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

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 <marc.zyngier@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lkml.kernel.org/r/20180508121438.11301-3-marc.zyngier@arm.com
hifive-unleashed-5.1
Marc Zyngier 2018-05-08 13:14:31 +01:00 committed by Thomas Gleixner
parent 0be8153cbc
commit 6988e0e0d2
4 changed files with 9 additions and 0 deletions
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3
drivers/base/platform-msi.c
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)

2
drivers/bus/fsl-mc/fsl-mc-msi.c
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)

3
drivers/pci/msi.c
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)

1
include/linux/irq.h
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>