This change is a prerequisite for the forthcoming update
of the AHCI device driver to conserve 10/16 MSIs on Intel
chipsets. The update makes use of 'nvec_mme' parameter
for pci_enable_msi_block_part() interface.
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
---
drivers/iommu/irq_remapping.c | 12 ++++++------
1 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 1a220a0..7671da3 100644
--- a/drivers/iommu/irq_remapping.c
+++ b/drivers/iommu/irq_remapping.c
@@ -49,9 +49,9 @@ static void irq_remapping_disable_io_apic(void)
disconnect_bsp_APIC(0);
}
-static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
+static int do_setup_msi_irqs(struct pci_dev *dev, int nvec, int nvec_mme)
{
- int node, ret, sub_handle, nvec_pow2, index = 0;
+ int node, ret, sub_handle, index = 0;
unsigned int irq;
struct msi_desc *msidesc;
@@ -60,18 +60,18 @@ static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
WARN_ON(msidesc->irq);
WARN_ON(msidesc->msi_attrib.multiple);
WARN_ON(msidesc->nvec_used);
+ BUG_ON(!is_power_of_2(nvec_mme));
node = dev_to_node(&dev->dev);
irq = __create_irqs(get_nr_irqs_gsi(), nvec, node);
if (irq == 0)
return -ENOSPC;
- nvec_pow2 = __roundup_pow_of_two(nvec);
msidesc->nvec_used = nvec;
- msidesc->msi_attrib.multiple = ilog2(nvec_pow2);
+ msidesc->msi_attrib.multiple = ilog2(nvec_mme);
for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
if (!sub_handle) {
- index = msi_alloc_remapped_irq(dev, irq, nvec_pow2);
+ index = msi_alloc_remapped_irq(dev, irq, nvec_mme);
if (index < 0) {
ret = index;
goto error;
@@ -145,7 +145,7 @@ static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
int nvec, int nvec_mme, int type)
{
if (type == PCI_CAP_ID_MSI)
- return do_setup_msi_irqs(dev, nvec);
+ return do_setup_msi_irqs(dev, nvec, nvec_mme);
else
return do_setup_msix_irqs(dev, nvec);
}
--
1.7.7.6
--
Regards,
Alexander Gordeev
agordeev@xxxxxxxxxx
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