mirror of https://gitee.com/openkylin/linux.git
376 lines
9.3 KiB
C
376 lines
9.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2020 Hisilicon Limited.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/debugfs.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/device.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/kthread.h>
|
|
#include <linux/math64.h>
|
|
#include <linux/module.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/timekeeping.h>
|
|
|
|
#define DMA_MAP_BENCHMARK _IOWR('d', 1, struct map_benchmark)
|
|
#define DMA_MAP_MAX_THREADS 1024
|
|
#define DMA_MAP_MAX_SECONDS 300
|
|
#define DMA_MAP_MAX_TRANS_DELAY (10 * NSEC_PER_MSEC)
|
|
|
|
#define DMA_MAP_BIDIRECTIONAL 0
|
|
#define DMA_MAP_TO_DEVICE 1
|
|
#define DMA_MAP_FROM_DEVICE 2
|
|
|
|
struct map_benchmark {
|
|
__u64 avg_map_100ns; /* average map latency in 100ns */
|
|
__u64 map_stddev; /* standard deviation of map latency */
|
|
__u64 avg_unmap_100ns; /* as above */
|
|
__u64 unmap_stddev;
|
|
__u32 threads; /* how many threads will do map/unmap in parallel */
|
|
__u32 seconds; /* how long the test will last */
|
|
__s32 node; /* which numa node this benchmark will run on */
|
|
__u32 dma_bits; /* DMA addressing capability */
|
|
__u32 dma_dir; /* DMA data direction */
|
|
__u32 dma_trans_ns; /* time for DMA transmission in ns */
|
|
__u8 expansion[80]; /* For future use */
|
|
};
|
|
|
|
struct map_benchmark_data {
|
|
struct map_benchmark bparam;
|
|
struct device *dev;
|
|
struct dentry *debugfs;
|
|
enum dma_data_direction dir;
|
|
atomic64_t sum_map_100ns;
|
|
atomic64_t sum_unmap_100ns;
|
|
atomic64_t sum_sq_map;
|
|
atomic64_t sum_sq_unmap;
|
|
atomic64_t loops;
|
|
};
|
|
|
|
static int map_benchmark_thread(void *data)
|
|
{
|
|
void *buf;
|
|
dma_addr_t dma_addr;
|
|
struct map_benchmark_data *map = data;
|
|
int ret = 0;
|
|
|
|
buf = (void *)__get_free_page(GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
while (!kthread_should_stop()) {
|
|
u64 map_100ns, unmap_100ns, map_sq, unmap_sq;
|
|
ktime_t map_stime, map_etime, unmap_stime, unmap_etime;
|
|
ktime_t map_delta, unmap_delta;
|
|
|
|
/*
|
|
* for a non-coherent device, if we don't stain them in the
|
|
* cache, this will give an underestimate of the real-world
|
|
* overhead of BIDIRECTIONAL or TO_DEVICE mappings;
|
|
* 66 means evertything goes well! 66 is lucky.
|
|
*/
|
|
if (map->dir != DMA_FROM_DEVICE)
|
|
memset(buf, 0x66, PAGE_SIZE);
|
|
|
|
map_stime = ktime_get();
|
|
dma_addr = dma_map_single(map->dev, buf, PAGE_SIZE, map->dir);
|
|
if (unlikely(dma_mapping_error(map->dev, dma_addr))) {
|
|
pr_err("dma_map_single failed on %s\n",
|
|
dev_name(map->dev));
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
map_etime = ktime_get();
|
|
map_delta = ktime_sub(map_etime, map_stime);
|
|
|
|
/* Pretend DMA is transmitting */
|
|
ndelay(map->bparam.dma_trans_ns);
|
|
|
|
unmap_stime = ktime_get();
|
|
dma_unmap_single(map->dev, dma_addr, PAGE_SIZE, map->dir);
|
|
unmap_etime = ktime_get();
|
|
unmap_delta = ktime_sub(unmap_etime, unmap_stime);
|
|
|
|
/* calculate sum and sum of squares */
|
|
|
|
map_100ns = div64_ul(map_delta, 100);
|
|
unmap_100ns = div64_ul(unmap_delta, 100);
|
|
map_sq = map_100ns * map_100ns;
|
|
unmap_sq = unmap_100ns * unmap_100ns;
|
|
|
|
atomic64_add(map_100ns, &map->sum_map_100ns);
|
|
atomic64_add(unmap_100ns, &map->sum_unmap_100ns);
|
|
atomic64_add(map_sq, &map->sum_sq_map);
|
|
atomic64_add(unmap_sq, &map->sum_sq_unmap);
|
|
atomic64_inc(&map->loops);
|
|
}
|
|
|
|
out:
|
|
free_page((unsigned long)buf);
|
|
return ret;
|
|
}
|
|
|
|
static int do_map_benchmark(struct map_benchmark_data *map)
|
|
{
|
|
struct task_struct **tsk;
|
|
int threads = map->bparam.threads;
|
|
int node = map->bparam.node;
|
|
const cpumask_t *cpu_mask = cpumask_of_node(node);
|
|
u64 loops;
|
|
int ret = 0;
|
|
int i;
|
|
|
|
tsk = kmalloc_array(threads, sizeof(*tsk), GFP_KERNEL);
|
|
if (!tsk)
|
|
return -ENOMEM;
|
|
|
|
get_device(map->dev);
|
|
|
|
for (i = 0; i < threads; i++) {
|
|
tsk[i] = kthread_create_on_node(map_benchmark_thread, map,
|
|
map->bparam.node, "dma-map-benchmark/%d", i);
|
|
if (IS_ERR(tsk[i])) {
|
|
pr_err("create dma_map thread failed\n");
|
|
ret = PTR_ERR(tsk[i]);
|
|
goto out;
|
|
}
|
|
|
|
if (node != NUMA_NO_NODE)
|
|
kthread_bind_mask(tsk[i], cpu_mask);
|
|
}
|
|
|
|
/* clear the old value in the previous benchmark */
|
|
atomic64_set(&map->sum_map_100ns, 0);
|
|
atomic64_set(&map->sum_unmap_100ns, 0);
|
|
atomic64_set(&map->sum_sq_map, 0);
|
|
atomic64_set(&map->sum_sq_unmap, 0);
|
|
atomic64_set(&map->loops, 0);
|
|
|
|
for (i = 0; i < threads; i++) {
|
|
get_task_struct(tsk[i]);
|
|
wake_up_process(tsk[i]);
|
|
}
|
|
|
|
msleep_interruptible(map->bparam.seconds * 1000);
|
|
|
|
/* wait for the completion of benchmark threads */
|
|
for (i = 0; i < threads; i++) {
|
|
ret = kthread_stop(tsk[i]);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
loops = atomic64_read(&map->loops);
|
|
if (likely(loops > 0)) {
|
|
u64 map_variance, unmap_variance;
|
|
u64 sum_map = atomic64_read(&map->sum_map_100ns);
|
|
u64 sum_unmap = atomic64_read(&map->sum_unmap_100ns);
|
|
u64 sum_sq_map = atomic64_read(&map->sum_sq_map);
|
|
u64 sum_sq_unmap = atomic64_read(&map->sum_sq_unmap);
|
|
|
|
/* average latency */
|
|
map->bparam.avg_map_100ns = div64_u64(sum_map, loops);
|
|
map->bparam.avg_unmap_100ns = div64_u64(sum_unmap, loops);
|
|
|
|
/* standard deviation of latency */
|
|
map_variance = div64_u64(sum_sq_map, loops) -
|
|
map->bparam.avg_map_100ns *
|
|
map->bparam.avg_map_100ns;
|
|
unmap_variance = div64_u64(sum_sq_unmap, loops) -
|
|
map->bparam.avg_unmap_100ns *
|
|
map->bparam.avg_unmap_100ns;
|
|
map->bparam.map_stddev = int_sqrt64(map_variance);
|
|
map->bparam.unmap_stddev = int_sqrt64(unmap_variance);
|
|
}
|
|
|
|
out:
|
|
for (i = 0; i < threads; i++)
|
|
put_task_struct(tsk[i]);
|
|
put_device(map->dev);
|
|
kfree(tsk);
|
|
return ret;
|
|
}
|
|
|
|
static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct map_benchmark_data *map = file->private_data;
|
|
void __user *argp = (void __user *)arg;
|
|
u64 old_dma_mask;
|
|
|
|
int ret;
|
|
|
|
if (copy_from_user(&map->bparam, argp, sizeof(map->bparam)))
|
|
return -EFAULT;
|
|
|
|
switch (cmd) {
|
|
case DMA_MAP_BENCHMARK:
|
|
if (map->bparam.threads == 0 ||
|
|
map->bparam.threads > DMA_MAP_MAX_THREADS) {
|
|
pr_err("invalid thread number\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (map->bparam.seconds == 0 ||
|
|
map->bparam.seconds > DMA_MAP_MAX_SECONDS) {
|
|
pr_err("invalid duration seconds\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (map->bparam.dma_trans_ns > DMA_MAP_MAX_TRANS_DELAY) {
|
|
pr_err("invalid transmission delay\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (map->bparam.node != NUMA_NO_NODE &&
|
|
!node_possible(map->bparam.node)) {
|
|
pr_err("invalid numa node\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (map->bparam.dma_dir) {
|
|
case DMA_MAP_BIDIRECTIONAL:
|
|
map->dir = DMA_BIDIRECTIONAL;
|
|
break;
|
|
case DMA_MAP_FROM_DEVICE:
|
|
map->dir = DMA_FROM_DEVICE;
|
|
break;
|
|
case DMA_MAP_TO_DEVICE:
|
|
map->dir = DMA_TO_DEVICE;
|
|
break;
|
|
default:
|
|
pr_err("invalid DMA direction\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
old_dma_mask = dma_get_mask(map->dev);
|
|
|
|
ret = dma_set_mask(map->dev,
|
|
DMA_BIT_MASK(map->bparam.dma_bits));
|
|
if (ret) {
|
|
pr_err("failed to set dma_mask on device %s\n",
|
|
dev_name(map->dev));
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = do_map_benchmark(map);
|
|
|
|
/*
|
|
* restore the original dma_mask as many devices' dma_mask are
|
|
* set by architectures, acpi, busses. When we bind them back
|
|
* to their original drivers, those drivers shouldn't see
|
|
* dma_mask changed by benchmark
|
|
*/
|
|
dma_set_mask(map->dev, old_dma_mask);
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (copy_to_user(argp, &map->bparam, sizeof(map->bparam)))
|
|
return -EFAULT;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct file_operations map_benchmark_fops = {
|
|
.open = simple_open,
|
|
.unlocked_ioctl = map_benchmark_ioctl,
|
|
};
|
|
|
|
static void map_benchmark_remove_debugfs(void *data)
|
|
{
|
|
struct map_benchmark_data *map = (struct map_benchmark_data *)data;
|
|
|
|
debugfs_remove(map->debugfs);
|
|
}
|
|
|
|
static int __map_benchmark_probe(struct device *dev)
|
|
{
|
|
struct dentry *entry;
|
|
struct map_benchmark_data *map;
|
|
int ret;
|
|
|
|
map = devm_kzalloc(dev, sizeof(*map), GFP_KERNEL);
|
|
if (!map)
|
|
return -ENOMEM;
|
|
map->dev = dev;
|
|
|
|
ret = devm_add_action(dev, map_benchmark_remove_debugfs, map);
|
|
if (ret) {
|
|
pr_err("Can't add debugfs remove action\n");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* we only permit a device bound with this driver, 2nd probe
|
|
* will fail
|
|
*/
|
|
entry = debugfs_create_file("dma_map_benchmark", 0600, NULL, map,
|
|
&map_benchmark_fops);
|
|
if (IS_ERR(entry))
|
|
return PTR_ERR(entry);
|
|
map->debugfs = entry;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int map_benchmark_platform_probe(struct platform_device *pdev)
|
|
{
|
|
return __map_benchmark_probe(&pdev->dev);
|
|
}
|
|
|
|
static struct platform_driver map_benchmark_platform_driver = {
|
|
.driver = {
|
|
.name = "dma_map_benchmark",
|
|
},
|
|
.probe = map_benchmark_platform_probe,
|
|
};
|
|
|
|
static int
|
|
map_benchmark_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
|
|
{
|
|
return __map_benchmark_probe(&pdev->dev);
|
|
}
|
|
|
|
static struct pci_driver map_benchmark_pci_driver = {
|
|
.name = "dma_map_benchmark",
|
|
.probe = map_benchmark_pci_probe,
|
|
};
|
|
|
|
static int __init map_benchmark_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = pci_register_driver(&map_benchmark_pci_driver);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = platform_driver_register(&map_benchmark_platform_driver);
|
|
if (ret) {
|
|
pci_unregister_driver(&map_benchmark_pci_driver);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __exit map_benchmark_cleanup(void)
|
|
{
|
|
platform_driver_unregister(&map_benchmark_platform_driver);
|
|
pci_unregister_driver(&map_benchmark_pci_driver);
|
|
}
|
|
|
|
module_init(map_benchmark_init);
|
|
module_exit(map_benchmark_cleanup);
|
|
|
|
MODULE_AUTHOR("Barry Song <song.bao.hua@hisilicon.com>");
|
|
MODULE_DESCRIPTION("dma_map benchmark driver");
|
|
MODULE_LICENSE("GPL");
|