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Date: Tue, 12 Mar 2019 14:00:01 +0800
From: Lu Baolu <baolu.lu@...ux.intel.com>
To: David Woodhouse <dwmw2@...radead.org>,
Joerg Roedel <joro@...tes.org>, ashok.raj@...el.com,
jacob.jun.pan@...el.com, alan.cox@...el.com, kevin.tian@...el.com,
mika.westerberg@...ux.intel.com, pengfei.xu@...el.com
Cc: iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
Lu Baolu <baolu.lu@...ux.intel.com>,
Jacob Pan <jacob.jun.pan@...ux.intel.com>
Subject: [PATCH v1 5/9] iommu/vt-d: Add bounce buffer API for dma sync
This adds the APIs for bounce buffer specified dma sync
ops.
Cc: Ashok Raj <ashok.raj@...el.com>
Cc: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
Tested-by: Xu Pengfei <pengfei.xu@...el.com>
Tested-by: Mika Westerberg <mika.westerberg@...el.com>
---
drivers/iommu/intel-pgtable.c | 112 ++++++++++++++++++++++++++++++++++
include/linux/intel-iommu.h | 6 ++
2 files changed, 118 insertions(+)
diff --git a/drivers/iommu/intel-pgtable.c b/drivers/iommu/intel-pgtable.c
index e8317982c5ab..d175045fe236 100644
--- a/drivers/iommu/intel-pgtable.c
+++ b/drivers/iommu/intel-pgtable.c
@@ -331,6 +331,100 @@ static const struct addr_walk walk_bounce_unmap = {
.high = bounce_unmap_high,
};
+static int
+bounce_sync_iova_pfn(struct dmar_domain *domain, dma_addr_t addr,
+ size_t size, struct bounce_param *param,
+ enum dma_data_direction dir)
+{
+ 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;
+
+ return bounce_sync(cookie->original_phys, cookie->bounce_phys,
+ size, dir);
+}
+
+static int
+bounce_sync_for_device_low(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param)
+{
+ if (param->dir == DMA_BIDIRECTIONAL || param->dir == DMA_TO_DEVICE)
+ return bounce_sync_iova_pfn(domain, addr, size,
+ param, DMA_TO_DEVICE);
+
+ return 0;
+}
+
+static int
+bounce_sync_for_device_middle(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param)
+{
+ return 0;
+}
+
+static int
+bounce_sync_for_device_high(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param)
+{
+ if (param->dir == DMA_BIDIRECTIONAL || param->dir == DMA_TO_DEVICE)
+ return bounce_sync_iova_pfn(domain, addr, size,
+ param, DMA_TO_DEVICE);
+
+ return 0;
+}
+
+const struct addr_walk walk_bounce_sync_for_device = {
+ .low = bounce_sync_for_device_low,
+ .middle = bounce_sync_for_device_middle,
+ .high = bounce_sync_for_device_high,
+};
+
+static int
+bounce_sync_for_cpu_low(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param)
+{
+ if (param->dir == DMA_BIDIRECTIONAL || param->dir == DMA_FROM_DEVICE)
+ return bounce_sync_iova_pfn(domain, addr, size,
+ param, DMA_FROM_DEVICE);
+
+ return 0;
+}
+
+static int
+bounce_sync_for_cpu_middle(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param)
+{
+ return 0;
+}
+
+static int
+bounce_sync_for_cpu_high(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param)
+{
+ if (param->dir == DMA_BIDIRECTIONAL || param->dir == DMA_FROM_DEVICE)
+ return bounce_sync_iova_pfn(domain, addr, size,
+ param, DMA_FROM_DEVICE);
+
+ return 0;
+}
+
+const struct addr_walk walk_bounce_sync_for_cpu = {
+ .low = bounce_sync_for_cpu_low,
+ .middle = bounce_sync_for_cpu_middle,
+ .high = bounce_sync_for_cpu_high,
+};
+
static int
domain_walk_addr_range(const struct addr_walk *walk,
struct dmar_domain *domain,
@@ -404,3 +498,21 @@ domain_bounce_unmap(struct dmar_domain *domain, dma_addr_t addr,
return domain_walk_addr_range(&walk_bounce_unmap, domain,
addr, paddr, size, param);
}
+
+int
+domain_bounce_sync_for_device(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param)
+{
+ return domain_walk_addr_range(&walk_bounce_sync_for_device, domain,
+ addr, paddr, size, param);
+}
+
+int
+domain_bounce_sync_for_cpu(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param)
+{
+ return domain_walk_addr_range(&walk_bounce_sync_for_cpu, domain,
+ addr, paddr, size, param);
+}
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 8b5ba91ab606..f4f313df7249 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -681,6 +681,12 @@ int domain_bounce_map(struct dmar_domain *domain, dma_addr_t addr,
int domain_bounce_unmap(struct dmar_domain *domain, dma_addr_t addr,
phys_addr_t paddr, size_t size,
struct bounce_param *param);
+int domain_bounce_sync_for_device(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param);
+int domain_bounce_sync_for_cpu(struct dmar_domain *domain, dma_addr_t addr,
+ phys_addr_t paddr, size_t size,
+ struct bounce_param *param);
#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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