[2/6] drm/rockchip: vop: fix iommu page fault when resume
diff mbox

Message ID 1501494582-6934-1-git-send-email-mark.yao@rock-chips.com
State New
Headers show

Commit Message

yao mark July 31, 2017, 9:49 a.m. UTC
Iommu would get page fault with following path:
   vop_disable:
      1, disable all windows and set vop config done
      2, vop enter to standy, all windows not works, but their registers
         are not clean, when you read window's enable bit, may found the
         window is enable.

   vop_enable:
      1, memcpy(vop->regsbak, vop->regs, len)
         save current vop registers to vop->regsbak, then you can found
         window is enable on regsbak.
      2, VOP_WIN_SET(vop, win, gate, 1);
         force enable window gate, but gate and enable are on same
         hardware register, then window enable bit rewrite to vop hardware.
      3, vop power on, and vop might try to scan destroyed buffer,
         then iommu get page fault.

Move windows disable after vop regsbak restore, then vop regsbak mechanism
would keep tracing the modify, everything would be safe.

Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 33 +++++++++++++----------------
 1 file changed, 15 insertions(+), 18 deletions(-)

Comments

Sandy Huang Aug. 3, 2017, 1:06 p.m. UTC | #1
Hi mark,

在 2017/7/31 17:49, Mark Yao 写道:
> Iommu would get page fault with following path:
>     vop_disable:
>        1, disable all windows and set vop config done
>        2, vop enter to standy, all windows not works, but their registers
>           are not clean, when you read window's enable bit, may found the
>           window is enable.
> 
>     vop_enable:
>        1, memcpy(vop->regsbak, vop->regs, len)
>           save current vop registers to vop->regsbak, then you can found
>           window is enable on regsbak.
>        2, VOP_WIN_SET(vop, win, gate, 1);
>           force enable window gate, but gate and enable are on same
>           hardware register, then window enable bit rewrite to vop hardware.
>        3, vop power on, and vop might try to scan destroyed buffer,
>           then iommu get page fault.
> 
> Move windows disable after vop regsbak restore, then vop regsbak mechanism
> would keep tracing the modify, everything would be safe.
> 
> Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
> ---
>   drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 33 +++++++++++++----------------
>   1 file changed, 15 insertions(+), 18 deletions(-)
> 

Reviewed-by: Sandy huang <sandy.huang@rock-chips.com>

Patch
diff mbox

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 0bfd563..0b5fd75 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -495,7 +495,7 @@  static void vop_line_flag_irq_disable(struct vop *vop)
 static int vop_enable(struct drm_crtc *crtc)
 {
 	struct vop *vop = to_vop(crtc);
-	int ret;
+	int ret, i;
 
 	ret = pm_runtime_get_sync(vop->dev);
 	if (ret < 0) {
@@ -528,6 +528,20 @@  static int vop_enable(struct drm_crtc *crtc)
 	}
 
 	memcpy(vop->regs, vop->regsbak, vop->len);
+	/*
+	 * We need to make sure that all windows are disabled before we
+	 * enable the crtc. Otherwise we might try to scan from a destroyed
+	 * buffer later.
+	 */
+	for (i = 0; i < vop->data->win_size; i++) {
+		struct vop_win *vop_win = &vop->win[i];
+		const struct vop_win_data *win = vop_win->data;
+
+		spin_lock(&vop->reg_lock);
+		VOP_WIN_SET(vop, win, enable, 0);
+		spin_unlock(&vop->reg_lock);
+	}
+
 	vop_cfg_done(vop);
 
 	/*
@@ -561,28 +575,11 @@  static int vop_enable(struct drm_crtc *crtc)
 static void vop_crtc_disable(struct drm_crtc *crtc)
 {
 	struct vop *vop = to_vop(crtc);
-	int i;
 
 	WARN_ON(vop->event);
 
 	rockchip_drm_psr_deactivate(&vop->crtc);
 
-	/*
-	 * We need to make sure that all windows are disabled before we
-	 * disable that crtc. Otherwise we might try to scan from a destroyed
-	 * buffer later.
-	 */
-	for (i = 0; i < vop->data->win_size; i++) {
-		struct vop_win *vop_win = &vop->win[i];
-		const struct vop_win_data *win = vop_win->data;
-
-		spin_lock(&vop->reg_lock);
-		VOP_WIN_SET(vop, win, enable, 0);
-		spin_unlock(&vop->reg_lock);
-	}
-
-	vop_cfg_done(vop);
-
 	drm_crtc_vblank_off(crtc);
 
 	/*