Merging upstream version 6.9.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

3 files changed, 59 insertions, 16 deletions

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 2d572f6c8e..009158fef2 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -24,6 +24,7 @@
 #include <linux/kobject.h>
 #include <linux/cdev.h>
 #include <linux/uio_driver.h>
+#include <linux/dma-mapping.h>
 
 #define UIO_MAX_DEVICES		(1U << MINORBITS)
 
@@ -759,6 +760,49 @@ static int uio_mmap_physical(struct vm_area_struct *vma)
 			       vma->vm_page_prot);
 }
 
+static int uio_mmap_dma_coherent(struct vm_area_struct *vma)
+{
+	struct uio_device *idev = vma->vm_private_data;
+	struct uio_mem *mem;
+	void *addr;
+	int ret = 0;
+	int mi;
+
+	mi = uio_find_mem_index(vma);
+	if (mi < 0)
+		return -EINVAL;
+
+	mem = idev->info->mem + mi;
+
+	if (mem->addr & ~PAGE_MASK)
+		return -ENODEV;
+	if (mem->dma_addr & ~PAGE_MASK)
+		return -ENODEV;
+	if (!mem->dma_device)
+		return -ENODEV;
+	if (vma->vm_end - vma->vm_start > mem->size)
+		return -EINVAL;
+
+	dev_warn(mem->dma_device,
+		 "use of UIO_MEM_DMA_COHERENT is highly discouraged");
+
+	/*
+	 * UIO uses offset to index into the maps for a device.
+	 * We need to clear vm_pgoff for dma_mmap_coherent.
+	 */
+	vma->vm_pgoff = 0;
+
+	addr = (void *)(uintptr_t)mem->addr;
+	ret = dma_mmap_coherent(mem->dma_device,
+				vma,
+				addr,
+				mem->dma_addr,
+				vma->vm_end - vma->vm_start);
+	vma->vm_pgoff = mi;
+
+	return ret;
+}
+
 static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 {
 	struct uio_listener *listener = filep->private_data;
@@ -806,6 +850,9 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 	case UIO_MEM_VIRTUAL:
 		ret = uio_mmap_logical(vma);
 		break;
+	case UIO_MEM_DMA_COHERENT:
+		ret = uio_mmap_dma_coherent(vma);
+		break;
 	default:
 		ret = -EINVAL;
 	}
diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c
index 5313307c27..13cc35ab5d 100644
--- a/drivers/uio/uio_dmem_genirq.c
+++ b/drivers/uio/uio_dmem_genirq.c
@@ -36,7 +36,6 @@ struct uio_dmem_genirq_platdata {
 	struct platform_device *pdev;
 	unsigned int dmem_region_start;
 	unsigned int num_dmem_regions;
-	void *dmem_region_vaddr[MAX_UIO_MAPS];
 	struct mutex alloc_lock;
 	unsigned int refcnt;
 };
@@ -50,7 +49,6 @@ static int uio_dmem_genirq_open(struct uio_info *info, struct inode *inode)
 {
 	struct uio_dmem_genirq_platdata *priv = info->priv;
 	struct uio_mem *uiomem;
-	int dmem_region = priv->dmem_region_start;
 
 	uiomem = &priv->uioinfo->mem[priv->dmem_region_start];
 
@@ -61,11 +59,8 @@ static int uio_dmem_genirq_open(struct uio_info *info, struct inode *inode)
 			break;
 
 		addr = dma_alloc_coherent(&priv->pdev->dev, uiomem->size,
-				(dma_addr_t *)&uiomem->addr, GFP_KERNEL);
-		if (!addr) {
-			uiomem->addr = DMEM_MAP_ERROR;
-		}
-		priv->dmem_region_vaddr[dmem_region++] = addr;
+					  &uiomem->dma_addr, GFP_KERNEL);
+		uiomem->addr = addr ? (uintptr_t) addr : DMEM_MAP_ERROR;
 		++uiomem;
 	}
 	priv->refcnt++;
@@ -80,7 +75,6 @@ static int uio_dmem_genirq_release(struct uio_info *info, struct inode *inode)
 {
 	struct uio_dmem_genirq_platdata *priv = info->priv;
 	struct uio_mem *uiomem;
-	int dmem_region = priv->dmem_region_start;
 
 	/* Tell the Runtime PM code that the device has become idle */
 	pm_runtime_put_sync(&priv->pdev->dev);
@@ -93,13 +87,12 @@ static int uio_dmem_genirq_release(struct uio_info *info, struct inode *inode)
 	while (!priv->refcnt && uiomem < &priv->uioinfo->mem[MAX_UIO_MAPS]) {
 		if (!uiomem->size)
 			break;
-		if (priv->dmem_region_vaddr[dmem_region]) {
-			dma_free_coherent(&priv->pdev->dev, uiomem->size,
-					priv->dmem_region_vaddr[dmem_region],
-					uiomem->addr);
+		if (uiomem->addr) {
+			dma_free_coherent(uiomem->dma_device, uiomem->size,
+					  (void *) (uintptr_t) uiomem->addr,
+					  uiomem->dma_addr);
 		}
 		uiomem->addr = DMEM_MAP_ERROR;
-		++dmem_region;
 		++uiomem;
 	}
 
@@ -264,7 +257,8 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
 					" dynamic and fixed memory regions.\n");
 			break;
 		}
-		uiomem->memtype = UIO_MEM_PHYS;
+		uiomem->memtype = UIO_MEM_DMA_COHERENT;
+		uiomem->dma_device = &pdev->dev;
 		uiomem->addr = DMEM_MAP_ERROR;
 		uiomem->size = pdata->dynamic_region_sizes[i];
 		++uiomem;
diff --git a/drivers/uio/uio_pruss.c b/drivers/uio/uio_pruss.c
index 77e2dc4048..f67881cba6 100644
--- a/drivers/uio/uio_pruss.c
+++ b/drivers/uio/uio_pruss.c
@@ -191,9 +191,11 @@ static int pruss_probe(struct platform_device *pdev)
 		p->mem[1].size = sram_pool_sz;
 		p->mem[1].memtype = UIO_MEM_PHYS;
 
-		p->mem[2].addr = gdev->ddr_paddr;
+		p->mem[2].addr = (uintptr_t) gdev->ddr_vaddr;
+		p->mem[2].dma_addr = gdev->ddr_paddr;
 		p->mem[2].size = extram_pool_sz;
-		p->mem[2].memtype = UIO_MEM_PHYS;
+		p->mem[2].memtype = UIO_MEM_DMA_COHERENT;
+		p->mem[2].dma_device = dev;
 
 		p->name = devm_kasprintf(dev, GFP_KERNEL, "pruss_evt%d", cnt);
 		p->version = DRV_VERSION;