On 2014/11/13 20:39, Jiang Liu wrote:
>
>
> On 2014/11/13 20:28, Yijing Wang wrote:
>> On 2014/11/13 19:43, Jiang Liu wrote:
>>> This patch set is based on tip/irq/irqdomain and tries to refine
>>> interfaces to support irqdomain for generic MSI and PCI MSI.
>>>
>>> Patch 1 is just minor fixes for tip/irq/irqdomain.
>>>
>>> Patch 2 introduces some helpers to hide struct msi_desc implementation
>>> details, so later we could move msi_list from struct pci_dev into
>>> struct device to enable generic MSI support.
>>
>> Hi Gerry,
>> I tried to move msi info(eg. msi_list) into struct device, but I found
>> DMAR fault interrupt is initialized before the driver core init. And I don't
>> know whether there are other devices like ARM consolidator(introduced in GIC v3)
>> need to be initialized before driver core. What do you think about this ?
> Hi Yijing,
> DMAR interrupt doesn't make use of msi_desc, so has no
> dependency on msi_list.
OK, I thought we could use msi_desc to describe DMAR/HPET irq, so they could
share the mask/unmask, write_msg/read_etc.. But maybe it's not a right direction. :)
> Actually there are two levels of generic MSI sharing. The first
> level is to share common irq_chip/irqdomain code, such as HPET, DMAR and
> HT_IRQ. The second level is to share msi_desc, such as some device
> on ARM side as you have mentioned.
> With this patch set applied, we achieve level one sharing. For
> level two sharing, we need to move msi_list into struct device, refactor
> struct msi_desc, and provide a generic pci_enable_msix_range alike
> user interfaces. I'm still working on this part, so we could cooperate
> with each other.
That's good :)
> Thanks!
> Gerry
>
>>
>> Thanks!
>> Yijing.
>>
>>>
>>> Patch 3 introduces msi_domain_{alloc|free}_irqs() which generalize
>>> pci_msi_domain_alloc_irqs() to support generic MSI.
>>>
>>> Patch 4 introduces default data structures and callback implementations
>>> to support msi_domain_alloc_irqs(), so reduce burden on generic MSI
>>> users.
>>>
>>> Patch 5 converts PCI MSI to use generic MSI interfaces, and also
>>> implement default callbacks for PCI MSI.
>>>
>>> Patch 6 introduces a mechanism to replace arch_setup_msi_irq()/
>>> arch_setup_msi_irqs()/arch_teardown_msi_irq()/arch_teardown_msi_irqs().
>>>
>>> With this patch set applied, the generic MSI and PCI MSI interfaces
>>> are much easier to use. For extreme case, you only need to define
>>> a "struct msi_domain_info" and don't need to implement any callbacks,
>>> just using the default callbacks is OK:)
>>>
>>> This patch set is also a preparation for:
>>> 1) Kill all weak functions in drivers/pci/msi.c
>>> 2) Implement support for non-PCI-compliant MSI device
>>>
>>> It has been tested on x86 platforms, comments are welcomed!
>>>
>>> Jiang Liu (6):
>>> PCI, MSI: Fix errors caused by commit e5f1a59c4e12
>>> PCI, MSI: Introduce helpers to hide struct msi_desc implemenation
>>> details
>>> genirq: Introduce msi_domain_{alloc|free}_irqs()
>>> genirq: Provide default callbacks for msi_domain_ops
>>> PCI, MSI: Refine irqdomain interfaces to simplify its usage
>>> PCI, MSI: Provide mechanism to alloc/free MSI/MSIX interrupt from
>>> irqdomain
>>>
>>> drivers/pci/msi.c | 170 ++++++++++++++++++++++++++++++++++++++++-----------
>>> include/linux/msi.h | 90 ++++++++++++++++++++++++---
>>> kernel/irq/msi.c | 150 ++++++++++++++++++++++++++++++++++++++++++++-
>>> 3 files changed, 366 insertions(+), 44 deletions(-)
>>>
>>
>>
>
> .
>
--
Thanks!
Yijing
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