* Re: linux-next: Intel iommu: new warning
2008-04-22 4:42 linux-next: Intel iommu: new warning Stephen Rothwell
@ 2008-04-22 9:27 ` Ingo Molnar
0 siblings, 0 replies; 2+ messages in thread
From: Ingo Molnar @ 2008-04-22 9:27 UTC (permalink / raw)
To: Stephen Rothwell; +Cc: Thomas Gleixner, LKML, linux-next, Glauber Costa
* Stephen Rothwell <sfr@canb.auug.org.au> wrote:
> Hi Ingo,
>
> Commit 2be621498d461b63ca6124f86e3b9582e1a8e722 ("x86: dma-ops on
> highmem fix") in Linus' tree introduced a new warning (noticed in the
> x86_64 allmodconfig build of linux-next):
>
> drivers/pci/intel-iommu.c:2240: warning: initialization from
> incompatible pointer type
>
> Which I think points at an instance of map_single that needs updating.
good catch! The patch below should fix it.
Ingo
---------------------------------->
Subject: intel-iommu.c: dma ops fix
From: Ingo Molnar <mingo@elte.hu>
Date: Tue Apr 22 11:09:04 CEST 2008
Stephen Rothwell noticed that:
Commit 2be621498d461b63ca6124f86e3b9582e1a8e722 ("x86: dma-ops on highmem
fix") in Linus' tree introduced a new warning (noticed in the x86_64
allmodconfig build of linux-next):
drivers/pci/intel-iommu.c:2240: warning: initialization from incompatible pointer type
Which points at an instance of map_single that needs updating.
Fix it to the new prototype.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
drivers/pci/intel-iommu.c | 35 +++++++++++++++++------------------
1 file changed, 17 insertions(+), 18 deletions(-)
Index: linux-x86.q/drivers/pci/intel-iommu.c
===================================================================
--- linux-x86.q.orig/drivers/pci/intel-iommu.c
+++ linux-x86.q/drivers/pci/intel-iommu.c
@@ -1905,32 +1905,31 @@ get_valid_domain_for_dev(struct pci_dev
return domain;
}
-static dma_addr_t intel_map_single(struct device *hwdev, void *addr,
- size_t size, int dir)
+static dma_addr_t
+intel_map_single(struct device *hwdev, phys_addr_t paddr, size_t size, int dir)
{
struct pci_dev *pdev = to_pci_dev(hwdev);
- int ret;
struct dmar_domain *domain;
- unsigned long start_addr;
+ unsigned long start_paddr;
struct iova *iova;
int prot = 0;
+ int ret;
BUG_ON(dir == DMA_NONE);
if (pdev->dev.archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO)
- return virt_to_bus(addr);
+ return paddr;
domain = get_valid_domain_for_dev(pdev);
if (!domain)
return 0;
- addr = (void *)virt_to_phys(addr);
- size = aligned_size((u64)addr, size);
+ size = aligned_size((u64)paddr, size);
iova = __intel_alloc_iova(hwdev, domain, size);
if (!iova)
goto error;
- start_addr = iova->pfn_lo << PAGE_SHIFT_4K;
+ start_paddr = iova->pfn_lo << PAGE_SHIFT_4K;
/*
* Check if DMAR supports zero-length reads on write only
@@ -1942,33 +1941,33 @@ static dma_addr_t intel_map_single(struc
if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
prot |= DMA_PTE_WRITE;
/*
- * addr - (addr + size) might be partial page, we should map the whole
+ * paddr - (paddr + size) might be partial page, we should map the whole
* page. Note: if two part of one page are separately mapped, we
- * might have two guest_addr mapping to the same host addr, but this
+ * might have two guest_addr mapping to the same host paddr, but this
* is not a big problem
*/
- ret = domain_page_mapping(domain, start_addr,
- ((u64)addr) & PAGE_MASK_4K, size, prot);
+ ret = domain_page_mapping(domain, start_paddr,
+ ((u64)paddr) & PAGE_MASK_4K, size, prot);
if (ret)
goto error;
pr_debug("Device %s request: %lx@%llx mapping: %lx@%llx, dir %d\n",
- pci_name(pdev), size, (u64)addr,
- size, (u64)start_addr, dir);
+ pci_name(pdev), size, (u64)paddr,
+ size, (u64)start_paddr, dir);
/* it's a non-present to present mapping */
ret = iommu_flush_iotlb_psi(domain->iommu, domain->id,
- start_addr, size >> PAGE_SHIFT_4K, 1);
+ start_paddr, size >> PAGE_SHIFT_4K, 1);
if (ret)
iommu_flush_write_buffer(domain->iommu);
- return (start_addr + ((u64)addr & (~PAGE_MASK_4K)));
+ return (start_paddr + ((u64)paddr & (~PAGE_MASK_4K)));
error:
if (iova)
__free_iova(&domain->iovad, iova);
printk(KERN_ERR"Device %s request: %lx@%llx dir %d --- failed\n",
- pci_name(pdev), size, (u64)addr, dir);
+ pci_name(pdev), size, (u64)paddr, dir);
return 0;
}
@@ -2082,7 +2081,7 @@ static void * intel_alloc_coherent(struc
return NULL;
memset(vaddr, 0, size);
- *dma_handle = intel_map_single(hwdev, vaddr, size, DMA_BIDIRECTIONAL);
+ *dma_handle = intel_map_single(hwdev, virt_to_bus(vaddr), size, DMA_BIDIRECTIONAL);
if (*dma_handle)
return vaddr;
free_pages((unsigned long)vaddr, order);
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