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powerpc/pseries/pci: Introduce rtas_prepare_msi_irqs()

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This splits the routine setting the MSIs in two parts: allocation of
MSIs for the PCI device at the FW level (RTAS) and the actual mapping
and activation of the IRQs.

rtas_prepare_msi_irqs() will serve as a handler for the PCI MSI domain.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210701132750.1475580-3-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2021-07-01 15:27:20 +02:00 committed by Michael Ellerman
parent 786e5b102a
commit e812020073
1 changed files with 19 additions and 4 deletions
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23
arch/powerpc/platforms/pseries/msi.c
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@ -373,12 +373,11 @@ static void rtas_hack_32bit_msi_gen2(struct pci_dev *pdev)
pci_write_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_HI, 0);
}
static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type)
static int rtas_prepare_msi_irqs(struct pci_dev *pdev, int nvec_in, int type,
msi_alloc_info_t *arg)
{
struct pci_dn *pdn;
int hwirq, virq, i, quota, rc;
struct msi_desc *entry;
struct msi_msg msg;
int quota, rc;
int nvec = nvec_in;
int use_32bit_msi_hack = 0;
@ -456,6 +455,22 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type)
return rc;
}
return 0;
}
static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec_in, int type)
{
struct pci_dn *pdn;
int hwirq, virq, i;
int rc;
struct msi_desc *entry;
struct msi_msg msg;
rc = rtas_prepare_msi_irqs(pdev, nvec_in, type, NULL);
if (rc)
return rc;
pdn = pci_get_pdn(pdev);
i = 0;
for_each_pci_msi_entry(entry, pdev) {
hwirq = rtas_query_irq_number(pdn, i++);