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Date: Thu, 06 Aug 2015 13:20:01 -0600
From: Alex Williamson <alex.williamson@...hat.com>
To: Joerg Roedel <joro@...tes.org>
Cc: iommu@...ts.linux-foundation.org,
David Woodhouse <dwmw2@...radead.org>,
linux-kernel@...r.kernel.org, jroedel@...e.de
Subject: Re: [PATCH 05/26] iommu/vt-d: Calculate translation in
domain_context_mapping_one
On Wed, 2015-08-05 at 17:18 +0200, Joerg Roedel wrote:
> 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;
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
I'm sure this is already part of your cleanup.
> + 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,
--
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