diff options
| author | Fenghua Yu <fenghua.yu@intel.com> | 2009-03-27 14:22:44 -0700 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-04-03 21:45:59 +0100 |
| commit | b24696bc55f66fecc30715e003f10fc2555a9271 (patch) | |
| tree | 3ef565bf041a06106a73d0b27ccc256845ef5644 /drivers/pci | |
| parent | eb4a52bc660ea835482c582eaaf4893742cbd160 (diff) | |
| download | kernel_samsung_smdk4412-b24696bc55f66fecc30715e003f10fc2555a9271.tar.gz kernel_samsung_smdk4412-b24696bc55f66fecc30715e003f10fc2555a9271.tar.bz2 kernel_samsung_smdk4412-b24696bc55f66fecc30715e003f10fc2555a9271.zip | |
Intel IOMMU Suspend/Resume Support - Interrupt Remapping
This patch enables suspend/resume for interrupt remapping. During suspend,
interrupt remapping is disabled. When resume, interrupt remapping is enabled
again.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/intr_remapping.c | 61 |
1 files changed, 59 insertions, 2 deletions
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c index b041a409f4a..c26633d7e7d 100644 --- a/drivers/pci/intr_remapping.c +++ b/drivers/pci/intr_remapping.c @@ -470,7 +470,7 @@ static int setup_intr_remapping(struct intel_iommu *iommu, int mode) /* * Disable Interrupt Remapping. */ -static void disable_intr_remapping(struct intel_iommu *iommu) +static void iommu_disable_intr_remapping(struct intel_iommu *iommu) { unsigned long flags; u32 sts; @@ -478,6 +478,12 @@ static void disable_intr_remapping(struct intel_iommu *iommu) if (!ecap_ir_support(iommu->ecap)) return; + /* + * global invalidation of interrupt entry cache before disabling + * interrupt-remapping. + */ + qi_global_iec(iommu); + spin_lock_irqsave(&iommu->register_lock, flags); sts = dmar_readq(iommu->reg + DMAR_GSTS_REG); @@ -511,7 +517,7 @@ int __init enable_intr_remapping(int eim) * Disable intr remapping and queued invalidation, if already * enabled prior to OS handover. */ - disable_intr_remapping(iommu); + iommu_disable_intr_remapping(iommu); dmar_disable_qi(iommu); } @@ -639,3 +645,54 @@ int __init parse_ioapics_under_ir(void) return ir_supported; } + +void disable_intr_remapping(void) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu = NULL; + + /* + * Disable Interrupt-remapping for all the DRHD's now. + */ + for_each_iommu(iommu, drhd) { + if (!ecap_ir_support(iommu->ecap)) + continue; + + iommu_disable_intr_remapping(iommu); + } +} + +int reenable_intr_remapping(int eim) +{ + struct dmar_drhd_unit *drhd; + int setup = 0; + struct intel_iommu *iommu = NULL; + + for_each_iommu(iommu, drhd) + if (iommu->qi) + dmar_reenable_qi(iommu); + + /* + * Setup Interrupt-remapping for all the DRHD's now. + */ + for_each_iommu(iommu, drhd) { + if (!ecap_ir_support(iommu->ecap)) + continue; + + /* Set up interrupt remapping for iommu.*/ + iommu_set_intr_remapping(iommu, eim); + setup = 1; + } + + if (!setup) + goto error; + + return 0; + +error: + /* + * handle error condition gracefully here! + */ + return -1; +} + |