[LTP] 答复: [PATCH] ltp_tpci.c: Add release operation before allocation

[wangxin (CQ)]

Hi Petr,

The following is the kernel version information of the test case. The hardware information is in the attachment.

# uname -a
Linux hulk-168 4.19.195+ #1 SMP Tue Jun 29 09:42:18 EDT 2021 aarch64 aarch64 aarch64 GNU/Linux
# lscpu 
Architecture:        aarch64
Byte Order:          Little Endian
CPU(s):              128
On-line CPU(s) list: 0-127
Thread(s) per core:  1
Core(s) per socket:  64
Socket(s):           2
NUMA node(s):        4
Vendor ID:           0x48
Model:               0
Stepping:            0x1
CPU max MHz:         2600.0000
CPU min MHz:         200.0000
BogoMIPS:            200.00
L1d cache:           64K
L1i cache:           64K
L2 cache:            512K
L3 cache:            65536K
NUMA node0 CPU(s):   0-31
NUMA node1 CPU(s):   32-63
NUMA node2 CPU(s):   64-95
NUMA node3 CPU(s):   96-127
Flags:               fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma dcpop asimddp asimdfhm

Kind regards,
Xin

-----邮件原件-----
发件人: Petr Vorel [mailto:pvorel@suse.cz] 
发送时间: 2021年6月29日 4:30
收件人: wangxin (CQ) <wangxin410@huawei.com>
抄送: ltp@lists.linux.it; Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
主题: Re: [LTP] [PATCH] ltp_tpci.c: Add release operation before allocation

Hi Xin,

> When we run the test case, the following results will be obtained:
> test_pci  283  TPASS  :  PCI bus 7d slot 00 : Test-case '11'
> test_pci  284  TFAIL  :  tpci.c:74: PCI bus 7d slot 00 : Test-case '12'
> ...
> test_pci  300  TFAIL  :  tpci.c:74: PCI bus 7d slot 01 : Test-case '12'
> test_pci  301  TPASS  :  PCI bus 7d slot 01 : Test-case '13'

> The analysis is that the space allocated by the bios is insufficient.
> The solution to this problem can be in add pci_release_resource(dev, 
> i) before system resources are reallocated.Because the resources have 
> been allocated when the system is initialized.If it is redistributed, 
> it should be released and then allocated.

I wonder if this is the same issue as the one described by Krzysztof in his
patch:
https://patchwork.ozlabs.org/project/ltp/patch/20210401125127.45600-1-wangxin410@huawei.com/

Could you please share what HW and kernel you use and post dmesg?

Kind regards,
Petr

> Signed-off-by: Wang Xin <wangxin410@huawei.com>
> ---
>  testcases/kernel/device-drivers/pci/tpci_kernel/ltp_tpci.c | 1 +
>  1 file changed, 1 insertion(+)

> diff --git 
> a/testcases/kernel/device-drivers/pci/tpci_kernel/ltp_tpci.c 
> b/testcases/kernel/device-drivers/pci/tpci_kernel/ltp_tpci.c
> index e29821dda..5b0896093 100644
> --- a/testcases/kernel/device-drivers/pci/tpci_kernel/ltp_tpci.c
> +++ b/testcases/kernel/device-drivers/pci/tpci_kernel/ltp_tpci.c
> @@ -439,6 +439,7 @@ static int test_assign_resources(void)
>  		if (r->flags & IORESOURCE_MEM &&
>  			r->flags & IORESOURCE_PREFETCH) {
> +			pci_release_resource(dev, i);
>  			ret = pci_assign_resource(dev, i);
>  			prk_info("assign resource to '%d', ret '%d'", i, ret);
>  			rc |= (ret < 0 && ret != -EBUSY) ? TFAIL : TPASS;
> 2.17.1
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