2020-11-16 14:08:47 +08:00
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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2021-03-30 14:33:48 +08:00
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* Copyright (C) 2020 HiSilicon Limited.
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2020-11-16 14:08:47 +08:00
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/debugfs.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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2022-03-08 16:59:10 +08:00
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#include <linux/map_benchmark.h>
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2020-11-16 14:08:47 +08:00
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#include <linux/math64.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/timekeeping.h>
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struct map_benchmark_data {
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struct map_benchmark bparam;
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struct device *dev;
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struct dentry *debugfs;
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enum dma_data_direction dir;
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atomic64_t sum_map_100ns;
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atomic64_t sum_unmap_100ns;
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atomic64_t sum_sq_map;
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atomic64_t sum_sq_unmap;
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atomic64_t loops;
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};
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static int map_benchmark_thread(void *data)
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{
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void *buf;
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dma_addr_t dma_addr;
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struct map_benchmark_data *map = data;
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2021-03-18 17:29:30 +08:00
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int npages = map->bparam.granule;
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u64 size = npages * PAGE_SIZE;
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2020-11-16 14:08:47 +08:00
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int ret = 0;
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2021-03-18 17:29:30 +08:00
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buf = alloc_pages_exact(size, GFP_KERNEL);
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2020-11-16 14:08:47 +08:00
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if (!buf)
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return -ENOMEM;
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while (!kthread_should_stop()) {
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u64 map_100ns, unmap_100ns, map_sq, unmap_sq;
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ktime_t map_stime, map_etime, unmap_stime, unmap_etime;
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ktime_t map_delta, unmap_delta;
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/*
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* for a non-coherent device, if we don't stain them in the
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* cache, this will give an underestimate of the real-world
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* overhead of BIDIRECTIONAL or TO_DEVICE mappings;
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* 66 means evertything goes well! 66 is lucky.
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*/
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if (map->dir != DMA_FROM_DEVICE)
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2021-03-18 17:29:30 +08:00
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memset(buf, 0x66, size);
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2020-11-16 14:08:47 +08:00
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map_stime = ktime_get();
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2021-03-18 17:29:30 +08:00
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dma_addr = dma_map_single(map->dev, buf, size, map->dir);
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2020-11-16 14:08:47 +08:00
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if (unlikely(dma_mapping_error(map->dev, dma_addr))) {
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pr_err("dma_map_single failed on %s\n",
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dev_name(map->dev));
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ret = -ENOMEM;
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goto out;
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}
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map_etime = ktime_get();
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map_delta = ktime_sub(map_etime, map_stime);
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2021-02-05 19:33:25 +08:00
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/* Pretend DMA is transmitting */
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ndelay(map->bparam.dma_trans_ns);
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2020-11-16 14:08:47 +08:00
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unmap_stime = ktime_get();
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2021-03-18 17:29:30 +08:00
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dma_unmap_single(map->dev, dma_addr, size, map->dir);
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2020-11-16 14:08:47 +08:00
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unmap_etime = ktime_get();
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unmap_delta = ktime_sub(unmap_etime, unmap_stime);
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/* calculate sum and sum of squares */
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map_100ns = div64_ul(map_delta, 100);
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unmap_100ns = div64_ul(unmap_delta, 100);
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map_sq = map_100ns * map_100ns;
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unmap_sq = unmap_100ns * unmap_100ns;
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atomic64_add(map_100ns, &map->sum_map_100ns);
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atomic64_add(unmap_100ns, &map->sum_unmap_100ns);
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atomic64_add(map_sq, &map->sum_sq_map);
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atomic64_add(unmap_sq, &map->sum_sq_unmap);
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atomic64_inc(&map->loops);
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}
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out:
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2021-03-18 17:29:30 +08:00
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free_pages_exact(buf, size);
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2020-11-16 14:08:47 +08:00
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return ret;
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}
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static int do_map_benchmark(struct map_benchmark_data *map)
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{
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struct task_struct **tsk;
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int threads = map->bparam.threads;
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int node = map->bparam.node;
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const cpumask_t *cpu_mask = cpumask_of_node(node);
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u64 loops;
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int ret = 0;
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int i;
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tsk = kmalloc_array(threads, sizeof(*tsk), GFP_KERNEL);
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if (!tsk)
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return -ENOMEM;
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get_device(map->dev);
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for (i = 0; i < threads; i++) {
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tsk[i] = kthread_create_on_node(map_benchmark_thread, map,
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map->bparam.node, "dma-map-benchmark/%d", i);
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if (IS_ERR(tsk[i])) {
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pr_err("create dma_map thread failed\n");
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ret = PTR_ERR(tsk[i]);
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goto out;
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}
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if (node != NUMA_NO_NODE)
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kthread_bind_mask(tsk[i], cpu_mask);
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}
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/* clear the old value in the previous benchmark */
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atomic64_set(&map->sum_map_100ns, 0);
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atomic64_set(&map->sum_unmap_100ns, 0);
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atomic64_set(&map->sum_sq_map, 0);
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atomic64_set(&map->sum_sq_unmap, 0);
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atomic64_set(&map->loops, 0);
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dma-mapping: benchmark: fix kernel crash when dma_map_single fails
if dma_map_single() fails, kernel will give the below oops since
task_struct has been destroyed and we are running into the memory
corruption due to use-after-free in kthread_stop():
[ 48.095310] Unable to handle kernel paging request at virtual address 000000c473548040
[ 48.095736] Mem abort info:
[ 48.095864] ESR = 0x96000004
[ 48.096025] EC = 0x25: DABT (current EL), IL = 32 bits
[ 48.096268] SET = 0, FnV = 0
[ 48.096401] EA = 0, S1PTW = 0
[ 48.096538] Data abort info:
[ 48.096659] ISV = 0, ISS = 0x00000004
[ 48.096820] CM = 0, WnR = 0
[ 48.097079] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000104639000
[ 48.098099] [000000c473548040] pgd=0000000000000000, p4d=0000000000000000
[ 48.098832] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 48.099232] Modules linked in:
[ 48.099387] CPU: 0 PID: 2 Comm: kthreadd Tainted: G W
[ 48.099887] Hardware name: linux,dummy-virt (DT)
[ 48.100078] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
[ 48.100516] pc : __kmalloc_node+0x214/0x368
[ 48.100944] lr : __kmalloc_node+0x1f4/0x368
[ 48.101458] sp : ffff800011f0bb80
[ 48.101843] x29: ffff800011f0bb80 x28: ffff0000c0098ec0
[ 48.102330] x27: 0000000000000000 x26: 00000000001d4600
[ 48.102648] x25: ffff0000c0098ec0 x24: ffff800011b6a000
[ 48.102988] x23: 00000000ffffffff x22: ffff0000c0098ec0
[ 48.103333] x21: ffff8000101d7a54 x20: 0000000000000dc0
[ 48.103657] x19: ffff0000c0001e00 x18: 0000000000000000
[ 48.104069] x17: 0000000000000000 x16: 0000000000000000
[ 48.105449] x15: 000001aa0304e7b9 x14: 00000000000003b1
[ 48.106401] x13: ffff8000122d5000 x12: ffff80001228d000
[ 48.107296] x11: ffff0000c0154340 x10: 0000000000000000
[ 48.107862] x9 : ffff80000fffffff x8 : ffff0000c473527f
[ 48.108326] x7 : ffff800011e62f58 x6 : ffff0000c01c8ed8
[ 48.108778] x5 : ffff0000c0098ec0 x4 : 0000000000000000
[ 48.109223] x3 : 00000000001d4600 x2 : 0000000000000040
[ 48.109656] x1 : 0000000000000001 x0 : ff0000c473548000
[ 48.110104] Call trace:
[ 48.110287] __kmalloc_node+0x214/0x368
[ 48.110493] __vmalloc_node_range+0xc4/0x298
[ 48.110805] copy_process+0x2c8/0x15c8
[ 48.111133] kernel_clone+0x5c/0x3c0
[ 48.111373] kernel_thread+0x64/0x90
[ 48.111604] kthreadd+0x158/0x368
[ 48.111810] ret_from_fork+0x10/0x30
[ 48.112336] Code: 17ffffe9 b9402a62 b94008a1 11000421 (f8626802)
[ 48.112884] ---[ end trace d4890e21e75419d5 ]---
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-01-25 09:13:06 +08:00
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for (i = 0; i < threads; i++) {
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get_task_struct(tsk[i]);
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2020-11-16 14:08:47 +08:00
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wake_up_process(tsk[i]);
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dma-mapping: benchmark: fix kernel crash when dma_map_single fails
if dma_map_single() fails, kernel will give the below oops since
task_struct has been destroyed and we are running into the memory
corruption due to use-after-free in kthread_stop():
[ 48.095310] Unable to handle kernel paging request at virtual address 000000c473548040
[ 48.095736] Mem abort info:
[ 48.095864] ESR = 0x96000004
[ 48.096025] EC = 0x25: DABT (current EL), IL = 32 bits
[ 48.096268] SET = 0, FnV = 0
[ 48.096401] EA = 0, S1PTW = 0
[ 48.096538] Data abort info:
[ 48.096659] ISV = 0, ISS = 0x00000004
[ 48.096820] CM = 0, WnR = 0
[ 48.097079] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000104639000
[ 48.098099] [000000c473548040] pgd=0000000000000000, p4d=0000000000000000
[ 48.098832] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 48.099232] Modules linked in:
[ 48.099387] CPU: 0 PID: 2 Comm: kthreadd Tainted: G W
[ 48.099887] Hardware name: linux,dummy-virt (DT)
[ 48.100078] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
[ 48.100516] pc : __kmalloc_node+0x214/0x368
[ 48.100944] lr : __kmalloc_node+0x1f4/0x368
[ 48.101458] sp : ffff800011f0bb80
[ 48.101843] x29: ffff800011f0bb80 x28: ffff0000c0098ec0
[ 48.102330] x27: 0000000000000000 x26: 00000000001d4600
[ 48.102648] x25: ffff0000c0098ec0 x24: ffff800011b6a000
[ 48.102988] x23: 00000000ffffffff x22: ffff0000c0098ec0
[ 48.103333] x21: ffff8000101d7a54 x20: 0000000000000dc0
[ 48.103657] x19: ffff0000c0001e00 x18: 0000000000000000
[ 48.104069] x17: 0000000000000000 x16: 0000000000000000
[ 48.105449] x15: 000001aa0304e7b9 x14: 00000000000003b1
[ 48.106401] x13: ffff8000122d5000 x12: ffff80001228d000
[ 48.107296] x11: ffff0000c0154340 x10: 0000000000000000
[ 48.107862] x9 : ffff80000fffffff x8 : ffff0000c473527f
[ 48.108326] x7 : ffff800011e62f58 x6 : ffff0000c01c8ed8
[ 48.108778] x5 : ffff0000c0098ec0 x4 : 0000000000000000
[ 48.109223] x3 : 00000000001d4600 x2 : 0000000000000040
[ 48.109656] x1 : 0000000000000001 x0 : ff0000c473548000
[ 48.110104] Call trace:
[ 48.110287] __kmalloc_node+0x214/0x368
[ 48.110493] __vmalloc_node_range+0xc4/0x298
[ 48.110805] copy_process+0x2c8/0x15c8
[ 48.111133] kernel_clone+0x5c/0x3c0
[ 48.111373] kernel_thread+0x64/0x90
[ 48.111604] kthreadd+0x158/0x368
[ 48.111810] ret_from_fork+0x10/0x30
[ 48.112336] Code: 17ffffe9 b9402a62 b94008a1 11000421 (f8626802)
[ 48.112884] ---[ end trace d4890e21e75419d5 ]---
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-01-25 09:13:06 +08:00
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}
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2020-11-16 14:08:47 +08:00
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msleep_interruptible(map->bparam.seconds * 1000);
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/* wait for the completion of benchmark threads */
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for (i = 0; i < threads; i++) {
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ret = kthread_stop(tsk[i]);
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if (ret)
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goto out;
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}
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loops = atomic64_read(&map->loops);
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if (likely(loops > 0)) {
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u64 map_variance, unmap_variance;
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u64 sum_map = atomic64_read(&map->sum_map_100ns);
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u64 sum_unmap = atomic64_read(&map->sum_unmap_100ns);
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u64 sum_sq_map = atomic64_read(&map->sum_sq_map);
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u64 sum_sq_unmap = atomic64_read(&map->sum_sq_unmap);
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/* average latency */
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map->bparam.avg_map_100ns = div64_u64(sum_map, loops);
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map->bparam.avg_unmap_100ns = div64_u64(sum_unmap, loops);
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/* standard deviation of latency */
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map_variance = div64_u64(sum_sq_map, loops) -
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map->bparam.avg_map_100ns *
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map->bparam.avg_map_100ns;
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unmap_variance = div64_u64(sum_sq_unmap, loops) -
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map->bparam.avg_unmap_100ns *
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map->bparam.avg_unmap_100ns;
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map->bparam.map_stddev = int_sqrt64(map_variance);
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map->bparam.unmap_stddev = int_sqrt64(unmap_variance);
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}
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out:
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dma-mapping: benchmark: fix kernel crash when dma_map_single fails
if dma_map_single() fails, kernel will give the below oops since
task_struct has been destroyed and we are running into the memory
corruption due to use-after-free in kthread_stop():
[ 48.095310] Unable to handle kernel paging request at virtual address 000000c473548040
[ 48.095736] Mem abort info:
[ 48.095864] ESR = 0x96000004
[ 48.096025] EC = 0x25: DABT (current EL), IL = 32 bits
[ 48.096268] SET = 0, FnV = 0
[ 48.096401] EA = 0, S1PTW = 0
[ 48.096538] Data abort info:
[ 48.096659] ISV = 0, ISS = 0x00000004
[ 48.096820] CM = 0, WnR = 0
[ 48.097079] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000104639000
[ 48.098099] [000000c473548040] pgd=0000000000000000, p4d=0000000000000000
[ 48.098832] Internal error: Oops: 96000004 [#1] PREEMPT SMP
[ 48.099232] Modules linked in:
[ 48.099387] CPU: 0 PID: 2 Comm: kthreadd Tainted: G W
[ 48.099887] Hardware name: linux,dummy-virt (DT)
[ 48.100078] pstate: 60000005 (nZCv daif -PAN -UAO -TCO BTYPE=--)
[ 48.100516] pc : __kmalloc_node+0x214/0x368
[ 48.100944] lr : __kmalloc_node+0x1f4/0x368
[ 48.101458] sp : ffff800011f0bb80
[ 48.101843] x29: ffff800011f0bb80 x28: ffff0000c0098ec0
[ 48.102330] x27: 0000000000000000 x26: 00000000001d4600
[ 48.102648] x25: ffff0000c0098ec0 x24: ffff800011b6a000
[ 48.102988] x23: 00000000ffffffff x22: ffff0000c0098ec0
[ 48.103333] x21: ffff8000101d7a54 x20: 0000000000000dc0
[ 48.103657] x19: ffff0000c0001e00 x18: 0000000000000000
[ 48.104069] x17: 0000000000000000 x16: 0000000000000000
[ 48.105449] x15: 000001aa0304e7b9 x14: 00000000000003b1
[ 48.106401] x13: ffff8000122d5000 x12: ffff80001228d000
[ 48.107296] x11: ffff0000c0154340 x10: 0000000000000000
[ 48.107862] x9 : ffff80000fffffff x8 : ffff0000c473527f
[ 48.108326] x7 : ffff800011e62f58 x6 : ffff0000c01c8ed8
[ 48.108778] x5 : ffff0000c0098ec0 x4 : 0000000000000000
[ 48.109223] x3 : 00000000001d4600 x2 : 0000000000000040
[ 48.109656] x1 : 0000000000000001 x0 : ff0000c473548000
[ 48.110104] Call trace:
[ 48.110287] __kmalloc_node+0x214/0x368
[ 48.110493] __vmalloc_node_range+0xc4/0x298
[ 48.110805] copy_process+0x2c8/0x15c8
[ 48.111133] kernel_clone+0x5c/0x3c0
[ 48.111373] kernel_thread+0x64/0x90
[ 48.111604] kthreadd+0x158/0x368
[ 48.111810] ret_from_fork+0x10/0x30
[ 48.112336] Code: 17ffffe9 b9402a62 b94008a1 11000421 (f8626802)
[ 48.112884] ---[ end trace d4890e21e75419d5 ]---
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
2021-01-25 09:13:06 +08:00
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for (i = 0; i < threads; i++)
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put_task_struct(tsk[i]);
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2020-11-16 14:08:47 +08:00
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put_device(map->dev);
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kfree(tsk);
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return ret;
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}
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static long map_benchmark_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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struct map_benchmark_data *map = file->private_data;
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void __user *argp = (void __user *)arg;
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u64 old_dma_mask;
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int ret;
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if (copy_from_user(&map->bparam, argp, sizeof(map->bparam)))
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return -EFAULT;
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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;
|
|
|
|
}
|
|
|
|
|
2021-02-05 19:33:25 +08:00
|
|
|
if (map->bparam.dma_trans_ns > DMA_MAP_MAX_TRANS_DELAY) {
|
|
|
|
pr_err("invalid transmission delay\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2020-11-16 14:08:47 +08:00
|
|
|
if (map->bparam.node != NUMA_NO_NODE &&
|
|
|
|
!node_possible(map->bparam.node)) {
|
|
|
|
pr_err("invalid numa node\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2021-03-18 17:29:30 +08:00
|
|
|
if (map->bparam.granule < 1 || map->bparam.granule > 1024) {
|
|
|
|
pr_err("invalid granule size\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2020-11-16 14:08:47 +08:00
|
|
|
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");
|