From 4ee11c1a9f7cc20026bb66ac624533310a605312 Mon Sep 17 00:00:00 2001 From: Suresh Warrier Date: Fri, 19 Aug 2016 15:35:49 +1000 Subject: [PATCH] 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 Signed-off-by: Paul Mackerras --- arch/powerpc/include/asm/pnv-pci.h | 3 +++ arch/powerpc/platforms/powernv/pci-ioda.c | 24 +++++++++++++++++++---- 2 files changed, 23 insertions(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/pnv-pci.h b/arch/powerpc/include/asm/pnv-pci.h index 0cbd8134ce81..1b46b52d3212 100644 --- a/arch/powerpc/include/asm/pnv-pci.h +++ b/arch/powerpc/include/asm/pnv-pci.h @@ -12,6 +12,7 @@ #include #include +#include #include #include @@ -33,6 +34,8 @@ int pnv_cxl_alloc_hwirqs(struct pci_dev *dev, int num); void pnv_cxl_release_hwirqs(struct pci_dev *dev, int hwirq, int num); int pnv_cxl_get_irq_count(struct pci_dev *dev); struct device_node *pnv_pci_get_phb_node(struct pci_dev *dev); +int64_t pnv_opal_pci_msi_eoi(struct irq_chip *chip, unsigned int hw_irq); +bool is_pnv_opal_msi(struct irq_chip *chip); #ifdef CONFIG_CXL_BASE int pnv_cxl_alloc_hwirq_ranges(struct cxl_irq_ranges *irqs, 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) -- 2.45.2