From: Matthew Garrett <mjg@redhat.com>
Date: Mon, 26 Apr 2010 19:52:20 +0000 (-0400)
Subject: radeon: Unmap vram pages when reclocking
X-Git-Tag: upstream/snapshot3+hdmi~14080^2~60
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=5876dd249e8e47c730cac090bf6edd88e5f04327;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

radeon: Unmap vram pages when reclocking

Touching vram while the card is reclocking can lead to lockups. Unmap
any pages that could be touched by the CPU and block any accesses to
vram until the reclocking is complete.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
---

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index cdcf5ea..bed84b3 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -1024,6 +1024,7 @@ struct radeon_device {
 	struct work_struct hotplug_work;
 	int num_crtc; /* number of crtcs */
 	struct mutex dc_hw_i2c_mutex; /* display controller hw i2c mutex */
+	struct mutex vram_mutex;
 
 	/* audio stuff */
 	struct timer_list	audio_timer;
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 53a2c27..0372ec9 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -599,6 +599,7 @@ int radeon_device_init(struct radeon_device *rdev,
 		spin_lock_init(&rdev->ih.lock);
 	mutex_init(&rdev->gem.mutex);
 	mutex_init(&rdev->pm.mutex);
+	mutex_init(&rdev->vram_mutex);
 	rwlock_init(&rdev->fence_drv.lock);
 	INIT_LIST_HEAD(&rdev->gem.objects);
 	init_waitqueue_head(&rdev->irq.vblank_queue);
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 6a8617b..06def70 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -112,9 +112,11 @@ int radeon_bo_create(struct radeon_device *rdev, struct drm_gem_object *gobj,
 
 	radeon_ttm_placement_from_domain(bo, domain);
 	/* Kernel allocation are uninterruptible */
+	mutex_lock(&rdev->vram_mutex);
 	r = ttm_bo_init(&rdev->mman.bdev, &bo->tbo, size, type,
 			&bo->placement, 0, 0, !kernel, NULL, size,
 			&radeon_ttm_bo_destroy);
+	mutex_unlock(&rdev->vram_mutex);
 	if (unlikely(r != 0)) {
 		if (r != -ERESTARTSYS)
 			dev_err(rdev->dev,
@@ -170,7 +172,9 @@ void radeon_bo_unref(struct radeon_bo **bo)
 	if ((*bo) == NULL)
 		return;
 	tbo = &((*bo)->tbo);
+	mutex_lock(&(*bo)->rdev->vram_mutex);
 	ttm_bo_unref(&tbo);
+	mutex_unlock(&(*bo)->rdev->vram_mutex);
 	if (tbo == NULL)
 		*bo = NULL;
 }
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index a61de1f..da35bd7 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -32,6 +32,28 @@
 static void radeon_pm_idle_work_handler(struct work_struct *work);
 static int radeon_debugfs_pm_init(struct radeon_device *rdev);
 
+static void radeon_unmap_vram_bos(struct radeon_device *rdev)
+{
+	struct radeon_bo *bo, *n;
+
+	if (list_empty(&rdev->gem.objects))
+		return;
+
+	list_for_each_entry_safe(bo, n, &rdev->gem.objects, list) {
+		if (bo->tbo.mem.mem_type == TTM_PL_VRAM)
+			ttm_bo_unmap_virtual(&bo->tbo);
+	}
+
+	if (rdev->gart.table.vram.robj)
+		ttm_bo_unmap_virtual(&rdev->gart.table.vram.robj->tbo);
+
+	if (rdev->stollen_vga_memory)
+		ttm_bo_unmap_virtual(&rdev->stollen_vga_memory->tbo);
+
+	if (rdev->r600_blit.shader_obj)
+		ttm_bo_unmap_virtual(&rdev->r600_blit.shader_obj->tbo);
+}
+
 static void radeon_pm_set_clocks(struct radeon_device *rdev, int static_switch)
 {
 	int i;
@@ -48,6 +70,10 @@ static void radeon_pm_set_clocks(struct radeon_device *rdev, int static_switch)
 	rdev->irq.gui_idle = false;
 	radeon_irq_set(rdev);
 
+	mutex_lock(&rdev->vram_mutex);
+
+	radeon_unmap_vram_bos(rdev);
+
 	if (!static_switch) {
 		for (i = 0; i < rdev->num_crtc; i++) {
 			if (rdev->pm.active_crtcs & (1 << i)) {
@@ -67,6 +93,8 @@ static void radeon_pm_set_clocks(struct radeon_device *rdev, int static_switch)
 			}
 		}
 	}
+
+	mutex_unlock(&rdev->vram_mutex);
 	
 	/* update display watermarks based on new power state */
 	radeon_update_bandwidth_info(rdev);
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index af98f45..3aa3a65 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -607,13 +607,17 @@ static const struct vm_operations_struct *ttm_vm_ops = NULL;
 static int radeon_ttm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct ttm_buffer_object *bo;
+	struct radeon_device *rdev;
 	int r;
 
-	bo = (struct ttm_buffer_object *)vma->vm_private_data;
+	bo = (struct ttm_buffer_object *)vma->vm_private_data;	
 	if (bo == NULL) {
 		return VM_FAULT_NOPAGE;
 	}
+	rdev = radeon_get_rdev(bo->bdev);
+	mutex_lock(&rdev->vram_mutex);
 	r = ttm_vm_ops->fault(vma, vmf);
+	mutex_unlock(&rdev->vram_mutex);
 	return r;
 }