linux-kernel - Re: [PATCH kernel v10 08/34] vfio: powerpc/spapr: Use it_page

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Date:	Wed, 13 May 2015 16:12:07 +1000
From:	Gavin Shan <gwshan@...ux.vnet.ibm.com>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	David Gibson <david@...son.dropbear.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	Wei Yang <weiyang@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH kernel v10 08/34] vfio: powerpc/spapr: Use it_page_size

On Tue, May 12, 2015 at 01:38:57AM +1000, Alexey Kardashevskiy wrote:
>This makes use of the it_page_size from the iommu_table struct
>as page size can differ.
>
>This replaces missing IOMMU_PAGE_SHIFT macro in commented debug code
>as recently introduced IOMMU_PAGE_XXX macros do not include
>IOMMU_PAGE_SHIFT.
>
>Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
>Reviewed-by: David Gibson <david@...son.dropbear.id.au>
>[aw: for the vfio related changes]
>Acked-by: Alex Williamson <alex.williamson@...hat.com>

Reviewed-by: Gavin Shan <gwshan@...ux.vnet.ibm.com>

Thanks,
Gavin

>---
> drivers/vfio/vfio_iommu_spapr_tce.c | 26 +++++++++++++-------------
> 1 file changed, 13 insertions(+), 13 deletions(-)
>
>diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
>index 735b308..64300cc 100644
>--- a/drivers/vfio/vfio_iommu_spapr_tce.c
>+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
>@@ -91,7 +91,7 @@ static int tce_iommu_enable(struct tce_container *container)
> 	 * enforcing the limit based on the max that the guest can map.
> 	 */
> 	down_write(&current->mm->mmap_sem);
>-	npages = (tbl->it_size << IOMMU_PAGE_SHIFT_4K) >> PAGE_SHIFT;
>+	npages = (tbl->it_size << tbl->it_page_shift) >> PAGE_SHIFT;
> 	locked = current->mm->locked_vm + npages;
> 	lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
> 	if (locked > lock_limit && !capable(CAP_IPC_LOCK)) {
>@@ -120,7 +120,7 @@ static void tce_iommu_disable(struct tce_container *container)
>
> 	down_write(&current->mm->mmap_sem);
> 	current->mm->locked_vm -= (container->tbl->it_size <<
>-			IOMMU_PAGE_SHIFT_4K) >> PAGE_SHIFT;
>+			container->tbl->it_page_shift) >> PAGE_SHIFT;
> 	up_write(&current->mm->mmap_sem);
> }
>
>@@ -215,7 +215,7 @@ static long tce_iommu_build(struct tce_container *container,
> 					tce, ret);
> 			break;
> 		}
>-		tce += IOMMU_PAGE_SIZE_4K;
>+		tce += IOMMU_PAGE_SIZE(tbl);
> 	}
>
> 	if (ret)
>@@ -260,8 +260,8 @@ static long tce_iommu_ioctl(void *iommu_data,
> 		if (info.argsz < minsz)
> 			return -EINVAL;
>
>-		info.dma32_window_start = tbl->it_offset << IOMMU_PAGE_SHIFT_4K;
>-		info.dma32_window_size = tbl->it_size << IOMMU_PAGE_SHIFT_4K;
>+		info.dma32_window_start = tbl->it_offset << tbl->it_page_shift;
>+		info.dma32_window_size = tbl->it_size << tbl->it_page_shift;
> 		info.flags = 0;
>
> 		if (copy_to_user((void __user *)arg, &info, minsz))
>@@ -291,8 +291,8 @@ static long tce_iommu_ioctl(void *iommu_data,
> 				VFIO_DMA_MAP_FLAG_WRITE))
> 			return -EINVAL;
>
>-		if ((param.size & ~IOMMU_PAGE_MASK_4K) ||
>-				(param.vaddr & ~IOMMU_PAGE_MASK_4K))
>+		if ((param.size & ~IOMMU_PAGE_MASK(tbl)) ||
>+				(param.vaddr & ~IOMMU_PAGE_MASK(tbl)))
> 			return -EINVAL;
>
> 		/* iova is checked by the IOMMU API */
>@@ -307,8 +307,8 @@ static long tce_iommu_ioctl(void *iommu_data,
> 			return ret;
>
> 		ret = tce_iommu_build(container, tbl,
>-				param.iova >> IOMMU_PAGE_SHIFT_4K,
>-				tce, param.size >> IOMMU_PAGE_SHIFT_4K);
>+				param.iova >> tbl->it_page_shift,
>+				tce, param.size >> tbl->it_page_shift);
>
> 		iommu_flush_tce(tbl);
>
>@@ -334,17 +334,17 @@ static long tce_iommu_ioctl(void *iommu_data,
> 		if (param.flags)
> 			return -EINVAL;
>
>-		if (param.size & ~IOMMU_PAGE_MASK_4K)
>+		if (param.size & ~IOMMU_PAGE_MASK(tbl))
> 			return -EINVAL;
>
> 		ret = iommu_tce_clear_param_check(tbl, param.iova, 0,
>-				param.size >> IOMMU_PAGE_SHIFT_4K);
>+				param.size >> tbl->it_page_shift);
> 		if (ret)
> 			return ret;
>
> 		ret = tce_iommu_clear(container, tbl,
>-				param.iova >> IOMMU_PAGE_SHIFT_4K,
>-				param.size >> IOMMU_PAGE_SHIFT_4K);
>+				param.iova >> tbl->it_page_shift,
>+				param.size >> tbl->it_page_shift);
> 		iommu_flush_tce(tbl);
>
> 		return ret;
>-- 
>2.4.0.rc3.8.gfb3e7d5
>

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