Commit-ID: 2966d9566beb39c53477c96525820b9415de7a7d Gitweb: http://git.kernel.org/tip/2966d9566beb39c53477c96525820b9415de7a7d Author: Jiang Liu <jiang....@linux.intel.com> AuthorDate: Wed, 7 Jan 2015 15:31:35 +0800 Committer: Thomas Gleixner <t...@linutronix.de> 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....@linux.intel.com> Signed-off-by: Joerg Roedel <jroe...@suse.de> Tested-by: Joerg Roedel <j...@8bytes.org> Cc: Tony Luck <tony.l...@intel.com> Cc: io...@lists.linux-foundation.org Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org> Cc: Yinghai Lu <ying...@kernel.org> Cc: Borislav Petkov <b...@alien8.de> Link: http://lkml.kernel.org/r/1420615903-28253-9-git-send-email-jiang....@linux.intel.com Signed-off-by: Thomas Gleixner <t...@linutronix.de> --- 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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
