Various PCIe controllers that mux MSIs onto single IRQ line produce these "IRQ%d: set affinity failed" warnings when entering suspend. This has been discussed before [1] [2] and an example test case is included at the end of this commit message. Controller drivers which create MSI IRQ domain with MSI_FLAG_USE_DEF_CHIP_OPS flag set and which do not override the .irq_set_affinity irqchip callback get assigned default .irq_set_affinity = msi_domain_set_affinity() callback. That is not desired on controllers where it is not possible to set affinity of each MSI IRQ line to a specific CPU core due to hardware limitation. Introduce dedicated flag MSI_FLAG_NO_AFFINITY, which keeps .irq_set_affinity unset in case the controller driver did not assign the callback. This way, the migrate_one_irq() code in cpuhotplug.c can exit right away, without printing the aforementioned warning. The .irq_set_affinity implementations which only return -EINVAL can be removed from multiple controller drivers. ``` $ grep 25 /proc/interrupts 25: 0 0 0 0 0 0 0 0 PCIe MSI 0 Edge PCIe PME $ echo core > /sys/power/pm_test ; echo mem > /sys/power/state ... Disabling non-boot CPUs ... IRQ25: set affinity failed(-22). <---------- This is being silenced here psci: CPU7 killed (polled 4 ms) ... ``` [1] https://lore.kernel.org/all/d4a6eea3c5e33a3a4056885419df95a7@xxxxxxxxxx/ [2] https://lore.kernel.org/all/5f4947b18bf381615a37aa81c2242477@xxxxxxxxxx/ Signed-off-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxxxx> --- Cc: "Krzysztof Wilczyński" <kw@xxxxxxxxx> Cc: Anna-Maria Behnsen <anna-maria@xxxxxxxxxxxxx> Cc: Anup Patel <apatel@xxxxxxxxxxxxxxxx> Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> Cc: Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx> Cc: Jon Hunter <jonathanh@xxxxxxxxxx> Cc: Jonathan Hunter <jonathanh@xxxxxxxxxx> Cc: Koichiro Den <den@xxxxxxxxxxxxx> Cc: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx> Cc: Marc Zyngier <maz@xxxxxxxxxx> Cc: Nipun Gupta <nipun.gupta@xxxxxxx> Cc: Rob Herring <robh@xxxxxxxxxx> Cc: Shivamurthy Shastri <shivamurthy.shastri@xxxxxxxxxxxxx> Cc: Thierry Reding <thierry.reding@xxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx> Cc: linux-pci@xxxxxxxxxxxxxxx Cc: linux-renesas-soc@xxxxxxxxxxxxxxx Cc: linux-tegra@xxxxxxxxxxxxxxx --- V2: - Introduce MSI_FLAG_NO_AFFINITY to inhibit assignment of msi_domain_set_affinity() V3: - Replace MSI_FLAG_USE_DEF_CHIP_OPS_NOAFF with MSI_FLAG_NO_AFFINITY and make MSI_FLAG_NO_AFFINITY into separate flag - Update commit message - Rebase on current linux-next - Use genirq/msi: subject prefix which is likely better fit now - Split off R-Car part of the patch --- include/linux/msi.h | 2 ++ kernel/irq/msi.c | 2 +- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/msi.h b/include/linux/msi.h index 9449797638255..b10093c4d00ea 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -554,6 +554,8 @@ enum { MSI_FLAG_MSIX_CONTIGUOUS = (1 << 19), /* PCI/MSI-X vectors can be dynamically allocated/freed post MSI-X enable */ MSI_FLAG_PCI_MSIX_ALLOC_DYN = (1 << 20), + /* PCI MSIs cannot be steered separately to CPU cores */ + MSI_FLAG_NO_AFFINITY = (1 << 21), }; /** diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 5fa0547ece0c4..ca6e2ae6d6fc0 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -832,7 +832,7 @@ static void msi_domain_update_chip_ops(struct msi_domain_info *info) struct irq_chip *chip = info->chip; BUG_ON(!chip || !chip->irq_mask || !chip->irq_unmask); - if (!chip->irq_set_affinity) + if (!chip->irq_set_affinity && !(info->flags & MSI_FLAG_NO_AFFINITY)) chip->irq_set_affinity = msi_domain_set_affinity; } -- 2.43.0
