RE: [PATCH] Revert "ACPI: power: Turn off unused power resources unconditionally"

["Zhang, Rui" <rui.zhang@intel.com>]

Hi, Shujun,

I'm experiencing similar problem, and it should be a BIOS problem, which can be fixed by a customized DSDT.
Can you please attach the full acpidump output on this machine? I just want to make sure if it is the same problem.

Thanks,
rui

> -----Original Message-----
> From: Shujun Wang <wsj20369@163.com>
> Sent: Friday, April 30, 2021 8:42 PM
> To: rjw@rjwysocki.net; lenb@kernel.org; linux-acpi@vger.kernel.org; linux-
> kernel@vger.kernel.org
> Cc: Shujun Wang <wsj20369@163.com>
> Subject: [PATCH] Revert "ACPI: power: Turn off unused power resources
> unconditionally"
> 
> This reverts commit 7e4fdeafa61f2b653fcf9678f09935e55756aed2.
> It may cause some NVMe device probes to fail, and the system may get stuck
> when using an NVMe device as the root filesystem.
> 
> In the function nvme_pci_enable(struct nvme_dev *dev), as shown below,
> readl(NVME_REG_CSTS) always returns -1 with the commit, which results in
> the probe failed.
> 
>   if (readl(dev->bar + NVME_REG_CSTS) == -1) {
> 	result = -ENODEV;
> 	goto disable;
>   }
> 
> dmesg:
>   [    1.106280] nvme 0000:04:00.0: platform quirk: setting simple suspend
>   [    1.109111] nvme nvme0: pci function 0000:04:00.0
>   [    1.113066] nvme 0000:04:00.0: enabling device (0000 -> 0002)
>   [    1.121040] nvme nvme0: Removing after probe failure status: -19
> 
> lspci:
>   Non-Volatile memory controller: KIOXIA Corporation Device 0001
> 
> device uevent:
>   DRIVER=nvme
>   PCI_CLASS=10802
>   PCI_ID=1E0F:0001
>   PCI_SUBSYS_ID=1E0F:0001
>   PCI_SLOT_NAME=0000:04:00.0
>   MODALIAS=pci:v00001E0Fd00000001sv00001E0Fsd00000001bc01sc08i02
> 
> This patch was tested in Lenovo Thinkpad X1.
> 
> Signed-off-by: Shujun Wang <wsj20369@163.com>
> ---
>  drivers/acpi/power.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/acpi/power.c b/drivers/acpi/power.c index
> 56102eaaa2da..8bf10abeb2e0 100644
> --- a/drivers/acpi/power.c
> +++ b/drivers/acpi/power.c
> @@ -1004,9 +1004,18 @@ void
> acpi_turn_off_unused_power_resources(void)
>  	mutex_lock(&power_resource_list_lock);
> 
>  	list_for_each_entry_reverse(resource, &acpi_power_resource_list,
> list_node) {
> +		int result, state;
> +
>  		mutex_lock(&resource->resource_lock);
> 
> -		if (!resource->ref_count) {
> +		result = acpi_power_get_state(resource->device.handle,
> &state);
> +		if (result) {
> +			mutex_unlock(&resource->resource_lock);
> +			continue;
> +		}
> +
> +		if (state == ACPI_POWER_RESOURCE_STATE_ON
> +		    && !resource->ref_count) {
>  			dev_info(&resource->device.dev, "Turning OFF\n");
>  			__acpi_power_off(resource);
>  		}
> --
> 2.25.1