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 of
pci_enable_msi_partial() function.
Cc: x86@xxxxxxxxxx
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: linux-ide@xxxxxxxxxxxxxxx
Cc: linux-pci@xxxxxxxxxxxxxxx
Signed-off-by: Alexander Gordeev <agordeev@xxxxxxxxxx>
---
arch/x86/include/asm/pci.h | 3 ++-
arch/x86/include/asm/x86_init.h | 3 ++-
arch/x86/kernel/apic/io_apic.c | 2 +-
arch/x86/kernel/x86_init.c | 2 +-
arch/x86/pci/xen.c | 9 ++++++---
drivers/iommu/irq_remapping.c | 10 +++++-----
6 files changed, 17 insertions(+), 12 deletions(-)
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 0892ea0..24c9b92 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -96,7 +96,8 @@ extern void pci_iommu_alloc(void);
#ifdef CONFIG_PCI_MSI
/* implemented in arch/x86/kernel/apic/io_apic. */
struct msi_desc;
-int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
+int native_setup_msi_irqs(struct pci_dev *dev,
+ int nvec, int nvec_mme, int type);
void native_teardown_msi_irq(unsigned int irq);
void native_restore_msi_irqs(struct pci_dev *dev);
int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index e45e4da..0c3ecb6 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -175,7 +175,8 @@ struct msi_msg;
struct msi_desc;
struct x86_msi_ops {
- int (*setup_msi_irqs)(struct pci_dev *dev, int nvec, int type);
+ int (*setup_msi_irqs)(struct pci_dev *dev,
+ int nvec, int nvec_mme, int type);
void (*compose_msi_msg)(struct pci_dev *dev, unsigned int irq,
unsigned int dest, struct msi_msg *msg,
u8 hpet_id);
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
index 9d0a979..0c0faa4 100644
--- a/arch/x86/kernel/apic/io_apic.c
+++ b/arch/x86/kernel/apic/io_apic.c
@@ -3060,7 +3060,7 @@ int setup_msi_irq(struct pci_dev *dev, struct msi_desc *msidesc,
return 0;
}
-int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int nvec_mme, int type)
{
struct msi_desc *msidesc;
unsigned int irq;
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index b65bf95..939171a 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -123,7 +123,7 @@ struct x86_msi_ops x86_msi = {
/* MSI arch specific hooks */
int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int nvec_mme, int type)
{
- return x86_msi.setup_msi_irqs(dev, nvec, type);
+ return x86_msi.setup_msi_irqs(dev, nvec, nvec_mme, type);
}
void arch_teardown_msi_irqs(struct pci_dev *dev)
diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 905956f..72e4277 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -156,7 +156,8 @@ static int acpi_register_gsi_xen(struct device *dev, u32 gsi,
struct xen_pci_frontend_ops *xen_pci_frontend;
EXPORT_SYMBOL_GPL(xen_pci_frontend);
-static int xen_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+static int xen_setup_msi_irqs(struct pci_dev *dev,
+ int nvec, int nvec_mme, int type)
{
int irq, ret, i;
struct msi_desc *msidesc;
@@ -218,7 +219,8 @@ static void xen_msi_compose_msg(struct pci_dev *pdev, unsigned int pirq,
msg->data = XEN_PIRQ_MSI_DATA;
}
-static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+static int xen_hvm_setup_msi_irqs(struct pci_dev *dev,
+ int nvec, int nvec_mme, int type)
{
int irq, pirq;
struct msi_desc *msidesc;
@@ -266,7 +268,8 @@ error:
#ifdef CONFIG_XEN_DOM0
static bool __read_mostly pci_seg_supported = true;
-static int xen_initdom_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+static int xen_initdom_setup_msi_irqs(struct pci_dev *dev,
+ int nvec, int nvec_mme, int type)
{
int ret = 0;
struct msi_desc *msidesc;
diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
index 33c4395..6300bfd 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_pow2)
{
- int ret, sub_handle, nvec_pow2, index = 0;
+ int ret, sub_handle, index = 0;
unsigned int irq;
struct msi_desc *msidesc;
@@ -60,12 +60,12 @@ 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_pow2));
irq = irq_alloc_hwirqs(nvec, dev_to_node(&dev->dev));
if (irq == 0)
return -ENOSPC;
- nvec_pow2 = __roundup_pow_of_two(nvec);
msidesc->nvec_used = nvec;
msidesc->msi_attrib.multiple = ilog2(nvec_pow2);
for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
@@ -140,10 +140,10 @@ error:
}
static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
- int nvec, int type)
+ 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
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