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Message-Id: <1403686967-10887-11-git-send-email-jiang.liu@linux.intel.com>
Date: Wed, 25 Jun 2014 17:02:36 +0800
From: Jiang Liu <jiang.liu@...ux.intel.com>
To: Joerg Roedel <joro@...tes.org>,
David Woodhouse <dwmw2@...radead.org>,
Yinghai Lu <yinghai@...nel.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Dan Williams <dan.j.williams@...el.com>,
Vinod Koul <vinod.koul@...el.com>,
"Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Cc: Jiang Liu <jiang.liu@...ux.intel.com>,
Ashok Raj <ashok.raj@...el.com>,
Yijing Wang <wangyijing@...wei.com>,
Tony Luck <tony.luck@...el.com>,
iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
linux-hotplug@...r.kernel.org, linux-kernel@...r.kernel.org,
dmaengine@...r.kernel.org
Subject: [Patch Part3 V3 10/21] iommu/vt-d: simplify intel_unmap_sg() and kill duplicated code
Introduce intel_unmap() to reduce duplicated code in intel_unmap_sg()
and intel_unmap_page().
Also let dma_pte_free_pagetable() to call dma_pte_clear_range() directly,
so caller only needs to call dma_pte_free_pagetable().
Signed-off-by: Jiang Liu <jiang.liu@...ux.intel.com>
---
drivers/iommu/intel-iommu.c | 70 ++++++++++++-------------------------------
1 file changed, 19 insertions(+), 51 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 15a2828bf447..20c0d92ea2d3 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -987,6 +987,8 @@ static void dma_pte_free_pagetable(struct dmar_domain *domain,
BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width);
BUG_ON(start_pfn > last_pfn);
+ dma_pte_clear_range(domain, start_pfn, last_pfn);
+
/* We don't need lock here; nobody else touches the iova range */
dma_pte_free_level(domain, agaw_to_level(domain->agaw),
domain->pgd, 0, start_pfn, last_pfn);
@@ -2031,12 +2033,14 @@ static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
/* It is large page*/
if (largepage_lvl > 1) {
pteval |= DMA_PTE_LARGE_PAGE;
- /* Ensure that old small page tables are removed to make room
- for superpage, if they exist. */
- dma_pte_clear_range(domain, iov_pfn,
- iov_pfn + lvl_to_nr_pages(largepage_lvl) - 1);
+ lvl_pages = lvl_to_nr_pages(largepage_lvl);
+ /*
+ * Ensure that old small page tables are
+ * removed to make room for superpage,
+ * if they exist.
+ */
dma_pte_free_pagetable(domain, iov_pfn,
- iov_pfn + lvl_to_nr_pages(largepage_lvl) - 1);
+ iov_pfn + lvl_pages - 1);
} else {
pteval &= ~(uint64_t)DMA_PTE_LARGE_PAGE;
}
@@ -3164,9 +3168,7 @@ static void add_unmap(struct dmar_domain *dom, struct iova *iova, struct page *f
spin_unlock_irqrestore(&async_umap_flush_lock, flags);
}
-static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
- size_t size, enum dma_data_direction dir,
- struct dma_attrs *attrs)
+static void intel_unmap(struct device *dev, dma_addr_t dev_addr)
{
struct dmar_domain *domain;
unsigned long start_pfn, last_pfn;
@@ -3210,6 +3212,13 @@ static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
}
}
+static void intel_unmap_page(struct device *dev, dma_addr_t dev_addr,
+ size_t size, enum dma_data_direction dir,
+ struct dma_attrs *attrs)
+{
+ intel_unmap(dev, dev_addr);
+}
+
static void *intel_alloc_coherent(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flags,
struct dma_attrs *attrs)
@@ -3266,7 +3275,7 @@ static void intel_free_coherent(struct device *dev, size_t size, void *vaddr,
size = PAGE_ALIGN(size);
order = get_order(size);
- intel_unmap_page(dev, dma_handle, size, DMA_BIDIRECTIONAL, NULL);
+ intel_unmap(dev, dma_handle);
if (!dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT))
__free_pages(page, order);
}
@@ -3275,43 +3284,7 @@ static void intel_unmap_sg(struct device *dev, struct scatterlist *sglist,
int nelems, enum dma_data_direction dir,
struct dma_attrs *attrs)
{
- struct dmar_domain *domain;
- unsigned long start_pfn, last_pfn;
- struct iova *iova;
- struct intel_iommu *iommu;
- struct page *freelist;
-
- if (iommu_no_mapping(dev))
- return;
-
- domain = find_domain(dev);
- BUG_ON(!domain);
-
- iommu = domain_get_iommu(domain);
-
- iova = find_iova(&domain->iovad, IOVA_PFN(sglist[0].dma_address));
- if (WARN_ONCE(!iova, "Driver unmaps unmatched sglist at PFN %llx\n",
- (unsigned long long)sglist[0].dma_address))
- return;
-
- start_pfn = mm_to_dma_pfn(iova->pfn_lo);
- last_pfn = mm_to_dma_pfn(iova->pfn_hi + 1) - 1;
-
- freelist = domain_unmap(domain, start_pfn, last_pfn);
-
- if (intel_iommu_strict) {
- iommu_flush_iotlb_psi(iommu, domain->id, start_pfn,
- last_pfn - start_pfn + 1, !freelist, 0);
- /* free iova */
- __free_iova(&domain->iovad, iova);
- dma_free_pagelist(freelist);
- } else {
- add_unmap(domain, iova, freelist);
- /*
- * queue up the release of the unmap to save the 1/6th of the
- * cpu used up by the iotlb flush operation...
- */
- }
+ intel_unmap(dev, sglist[0].dma_address);
}
static int intel_nontranslate_map_sg(struct device *hddev,
@@ -3375,13 +3348,8 @@ static int intel_map_sg(struct device *dev, struct scatterlist *sglist, int nele
ret = domain_sg_mapping(domain, start_vpfn, sglist, size, prot);
if (unlikely(ret)) {
- /* clear the page */
- dma_pte_clear_range(domain, start_vpfn,
- start_vpfn + size - 1);
- /* free page tables */
dma_pte_free_pagetable(domain, start_vpfn,
start_vpfn + size - 1);
- /* free iova */
__free_iova(&domain->iovad, iova);
return 0;
}
--
1.7.10.4
--
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