[patch 18/22] PCI/MSI: Split out irqdomain code

From: Thomas Gleixner
Date: Fri Nov 26 2021 - 20:22:50 EST

Move the irqdomain specific code into it's own file.

Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
drivers/pci/msi/Makefile | 1
drivers/pci/msi/irqdomain.c | 279 ++++++++++++++++++++++++++++++++++++++
drivers/pci/msi/legacy.c | 10 +
drivers/pci/msi/msi.c | 319 +-------------------------------------------
drivers/pci/msi/msi.h | 39 +++++
include/linux/msi.h | 11 -
6 files changed, 339 insertions(+), 320 deletions(-)

--- a/drivers/pci/msi/Makefile
+++ b/drivers/pci/msi/Makefile
@@ -3,4 +3,5 @@
# Makefile for the PCI/MSI
obj-$(CONFIG_PCI) += pcidev_msi.o
obj-$(CONFIG_PCI_MSI) += msi.o
+obj-$(CONFIG_PCI_MSI_IRQ_DOMAIN) += irqdomain.o
obj-$(CONFIG_PCI_MSI_ARCH_FALLBACKS) += legacy.o
--- /dev/null
+++ b/drivers/pci/msi/irqdomain.c
@@ -0,0 +1,279 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * PCI Message Signaled Interrupt (MSI) - irqdomain support
+ */
+#include <linux/acpi_iort.h>
+#include <linux/irqdomain.h>
+#include <linux/of_irq.h>
+
+#include "msi.h"
+
+int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+ struct irq_domain *domain;
+
+ domain = dev_get_msi_domain(&dev->dev);
+ if (domain && irq_domain_is_hierarchy(domain))
+ return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
+
+ return pci_msi_legacy_setup_msi_irqs(dev, nvec, type);
+}
+
+void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
+{
+ struct irq_domain *domain;
+
+ domain = dev_get_msi_domain(&dev->dev);
+ if (domain && irq_domain_is_hierarchy(domain))
+ msi_domain_free_irqs(domain, &dev->dev);
+ else
+ pci_msi_legacy_teardown_msi_irqs(dev);
+}
+
+/**
+ * pci_msi_domain_write_msg - Helper to write MSI message to PCI config space
+ * @irq_data: Pointer to interrupt data of the MSI interrupt
+ * @msg: Pointer to the message
+ */
+static void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg)
+{
+ struct msi_desc *desc = irq_data_get_msi_desc(irq_data);
+
+ /*
+ * For MSI-X desc->irq is always equal to irq_data->irq. For
+ * MSI only the first interrupt of MULTI MSI passes the test.
+ */
+ if (desc->irq == irq_data->irq)
+ __pci_write_msi_msg(desc, msg);
+}
+
+/**
+ * pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source
+ * @desc: Pointer to the MSI descriptor
+ *
+ * The ID number is only used within the irqdomain.
+ */
+static irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc)
+{
+ struct pci_dev *dev = msi_desc_to_pci_dev(desc);
+
+ return (irq_hw_number_t)desc->pci.msi_attrib.entry_nr |
+ pci_dev_id(dev) << 11 |
+ (pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
+}
+
+static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc)
+{
+ return !desc->pci.msi_attrib.is_msix && desc->nvec_used > 1;
+}
+
+/**
+ * pci_msi_domain_check_cap - Verify that @domain supports the capabilities
+ * for @dev
+ * @domain: The interrupt domain to check
+ * @info: The domain info for verification
+ * @dev: The device to check
+ *
+ * Returns:
+ * 0 if the functionality is supported
+ * 1 if Multi MSI is requested, but the domain does not support it
+ * -ENOTSUPP otherwise
+ */
+int pci_msi_domain_check_cap(struct irq_domain *domain,
+ struct msi_domain_info *info, struct device *dev)
+{
+ struct msi_desc *desc = first_pci_msi_entry(to_pci_dev(dev));
+
+ /* 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;
+ else if (desc->pci.msi_attrib.is_msix && !(info->flags & MSI_FLAG_PCI_MSIX))
+ return -ENOTSUPP;
+
+ return 0;
+}
+
+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() */
+ if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC)
+ return 1;
+
+ return error;
+}
+
+static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
+ struct msi_desc *desc)
+{
+ arg->desc = desc;
+ arg->hwirq = pci_msi_domain_calc_hwirq(desc);
+}
+
+static struct msi_domain_ops pci_msi_domain_ops_default = {
+ .set_desc = pci_msi_domain_set_desc,
+ .msi_check = pci_msi_domain_check_cap,
+ .handle_error = pci_msi_domain_handle_error,
+};
+
+static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
+{
+ struct msi_domain_ops *ops = info->ops;
+
+ if (ops == NULL) {
+ info->ops = &pci_msi_domain_ops_default;
+ } else {
+ if (ops->set_desc == NULL)
+ ops->set_desc = pci_msi_domain_set_desc;
+ if (ops->msi_check == NULL)
+ ops->msi_check = pci_msi_domain_check_cap;
+ if (ops->handle_error == NULL)
+ ops->handle_error = pci_msi_domain_handle_error;
+ }
+}
+
+static void pci_msi_domain_update_chip_ops(struct msi_domain_info *info)
+{
+ struct irq_chip *chip = info->chip;
+
+ BUG_ON(!chip);
+ if (!chip->irq_write_msi_msg)
+ chip->irq_write_msi_msg = pci_msi_domain_write_msg;
+ if (!chip->irq_mask)
+ chip->irq_mask = pci_msi_mask_irq;
+ if (!chip->irq_unmask)
+ chip->irq_unmask = pci_msi_unmask_irq;
+}
+
+/**
+ * pci_msi_create_irq_domain - Create a MSI interrupt domain
+ * @fwnode: Optional fwnode of the interrupt controller
+ * @info: MSI domain info
+ * @parent: Parent irq domain
+ *
+ * Updates the domain and chip ops and creates a MSI interrupt domain.
+ *
+ * Returns:
+ * A domain pointer or NULL in case of failure.
+ */
+struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
+ struct msi_domain_info *info,
+ struct irq_domain *parent)
+{
+ 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)
+ pci_msi_domain_update_chip_ops(info);
+
+ info->flags |= MSI_FLAG_ACTIVATE_EARLY;
+ if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION_MODE))
+ info->flags |= MSI_FLAG_MUST_REACTIVATE;
+
+ /* PCI-MSI is oneshot-safe */
+ info->chip->flags |= IRQCHIP_ONESHOT_SAFE;
+
+ domain = msi_create_irq_domain(fwnode, info, parent);
+ if (!domain)
+ return NULL;
+
+ irq_domain_update_bus_token(domain, DOMAIN_BUS_PCI_MSI);
+ return domain;
+}
+EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
+
+/*
+ * Users of the generic MSI infrastructure expect a device to have a single ID,
+ * so with DMA aliases we have to pick the least-worst compromise. Devices with
+ * DMA phantom functions tend to still emit MSIs from the real function number,
+ * so we ignore those and only consider topological aliases where either the
+ * alias device or RID appears on a different bus number. We also make the
+ * reasonable assumption that bridges are walked in an upstream direction (so
+ * the last one seen wins), and the much braver assumption that the most likely
+ * case is that of PCI->PCIe so we should always use the alias RID. This echoes
+ * the logic from intel_irq_remapping's set_msi_sid(), which presumably works
+ * well enough in practice; in the face of the horrible PCIe<->PCI-X conditions
+ * for taking ownership all we can really do is close our eyes and hope...
+ */
+static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
+{
+ u32 *pa = data;
+ u8 bus = PCI_BUS_NUM(*pa);
+
+ if (pdev->bus->number != bus || PCI_BUS_NUM(alias) != bus)
+ *pa = alias;
+
+ return 0;
+}
+
+/**
+ * pci_msi_domain_get_msi_rid - Get the MSI requester id (RID)
+ * @domain: The interrupt domain
+ * @pdev: The PCI device.
+ *
+ * The RID for a device is formed from the alias, with a firmware
+ * supplied mapping applied
+ *
+ * Returns: The RID.
+ */
+u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
+{
+ struct device_node *of_node;
+ u32 rid = pci_dev_id(pdev);
+
+ pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
+
+ of_node = irq_domain_get_of_node(domain);
+ rid = of_node ? of_msi_map_id(&pdev->dev, of_node, rid) :
+ iort_msi_map_id(&pdev->dev, rid);
+
+ return rid;
+}
+
+/**
+ * pci_msi_get_device_domain - Get the MSI domain for a given PCI device
+ * @pdev: The PCI device
+ *
+ * Use the firmware data to find a device-specific MSI domain
+ * (i.e. not one that is set as a default).
+ *
+ * Returns: The corresponding MSI domain or NULL if none has been found.
+ */
+struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
+{
+ struct irq_domain *dom;
+ u32 rid = pci_dev_id(pdev);
+
+ pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
+ dom = of_msi_map_get_device_domain(&pdev->dev, rid, DOMAIN_BUS_PCI_MSI);
+ if (!dom)
+ dom = iort_get_device_domain(&pdev->dev, rid,
+ DOMAIN_BUS_PCI_MSI);
+ return dom;
+}
+
+/**
+ * pci_dev_has_special_msi_domain - Check whether the device is handled by
+ * a non-standard PCI-MSI domain
+ * @pdev: The PCI device to check.
+ *
+ * Returns: True if the device irqdomain or the bus irqdomain is
+ * non-standard PCI/MSI.
+ */
+bool pci_dev_has_special_msi_domain(struct pci_dev *pdev)
+{
+ struct irq_domain *dom = dev_get_msi_domain(&pdev->dev);
+
+ if (!dom)
+ dom = dev_get_msi_domain(&pdev->bus->dev);
+
+ if (!dom)
+ return true;
+
+ return dom->bus_token != DOMAIN_BUS_PCI_MSI;
+}
--- a/drivers/pci/msi/legacy.c
+++ b/drivers/pci/msi/legacy.c
@@ -50,3 +50,13 @@ void __weak arch_teardown_msi_irqs(struc
}
}
}
+
+int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+ return arch_setup_msi_irqs(dev, nvec, type);
+}
+
+void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev)
+{
+ arch_teardown_msi_irqs(dev);
+}
--- a/drivers/pci/msi/msi.c
+++ b/drivers/pci/msi/msi.c
@@ -6,64 +6,16 @@
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@xxxxxxxxx)
* Copyright (C) 2016 Christoph Hellwig.
*/
-
-#include <linux/acpi_iort.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/irq.h>
-#include <linux/irqdomain.h>
-#include <linux/msi.h>
-#include <linux/of_irq.h>
-#include <linux/pci.h>

#include "../pci.h"
+#include "msi.h"

static int pci_msi_enable = 1;
int pci_msi_ignore_mask;

-#define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
-
-#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
-static int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
-{
- struct irq_domain *domain;
-
- domain = dev_get_msi_domain(&dev->dev);
- if (domain && irq_domain_is_hierarchy(domain))
- return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
-
- return arch_setup_msi_irqs(dev, nvec, type);
-}
-
-static void pci_msi_teardown_msi_irqs(struct pci_dev *dev)
-{
- struct irq_domain *domain;
-
- domain = dev_get_msi_domain(&dev->dev);
- if (domain && irq_domain_is_hierarchy(domain))
- msi_domain_free_irqs(domain, &dev->dev);
- else
- arch_teardown_msi_irqs(dev);
-}
-#else
-#define pci_msi_setup_msi_irqs arch_setup_msi_irqs
-#define pci_msi_teardown_msi_irqs arch_teardown_msi_irqs
-#endif
-
-/*
- * PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to
- * mask all MSI interrupts by clearing the MSI enable bit does not work
- * reliably as devices without an INTx disable bit will then generate a
- * level IRQ which will never be cleared.
- */
-static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
-{
- /* Don't shift by >= width of type */
- if (desc->pci.msi_attrib.multi_cap >= 5)
- return 0xffffffff;
- return (1 << (1 << desc->pci.msi_attrib.multi_cap)) - 1;
-}
-
static noinline void pci_msi_update_mask(struct msi_desc *desc, u32 clear, u32 set)
{
raw_spinlock_t *lock = &desc->dev->msi_lock;
@@ -903,23 +855,6 @@ void pci_disable_msix(struct pci_dev *de
}
EXPORT_SYMBOL(pci_disable_msix);

-void pci_no_msi(void)
-{
- pci_msi_enable = 0;
-}
-
-/**
- * pci_msi_enabled - is MSI enabled?
- *
- * Returns true if MSI has not been disabled by the command-line option
- * pci=nomsi.
- **/
-int pci_msi_enabled(void)
-{
- return pci_msi_enable;
-}
-EXPORT_SYMBOL(pci_msi_enabled);
-
static int __pci_enable_msi_range(struct pci_dev *dev, int minvec, int maxvec,
struct irq_affinity *affd)
{
@@ -1181,253 +1116,19 @@ struct pci_dev *msi_desc_to_pci_dev(stru
}
EXPORT_SYMBOL(msi_desc_to_pci_dev);

-#ifdef CONFIG_PCI_MSI_IRQ_DOMAIN
-/**
- * pci_msi_domain_write_msg - Helper to write MSI message to PCI config space
- * @irq_data: Pointer to interrupt data of the MSI interrupt
- * @msg: Pointer to the message
- */
-static void pci_msi_domain_write_msg(struct irq_data *irq_data, struct msi_msg *msg)
-{
- struct msi_desc *desc = irq_data_get_msi_desc(irq_data);
-
- /*
- * For MSI-X desc->irq is always equal to irq_data->irq. For
- * MSI only the first interrupt of MULTI MSI passes the test.
- */
- if (desc->irq == irq_data->irq)
- __pci_write_msi_msg(desc, msg);
-}
-
-/**
- * pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source
- * @desc: Pointer to the MSI descriptor
- *
- * The ID number is only used within the irqdomain.
- */
-static irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc)
-{
- struct pci_dev *dev = msi_desc_to_pci_dev(desc);
-
- return (irq_hw_number_t)desc->pci.msi_attrib.entry_nr |
- pci_dev_id(dev) << 11 |
- (pci_domain_nr(dev->bus) & 0xFFFFFFFF) << 27;
-}
-
-static inline bool pci_msi_desc_is_multi_msi(struct msi_desc *desc)
-{
- return !desc->pci.msi_attrib.is_msix && desc->nvec_used > 1;
-}
-
-/**
- * pci_msi_domain_check_cap - Verify that @domain supports the capabilities
- * for @dev
- * @domain: The interrupt domain to check
- * @info: The domain info for verification
- * @dev: The device to check
- *
- * Returns:
- * 0 if the functionality is supported
- * 1 if Multi MSI is requested, but the domain does not support it
- * -ENOTSUPP otherwise
- */
-int pci_msi_domain_check_cap(struct irq_domain *domain,
- struct msi_domain_info *info, struct device *dev)
-{
- struct msi_desc *desc = first_pci_msi_entry(to_pci_dev(dev));
-
- /* 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;
- else if (desc->pci.msi_attrib.is_msix && !(info->flags & MSI_FLAG_PCI_MSIX))
- return -ENOTSUPP;
-
- return 0;
-}
-
-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() */
- if (pci_msi_desc_is_multi_msi(desc) && error == -ENOSPC)
- return 1;
-
- return error;
-}
-
-static void pci_msi_domain_set_desc(msi_alloc_info_t *arg,
- struct msi_desc *desc)
-{
- arg->desc = desc;
- arg->hwirq = pci_msi_domain_calc_hwirq(desc);
-}
-
-static struct msi_domain_ops pci_msi_domain_ops_default = {
- .set_desc = pci_msi_domain_set_desc,
- .msi_check = pci_msi_domain_check_cap,
- .handle_error = pci_msi_domain_handle_error,
-};
-
-static void pci_msi_domain_update_dom_ops(struct msi_domain_info *info)
-{
- struct msi_domain_ops *ops = info->ops;
-
- if (ops == NULL) {
- info->ops = &pci_msi_domain_ops_default;
- } else {
- if (ops->set_desc == NULL)
- ops->set_desc = pci_msi_domain_set_desc;
- if (ops->msi_check == NULL)
- ops->msi_check = pci_msi_domain_check_cap;
- if (ops->handle_error == NULL)
- ops->handle_error = pci_msi_domain_handle_error;
- }
-}
-
-static void pci_msi_domain_update_chip_ops(struct msi_domain_info *info)
-{
- struct irq_chip *chip = info->chip;
-
- BUG_ON(!chip);
- if (!chip->irq_write_msi_msg)
- chip->irq_write_msi_msg = pci_msi_domain_write_msg;
- if (!chip->irq_mask)
- chip->irq_mask = pci_msi_mask_irq;
- if (!chip->irq_unmask)
- chip->irq_unmask = pci_msi_unmask_irq;
-}
-
-/**
- * pci_msi_create_irq_domain - Create a MSI interrupt domain
- * @fwnode: Optional fwnode of the interrupt controller
- * @info: MSI domain info
- * @parent: Parent irq domain
- *
- * Updates the domain and chip ops and creates a MSI interrupt domain.
- *
- * Returns:
- * A domain pointer or NULL in case of failure.
- */
-struct irq_domain *pci_msi_create_irq_domain(struct fwnode_handle *fwnode,
- struct msi_domain_info *info,
- struct irq_domain *parent)
-{
- 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)
- pci_msi_domain_update_chip_ops(info);
-
- info->flags |= MSI_FLAG_ACTIVATE_EARLY;
- if (IS_ENABLED(CONFIG_GENERIC_IRQ_RESERVATION_MODE))
- info->flags |= MSI_FLAG_MUST_REACTIVATE;
-
- /* PCI-MSI is oneshot-safe */
- info->chip->flags |= IRQCHIP_ONESHOT_SAFE;
-
- domain = msi_create_irq_domain(fwnode, info, parent);
- if (!domain)
- return NULL;
-
- irq_domain_update_bus_token(domain, DOMAIN_BUS_PCI_MSI);
- return domain;
-}
-EXPORT_SYMBOL_GPL(pci_msi_create_irq_domain);
-
-/*
- * Users of the generic MSI infrastructure expect a device to have a single ID,
- * so with DMA aliases we have to pick the least-worst compromise. Devices with
- * DMA phantom functions tend to still emit MSIs from the real function number,
- * so we ignore those and only consider topological aliases where either the
- * alias device or RID appears on a different bus number. We also make the
- * reasonable assumption that bridges are walked in an upstream direction (so
- * the last one seen wins), and the much braver assumption that the most likely
- * case is that of PCI->PCIe so we should always use the alias RID. This echoes
- * the logic from intel_irq_remapping's set_msi_sid(), which presumably works
- * well enough in practice; in the face of the horrible PCIe<->PCI-X conditions
- * for taking ownership all we can really do is close our eyes and hope...
- */
-static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
-{
- u32 *pa = data;
- u8 bus = PCI_BUS_NUM(*pa);
-
- if (pdev->bus->number != bus || PCI_BUS_NUM(alias) != bus)
- *pa = alias;
-
- return 0;
-}
-
-/**
- * pci_msi_domain_get_msi_rid - Get the MSI requester id (RID)
- * @domain: The interrupt domain
- * @pdev: The PCI device.
- *
- * The RID for a device is formed from the alias, with a firmware
- * supplied mapping applied
- *
- * Returns: The RID.
- */
-u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
-{
- struct device_node *of_node;
- u32 rid = pci_dev_id(pdev);
-
- pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
-
- of_node = irq_domain_get_of_node(domain);
- rid = of_node ? of_msi_map_id(&pdev->dev, of_node, rid) :
- iort_msi_map_id(&pdev->dev, rid);
-
- return rid;
-}
-
-/**
- * pci_msi_get_device_domain - Get the MSI domain for a given PCI device
- * @pdev: The PCI device
- *
- * Use the firmware data to find a device-specific MSI domain
- * (i.e. not one that is set as a default).
- *
- * Returns: The corresponding MSI domain or NULL if none has been found.
- */
-struct irq_domain *pci_msi_get_device_domain(struct pci_dev *pdev)
+void pci_no_msi(void)
{
- struct irq_domain *dom;
- u32 rid = pci_dev_id(pdev);
-
- pci_for_each_dma_alias(pdev, get_msi_id_cb, &rid);
- dom = of_msi_map_get_device_domain(&pdev->dev, rid, DOMAIN_BUS_PCI_MSI);
- if (!dom)
- dom = iort_get_device_domain(&pdev->dev, rid,
- DOMAIN_BUS_PCI_MSI);
- return dom;
+ pci_msi_enable = 0;
}

/**
- * pci_dev_has_special_msi_domain - Check whether the device is handled by
- * a non-standard PCI-MSI domain
- * @pdev: The PCI device to check.
+ * pci_msi_enabled - is MSI enabled?
*
- * Returns: True if the device irqdomain or the bus irqdomain is
- * non-standard PCI/MSI.
- */
-bool pci_dev_has_special_msi_domain(struct pci_dev *pdev)
+ * Returns true if MSI has not been disabled by the command-line option
+ * pci=nomsi.
+ **/
+int pci_msi_enabled(void)
{
- struct irq_domain *dom = dev_get_msi_domain(&pdev->dev);
-
- if (!dom)
- dom = dev_get_msi_domain(&pdev->bus->dev);
-
- if (!dom)
- return true;
-
- return dom->bus_token != DOMAIN_BUS_PCI_MSI;
+ return pci_msi_enable;
}
-
-#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
+EXPORT_SYMBOL(pci_msi_enabled);
--- /dev/null
+++ b/drivers/pci/msi/msi.h
@@ -0,0 +1,39 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <linux/pci.h>
+#include <linux/msi.h>
+
+#define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
+
+extern int pci_msi_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
+extern void pci_msi_teardown_msi_irqs(struct pci_dev *dev);
+
+#ifdef CONFIG_PCI_MSI_ARCH_FALLBACKS
+extern int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
+extern void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev);
+#else
+static inline int pci_msi_legacy_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
+{
+ WARN_ON_ONCE(1);
+ return -ENODEV;
+}
+
+static inline void pci_msi_legacy_teardown_msi_irqs(struct pci_dev *dev)
+{
+ WARN_ON_ONCE(1);
+}
+#endif
+
+/*
+ * PCI 2.3 does not specify mask bits for each MSI interrupt. Attempting to
+ * mask all MSI interrupts by clearing the MSI enable bit does not work
+ * reliably as devices without an INTx disable bit will then generate a
+ * level IRQ which will never be cleared.
+ */
+static inline __attribute_const__ u32 msi_multi_mask(struct msi_desc *desc)
+{
+ /* Don't shift by >= width of type */
+ if (desc->pci.msi_attrib.multi_cap >= 5)
+ return 0xffffffff;
+ return (1 << (1 << desc->pci.msi_attrib.multi_cap)) - 1;
+}
--- a/include/linux/msi.h
+++ b/include/linux/msi.h
@@ -258,17 +258,6 @@ int arch_setup_msi_irq(struct pci_dev *d
void arch_teardown_msi_irq(unsigned int irq);
int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type);
void arch_teardown_msi_irqs(struct pci_dev *dev);
-#else
-static inline int arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
-{
- WARN_ON_ONCE(1);
- return -ENODEV;
-}
-
-static inline void arch_teardown_msi_irqs(struct pci_dev *dev)
-{
- WARN_ON_ONCE(1);
-}
#endif

/*