From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751809AbaKJGgd (ORCPT ); Mon, 10 Nov 2014 01:36:33 -0500 Received: from mga11.intel.com ([192.55.52.93]:54478 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750850AbaKJGgb (ORCPT ); Mon, 10 Nov 2014 01:36:31 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,351,1413270000"; d="scan'208";a="629364112" From: Feng Wu To: gleb@kernel.org, pbonzini@redhat.com, dwmw2@infradead.org, joro@8bytes.org, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, x86@kernel.org Cc: kvm@vger.kernel.org, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, Feng Wu Subject: [PATCH 01/13] iommu/vt-d: VT-d Posted-Interrupts feature detection Date: Mon, 10 Nov 2014 14:26:40 +0800 Message-Id: <1415600812-27773-2-git-send-email-feng.wu@intel.com> X-Mailer: git-send-email 1.7.1 In-Reply-To: <1415600812-27773-1-git-send-email-feng.wu@intel.com> References: <1415600812-27773-1-git-send-email-feng.wu@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org VT-d Posted-Interrupts is an enhancement to CPU side Posted-Interrupt. With VT-d Posted-Interrupts enabled, external interrupts from direct-assigned devices can be delivered to guests without VMM intervention when guest is running in non-root mode. This patch adds feature detection logic for VT-d posted-interrupt. Signed-off-by: Feng Wu --- drivers/iommu/intel_irq_remapping.c | 13 +++++++++++++ drivers/iommu/irq_remapping.c | 4 ++++ drivers/iommu/irq_remapping.h | 5 +++++ include/linux/intel-iommu.h | 1 + 4 files changed, 23 insertions(+), 0 deletions(-) diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c index 7c80661..f99f0f1 100644 --- a/drivers/iommu/intel_irq_remapping.c +++ b/drivers/iommu/intel_irq_remapping.c @@ -580,6 +580,19 @@ static int __init intel_irq_remapping_supported(void) if (!ecap_ir_support(iommu->ecap)) return 0; + /* VT-d posted-interrupt feature detection*/ + if (disable_irq_post == 0) + for_each_drhd_unit(drhd) { + struct intel_iommu *iommu = drhd->iommu; + + if (!cap_pi_support(iommu->cap)) { + irq_post_enabled = 0; + disable_irq_post = 1; + break; + } + irq_post_enabled = 1; + } + return 1; } diff --git a/drivers/iommu/irq_remapping.c b/drivers/iommu/irq_remapping.c index 74a1767..2f8ee00 100644 --- a/drivers/iommu/irq_remapping.c +++ b/drivers/iommu/irq_remapping.c @@ -23,6 +23,10 @@ int irq_remap_broken; int disable_sourceid_checking; int no_x2apic_optout; +int disable_irq_post = 1; +int irq_post_enabled = 0; +EXPORT_SYMBOL_GPL(irq_post_enabled); + static struct irq_remap_ops *remap_ops; static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec); diff --git a/drivers/iommu/irq_remapping.h b/drivers/iommu/irq_remapping.h index fde250f..7bb5913 100644 --- a/drivers/iommu/irq_remapping.h +++ b/drivers/iommu/irq_remapping.h @@ -37,6 +37,9 @@ extern int disable_sourceid_checking; extern int no_x2apic_optout; extern int irq_remapping_enabled; +extern int disable_irq_post; +extern int irq_post_enabled; + struct irq_remap_ops { /* Check whether Interrupt Remapping is supported */ int (*supported)(void); @@ -91,6 +94,8 @@ extern struct irq_remap_ops amd_iommu_irq_ops; #define irq_remapping_enabled 0 #define disable_irq_remap 1 #define irq_remap_broken 0 +#define disable_irq_post 1 +#define irq_post_enabled 0 #endif /* CONFIG_IRQ_REMAP */ diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index a65208a..5b1a124 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -87,6 +87,7 @@ static inline void dmar_writeq(void __iomem *addr, u64 val) /* * Decoding Capability Register */ +#define cap_pi_support(c) (((c) >> 59) & 1) #define cap_read_drain(c) (((c) >> 55) & 1) #define cap_write_drain(c) (((c) >> 54) & 1) #define cap_max_amask_val(c) (((c) >> 48) & 0x3f) -- 1.7.1