linux-kernel - [RFC 19/20] iommu/vt-d: Implement device_info iommu

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Date:   Sun, 19 Sep 2021 14:38:47 +0800
From:   Liu Yi L <yi.l.liu@...el.com>
To:     alex.williamson@...hat.com, jgg@...dia.com, hch@....de,
        jasowang@...hat.com, joro@...tes.org
Cc:     jean-philippe@...aro.org, kevin.tian@...el.com, parav@...lanox.com,
        lkml@...ux.net, pbonzini@...hat.com, lushenming@...wei.com,
        eric.auger@...hat.com, corbet@....net, ashok.raj@...el.com,
        yi.l.liu@...el.com, yi.l.liu@...ux.intel.com, jun.j.tian@...el.com,
        hao.wu@...el.com, dave.jiang@...el.com,
        jacob.jun.pan@...ux.intel.com, kwankhede@...dia.com,
        robin.murphy@....com, kvm@...r.kernel.org,
        iommu@...ts.linux-foundation.org, dwmw2@...radead.org,
        linux-kernel@...r.kernel.org, baolu.lu@...ux.intel.com,
        david@...son.dropbear.id.au, nicolinc@...dia.com
Subject: [RFC 19/20] iommu/vt-d: Implement device_info iommu_ops callback

From: Lu Baolu <baolu.lu@...ux.intel.com>

Expose per-device IOMMU attributes to the upper layers.

Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
---
 drivers/iommu/intel/iommu.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index dd22fc7d5176..d531ea44f418 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -5583,6 +5583,40 @@ static void intel_iommu_iotlb_sync_map(struct iommu_domain *domain,
 	}
 }
 
+static int
+intel_iommu_device_info(struct device *dev, enum iommu_devattr type, void *data)
+{
+	struct intel_iommu *iommu = device_to_iommu(dev, NULL, NULL);
+	int ret = 0;
+
+	if (!iommu)
+		return -ENODEV;
+
+	switch (type) {
+	case IOMMU_DEV_INFO_PAGE_SIZE:
+		*(u64 *)data = SZ_4K |
+			(cap_super_page_val(iommu->cap) & BIT(0) ? SZ_2M : 0) |
+			(cap_super_page_val(iommu->cap) & BIT(1) ? SZ_1G : 0);
+		break;
+	case IOMMU_DEV_INFO_FORCE_SNOOP:
+		/*
+		 * Force snoop is always supported in the scalable mode. For the legacy
+		 * mode, check the capability register.
+		 */
+		*(bool *)data = sm_supported(iommu) || ecap_sc_support(iommu->ecap);
+		break;
+	case IOMMU_DEV_INFO_ADDR_WIDTH:
+		*(u32 *)data = min_t(u32, agaw_to_width(iommu->agaw),
+				     cap_mgaw(iommu->cap));
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
 const struct iommu_ops intel_iommu_ops = {
 	.capable		= intel_iommu_capable,
 	.domain_alloc		= intel_iommu_domain_alloc,
@@ -5621,6 +5655,7 @@ const struct iommu_ops intel_iommu_ops = {
 	.sva_get_pasid		= intel_svm_get_pasid,
 	.page_response		= intel_svm_page_response,
 #endif
+	.device_info		= intel_iommu_device_info,
 };
 
 static void quirk_iommu_igfx(struct pci_dev *dev)
-- 
2.25.1