[patch V2 26/36] powerpc/pseries/msi: Let core code check for contiguous entries

Thomas Gleixner
2021-12-06T22:41:07Z

Set the domain info flag and remove the check.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
V2: Remove it completely - Cedric
---
arch/powerpc/platforms/pseries/msi.c | 33 ++++++++-------------------------
1 file changed, 8 insertions(+), 25 deletions(-)

--- a/arch/powerpc/platforms/pseries/msi.c
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -321,27 +321,6 @@ static int msi_quota_for_device(struct p
return request;
}

-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;
- for_each_pci_msi_entry(entry, pdev) {
- if (entry->msi_index != expected) {
- pr_debug("rtas_msi: bad MSI-X entries.\n");
- return -EINVAL;
- }
- expected++;
- }
-
- return 0;
-}
-
static void rtas_hack_32bit_msi_gen2(struct pci_dev *pdev)
{
u32 addr_hi, addr_lo;
@@ -380,9 +359,6 @@ static int rtas_prepare_msi_irqs(struct
if (quota && quota < nvec)
return quota;

- if (type == PCI_CAP_ID_MSIX && check_msix_entries(pdev))
- return -EINVAL;
-
/*
* Firmware currently refuse any non power of two allocation
* so we round up if the quota will allow it.
@@ -530,9 +506,16 @@ static struct irq_chip pseries_pci_msi_i
.irq_write_msi_msg = pseries_msi_write_msg,
};

+
+/*
+ * Set MSI_FLAG_MSIX_CONTIGUOUS as there is no way to express to
+ * firmware to request a discontiguous or non-zero based range of
+ * MSI-X entries. Core code will reject such setup attempts.
+ */
static struct msi_domain_info pseries_msi_domain_info = {
.flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
- MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX),
+ MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX |
+ MSI_FLAG_MSIX_CONTIGUOUS),
.ops = &pseries_pci_msi_domain_ops,
.chip = &pseries_pci_msi_irq_chip,
};