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Subject[PATCH v2 06/10] iommu/vt-d: Add bounce buffer API for dma sync
Date
This adds the APIs for bounce buffer specified dma sync
ops.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Xu Pengfei <pengfei.xu@intel.com>
Tested-by: Mika Westerberg <mika.westerberg@intel.com>
---
drivers/iommu/intel-pgtable.c | 44 +++++++++++++++++++++++++++++++++++
include/linux/intel-iommu.h | 4 ++++
2 files changed, 48 insertions(+)

diff --git a/drivers/iommu/intel-pgtable.c b/drivers/iommu/intel-pgtable.c
index 1e56ea07f755..fbe1d0e073fd 100644
--- a/drivers/iommu/intel-pgtable.c
+++ b/drivers/iommu/intel-pgtable.c
@@ -242,6 +242,35 @@ bounce_sync(phys_addr_t orig_addr, phys_addr_t bounce_addr,
return 0;
}

+static int
+bounce_sync_single(struct device *dev, struct dmar_domain *domain,
+ dma_addr_t addr, phys_addr_t paddr, size_t size,
+ enum dma_data_direction dir, unsigned long attrs,
+ void *data)
+{
+ enum dma_sync_target *target = data;
+ struct bounce_cookie *cookie;
+ unsigned long flags;
+
+ spin_lock_irqsave(&bounce_lock, flags);
+ cookie = idr_find(&domain->bounce_idr, addr >> PAGE_SHIFT);
+ spin_unlock_irqrestore(&bounce_lock, flags);
+ if (!cookie)
+ return 0;
+
+ if (*target == SYNC_FOR_DEVICE) {
+ if (dir == DMA_BIDIRECTIONAL || dir == DMA_TO_DEVICE)
+ bounce_sync(cookie->original_phys, cookie->bounce_phys,
+ size, DMA_TO_DEVICE);
+ } else {
+ if (dir == DMA_BIDIRECTIONAL || dir == DMA_FROM_DEVICE)
+ bounce_sync(cookie->original_phys, cookie->bounce_phys,
+ size, DMA_FROM_DEVICE);
+ }
+
+ return 0;
+}
+
static int bounce_map(struct device *dev, struct dmar_domain *domain,
dma_addr_t addr, phys_addr_t paddr, size_t size,
enum dma_data_direction dir, unsigned long attrs,
@@ -315,6 +344,11 @@ static const struct addr_walk walk_bounce_unmap = {
.high = bounce_unmap,
};

+static const struct addr_walk walk_bounce_sync_single = {
+ .low = bounce_sync_single,
+ .high = bounce_sync_single,
+};
+
static int
domain_walk_addr_range(const struct addr_walk *walk, struct device *dev,
struct dmar_domain *domain, dma_addr_t addr,
@@ -401,3 +435,13 @@ int domain_bounce_unmap(struct device *dev, dma_addr_t addr,
return domain_walk_addr_range(&walk_bounce_unmap, dev, domain,
addr, 0, size, dir, attrs, data);
}
+
+int domain_bounce_sync_single(struct device *dev, dma_addr_t addr,
+ size_t size, enum dma_data_direction dir,
+ void *data)
+{
+ struct dmar_domain *domain = get_valid_domain_for_dev(dev);
+
+ return domain_walk_addr_range(&walk_bounce_sync_single, dev,
+ domain, addr, 0, size, dir, 0, data);
+}
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 8fd1768f8729..58f192c1f26f 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -31,6 +31,7 @@
#include <linux/iommu.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/dmar.h>
+#include <linux/swiotlb.h>

#include <asm/cacheflush.h>
#include <asm/iommu.h>
@@ -695,6 +696,9 @@ int domain_bounce_map(struct device *dev, dma_addr_t addr, phys_addr_t paddr,
int domain_bounce_unmap(struct device *dev, dma_addr_t addr,
size_t size, enum dma_data_direction dir,
unsigned long attrs, void *data);
+int domain_bounce_sync_single(struct device *dev, dma_addr_t addr,
+ size_t size, enum dma_data_direction dir,
+ void *data);
#ifdef CONFIG_INTEL_IOMMU_SVM
int intel_svm_init(struct intel_iommu *iommu);
extern int intel_svm_enable_prq(struct intel_iommu *iommu);
--
2.17.1
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