From: Joerg Roedel <jroe...@suse.de>
IRQ remapping is only supported when all IOMMUs in the
system support it. So check if all IOMMUs in the system
support IRQ remapping before doing the allocations.
[Jiang]
1) Rebased onto v3.19.
2) Remove redundant check of ecap_ir_support(iommu->ecap) in function
intel_enable_irq_remapping().
Signed-off-by: Joerg Roedel <jroe...@suse.de>
Signed-off-by: Jiang Liu <jiang....@linux.intel.com>
---
drivers/iommu/intel_irq_remapping.c | 19 +++++++++----------
1 file changed, 9 insertions(+), 10 deletions(-)
diff --git a/drivers/iommu/intel_irq_remapping.c
b/drivers/iommu/intel_irq_remapping.c
index 8ccc7aa7e43a..137663bd5da2 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -619,10 +619,16 @@ static int __init intel_prepare_irq_remapping(void)
goto error;
}
+ /* First make sure all IOMMUs support IRQ remapping */
for_each_iommu(iommu, drhd)
- if (!ecap_ir_support(iommu->ecap) ||
- intel_setup_irq_remapping(iommu))
+ if (!ecap_ir_support(iommu->ecap))
+ goto error;
+
+ /* Do the allocations early */
+ for_each_iommu(iommu, drhd)
+ if (intel_setup_irq_remapping(iommu))
goto error;
+
return 0;
error:
@@ -673,16 +679,12 @@ static int __init intel_enable_irq_remapping(void)
/*
* check for the Interrupt-remapping support
*/
- for_each_iommu(iommu, drhd) {
- if (!ecap_ir_support(iommu->ecap))
- continue;
-
+ for_each_iommu(iommu, drhd)
if (eim && !ecap_eim_support(iommu->ecap)) {
printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, "
" ecap %Lx\n", drhd->reg_base_addr, iommu->ecap);
goto error;
}
- }
/*
* Enable queued invalidation for all the DRHD's.
@@ -702,9 +704,6 @@ static int __init intel_enable_irq_remapping(void)
* Setup Interrupt-remapping for all the DRHD's now.
*/
for_each_iommu(iommu, drhd) {
- if (!ecap_ir_support(iommu->ecap))
- continue;
-
iommu_set_irq_remapping(iommu, eim);
setup = 1;
}
--
1.7.10.4
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
