Merge branch 'pci/msi' into next

* pci/msi:
  PCI/MSI: Update MSI/MSI-X bits in PCIEBUS-HOWTO
  PCI/MSI: Document pci_alloc_irq_vectors(), deprecate pci_enable_msi()
  PCI/MSI: Return -ENOSPC if pci_enable_msi_range() can't get enough vectors
  PCI/portdrv: Use pci_irq_alloc_vectors()
  PCI/MSI: Check that we have a legacy interrupt line before using it
  PCI/MSI: Remove pci_msi_domain_{alloc,free}_irqs()
  PCI/MSI: Remove unused pci_msi_create_default_irq_domain()
  PCI/MSI: Return failure when msix_setup_entries() fails
  PCI/MSI: Remove pci_enable_msi_{exact,range}()
  amd-xgbe: Update PCI support to use new IRQ functions
  [media] cobalt: use pci_irq_allocate_vectors()
  PCI/MSI: Fix msi_capability_init() kernel-doc warnings

2 files changed, 69 insertions, 212 deletions

diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index 50c5003295ca..93cc268c6ff1 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -32,32 +32,13 @@ 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);
+		return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
 
 	return arch_setup_msi_irqs(dev, nvec, type);
 }
@@ -66,9 +47,9 @@ 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);
+		msi_domain_free_irqs(domain, &dev->dev);
 	else
 		arch_teardown_msi_irqs(dev);
 }
@@ -610,7 +591,7 @@ static int msi_verify_entries(struct pci_dev *dev)
  * msi_capability_init - configure device's MSI capability structure
  * @dev: pointer to the pci_dev data structure of MSI device function
  * @nvec: number of interrupts to allocate
- * @affinity: flag to indicate cpu irq affinity mask should be set
+ * @affd: description of automatic irq affinity assignments (may be %NULL)
  *
  * Setup the MSI capability structure of the device with the requested
  * number of interrupts.  A return value of zero indicates the successful
@@ -731,7 +712,7 @@ static int msix_setup_entries(struct pci_dev *dev, void __iomem *base,
 	ret = 0;
 out:
 	kfree(masks);
-	return 0;
+	return ret;
 }
 
 static void msix_program_entries(struct pci_dev *dev,
@@ -1084,7 +1065,7 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
 	if (nvec < 0)
 		return nvec;
 	if (nvec < minvec)
-		return -EINVAL;
+		return -ENOSPC;
 
 	if (nvec > maxvec)
 		nvec = maxvec;
@@ -1109,23 +1090,15 @@ static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
 	}
 }
 
-/**
- * pci_enable_msi_range - configure device's MSI capability structure
- * @dev: device to configure
- * @minvec: minimal number of interrupts to configure
- * @maxvec: maximum number of interrupts to configure
- *
- * This function tries to allocate a maximum possible number of interrupts in a
- * range between @minvec and @maxvec. It returns a negative errno if an error
- * occurs. If it succeeds, it returns the actual number of interrupts allocated
- * and updates the @dev's irq member to the lowest new interrupt number;
- * the other interrupt numbers allocated to this device are consecutive.
- **/
-int pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec)
+/* deprecated, don't use */
+int pci_enable_msi(struct pci_dev *dev)
 {
-	return __pci_enable_msi_range(dev, minvec, maxvec, NULL);
+	int rc = __pci_enable_msi_range(dev, 1, 1, NULL);
+	if (rc < 0)
+		return rc;
+	return 0;
 }
-EXPORT_SYMBOL(pci_enable_msi_range);
+EXPORT_SYMBOL(pci_enable_msi);
 
 static int __pci_enable_msix_range(struct pci_dev *dev,
 				   struct msix_entry *entries, int minvec,
@@ -1225,9 +1198,11 @@ int pci_alloc_irq_vectors_affinity(struct pci_dev *dev, unsigned int min_vecs,
 	}
 
 	/* use legacy irq if allowed */
-	if ((flags & PCI_IRQ_LEGACY) && min_vecs == 1) {
-		pci_intx(dev, 1);
-		return 1;
+	if (flags & PCI_IRQ_LEGACY) {
+		if (min_vecs == 1 && dev->irq) {
+			pci_intx(dev, 1);
+			return 1;
+		}
 	}
 
 	return vecs;
@@ -1381,7 +1356,7 @@ int pci_msi_domain_check_cap(struct irq_domain *domain,
 {
 	struct msi_desc *desc = first_pci_msi_entry(to_pci_dev(dev));
 
-	/* Special handling to support pci_enable_msi_range() */
+	/* Special handling to support __pci_enable_msi_range() */
 	if (pci_msi_desc_is_multi_msi(desc) &&
 	    !(info->flags & MSI_FLAG_MULTI_PCI_MSI))
 		return 1;
@@ -1394,7 +1369,7 @@ int pci_msi_domain_check_cap(struct irq_domain *domain,
 static int pci_msi_domain_handle_error(struct irq_domain *domain,
 				       struct msi_desc *desc, int error)
 {
-	/* Special handling to support pci_enable_msi_range() */
+	/* Special handling to support __pci_enable_msi_range() */
 	if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC)
 		return 1;
 
@@ -1481,59 +1456,6 @@ 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);
-}
-
-/**
- * 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/drivers/pci/pcie/portdrv_core.c b/drivers/pci/pcie/portdrv_core.c
index 9698289f105c..cea504f6f478 100644
--- a/drivers/pci/pcie/portdrv_core.c
+++ b/drivers/pci/pcie/portdrv_core.c
@@ -44,52 +44,16 @@ static void release_pcie_device(struct device *dev)
 }
 
 /**
- * pcie_port_msix_add_entry - add entry to given array of MSI-X entries
- * @entries: Array of MSI-X entries
- * @new_entry: Index of the entry to add to the array
- * @nr_entries: Number of entries already in the array
- *
- * Return value: Position of the added entry in the array
- */
-static int pcie_port_msix_add_entry(
-	struct msix_entry *entries, int new_entry, int nr_entries)
-{
-	int j;
-
-	for (j = 0; j < nr_entries; j++)
-		if (entries[j].entry == new_entry)
-			return j;
-
-	entries[j].entry = new_entry;
-	return j;
-}
-
-/**
  * pcie_port_enable_msix - try to set up MSI-X as interrupt mode for given port
  * @dev: PCI Express port to handle
- * @vectors: Array of interrupt vectors to populate
+ * @irqs: Array of interrupt vectors to populate
  * @mask: Bitmask of port capabilities returned by get_port_device_capability()
  *
  * Return value: 0 on success, error code on failure
  */
-static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
+static int pcie_port_enable_msix(struct pci_dev *dev, int *irqs, int mask)
 {
-	struct msix_entry *msix_entries;
-	int idx[PCIE_PORT_DEVICE_MAXSERVICES];
-	int nr_entries, status, pos, i, nvec;
-	u16 reg16;
-	u32 reg32;
-
-	nr_entries = pci_msix_vec_count(dev);
-	if (nr_entries < 0)
-		return nr_entries;
-	BUG_ON(!nr_entries);
-	if (nr_entries > PCIE_PORT_MAX_MSIX_ENTRIES)
-		nr_entries = PCIE_PORT_MAX_MSIX_ENTRIES;
-
-	msix_entries = kzalloc(sizeof(*msix_entries) * nr_entries, GFP_KERNEL);
-	if (!msix_entries)
-		return -ENOMEM;
+	int nr_entries, entry, nvec = 0;
 
 	/*
 	 * Allocate as many entries as the port wants, so that we can check
@@ -97,20 +61,13 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
 	 * equal to the number of entries this port actually uses, we'll happily
 	 * go through without any tricks.
 	 */
-	for (i = 0; i < nr_entries; i++)
-		msix_entries[i].entry = i;
-
-	status = pci_enable_msix_exact(dev, msix_entries, nr_entries);
-	if (status)
-		goto Exit;
-
-	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
-		idx[i] = -1;
-	status = -EIO;
-	nvec = 0;
+	nr_entries = pci_alloc_irq_vectors(dev, 1, PCIE_PORT_MAX_MSIX_ENTRIES,
+			PCI_IRQ_MSIX);
+	if (nr_entries < 0)
+		return nr_entries;
 
 	if (mask & (PCIE_PORT_SERVICE_PME | PCIE_PORT_SERVICE_HP)) {
-		int entry;
+		u16 reg16;
 
 		/*
 		 * The code below follows the PCI Express Base Specification 2.0
@@ -125,18 +82,16 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
 		pcie_capability_read_word(dev, PCI_EXP_FLAGS, &reg16);
 		entry = (reg16 & PCI_EXP_FLAGS_IRQ) >> 9;
 		if (entry >= nr_entries)
-			goto Error;
+			goto out_free_irqs;
 
-		i = pcie_port_msix_add_entry(msix_entries, entry, nvec);
-		if (i == nvec)
-			nvec++;
+		irqs[PCIE_PORT_SERVICE_PME_SHIFT] = pci_irq_vector(dev, entry);
+		irqs[PCIE_PORT_SERVICE_HP_SHIFT] = pci_irq_vector(dev, entry);
 
-		idx[PCIE_PORT_SERVICE_PME_SHIFT] = i;
-		idx[PCIE_PORT_SERVICE_HP_SHIFT] = i;
+		nvec = max(nvec, entry + 1);
 	}
 
 	if (mask & PCIE_PORT_SERVICE_AER) {
-		int entry;
+		u32 reg32, pos;
 
 		/*
 		 * The code below follows Section 7.10.10 of the PCI Express
@@ -151,13 +106,11 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
 		pci_read_config_dword(dev, pos + PCI_ERR_ROOT_STATUS, &reg32);
 		entry = reg32 >> 27;
 		if (entry >= nr_entries)
-			goto Error;
+			goto out_free_irqs;
 
-		i = pcie_port_msix_add_entry(msix_entries, entry, nvec);
-		if (i == nvec)
-			nvec++;
+		irqs[PCIE_PORT_SERVICE_AER_SHIFT] = pci_irq_vector(dev, entry);
 
-		idx[PCIE_PORT_SERVICE_AER_SHIFT] = i;
+		nvec = max(nvec, entry + 1);
 	}
 
 	/*
@@ -165,41 +118,39 @@ static int pcie_port_enable_msix(struct pci_dev *dev, int *vectors, int mask)
 	 * what we have.  Otherwise, the port has some extra entries not for the
 	 * services we know and we need to work around that.
 	 */
-	if (nvec == nr_entries) {
-		status = 0;
-	} else {
+	if (nvec != nr_entries) {
 		/* Drop the temporary MSI-X setup */
-		pci_disable_msix(dev);
+		pci_free_irq_vectors(dev);
 
 		/* Now allocate the MSI-X vectors for real */
-		status = pci_enable_msix_exact(dev, msix_entries, nvec);
-		if (status)
-			goto Exit;
+		nr_entries = pci_alloc_irq_vectors(dev, nvec, nvec,
+				PCI_IRQ_MSIX);
+		if (nr_entries < 0)
+			return nr_entries;
 	}
 
-	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
-		vectors[i] = idx[i] >= 0 ? msix_entries[idx[i]].vector : -1;
-
- Exit:
-	kfree(msix_entries);
-	return status;
+	return 0;
 
- Error:
-	pci_disable_msix(dev);
-	goto Exit;
+out_free_irqs:
+	pci_free_irq_vectors(dev);
+	return -EIO;
 }
 
 /**
- * init_service_irqs - initialize irqs for PCI Express port services
+ * pcie_init_service_irqs - initialize irqs for PCI Express port services
  * @dev: PCI Express port to handle
  * @irqs: Array of irqs to populate
  * @mask: Bitmask of port capabilities returned by get_port_device_capability()
  *
  * Return value: Interrupt mode associated with the port
  */
-static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
+static int pcie_init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
 {
-	int i, irq = -1;
+	unsigned flags = PCI_IRQ_LEGACY | PCI_IRQ_MSI;
+	int ret, i;
+
+	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
+		irqs[i] = -1;
 
 	/*
 	 * If MSI cannot be used for PCIe PME or hotplug, we have to use
@@ -207,41 +158,25 @@ static int init_service_irqs(struct pci_dev *dev, int *irqs, int mask)
 	 */
 	if (((mask & PCIE_PORT_SERVICE_PME) && pcie_pme_no_msi()) ||
 	    ((mask & PCIE_PORT_SERVICE_HP) && pciehp_no_msi())) {
-		if (dev->irq)
-			irq = dev->irq;
-		goto no_msi;
+		flags &= ~PCI_IRQ_MSI;
+	} else {
+		/* Try to use MSI-X if supported */
+		if (!pcie_port_enable_msix(dev, irqs, mask))
+			return 0;
 	}
 
-	/* Try to use MSI-X if supported */
-	if (!pcie_port_enable_msix(dev, irqs, mask))
-		return 0;
-
-	/*
-	 * We're not going to use MSI-X, so try MSI and fall back to INTx.
-	 * If neither MSI/MSI-X nor INTx available, try other interrupt.  On
-	 * some platforms, root port doesn't support MSI/MSI-X/INTx in RC mode.
-	 */
-	if (!pci_enable_msi(dev) || dev->irq)
-		irq = dev->irq;
+	ret = pci_alloc_irq_vectors(dev, 1, 1, flags);
+	if (ret < 0)
+		return -ENODEV;
 
- no_msi:
-	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++)
-		irqs[i] = irq;
-	irqs[PCIE_PORT_SERVICE_VC_SHIFT] = -1;
+	for (i = 0; i < PCIE_PORT_DEVICE_MAXSERVICES; i++) {
+		if (i != PCIE_PORT_SERVICE_VC_SHIFT)
+			irqs[i] = pci_irq_vector(dev, 0);
+	}
 
-	if (irq < 0)
-		return -ENODEV;
 	return 0;
 }
 
-static void cleanup_service_irqs(struct pci_dev *dev)
-{
-	if (dev->msix_enabled)
-		pci_disable_msix(dev);
-	else if (dev->msi_enabled)
-		pci_disable_msi(dev);
-}
-
 /**
  * get_port_device_capability - discover capabilities of a PCI Express port
  * @dev: PCI Express port to examine
@@ -378,7 +313,7 @@ int pcie_port_device_register(struct pci_dev *dev)
 	 * that can be used in the absence of irqs.  Allow them to determine
 	 * if that is to be used.
 	 */
-	status = init_service_irqs(dev, irqs, capabilities);
+	status = pcie_init_service_irqs(dev, irqs, capabilities);
 	if (status) {
 		capabilities &= PCIE_PORT_SERVICE_VC | PCIE_PORT_SERVICE_HP;
 		if (!capabilities)
@@ -401,7 +336,7 @@ int pcie_port_device_register(struct pci_dev *dev)
 	return 0;
 
 error_cleanup_irqs:
-	cleanup_service_irqs(dev);
+	pci_free_irq_vectors(dev);
 error_disable:
 	pci_disable_device(dev);
 	return status;
@@ -469,7 +404,7 @@ static int remove_iter(struct device *dev, void *data)
 void pcie_port_device_remove(struct pci_dev *dev)
 {
 	device_for_each_child(&dev->dev, NULL, remove_iter);
-	cleanup_service_irqs(dev);
+	pci_free_irq_vectors(dev);
 	pci_disable_device(dev);
 }