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Subject[PATCH 3/3] drm/i915: Always allocate VCPI during system resume
Date
Since there's a chance MST topologies can be removed while the system is
in suspend, there's also a chance that the connectors in the atomic
state which we try to restore on system resume will have been
unregistered if they were part of an MST topology that was removed
mid-suspend. In such situations, we'll currently skip recalculating the
VCPI. Normally this would be safe since we don't expect to be allowed to
enable displays on unregistered connections, but since we need to try
our best to restore even partially invalid atomic states on system
resume we end up introducing the chance that we try enabling a display
on a now-unregistered connector. This of course results on a blow up
during system resume:

[ 1894.177788] [drm:pipe_config_err [i915]] *ERROR* mismatch in dp_m_n (expected tu 0 gmch 1730150/8388608 link 288358/1048576, or tu 0 gmch 0/0 link 0/0, found tu 64, gmch 1730150/8388608 link 288358/1048576)
[ 1894.177795] ------------[ cut here ]------------
[ 1894.177799] pipe state doesn't match!
[ 1894.177905] WARNING: CPU: 2 PID: 1894 at drivers/gpu/drm/i915/intel_display.c:12292 intel_atomic_commit_tail+0xd5e/0xdd0 [i915]
[ 1894.177909] Modules linked in: i915(O) drm_kms_helper(O) drm(O) vfat fat joydev iTCO_wdt wmi_bmof btusb btrtl btbcm intel_rapl btintel i2c_algo_bit x86_pkg_temp_thermal bluetooth syscopyarea coretemp sysfillrect sysimgblt crc32_pclmul fb_sys_fops ucsi_acpi psmouse ecdh_generic pcspkr typec_ucsi i2c_i801 typec mei_me mei i2c_core wmi thinkpad_acpi ledtrig_audio snd soundcore rfkill tpm_tis tpm_tis_core video pcc_cpufreq tpm acpi_pad uas usb_storage crc32c_intel nvme serio_raw nvme_core xhci_pci xhci_hcd [last unloaded: drm]
[ 1894.177990] CPU: 2 PID: 1894 Comm: kworker/u16:8 Tainted: G O 5.0.0-rc4Lyude-Test+ #9
[ 1894.177994] Hardware name: LENOVO 20L8S2N800/20L8S2N800, BIOS N22ET35W (1.12 ) 04/09/2018
[ 1894.178005] Workqueue: events_unbound async_run_entry_fn
[ 1894.178079] RIP: 0010:intel_atomic_commit_tail+0xd5e/0xdd0 [i915]
[ 1894.178085] Code: ba 01 00 00 00 4c 89 4c 24 10 e8 3d 46 01 00 4c 8b 4c 24 10 e9 a4 fb ff ff e8 b2 18 bd e0 0f 0b e9 a5 fd ff ff e8 a6 18 bd e0 <0f> 0b e9 f1 f9 ff ff e8 9a 18 bd e0 0f 0b 0f b6 44 24 18 e9 23 f9
[ 1894.178090] RSP: 0000:ffffc90000553c08 EFLAGS: 00010286
[ 1894.178096] RAX: 0000000000000000 RBX: ffff888459edc000 RCX: 0000000000000006
[ 1894.178101] RDX: 0000000000000007 RSI: ffff8884591e2f90 RDI: ffff88845e295690
[ 1894.178105] RBP: ffff888454e27000 R08: 0000000000000000 R09: 0000000000000000
[ 1894.178108] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888454e22000
[ 1894.178112] R13: ffff888454e21000 R14: ffff8883ca680750 R15: ffff8883ca680758
[ 1894.178118] FS: 0000000000000000(0000) GS:ffff88845e280000(0000) knlGS:0000000000000000
[ 1894.178123] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 1894.178127] CR2: 0000000000000000 CR3: 0000000002214001 CR4: 00000000003606e0
[ 1894.178131] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 1894.178135] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 1894.178139] Call Trace:
[ 1894.178224] intel_atomic_commit+0x240/0x320 [i915]
[ 1894.178251] drm_atomic_helper_commit_duplicated_state+0xc9/0xe0 [drm_kms_helper]
[ 1894.178321] __intel_display_resume+0x82/0xd0 [i915]
[ 1894.178391] intel_display_resume+0xcf/0x120 [i915]
[ 1894.178453] i915_drm_resume+0xb1/0x100 [i915]
[ 1894.178465] ? pci_pm_suspend_late+0x30/0x30
[ 1894.178473] dpm_run_callback+0x70/0x210
[ 1894.178484] device_resume+0xae/0x1f0
[ 1894.178493] async_resume+0x19/0x30
[ 1894.178502] async_run_entry_fn+0x39/0x160
[ 1894.178513] process_one_work+0x23c/0x590
[ 1894.178529] worker_thread+0x30/0x380
[ 1894.178539] ? rescuer_thread+0x340/0x340
[ 1894.178545] kthread+0x112/0x130
[ 1894.178552] ? kthread_create_on_node+0x60/0x60
[ 1894.178563] ret_from_fork+0x3a/0x50
[ 1894.178582] irq event stamp: 76782
[ 1894.178591] hardirqs last enabled at (76781): [<ffffffff8112c135>] vprintk_emit+0x2c5/0x2d0
[ 1894.178600] hardirqs last disabled at (76782): [<ffffffff81001ae8>] trace_hardirqs_off_thunk+0x1a/0x1c
[ 1894.178609] softirqs last enabled at (76734): [<ffffffff81c0035d>] __do_softirq+0x35d/0x412
[ 1894.178618] softirqs last disabled at (76727): [<ffffffff810bf830>] irq_exit+0xe0/0xf0
[ 1894.178687] WARNING: CPU: 2 PID: 1894 at drivers/gpu/drm/i915/intel_display.c:12292 intel_atomic_commit_tail+0xd5e/0xdd0 [i915]
[ 1894.178692] ---[ end trace 0df08c0b9a67376e ]---

So, fix this by using the new drm_atomic_state.suspend_or_resume hook in
order to force us to retrieve a VCPI allocation when restoring a pipe's
atomic state. This is safe, since drm_dp_atomic_find_vcpi_slots() will
just return the VCPI allocation we had pre-suspend.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Cc: Daniel Vetter <daniel@ffwll.ch>
Fixes: eceae1472467 ("drm/dp_mst: Start tracking per-port VCPI allocations")
---
drivers/gpu/drm/i915/intel_dp_mst.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index cdb83d294cdd..04c9a16fdc39 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -80,8 +80,13 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, bpp);
pipe_config->pbn = mst_pbn;

- /* Zombie connectors can't have VCPI slots */
- if (!drm_connector_is_unregistered(connector)) {
+ /*
+ * Zombie connectors can't have VCPI slots and won't be turned on,
+ * except during resume where we must make sure we restore the
+ * previous VCPI allocations
+ */
+ if (!drm_connector_is_unregistered(connector) ||
+ state->suspend_or_resume) {
slots = drm_dp_atomic_find_vcpi_slots(state,
&intel_dp->mst_mgr,
port,
--
2.20.1
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