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authorJiang Liu <jiang.liu@linux.intel.com>2015-01-07 10:31:37 +0300
committerThomas Gleixner <tglx@linutronix.de>2015-01-15 13:24:23 +0300
commit13d09b6603df9df3aa3e410bc2a876889a55c744 (patch)
tree3a5b5d01404d18a942735eb8caf028290a30ed89 /drivers/iommu
parent69cf1d8a1286a7bfbeec497b69c43cc7ebb2a787 (diff)
downloadlinux-13d09b6603df9df3aa3e410bc2a876889a55c744.tar.xz
iommu/vt-d: Allow IR works in XAPIC mode though CPU works in X2APIC mode
Currently if CPU supports X2APIC, IR hardware must work in X2APIC mode or disabled. Change the code to support IR working in XAPIC mode when CPU supports X2APIC. Then the CPU APIC driver will decide how to handle such as configuration by: 1) Disabling X2APIC mode 2) Forcing X2APIC physical mode This change also fixes a live locking when 1) BIOS enables CPU X2APIC 2) DMAR table disables X2APIC mode or IR hardware doesn't support X2APIC with following messages: [ 37.863463] dmar: INTR-REMAP: Request device [[f0:1f.7] fault index 2 [ 37.863463] INTR-REMAP:[fault reason 36] Detected reserved fields in the IRTE entry [ 37.879372] dmar: INTR-REMAP: Request device [[f0:1f.7] fault index 2 [ 37.879372] INTR-REMAP:[fault reason 36] Detected reserved fields in the IRTE entry [ 37.895282] dmar: INTR-REMAP: Request device [[f0:1f.7] fault index 2 [ 37.895282] INTR-REMAP:[fault reason 36] Detected reserved fields in the IRTE entry [ 37.911192] dmar: INTR-REMAP: Request device [[f0:1f.7] fault index 2 Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Tested-by: Joerg Roedel <joro@8bytes.org> Cc: Tony Luck <tony.luck@intel.com> Cc: iommu@lists.linux-foundation.org Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Link: http://lkml.kernel.org/r/1420615903-28253-11-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel_irq_remapping.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index 137663bd5da2..9d67c12c2ffb 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -32,8 +32,9 @@ struct hpet_scope {
};
#define IR_X2APIC_MODE(mode) (mode ? (1 << 11) : 0)
-#define IRTE_DEST(dest) ((x2apic_mode) ? dest : dest << 8)
+#define IRTE_DEST(dest) ((eim_mode) ? dest : dest << 8)
+static int __read_mostly eim_mode;
static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
static struct hpet_scope ir_hpet[MAX_HPET_TBS];
@@ -644,8 +645,6 @@ static int __init intel_enable_irq_remapping(void)
int eim = 0;
if (x2apic_supported()) {
- pr_info("Queued invalidation will be enabled to support x2apic and Intr-remapping.\n");
-
eim = !dmar_x2apic_optout();
if (!eim)
printk(KERN_WARNING
@@ -683,8 +682,11 @@ static int __init intel_enable_irq_remapping(void)
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;
+ eim = 0;
}
+ eim_mode = eim;
+ if (eim)
+ pr_info("Queued invalidation will be enabled to support x2apic and Intr-remapping.\n");
/*
* Enable queued invalidation for all the DRHD's.