Impact: cleanup, reduce kernel size a bit, avoid sparse warning

Fixes sparse warning:
arch/x86/kernel/amd_iommu.c:1299:6: warning: symbol 'prealloc_protection_domains' was not declared. Should it be static?
Signed-off-by: NJaswinder Singh Rajput <jaswinderrajput@gmail.com>
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see total number of map requests in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see amount of allocated io memory in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of domain tlb flushes in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of single iommu domain tlb flushes in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of requests for more than one page in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of free_coherent requests in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of alloc_coherent requests in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of unmap_sg requests in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of map_sg requests in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of unmap_single requests in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of map_single requests in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: see number of completion wait events in debugfs
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: create a new debugfs directory
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add defines to make iommu stats collection configurable
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: adds new Kconfig entry
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: cleanup
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: cleanup
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: cleanup
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: use bool instead of int for iommu->need_sync
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: use generic dev_name instead of own function
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: also hotplug devices benefit from device isolation
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: adds a new protection domain flag
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add a generic function to lockup addresses in protection domains
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add a generic function to unmap pages into protection domains
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add a generic function to map pages into protection domains
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add a generic function to attach devices to protection domains
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add a generic function to detach devices from protection domains
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add a generic function for releasing protection domains
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add a generic function for allocation protection domains
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add a function to remove all devices from a domain
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: inform IOMMU about state change of a device in the driver core
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add helper functions to detach a device from a domain
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: rename set_device_domain() to attach_device()
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: know how many devices are assigned to a domain
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: detect when a driver uses a device assigned otherwise
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Imapct: add a new struct member to 'struct protection_domain'

When using protection domains for dma_ops and KVM its better to know for
which subsystem it was allocated. Add a flags member to struct
protection domain for that purpose.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: add a function to flush a domain id on every IOMMU
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>

Impact: save unneeded logic to add and remove domains to the list

The removal of a protection domain from the iommu_pd_list is not
necessary. Another benefit is that we save complexity because we don't
have to readd it later when the device no longer uses the domain.
Signed-off-by: NJoerg Roedel <joerg.roedel@amd.com>