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PCI: hv: Specify CPU_AFFINITY_ALL for MSI affinity when >= 32 CPUs

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commit 433fcf6b7b 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>
This commit is contained in:
K. Y. Srinivasan
2017-03-24 11:07:21 -07:00
committed by Greg Kroah-Hartman
parent d1d63f97dd
commit 87e7dc97c8
1 changed files with 8 additions and 3 deletions
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11
drivers/pci/host/pci-hyperv.c
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@@ -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,