[PATCH v4 15/28] x86/vvtd: Enable Queued Invalidation through GCMD

[Chao Gao <chao.gao@intel.com>]

Software writes to QIE field of GCMD to enable or disable queued
invalidations. This patch emulates QIE field of GCMD.

Signed-off-by: Chao Gao <chao.gao@intel.com>
Signed-off-by: Lan Tianyu <tianyu.lan@intel.com>
---
 xen/drivers/passthrough/vtd/iommu.h |  3 ++-
 xen/drivers/passthrough/vtd/vvtd.c  | 18 ++++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/vtd/iommu.h b/xen/drivers/passthrough/vtd/iommu.h
index dc2df75..b71dab8 100644
--- a/xen/drivers/passthrough/vtd/iommu.h
+++ b/xen/drivers/passthrough/vtd/iommu.h
@@ -160,7 +160,8 @@
 #define DMA_GSTS_FLS    (((u64)1) << 29)
 #define DMA_GSTS_AFLS   (((u64)1) << 28)
 #define DMA_GSTS_WBFS   (((u64)1) << 27)
-#define DMA_GSTS_QIES   (((u64)1) <<26)
+#define DMA_GSTS_QIES_SHIFT     26
+#define DMA_GSTS_QIES   (((u64)1) << DMA_GSTS_QIES_SHIFT)
 #define DMA_GSTS_IRES_SHIFT     25
 #define DMA_GSTS_IRES   (((u64)1) << DMA_GSTS_IRES_SHIFT)
 #define DMA_GSTS_SIRTPS_SHIFT   24
diff --git a/xen/drivers/passthrough/vtd/vvtd.c b/xen/drivers/passthrough/vtd/vvtd.c
index 83805d1..a2fa64a 100644
--- a/xen/drivers/passthrough/vtd/vvtd.c
+++ b/xen/drivers/passthrough/vtd/vvtd.c
@@ -539,6 +539,20 @@ static void write_gcmd_ire(struct vvtd *vvtd, uint32_t val)
         (vvtd, DMAR_GSTS_REG, DMA_GSTS_IRES_SHIFT);
 }
 
+static void write_gcmd_qie(struct vvtd *vvtd, uint32_t val)
+{
+    bool set = val & DMA_GCMD_QIE;
+
+    vvtd_info("%sable Queue Invalidation\n", set ? "En" : "Dis");
+
+    if ( set )
+        vvtd_set_reg_quad(vvtd, DMAR_IQH_REG, 0);
+
+    (set ? vvtd_set_bit : vvtd_clear_bit)
+        (vvtd, DMAR_GSTS_REG, DMA_GSTS_QIES_SHIFT);
+
+}
+
 static void write_gcmd_sirtp(struct vvtd *vvtd, uint32_t val)
 {
     uint64_t irta = vvtd_get_reg_quad(vvtd, DMAR_IRTA_REG);
@@ -598,6 +612,10 @@ static void vvtd_write_gcmd(struct vvtd *vvtd, uint32_t val)
         write_gcmd_sirtp(vvtd, val);
     if ( changed & DMA_GCMD_IRE )
         write_gcmd_ire(vvtd, val);
+    if ( changed & DMA_GCMD_QIE )
+        write_gcmd_qie(vvtd, val);
+    if ( changed & ~(DMA_GCMD_SIRTP | DMA_GCMD_IRE | DMA_GCMD_QIE) )
+        vvtd_info("Only SIRTP, IRE, QIE in GCMD are handled");
 }
 
 static int vvtd_in_range(struct vcpu *v, unsigned long addr)
-- 
1.8.3.1


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