Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4ee11c1a authored by Suresh Warrier's avatar Suresh Warrier Committed by Paul Mackerras
Browse files

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: default avatarSuresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@ozlabs.org>
parent 07b1fdf5

arch/powerpc/include/asm/pnv-pci.h

+3 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 


#include <linux/pci.h>

#include <linux/pci_hotplug.h>

#include <linux/irq.h>

#include <misc/cxl-base.h>

#include <asm/opal-api.h>
@@ -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,

arch/powerpc/platforms/powernv/pci-ioda.c

+20 −4
Original line number Diff line number Diff line
@@ -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)