Merge tag 'gvt-fixes-2017-06-29' of https://github.com/01org/gvt-linux into drm-intel-next-fixes

gvt-fixes-2017-06-29

- two race fixes for VFIO locks from Chuanxiao
- virtual display fix for BDW from Xiong

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170629065424.kxopjbvntuakbyz2@zhen-hp.sh.intel.com

drivers/gpu/drm/i915/gvt/display.c

@@ -197,6 +197,12 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 			(TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST |
 			(PORT_B << TRANS_DDI_PORT_SHIFT) |
 			TRANS_DDI_FUNC_ENABLE);
+		if (IS_BROADWELL(dev_priv)) {
+			vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_B)) &=
+				~PORT_CLK_SEL_MASK;
+			vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_B)) |=
+				PORT_CLK_SEL_LCPLL_810;
+		}
 		vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_B)) |= DDI_BUF_CTL_ENABLE;
 		vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_B)) &= ~DDI_BUF_IS_IDLE;
 		vgpu_vreg(vgpu, SDEISR) |= SDE_PORTB_HOTPLUG_CPT;
@@ -211,6 +217,12 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 			(TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST |
 			(PORT_C << TRANS_DDI_PORT_SHIFT) |
 			TRANS_DDI_FUNC_ENABLE);
+		if (IS_BROADWELL(dev_priv)) {
+			vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_C)) &=
+				~PORT_CLK_SEL_MASK;
+			vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_C)) |=
+				PORT_CLK_SEL_LCPLL_810;
+		}
 		vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_C)) |= DDI_BUF_CTL_ENABLE;
 		vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_C)) &= ~DDI_BUF_IS_IDLE;
 		vgpu_vreg(vgpu, SFUSE_STRAP) |= SFUSE_STRAP_DDIC_DETECTED;
@@ -225,6 +237,12 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 			(TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST |
 			(PORT_D << TRANS_DDI_PORT_SHIFT) |
 			TRANS_DDI_FUNC_ENABLE);
+		if (IS_BROADWELL(dev_priv)) {
+			vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_D)) &=
+				~PORT_CLK_SEL_MASK;
+			vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_D)) |=
+				PORT_CLK_SEL_LCPLL_810;
+		}
 		vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_D)) |= DDI_BUF_CTL_ENABLE;
 		vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_D)) &= ~DDI_BUF_IS_IDLE;
 		vgpu_vreg(vgpu, SFUSE_STRAP) |= SFUSE_STRAP_DDID_DETECTED;
@@ -244,6 +262,10 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu)
 
 		vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_A)) |= DDI_INIT_DISPLAY_DETECTED;
 	}
+
+	/* Clear host CRT status, so guest couldn't detect this host CRT. */
+	if (IS_BROADWELL(dev_priv))
+		vgpu_vreg(vgpu, PCH_ADPA) &= ~ADPA_CRT_HOTPLUG_MONITOR_MASK;
 }
 
 static void clean_virtual_dp_monitor(struct intel_vgpu *vgpu, int port_num)

drivers/gpu/drm/i915/gvt/gvt.h

@@ -182,6 +182,9 @@ struct intel_vgpu {
 		struct kvm *kvm;
 		struct work_struct release_work;
 		atomic_t released;
+		struct work_struct unpin_work;
+		spinlock_t unpin_lock; /* To protect unpin_list */
+		struct list_head unpin_list;
 	} vdev;
 #endif
 };

drivers/gpu/drm/i915/gvt/handlers.c

@@ -367,21 +367,24 @@ static int lcpll_ctl_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
 static int dpy_reg_mmio_read(struct intel_vgpu *vgpu, unsigned int offset,
 		void *p_data, unsigned int bytes)
 {
-	*(u32 *)p_data = (1 << 17);
-	return 0;
-}
-
-static int dpy_reg_mmio_read_2(struct intel_vgpu *vgpu, unsigned int offset,
-		void *p_data, unsigned int bytes)
-{
-	*(u32 *)p_data = 3;
-	return 0;
-}
+	switch (offset) {
+	case 0xe651c:
+	case 0xe661c:
+	case 0xe671c:
+	case 0xe681c:
+		vgpu_vreg(vgpu, offset) = 1 << 17;
+		break;
+	case 0xe6c04:
+		vgpu_vreg(vgpu, offset) = 0x3;
+		break;
+	case 0xe6e1c:
+		vgpu_vreg(vgpu, offset) = 0x2f << 16;
+		break;
+	default:
+		return -EINVAL;
+	}
 
-static int dpy_reg_mmio_read_3(struct intel_vgpu *vgpu, unsigned int offset,
-		void *p_data, unsigned int bytes)
-{
-	*(u32 *)p_data = (0x2f << 16);
+	read_vreg(vgpu, offset, p_data, bytes);
 	return 0;
 }
 
@@ -1925,7 +1928,7 @@ static int init_generic_mmio_info(struct intel_gvt *gvt)
 	MMIO_F(_PCH_DPD_AUX_CH_CTL, 6 * 4, 0, 0, 0, D_PRE_SKL, NULL,
 		dp_aux_ch_ctl_mmio_write);
 
-	MMIO_RO(PCH_ADPA, D_ALL, 0, ADPA_CRT_HOTPLUG_MONITOR_MASK, NULL, pch_adpa_mmio_write);
+	MMIO_DH(PCH_ADPA, D_PRE_SKL, NULL, pch_adpa_mmio_write);
 
 	MMIO_DH(_PCH_TRANSACONF, D_ALL, NULL, transconf_mmio_write);
 	MMIO_DH(_PCH_TRANSBCONF, D_ALL, NULL, transconf_mmio_write);
@@ -2011,8 +2014,8 @@ static int init_generic_mmio_info(struct intel_gvt *gvt)
 	MMIO_DH(0xe661c, D_ALL, dpy_reg_mmio_read, NULL);
 	MMIO_DH(0xe671c, D_ALL, dpy_reg_mmio_read, NULL);
 	MMIO_DH(0xe681c, D_ALL, dpy_reg_mmio_read, NULL);
-	MMIO_DH(0xe6c04, D_ALL, dpy_reg_mmio_read_2, NULL);
-	MMIO_DH(0xe6e1c, D_ALL, dpy_reg_mmio_read_3, NULL);
+	MMIO_DH(0xe6c04, D_ALL, dpy_reg_mmio_read, NULL);
+	MMIO_DH(0xe6e1c, D_ALL, dpy_reg_mmio_read, NULL);
 
 	MMIO_RO(PCH_PORT_HOTPLUG, D_ALL, 0,
 		PORTA_HOTPLUG_STATUS_MASK

drivers/gpu/drm/i915/gvt/kvmgt.c

@@ -78,6 +78,7 @@ struct gvt_dma {
 	struct rb_node node;
 	gfn_t gfn;
 	unsigned long iova;
+	struct list_head list;
 };
 
 static inline bool handle_valid(unsigned long handle)
@@ -166,6 +167,7 @@ static void gvt_cache_add(struct intel_vgpu *vgpu, gfn_t gfn,
 
 	new->gfn = gfn;
 	new->iova = iova;
+	INIT_LIST_HEAD(&new->list);
 
 	mutex_lock(&vgpu->vdev.cache_lock);
 	while (*link) {
@@ -197,26 +199,52 @@ static void __gvt_cache_remove_entry(struct intel_vgpu *vgpu,
 	kfree(entry);
 }
 
-static void gvt_cache_remove(struct intel_vgpu *vgpu, gfn_t gfn)
+static void intel_vgpu_unpin_work(struct work_struct *work)
 {
+	struct intel_vgpu *vgpu = container_of(work, struct intel_vgpu,
+					       vdev.unpin_work);
 	struct device *dev = mdev_dev(vgpu->vdev.mdev);
 	struct gvt_dma *this;
-	unsigned long g1;
-	int rc;
+	unsigned long gfn;
+
+	for (;;) {
+		spin_lock(&vgpu->vdev.unpin_lock);
+		if (list_empty(&vgpu->vdev.unpin_list)) {
+			spin_unlock(&vgpu->vdev.unpin_lock);
+			break;
+		}
+		this = list_first_entry(&vgpu->vdev.unpin_list,
+					struct gvt_dma, list);
+		list_del(&this->list);
+		spin_unlock(&vgpu->vdev.unpin_lock);
+
+		gfn = this->gfn;
+		vfio_unpin_pages(dev, &gfn, 1);
+		kfree(this);
+	}
+}
+
+static bool gvt_cache_mark_remove(struct intel_vgpu *vgpu, gfn_t gfn)
+{
+	struct gvt_dma *this;
 
 	mutex_lock(&vgpu->vdev.cache_lock);
 	this  = __gvt_cache_find(vgpu, gfn);
 	if (!this) {
 		mutex_unlock(&vgpu->vdev.cache_lock);
-		return;
+		return false;
 	}
-
-	g1 = gfn;
 	gvt_dma_unmap_iova(vgpu, this->iova);
-	rc = vfio_unpin_pages(dev, &g1, 1);
-	WARN_ON(rc != 1);
-	__gvt_cache_remove_entry(vgpu, this);
+	/* remove this from rb tree */
+	rb_erase(&this->node, &vgpu->vdev.cache);
 	mutex_unlock(&vgpu->vdev.cache_lock);
+
+	/* put this to the unpin_list */
+	spin_lock(&vgpu->vdev.unpin_lock);
+	list_move_tail(&this->list, &vgpu->vdev.unpin_list);
+	spin_unlock(&vgpu->vdev.unpin_lock);
+
+	return true;
 }
 
 static void gvt_cache_init(struct intel_vgpu *vgpu)
@@ -232,16 +260,20 @@ static void gvt_cache_destroy(struct intel_vgpu *vgpu)
 	struct device *dev = mdev_dev(vgpu->vdev.mdev);
 	unsigned long gfn;
 
-	mutex_lock(&vgpu->vdev.cache_lock);
-	while ((node = rb_first(&vgpu->vdev.cache))) {
+	for (;;) {
+		mutex_lock(&vgpu->vdev.cache_lock);
+		node = rb_first(&vgpu->vdev.cache);
+		if (!node) {
+			mutex_unlock(&vgpu->vdev.cache_lock);
+			break;
+		}
 		dma = rb_entry(node, struct gvt_dma, node);
 		gvt_dma_unmap_iova(vgpu, dma->iova);
 		gfn = dma->gfn;
-
-		vfio_unpin_pages(dev, &gfn, 1);
 		__gvt_cache_remove_entry(vgpu, dma);
+		mutex_unlock(&vgpu->vdev.cache_lock);
+		vfio_unpin_pages(dev, &gfn, 1);
 	}
-	mutex_unlock(&vgpu->vdev.cache_lock);
 }
 
 static struct intel_vgpu_type *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
@@ -453,6 +485,9 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
 	}
 
 	INIT_WORK(&vgpu->vdev.release_work, intel_vgpu_release_work);
+	INIT_WORK(&vgpu->vdev.unpin_work, intel_vgpu_unpin_work);
+	spin_lock_init(&vgpu->vdev.unpin_lock);
+	INIT_LIST_HEAD(&vgpu->vdev.unpin_list);
 
 	vgpu->vdev.mdev = mdev;
 	mdev_set_drvdata(mdev, vgpu);
@@ -482,6 +517,7 @@ static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
 	struct intel_vgpu *vgpu = container_of(nb,
 					struct intel_vgpu,
 					vdev.iommu_notifier);
+	bool sched_unmap = false;
 
 	if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
 		struct vfio_iommu_type1_dma_unmap *unmap = data;
@@ -491,7 +527,10 @@ static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
 		end_gfn = gfn + unmap->size / PAGE_SIZE;
 
 		while (gfn < end_gfn)
-			gvt_cache_remove(vgpu, gfn++);
+			sched_unmap |= gvt_cache_mark_remove(vgpu, gfn++);
+
+		if (sched_unmap)
+			schedule_work(&vgpu->vdev.unpin_work);
 	}
 
 	return NOTIFY_OK;