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| author | K. Y. Srinivasan <kys@microsoft.com> | 2017-03-24 18:07:21 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-05-25 13:44:47 (GMT) |
| commit | 87e7dc97c8a0544553aacf8705c6772db55f6691 (patch) | |
| tree | 18cee943389a43c0a41187fc4ecbbd2d5f06cc55 | |
| parent | d1d63f97dd76f7d90f801bcc9a6334d5df96367a (diff) | |
| download | linux-87e7dc97c8a0544553aacf8705c6772db55f6691.tar.xz | |
PCI: hv: Specify CPU_AFFINITY_ALL for MSI affinity when >= 32 CPUs
commit 433fcf6b7b31f1f233dd50aeb9d066a0f6ed4b9d upstream.
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 <kys@microsoft.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Long Li <longli@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/pci/host/pci-hyperv.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/pci/host/pci-hyperv.c b/drivers/pci/host/pci-hyperv.c index ddabf7b..dafb4cd 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) @@ -889,9 +890,13 @@ 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, |