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Date: Wed, 5 Aug 2015 17:18:36 +0200
From: Joerg Roedel <joro@...tes.org>
To: iommu@...ts.linux-foundation.org
Cc: David Woodhouse <dwmw2@...radead.org>,
Alex Williamson <alex.williamson@...hat.com>,
linux-kernel@...r.kernel.org, Joerg Roedel <joro@...tes.org>,
jroedel@...e.de
Subject: [PATCH 05/26] iommu/vt-d: Calculate translation in domain_context_mapping_one
From: Joerg Roedel <jroedel@...e.de>
There is no reason to pass the translation type through
multiple layers. It can also be determined in the
domain_context_mapping_one function directly.
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
drivers/iommu/intel-iommu.c | 50 ++++++++++++++++++++++-----------------------
1 file changed, 24 insertions(+), 26 deletions(-)
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 58fc4bb..1a934f8 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -364,7 +364,8 @@ static inline int first_pte_in_page(struct dma_pte *pte)
static struct dmar_domain *si_domain;
static int hw_pass_through = 1;
-/* domain represents a virtual machine, more than one devices
+/*
+ * Domain represents a virtual machine, more than one devices
* across iommus may be owned in one domain, e.g. kvm guest.
*/
#define DOMAIN_FLAG_VIRTUAL_MACHINE (1 << 0)
@@ -638,6 +639,11 @@ static inline int domain_type_is_vm(struct dmar_domain *domain)
return domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE;
}
+static inline int domain_type_is_si(struct dmar_domain *domain)
+{
+ return domain->flags & DOMAIN_FLAG_STATIC_IDENTITY;
+}
+
static inline int domain_type_is_vm_or_si(struct dmar_domain *domain)
{
return domain->flags & (DOMAIN_FLAG_VIRTUAL_MACHINE |
@@ -1904,21 +1910,24 @@ static void domain_exit(struct dmar_domain *domain)
static int domain_context_mapping_one(struct dmar_domain *domain,
struct intel_iommu *iommu,
- u8 bus, u8 devfn, int translation)
+ u8 bus, u8 devfn)
{
+ int translation = CONTEXT_TT_MULTI_LEVEL;
+ struct device_domain_info *info = NULL;
struct context_entry *context;
unsigned long flags;
struct dma_pte *pgd;
int id;
int agaw;
- struct device_domain_info *info = NULL;
+
+ translation = CONTEXT_TT_MULTI_LEVEL;
+ if (hw_pass_through && domain_type_is_si(domain))
+ translation = CONTEXT_TT_PASS_THROUGH;
pr_debug("Set context mapping for %02x:%02x.%d\n",
bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
BUG_ON(!domain->pgd);
- BUG_ON(translation != CONTEXT_TT_PASS_THROUGH &&
- translation != CONTEXT_TT_MULTI_LEVEL);
spin_lock_irqsave(&iommu->lock, flags);
context = iommu_context_addr(iommu, bus, devfn, 1);
@@ -2010,7 +2019,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
struct domain_context_mapping_data {
struct dmar_domain *domain;
struct intel_iommu *iommu;
- int translation;
};
static int domain_context_mapping_cb(struct pci_dev *pdev,
@@ -2019,13 +2027,11 @@ static int domain_context_mapping_cb(struct pci_dev *pdev,
struct domain_context_mapping_data *data = opaque;
return domain_context_mapping_one(data->domain, data->iommu,
- PCI_BUS_NUM(alias), alias & 0xff,
- data->translation);
+ PCI_BUS_NUM(alias), alias & 0xff);
}
static int
-domain_context_mapping(struct dmar_domain *domain, struct device *dev,
- int translation)
+domain_context_mapping(struct dmar_domain *domain, struct device *dev)
{
struct intel_iommu *iommu;
u8 bus, devfn;
@@ -2036,12 +2042,10 @@ domain_context_mapping(struct dmar_domain *domain, struct device *dev,
return -ENODEV;
if (!dev_is_pci(dev))
- return domain_context_mapping_one(domain, iommu, bus, devfn,
- translation);
+ return domain_context_mapping_one(domain, iommu, bus, devfn);
data.domain = domain;
data.iommu = iommu;
- data.translation = translation;
return pci_for_each_dma_alias(to_pci_dev(dev),
&domain_context_mapping_cb, &data);
@@ -2508,7 +2512,7 @@ static int iommu_prepare_identity_map(struct device *dev,
goto error;
/* context entry init */
- ret = domain_context_mapping(domain, dev, CONTEXT_TT_MULTI_LEVEL);
+ ret = domain_context_mapping(domain, dev);
if (ret)
goto error;
@@ -2621,8 +2625,7 @@ static int identity_mapping(struct device *dev)
return 0;
}
-static int domain_add_dev_info(struct dmar_domain *domain,
- struct device *dev, int translation)
+static int domain_add_dev_info(struct dmar_domain *domain, struct device *dev)
{
struct dmar_domain *ndomain;
struct intel_iommu *iommu;
@@ -2637,7 +2640,7 @@ static int domain_add_dev_info(struct dmar_domain *domain,
if (ndomain != domain)
return -EBUSY;
- ret = domain_context_mapping(domain, dev, translation);
+ ret = domain_context_mapping(domain, dev);
if (ret) {
domain_remove_one_dev_info(domain, dev);
return ret;
@@ -2782,9 +2785,7 @@ static int __init dev_prepare_static_identity_mapping(struct device *dev, int hw
if (!iommu_should_identity_map(dev, 1))
return 0;
- ret = domain_add_dev_info(si_domain, dev,
- hw ? CONTEXT_TT_PASS_THROUGH :
- CONTEXT_TT_MULTI_LEVEL);
+ ret = domain_add_dev_info(si_domain, dev);
if (!ret)
pr_info("%s identity mapping for device %s\n",
hw ? "Hardware" : "Software", dev_name(dev));
@@ -3311,7 +3312,7 @@ static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev)
/* make sure context mapping is ok */
if (unlikely(!domain_context_mapped(dev))) {
- ret = domain_context_mapping(domain, dev, CONTEXT_TT_MULTI_LEVEL);
+ ret = domain_context_mapping(domain, dev);
if (ret) {
pr_err("Domain context map for %s failed\n",
dev_name(dev));
@@ -3366,10 +3367,7 @@ static int iommu_no_mapping(struct device *dev)
*/
if (iommu_should_identity_map(dev, 0)) {
int ret;
- ret = domain_add_dev_info(si_domain, dev,
- hw_pass_through ?
- CONTEXT_TT_PASS_THROUGH :
- CONTEXT_TT_MULTI_LEVEL);
+ ret = domain_add_dev_info(si_domain, dev);
if (!ret) {
pr_info("64bit %s uses identity mapping\n",
dev_name(dev));
@@ -4786,7 +4784,7 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
dmar_domain->agaw--;
}
- return domain_add_dev_info(dmar_domain, dev, CONTEXT_TT_MULTI_LEVEL);
+ return domain_add_dev_info(dmar_domain, dev);
}
static void intel_iommu_detach_device(struct iommu_domain *domain,
--
1.9.1
--
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