diff options
| author | Suresh Warrier <warrier@linux.vnet.ibm.com> | 2016-08-19 15:35:49 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@ozlabs.org> | 2016-09-09 16:17:59 +1000 |
| commit | 4ee11c1a9f7cc20026bb66ac624533310a605312 (patch) | |
| tree | a93e00dd3a4598ca60daff910a03079f188b92a4 /arch/powerpc/platforms | |
| parent | 07b1fdf5bd135d94eff2b3a6849b90c358963066 (diff) | |
| download | linux-4ee11c1a9f7cc20026bb66ac624533310a605312.tar.bz2 | |
powerpc/powernv: Provide facilities for EOI, usable from real mode
This adds a new function pnv_opal_pci_msi_eoi() which does the part of
end-of-interrupt (EOI) handling of an MSI which involves doing an
OPAL call. This function can be called in real mode. This doesn't
just export pnv_ioda2_msi_eoi() because that does a call to
icp_native_eoi(), which does not work in real mode.
This also adds a function, is_pnv_opal_msi(), which KVM can call to
check whether an interrupt is one for which we should be calling
pnv_opal_pci_msi_eoi() when we need to do an EOI.
[paulus@ozlabs.org - split out the addition of pnv_opal_pci_msi_eoi()
from Suresh's patch "KVM: PPC: Book3S HV: Handle passthrough
interrupts in guest"; added is_pnv_opal_msi(); wrote description.]
Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 24 |
1 files changed, 20 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index fd9444f9fb0c..9ce48ae55062 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -2710,15 +2710,21 @@ static void pnv_pci_ioda2_setup_dma_pe(struct pnv_phb *phb, } #ifdef CONFIG_PCI_MSI -static void pnv_ioda2_msi_eoi(struct irq_data *d) +int64_t pnv_opal_pci_msi_eoi(struct irq_chip *chip, unsigned int hw_irq) { - unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); - struct irq_chip *chip = irq_data_get_irq_chip(d); struct pnv_phb *phb = container_of(chip, struct pnv_phb, ioda.irq_chip); + + return opal_pci_msi_eoi(phb->opal_id, hw_irq); +} + +static void pnv_ioda2_msi_eoi(struct irq_data *d) +{ int64_t rc; + unsigned int hw_irq = (unsigned int)irqd_to_hwirq(d); + struct irq_chip *chip = irq_data_get_irq_chip(d); - rc = opal_pci_msi_eoi(phb->opal_id, hw_irq); + rc = pnv_opal_pci_msi_eoi(chip, hw_irq); WARN_ON_ONCE(rc); icp_native_eoi(d); @@ -2748,6 +2754,16 @@ void pnv_set_msi_irq_chip(struct pnv_phb *phb, unsigned int virq) irq_set_chip(virq, &phb->ioda.irq_chip); } +/* + * Returns true iff chip is something that we could call + * pnv_opal_pci_msi_eoi for. + */ +bool is_pnv_opal_msi(struct irq_chip *chip) +{ + return chip->irq_eoi == pnv_ioda2_msi_eoi; +} +EXPORT_SYMBOL_GPL(is_pnv_opal_msi); + static int pnv_pci_ioda_msi_setup(struct pnv_phb *phb, struct pci_dev *dev, unsigned int hwirq, unsigned int virq, unsigned int is_64, struct msi_msg *msg) |