Add routines to:

* Alloc remapping tables and single entries from these
  tables
* Change entries in the tables
* Free entries in the table
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Add routine to invalidate the IOMMU cache for interupt
translations. Also include the IRTE caches when flushing all
IOMMU caches.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

The IVRS table usually includes the IOMMU device. But the
IOMMU does never translate itself, so make sure the IOMMU
driver knows this.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

When the IOMMU is enabled very early (as with irq-remapping)
some devices are still in BIOS hand. When dma is blocked
early this can cause lots of IO_PAGE_FAULTs. So delay the
DMA initialization and do it right before the dma_ops are
initialized.
To be secure, block all interrupts by default when irq-remapping is
enabled in the system. They will be reenabled on demand
later. Without blocking interrupts by default devices can
issue arbitrary interrupts by sending special DMA packets to
the CPU that look like MSI messages. This is especially
dangerous when a device is assigned to a KVM guest because
the guest can then DoS the host.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

When the IOAPIC information provided in the IVRS table is
not correct or not complete the system may not boot at all
when interrupt remapping is enabled. So check if this
information is correct and print out a firmware bug message
when it is not.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

To easily map device ids to interrupt remapping table
entries a new lookup table is necessary.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

The irq remapping tables for the AMD IOMMU need to be
aligned on a 128 byte boundary. Create a seperate slab-cache
to guarantee this alignment.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

The IVRS ACPI table provides information about the IOAPICs
and the HPETs available in the system and which PCI device
ID they use in transactions. Save that information for later
usage in interrupt remapping.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>
Reviewed-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>

The check in the for-loop is broken. Fix it and the
boot-crash it causes in AMD IOMMUv2 systems.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

The ACPI tables in the Macbook Air 5,1 define a single IOAPIC with id 2,
but the only remapping unit described in the DMAR table matches id 0.
Interrupt remapping fails as a result, and the kernel panics with the
message "timer doesn't work through Interrupt-remapped IO-APIC."

To fix this, check each IOAPIC for a corresponding IOMMU. If an IOMMU is
not found, do not allow IRQ remapping to be enabled.

v2: Move check to parse_ioapics_under_ir(), raise log level to KERN_ERR,
    and add FW_BUG to the log message
v3: Skip check if IOMMU doesn't support interrupt remapping and remove
    existing check that the IOMMU count equals the IOAPIC count
Acked-by: NSuresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: NSeth Forshee <seth.forshee@canonical.com>
Acked-by: NYinghai Lu <yinghai@kernel.org>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

SR-IOV can create buses without a bridge.  There may be other cases
where this happens as well.  In these cases skip to the parent bus
and continue testing devices there.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

SR-IOV can create buses without a bridge.  There may be other cases
where this happens as well.  In these cases skip to the parent bus
and continue testing devices there.
Signed-off-by: NAlex Williamson <alex.williamson@redhat.com>
Tested-by: NDavid Ahern <dsahern@gmail.com>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

The pci_request_acs() function needs to be called before PCI
probing to be effective. So move it to another call-place to
ensure that.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Fixes the following build error introduced by commit 3177bb76
("iommu/exynos: Implement DOMAIN_ATTR_GEOMETRY attribute"):

drivers/iommu/exynos-iommu.c: In function ‘exynos_iommu_domain_init’:
drivers/iommu/exynos-iommu.c:735:2: error: ‘dom’ undeclared
(first use in this function)
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Acked-by: NKukjin Kim <kgene.kim@samsung.com>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

err initial value should be -EAGAIN. Otherwise 2nd iteration always
fails in the case as[0] is occupied.
Signed-off-by: NHiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Small clean up with lesser nest for readability.
Signed-off-by: NHiroshi Doyu <hdoyu@nvidia.com>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Add missing free_domain_mem on failure path after alloc_domain.

A simplified version of the semantic match that finds this
problem is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@km exists@
local idexpression e;
expression e1,e2,e3;
type T,T1;
identifier f;
@@

* e = alloc_domain(...)
... when any
    when != e = e1
    when != e1 = (T)e
    when != e1(...,(T)e,...)
    when != &e->f
if(...) { ... when != e2(...,(T1)e,...)
                 when != e3 = e
                 when forall
(
             return <+...e...+>;
|
*             return ...;
) }
// </smpl>
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

If list_for_each_entry, etc complete a traversal of the
list, the iterator variable ends up pointing to an address
at an offset from the list head, and not a meaningful
structure.  Thus this value should not be used after the end
of the iterator.  Replace c->dev by dev, which is the value
that c->dev has been compared to.

This problem was found using Coccinelle (http://coccinelle.lip6.fr/).
Signed-off-by: NJulia Lawall <Julia.Lawall@lip6.fr>
Acked-by: NStephen Warren <swarren@wwwdotorg.org>
Acked-by: NHiroshi DOYU <hdoyu@nvidia.com>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Correct spelling typo in debug messages and comments
in drivers/iommu.
Signed-off-by: NMasanari Iida <standby24x7@gmail.com>
Signed-off-by: NJiri Kosina <jkosina@suse.cz>

This did not work because devices are not put into the
pt_domain. Fix this.

Cc: stable@vger.kernel.org
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Add missing spin_lock initialization in
amd_iommu_bind_pasid() function and make lockdep happy
again.

Cc: stable@vger.kernel.org # >= v3.3
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

This step makes it very easy to keep track about the current
intialization state of the iommu driver. With this change we
can initialize the IOMMU hardware to a point where it can
remap interrupts and later resume the initializion to enable
dma remapping.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

This function will initialize everthing necessary so that
devices can do DMA. This includes dma_ops and iommu_ops.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

The message belongs there anyway, so move it to that
function.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Split the enable_iommus() routine so that a part of it can
run in early code.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Split out the code to parse the ACPI table and setup
relevant data structures into a new function.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

This function will be called before the PCI subsystem is
initialized. Therefore dev_name doen't work and IOMMU
information can't be printed to the klog as before. Move the
code to print that information to a later point where PCI
initializtion has already happened.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

For interrupt remapping the relevant IOMMU initialization
needs to run earlier at boot when the PCI subsystem is not
yet initialized. To support that this patch splits the parts
of IOMMU initialization which need PCI accesses out of the
initial setup path so that this can be done later.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

This makes it easier to propagate errors while parsing the
IVRS table and makes the amd_iommu_init_err hack obsolete.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

A few sparse warnings fire in drivers/iommu/amd_iommu_init.c.
Fix most of them with this patch. Also fix the sparse
warnings in drivers/iommu/irq_remapping.c while at it.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Instead of taking as->lock before calling alloc_pdir() and
releasing it in that function to allocate memory, just take
the lock only in the alloc_pdir function and run the loop
without any lock held. This simplifies the complicated
lock->unlock->alloc->lock->unlock sequence into
alloc->lock->unlock.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

alloc_pdir() is called from smmu_iommu_domain_init() with spin_lock
held. memory allocations in alloc_pdir() had to be atomic. Instead of
converting into atomic allocation, this patch once releases a lock,
does the allocation, holds the lock again and then sees if it's raced
or not in order to avoid introducing mutex and preallocation.
Signed-off-by: NHiroshi DOYU <hdoyu@nvidia.com>
Reported-by: NChris Wright <chrisw@sous-sol.org>
Cc: Chris Wright <chrisw@sous-sol.org>
Acked-by: NStephen Warren <swarren@wwwdotorg.org>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

alloc_pdir() is called with smmu->as[?].pdir_page == NULL. No need to
check pdir_page again inside alloc_pdir().
Signed-off-by: NHiroshi DOYU <hdoyu@nvidia.com>
Acked-by: NStephen Warren <swarren@wwwdotorg.org>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Implement the attribute for the Samsung Exynos IOMMU driver.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Implement the attribute for the Tegra IOMMU drivers.
Signed-off-by: NHiroshi DOYU <hdoyu@nvidia.com>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Implement the attribute for the MSM IOMMU driver.
Acked-by: NDavid Brown <davidb@codeaurora.org>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Implement the attribute for the OMAP IOMMU driver.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Implement the attribute for the Intel IOMMU driver.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Implement the attribute itself and add the code for the
AMD IOMMU driver.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

This patch introduces an extension to the iommu-api to get
and set attributes for an iommu_domain. Two functions are
introduced for this:

	* iommu_domain_get_attr()
	* iommu_domain_set_attr()

These functions will be used to make the iommu-api suitable
for GART-like IOMMUs and to implement hardware-specifc
api-extensions.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>