On MTL, if the GSC Proxy init flows haven't completed, submissions to the
GSC engine will fail. Those init flows are dependent on the mei's
gsc_proxy component that is loaded in parallel with i915 and a
worker that could potentially start after i915 driver init is done.
That said, all subsytems that access the GSC engine today does check
for such init flow completion before using the GSC engine. However,
selftests currently don't wait on anything before starting.
To fix this, add a waiter function at the start of __run_selftests
that waits for gsc-proxy init flows to complete. Selftests shouldn't
care if the proxy-init failed as that should be flagged elsewhere.
Difference from prior versions:
v7: - Change the fw status to INTEL_UC_FIRMWARE_LOAD_FAIL if the
proxy-init fails so that intel_gsc_uc_fw_proxy_get_status
catches it. (Daniele)
v6: - Add a helper that returns something more than a boolean
so we selftest can stop waiting if proxy-init hadn't
completed but failed (Daniele).
v5: - Move the call to __wait_gsc_proxy_completed from common
__run_selftests dispatcher to the group-level selftest
function (Trvtko).
- change the pr_info to pr_warn if we hit the timeout.
v4: - Remove generalized waiters function table framework (Tvrtko).
- Remove mention of CI-framework-timeout from comments (Tvrtko).
v3: - Rebase to latest drm-tip.
v2: - Based on internal testing, increase the timeout for gsc-proxy
specific case to 8 seconds.
Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230720230126.375566-1-alan.previn.teres.alexis@intel.com
intel_gsc_uc_fw_proxy_init_done is used by a few code paths
and usages. However, certain paths need a wakeref while others
can't take a wakeref such as from the runtime_pm_resume callstack.
Add a param into this helper to allow callers to direct whether
to take the wakeref or not. This resolves the following bug:
INFO: task sh:2607 blocked for more than 61 seconds.
Not tainted 6.3.0-pxp-gsc-final-jun14+ #297
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:sh state:D stack:13016 pid:2607 ppid:2602 flags:0x00004000
Call Trace:
<TASK>
__schedule+0x47b/0xe10
schedule+0x58/0xd0
rpm_resume+0x1cc/0x800
? __pfx_autoremove_wake_function+0x10/0x10
__pm_runtime_resume+0x42/0x80
__intel_runtime_pm_get+0x19/0x80 [i915]
gsc_uc_get_fw_status+0x10/0x50 [i915]
intel_gsc_uc_fw_init_done+0x9/0x20 [i915]
intel_gsc_uc_load_start+0x5b/0x130 [i915]
__uc_resume+0xa5/0x280 [i915]
intel_runtime_resume+0xd4/0x250 [i915]
? __pfx_pci_pm_runtime_resume+0x10/0x10
__rpm_callback+0x3c/0x160
Fixes: 8c33c3755b ("drm/i915/gsc: take a wakeref for the proxy-init-completion check")
Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230615211940.4061378-1-alan.previn.teres.alexis@intel.com
The release and security versions of the GSC binary are not used at
runtime to decide interface compatibility (there is a separate version
for that), but they're still useful for debug, so it is still worth
extracting them and printing them out in dmesg.
To get to these version, we need to navigate through various headers in
the binary. See in-code comment for details.
v2: fix and improve size checks when crawling the binary header, add
comment about the different version, wrap the partition base/offset
pairs in the GSC header in a struct (Alan)
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230612181529.2222451-3-daniele.ceraolospurio@intel.com
A few fixes/updates are required around the GSC memory allocation and it
is easier to do them all at the same time. The changes are as follows:
1 - Switch the memory allocation to stolen memory. We need to avoid
accesses from GSC FW to normal memory after the suspend function has
completed and to do so we can either switch to using stolen or make sure
the GSC is gone to sleep before the end of the suspend function. Given
that the GSC waits for a bit before going idle even if there are no
pending operations, it is easier and quicker to just use stolen memory.
2 - Reduce the GSC allocation size to 4MBs, which is the POR requirement.
The 8MBs were needed only for early FW and I had misunderstood that as
being the expected POR size when I sent the original patch.
3 - Perma-map the GSC allocation. This isn't required immediately, but it
will be needed later to be able to quickly extract the GSC logs, which are
inside the allocation. Since the mapping code needs to be rewritten due to
switching to stolen, it makes sense to do the switch immediately to avoid
having to change it again later.
Note that the explicit setting of CACHE_NONE for Wa_22016122933 has been
dropped because that's the default setting for stolen memory on !LLC
platforms.
v2: only memset the memory we're not overwriting (Alan)
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230612181529.2222451-2-daniele.ceraolospurio@intel.com
The GSC uC needs to communicate with the CSME to perform certain
operations. Since the GSC can't perform this communication directly
on platforms where it is integrated in GT, i915 needs to transfer the
messages from GSC to CSME and back.
The proxy flow is as follow:
1 - i915 submits a request to GSC asking for the message to CSME
2 - GSC replies with the proxy header + payload for CSME
3 - i915 sends the reply from GSC as-is to CSME via the mei proxy
component
4 - CSME replies with the proxy header + payload for GSC
5 - i915 submits a request to GSC with the reply from CSME
6 - GSC replies either with a new header + payload (same as step 2,
so we restart from there) or with an end message.
After GSC load, i915 is expected to start the first proxy message chain,
while all subsequent ones will be triggered by the GSC via interrupt.
To communicate with the CSME, we use a dedicated mei component, which
means that we need to wait for it to bind before we can initialize the
proxies. This usually happens quite fast, but given that there is a
chance that we'll have to wait a few seconds the GSC work has been moved
to a dedicated WQ to not stall other processes.
v2: fix code style, includes and variable naming (Alan)
v3: add extra check for proxy status, fix includes and comments
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Alan Previn <alan.previn.teres.alexis@intel.com>
Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230502163854.317653-4-daniele.ceraolospurio@intel.com
This patch implements Wa_22016122933.
In MTL, memory writes initiated by the Media tile update the whole
cache line, even for partial writes. This creates a coherency
problem for cacheable memory if both CPU and GPU are writing data
to different locations within a single cache line.
This patch circumvents the issue by making CPU/GPU shared memory
uncacheable (WC on CPU side, and PAT index 2 for GPU). Additionally,
it ensures that CPU writes are visible to the GPU with an
intel_guc_write_barrier().
While fixing the CTB issue, we noticed some random GSC firmware
loading failure because the share buffers are cacheable (WB) on CPU
side but uncached on GPU side. To fix these issues we need to map
such shared buffers as WC on CPU side. Since such allocations are
not all done through GuC allocator, to avoid too many code changes,
the i915_coherent_map_type() is now hard coded to return WC for MTL.
v2: Simplify the commit message(Matt).
BSpec: 45101
Signed-off-by: Fei Yang <fei.yang@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Acked-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230424182902.3663500-3-fei.yang@intel.com
If the GSC was loaded, the only way to stop it during the driver unload
flow is to do a driver-FLR.
The driver-initiated FLR is not the same as PCI config space FLR in
that it doesn't reset the SGUnit and doesn't modify the PCI config
space. Thus, it doesn't require a re-enumeration of the PCI BARs.
However, the driver-FLR does cause a memory wipe of graphics memory
on all discrete GPU platforms or a wipe limited to stolen memory
on the integrated GPU platforms.
We perform the FLR as the last action before releasing the MMIO bar, so
that we don't have to care about the consequences of the reset on the
unload flow.
v2: rename FLR function, add comment to explain FLR impact (Rodrigo),
better explain why GSC needs FLR (Alan)
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Alan Previn <alan.previn.teres.alexis@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221208200521.2928378-5-daniele.ceraolospurio@intel.com
