node_dir) - goto err; - - debugfs_run = debugfs_create_file("run", S_IRUSR | S_IWUSR, - debugfs_node_dir, perf, - &ntb_perf_debugfs_run); - if (!debugfs_run) - goto err; - - debugfs_threads = debugfs_create_u8("threads", S_IRUSR | S_IWUSR, - debugfs_node_dir, - &perf->perf_threads); - if (!debugfs_threads) - goto err; - - debugfs_seg_order = debugfs_create_u32("seg_order", 0600, - debugfs_node_dir, - &seg_order); - if (!debugfs_seg_order) - goto err; - - debugfs_run_order = debugfs_create_u32("run_order", 0600, - debugfs_node_dir, - &run_order); - if (!debugfs_run_order) - goto err; - - debugfs_use_dma = debugfs_create_bool("use_dma", 0600, - debugfs_node_dir, - &use_dma); - if (!debugfs_use_dma) - goto err; - - debugfs_on_node = debugfs_create_bool("on_node", 0600, - debugfs_node_dir, - &on_node); - if (!debugfs_on_node) - goto err; + 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); - return 0; + debugfs_create_file("run", 0600, perf->dbgfs_dir, perf, + &perf_dbgfs_run); -err: - debugfs_remove_recursive(perf_debugfs_dir); - perf_debugfs_dir = NULL; - return -ENODEV; + 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 int perf_probe(struct ntb_client *client, struct ntb_dev *ntb) +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 pci_dev *pdev = ntb->pdev; struct perf_ctx *perf; - int node; - int rc = 0; - if (ntb_spad_count(ntb) < MAX_SPAD) { - dev_err(&ntb->dev, "Not enough scratch pad registers for %s", - DRIVER_NAME); - return -EIO; - } + perf = devm_kzalloc(&ntb->dev, sizeof(*perf), GFP_KERNEL); + if (!perf) + return ERR_PTR(-ENOMEM); - if (!ntb->ops->mw_set_trans) { - dev_err(&ntb->dev, "Need inbound MW based NTB API\n"); - return -EINVAL; + 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, peer->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; + + 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 %#llx\n", peer->pidx, + peer->outbuf_size); } - if (ntb_peer_port_count(ntb) != NTB_DEF_PEER_CNT) - dev_warn(&ntb->dev, "Multi-port NTB devices unsupported\n"); + return 0; +} - node = on_node ? dev_to_node(&pdev->dev) : NUMA_NO_NODE; - perf = kzalloc_node(sizeof(*perf), GFP_KERNEL, node); - if (!perf) { - rc = -ENOMEM; - goto err_perf; +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); } + if (perf->gidx == -1) + perf->gidx = pidx; - perf->ntb = ntb; - perf->perf_threads = 1; - atomic_set(&perf->tsync, 0); - mutex_init(&perf->run_mutex); - spin_lock_init(&perf->db_lock); - perf_setup_mw(ntb, perf); - init_waitqueue_head(&perf->link_wq); - INIT_DELAYED_WORK(&perf->link_work, perf_link_work); + 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; +} - rc = ntb_set_ctx(ntb, perf, &perf_ops); - if (rc) - goto err_ctx; +static int perf_probe(struct ntb_client *client, struct ntb_dev *ntb) +{ + struct perf_ctx *perf; + int ret; - perf->link_is_up = false; - ntb_link_enable(ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO); - ntb_link_event(ntb); + perf = perf_create_data(ntb); + if (IS_ERR(perf)) + return PTR_ERR(perf); - rc = perf_debugfs_setup(perf); - if (rc) - goto err_ctx; + ret = perf_init_peers(perf); + if (ret) + return ret; - perf_clear_thread_status(perf); + perf_init_threads(perf); - return 0; + ret = perf_init_service(perf); + if (ret) + return ret; -err_ctx: - cancel_delayed_work_sync(&perf->link_work); - kfree(perf); -err_perf: - return rc; + 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; - int i; - dev_dbg(&perf->ntb->dev, "%s called\n", __func__); + perf_clear_dbgfs(perf); - mutex_lock(&perf->run_mutex); + perf_disable_service(perf); - cancel_delayed_work_sync(&perf->link_work); + perf_clear_threads(perf); +} - ntb_clear_ctx(ntb); - ntb_link_disable(ntb); +static struct ntb_client perf_client = { + .ops = { + .probe = perf_probe, + .remove = perf_remove + } +}; - debugfs_remove_recursive(perf_debugfs_dir); - perf_debugfs_dir = NULL; +static int __init perf_init(void) +{ + int ret; - if (use_dma) { - for (i = 0; i < MAX_THREADS; i++) { - struct pthr_ctx *pctx = &perf->pthr_ctx[i]; + if (chunk_order > MAX_CHUNK_ORDER) { + chunk_order = MAX_CHUNK_ORDER; + pr_info("Chunk order reduced to %hhu\n", chunk_order); + } - if (pctx->dma_chan) - dma_release_channel(pctx->dma_chan); - } + if (total_order < chunk_order) { + total_order = chunk_order; + pr_info("Total data order reduced to %hhu\n", total_order); } - kfree(perf); + 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); -static struct ntb_client perf_client = { - .ops = { - .probe = perf_probe, - .remove = perf_remove, - }, -}; -module_ntb_client(perf_client); |