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SubjectRe: [PATCH v5 3/8] iommu/vt-d: Move common code out of iommu_attch_device()
On Thu, 10 Jan 2019 11:00:22 +0800
Lu Baolu <baolu.lu@linux.intel.com> wrote:

> This part of code could be used by both normal and aux
> domain specific attach entries. Hence move them into a
> common function to avoid duplication.
>
> Cc: Ashok Raj <ashok.raj@intel.com>
> Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
> Cc: Kevin Tian <kevin.tian@intel.com>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Another trivial one (it's going to be one of those days).
Typo in the patch title.

> ---
> drivers/iommu/intel-iommu.c | 60 ++++++++++++++++++++++---------------
> 1 file changed, 36 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index ee8832d26f7e..e9119d45a29d 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -5058,35 +5058,14 @@ static void intel_iommu_domain_free(struct iommu_domain *domain)
> domain_exit(to_dmar_domain(domain));
> }
>
> -static int intel_iommu_attach_device(struct iommu_domain *domain,
> - struct device *dev)
> +static int prepare_domain_attach_device(struct iommu_domain *domain,
> + struct device *dev)
> {
> struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> struct intel_iommu *iommu;
> int addr_width;
> u8 bus, devfn;
>
> - if (device_is_rmrr_locked(dev)) {
> - dev_warn(dev, "Device is ineligible for IOMMU domain attach due to platform RMRR requirement. Contact your platform vendor.\n");
> - return -EPERM;
> - }
> -
> - /* normally dev is not mapped */
> - if (unlikely(domain_context_mapped(dev))) {
> - struct dmar_domain *old_domain;
> -
> - old_domain = find_domain(dev);
> - if (old_domain) {
> - rcu_read_lock();
> - dmar_remove_one_dev_info(old_domain, dev);
> - rcu_read_unlock();
> -
> - if (!domain_type_is_vm_or_si(old_domain) &&
> - list_empty(&old_domain->devices))
> - domain_exit(old_domain);
> - }
> - }
> -
> iommu = device_to_iommu(dev, &bus, &devfn);
> if (!iommu)
> return -ENODEV;
> @@ -5119,7 +5098,40 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
> dmar_domain->agaw--;
> }
>
> - return domain_add_dev_info(dmar_domain, dev);
> + return 0;
> +}
> +
> +static int intel_iommu_attach_device(struct iommu_domain *domain,
> + struct device *dev)
> +{
> + int ret;
> +
> + if (device_is_rmrr_locked(dev)) {
> + dev_warn(dev, "Device is ineligible for IOMMU domain attach due to platform RMRR requirement. Contact your platform vendor.\n");
> + return -EPERM;
> + }
> +
> + /* normally dev is not mapped */
> + if (unlikely(domain_context_mapped(dev))) {
> + struct dmar_domain *old_domain;
> +
> + old_domain = find_domain(dev);
> + if (old_domain) {
> + rcu_read_lock();
> + dmar_remove_one_dev_info(old_domain, dev);
> + rcu_read_unlock();
> +
> + if (!domain_type_is_vm_or_si(old_domain) &&
> + list_empty(&old_domain->devices))
> + domain_exit(old_domain);
> + }
> + }
> +
> + ret = prepare_domain_attach_device(domain, dev);
> + if (ret)
> + return ret;
> +
> + return domain_add_dev_info(to_dmar_domain(domain), dev);
> }
>
> static void intel_iommu_detach_device(struct iommu_domain *domain,


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