Message ID | 1402935486-29136-11-git-send-email-julien.grall@linaro.org |
---|---|
State | Superseded, archived |
Headers | show |
On Mon, 2014-06-16 at 17:17 +0100, Julien Grall wrote: > This new function will correctly initialize the IOMMU page table for the > current domain. _setup, _configure, _initialise, _construct etc would be more normal names I think. "buildup" is the half hour of mindless blather from pundits that you have to watch before a televised sporting event begins ;-) > Also use it in iommu_assign_dt_device even though the current IOMMU > implementation on ARM shares P2M with the processor. > --- > xen/drivers/passthrough/arm/iommu.c | 6 ++++++ > xen/drivers/passthrough/device_tree.c | 7 +++++++ > xen/drivers/passthrough/iommu.c | 25 +++++++++++++++++++++++++ > xen/drivers/passthrough/pci.c | 12 ++++-------- > xen/include/xen/iommu.h | 2 ++ > 5 files changed, 44 insertions(+), 8 deletions(-) > > diff --git a/xen/drivers/passthrough/arm/iommu.c b/xen/drivers/passthrough/arm/iommu.c > index 3007b99..de4ed64 100644 > --- a/xen/drivers/passthrough/arm/iommu.c > +++ b/xen/drivers/passthrough/arm/iommu.c > @@ -68,3 +68,9 @@ void arch_iommu_domain_destroy(struct domain *d) > { > iommu_dt_domain_destroy(d); > } > + > +int arch_iommu_populate_page_table(struct domain *d) > +{ > + /* The IOMMU share the p2m with the CPU */ "shares" > + return -ENOSYS; > +} > diff --git a/xen/drivers/passthrough/device_tree.c b/xen/drivers/passthrough/device_tree.c > index 3e47df5..afb4dfc 100644 > --- a/xen/drivers/passthrough/device_tree.c > +++ b/xen/drivers/passthrough/device_tree.c > @@ -41,6 +41,13 @@ int iommu_assign_dt_device(struct domain *d, struct dt_device_node *dev) > if ( !list_empty(&dev->domain_list) ) > goto fail; > > + if ( need_iommu(d) <= 0 ) > + { > + rc = iommu_buildup(d); > + if ( rc ) > + goto fail; > + } > + > rc = hd->platform_ops->assign_dt_device(d, dev); > > if ( rc ) > diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c > index cc12735..2e9b48d 100644 > --- a/xen/drivers/passthrough/iommu.c > +++ b/xen/drivers/passthrough/iommu.c > @@ -187,6 +187,31 @@ void iommu_teardown(struct domain *d) > tasklet_schedule(&iommu_pt_cleanup_tasklet); > } > > +int iommu_buildup(struct domain *d) Is there really not such a function already? How does x86 setup the iommu then? Ian.
On 07/03/2014 12:45 PM, Ian Campbell wrote: > On Mon, 2014-06-16 at 17:17 +0100, Julien Grall wrote: >> This new function will correctly initialize the IOMMU page table for the >> current domain. > > _setup, _configure, _initialise, _construct etc would be more normal > names I think. I will rename to iommu_construct. The function is used to construct the page table and set to 1 need_iommu(d). > "buildup" is the half hour of mindless blather from pundits that you > have to watch before a televised sporting event begins ;-) > >> Also use it in iommu_assign_dt_device even though the current IOMMU >> implementation on ARM shares P2M with the processor. >> --- >> xen/drivers/passthrough/arm/iommu.c | 6 ++++++ >> xen/drivers/passthrough/device_tree.c | 7 +++++++ >> xen/drivers/passthrough/iommu.c | 25 +++++++++++++++++++++++++ >> xen/drivers/passthrough/pci.c | 12 ++++-------- >> xen/include/xen/iommu.h | 2 ++ >> 5 files changed, 44 insertions(+), 8 deletions(-) >> >> diff --git a/xen/drivers/passthrough/arm/iommu.c b/xen/drivers/passthrough/arm/iommu.c >> index 3007b99..de4ed64 100644 >> --- a/xen/drivers/passthrough/arm/iommu.c >> +++ b/xen/drivers/passthrough/arm/iommu.c >> @@ -68,3 +68,9 @@ void arch_iommu_domain_destroy(struct domain *d) >> { >> iommu_dt_domain_destroy(d); >> } >> + >> +int arch_iommu_populate_page_table(struct domain *d) >> +{ >> + /* The IOMMU share the p2m with the CPU */ > > "shares" Ok. >> + return -ENOSYS; >> +} [..] >> +int iommu_buildup(struct domain *d) > > Is there really not such a function already? How does x86 setup the > iommu then? There is a function to initialize the IOMMU but the activation and the setup of page table are down later, I guess to avoid using memory for nothing. Regards,
diff --git a/xen/drivers/passthrough/arm/iommu.c b/xen/drivers/passthrough/arm/iommu.c index 3007b99..de4ed64 100644 --- a/xen/drivers/passthrough/arm/iommu.c +++ b/xen/drivers/passthrough/arm/iommu.c @@ -68,3 +68,9 @@ void arch_iommu_domain_destroy(struct domain *d) { iommu_dt_domain_destroy(d); } + +int arch_iommu_populate_page_table(struct domain *d) +{ + /* The IOMMU share the p2m with the CPU */ + return -ENOSYS; +} diff --git a/xen/drivers/passthrough/device_tree.c b/xen/drivers/passthrough/device_tree.c index 3e47df5..afb4dfc 100644 --- a/xen/drivers/passthrough/device_tree.c +++ b/xen/drivers/passthrough/device_tree.c @@ -41,6 +41,13 @@ int iommu_assign_dt_device(struct domain *d, struct dt_device_node *dev) if ( !list_empty(&dev->domain_list) ) goto fail; + if ( need_iommu(d) <= 0 ) + { + rc = iommu_buildup(d); + if ( rc ) + goto fail; + } + rc = hd->platform_ops->assign_dt_device(d, dev); if ( rc ) diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c index cc12735..2e9b48d 100644 --- a/xen/drivers/passthrough/iommu.c +++ b/xen/drivers/passthrough/iommu.c @@ -187,6 +187,31 @@ void iommu_teardown(struct domain *d) tasklet_schedule(&iommu_pt_cleanup_tasklet); } +int iommu_buildup(struct domain *d) +{ + int rc = 0; + + /* + * The caller should check we effectively need to set up the IOMMMU + * for this domain. + */ + ASSERT(need_iommu(d) <= 0); + + if ( need_iommu(d) > 0 ) + return 0; + + if ( !iommu_use_hap_pt(d) ) + { + rc = arch_iommu_populate_page_table(d); + if ( rc ) + return rc; + } + + d->need_iommu = 1; + + return rc; +} + void iommu_domain_destroy(struct domain *d) { struct hvm_iommu *hd = domain_hvm_iommu(d); diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c index 1eba833..e31dcfb 100644 --- a/xen/drivers/passthrough/pci.c +++ b/xen/drivers/passthrough/pci.c @@ -1342,14 +1342,10 @@ static int assign_device(struct domain *d, u16 seg, u8 bus, u8 devfn) if ( need_iommu(d) <= 0 ) { - if ( !iommu_use_hap_pt(d) ) - { - rc = arch_iommu_populate_page_table(d); - if ( rc ) - { - spin_unlock(&pcidevs_lock); - return rc; - } + rc = iommu_buildup(d); + if ( rc ) { + spin_unlock(&pcidevs_lock); + return rc; } d->need_iommu = 1; } diff --git a/xen/include/xen/iommu.h b/xen/include/xen/iommu.h index 8eb764a..9b2af51 100644 --- a/xen/include/xen/iommu.h +++ b/xen/include/xen/iommu.h @@ -64,6 +64,8 @@ int arch_iommu_domain_init(struct domain *d); int arch_iommu_populate_page_table(struct domain *d); void arch_iommu_check_autotranslated_hwdom(struct domain *d); +int iommu_buildup(struct domain *d); + /* Function used internally, use iommu_domain_destroy */ void iommu_teardown(struct domain *d);