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PCI/MSI: Provide MSI_FLAG_PCI_MSI_MASK_PARENT

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Most ARM(64) PCI/MSI domains mask and unmask in the parent domain after or
before the PCI mask/unmask operation takes place. So there are more than a
dozen of the same wrapper implementation all over the place.

Don't make the same mistake with the new per device PCI/MSI domains and
provide a new MSI feature flag, which lets the domain implementation
enable this sequence in the PCI/MSI code.

Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/87ed8j34pj.ffs@tglx
This commit is contained in:
Shivamurthy Shastri 2024-06-26 21:05:12 +02:00 committed by Thomas Gleixner
parent 6dca724d61
commit 7d189c7710
2 changed files with 22 additions and 0 deletions
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20
drivers/pci/msi/irqdomain.c
View File

@ -148,17 +148,35 @@ static void pci_device_domain_set_desc(msi_alloc_info_t *arg, struct msi_desc *d
arg->hwirq = desc->msi_index;
}
static __always_inline void cond_mask_parent(struct irq_data *data)
{
struct msi_domain_info *info = data->domain->host_data;
if (unlikely(info->flags & MSI_FLAG_PCI_MSI_MASK_PARENT))
irq_chip_mask_parent(data);
}
static __always_inline void cond_unmask_parent(struct irq_data *data)
{
struct msi_domain_info *info = data->domain->host_data;
if (unlikely(info->flags & MSI_FLAG_PCI_MSI_MASK_PARENT))
irq_chip_unmask_parent(data);
}
static void pci_irq_mask_msi(struct irq_data *data)
{
struct msi_desc *desc = irq_data_get_msi_desc(data);
pci_msi_mask(desc, BIT(data->irq - desc->irq));
cond_mask_parent(data);
}
static void pci_irq_unmask_msi(struct irq_data *data)
{
struct msi_desc *desc = irq_data_get_msi_desc(data);
cond_unmask_parent(data);
pci_msi_unmask(desc, BIT(data->irq - desc->irq));
}
@ -195,10 +213,12 @@ static const struct msi_domain_template pci_msi_template = {
static void pci_irq_mask_msix(struct irq_data *data)
{
pci_msix_mask(irq_data_get_msi_desc(data));
cond_mask_parent(data);
}
static void pci_irq_unmask_msix(struct irq_data *data)
{
cond_unmask_parent(data);
pci_msix_unmask(irq_data_get_msi_desc(data));
}

2
include/linux/msi.h
View File

@ -556,6 +556,8 @@ enum {
MSI_FLAG_USE_DEV_FWNODE = (1 << 7),
/* Set parent->dev into domain->pm_dev on device domain creation */
MSI_FLAG_PARENT_PM_DEV = (1 << 8),
/* Support for parent mask/unmask */
MSI_FLAG_PCI_MSI_MASK_PARENT = (1 << 9),
/* Mask for the generic functionality */
MSI_GENERIC_FLAGS_MASK = GENMASK(15, 0),