[PATCH v1 21/21] PCI/MSI: Clean up unused MSI arch functions
Yijing Wang
wangyijing at huawei.com
Tue Sep 16 12:09:39 EST 2014
On 2014/9/15 22:47, Lucas Stach wrote:
> Am Freitag, den 05.09.2014, 18:10 +0800 schrieb Yijing Wang:
>> Now we use struct msi_chip in all platforms to configure
>> MSI/MSI-X. We can clean up the unused arch functions.
>>
>> Signed-off-by: Yijing Wang <wangyijing at huawei.com>
>
> Reviewed-by: Lucas Stach <l.stach at pengutronix.de>
Thanks!
>
>> ---
>> drivers/iommu/irq_remapping.c | 2 +-
>> drivers/pci/msi.c | 99 ++++++++++++++++-------------------------
>> include/linux/msi.h | 14 ------
>> 3 files changed, 39 insertions(+), 76 deletions(-)
>>
>> diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c
>> index 99b1c0f..6e645f0 100644
>> --- a/drivers/iommu/irq_remapping.c
>> +++ b/drivers/iommu/irq_remapping.c
>> @@ -92,7 +92,7 @@ error:
>>
>> /*
>> * Restore altered MSI descriptor fields and prevent just destroyed
>> - * IRQs from tearing down again in default_teardown_msi_irqs()
>> + * IRQs from tearing down again in teardown_msi_irqs()
>> */
>> msidesc->irq = 0;
>> msidesc->nvec_used = 0;
>> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
>> index d78d637..e3e7f4f 100644
>> --- a/drivers/pci/msi.c
>> +++ b/drivers/pci/msi.c
>> @@ -34,50 +34,31 @@ struct msi_chip * __weak arch_find_msi_chip(struct pci_dev *dev)
>> return dev->bus->msi;
>> }
>>
>> -int __weak arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
>> -{
>> - struct msi_chip *chip = arch_find_msi_chip(dev);
>> - int err;
>> -
>> - if (!chip || !chip->setup_irq)
>> - return -EINVAL;
>> -
>> - err = chip->setup_irq(dev, desc);
>> - if (err < 0)
>> - return err;
>> -
>> - 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(irq);
>> -}
>> -
>> -int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
>> +int setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
>> {
>> struct msi_desc *entry;
>> int ret;
>> struct msi_chip *chip;
>>
>> chip = arch_find_msi_chip(dev);
>> - if (chip && chip->setup_irqs)
>> + if (!chip)
>> + return -EINVAL;
>> +
>> + if (chip->setup_irqs)
>> return chip->setup_irqs(dev, nvec, type);
>>
>> /*
>> * If an architecture wants to support multiple MSI, it needs to
>> - * override arch_setup_msi_irqs()
>> + * implement chip->setup_irqs().
>> */
>> if (type == PCI_CAP_ID_MSI && nvec > 1)
>> return 1;
>>
>> + if (!chip->setup_irq)
>> + return -EINVAL;
>> +
>> list_for_each_entry(entry, &dev->msi_list, list) {
>> - ret = arch_setup_msi_irq(dev, entry);
>> + ret = chip->setup_irq(dev, entry);
>> if (ret < 0)
>> return ret;
>> if (ret > 0)
>> @@ -87,13 +68,20 @@ int __weak arch_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
>> 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 pci_dev *dev)
>> +static void teardown_msi_irqs(struct pci_dev *dev)
>> {
>> struct msi_desc *entry;
>> + struct msi_chip *chip;
>> +
>> + chip = arch_find_msi_chip(dev);
>> + if (!chip)
>> + return;
>> +
>> + if (chip->teardown_irqs)
>> + return chip->teardown_irqs(dev);
>> +
>> + if (!chip->teardown_irq)
>> + return;
>>
>> list_for_each_entry(entry, &dev->msi_list, list) {
>> int i, nvec;
>> @@ -104,20 +92,10 @@ void default_teardown_msi_irqs(struct pci_dev *dev)
>> else
>> nvec = 1 << entry->msi_attrib.multiple;
>> for (i = 0; i < nvec; i++)
>> - arch_teardown_msi_irq(entry->irq + i);
>> + chip->teardown_irq(entry->irq + i);
>> }
>> }
>>
>> -void __weak arch_teardown_msi_irqs(struct pci_dev *dev)
>> -{
>> - struct msi_chip *chip = arch_find_msi_chip(dev);
>> -
>> - if (chip && chip->teardown_irqs)
>> - return chip->teardown_irqs(dev);
>> -
>> - return default_teardown_msi_irqs(dev);
>> -}
>> -
>> static void default_restore_msi_irq(struct pci_dev *dev, int irq)
>> {
>> struct msi_desc *entry;
>> @@ -136,10 +114,18 @@ static void default_restore_msi_irq(struct pci_dev *dev, int irq)
>> write_msi_msg(irq, &entry->msg);
>> }
>>
>> -void __weak arch_restore_msi_irqs(struct pci_dev *dev)
>> +static void default_restore_msi_irqs(struct pci_dev *dev)
>> {
>> - struct msi_chip *chip = arch_find_msi_chip(dev);
>> + struct msi_desc *entry = NULL;
>> +
>> + list_for_each_entry(entry, &dev->msi_list, list) {
>> + default_restore_msi_irq(dev, entry->irq);
>> + }
>> +}
>>
>> +static void restore_msi_irqs(struct pci_dev *dev)
>> +{
>> + struct msi_chip *chip = arch_find_msi_chip(dev);
>> if (chip && chip->restore_irqs)
>> return chip->restore_irqs(dev);
>>
>> @@ -248,15 +234,6 @@ void unmask_msi_irq(struct irq_data *data)
>> msi_set_mask_bit(data, 0);
>> }
>>
>> -void default_restore_msi_irqs(struct pci_dev *dev)
>> -{
>> - struct msi_desc *entry;
>> -
>> - list_for_each_entry(entry, &dev->msi_list, list) {
>> - default_restore_msi_irq(dev, entry->irq);
>> - }
>> -}
>> -
>> void read_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
>> {
>> BUG_ON(entry->dev->current_state != PCI_D0);
>> @@ -360,7 +337,7 @@ static void free_msi_irqs(struct pci_dev *dev)
>> BUG_ON(irq_has_action(entry->irq + i));
>> }
>>
>> - arch_teardown_msi_irqs(dev);
>> + teardown_msi_irqs(dev);
>>
>> list_for_each_entry_safe(entry, tmp, &dev->msi_list, list) {
>> if (entry->msi_attrib.is_msix) {
>> @@ -430,7 +407,7 @@ static void __pci_restore_msi_state(struct pci_dev *dev)
>>
>> pci_intx_for_msi(dev, 0);
>> msi_set_enable(dev, 0);
>> - arch_restore_msi_irqs(dev);
>> + restore_msi_irqs(dev);
>>
>> pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &control);
>> msi_mask_irq(entry, msi_mask(entry->msi_attrib.multi_cap),
>> @@ -453,7 +430,7 @@ static void __pci_restore_msix_state(struct pci_dev *dev)
>> msix_clear_and_set_ctrl(dev, 0,
>> PCI_MSIX_FLAGS_ENABLE | PCI_MSIX_FLAGS_MASKALL);
>>
>> - arch_restore_msi_irqs(dev);
>> + restore_msi_irqs(dev);
>> list_for_each_entry(entry, &dev->msi_list, list) {
>> msix_mask_irq(entry, entry->masked);
>> }
>> @@ -624,7 +601,7 @@ static int msi_capability_init(struct pci_dev *dev, int nvec)
>> list_add_tail(&entry->list, &dev->msi_list);
>>
>> /* Configure MSI capability structure */
>> - ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
>> + ret = setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSI);
>> if (ret) {
>> msi_mask_irq(entry, mask, ~mask);
>> free_msi_irqs(dev);
>> @@ -740,7 +717,7 @@ static int msix_capability_init(struct pci_dev *dev,
>> if (ret)
>> return ret;
>>
>> - ret = arch_setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
>> + ret = setup_msi_irqs(dev, nvec, PCI_CAP_ID_MSIX);
>> if (ret)
>> goto out_avail;
>>
>> diff --git a/include/linux/msi.h b/include/linux/msi.h
>> index 92a51e7..d6e1f7c 100644
>> --- a/include/linux/msi.h
>> +++ b/include/linux/msi.h
>> @@ -51,20 +51,6 @@ struct msi_desc {
>> struct kobject kobj;
>> };
>>
>> -/*
>> - * The arch hooks to setup up msi irqs. Those functions are
>> - * implemented as weak symbols so that they /can/ be overriden by
>> - * architecture specific code if needed.
>> - */
>> -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);
>> -void arch_restore_msi_irqs(struct pci_dev *dev);
>> -
>> -void default_teardown_msi_irqs(struct pci_dev *dev);
>> -void default_restore_msi_irqs(struct pci_dev *dev);
>> -
>> struct msi_chip {
>> struct module *owner;
>> struct device *dev;
>
--
Thanks!
Yijing
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