Merge branch 'etnaviv/next' of https://git.pengutronix.de/git/lst/linux into drm-next

- make etnaviv work on IOMMU enabled systems
- fix mapping of command buffers on systems with more than 4GB RAM
- close a DoS vector
- fix spurious GPU resets

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Lucas Stach <l.stach@pengutronix.de>
Link: https://patchwork.freedesktop.org/patch/msgid/59619f8e9eb1d7ed7ea72cbead1f0aabc49f4e68.camel@pengutronix.de

drivers/gpu/drm/etnaviv/etnaviv_drv.c

@@ -589,6 +589,7 @@ static int compare_str(struct device *dev, void *data)
 static int etnaviv_pdev_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
+	struct device_node *first_node = NULL;
 	struct component_match *match = NULL;
 
 	if (!dev->platform_data) {
@@ -598,6 +599,9 @@ static int etnaviv_pdev_probe(struct platform_device *pdev)
 			if (!of_device_is_available(core_node))
 				continue;
 
+			if (!first_node)
+				first_node = core_node;
+
 			drm_of_component_match_add(&pdev->dev, &match,
 						   compare_of, core_node);
 		}
@@ -609,6 +613,32 @@ static int etnaviv_pdev_probe(struct platform_device *pdev)
 			component_match_add(dev, &match, compare_str, names[i]);
 	}
 
+	/*
+	 * PTA and MTLB can have 40 bit base addresses, but
+	 * unfortunately, an entry in the MTLB can only point to a
+	 * 32 bit base address of a STLB. Moreover, to initialize the
+	 * MMU we need a command buffer with a 32 bit address because
+	 * without an MMU there is only an indentity mapping between
+	 * the internal 32 bit addresses and the bus addresses.
+	 *
+	 * To make things easy, we set the dma_coherent_mask to 32
+	 * bit to make sure we are allocating the command buffers and
+	 * TLBs in the lower 4 GiB address space.
+	 */
+	if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(40)) ||
+	    dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32))) {
+		dev_dbg(&pdev->dev, "No suitable DMA available\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Apply the same DMA configuration to the virtual etnaviv
+	 * device as the GPU we found. This assumes that all Vivante
+	 * GPUs in the system share the same DMA constraints.
+	 */
+	if (first_node)
+		of_dma_configure(&pdev->dev, first_node, true);
+
 	return component_master_add_with_match(dev, &etnaviv_master_ops, match);
 }
 
@@ -653,21 +683,12 @@ static int __init etnaviv_init(void)
 		if (!of_device_is_available(np))
 			continue;
 
-		pdev = platform_device_alloc("etnaviv", -1);
+		pdev = platform_device_alloc("etnaviv", PLATFORM_DEVID_NONE);
 		if (!pdev) {
 			ret = -ENOMEM;
 			of_node_put(np);
 			goto unregister_platform_driver;
 		}
-		pdev->dev.coherent_dma_mask = DMA_BIT_MASK(40);
-		pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
-
-		/*
-		 * Apply the same DMA configuration to the virtual etnaviv
-		 * device as the GPU we found. This assumes that all Vivante
-		 * GPUs in the system share the same DMA constraints.
-		 */
-		of_dma_configure(&pdev->dev, np, true);
 
 		ret = platform_device_add(pdev);
 		if (ret) {

drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c

@@ -469,6 +469,12 @@ int etnaviv_ioctl_gem_submit(struct drm_device *dev, void *data,
 		return -EINVAL;
 	}
 
+	if (args->stream_size > SZ_64K || args->nr_relocs > SZ_64K ||
+	    args->nr_bos > SZ_64K || args->nr_pmrs > 128) {
+		DRM_ERROR("submit arguments out of size limits\n");
+		return -EINVAL;
+	}
+
 	/*
 	 * Copy the command submission and bo array to kernel space in
 	 * one go, and do this outside of any locks.

drivers/gpu/drm/etnaviv/etnaviv_gpu.c

@@ -1658,7 +1658,7 @@ etnaviv_gpu_cooling_set_cur_state(struct thermal_cooling_device *cdev,
 	return 0;
 }
 
-static struct thermal_cooling_device_ops cooling_ops = {
+static const struct thermal_cooling_device_ops cooling_ops = {
 	.get_max_state = etnaviv_gpu_cooling_get_max_state,
 	.get_cur_state = etnaviv_gpu_cooling_get_cur_state,
 	.set_cur_state = etnaviv_gpu_cooling_set_cur_state,

drivers/gpu/drm/etnaviv/etnaviv_gpu.h

@@ -130,6 +130,7 @@ struct etnaviv_gpu {
 
 	/* hang detection */
 	u32 hangcheck_dma_addr;
+	u32 hangcheck_fence;
 
 	void __iomem *mmio;
 	int irq;

drivers/gpu/drm/etnaviv/etnaviv_sched.c

@@ -107,8 +107,10 @@ static enum drm_gpu_sched_stat etnaviv_sched_timedout_job(struct drm_sched_job
 	 */
 	dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
 	change = dma_addr - gpu->hangcheck_dma_addr;
-	if (change < 0 || change > 16) {
+	if (gpu->completed_fence != gpu->hangcheck_fence ||
+	    change < 0 || change > 16) {
 		gpu->hangcheck_dma_addr = dma_addr;
+		gpu->hangcheck_fence = gpu->completed_fence;
 		goto out_no_timeout;
 	}