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>

5 files changed, 39 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index cdcf5eaf6714..bed84b316bba 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 53a2c27dd8fa..0372ec96020f 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 6a8617bac142..06def708b014 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 a61de1f9ff64..da35bd7f38dc 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 af98f45954b3..3aa3a65800ab 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;
 }