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

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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 <[email protected]>
Signed-off-by: Ben Hutchings <[email protected]>
Signed-off-by: Jesse Barnes <[email protected]>
This commit is contained in:
Ben Hutchings 2010-07-23 14:56:28 +01:00 • committed by Jesse Barnes
commit 30da552428
5 changed files with 47 additions and 8 deletions
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2
arch/ia64/kernel/msi_ia64.c
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@ -25,7 +25,7 @@ static int ia64_set_msi_irq_affinity(unsigned int irq,
if (irq_prepare_move(irq, cpu))
return -1;
read_msi_msg(irq, &msg);
get_cached_msi_msg(irq, &msg);
addr = msg.address_lo;
addr &= MSI_ADDR_DEST_ID_MASK;

2
arch/ia64/sn/kernel/msi_sn.c
View file

@ -175,7 +175,7 @@ static int sn_set_msi_irq_affinity(unsigned int irq,
* Release XIO resources for the old MSI PCI address
*/
read_msi_msg(irq, &msg);
get_cached_msi_msg(irq, &msg);
sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
pdev = sn_pdev->pdi_linux_pcidev;
provider = SN_PCIDEV_BUSPROVIDER(pdev);