linux-stable.git/include/linux/msi.h, branch v5.13.2

PCI/MSI: Kill default_teardown_msi_irqs()

2021-04-20T13:11:22+00:00

It doesn't have any caller left.

Link: https://lore.kernel.org/r/20210330151145.997953-10-maz@kernel.org
Signed-off-by: Marc Zyngier 
Signed-off-by: Lorenzo Pieralisi 
Acked-by: Bjorn Helgaas

PCI/MSI: Kill msi_controller structure

2021-04-20T13:11:22+00:00

msi_controller had a good, long life as the abstraction for
a driver providing MSIs to PCI devices. But it has been replaced
in all drivers by the more expressive generic MSI framework.

Farewell, struct msi_controller.

Link: https://lore.kernel.org/r/20210330151145.997953-9-maz@kernel.org
Signed-off-by: Marc Zyngier 
Signed-off-by: Lorenzo Pieralisi 
Acked-by: Bjorn Helgaas

genirq/msi: Activate Multi-MSI early when MSI_FLAG_ACTIVATE_EARLY is set

2021-01-30T00:22:31+00:00

When MSI_FLAG_ACTIVATE_EARLY is set (which is the case for PCI),
__msi_domain_alloc_irqs() performs the activation of the interrupt (which
in the case of PCI results in the endpoint being programmed) as soon as the
interrupt is allocated.

But it appears that this is only done for the first vector, introducing an
inconsistent behaviour for PCI Multi-MSI.

Fix it by iterating over the number of vectors allocated to each MSI
descriptor. This is easily achieved by introducing a new
"for_each_msi_vector" iterator, together with a tiny bit of refactoring.

Fixes: f3b0946d629c ("genirq/msi: Make sure PCI MSIs are activated early")
Reported-by: Shameer Kolothum 
Signed-off-by: Marc Zyngier 
Signed-off-by: Thomas Gleixner 
Tested-by: Shameer Kolothum 
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210123122759.1781359-1-maz@kernel.org

genirq/msi: Allow shadow declarations of msi_msg:: $member

2020-10-28T19:26:25+00:00

Architectures like x86 have their MSI messages in various bits of the data,
address_lo and address_hi field. Composing or decomposing these messages
with bitmasks and shifts is possible, but unreadable gunk.

Allow architectures to provide an architecture specific representation for
each member of msi_msg. Provide empty defaults for each and stick them into
an union.

Signed-off-by: Thomas Gleixner 
Signed-off-by: David Woodhouse 
Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/r/20201024213535.443185-12-dwmw2@infradead.org

PCI/MSI: Make arch_.*_msi_irq[s] fallbacks selectable

2020-09-16T14:52:37+00:00

The arch_.*_msi_irq[s] fallbacks are compiled in whether an architecture
requires them or not. Architectures which are fully utilizing hierarchical
irq domains should never call into that code.

It's not only architectures which depend on that by implementing one or
more of the weak functions, there is also a bunch of drivers which relies
on the weak functions which invoke msi_controller::setup_irq[s] and
msi_controller::teardown_irq.

Make the architectures and drivers which rely on them select them in Kconfig
and if not selected replace them by stub functions which emit a warning and
fail the PCI/MSI interrupt allocation.

Signed-off-by: Thomas Gleixner 
Link: https://lore.kernel.org/r/20200826112333.992429909@linutronix.de

irqdomain/msi: Allow to override msi_domain_alloc/free_irqs()

2020-09-16T14:52:37+00:00

To support MSI irq domains which do not fit at all into the regular MSI
irqdomain scheme, like the XEN MSI interrupt management for PV/HVM/DOM0,
it's necessary to allow to override the alloc/free implementation.

This is a preperatory step to switch X86 away from arch_*_msi_irqs() and
store the irq domain pointer right in struct device.

No functional change for existing MSI irq domain users.

Aside of the evil XEN wrapper this is also useful for special MSI domains
which need to do extra alloc/free work before/after calling the generic
core function. Work like allocating/freeing MSI descriptors, MSI storage
space etc.

Signed-off-by: Thomas Gleixner 
Reviewed-by: Marc Zyngier 
Link: https://lore.kernel.org/r/20200826112333.526797548@linutronix.de

PCI/MSI: Provide pci_dev_has_special_msi_domain() helper

2020-09-16T14:52:36+00:00

Provide a helper function to check whether a PCI device is handled by a
non-standard PCI/MSI domain. This will be used to exclude such devices
which hang of a special bus, e.g. VMD, to be excluded from the irq domain
override in irq remapping.

Signed-off-by: Thomas Gleixner 
Acked-by: Bjorn Helgaas 
Link: https://lore.kernel.org/r/20200826112333.139387358@linutronix.de

x86/msi: Use generic MSI domain ops

2020-09-16T14:52:35+00:00

pci_msi_get_hwirq() and pci_msi_set_desc are not longer special. Enable the
generic MSI domain ops in the core and PCI MSI code unconditionally and get
rid of the x86 specific implementations in the X86 MSI code and in the
hyperv PCI driver.

Signed-off-by: Thomas Gleixner 
Reviewed-by: Marc Zyngier 
Link: https://lore.kernel.org/r/20200826112332.564274859@linutronix.de

PCI/MSI: Rework pci_msi_domain_calc_hwirq()

2020-09-16T14:52:34+00:00

Retrieve the PCI device from the msi descriptor instead of doing so at the
call sites.

Signed-off-by: Thomas Gleixner 
Acked-by: Bjorn Helgaas 
Acked-by: Marc Zyngier 
Link: https://lore.kernel.org/r/20200826112332.352583299@linutronix.de

PCI/MSI: Support allocating virtual MSI interrupts

2019-06-13T12:59:34+00:00

For NTB devices, we want to be able to trigger MSI interrupts
through a memory window. In these cases we may want to use
more interrupts than the NTB PCI device has available in its MSI-X
table.

We allow for this by creating a new 'virtual' interrupt. These
interrupts are allocated as usual but are not programmed into the
MSI-X table (as there may not be space for them).

The MSI address and data will then handled through an NTB MSI library
introduced later in this series.

Signed-off-by: Logan Gunthorpe 
Acked-by: Bjorn Helgaas 
Signed-off-by: Jon Mason