From b29c009196c6565c62fcb74c526c75ac409d901d Mon Sep 17 00:00:00 2001 From: Thomas Lamprecht Date: Thu, 5 Sep 2024 09:26:59 +0200 Subject: [PATCH] cherry-pick "PCI: pciehp: Retain Power Indicator bits for userspace indicators" cherry-picked from Linux kernel.org upstream commit 5560a612c20d3daacbf5da7913deefa5c31742f4 The issue was reported in the enterprise support. The customer contacted the ledmon maintainer, who found that it is not an issue with ledmon, bisected the kernel and came up with this fix Originally-by: Fiona Ebner Signed-off-by: Thomas Lamprecht --- ...n-Power-Indicator-bits-for-userspace.patch | 54 +++++++++++++++++++ 1 file changed, 54 insertions(+) create mode 100644 patches/kernel/0020-PCI-pciehp-Retain-Power-Indicator-bits-for-userspace.patch diff --git a/patches/kernel/0020-PCI-pciehp-Retain-Power-Indicator-bits-for-userspace.patch b/patches/kernel/0020-PCI-pciehp-Retain-Power-Indicator-bits-for-userspace.patch new file mode 100644 index 0000000..7f29e5c --- /dev/null +++ b/patches/kernel/0020-PCI-pciehp-Retain-Power-Indicator-bits-for-userspace.patch @@ -0,0 +1,54 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Blazej Kucman +Date: Mon, 22 Jul 2024 16:14:40 +0200 +Subject: [PATCH] PCI: pciehp: Retain Power Indicator bits for userspace + indicators + +The sysfs "attention" file normally controls the Slot Control Attention +Indicator with 0 (off), 1 (on), 2 (blink) settings. + +576243b3f9ea ("PCI: pciehp: Allow exclusive userspace control of +indicators") added pciehp_set_raw_indicator_status() to allow userspace to +directly control all four bits in both the Attention Indicator and the +Power Indicator fields via the "attention" file. + +This is used on Intel VMD bridges so utilities like "ledmon" can use sysfs +"attention" to control up to 16 indicators for NVMe device RAID status. + +abaaac4845a0 ("PCI: hotplug: Use FIELD_GET/PREP()") broke this by masking +the sysfs data with PCI_EXP_SLTCTL_AIC, which discards the upper two bits +intended for the Power Indicator Control field (PCI_EXP_SLTCTL_PIC). + +For NVMe devices behind an Intel VMD, ledmon settings that use the +PCI_EXP_SLTCTL_PIC bits, i.e., ATTENTION_REBUILD (0x5), ATTENTION_LOCATE +(0x7), ATTENTION_FAILURE (0xD), ATTENTION_OFF (0xF), no longer worked +correctly. + +Mask with PCI_EXP_SLTCTL_AIC | PCI_EXP_SLTCTL_PIC to retain both the +Attention Indicator and the Power Indicator bits. + +Fixes: abaaac4845a0 ("PCI: hotplug: Use FIELD_GET/PREP()") +Link: https://lore.kernel.org/r/20240722141440.7210-1-blazej.kucman@intel.com +Signed-off-by: Blazej Kucman +[bhelgaas: commit log] +Signed-off-by: Bjorn Helgaas +Cc: stable@vger.kernel.org # v6.7+ +--- + drivers/pci/hotplug/pciehp_hpc.c | 4 +++- + 1 file changed, 3 insertions(+), 1 deletion(-) + +diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c +index b1d0a1b3917d..9d3c249207c4 100644 +--- a/drivers/pci/hotplug/pciehp_hpc.c ++++ b/drivers/pci/hotplug/pciehp_hpc.c +@@ -485,7 +485,9 @@ int pciehp_set_raw_indicator_status(struct hotplug_slot *hotplug_slot, + struct pci_dev *pdev = ctrl_dev(ctrl); + + pci_config_pm_runtime_get(pdev); +- pcie_write_cmd_nowait(ctrl, FIELD_PREP(PCI_EXP_SLTCTL_AIC, status), ++ ++ /* Attention and Power Indicator Control bits are supported */ ++ pcie_write_cmd_nowait(ctrl, FIELD_PREP(PCI_EXP_SLTCTL_AIC | PCI_EXP_SLTCTL_PIC, status), + PCI_EXP_SLTCTL_AIC | PCI_EXP_SLTCTL_PIC); + pci_config_pm_runtime_put(pdev); + return 0;