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powerpc/pseries: Reject discontiguous/non-zero based MSI-X requests

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There's no way for us to express to firmware that we want a
discontiguous, or non-zero based, range of MSI-X entries. So we
must reject such requests.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2009-03-05 14:44:26 +00:00 committed by Benjamin Herrenschmidt
parent e7943fbbfd
commit 94afa5a5f5
1 changed files with 24 additions and 0 deletions
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24
arch/powerpc/platforms/pseries/msi.c
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@ -356,6 +356,27 @@ static int rtas_msi_check_device(struct pci_dev *pdev, int nvec, int type)
return 0;
}
static int check_msix_entries(struct pci_dev *pdev)
{
struct msi_desc *entry;
int expected;
/* There's no way for us to express to firmware that we want
* a discontiguous, or non-zero based, range of MSI-X entries.
* So we must reject such requests. */
expected = 0;
list_for_each_entry(entry, &pdev->msi_list, list) {
if (entry->msi_attrib.entry_nr != expected) {
pr_debug("rtas_msi: bad MSI-X entries.\n");
return -EINVAL;
}
expected++;
}
return 0;
}
static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
struct pci_dn *pdn;
@ -367,6 +388,9 @@ static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
if (!pdn)
return -ENODEV;
if (type == PCI_CAP_ID_MSIX && check_msix_entries(pdev))
return -EINVAL;
/*
* Try the new more explicit firmware interface, if that fails fall
* back to the old interface. The old interface is known to never