| Message ID | 20230928071528.26258-7-yi.l.liu@intel.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | iommufd support allocating nested parent domain | expand |
On 9/28/23 3:15 PM, Yi Liu wrote: > This adds the domain_alloc_user op implementation. It supports allocating > domains to be used as parent under nested translation. > > Signed-off-by: Yi Liu<yi.l.liu@intel.com> > --- > drivers/iommu/intel/iommu.c | 28 ++++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com> Best regards, baolu
> From: Liu, Yi L <yi.l.liu@intel.com> > Sent: Thursday, September 28, 2023 3:15 PM > > This adds the domain_alloc_user op implementation. It supports allocating > domains to be used as parent under nested translation. > > Signed-off-by: Yi Liu <yi.l.liu@intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
On Thu, Sep 28, 2023 at 12:15:28AM -0700, Yi Liu wrote: > This adds the domain_alloc_user op implementation. It supports allocating > domains to be used as parent under nested translation. > > Signed-off-by: Yi Liu <yi.l.liu@intel.com> > --- > drivers/iommu/intel/iommu.c | 28 ++++++++++++++++++++++++++++ > 1 file changed, 28 insertions(+) > > diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c > index 5db283c17e0d..017aed5813d8 100644 > --- a/drivers/iommu/intel/iommu.c > +++ b/drivers/iommu/intel/iommu.c > @@ -4074,6 +4074,33 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type) > return NULL; > } > > +static struct iommu_domain * > +intel_iommu_domain_alloc_user(struct device *dev, u32 flags) > +{ > + struct iommu_domain *domain; > + struct intel_iommu *iommu; > + > + if (flags & (~IOMMU_HWPT_ALLOC_NEST_PARENT)) > + return ERR_PTR(-EOPNOTSUPP); > + > + iommu = device_to_iommu(dev, NULL, NULL); > + if (!iommu) > + return ERR_PTR(-ENODEV); Why isn't this just struct device_domain_info *info = dev_iommu_priv_get(dev) struct intel_iommu *iommu = info->iommu ??? Same question for almost all other calls to this function! The one in probe is reasonable, but I don't think it should be ever called again. I'm going to leave this, but please make a series cleaning all the device_to_iommu() stuff next cycle.. Jason
On 10/11/23 12:43 AM, Jason Gunthorpe wrote: > On Thu, Sep 28, 2023 at 12:15:28AM -0700, Yi Liu wrote: >> This adds the domain_alloc_user op implementation. It supports allocating >> domains to be used as parent under nested translation. >> >> Signed-off-by: Yi Liu<yi.l.liu@intel.com> >> --- >> drivers/iommu/intel/iommu.c | 28 ++++++++++++++++++++++++++++ >> 1 file changed, 28 insertions(+) >> >> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c >> index 5db283c17e0d..017aed5813d8 100644 >> --- a/drivers/iommu/intel/iommu.c >> +++ b/drivers/iommu/intel/iommu.c >> @@ -4074,6 +4074,33 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type) >> return NULL; >> } >> >> +static struct iommu_domain * >> +intel_iommu_domain_alloc_user(struct device *dev, u32 flags) >> +{ >> + struct iommu_domain *domain; >> + struct intel_iommu *iommu; >> + >> + if (flags & (~IOMMU_HWPT_ALLOC_NEST_PARENT)) >> + return ERR_PTR(-EOPNOTSUPP); >> + >> + iommu = device_to_iommu(dev, NULL, NULL); >> + if (!iommu) >> + return ERR_PTR(-ENODEV); > Why isn't this just > > struct device_domain_info *info = dev_iommu_priv_get(dev) > struct intel_iommu *iommu = info->iommu > > ??? > > Same question for almost all other calls to this function! The one in > probe is reasonable, but I don't think it should be ever called again. > > I'm going to leave this, but please make a series cleaning all the > device_to_iommu() stuff next cycle.. Sure. I also have a plan to do this. device_to_iommu() is only needed in the probe path. For runtime callbacks, we can just retrieve it from the device's iommu private data. Best regards, baolu
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index 5db283c17e0d..017aed5813d8 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -4074,6 +4074,33 @@ static struct iommu_domain *intel_iommu_domain_alloc(unsigned type) return NULL; } +static struct iommu_domain * +intel_iommu_domain_alloc_user(struct device *dev, u32 flags) +{ + struct iommu_domain *domain; + struct intel_iommu *iommu; + + if (flags & (~IOMMU_HWPT_ALLOC_NEST_PARENT)) + return ERR_PTR(-EOPNOTSUPP); + + iommu = device_to_iommu(dev, NULL, NULL); + if (!iommu) + return ERR_PTR(-ENODEV); + + if ((flags & IOMMU_HWPT_ALLOC_NEST_PARENT) && !ecap_nest(iommu->ecap)) + return ERR_PTR(-EOPNOTSUPP); + + /* + * domain_alloc_user op needs to fully initialize a domain + * before return, so uses iommu_domain_alloc() here for + * simple. + */ + domain = iommu_domain_alloc(dev->bus); + if (!domain) + domain = ERR_PTR(-ENOMEM); + return domain; +} + static void intel_iommu_domain_free(struct iommu_domain *domain) { if (domain != &si_domain->domain && domain != &blocking_domain) @@ -4807,6 +4834,7 @@ const struct iommu_ops intel_iommu_ops = { .capable = intel_iommu_capable, .hw_info = intel_iommu_hw_info, .domain_alloc = intel_iommu_domain_alloc, + .domain_alloc_user = intel_iommu_domain_alloc_user, .probe_device = intel_iommu_probe_device, .probe_finalize = intel_iommu_probe_finalize, .release_device = intel_iommu_release_device,
This adds the domain_alloc_user op implementation. It supports allocating domains to be used as parent under nested translation. Signed-off-by: Yi Liu <yi.l.liu@intel.com> --- drivers/iommu/intel/iommu.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+)