> -----Original Message-----
> From: linux-pci-ow...@vger.kernel.org [mailto:linux-pci-ow...@vger.kernel.org]
> On Behalf Of Yijing Wang
> Sent: Saturday, July 26, 2014 8:39 AM
> To: linux-kernel@vger.kernel.org
> Cc: Xinwei Hu; Wuyun; Bjorn Helgaas; linux-...@vger.kernel.org;
> paul.mu...@huawei.com; James E.J. Bottomley; Marc Zyngier; linux-arm-
> ker...@lists.infradead.org; Russell King; linux-a...@vger.kernel.org; Basu
> Arnab-B45036; virtualizat...@lists.linux-foundation.org; Hanjun Guo; Yijing
> Wang
> Subject: [RFC PATCH 10/11] PCI/MSI: Split the generic MSI code into new file
>
> MSI interrupt will not only used in PCI device, more
> and more Non-PCI device also want to use MSI. ARM
> GIC v3 spec says in ARM platform with GIC v3 controller,
> Non-PCI device can also be design to support MSI to
> simplify interrupt wires, for the existing Non-PCI
> device, consolidator is designed and used to translate
> legacy interrupt to MSI. So for support Non-PCI MSI
> device, generic MSI driver is needed. Split the generic
> MSI code into new location, drivers/msi/msi.c. Then
> MSI driver does not depend PCI anymore.
>
> Signed-off-by: Yijing Wang <wangyij...@huawei.com>
> ---
> drivers/Kconfig | 1 +
> drivers/Makefile | 1 +
> drivers/msi/Kconfig | 8 +
> drivers/msi/Makefile | 1 +
> drivers/msi/msi.c | 540
> ++++++++++++++++++++++++++++++++++++++++++++++++++
> drivers/pci/Kconfig | 6 +-
> drivers/pci/msi.c | 500 ++++-------------------------------------------
> include/linux/msi.h | 31 +++-
> 8 files changed, 617 insertions(+), 471 deletions(-)
> create mode 100644 drivers/msi/Kconfig
> create mode 100644 drivers/msi/Makefile
> create mode 100644 drivers/msi/msi.c
>
> diff --git a/drivers/Kconfig b/drivers/Kconfig
> index 0e87a34..4d05749 100644
> --- a/drivers/Kconfig
> +++ b/drivers/Kconfig
> @@ -176,4 +176,5 @@ source "drivers/powercap/Kconfig"
>
> source "drivers/mcb/Kconfig"
>
> +source "drivers/msi/Kconfig"
> endmenu
> diff --git a/drivers/Makefile b/drivers/Makefile
> index f98b50d..47ae3d1 100644
> --- a/drivers/Makefile
> +++ b/drivers/Makefile
> @@ -158,3 +158,4 @@ obj-$(CONFIG_NTB) += ntb/
> obj-$(CONFIG_FMC) += fmc/
> obj-$(CONFIG_POWERCAP) += powercap/
> obj-$(CONFIG_MCB) += mcb/
> +obj-$(CONFIG_MSI) += msi/
> diff --git a/drivers/msi/Kconfig b/drivers/msi/Kconfig
> new file mode 100644
> index 0000000..739bd13
> --- /dev/null
> +++ b/drivers/msi/Kconfig
> @@ -0,0 +1,8 @@
> +config MSI
> + bool "Message Signaled Interrupts (MSI and MSI-X)"
> + default y
> + help
> + This allows device drivers to use generic MSI(Message
> + Signaled Interrupt). Message Signaled Interrupts enable
> + a device to generate an interrupt using an inbound Memory
> + Write to a specific target address.
> diff --git a/drivers/msi/Makefile b/drivers/msi/Makefile
> new file mode 100644
> index 0000000..39cb026
> --- /dev/null
> +++ b/drivers/msi/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_MSI) += msi.o
> diff --git a/drivers/msi/msi.c b/drivers/msi/msi.c
> new file mode 100644
> index 0000000..3fbd539
> --- /dev/null
> +++ b/drivers/msi/msi.c
> @@ -0,0 +1,540 @@
> +/*
> + * File: msi.c
> + * Purpose: Message Signaled Interrupt (MSI)
> + *
> + * Copyright (C) 2014 Huawei Ltd.
> + * Copyright (C) Yijing Wang <wangyij...@huawei.com>
> + */
> +#include <linux/err.h>
> +#include <linux/mm.h>
> +#include <linux/irq.h>
> +#include <linux/interrupt.h>
> +#include <linux/export.h>
> +#include <linux/ioport.h>
> +#include <linux/proc_fs.h>
> +#include <linux/msi.h>
> +#include <linux/smp.h>
> +#include <linux/errno.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/device.h>
> +#include <linux/pci.h>
> +
> +/* Arch hooks */
> +
> +int __weak arch_setup_msi_irq(struct msi_irqs *msi, struct msi_desc *desc)
> +{
> + struct pci_dev *dev = msi->data;
> + struct msi_chip *chip = dev->bus->msi; //TO BE DONE: rework msi_chip to
> support Non-PCI MSI
> + int err;
> +
> + if (!chip || !chip->setup_irq)
> + return -EINVAL;
> +
> + err = chip->setup_irq(chip, dev, desc);
> + if (err < 0)
> + return err;
> +
> + irq_set_chip_data(desc->irq, chip);
> + return 0;
> +}
> +
> +void __weak arch_teardown_msi_irq(unsigned int irq)
> +{
> + struct msi_chip *chip = irq_get_chip_data(irq);
> +
> + if (!chip || !chip->teardown_irq)
> + return;
> +
> + chip->teardown_irq(chip, irq);
> +}
> +
> +int __weak arch_msi_check_device(struct msi_irqs *msi, int nvec, int type)
> +{
> + struct pci_dev *dev = msi->data;
> + struct msi_chip *chip = dev->bus->msi; //TO BE DONE: rework msi_chip to
> support Non-PCI MSI
> +
> + if (!chip || !chip->check_device)
> + return 0;
> +
> + return chip->check_device(chip, dev, nvec, type);
> +}
> +
> +int __weak arch_setup_msi_irqs(struct msi_irqs *msi, int nvec, int type)
> +{
> + struct msi_desc *entry;
> + int ret;
> +
> + /*
> + * If an architecture wants to support multiple MSI, it needs to
> + * override arch_setup_msi_irqs()
> + */
> + if (type == MSI_TYPE && nvec > 1)
> + return 1;
> +
> + list_for_each_entry(entry, &msi->msi_list, list) {
> + ret = arch_setup_msi_irq(msi, entry);
> + if (ret < 0)
> + return ret;
> + if (ret > 0)
> + return -ENOSPC;
> + }
> + return 0;
> +}
> +
> +
> +void __weak arch_teardown_msi_irqs(struct msi_irqs *msi)
> +{
> + return default_teardown_msi_irqs(msi);
> +}
> +
> +/*
> + * We have a default implementation available as a separate non-weak
> + * function, as it is used by the Xen x86 PCI code
> + */
> +void default_teardown_msi_irqs(struct msi_irqs *msi)
> +{
> + struct msi_desc *entry;
> +
> + list_for_each_entry(entry, &msi->msi_list, list) {
> + int i, nvec;
> + if (entry->irq == 0)
> + continue;
> + if (entry->nvec_used)
> + nvec = entry->nvec_used;
> + else
> + nvec = 1 << entry->msi_attrib.multiple;
> + for (i = 0; i < nvec; i++)
> + arch_teardown_msi_irq(entry->irq + i);
> + }
> +}
> +
> +static void default_restore_msi_irq(struct msi_irqs *msi, int irq)
> +{
> + struct msi_desc *entry;
> +
> + entry = NULL;
> + if (msi->msix_enabled) {
> + list_for_each_entry(entry, &msi->msi_list, list) {
> + if (irq == entry->irq)
> + break;
> + }
> + } else if (msi->msi_enabled) {
> + entry = irq_get_msi_desc(irq);
> + }
> +
> + if (entry)
> + write_msi_msg(irq, &entry->msg);
> +}
> +
> +void default_restore_msi_irqs(struct msi_irqs *msi)
> +{
> + struct msi_desc *entry;
> +
> + list_for_each_entry(entry, &msi->msi_list, list) {
> + default_restore_msi_irq(msi, entry->irq);
> + }
> +}
> +
> +void __weak arch_restore_msi_irqs(struct msi_irqs *msi)
> +{
> + return default_restore_msi_irqs(msi);
> +}
> +
> +u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
> +{
> + struct msi_irqs *msi = desc->msi;
> +
> + if (!msi || !msi->ops || !msi->ops->msi_mask_irq)
> + return desc->masked;
> + return msi->ops->msi_mask_irq(desc, mask, flag);
> +}
> +
> +__weak u32 arch_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
> +{
> + return default_msi_mask_irq(desc, mask, flag);
> +}
> +
> +void msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
> +{
> + desc->masked = arch_msi_mask_irq(desc, mask, flag);
> +}
> +
> +u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag)
> +{
> + struct msi_irqs *msi = desc->msi;
> +
> + if (!msi || !msi->ops || !msi->ops->msix_mask_irq)
> + return desc->masked;
> +
> + return msi->ops->msix_mask_irq(desc, flag);
> +}
> +
> +__weak u32 arch_msix_mask_irq(struct msi_desc *desc, u32 flag)
> +{
> + return default_msix_mask_irq(desc, flag);
> +}
> +
> +void msix_mask_irq(struct msi_desc *desc, u32 flag)
> +{
> + desc->masked = arch_msix_mask_irq(desc, flag);
> +}
> +
> +static void msi_set_mask_bit(struct irq_data *data, u32 flag)
> +{
> + struct msi_desc *desc = irq_data_get_msi(data);
> +
> + if (desc->msi_attrib.is_msix) {
> + msix_mask_irq(desc, flag);
> + readl(desc->mask_base); /* Flush write to device */
> + } else {
> + unsigned offset = data->irq - desc->irq;
> + msi_mask_irq(desc, 1 << offset, flag << offset);
> + }
> +}
> +
> +void mask_msi_irq(struct irq_data *data)
> +{
> + msi_set_mask_bit(data, 1);
> +}
> +
> +void unmask_msi_irq(struct irq_data *data)
> +{
> + msi_set_mask_bit(data, 0);
> +}
> +
> +void msi_set_enable(struct msi_irqs *msi, int enable, int type)
> +{
> + if (!msi || !msi->ops || !msi->ops->msi_set_enable)
> + return;
> + msi->ops->msi_set_enable(msi, enable, type);
> +}
> +EXPORT_SYMBOL(msi_set_enable);
> +
> +void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> +{
> + struct msi_irqs *msi = entry->msi;
> +
> + if (!msi || !msi->ops || !msi->ops->msi_read_message)
> + return;
> + msi->ops->msi_read_message(entry, msg);
> +}
> +
> +void read_msi_msg(unsigned int irq, struct msi_msg *msg)
> +{
> + struct msi_desc *entry = irq_get_msi_desc(irq);
> +
> + __read_msi_msg(entry, msg);
> +}
> +
> +void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> +{
> + /* Assert that the cache is valid, assuming that
> + * valid messages are not all-zeroes. */
> + BUG_ON(!(entry->msg.address_hi | entry->msg.address_lo |
> + entry->msg.data));
> +
> + *msg = entry->msg;
> +}
> +
> +void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
> +{
> + struct msi_desc *entry = irq_get_msi_desc(irq);
> +
> + __get_cached_msi_msg(entry, msg);
> +}
> +
> +void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> +{
> + struct msi_irqs *msi = entry->msi;
> +
> + if (!msi || !msi->ops || !msi->ops->msi_write_message)
> + return;
> + msi->ops->msi_write_message(entry, msg);
> +}
> +
> +void write_msi_msg(unsigned int irq, struct msi_msg *msg)
> +{
> + struct msi_desc *entry = irq_get_msi_desc(irq);
> +
> + __write_msi_msg(entry, msg);
> +}
> +
> +void free_msi_irqs(struct msi_irqs *msi)
> +{
> + struct msi_desc *entry, *tmp;
> +
> + list_for_each_entry(entry, &msi->msi_list, list) {
> + int i, nvec;
> + if (!entry->irq)
> + continue;
> + if (entry->nvec_used)
> + nvec = entry->nvec_used;
> + else
> + nvec = 1 << entry->msi_attrib.multiple;
> + for (i = 0; i < nvec; i++)
> + BUG_ON(irq_has_action(entry->irq + i));
> + }
> +
> + arch_teardown_msi_irqs(msi);
> +
> + list_for_each_entry_safe(entry, tmp, &msi->msi_list, list) {
> + if (entry->msi_attrib.is_msix) {
> + if (list_is_last(&entry->list, &msi->msi_list))
> + iounmap(entry->mask_base);
> + }
> +
> + /*
> + * Its possible that we get into this path
> + * When populate_msi_sysfs fails, which means the entries
> + * were not registered with sysfs. In that case don't
> + * unregister them.
> + */
> + if (entry->kobj.parent) {
> + kobject_del(&entry->kobj);
> + kobject_put(&entry->kobj);
> + }
> +
> + list_del(&entry->list);
> + kfree(entry);
> + }
> +}
> +EXPORT_SYMBOL(free_msi_irqs);
> +
> +struct msi_irqs *alloc_msi_irqs(void *data, struct msi_ops *ops)
> +{
> + struct msi_irqs *msi;
> +
> + msi = kzalloc(sizeof(struct msi_irqs), GFP_KERNEL);
> + if (!msi)
> + return NULL;
> +
> + INIT_LIST_HEAD(&msi->msi_list);
> + msi->data = data;
> + msi->ops = ops;
> + return msi;
> +}
> +EXPORT_SYMBOL(alloc_msi_irqs);
> +
> +struct msi_desc *alloc_msi_entry(struct msi_irqs *msi)
> +{
> + struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL);
> + if (!desc)
> + return NULL;
> +
> + INIT_LIST_HEAD(&desc->list);
> + desc->msi = msi;
> +
> + return desc;
> +}
> +EXPORT_SYMBOL(alloc_msi_entry);
> +
> +static void msi_set_intx(struct msi_irqs *msi, int flag)
> +{
> + if (!msi || !msi->ops || !msi->ops->msi_set_intx)
> + return;
> + msi->ops->msi_set_intx(msi, flag);
> +}
> +
> +void msi_shutdown(struct msi_irqs *msi)
> +{
> + u32 mask;
> + struct msi_desc *desc;
> +
> + if (!msi || !msi->msi_enabled)
> + return;
> +
> + BUG_ON(list_empty(&msi->msi_list));
> +
> + desc = list_first_entry(&msi->msi_list, struct msi_desc, list);
> + msi_set_enable(msi, 0, MSI_TYPE);
> + msi_set_intx(msi, 1);
> + msi->msi_enabled = 0;
> +
> + mask = msi_mask(desc->msi_attrib.multi_cap);
> + arch_msi_mask_irq(desc, mask, ~mask);
> +}
> +
> +void msix_shutdown(struct msi_irqs *msi)
> +{
> + struct msi_desc *entry;
> +
> + if (!msi || !msi->msix_enabled)
> + return;
> +
> + list_for_each_entry(entry, &msi->msi_list, list)
> + arch_msix_mask_irq(entry, 1);
> +
> + msi_set_enable(msi, 0, MSIX_TYPE);
> + msi_set_intx(msi, 1);
> + msi->msix_enabled = 0;
> +}
> +
> +static struct msi_desc * msi_setup_entry(struct msi_irqs *msi)
> +{
> + struct msi_desc *entry;
> +
> + entry = alloc_msi_entry(msi);
> + if (!entry)
> + return NULL;
> +
> + entry->msi_attrib.is_msix = 0;
> + entry->msi_attrib.entry_nr = 0;
> +
> + if (!msi->ops || !msi->ops->msi_setup_entry) {
> + kfree(entry);
> + return NULL;
> + }
Can we move this check at the start of the function?
> +
> + msi->ops->msi_setup_entry(msi, entry);
> + return entry;
> +}
> +
> +static int msix_setup_entries(struct msi_irqs *msi, void __iomem *base,
> + struct msix_entry *entries, int nvec)
> +{
> + struct msi_desc *entry;
> + int i;
> +
> + for (i = 0; i < nvec; i++) {
> + entry = alloc_msi_entry(msi);
> + if (!entry) {
> + if (!i)
> + iounmap(base);
> + else
> + free_msi_irqs(msi);
> + /* No enough memory. Don't try again */
> + return -ENOMEM;
> + }
> +
> + entry->msi_attrib.is_msix = 1;
> + entry->msi_attrib.is_64 = 1;
> + entry->msi_attrib.entry_nr = entries[i].entry;
> + entry->mask_base = base;
> +
> + list_add_tail(&entry->list, &msi->msi_list);
> + }
> +
> + if (msi->ops && msi->ops->msix_setup_entries)
> + return msi->ops->msix_setup_entries(msi, entries);
> +
> + return 0;
> +}
> +
> +/**
> + * msi_capability_init - configure device's MSI capability structure
> + * @msi: pointer to the msi_irqs data structure of MSI device function
> + * @nvec: number of interrupts to allocate
> + *
> + * Setup the MSI capability structure of the device with the requested
> + * number of interrupts. A return value of zero indicates the successful
> + * setup of an entry with the new MSI irq. A negative return value indicates
> + * an error, and a positive return value indicates the number of interrupts
> + * which could have been allocated.
> + */
> +int msi_capability_init(struct msi_irqs *msi, int nvec)
> +{
> + struct msi_desc *entry;
> + int ret;
> + unsigned mask;
> +
> + msi_set_enable(msi, 0, MSI_TYPE); /* Disable MSI during set up */
> +
> + /* MSI Entry Initialization */
> + entry = msi_setup_entry(msi);
> + if (!entry)
> + return -ENOMEM;
> +
> + /* All MSIs are unmasked by default, Mask them all */
Will this be true for non-pci devices as well?
Thanks
-Bharat
> + mask = msi_mask(entry->msi_attrib.multi_cap);
> + msi_mask_irq(entry, mask, mask);
> +
> + /* Configure MSI capability structure */
> + ret = arch_setup_msi_irqs(msi, nvec, MSI_TYPE);
> + if (ret)
> + goto err;
> +
> + /* Set MSI enabled bits */
> + msi_set_intx(msi, 0);
> + msi_set_enable(msi, 1, MSI_TYPE);
> + msi->msi_enabled = 1;
> +
> + return 0;
> +
> +err:
> + msi_mask_irq(entry, mask, ~mask);
> + free_msi_irqs(msi);
> + return ret;
> +}
> +
> +static void msix_program_entries(struct msi_irqs *msi,
> + struct msix_entry *entries)
> +{
> + struct msi_desc *entry;
> + int i = 0;
> +
> + list_for_each_entry(entry, &msi->msi_list, list) {
> + entries[i].vector = entry->irq;
> + irq_set_msi_desc(entry->irq, entry);
> + i++;
> + }
> +}
> +
> +/**
> + * msix_capability_init - configure device's MSI-X capability
> + * @dev: pointer to the pci_dev data structure of MSI-X device function
> + * @entries: pointer to an array of struct msix_entry entries
> + * @nvec: number of @entries
> + *
> + * Setup the MSI-X capability structure of device function with a
> + * single MSI-X irq. A return of zero indicates the successful setup of
> + * requested MSI-X entries with allocated irqs or non-zero for otherwise.
> + **/
> +int msix_capability_init(struct msi_irqs *msi, void __iomem *base,
> + struct msix_entry *entries, int nvec)
> +{
> + int ret;
> +
> + /* Ensure MSI-X is disabled while it is set up */
> + msi_set_enable(msi, 0, MSIX_TYPE);
> +
> + ret = msix_setup_entries(msi, base, entries, nvec);
> + if (ret)
> + return ret;
> +
> + ret = arch_setup_msi_irqs(msi, nvec, MSIX_TYPE);
> + if (ret)
> + goto out_avail;
> +
> + msix_program_entries(msi, entries);
> +
> + /* Set MSI-X enabled bits and unmask the function */
> + msi_set_intx(msi, 0);
> + msi->msix_enabled = 1;
> +
> + msi_set_enable(msi, 1, MSIX_TYPE);
> +
> + return 0;
> +
> +out_avail:
> + if (ret < 0) {
> + /*
> + * If we had some success, report the number of irqs
> + * we succeeded in setting up.
> + */
> + struct msi_desc *entry;
> + int avail = 0;
> +
> + list_for_each_entry(entry, &msi->msi_list, list) {
> + if (entry->irq != 0)
> + avail++;
> + }
> + if (avail != 0)
> + ret = avail;
> + }
> +
> + free_msi_irqs(msi);
> +
> + return ret;
> +}
> +
> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> index 893503f..1a10488 100644
> --- a/drivers/pci/Kconfig
> +++ b/drivers/pci/Kconfig
> @@ -2,10 +2,10 @@
> # PCI configuration
> #
> config PCI_MSI
> - bool "Message Signaled Interrupts (MSI and MSI-X)"
> - depends on PCI
> + bool "PCI Message Signaled Interrupts (MSI and MSI-X)"
> + depends on PCI && MSI
> help
> - This allows device drivers to enable MSI (Message Signaled
> + This allows PCI device drivers to enable MSI (Message Signaled
> Interrupts). Message Signaled Interrupts enable a device to
> generate an interrupt using an inbound Memory Write on its
> PCI bus instead of asserting a device IRQ pin.
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index f0c5989..df7223c 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -26,121 +26,8 @@ static int pci_msi_enable = 1;
>
> #define msix_table_size(flags) ((flags & PCI_MSIX_FLAGS_QSIZE) + 1)
>
> -
> -/* Arch hooks */
> -
> -int __weak arch_setup_msi_irq(struct msi_irqs *msi, struct msi_desc *desc)
> -{
> - struct pci_dev *dev = msi->data; //TO BE DONE: rework msi_chip to
> support
> Non-PCI
> - struct msi_chip *chip = dev->bus->msi;
> - int err;
> -
> - if (!chip || !chip->setup_irq)
> - return -EINVAL;
> -
> - err = chip->setup_irq(chip, dev, desc);
> - if (err < 0)
> - return err;
> -
> - irq_set_chip_data(desc->irq, chip);
> -
> - return 0;
> -}
> -
> -void __weak arch_teardown_msi_irq(unsigned int irq)
> -{
> - struct msi_chip *chip = irq_get_chip_data(irq);
> -
> - if (!chip || !chip->teardown_irq)
> - return;
> -
> - chip->teardown_irq(chip, irq);
> -}
> -
> -int __weak arch_msi_check_device(struct msi_irqs *msi, int nvec, int type)
> -{
> - struct pci_dev *dev = msi->data; //TO BE DONE: rework msi_chip to
> support
> Non-PCI
> - struct msi_chip *chip = dev->bus->msi;
> -
> - if (!chip || !chip->check_device)
> - return 0;
> -
> - return chip->check_device(chip, dev, nvec, type);
> -}
> -
> -int __weak arch_setup_msi_irqs(struct msi_irqs *msi, int nvec, int type)
> -{
> - struct msi_desc *entry;
> - int ret;
> -
> - /*
> - * If an architecture wants to support multiple MSI, it needs to
> - * override arch_setup_msi_irqs()
> - */
> - if (type == MSI_TYPE && nvec > 1)
> - return 1;
> -
> - list_for_each_entry(entry, &msi->msi_list, list) {
> - ret = arch_setup_msi_irq(msi, entry);
> - if (ret < 0)
> - return ret;
> - if (ret > 0)
> - return -ENOSPC;
> - }
> -
> - return 0;
> -}
> -
> -/*
> - * We have a default implementation available as a separate non-weak
> - * function, as it is used by the Xen x86 PCI code
> - */
> -void default_teardown_msi_irqs(struct msi_irqs *msi)
> -{
> - struct msi_desc *entry;
> -
> - list_for_each_entry(entry, &msi->msi_list, list) {
> - int i, nvec;
> - if (entry->irq == 0)
> - continue;
> - if (entry->nvec_used)
> - nvec = entry->nvec_used;
> - else
> - nvec = 1 << entry->msi_attrib.multiple;
> - for (i = 0; i < nvec; i++)
> - arch_teardown_msi_irq(entry->irq + i);
> - }
> -}
> -
> -void __weak arch_teardown_msi_irqs(struct msi_irqs *msi)
> -{
> - return default_teardown_msi_irqs(msi);
> -}
> -
> -static void default_restore_msi_irq(struct msi_irqs *msi, int irq)
> -{
> - struct msi_desc *entry;
> -
> - entry = NULL;
> - if (msi->msix_enabled) {
> - list_for_each_entry(entry, &msi->msi_list, list) {
> - if (irq == entry->irq)
> - break;
> - }
> - } else if (msi->msi_enabled) {
> - entry = irq_get_msi_desc(irq);
> - }
> -
> - if (entry)
> - write_msi_msg(irq, &entry->msg);
> -}
> -
> -void __weak arch_restore_msi_irqs(struct msi_irqs *msi)
> -{
> - return default_restore_msi_irqs(msi);
> -}
> -
> -static void msix_clear_and_set_ctrl(struct pci_dev *dev, u16 clear, u16 set)
> +static void msix_clear_and_set_ctrl(struct pci_dev *dev,
> + u16 clear, u16 set)
> {
> u16 ctrl;
>
> @@ -150,7 +37,7 @@ static void msix_clear_and_set_ctrl(struct pci_dev *dev,
> u16
> clear, u16 set)
> pci_write_config_word(dev, dev->msix_cap + PCI_MSIX_FLAGS, ctrl);
> }
>
> -static void msi_set_enable(struct msi_irqs *msi, int enable, int type)
> +static void pci_msi_set_enable(struct msi_irqs *msi, int enable, int type)
> {
> u16 control;
> struct pci_dev *dev = msi->data;
> @@ -169,21 +56,13 @@ static void msi_set_enable(struct msi_irqs *msi, int
> enable, int type)
> }
> }
>
> -static inline __attribute_const__ u32 msi_mask(unsigned x)
> -{
> - /* Don't shift by >= width of type */
> - if (x >= 5)
> - return 0xffffffff;
> - return (1 << (1 << x)) - 1;
> -}
> -
> /*
> * 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.
> */
> -u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
> +u32 pci_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
> {
> struct pci_dev *dev = desc->msi->data;
> u32 mask_bits = desc->masked;
> @@ -198,16 +77,6 @@ u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask,
> u32 flag)
> return mask_bits;
> }
>
> -__weak u32 arch_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
> -{
> - return default_msi_mask_irq(desc, mask, flag);
> -}
> -
> -static void msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag)
> -{
> - desc->masked = arch_msi_mask_irq(desc, mask, flag);
> -}
> -
> /*
> * This internal function does not flush PCI writes to the device.
> * All users must ensure that they read from the device before either
> @@ -215,7 +84,7 @@ static void msi_mask_irq(struct msi_desc *desc, u32 mask,
> u32
> flag)
> * file. This saves a few milliseconds when initialising devices with lots
> * of MSI-X interrupts.
> */
> -u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag)
> +u32 pci_msix_mask_irq(struct msi_desc *desc, u32 flag)
> {
> u32 mask_bits = desc->masked;
> unsigned offset = desc->msi_attrib.entry_nr * PCI_MSIX_ENTRY_SIZE +
> @@ -228,40 +97,7 @@ u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag)
> return mask_bits;
> }
>
> -__weak u32 arch_msix_mask_irq(struct msi_desc *desc, u32 flag)
> -{
> - return default_msix_mask_irq(desc, flag);
> -}
> -
> -static void msix_mask_irq(struct msi_desc *desc, u32 flag)
> -{
> - desc->masked = arch_msix_mask_irq(desc, flag);
> -}
> -
> -static void msi_set_mask_bit(struct irq_data *data, u32 flag)
> -{
> - struct msi_desc *desc = irq_data_get_msi(data);
> -
> - if (desc->msi_attrib.is_msix) {
> - msix_mask_irq(desc, flag);
> - readl(desc->mask_base); /* Flush write to device */
> - } else {
> - unsigned offset = data->irq - desc->irq;
> - msi_mask_irq(desc, 1 << offset, flag << offset);
> - }
> -}
> -
> -void mask_msi_irq(struct irq_data *data)
> -{
> - msi_set_mask_bit(data, 1);
> -}
> -
> -void unmask_msi_irq(struct irq_data *data)
> -{
> - msi_set_mask_bit(data, 0);
> -}
> -
> -static void msix_set_all_mask(struct msi_irqs *msi, int flag)
> +static void pci_msix_set_all_mask(struct msi_irqs *msi, int flag)
> {
> struct pci_dev *dev = msi->data;
>
> @@ -271,16 +107,7 @@ static void msix_set_all_mask(struct msi_irqs *msi, int
> flag)
> msix_clear_and_set_ctrl(dev, PCI_MSIX_FLAGS_MASKALL, 0);
> }
>
> -void default_restore_msi_irqs(struct msi_irqs *msi)
> -{
> - struct msi_desc *entry;
> -
> - list_for_each_entry(entry, &msi->msi_list, list) {
> - default_restore_msi_irq(msi, entry->irq);
> - }
> -}
> -
> -void __read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> +void pci_read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> {
> struct pci_dev *dev = entry->msi->data;
>
> @@ -311,31 +138,7 @@ void __read_msi_msg(struct msi_desc *entry, struct
> msi_msg
> *msg)
> }
> }
>
> -void read_msi_msg(unsigned int irq, struct msi_msg *msg)
> -{
> - struct msi_desc *entry = irq_get_msi_desc(irq);
> -
> - __read_msi_msg(entry, msg);
> -}
> -
> -void __get_cached_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> -{
> - /* Assert that the cache is valid, assuming that
> - * valid messages are not all-zeroes. */
> - BUG_ON(!(entry->msg.address_hi | entry->msg.address_lo |
> - entry->msg.data));
> -
> - *msg = entry->msg;
> -}
> -
> -void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg)
> -{
> - struct msi_desc *entry = irq_get_msi_desc(irq);
> -
> - __get_cached_msi_msg(entry, msg);
> -}
> -
> -void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> +void pci_write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
> {
> struct pci_dev *dev = entry->msi->data;
>
> @@ -373,13 +176,6 @@ void __write_msi_msg(struct msi_desc *entry, struct
> msi_msg
> *msg)
> entry->msg = *msg;
> }
>
> -void write_msi_msg(unsigned int irq, struct msi_msg *msg)
> -{
> - struct msi_desc *entry = irq_get_msi_desc(irq);
> -
> - __write_msi_msg(entry, msg);
> -}
> -
> static void free_msi_sysfs(struct pci_dev *dev)
> {
> struct attribute **msi_attrs;
> @@ -403,58 +199,6 @@ static void free_msi_sysfs(struct pci_dev *dev)
> }
> }
>
> -static void free_msi_irqs(struct msi_irqs *msi)
> -{
> - struct msi_desc *entry, *tmp;
> -
> - list_for_each_entry(entry, &msi->msi_list, list) {
> - int i, nvec;
> - if (!entry->irq)
> - continue;
> - if (entry->nvec_used)
> - nvec = entry->nvec_used;
> - else
> - nvec = 1 << entry->msi_attrib.multiple;
> - for (i = 0; i < nvec; i++)
> - BUG_ON(irq_has_action(entry->irq + i));
> - }
> -
> - arch_teardown_msi_irqs(msi);
> -
> - list_for_each_entry_safe(entry, tmp, &msi->msi_list, list) {
> - if (entry->msi_attrib.is_msix) {
> - if (list_is_last(&entry->list, &msi->msi_list))
> - iounmap(entry->mask_base);
> - }
> -
> - /*
> - * Its possible that we get into this path
> - * When populate_msi_sysfs fails, which means the entries
> - * were not registered with sysfs. In that case don't
> - * unregister them.
> - */
> - if (entry->kobj.parent) {
> - kobject_del(&entry->kobj);
> - kobject_put(&entry->kobj);
> - }
> -
> - list_del(&entry->list);
> - kfree(entry);
> - }
> -}
> -
> -static struct msi_desc *alloc_msi_entry(struct msi_irqs *msi)
> -{
> - struct msi_desc *desc = kzalloc(sizeof(*desc), GFP_KERNEL);
> - if (!desc)
> - return NULL;
> -
> - INIT_LIST_HEAD(&desc->list);
> - desc->msi = msi;
> -
> - return desc;
> -}
> -
> static void pci_intx_for_msi(struct msi_irqs *msi, int enable)
> {
> struct pci_dev *dev = msi->data;
> @@ -474,7 +218,7 @@ static void __pci_restore_msi_state(struct pci_dev *dev)
> entry = irq_get_msi_desc(dev->irq);
>
> pci_intx_for_msi(dev->msi, 0);
> - msi_set_enable(dev->msi, 0, MSI_TYPE);
> + pci_msi_set_enable(dev->msi, 0, MSI_TYPE);
> arch_restore_msi_irqs(dev->msi);
>
> pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
> @@ -496,13 +240,13 @@ static void __pci_restore_msix_state(struct pci_dev
> *dev)
>
> /* route the table */
> pci_intx_for_msi(msi, 0);
> - msi_set_enable(msi, 1, MSIX_TYPE);
> - msix_set_all_mask(msi, 1);
> + pci_msi_set_enable(msi, 1, MSIX_TYPE);
> + pci_msix_set_all_mask(msi, 1);
> arch_restore_msi_irqs(msi);
> list_for_each_entry(entry, &msi->msi_list, list)
> msix_mask_irq(entry, entry->masked);
>
> - msix_set_all_mask(msi, 0);
> + pci_msix_set_all_mask(msi, 0);
> }
>
> void pci_restore_msi_state(struct pci_dev *dev)
> @@ -606,22 +350,16 @@ error_attrs:
> return ret;
> }
>
> -static struct msi_desc *msi_setup_entry(struct msi_irqs *msi)
> +static struct msi_desc *pci_msi_setup_entry(struct msi_irqs *msi,
> + struct msi_desc *entry)
> {
> u16 control;
> - struct msi_desc *entry;
> struct pci_dev *dev = msi->data;
>
> /* MSI Entry Initialization */
> - entry = alloc_msi_entry(msi);
> - if (!entry)
> - return NULL;
> -
> pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
>
> - entry->msi_attrib.is_msix = 0;
> entry->msi_attrib.is_64 = !!(control & PCI_MSI_FLAGS_64BIT);
> - entry->msi_attrib.entry_nr = 0;
> entry->msi_attrib.maskbit = !!(control & PCI_MSI_FLAGS_MASKBIT);
> entry->msi_attrib.default_irq = dev->irq; /* Save IOAPIC IRQ */
> entry->msi_attrib.multi_cap = (control & PCI_MSI_FLAGS_QMASK) >> 1;
> @@ -638,52 +376,6 @@ static struct msi_desc *msi_setup_entry(struct msi_irqs
> *msi)
> return entry;
> }
>
> -/**
> - * 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
> - *
> - * Setup the MSI capability structure of the device with the requested
> - * number of interrupts. A return value of zero indicates the successful
> - * setup of an entry with the new MSI irq. A negative return value indicates
> - * an error, and a positive return value indicates the number of interrupts
> - * which could have been allocated.
> - */
> -static int msi_capability_init(struct msi_irqs *msi, int nvec)
> -{
> - struct msi_desc *entry;
> - int ret;
> - unsigned mask;
> -
> - msi_set_enable(msi, 0, MSI_TYPE); /* Disable MSI during set up */
> -
> - entry = msi_setup_entry(msi);
> - if (!entry)
> - return -ENOMEM;
> -
> - /* All MSIs are unmasked by default, Mask them all */
> - mask = msi_mask(entry->msi_attrib.multi_cap);
> - msi_mask_irq(entry, mask, mask);
> -
> - list_add_tail(&entry->list, &msi->msi_list);
> -
> - /* Configure MSI capability structure */
> - ret = arch_setup_msi_irqs(msi, nvec, MSI_TYPE);
> - if (ret)
> - goto err;
> -
> - /* Set MSI enabled bits */
> - pci_intx_for_msi(msi, 0);
> - msi_set_enable(msi, 1, MSI_TYPE);
> - msi->msi_enabled = 1;
> - return 0;
> -
> -err:
> - msi_mask_irq(entry, mask, ~mask);
> - free_msi_irqs(msi);
> - return ret;
> -}
> -
> static void __iomem *msix_map_region(struct pci_dev *dev, unsigned
> nr_entries)
> {
> resource_size_t phys_addr;
> @@ -699,28 +391,19 @@ static void __iomem *msix_map_region(struct pci_dev
> *dev,
> unsigned nr_entries)
> return ioremap_nocache(phys_addr, nr_entries * PCI_MSIX_ENTRY_SIZE);
> }
>
> -static int msix_setup_entries(struct msi_irqs *msi, void __iomem *base,
> - struct msix_entry *entries, int nvec)
> +static int pci_msix_setup_entries(struct msi_irqs *msi, struct msix_entry
> *entries)
> {
> + int offset, i = 0;
> struct msi_desc *entry;
> - int i, offset;
> struct pci_dev *dev = msi->data;
>
> - for (i = 0; i < nvec; i++) {
> - entry = alloc_msi_entry(msi);
> - if (!entry) {
> - if (!i)
> - iounmap(base);
> - else
> - free_msi_irqs(msi);
> - /* No enough memory. Don't try again */
> - return -ENOMEM;
> - }
>
> - entry->msi_attrib.is_msix = 1;
> - entry->msi_attrib.is_64 = 1;
> - entry->msi_attrib.entry_nr = entries[i].entry;
> - entry->mask_base = base;
> + list_for_each_entry(entry, &msi->msi_list, list) {
> + /*
> + * Some devices require MSI-X to be enabled before we can touch
> the
> + * MSI-X registers. We need to mask all the vectors to prevent
> + * interrupts coming in before they're fully set up.
> + */
>
> msix_clear_and_set_ctrl(dev, 0,
> PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE);
> @@ -730,87 +413,10 @@ static int msix_setup_entries(struct msi_irqs *msi, void
> __iomem *base,
> msix_mask_irq(entry, 1);
> msix_clear_and_set_ctrl(dev,
> PCI_MSIX_FLAGS_MASKALL | PCI_MSIX_FLAGS_ENABLE,
> 0);
> -
> - list_add_tail(&entry->list, &msi->msi_list);
> - }
> -
> - return 0;
> -}
> -
> -static void msix_program_entries(struct msi_irqs *msi,
> - struct msix_entry *entries)
> -{
> - struct msi_desc *entry;
> - int i = 0;
> -
> - list_for_each_entry(entry, &msi->msi_list, list) {
> - entries[i].vector = entry->irq;
> - irq_set_msi_desc(entry->irq, entry);
> i++;
> }
> -}
> -
> -/**
> - * msix_capability_init - configure device's MSI-X capability
> - * @dev: pointer to the pci_dev data structure of MSI-X device function
> - * @entries: pointer to an array of struct msix_entry entries
> - * @nvec: number of @entries
> - *
> - * Setup the MSI-X capability structure of device function with a
> - * single MSI-X irq. A return of zero indicates the successful setup of
> - * requested MSI-X entries with allocated irqs or non-zero for otherwise.
> - **/
> -static int msix_capability_init(struct msi_irqs *msi, void __iomem *base,
> - struct msix_entry *entries, int nvec)
> -{
> - int ret;
> -
> - /* Ensure MSI-X is disabled while it is set up */
> - msi_set_enable(msi, 0, MSIX_TYPE);
> -
> - ret = msix_setup_entries(msi, base, entries, nvec);
> - if (ret)
> - return ret;
> -
> - ret = arch_setup_msi_irqs(msi, nvec, MSIX_TYPE);
> - if (ret)
> - goto out_avail;
> -
> - /*
> - * Some devices require MSI-X to be enabled before we can touch the
> - * MSI-X registers. We need to mask all the vectors to prevent
> - * interrupts coming in before they're fully set up.
> - */
> - msix_program_entries(msi, entries);
> -
> - /* Set MSI-X enabled bits and unmask the function */
> - pci_intx_for_msi(msi, 0);
> - msi->msix_enabled = 1;
> -
> - msi_set_enable(msi, 1, MSIX_TYPE);
>
> return 0;
> -
> -out_avail:
> - if (ret < 0) {
> - /*
> - * If we had some success, report the number of irqs
> - * we succeeded in setting up.
> - */
> - struct msi_desc *entry;
> - int avail = 0;
> -
> - list_for_each_entry(entry, &msi->msi_list, list) {
> - if (entry->irq != 0)
> - avail++;
> - }
> - if (avail != 0)
> - ret = avail;
> - }
> -
> - free_msi_irqs(msi);
> -
> - return ret;
> }
>
> /**
> @@ -886,25 +492,14 @@ EXPORT_SYMBOL(pci_msi_vec_count);
> void pci_msi_shutdown(struct pci_dev *dev)
> {
> struct msi_desc *desc;
> - u32 mask;
>
> if (!pci_msi_enable || !dev ||
> !pci_dev_msi_enabled(dev, MSI_TYPE))
> return;
>
> - BUG_ON(list_empty(&dev->msi->msi_list));
> - desc = list_first_entry(&dev->msi->msi_list, struct msi_desc, list);
> -
> - msi_set_enable(dev->msi, 0, MSI_TYPE);
> - pci_intx_for_msi(dev->msi, 1);
> - dev->msi->msi_enabled = 0;
> -
> - /* Return the device with MSI unmasked as initial states */
> - mask = msi_mask(desc->msi_attrib.multi_cap);
> - /* Keep cached state to be restored */
> - arch_msi_mask_irq(desc, mask, ~mask);
> -
> + msi_shutdown(dev->msi);
> /* Restore dev->irq to its default pin-assertion irq */
> + desc = list_first_entry(&dev->msi->msi_list, struct msi_desc, list);
> dev->irq = desc->msi_attrib.default_irq;
> }
>
> @@ -1014,20 +609,10 @@ EXPORT_SYMBOL(pci_enable_msix);
>
> void pci_msix_shutdown(struct pci_dev *dev)
> {
> - struct msi_desc *entry;
> -
> - if (!pci_msi_enable || !dev || !pci_dev_msi_enabled(dev, MSIX_TYPE))
> + if (!pci_msi_enable || !dev)
> return;
>
> - /* Return the device with MSI-X masked as initial states */
> - list_for_each_entry(entry, &dev->msi->msi_list, list) {
> - /* Keep cached states to be restored */
> - arch_msix_mask_irq(entry, 1);
> - }
> -
> - msi_set_enable(dev->msi, 0, MSIX_TYPE);
> - pci_intx_for_msi(dev->msi, 1);
> - dev->msi->msix_enabled = 0;
> + msix_shutdown(dev->msi);
> }
>
> void pci_disable_msix(struct pci_dev *dev)
> @@ -1060,30 +645,16 @@ int pci_msi_enabled(void)
> EXPORT_SYMBOL(pci_msi_enabled);
>
> static struct msi_ops pci_msi = {
> - .msi_set_enable = msi_set_enable,
> - .msi_setup_entry = msi_setup_entry,
> - .msix_setup_entries = msix_setup_entries,
> - .msi_mask_irq = default_msi_mask_irq,
> - .msix_mask_irq = default_msix_mask_irq,
> - .msi_read_message = __read_msi_msg,
> - .msi_write_message = __write_msi_msg,
> + .msi_set_enable = pci_msi_set_enable,
> + .msi_setup_entry = pci_msi_setup_entry,
> + .msix_setup_entries = pci_msix_setup_entries,
> + .msi_mask_irq = pci_msi_mask_irq,
> + .msix_mask_irq = pci_msix_mask_irq,
> + .msi_read_message = pci_read_msi_msg,
> + .msi_write_message = pci_write_msi_msg,
> .msi_set_intx = pci_intx_for_msi,
> };
>
> -struct msi_irqs *alloc_msi_irqs(void *data, struct msi_ops *ops)
> -{
> - struct msi_irqs *msi;
> -
> - msi = kzalloc(sizeof(struct msi_irqs), GFP_KERNEL);
> - if (!msi)
> - return NULL;
> -
> - INIT_LIST_HEAD(&msi->msi_list);
> - msi->data = data;
> - msi->ops = ops;
> - return msi;
> -}
> -
> void pci_msi_init_pci_dev(struct pci_dev *dev)
> {
> /* Disable the msi hardware to avoid screaming interrupts
> @@ -1100,10 +671,10 @@ void pci_msi_init_pci_dev(struct pci_dev *dev)
>
> dev->msi->node = dev_to_node(&dev->dev);
> if (dev->msi_cap)
> - msi_set_enable(dev->msi, 0, MSI_TYPE);
> + pci_msi_set_enable(dev->msi, 0, MSI_TYPE);
>
> if (dev->msix_cap)
> - msi_set_enable(dev->msi, 0, MSIX_TYPE);
> + pci_msi_set_enable(dev->msi, 0, MSIX_TYPE);
> }
> }
>
> @@ -1224,4 +795,3 @@ int pci_enable_msix_range(struct pci_dev *dev, struct
> msix_entry *entries,
> }
> EXPORT_SYMBOL(pci_enable_msix_range);
>
> -
> diff --git a/include/linux/msi.h b/include/linux/msi.h
> index fc8f3e8..87ed0dd 100644
> --- a/include/linux/msi.h
> +++ b/include/linux/msi.h
> @@ -28,9 +28,9 @@ struct msix_entry {
>
> struct msi_ops {
> void (*msi_set_enable)(struct msi_irqs *msi, int enable, int type);
> - struct msi_desc *(*msi_setup_entry)(struct msi_irqs *msi);
> - int (*msix_setup_entries)(struct msi_irqs *msi, void __iomem *base,
> - struct msix_entry *entries, int nvec);
> + struct msi_desc *(*msi_setup_entry)(struct msi_irqs *msi,
> + struct msi_desc *entry);
> + int (*msix_setup_entries)(struct msi_irqs *msi, struct msix_entry
> *entries);
> u32 (*msi_mask_irq)(struct msi_desc *desc, u32 mask, u32 flag);
> u32 (*msix_mask_irq)(struct msi_desc *desc, u32 flag);
> void (*msi_read_message)(struct msi_desc *desc, struct msi_msg *msg);
> @@ -49,6 +49,18 @@ void __write_msi_msg(struct msi_desc *entry, struct msi_msg
> *msg);
> void read_msi_msg(unsigned int irq, struct msi_msg *msg);
> void get_cached_msi_msg(unsigned int irq, struct msi_msg *msg);
> void write_msi_msg(unsigned int irq, struct msi_msg *msg);
> +struct msi_desc *alloc_msi_entry(struct msi_irqs *msi);
> +void msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
> +void msix_mask_irq(struct msi_desc *desc, u32 flag);
> +void msi_set_enable(struct msi_irqs *msi, int enable, int type);
> +
> +struct msi_irqs *alloc_msi_irqs(void *data, struct msi_ops *ops);
> +
> +void free_msi_irqs(struct msi_irqs *msi);
> +
> +int msi_capability_init(struct msi_irqs *msi, int nvec);
> +int msix_capability_init(struct msi_irqs *msi, void __iomem *base,
> + struct msix_entry *entries, int nvec);
>
> struct msi_desc {
> struct {
> @@ -89,12 +101,17 @@ int arch_setup_msi_irqs(struct msi_irqs *msi, int nvec,
> int
> type);
> void arch_teardown_msi_irqs(struct msi_irqs *msi);
> int arch_msi_check_device(struct msi_irqs *msi, int nvec, int type);
> void arch_restore_msi_irqs(struct msi_irqs *msi);
> +u32 arch_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
> +u32 arch_msix_mask_irq(struct msi_desc *desc, u32 flag);
>
> void default_teardown_msi_irqs(struct msi_irqs *msi);
> void default_restore_msi_irqs(struct msi_irqs *msi);
> u32 default_msi_mask_irq(struct msi_desc *desc, u32 mask, u32 flag);
> u32 default_msix_mask_irq(struct msi_desc *desc, u32 flag);
>
> +void msi_shutdown(struct msi_irqs *msi);
> +void msix_shutdown(struct msi_irqs *msi);
> +
> #define MSI_TYPE 0x01
> #define MSIX_TYPE 0x02
>
> @@ -111,4 +128,12 @@ struct msi_chip {
> int nvec, int type);
> };
>
> +static inline __attribute_const__ u32 msi_mask(unsigned x)
> +{
> + /* Don't shift by >= width of type */
> + if (x >= 5)
> + return 0xffffffff;
> + return (1 << (1 << x)) - 1;
> +}
> +
> #endif /* LINUX_MSI_H */
> --
> 1.7.1
>
> --
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