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PCI/MSI: Split out irqdomain code 

Move the irqdomain specific code into its own file.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/20211206210224.817754783@linutronix.de
This commit is contained in:
Thomas Gleixner 2021-12-06 23:27:52 +01:00
parent a01e09ef12
commit aa423ac422
6 changed files with 340 additions and 322 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/pci/msi/Makefile
View File

@ -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

279
drivers/pci/msi/irqdomain.c Normal file
View File

@ -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;
}

13
drivers/pci/msi/legacy.c
View File

@ -4,8 +4,7 @@
*
* Legacy architecture specific setup and teardown mechanism.
*/
#include <linux/msi.h>
#include <linux/pci.h>
#include "msi.h"
/* Arch hooks */
int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
@ -50,3 +49,13 @@ void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
}
}
}
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);
}

319
drivers/pci/msi/msi.c
View File

@ -6,64 +6,16 @@
* Copyright (C) Tom Long Nguyen (tom.l.nguyen@intel.com)
* 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 *dev)
}
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)
{
@ -1195,253 +1130,19 @@ struct pci_dev *msi_desc_to_pci_dev(struct msi_desc *desc)
}
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)
void pci_no_msi(void)
{
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_enable = 0;
}
/**
* pci_msi_domain_calc_hwirq - Generate a unique ID for an MSI source
* @desc: Pointer to the MSI descriptor
* pci_msi_enabled - is MSI enabled?
*
* The ID number is only used within the irqdomain.
*/
static irq_hw_number_t pci_msi_domain_calc_hwirq(struct msi_desc *desc)
* Returns true if MSI has not been disabled by the command-line option
* pci=nomsi.
**/
int pci_msi_enabled(void)
{
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;
return pci_msi_enable;
}
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;
}
#endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
EXPORT_SYMBOL(pci_msi_enabled);

39
drivers/pci/msi/msi.h Normal file
View File

@ -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;
}

11
include/linux/msi.h
View File

@ -259,17 +259,6 @@ int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc);
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
/*