From: K. Y. Srinivasan Date: Fri, 24 Mar 2017 18:07:21 +0000 (-0700) Subject: PCI: hv: Specify CPU_AFFINITY_ALL for MSI affinity when >= 32 CPUs X-Git-Tag: v4.12-rc1~65^2~17^2~2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=433fcf6b7b31f1f233dd50aeb9d066a0f6ed4b9d;p=karo-tx-linux.git PCI: hv: Specify CPU_AFFINITY_ALL for MSI affinity when >= 32 CPUs When we have 32 or more CPUs in the affinity mask, we should use a special constant to specify that to the host. Fix this issue. Signed-off-by: K. Y. Srinivasan Signed-off-by: Bjorn Helgaas Reviewed-by: Long Li Cc: --- diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c index a1b3c1957d43..8c952f694c2f 100644 --- a/drivers/pci/host/pci-hyperv.c +++ b/drivers/pci/host/pci-hyperv.c @@ -72,6 +72,7 @@ enum { PCI_PROTOCOL_VERSION_CURRENT = PCI_PROTOCOL_VERSION_1_1 }; +#define CPU_AFFINITY_ALL -1ULL #define PCI_CONFIG_MMIO_LENGTH 0x2000 #define CFG_PAGE_OFFSET 0x1000 #define CFG_PAGE_SIZE (PCI_CONFIG_MMIO_LENGTH - CFG_PAGE_OFFSET) @@ -898,9 +899,13 @@ static void hv_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) * processors because Hyper-V only supports 64 in a guest. */ affinity = irq_data_get_affinity_mask(data); - for_each_cpu_and(cpu, affinity, cpu_online_mask) { - int_pkt->int_desc.cpu_mask |= - (1ULL << vmbus_cpu_number_to_vp_number(cpu)); + if (cpumask_weight(affinity) >= 32) { + int_pkt->int_desc.cpu_mask = CPU_AFFINITY_ALL; + } else { + for_each_cpu_and(cpu, affinity, cpu_online_mask) { + int_pkt->int_desc.cpu_mask |= + (1ULL << vmbus_cpu_number_to_vp_number(cpu)); + } } ret = vmbus_sendpacket(hpdev->hbus->hdev->channel, int_pkt,