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From: Lu Baolu <baolu.lu@linux.intel.com>
To: Joerg Roedel <joro@8bytes.org>
Cc: iommu@lists.linux-foundation.org
Subject: [PATCH 14/19] iommu/vt-d: Cache virtual command capability register
Date: Sun,  5 Apr 2020 16:30:48 +0800	[thread overview]
Message-ID: <20200405083053.17865-15-baolu.lu@linux.intel.com> (raw)
In-Reply-To: <20200405083053.17865-1-baolu.lu@linux.intel.com>

From: Jacob Pan <jacob.jun.pan@linux.intel.com>

Virtual command registers are used in the guest only, to prevent
vmexit cost, we cache the capability and store it during initialization.

Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
---
 drivers/iommu/dmar.c        | 1 +
 include/linux/intel-iommu.h | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index a2b64f5f0372..d9dc787feef7 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -963,6 +963,7 @@ static int map_iommu(struct intel_iommu *iommu, u64 phys_addr)
 		warn_invalid_dmar(phys_addr, " returns all ones");
 		goto unmap;
 	}
+	iommu->vccap = dmar_readq(iommu->reg + DMAR_VCCAP_REG);
 
 	/* the registers might be more than one page */
 	map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap),
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 8ecb9f98bf9b..0da2f75f2f3d 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -194,6 +194,9 @@
 #define ecap_max_handle_mask(e) ((e >> 20) & 0xf)
 #define ecap_sc_support(e)	((e >> 7) & 0x1) /* Snooping Control */
 
+/* Virtual command interface capability */
+#define vccap_pasid(v)		(((v) & DMA_VCS_PAS)) /* PASID allocation */
+
 /* IOTLB_REG */
 #define DMA_TLB_FLUSH_GRANU_OFFSET  60
 #define DMA_TLB_GLOBAL_FLUSH (((u64)1) << 60)
@@ -287,6 +290,7 @@
 
 /* PRS_REG */
 #define DMA_PRS_PPR	((u32)1)
+#define DMA_VCS_PAS	((u64)1)
 
 #define IOMMU_WAIT_OP(iommu, offset, op, cond, sts)			\
 do {									\
@@ -554,6 +558,7 @@ struct intel_iommu {
 	u64		reg_size; /* size of hw register set */
 	u64		cap;
 	u64		ecap;
+	u64		vccap;
 	u32		gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */
 	raw_spinlock_t	register_lock; /* protect register handling */
 	int		seq_id;	/* sequence id of the iommu */
-- 
2.17.1

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  parent reply	other threads:[~2020-04-05  8:34 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-05  8:30 [PATCH 00/19] [PULL REQUEST] iommu/vt-d: patches for v5.7 Lu Baolu
2020-04-05  8:30 ` [PATCH 01/19] iommu: Add def_domain_type() callback in iommu_ops Lu Baolu
2020-04-05  8:30 ` [PATCH 02/19] iommu: Configure default domain with def_domain_type Lu Baolu
2020-04-05  8:30 ` [PATCH 03/19] iommu/vt-d: Don't force 32bit devices to uses DMA domain Lu Baolu
2020-04-05  8:30 ` [PATCH 04/19] iommu/vt-d: Don't force PCI sub-hierarchy to use " Lu Baolu
2020-04-05  8:30 ` [PATCH 05/19] iommu/vt-d: Add def_domain_type callback Lu Baolu
2020-04-05  8:30 ` [PATCH 06/19] iommu/vt-d: Apply per-device dma_ops Lu Baolu
2020-04-05  8:30 ` [PATCH 07/19] iommu/vt-d: Move domain helper to header Lu Baolu
2020-04-05  8:30 ` [PATCH 08/19] iommu/uapi: Define a mask for bind data Lu Baolu
2020-04-05  8:30 ` [PATCH 09/19] iommu/vt-d: Use a helper function to skip agaw for SL Lu Baolu
2020-04-05  8:30 ` [PATCH 10/19] iommu/vt-d: Add nested translation helper function Lu Baolu
2020-04-05  8:30 ` [PATCH 11/19] iommu/vt-d: Add bind guest PASID support Lu Baolu
2020-04-05  8:30 ` [PATCH 12/19] iommu/vt-d: Support flushing more translation cache types Lu Baolu
2020-04-05  8:30 ` [PATCH 13/19] iommu/vt-d: Add svm/sva invalidate function Lu Baolu
2020-04-05  8:30 ` Lu Baolu [this message]
2020-04-05  8:30 ` [PATCH 15/19] iommu/vt-d: Enlightened PASID allocation Lu Baolu
2020-04-05  8:30 ` [PATCH 16/19] iommu/vt-d: Add custom allocator for IOASID Lu Baolu
2020-04-05  8:30 ` [PATCH 17/19] iommu/vt-d: Add get_domain_info() helper Lu Baolu
2020-04-05  8:30 ` [PATCH 18/19] iommu/vt-d: Report SVA feature with generic flag Lu Baolu
2020-04-05  8:30 ` [PATCH 19/19] iommu/vt-d: Replace intel SVM APIs with generic SVA APIs Lu Baolu
2020-04-06 13:36 ` [PATCH 00/19] [PULL REQUEST] iommu/vt-d: patches for v5.7 Christoph Hellwig
2020-04-07  0:09   ` Lu Baolu

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