drm/etnaviv: get cmdbuf physical address through the cmdbuf abstraction

Don't allow IOMMUv2 to peek directly into the cmdbuf, but get the
needed PA through a dedicated function.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>

drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.c

@@ -57,3 +57,8 @@ u32 etnaviv_cmdbuf_get_va(struct etnaviv_cmdbuf *buf)
 {
 	return etnaviv_iommu_get_cmdbuf_va(buf->gpu, buf);
 }
+
+dma_addr_t etnaviv_cmdbuf_get_pa(struct etnaviv_cmdbuf *buf)
+{
+	return buf->paddr;
+}

drivers/gpu/drm/etnaviv/etnaviv_cmdbuf.h

@@ -44,5 +44,6 @@ struct etnaviv_cmdbuf {
 };
 
 u32 etnaviv_cmdbuf_get_va(struct etnaviv_cmdbuf *buf);
+dma_addr_t etnaviv_cmdbuf_get_pa(struct etnaviv_cmdbuf *buf);
 
 #endif /* __ETNAVIV_CMDBUF_H__ */

drivers/gpu/drm/etnaviv/etnaviv_drv.c

@@ -176,7 +176,8 @@ static void etnaviv_buffer_dump(struct etnaviv_gpu *gpu, struct seq_file *m)
 	u32 i;
 
 	seq_printf(m, "virt %p - phys 0x%llx - free 0x%08x\n",
-			buf->vaddr, (u64)buf->paddr, size - buf->user_size);
+			buf->vaddr, (u64)etnaviv_cmdbuf_get_pa(buf),
+			size - buf->user_size);
 
 	for (i = 0; i < size / 4; i++) {
 		if (i && !(i % 4))

drivers/gpu/drm/etnaviv/etnaviv_iommu_v2.c

@@ -255,7 +255,8 @@ void etnaviv_iommuv2_restore(struct etnaviv_gpu *gpu)
 	prefetch = etnaviv_buffer_config_mmuv2(gpu,
 				(u32)etnaviv_domain->mtlb_dma,
 				(u32)etnaviv_domain->bad_page_dma);
-	etnaviv_gpu_start_fe(gpu, gpu->buffer->paddr, prefetch);
+	etnaviv_gpu_start_fe(gpu, (u32)etnaviv_cmdbuf_get_pa(gpu->buffer),
+			     prefetch);
 	etnaviv_gpu_wait_idle(gpu, 100);
 
 	gpu_write(gpu, VIVS_MMUv2_CONTROL, VIVS_MMUv2_CONTROL_ENABLE);