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genirq/msi: Limit level-triggered MSI to platform devices

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Nobody would be insane enough to try and use level triggered
MSIs on PCI, but let's make sure it doesn't happen. Also,
let's mandate that the irqchip backing the platform MSI domain
is providing the IRQCHIP_SUPPORTS_LEVEL_MSI flag.

Signed-off-by: Marc Zyngier <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Rob Herring <[email protected]>
Cc: Jason Cooper <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Srinivas Kandagatla <[email protected]>
Cc: Thomas Petazzoni <[email protected]>
Cc: Miquel Raynal <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
This commit is contained in:
Marc Zyngier authored and Thomas Gleixner committed 2018-05-13 15:58:59 +02:00
1 parent 0be8153cbc
commit 6988e0e0d2
4 files changed
+9
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drivers/base/platform-msi.c
+3
View File
@@ -101,6 +101,9 @@ static void platform_msi_update_chip_ops(struct msi_domain_info *info)
chip->irq_set_affinity = msi_domain_set_affinity;
if (!chip->irq_write_msi_msg)
chip->irq_write_msi_msg = platform_msi_write_msg;
if (WARN_ON((info->flags & MSI_FLAG_LEVEL_CAPABLE) &&
!(chip->flags & IRQCHIP_SUPPORTS_LEVEL_MSI)))
info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
}
static void platform_msi_free_descs(struct device *dev, int base, int nvec)
drivers/bus/fsl-mc/fsl-mc-msi.c
+2
View File
@@ -163,6 +163,8 @@ struct irq_domain *fsl_mc_msi_create_irq_domain(struct fwnode_handle *fwnode,
{
struct irq_domain *domain;
if (WARN_ON((info->flags & MSI_FLAG_LEVEL_CAPABLE)))
info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
fsl_mc_msi_update_dom_ops(info);
if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
drivers/pci/msi.c
+3
View File
@@ -1434,6 +1434,9 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
{
struct irq_domain *domain;
if (WARN_ON(info->flags & MSI_FLAG_LEVEL_CAPABLE))
info->flags &= ~MSI_FLAG_LEVEL_CAPABLE;
if (info->flags & MSI_FLAG_USE_DEF_DOM_OPS)
pci_msi_domain_update_dom_ops(info);
if (info->flags & MSI_FLAG_USE_DEF_CHIP_OPS)
include/linux/irq.h
+1
View File
@@ -512,6 +512,7 @@ enum {
IRQCHIP_SKIP_SET_WAKE = (1 << 4),
IRQCHIP_ONESHOT_SAFE = (1 << 5),
IRQCHIP_EOI_THREADED = (1 << 6),
IRQCHIP_SUPPORTS_LEVEL_MSI = (1 << 7),
};
#include <linux/irqdesc.h>