On Tue, Jan 19, 2021 at 10:49 PM Fabio Estevam <festevam@xxxxxxxxx> wrote: > > Hi Daniel, > > On Tue, Jan 19, 2021 at 3:01 PM Daniel Vetter <daniel@xxxxxxxx> wrote: > > > Don't we need the same treatment for suspend/resume too? Also if you > > Yes, you are right. I have just tested suspend/resume and the problem > is there too: > > [ 69.708552] 8<--- cut here --- > [ 69.711970] Unable to handle kernel NULL pointer dereference at > virtual address 00000000 > [ 69.720240] pgd = (ptrval) > [ 69.723000] [00000000] *pgd=ca217831 > [ 69.726664] Internal error: Oops: 17 [#1] SMP ARM > [ 69.731387] Modules linked in: > [ 69.734463] CPU: 0 PID: 167 Comm: sh Not tainted > 5.11.0-rc3-next-20210118-dirty #383 > [ 69.742223] Hardware name: Freescale i.MX53 (Device Tree Support) > [ 69.748326] PC is at msm_atomic_commit_tail+0x50/0xb90 > [ 69.753505] LR is at commit_tail+0x9c/0x18c > [ 69.757705] pc : [<c07755f0>] lr : [<c06e7218>] psr: 60000013 > [ 69.763982] sp : c28bfcd8 ip : fffffffa fp : c24c20a0 > [ 69.769217] r10: c0f82720 r9 : 00000010 r8 : 3a62b298 > [ 69.774452] r7 : c23a3000 r6 : c2816c00 r5 : 00000000 r4 : 00000000 > [ 69.780990] r3 : c24c2c00 r2 : 00000000 r1 : 00000000 r0 : 00000000 > [ 69.787529] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none > [ 69.794679] Control: 10c5387d Table: 72870019 DAC: 00000051 > [ 69.800434] Process sh (pid: 167, stack limit = 0x(ptrval)) > [ 69.806019] Stack: (0xc28bfcd8 to 0xc28c0000) > [ 69.810391] fcc0: > ffffffff 20bfa1e1 > [ 69.818584] fce0: 00000010 00000000 8a7c54c5 00000000 00000000 > c2816c00 00000000 c23a3000 > [ 69.826778] fd00: 00000000 3a62b298 00000010 c0f82720 c24c20a0 > c06e7218 00000000 c2816c00 > [ 69.834972] fd20: c23a3000 00000000 c2816c2c c16093d4 c17682f0 > c0e2920c 00000000 00000000 > [ 69.843166] fd40: 00000000 c12ca028 c23a3000 c23a3494 c2816c00 > c23a349c c24c2010 c06e74d4 > [ 69.851359] fd60: 00000000 c23a3000 c2816480 c07050ec c24c2010 > c0e2943c c1609798 c296a880 > [ 69.859552] fd80: 00000009 00000001 00000000 00000000 c175f454 > 00000000 c175f458 c1c669cc > [ 69.867745] fda0: 00000000 c12c9acc 00000000 00000001 00000009 > 00000000 c23a32e4 c23a32e4 > [ 69.875938] fdc0: 00000000 c1609388 c28be000 c23a3000 c28be000 > c1765220 c17682f0 c06e84bc > [ 69.884132] fde0: c24c2138 c28be000 c1765220 c07e9f58 00000010 > c176833c 00000002 c0777850 > [ 69.892326] fe00: 00000000 c1e08a9c 00000002 00000010 396ed042 > 00000001 c1e08ac0 00000000 > [ 69.900519] fe20: 00000000 c07ea57c c296ae28 c0e33ba0 00000000 > c1e08a9c 00000003 c125a7c8 > [ 69.908714] fe40: c17fa154 c01954a8 c16093d4 00000001 c1e08ac0 > 00000000 00000000 c1609388 > [ 69.916907] fe60: c28bfe74 00000003 00000000 c125a7c8 c17fa154 > 00000001 c1e08ac0 00000000 > [ 69.925100] fe80: 00000000 c01963a4 00000003 c2a9f040 00000003 > 00000004 c1254a00 c01943b0 > [ 69.933294] fea0: 00000004 c2901f10 c2a9f040 c2901f00 00d220f0 > c28bff78 00000000 c0374f0c > [ 69.941488] fec0: 00000000 00000000 00d220f0 c29488c0 00000000 > 00000004 00d220f0 c28bff78 > [ 69.949681] fee0: c02c31c4 c0374e00 c2803000 c02c2bfc 00000001 > 00000000 c02c31c4 c2943bd0 > [ 69.957876] ff00: c02e7428 c17ee19c c296adc8 00000000 c2943bd0 > c0183a34 c2943bd0 c02e7428 > [ 69.966070] ff20: c28be000 c296a880 c1609798 c018ced8 c296adc8 > c0e33ba0 c17ee2de 60000013 > [ 69.974264] ff40: 00000000 00000001 00000000 c1609388 c17ee2de > c29488c0 c29488c0 00d220f0 > [ 69.982457] ff60: 00000004 00000000 00000000 00000004 00d20284 > c02c31c4 00000000 00000000 > [ 69.990651] ff80: c010019c c1609388 c1609798 00000001 00000000 > 000d7b54 00000004 c0100264 > [ 69.998844] ffa0: c28be000 c0100080 00000001 00000000 00000001 > 00d220f0 00000004 00000000 > [ 70.007039] ffc0: 00000001 00000000 000d7b54 00000004 00000004 > 00000020 00d20410 00d20284 > [ 70.015232] ffe0: 000d7258 be831960 0001b93c b6ee97a0 60000010 > 00000001 00000000 00000000 > [ 70.023427] [<c07755f0>] (msm_atomic_commit_tail) from [<c06e7218>] > (commit_tail+0x9c/0x18c) > [ 70.031890] [<c06e7218>] (commit_tail) from [<c0e2920c>] > (drm_atomic_helper_commit+0x1a0/0x1d4) > [ 70.040627] [<c0e2920c>] (drm_atomic_helper_commit) from > [<c06e74d4>] (drm_atomic_helper_disable_all+0x1c4/0x1d4) > [ 70.050913] [<c06e74d4>] (drm_atomic_helper_disable_all) from > [<c0e2943c>] (drm_atomic_helper_suspend+0xb8/0x170) > [ 70.061198] [<c0e2943c>] (drm_atomic_helper_suspend) from > [<c06e84bc>] (drm_mode_config_helper_suspend+0x24/0x58) > [ 70.071486] [<c06e84bc>] (drm_mode_config_helper_suspend) from > [<c07e9f58>] (dpm_prepare+0x1ac/0x7b0) > [ 70.080738] [<c07e9f58>] (dpm_prepare) from [<c07ea57c>] > (dpm_suspend_start+0x20/0x98) > [ 70.088679] [<c07ea57c>] (dpm_suspend_start) from [<c01954a8>] > (suspend_devices_and_enter+0xfc/0xcb8) > [ 70.097931] [<c01954a8>] (suspend_devices_and_enter) from > [<c01963a4>] (pm_suspend+0x340/0x3e8) > [ 70.106651] [<c01963a4>] (pm_suspend) from [<c01943b0>] > (state_store+0x68/0xc8) > [ 70.113982] [<c01943b0>] (state_store) from [<c0374f0c>] > (kernfs_fop_write+0x10c/0x22c) > [ 70.122016] [<c0374f0c>] (kernfs_fop_write) from [<c02c2bfc>] > (vfs_write+0xc4/0x53c) > [ 70.129795] [<c02c2bfc>] (vfs_write) from [<c02c31c4>] (ksys_write+0x60/0xec) > [ 70.136952] [<c02c31c4>] (ksys_write) from [<c0100080>] > (ret_fast_syscall+0x0/0x2c) > [ 70.144630] Exception stack(0xc28bffa8 to 0xc28bfff0) > [ 70.149697] ffa0: 00000001 00000000 00000001 > 00d220f0 00000004 00000000 > [ 70.157891] ffc0: 00000001 00000000 000d7b54 00000004 00000004 > 00000020 00d20410 00d20284 > [ 70.166083] ffe0: 000d7258 be831960 0001b93c b6ee97a0 > [ 70.171156] Code: 1592208c 1184421c e1530000 1afffff8 (e595c000) > [ 70.177483] ---[ end trace 2775110cb98281db ]--- > > > feel like follow up patch to push this into the helpers with a > > DRIVER_MODESET check like I described would be kinda neat. > > I tried using use drm_core_check_feature(dev, DRIVER_MODESET), but > since the drivers/gpu/drm/imx/imx-drm-core.c also sets the > DRIVER_MODESET flag, I am not sure how we can differentiate the fact > that imx5 is not running on a Qualcomm display driver. If you set struct drm_device.driver_features = ~DRIVER_MODESET then that should work (see the kerneldoc in the header). Latest this needs to be done before drm_dev_register, and I guess you could use the same check right there you use here. But Rob has probably an idea that fits even cleaner. Also note that I think we have 5 helper functions that would need have the new check: drm_atomic_helper_suspend/resume/shutdown and drm_mode_config_helper_suspend/resume. > Just to be clear: would it be OK to proceed with this original patch > as a minimum fix so that it can reach upstream and also stable-trees > (5.4 and 5.10)? Well with the suspend/resume fixed I think this one here is fine. See the functions you need to search for above in msm code, same check as in shutdown should work there too. > I am glad to work on a more generic solution that would also fix the > suspend/resume case. Just need some more guidance on that as I am not > familiar with this area. I'm always to help out to get a few nice patches landed! Cheers, Daniel > > Thanks, > > Fabio Estevam -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
