> From: Kenneth R. Crudup <ke...@panix.com>
>
> I've been running Linus' master branch on my laptop (Dell XPS 13
> 2-in-1). With this commit in place, after resuming from hibernate
> my machine is essentially useless, with a torrent of disk I/O errors
> on my NVMe device (at least, and possibly other devices affected)
> until a reboot.
>
> I do use tlp to set the PCIe ASPM to "performance" on AC and
> "powersupersave" on battery.
Thanks a lot for the report, and sorry for the breakage.
4257f7e008ea restores PCI_L1SS_CTL1, then PCI_L1SS_CTL2. I think it
should do those in the reverse order, since the Enable bits are in
PCI_L1SS_CTL1. It also restores L1SS state (potentially enabling
L1.x) before we restore the PCIe Capability (potentially enabling ASPM
as a whole). Those probably should also be in the other order.
If it's convenient, can you try the patch below? If the debug patch
doesn't help:
- Are you seeing the hibernate/resume problem when on AC or on
battery?
- What if you don't use tlp? Does hibernate/resume work fine then?
If tlp makes a difference, can you collect "sudo lspci -vv" output
with and without using tlp (before hibernate)?
- If you revert 4257f7e008ea, does hibernate/resume work fine? Both
with the tlp tweak and without?
- Collect "sudo lspci -vv" output before hibernate and (if possible)
after resume when you see the problem.
I guess tlp only uses /sys/module/pcie_aspm/parameters/policy, so it
sets the same ASPM policy system-wide.
Bjorn
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index b9fecc25d213..6598b5cd3154 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1665,9 +1665,8 @@ void pci_restore_state(struct pci_dev *dev)
* LTR itself (in the PCIe capability).
*/
pci_restore_ltr_state(dev);
- pci_restore_aspm_l1ss_state(dev);
-
pci_restore_pcie_state(dev);
+ pci_restore_aspm_l1ss_state(dev);
pci_restore_pasid_state(dev);
pci_restore_pri_state(dev);
pci_restore_ats_state(dev);
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index a08e7d6dc248..c4a99274b4bb 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -752,8 +752,8 @@ void pci_save_aspm_l1ss_state(struct pci_dev *dev)
return;
cap = (u32 *)&save_state->cap.data[0];
- pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++);
pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++);
+ pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++);
}
void pci_restore_aspm_l1ss_state(struct pci_dev *dev)
@@ -774,8 +774,8 @@ void pci_restore_aspm_l1ss_state(struct pci_dev *dev)
return;
cap = (u32 *)&save_state->cap.data[0];
- pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++);
pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++);
+ pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++);
}
static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val)
