Re: [PATCH v1 21/21] PCI/MSI: Clean up unused MSI arch functions

From: Yijing Wang <wangyijing@huawei.com>
To: Lucas Stach <l.stach@pengutronix.de>
Cc: linux-mips@linux-mips.org, linux-ia64@vger.kernel.org,
	linux-pci@vger.kernel.org, Bharat.Bhushan@freescale.com,
	sparclinux@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-s390@vger.kernel.org, Russell King <linux@arm.linux.org.uk>,
	Joerg Roedel <joro@8bytes.org>,
	x86@kernel.org, Sebastian Ott <sebott@linux.vnet.ibm.com>,
	xen-devel@lists.xenproject.org, arnab.basu@freescale.com,
	Arnd Bergmann <arnd@arndb.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	Chris Metcalf <cmetcalf@tilera.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel@lists.infradead.org,
	Xinwei Hu <huxinwei@huawei.com>, Tony Luck <tony.luck@intel.com>,
	Ralf Baechle <ralf@linux-mips.org>,
	iommu@lists.linux-foundation.org, Wuyun <wuyun.wu@huawei.com>,
	linuxppc-dev@lists.ozlabs.org,
	"David S. Miller" <davem@davemloft.net>
Subject: Re: [PATCH v1 21/21] PCI/MSI: Clean up unused MSI arch functions
Date: Tue, 16 Sep 2014 10:09:39 +0800	[thread overview]
Message-ID: <54179BE3.5030303@huawei.com> (raw)
In-Reply-To: <1410792430.3314.10.camel@pengutronix.de>

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@huawei.com>
> 
> Reviewed-by: Lucas Stach <l.stach@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