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The original code put five u32 before a u64 expansion[10] array. Five is
odd, this will cause trouble in the extension of the structure by adding
new features. This patch moves to use u8 for reserved field to avoid
future alignment risk.
Meanwhile, it also clears the memory of struct map_benchmark in tools,
otherwise, if users use old version to run on newer kernel, the random
expansion value will cause side effect on newer kernel.
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
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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>
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Nowadays, there are increasing requirements to benchmark the performance
of dma_map and dma_unmap particually while the device is attached to an
IOMMU.
This patch enables the support. Users can run specified number of threads
to do dma_map_page and dma_unmap_page on a specific NUMA node with the
specified duration. Then dma_map_benchmark will calculate the average
latency for map and unmap.
A difficulity for this benchmark is that dma_map/unmap APIs must run on
a particular device. Each device might have different backend of IOMMU or
non-IOMMU.
So we use the driver_override to bind dma_map_benchmark to a particual
device by:
For platform devices:
echo dma_map_benchmark > /sys/bus/platform/devices/xxx/driver_override
echo xxx > /sys/bus/platform/drivers/xxx/unbind
echo xxx > /sys/bus/platform/drivers/dma_map_benchmark/bind
For PCI devices:
echo dma_map_benchmark > /sys/bus/pci/devices/0000:00:01.0/driver_override
echo 0000:00:01.0 > /sys/bus/pci/drivers/xxx/unbind
echo 0000:00:01.0 > /sys/bus/pci/drivers/dma_map_benchmark/bind
Cc: Will Deacon <will@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
[hch: folded in two fixes from Colin Ian King <colin.king@canonical.com>]
Signed-off-by: Christoph Hellwig <hch@lst.de>
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