On Tue, Nov 06, 2018 at 05:24:15PM +0100, Thierry Reding wrote:
> From: Thierry Reding <treding@xxxxxxxxxx>
>
> Irrespective of whether or not the device has any usable outputs, the
> modesetting helpers will try to register all the resources such as CRTCs
> and planes. Unfortunately, the helpers rely on drm_mode_config_init() to
> properly set up internal data structures. Since the Tegra GPU does not
> have a display engine, the Nouveau driver doesn't set this up for Tegra,
> which results in the following oops on driver probe:
Remove DRIVER_MODESET ?
>
> [ 18.776221] Unable to handle kernel NULL pointer dereference at virtual address 0000006c
> [ 18.785401] pgd = 16bb93b7
> [ 18.789331] [0000006c] *pgd=ad58c003, *pmd=00000000
> [ 18.800757] Internal error: Oops: 206 [#1] PREEMPT SMP ARM
> [ 18.806233] Modules linked in: nouveau(+) ttm tegra_drm
> [ 18.811457] CPU: 1 PID: 245 Comm: systemd-udevd Not tainted 4.20.0-rc1 #36
> [ 18.818324] Hardware name: NVIDIA Tegra SoC (Flattened Device Tree)
> [ 18.824596] PC is at drm_plane_register_all+0x18/0x50
> [ 18.824601] LR is at drm_modeset_register_all+0xc/0x70
> [ 18.824604] pc : [<c068b938>] lr : [<c068e45c>] psr: a0000113
> [ 18.824607] sp : ed5dfc70 ip : ed742d40 fp : 00000000
> [ 18.824610] r10: 00000018 r9 : ed742d00 r8 : 00000000
> [ 18.824613] r7 : bf26ac80 r6 : 00000000 r5 : ed155650 r4 : fffffffc
> [ 18.824616] r3 : 0002f000 r2 : ffffffff r1 : 2df30000 r0 : ed155400
> [ 18.824621] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
> [ 18.824624] Control: 30c5387d Table: aeb18840 DAC: 55555555
> [ 18.824628] Process systemd-udevd (pid: 245, stack limit = 0xc66954c3)
> [ 18.824633] Stack: (0xed5dfc70 to 0xed5e0000)
> [ 18.824636] fc60: ed155400 ed155400 00000000 c068e45c
> [ 18.824641] fc80: ed155400 00000000 00000000 c06751a4 00000001 00000001 ffffffff ffffffff
> [ 18.905936] fca0: ed5dfcc0 c1204c88 ed155400 00000000 00000000 00000000 bf268c5c bf1c5cd4
> [ 18.914108] fcc0: ed710c08 9543847b 00000000 eea34810 00000000 bf268c5c 00000000 c06a3f64
> [ 18.923651] fce0: c131dd70 eea34810 c131dd74 00000000 00000000 c06a2084 eea34810 bf268c5c
> [ 18.932934] fd00: eea34844 c06a23e0 00000000 c1204c88 bf26a980 c06a22d4 eefd093c c06a23e0
> [ 18.941096] fd20: 00000000 eea34810 bf268c5c eea34844 c06a23e0 00000000 c1204c88 bf26a980
> [ 18.949259] fd40: 00000000 c06a24bc eea387b4 c1204c88 bf268c5c c06a038c 00000000 ee88335c
> [ 18.957417] fd60: eea387b4 9543847b c1275a88 bf268c5c ed12b800 c1275a88 00000000 c06a1528
> [ 18.965580] fd80: bf245be8 bf268ac8 ffffe000 bf268c5c bf268ac8 ffffe000 bf292000 c06a30d8
> [ 18.973746] fda0: bf26ab80 bf268ac8 ffffe000 bf292170 c12cf160 c1204c88 ffffe000 c0202dbc
> [ 18.981913] fdc0: ed667700 006000c0 c02b2844 0000000c 600d0013 bf26a980 00000040 c03650f8
> [ 18.990079] fde0: a00d0013 2defd000 ee800000 006000c0 006000c0 c02b2844 0000000c c03666f4
> [ 18.998244] fe00: c0358254 a00d0013 bf26a980 9543847b bf26a980 00000001 ed667700 00000001
> [ 19.006404] fe20: ed1d9ee4 c02b2880 c1204c88 bf26a980 00000000 ed5dff40 00000001 ed1d9ec0
> [ 19.014569] fe40: 00000001 c02b48c8 bf26a98c 00007fff bf26a980 c02b1a00 00000000 c02b1214
> [ 19.022735] fe60: bf26a9c8 bf26aa80 bf26ab5c bf26aab0 c0c0387c c0e62374 c0db80fc c0db8108
> [ 19.030901] fe80: c0db8160 c1204c88 bf000000 ed1296c0 06c18a20 00000000 ed1296c0 c1204c88
> [ 19.039068] fea0: 00000000 00000000 00000000 00000000 00000000 00000000 6e72656b 00006c65
> [ 19.047228] fec0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 19.055393] fee0: 00000000 00000000 00000000 00000000 00000000 9543847b 7fffffff c1204c88
> [ 19.063558] ff00: 00000000 0000000f b6c51c58 c0201204 ed5de000 0000017b bea73b0c c02b5188
> [ 19.071723] ff20: 7fffffff 00000000 00000003 c0334b4c 00000002 f1bc1000 06c18a20 00000000
> [ 19.079890] ff40: f1d0c3aa f1d24e80 f1bc1000 06c18a20 f87d90c0 f87d8e60 f70d7798 0016a000
> [ 19.088056] ff60: 0017e730 00000000 00000000 00000000 00050ba8 00000039 0000003a 00000022
> [ 19.096215] ff80: 00000000 00000013 00000000 9543847b 000000c0 00000000 b6c51c58 0000000f
> [ 19.104378] ffa0: 0000017b c02011d4 00000000 b6c51c58 0000000f b6c51c58 00000000 00559220
> [ 19.112543] ffc0: 00000000 b6c51c58 0000000f 0000017b 00000000 00000000 00546958 bea73b0c
> [ 19.120708] ffe0: bea73af8 bea73ae8 b6c44c14 b6b4b710 600d0010 0000000f 00000000 00000000
> [ 19.128884] [<c068b938>] (drm_plane_register_all) from [<c068e45c>] (drm_modeset_register_all+0xc/0x70)
> [ 19.138273] [<c068e45c>] (drm_modeset_register_all) from [<c06751a4>] (drm_dev_register+0x168/0x1c4)
> [ 19.147581] [<c06751a4>] (drm_dev_register) from [<bf1c5cd4>] (nouveau_platform_probe+0x6c/0x88 [nouveau])
> [ 19.157434] [<bf1c5cd4>] (nouveau_platform_probe [nouveau]) from [<c06a3f64>] (platform_drv_probe+0x48/0x98)
> [ 19.167256] [<c06a3f64>] (platform_drv_probe) from [<c06a2084>] (really_probe+0x1e0/0x2cc)
> [ 19.175516] [<c06a2084>] (really_probe) from [<c06a22d4>] (driver_probe_device+0x60/0x16c)
> [ 19.183777] [<c06a22d4>] (driver_probe_device) from [<c06a24bc>] (__driver_attach+0xdc/0xe0)
> [ 19.192210] [<c06a24bc>] (__driver_attach) from [<c06a038c>] (bus_for_each_dev+0x74/0xb4)
> [ 19.200383] [<c06a038c>] (bus_for_each_dev) from [<c06a1528>] (bus_add_driver+0x1c0/0x204)
> [ 19.208644] [<c06a1528>] (bus_add_driver) from [<c06a30d8>] (driver_register+0x74/0x108)
> [ 19.216928] [<c06a30d8>] (driver_register) from [<bf292170>] (nouveau_drm_init+0x170/0x1000 [nouveau])
> [ 19.226429] [<bf292170>] (nouveau_drm_init [nouveau]) from [<c0202dbc>] (do_one_initcall+0x54/0x284)
> [ 19.235557] [<c0202dbc>] (do_one_initcall) from [<c02b2880>] (do_init_module+0x64/0x214)
> [ 19.243643] [<c02b2880>] (do_init_module) from [<c02b48c8>] (load_module+0x1e30/0x24a8)
> [ 19.251643] [<c02b48c8>] (load_module) from [<c02b5188>] (sys_finit_module+0xc4/0xdc)
> [ 19.259470] [<c02b5188>] (sys_finit_module) from [<c02011d4>] (__sys_trace_return+0x0/0x2c)
> [ 19.267807] Exception stack(0xed5dffa8 to 0xed5dfff0)
> [ 19.272853] ffa0: 00000000 b6c51c58 0000000f b6c51c58 00000000 00559220
> [ 19.281018] ffc0: 00000000 b6c51c58 0000000f 0000017b 00000000 00000000 00546958 bea73b0c
> [ 19.289182] ffe0: bea73af8 bea73ae8 b6c44c14 b6b4b710
> [ 19.294224] Code: e5b54250 e1550004 0a00000c e2444004 (e5943070)
> [ 19.300863] ---[ end trace 7cb25d313b9a3b9d ]---
>
> Fix this by initializing the mode configuration structure in the Tegra
> case as well. No other modeset helper setup is required.
>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> ---
> drivers/gpu/drm/nouveau/nouveau_platform.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/drivers/gpu/drm/nouveau/nouveau_platform.c b/drivers/gpu/drm/nouveau/nouveau_platform.c
> index 039e23548e08..1d4c895b379d 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_platform.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_platform.c
> @@ -34,6 +34,8 @@ static int nouveau_platform_probe(struct platform_device *pdev)
> if (IS_ERR(drm))
> return PTR_ERR(drm);
>
> + drm_mode_config_init(drm);
> +
> ret = drm_dev_register(drm, 0);
> if (ret < 0) {
> drm_dev_put(drm);
> @@ -46,7 +48,10 @@ static int nouveau_platform_probe(struct platform_device *pdev)
> static int nouveau_platform_remove(struct platform_device *pdev)
> {
> struct drm_device *dev = platform_get_drvdata(pdev);
> +
> + drm_mode_config_cleanup(dev);
> nouveau_drm_device_remove(dev);
> +
> return 0;
> }
>
> --
> 2.19.1
>
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--
Ville Syrjälä
Intel
