two small PCI MSI cleanups V2

two small PCI MSI cleanups V2

[Christoph Hellwig]

Now with even more dead code removal thanks to the review from Thomas!

[PATCH 1/2] PCI/msi: remove unused default PCI IRQ domain code

[Christoph Hellwig]

pci_msi_create_default_irq_domain is never called in the whole tree, so
remove it as well as all the supporting code for a default PCI MSI domain.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/pci/msi.c   | 50 ++------------------------------------------------
 include/linux/msi.h |  3 ---
 2 files changed, 2 insertions(+), 51 deletions(-)

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 50c5003295ca..9de17f17a5d2 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -32,30 +32,11 @@ int pci_msi_ignore_mask;
 #define msix_table_size(flags)	((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
 
 #ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
-static struct irq_domain *pci_msi_default_domain;
-static DEFINE_MUTEX(pci_msi_domain_lock);
-
-struct irq_domain * __weak arch_get_pci_msi_domain(struct pci_dev *dev)
-{
-	return pci_msi_default_domain;
-}
-
-static struct irq_domain *pci_msi_get_domain(struct pci_dev *dev)
-{
-	struct irq_domain *domain;
-
-	domain = dev_get_msi_domain(&dev->dev);
-	if (domain)
-		return domain;
-
-	return arch_get_pci_msi_domain(dev);
-}
-
 static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 {
 	struct irq_domain *domain;
 
-	domain = pci_msi_get_domain(dev);
+	domain = dev_get_msi_domain(&dev->dev);
 	if (domain && irq_domain_is_hierarchy(domain))
 		return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
 
@@ -66,7 +47,7 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
 {
 	struct irq_domain *domain;
 
-	domain = pci_msi_get_domain(dev);
+	domain = dev_get_msi_domain(&dev->dev);
 	if (domain && irq_domain_is_hierarchy(domain))
 		pci_msi_domain_free_irqs(domain, dev);
 	else
@@ -1507,33 +1488,6 @@ void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev)
 	msi_domain_free_irqs(domain, &dev->dev);
 }
 
-/**
- * pci_msi_create_default_irq_domain - Create a default MSI interrupt domain
- * @fwnode:	Optional fwnode of the interrupt controller
- * @info:	MSI domain info
- * @parent:	Parent irq domain
- *
- * Returns: A domain pointer or NULL in case of failure. If successful
- * the default PCI/MSI irqdomain pointer is updated.
- */
-struct irq_domain *pci_msi_create_default_irq_domain(struct fwnode_handle *fwnode,
-		struct msi_domain_info *info, struct irq_domain *parent)
-{
-	struct irq_domain *domain;
-
-	mutex_lock(&pci_msi_domain_lock);
-	if (pci_msi_default_domain) {
-		pr_err("PCI: default irq domain for PCI MSI has already been created.\n");
-		domain = NULL;
-	} else {
-		domain = pci_msi_create_irq_domain(fwnode, info, parent);
-		pci_msi_default_domain = domain;
-	}
-	mutex_unlock(&pci_msi_domain_lock);
-
-	return domain;
-}
-
 static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
 {
 	u32 *pa = data;
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 0db320b7bb15..18b8566b3ce3 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -319,9 +319,6 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
 			      int nvec, int type);
 void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev);
-struct irq_domain *pci_msi_create_default_irq_domain(struct fwnode_handle *fwnode,
-		 struct msi_domain_info *info, struct irq_domain *parent);
-
 irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
 					  struct msi_desc *desc);
 int pci_msi_domain_check_cap(struct irq_domain *domain,
-- 
2.11.0

[PATCH 2/2] PCI/msi: remove pci_msi_domain_{alloc,free}_irqs

[Christoph Hellwig]

Just call the msi_* version directly instead of having trivial wrappers
for one or two callsites.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/kernel/apic/msi.c |  2 +-
 drivers/pci/msi.c          | 30 ++----------------------------
 include/linux/msi.h        |  3 ---
 3 files changed, 3 insertions(+), 32 deletions(-)

diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 015bbf30e3e3..c61aec7e65f4 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -82,7 +82,7 @@ int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 	if (domain == NULL)
 		return -ENOSYS;
 
-	return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
+	return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
 }
 
 void native_teardown_msi_irq(unsigned int irq)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 9de17f17a5d2..3f65efe02cc2 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -38,7 +38,7 @@ static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 
 	domain = dev_get_msi_domain(&dev->dev);
 	if (domain && irq_domain_is_hierarchy(domain))
-		return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
+		return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
 
 	return arch_setup_msi_irqs(dev, nvec, type);
 }
@@ -49,7 +49,7 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
 
 	domain = dev_get_msi_domain(&dev->dev);
 	if (domain && irq_domain_is_hierarchy(domain))
-		pci_msi_domain_free_irqs(domain, dev);
+		msi_domain_free_irqs(domain, &dev->dev);
 	else
 		arch_teardown_msi_irqs(dev);
 }
@@ -1462,32 +1462,6 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 }
 EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
 
-/**
- * pci_msi_domain_alloc_irqs - Allocate interrupts for @dev in @domain
- * @domain:	The interrupt domain to allocate from
- * @dev:	The device for which to allocate
- * @nvec:	The number of interrupts to allocate
- * @type:	Unused to allow simpler migration from the arch_XXX interfaces
- *
- * Returns:
- * A virtual interrupt number or an error code in case of failure
- */
-int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
-			      int nvec, int type)
-{
-	return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
-}
-
-/**
- * pci_msi_domain_free_irqs - Free interrupts for @dev in @domain
- * @domain:	The interrupt domain
- * @dev:	The device for which to free interrupts
- */
-void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev)
-{
-	msi_domain_free_irqs(domain, &dev->dev);
-}
-
 static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
 {
 	u32 *pa = data;
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 18b8566b3ce3..1b6f3ebbe876 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -316,9 +316,6 @@ void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
 struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 					     struct msi_domain_info *info,
 					     struct irq_domain *parent);
-int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
-			      int nvec, int type);
-void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev);
 irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
 					  struct msi_desc *desc);
 int pci_msi_domain_check_cap(struct irq_domain *domain,
-- 
2.11.0

Re: [PATCH 1/2] PCI/msi: remove unused default PCI IRQ domain code

[Thomas Gleixner]

On Wed, 8 Feb 2017, Christoph Hellwig wrote:

> pci_msi_create_default_irq_domain is never called in the whole tree, so
> remove it as well as all the supporting code for a default PCI MSI domain.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

Re: [PATCH 2/2] PCI/msi: remove pci_msi_domain_{alloc,free}_irqs

[Thomas Gleixner]

On Wed, 8 Feb 2017, Christoph Hellwig wrote:

> Just call the msi_* version directly instead of having trivial wrappers
> for one or two callsites.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>

Re: two small PCI MSI cleanups V2

[Bjorn Helgaas]

On Wed, Feb 08, 2017 at 06:17:42PM +0100, Christoph Hellwig wrote:
> Now with even more dead code removal thanks to the review from Thomas!

Both applied with Thomas' acks to pci/msi for v4.11, thanks!

[PATCH 2/2] PCI/msi: remove pci_msi_domain_{alloc,free}_irqs

[Christoph Hellwig]

Just call the msi_* version directly instead of having trivial wrappers
for one or two callsites.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 arch/x86/kernel/apic/msi.c |  2 +-
 drivers/pci/msi.c          | 30 ++----------------------------
 include/linux/msi.h        |  3 ---
 3 files changed, 3 insertions(+), 32 deletions(-)

diff --git a/arch/x86/kernel/apic/msi.c b/arch/x86/kernel/apic/msi.c
index 015bbf30e3e3..c61aec7e65f4 100644
--- a/arch/x86/kernel/apic/msi.c
+++ b/arch/x86/kernel/apic/msi.c
@@ -82,7 +82,7 @@ int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 	if (domain == NULL)
 		return -ENOSYS;
 
-	return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
+	return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
 }
 
 void native_teardown_msi_irq(unsigned int irq)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 4f2996bd5c6a..3ba99adb8b40 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -57,7 +57,7 @@ static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
 
 	domain = pci_msi_get_domain(dev);
 	if (domain && irq_domain_is_hierarchy(domain))
-		return pci_msi_domain_alloc_irqs(domain, dev, nvec, type);
+		return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
 
 	return arch_setup_msi_irqs(dev, nvec, type);
 }
@@ -68,7 +68,7 @@ static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
 
 	domain = pci_msi_get_domain(dev);
 	if (domain && irq_domain_is_hierarchy(domain))
-		pci_msi_domain_free_irqs(domain, dev);
+		msi_domain_free_irqs(domain, &dev->dev);
 	else
 		arch_teardown_msi_irqs(dev);
 }
@@ -1481,32 +1481,6 @@ struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 }
 EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
 
-/**
- * pci_msi_domain_alloc_irqs - Allocate interrupts for @dev in @domain
- * @domain:	The interrupt domain to allocate from
- * @dev:	The device for which to allocate
- * @nvec:	The number of interrupts to allocate
- * @type:	Unused to allow simpler migration from the arch_XXX interfaces
- *
- * Returns:
- * A virtual interrupt number or an error code in case of failure
- */
-int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
-			      int nvec, int type)
-{
-	return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
-}
-
-/**
- * pci_msi_domain_free_irqs - Free interrupts for @dev in @domain
- * @domain:	The interrupt domain
- * @dev:	The device for which to free interrupts
- */
-void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev)
-{
-	msi_domain_free_irqs(domain, &dev->dev);
-}
-
 static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
 {
 	u32 *pa = data;
diff --git a/include/linux/msi.h b/include/linux/msi.h
index 18b8566b3ce3..1b6f3ebbe876 100644
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -316,9 +316,6 @@ void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg);
 struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
 					     struct msi_domain_info *info,
 					     struct irq_domain *parent);
-int pci_msi_domain_alloc_irqs(struct irq_domain *domain, struct pci_dev *dev,
-			      int nvec, int type);
-void pci_msi_domain_free_irqs(struct irq_domain *domain, struct pci_dev *dev);
 irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
 					  struct msi_desc *desc);
 int pci_msi_domain_check_cap(struct irq_domain *domain,
-- 
2.11.0