Replace the #include of <linux/mod_devicetable.h> by the more specific
<linux/device-id/*.h> where applicable. For most cases the include
can be dropped completely, only a few drivers need one or two headers
added.

Acked-by: Danilo Krummrich <dakr@kernel.org>
Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/1a3f2007c5c5dcf555c09a4035ce3ae8ef1b6c49.1782808461.git.u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>

The RSI interface can return RSI_INCOMPLETE when a report spans
multiple granules. This is an expected condition and should not be
treated as a fatal error.

Currently, arm_cca_report_new() checks for `info.result != RSI_SUCCESS`
and bails out, which incorrectly flags RSI_INCOMPLETE as a failure.
Fix the check to only break out on results other than RSI_SUCCESS or
RSI_INCOMPLETE.

This ensures partial reports are handled correctly and avoids spurious
-ENXIO errors when generating attestation reports.

Fixes: 7999edc484ca ("virt: arm-cca-guest: TSM_REPORT support for realms")
Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Reported-by: Jagdish Gediya <Jagdish.Gediya@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Yeoreum Yun <yeoreum.yun@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

In preparation for new + common TSM (TEE Security Manager)
infrastructure, namespace the TSM report symbols in tsm.h with an
_REPORT suffix to differentiate them from other incoming tsm work.

Cc: Yilun Xu <yilun.xu@intel.com>
Cc: Samuel Ortiz <sameo@rivosinc.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Cc: Steven Price <steven.price@arm.com>
Reviewed-by: Alexey Kardashevskiy <aik@amd.com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://patch.msgid.link/174107246021.1288555.7203769833791489618.stgit@dwillia2-xfh.jf.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

The TSM module provides guest identification and attestation when a
guest runs in CCA realm mode. By creating a dummy platform device,
let's ensure the module is automatically loaded. The udev daemon loads
the TSM module after it receives a device addition event. Once that
happens, it can be used earlier in the boot process to decrypt the
rootfs.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20241220181236.172060-2-jeremy.linton@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

As per the guidelines, new drivers may not be set to default on.
An expert user can always select it.

Reported-by: Dan Williams <dan.j.williams@intel.com>
Cc: Will Deacon <will@kernel.org>
Cc: Steven Price <steven.price@arm.com>
Cc: Sami Mujawar <sami.mujawar@arm.com>
Link: https://lore.kernel.org/r/6750c695194cd_2508129427@dwillia2-xfh.jf.intel.com.notmuch
Link: https://lore.kernel.org/r/20241205143634.306114-1-suzuki.poulose@arm.com
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

Introduce an arm-cca-guest driver that registers with
the configfs-tsm module to provide user interfaces for
retrieving an attestation token.

When a new report is requested the arm-cca-guest driver
invokes the appropriate RSI interfaces to query an
attestation token.

The steps to retrieve an attestation token are as follows:
  1. Mount the configfs filesystem if not already mounted
     mount -t configfs none /sys/kernel/config
  2. Generate an attestation token
     report=/sys/kernel/config/tsm/report/report0
     mkdir $report
     dd if=/dev/urandom bs=64 count=1 > $report/inblob
     hexdump -C $report/outblob
     rmdir $report

Signed-off-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Link: https://lore.kernel.org/r/20241017131434.40935-11-steven.price@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>