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s390/pci_dma: improve debugging of errors during dma map

Browse source 
Improve debugging to find out what went wrong during a failed
dma map/unmap operation.

Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Sebastian Ott 2015-10-26 11:20:44 +01:00 • committed by Martin Schwidefsky
parent 66728eeea6
commit 52d43d8184
1 changed files with 30 additions and 11 deletions
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41
arch/s390/pci/pci_dma.c
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@ -269,6 +269,16 @@ out:
spin_unlock_irqrestore(&zdev->iommu_bitmap_lock, flags);
}
static inline void zpci_err_dma(unsigned long rc, unsigned long addr)
{
struct {
unsigned long rc;
unsigned long addr;
} __packed data = {rc, addr};
zpci_err_hex(&data, sizeof(data));
}
static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction direction,
@ -279,33 +289,40 @@ static dma_addr_t s390_dma_map_pages(struct device *dev, struct page *page,
unsigned long pa = page_to_phys(page) + offset;
int flags = ZPCI_PTE_VALID;
dma_addr_t dma_addr;
int ret;
/* This rounds up number of pages based on size and offset */
nr_pages = iommu_num_pages(pa, size, PAGE_SIZE);
iommu_page_index = dma_alloc_iommu(zdev, nr_pages);
if (iommu_page_index == -1)
if (iommu_page_index == -1) {
ret = -ENOSPC;
goto out_err;
}
/* Use rounded up size */
size = nr_pages * PAGE_SIZE;
dma_addr = zdev->start_dma + iommu_page_index * PAGE_SIZE;
if (dma_addr + size > zdev->end_dma)
if (dma_addr + size > zdev->end_dma) {
ret = -ERANGE;
goto out_free;
}
if (direction == DMA_NONE || direction == DMA_TO_DEVICE)
flags |= ZPCI_TABLE_PROTECTED;
if (!dma_update_trans(zdev, pa, dma_addr, size, flags)) {
atomic64_add(nr_pages, &zdev->mapped_pages);
return dma_addr + (offset & ~PAGE_MASK);
}
ret = dma_update_trans(zdev, pa, dma_addr, size, flags);
if (ret)
goto out_free;
atomic64_add(nr_pages, &zdev->mapped_pages);
return dma_addr + (offset & ~PAGE_MASK);
out_free:
dma_free_iommu(zdev, iommu_page_index, nr_pages);
out_err:
zpci_err("map error:\n");
zpci_err_hex(&pa, sizeof(pa));
zpci_err_dma(ret, pa);
return DMA_ERROR_CODE;
}
@ -315,14 +332,16 @@ static void s390_dma_unmap_pages(struct device *dev, dma_addr_t dma_addr,
{
struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
unsigned long iommu_page_index;
int npages;
int npages, ret;
npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
dma_addr = dma_addr & PAGE_MASK;
if (dma_update_trans(zdev, 0, dma_addr, npages * PAGE_SIZE,
ZPCI_PTE_INVALID)) {
ret = dma_update_trans(zdev, 0, dma_addr, npages * PAGE_SIZE,
ZPCI_PTE_INVALID);
if (ret) {
zpci_err("unmap error:\n");
zpci_err_hex(&dma_addr, sizeof(dma_addr));
zpci_err_dma(ret, dma_addr);
return;
}
atomic64_add(npages, &zdev->unmapped_pages);