linux-kernel - [PATCH 5.8 221/232] drm/i915/gt: Force the GT reset on shutdown

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200820091623.485949565@linuxfoundation.org>
Date:   Thu, 20 Aug 2020 11:21:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chris Wilson <chris@...is-wilson.co.uk>,
        stable@...nel.org, Mika Kuoppala <mika.kuoppala@...ux.intel.com>
Subject: [PATCH 5.8 221/232] drm/i915/gt: Force the GT reset on shutdown

From: Chris Wilson <chris@...is-wilson.co.uk>

commit 7c4541a37bbbf83c0f16f779e85eb61d9348ed29 upstream.

Before we return control to the system, and letting it reuse all the
pages being accessed by HW, we must disable the HW. At the moment, we
dare not reset the GPU if it will clobber the display, but once we know
the display has been disabled, we can proceed with the reset as we
shutdown the module. We know the next user must reinitialise the HW for
their purpose.

Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/489
Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: stable@...nel.org
Reviewed-by: Mika Kuoppala <mika.kuoppala@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200525151459.12083-1-chris@chris-wilson.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/gt/intel_gt.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -616,6 +616,11 @@ void intel_gt_driver_unregister(struct i
 void intel_gt_driver_release(struct intel_gt *gt)
 {
 	struct i915_address_space *vm;
+	intel_wakeref_t wakeref;
+
+	/* Scrub all HW state upon release */
+	with_intel_runtime_pm(gt->uncore->rpm, wakeref)
+		__intel_gt_reset(gt, ALL_ENGINES);
 
 	vm = fetch_and_zero(&gt->vm);
 	if (vm) /* FIXME being called twice on error paths :( */