linux-toradex.git/include/linux/msi.h, branch Colibri_T30_LinuxImageV2.1Beta2_20140206

pci: Cleanup the irq_desc mess in msi

2010-10-12T14:53:34+00:00

Handing down irq_desc to msi just so that msi can access
irq_desc.irq_data.msi_desc is a pretty stupid idea. The calling code
can hand down a pointer to msi_desc so msi code does not need to know
about the irq descriptor at all.

Signed-off-by: Thomas Gleixner 
Reviewed-by: Ingo Molnar 
Acked-by: Jesse Barnes

pci: Convert msi to new irq_chip functions

2010-10-12T14:53:34+00:00

Signed-off-by: Thomas Gleixner 
Reviewed-by: Ingo Molnar 
Acked-by: Jesse Barnes 
Cc: Benjamin Herrenschmidt 
Cc: "David S. Miller" 
Cc: Tony Luck 
Cc: Russell King

PCI: MSI: Restore read_msi_msg_desc(); add get_cached_msi_msg_desc()

2010-07-30T16:41:39+00:00

commit 2ca1af9aa3285c6a5f103ed31ad09f7399fc65d7 "PCI: MSI: Remove
unsafe and unnecessary hardware access" changed read_msi_msg_desc() to
return the last MSI message written instead of reading it from the
device, since it may be called while the device is in a reduced
power state.

However, the pSeries platform code really does need to read messages
from the device, since they are initially written by firmware.
Therefore:
- Restore the previous behaviour of read_msi_msg_desc()
- Add new functions get_cached_msi_msg{,_desc}() which return the
  last MSI message written
- Use the new functions where appropriate

Acked-by: Michael Ellerman 
Signed-off-by: Ben Hutchings 
Signed-off-by: Jesse Barnes

PCI MSI: Add support for multiple MSI

2009-03-20T17:48:14+00:00

Add the new API pci_enable_msi_block() to allow drivers to
request multiple MSI and reimplement pci_enable_msi in terms of
pci_enable_msi_block.  Ensure that the architecture back ends don't
have to know about multiple MSI.

Signed-off-by: Matthew Wilcox 
Signed-off-by: Jesse Barnes

PCI MSI: Refactor interrupt masking code

2009-03-20T17:48:13+00:00

Since most of the callers already know whether they have an MSI or
an MSI-X capability, split msi_set_mask_bits() into msi_mask_irq()
and msix_mask_irq().  The only callers which don't (mask_msi_irq()
and unmask_msi_irq()) can share code in msi_set_mask_bit().  This then
becomes the only caller of msix_flush_writes(), so we can inline it.
The flushing read can be to any address that belongs to the device,
so we can eliminate the calculation too.

We can also get rid of maskbits_mask from struct msi_desc and simply
recalculate it on the rare occasion that we need it.  The single-bit
'masked' element is replaced by a copy of the 32-bit 'masked' register,
so this patch does not affect the size of msi_desc.

Signed-off-by: Matthew Wilcox 
Signed-off-by: Jesse Barnes

PCI MSI: Use mask_pos instead of mask_base when appropriate

2009-03-20T17:48:13+00:00

MSI interrupts have a mask_pos where MSI-X have a mask_base.  Use a
transparent union to get rid of some ugly casts.

Signed-off-by: Matthew Wilcox 
Signed-off-by: Jesse Barnes

PCI MSI: Replace 'type' with 'is_msix'

2009-03-20T17:48:12+00:00

By changing from a 5-bit field to a 1-bit field, we free up some bits
that can be used by a later patch.  Also rearrange the fields for better
packing on 64-bit platforms (reducing the size of msi_desc from 72 bytes
to 64 bytes).

Signed-off-by: Matthew Wilcox 
Signed-off-by: Jesse Barnes

x86, MSI: pass irq_cfg and irq_desc

2008-12-08T13:31:59+00:00

Impact: simplify code

Pass irq_desc and cfg around, instead of raw IRQ numbers - this way
we dont have to look it up again and again.

Signed-off-by: Yinghai Lu 
Signed-off-by: Ingo Molnar

pci/irq: restore mask_bits in msi shutdown -v3

2008-04-29T16:11:12+00:00

[PATCH 1/2] pci/irq: restore mask_bits in msi shutdown -v3

Yinghai found that kexec'ing a RHEL 5.1 kernel with 2.6.25-rc3+ kernels
prevents his NIC from working.  He bisected to

| commit 89d694b9dbe769ca1004e01db0ca43964806a611
| Author: Thomas Gleixner 
| Date:   Mon Feb 18 18:25:17 2008 +0100
|
|   genirq: do not leave interupts enabled on free_irq
|
|   The default_disable() function was changed in commit:
|
|    76d2160147f43f982dfe881404cfde9fd0a9da21
|    genirq: do not mask interrupts by default
|

For MSI, default_shutdown will call mask_bit for msi device.  All mask bits
will left disabled after free_irq.  Then in the kexec case, the next kernel
can only use msi_enable bit, so all device's MSI can not be used.

So lets to restore the mask bit to its pci reset defined value (enabled) when
we disable the kernels use of msi to be a little friendlier to kexec'd kernels.

Extend msi_set_mask_bit to msi_set_mask_bits to take mask, so we can fully
restore that to 0x00 instead of 0xfe.

Signed-off-by: Yinghai Lu 
Signed-off-by: Jesse Barnes

MSI: Give archs the option to free all MSI/Xs at once.

2007-05-03T02:02:38+00:00

This patch introduces an optional function, arch_teardown_msi_irqs(),
which gives an arch the opportunity to do per-device teardown for
MSI/X. If that's not required, the default version simply calls
arch_teardown_msi_irq() for each msi irq required.

arch_teardown_msi_irqs() is simply passed a pdev, attached to the pdev
is a list of msi_descs, it is up to the arch to free the irq associated
with each of these as appropriate.

For archs that _don't_ implement arch_teardown_msi_irqs(), all msi_descs
with irq == 0 are considered unallocated, and the arch teardown routine
is not called on them.

Signed-off-by: Michael Ellerman 
Signed-off-by: Greg Kroah-Hartman