[tip:irq/core] genirq/msi: Limit level-triggered MSI to platform devices

2018-05-13 Thread tip-bot for Marc Zyngier 
Commit-ID:  6988e0e0d28328467e218f59589b2770675a9ebd
Gitweb: https://git.kernel.org/tip/6988e0e0d28328467e218f59589b2770675a9ebd
Author: Marc Zyngier 
AuthorDate: Tue, 8 May 2018 13:14:31 +0100
Committer:  Thomas Gleixner 
CommitDate: Sun, 13 May 2018 15:58:59 +0200

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 
Signed-off-by: Thomas Gleixner 
Cc: Rob Herring 
Cc: Jason Cooper 
Cc: Ard Biesheuvel 
Cc: Srinivas Kandagatla 
Cc: Thomas Petazzoni 
Cc: Miquel Raynal 
Link: https://lkml.kernel.org/r/20180508121438.11301-3-marc.zyng...@arm.com

---
 drivers/base/platform-msi.c | 3 +++
 drivers/bus/fsl-mc/fsl-mc-msi.c | 2 ++
 drivers/pci/msi.c   | 3 +++
 include/linux/irq.h | 1 +
 4 files changed, 9 insertions(+)

diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c
index 8e22073aeeed..60d6cc618f1c 100644
--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -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)
diff --git a/drivers/bus/fsl-mc/fsl-mc-msi.c b/drivers/bus/fsl-mc/fsl-mc-msi.c
index ec35e255b496..8b9c66d7c4ff 100644
--- a/drivers/bus/fsl-mc/fsl-mc-msi.c
+++ b/drivers/bus/fsl-mc/fsl-mc-msi.c
@@ -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)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 30250631efe7..f45b74fcc059 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -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)
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 65916a305f3d..b2067083aa94 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -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

[tip:irq/core] genirq/msi: Limit level-triggered MSI to platform devices

2018-05-13 Thread tip-bot for Marc Zyngier 
Commit-ID:  6988e0e0d28328467e218f59589b2770675a9ebd
Gitweb: https://git.kernel.org/tip/6988e0e0d28328467e218f59589b2770675a9ebd
Author: Marc Zyngier 
AuthorDate: Tue, 8 May 2018 13:14:31 +0100
Committer:  Thomas Gleixner 
CommitDate: Sun, 13 May 2018 15:58:59 +0200

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 
Signed-off-by: Thomas Gleixner 
Cc: Rob Herring 
Cc: Jason Cooper 
Cc: Ard Biesheuvel 
Cc: Srinivas Kandagatla 
Cc: Thomas Petazzoni 
Cc: Miquel Raynal 
Link: https://lkml.kernel.org/r/20180508121438.11301-3-marc.zyng...@arm.com

---
 drivers/base/platform-msi.c | 3 +++
 drivers/bus/fsl-mc/fsl-mc-msi.c | 2 ++
 drivers/pci/msi.c   | 3 +++
 include/linux/irq.h | 1 +
 4 files changed, 9 insertions(+)

diff --git a/drivers/base/platform-msi.c b/drivers/base/platform-msi.c
index 8e22073aeeed..60d6cc618f1c 100644
--- a/drivers/base/platform-msi.c
+++ b/drivers/base/platform-msi.c
@@ -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)
diff --git a/drivers/bus/fsl-mc/fsl-mc-msi.c b/drivers/bus/fsl-mc/fsl-mc-msi.c
index ec35e255b496..8b9c66d7c4ff 100644
--- a/drivers/bus/fsl-mc/fsl-mc-msi.c
+++ b/drivers/bus/fsl-mc/fsl-mc-msi.c
@@ -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)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 30250631efe7..f45b74fcc059 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -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)
diff --git a/include/linux/irq.h b/include/linux/irq.h
index 65916a305f3d..b2067083aa94 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -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