diff options
Diffstat (limited to 'drivers/uio')
| -rw-r--r-- | drivers/uio/uio.c | 47 | ||||
| -rw-r--r-- | drivers/uio/uio_dmem_genirq.c | 22 | ||||
| -rw-r--r-- | drivers/uio/uio_pruss.c | 6 |
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; |