Commit-ID: 2966d9566beb39c53477c96525820b9415de7a7d
Gitweb: http://git.kernel.org/tip/2966d9566beb39c53477c96525820b9415de7a7d
Author: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
AuthorDate: Wed, 7 Jan 2015 15:31:35 +0800
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Thu, 15 Jan 2015 11:24:23 +0100
iommu/vt-d: Prepare for killing function irq_remapping_supported()
Prepare for killing function irq_remapping_supported() by moving code
from intel_irq_remapping_supported() into intel_prepare_irq_remapping().
Combined with patch from Joerg at https://lkml.org/lkml/2014/12/15/487,
so assume an signed-off from Joerg.
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Tested-by: Joerg Roedel <joro@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Link: http://lkml.kernel.org/r/1420615903-28253-9-git-send-email-jiang.liu@xxxxxxxxxxxxxxx
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
drivers/iommu/intel_irq_remapping.c | 58 ++++++++++++++++---------------------
1 file changed, 25 insertions(+), 33 deletions(-)
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 1e7e093..8ccc7aa 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -568,30 +568,6 @@ static int __init dmar_x2apic_optout(void)
static int __init intel_irq_remapping_supported(void)
{
- struct dmar_drhd_unit *drhd;
- struct intel_iommu *iommu;
-
- if (disable_irq_remap)
- return 0;
- if (irq_remap_broken) {
- printk(KERN_WARNING
- "This system BIOS has enabled interrupt remapping\n"
- "on a chipset that contains an erratum making that\n"
- "feature unstable. To maintain system stability\n"
- "interrupt remapping is being disabled. Please\n"
- "contact your BIOS vendor for an update\n");
- add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
- disable_irq_remap = 1;
- return 0;
- }
-
- if (!dmar_ir_support())
- return 0;
-
- for_each_iommu(iommu, drhd)
- if (!ecap_ir_support(iommu->ecap))
- return 0;
-
return 1;
}
@@ -616,26 +592,42 @@ static int __init intel_prepare_irq_remapping(void)
struct dmar_drhd_unit *drhd;
struct intel_iommu *iommu;
+ /* First check whether IRQ remapping should be enabled */
+ if (disable_irq_remap)
+ return -ENODEV;
+
+ if (irq_remap_broken) {
+ printk(KERN_WARNING
+ "This system BIOS has enabled interrupt remapping\n"
+ "on a chipset that contains an erratum making that\n"
+ "feature unstable. To maintain system stability\n"
+ "interrupt remapping is being disabled. Please\n"
+ "contact your BIOS vendor for an update\n");
+ add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
+ disable_irq_remap = 1;
+ return -ENODEV;
+ }
+
if (dmar_table_init() < 0)
- return -1;
+ return -ENODEV;
+
+ if (!dmar_ir_support())
+ return -ENODEV;
if (parse_ioapics_under_ir() != 1) {
printk(KERN_INFO "Not enabling interrupt remapping\n");
goto error;
}
- for_each_iommu(iommu, drhd) {
- if (!ecap_ir_support(iommu->ecap))
- continue;
-
- /* Do the allocations early */
- if (intel_setup_irq_remapping(iommu))
+ for_each_iommu(iommu, drhd)
+ if (!ecap_ir_support(iommu->ecap) ||
+ intel_setup_irq_remapping(iommu))
goto error;
- }
return 0;
+
error:
intel_cleanup_irq_remapping();
- return -1;
+ return -ENODEV;
}
static int __init intel_enable_irq_remapping(void)
--
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