drm/v3d: Flush the MMU before we supply more memory to the binner

[ Upstream commit d2fb881110 ]

We must ensure that the MMU is flushed before we supply more memory to
the binner, otherwise we might end up with invalid MMU accesses by the
GPU.

Fixes: 57692c94dc ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240923141348.2422499-3-mcanal@igalia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/gpu/drm/v3d/v3d_drv.h

@@ -553,6 +553,7 @@ void v3d_irq_disable(struct v3d_dev *v3d);
 void v3d_irq_reset(struct v3d_dev *v3d);
 
 /* v3d_mmu.c */
+int v3d_mmu_flush_all(struct v3d_dev *v3d);
 int v3d_mmu_set_page_table(struct v3d_dev *v3d);
 void v3d_mmu_insert_ptes(struct v3d_bo *bo);
 void v3d_mmu_remove_ptes(struct v3d_bo *bo);

drivers/gpu/drm/v3d/v3d_irq.c

@@ -70,6 +70,8 @@ v3d_overflow_mem_work(struct work_struct *work)
 	list_add_tail(&bo->unref_head, &v3d->bin_job->render->unref_list);
 	spin_unlock_irqrestore(&v3d->job_lock, irqflags);
 
+	v3d_mmu_flush_all(v3d);
+
 	V3D_CORE_WRITE(0, V3D_PTB_BPOA, bo->node.start << V3D_MMU_PAGE_SHIFT);
 	V3D_CORE_WRITE(0, V3D_PTB_BPOS, obj->size);
 

drivers/gpu/drm/v3d/v3d_mmu.c

@@ -28,7 +28,7 @@
 #define V3D_PTE_WRITEABLE BIT(29)
 #define V3D_PTE_VALID BIT(28)
 
-static int v3d_mmu_flush_all(struct v3d_dev *v3d)
+int v3d_mmu_flush_all(struct v3d_dev *v3d)
 {
 	int ret;