On 2015년 03월 12일 13:36, Hyungwon Hwang wrote:
> Since commit 0f04cf8df0b20a97369cb634663fef0578cbf273 ("drm/exynos:
> fix wrong pipe calculation for crtc"), fimd_clear_channel() can be
> called when is_drm_iommu_supported() returns true. In this case,
> the kernel is going to be panicked because crtc is not set yet.
Nice catch!!!
>
> [ 1.211156] [drm] Initialized drm 1.1.0 20060810
> [ 1.216785] Unable to handle kernel NULL pointer dereference at virtual address 00000350
> [ 1.223415] pgd = c0004000
> [ 1.226086] [00000350] *pgd=00000000
> [ 1.229649] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
> [ 1.234940] Modules linked in:
> [ 1.237982] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.0.0-rc1-00062-g7a7cc79-dirty #123
> [ 1.246136] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [ 1.252214] task: ee8c8000 ti: ee8d0000 task.ti: ee8d0000
> [ 1.257606] PC is at fimd_wait_for_vblank+0x8/0xc8
> [ 1.262370] LR is at fimd_bind+0x138/0x1a8
> [ 1.266450] pc : [<c02fb63c>] lr : [<c02fb834>] psr: 20000113
> [ 1.266450] sp : ee8d1d28 ip : 00000000 fp : 00000000
> [ 1.277906] r10: 00000001 r9 : c09d693c r8 : c0a2d6a8
> [ 1.283114] r7 : 00000034 r6 : 00000001 r5 : ee0bb400 r4 : ee244c10
> [ 1.289624] r3 : 00000000 r2 : 00000000 r1 : 00000001 r0 : 00000000
> [ 1.296135] Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
> [ 1.303426] Control: 10c5387d Table: 4000404a DAC: 00000015
> [ 1.309154] Process swapper/0 (pid: 1, stack limit = 0xee8d0210)
> [ 1.315143] Stack: (0xee8d1d28 to 0xee8d2000)
> [ 1.319486] 1d20: 00000000 c0113d18 ee0bb400 ee0bb400 ee245c30 eebbe210
> [ 1.327645] 1d40: ee008a40 ee244c10 ee0bb400 00000001 00000034 c02fb834 00000000 c030a858
> [ 1.335804] 1d60: ee244a10 eeb60780 ee008a40 eeb60740 ee0bb400 c03030d0 00000000 00000000
> [ 1.343963] 1d80: ee244a10 ee0bb400 00000000 eeb60740 eeb60810 00000000 00000000 c02f6ba4
> [ 1.352123] 1da0: ee0bb400 00000000 00000000 c02e0500 ee244a00 c0a04a14 ee0bb400 c02e1de4
> [ 1.360282] 1dc0: 00000000 c030a858 00000002 eeb60820 eeb60820 00000002 eeb60780 c03033d4
> [ 1.368441] 1de0: c06e9cec 00000000 ee244a10 eeb60780 c0a056f8 c03035fc c0a04b24 c0a04b24
> [ 1.376600] 1e00: ee244a10 00000001 c0a049d0 c02f6d34 c0ad462c eeba0790 00000000 ee244a10
> [ 1.384759] 1e20: ffffffed c0a049d0 00000000 c03090b0 ee244a10 c0ad462c c0a2d840 c03077a0
> [ 1.392919] 1e40: eeb5e880 c024b738 000008db ee244a10 c0a049d0 ee244a44 00000000 c09e71d8
> [ 1.401078] 1e60: 000000c6 c0307a6c c0a049d0 00000000 c03079e0 c0305ea8 ee826e5c ee1dc7b4
> [ 1.409237] 1e80: c0a049d0 eeb5e880 c0a058a8 c0306e2c c0896204 c0a049d0 c06e9d10 c0a049d0
> [ 1.417396] 1ea0: c06e9d10 c0ad4600 00000000 c0308360 00000000 00000003 c06e9d10 c02f6e14
> [ 1.425555] 1ec0: 00000000 c0896204 ffffffff 00000000 00000000 00000000 00000000 00000000
> [ 1.433714] 1ee0: 00000000 00000000 c02f6d5c c02f6d5c 00000000 eeb5d740 c09e71d8 c0008a30
> [ 1.441874] 1f00: ef7fca5e 00000000 00000000 00000066 00000000 ee8d1f28 c003ff1c c02514e8
> [ 1.450033] 1f20: 60000113 ffffffff c093906c ef7fca5e 000000c6 c004018c 00000000 c093906c
> [ 1.458192] 1f40: c08a9690 c093840c 00000006 00000006 c09eb2ac c09c0d74 00000006 c09c0d54
> [ 1.466351] 1f60: c0a3d680 c09745a0 c09d693c 000000c6 00000000 c0974db4 00000006 00000006
> [ 1.474510] 1f80: c09745a0 ffffffff 00000000 c0692e00 00000000 00000000 00000000 00000000
> [ 1.482669] 1fa0: 00000000 c0692e08 00000000 c000f040 00000000 00000000 00000000 00000000
> [ 1.490828] 1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
> [ 1.498988] 1fe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffffffff ffffffff
> [ 1.507159] [<c02fb63c>] (fimd_wait_for_vblank) from [<c02fb834>] (fimd_bind+0x138/0x1a8)
> [ 1.515313] [<c02fb834>] (fimd_bind) from [<c03030d0>] (component_bind_all+0xc4/0x20c)
> [ 1.523209] [<c03030d0>] (component_bind_all) from [<c02f6ba4>] (exynos_drm_load+0xa0/0x140)
> [ 1.531632] [<c02f6ba4>] (exynos_drm_load) from [<c02e0500>] (drm_dev_register+0xa0/0xf4)
> [ 1.539788] [<c02e0500>] (drm_dev_register) from [<c02e1de4>] (drm_platform_init+0x44/0xcc)
> [ 1.548121] [<c02e1de4>] (drm_platform_init) from [<c03033d4>] (try_to_bring_up_master.part.1+0xc8/0x104)
> [ 1.557668] [<c03033d4>] (try_to_bring_up_master.part.1) from [<c03035fc>] (component_master_add_with_match+0xd0/0x118)
> [ 1.568431] [<c03035fc>] (component_master_add_with_match) from [<c02f6d34>] (exynos_drm_platform_probe+0xf0/0x118)
> [ 1.578847] [<c02f6d34>] (exynos_drm_platform_probe) from [<c03090b0>] (platform_drv_probe+0x48/0x98)
> [ 1.588052] [<c03090b0>] (platform_drv_probe) from [<c03077a0>] (driver_probe_device+0x140/0x380)
> [ 1.596902] [<c03077a0>] (driver_probe_device) from [<c0307a6c>] (__driver_attach+0x8c/0x90)
> [ 1.605321] [<c0307a6c>] (__driver_attach) from [<c0305ea8>] (bus_for_each_dev+0x54/0x88)
> [ 1.613480] [<c0305ea8>] (bus_for_each_dev) from [<c0306e2c>] (bus_add_driver+0xec/0x200)
> [ 1.621640] [<c0306e2c>] (bus_add_driver) from [<c0308360>] (driver_register+0x78/0xf4)
> [ 1.629625] [<c0308360>] (driver_register) from [<c02f6e14>] (exynos_drm_init+0xb8/0x11c)
> [ 1.637785] [<c02f6e14>] (exynos_drm_init) from [<c0008a30>] (do_one_initcall+0xac/0x1ec)
> [ 1.645950] [<c0008a30>] (do_one_initcall) from [<c0974db4>] (kernel_init_freeable+0x194/0x268)
> [ 1.654626] [<c0974db4>] (kernel_init_freeable) from [<c0692e08>] (kernel_init+0x8/0xe4)
> [ 1.662699] [<c0692e08>] (kernel_init) from [<c000f040>] (ret_from_fork+0x14/0x34)
> [ 1.670246] Code: eaffffd5 c09df884 e92d40f0 e24dd01c (e5905350)
> [ 1.676408] ---[ end trace 804468492f306a6f ]---
> [ 1.680948] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
> [ 1.680948]
> [ 1.690035] CPU1: stopping
> [ 1.692727] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G D 4.0.0-rc1-00062-g7a7cc79-dirty #123
> [ 1.702097] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [ 1.708192] [<c0016c84>] (unwind_backtrace) from [<c00129bc>] (show_stack+0x10/0x14)
> [ 1.715908] [<c00129bc>] (show_stack) from [<c0696f58>] (dump_stack+0x78/0xc8)
> [ 1.723108] [<c0696f58>] (dump_stack) from [<c0015020>] (handle_IPI+0x16c/0x2b4)
> [ 1.730485] [<c0015020>] (handle_IPI) from [<c00086bc>] (gic_handle_irq+0x64/0x6c)
> [ 1.738036] [<c00086bc>] (gic_handle_irq) from [<c00134c0>] (__irq_svc+0x40/0x74)
> [ 1.745498] Exception stack(0xee8fdf98 to 0xee8fdfe0)
> [ 1.750533] df80: 00000000 00000000
> [ 1.758695] dfa0: ee8fdfe8 c0021780 c09df938 00000015 10c0387d c0a3d988 4000406a c09df8d4
> [ 1.766853] dfc0: c0a27a74 c09df940 01000000 ee8fdfe0 c00101c0 c00101c4 60000113 ffffffff
> [ 1.775015] [<c00134c0>] (__irq_svc) from [<c00101c4>] (arch_cpu_idle+0x30/0x3c)
> [ 1.782397] [<c00101c4>] (arch_cpu_idle) from [<c005e804>] (cpu_startup_entry+0x180/0x324)
> [ 1.790639] [<c005e804>] (cpu_startup_entry) from [<40008764>] (0x40008764)
> [ 1.797579] CPU0: stopping
> [ 1.800272] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G D 4.0.0-rc1-00062-g7a7cc79-dirty #123
> [ 1.809642] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [ 1.815730] [<c0016c84>] (unwind_backtrace) from [<c00129bc>] (show_stack+0x10/0x14)
> [ 1.823450] [<c00129bc>] (show_stack) from [<c0696f58>] (dump_stack+0x78/0xc8)
> [ 1.830653] [<c0696f58>] (dump_stack) from [<c0015020>] (handle_IPI+0x16c/0x2b4)
> [ 1.838030] [<c0015020>] (handle_IPI) from [<c00086bc>] (gic_handle_irq+0x64/0x6c)
> [ 1.845581] [<c00086bc>] (gic_handle_irq) from [<c00134c0>] (__irq_svc+0x40/0x74)
> [ 1.853043] Exception stack(0xc09ddf60 to 0xc09ddfa8)
> [ 1.858081] df60: 00000000 00000000 c09ddfb0 c0021780 c09df938 00000001 ffffffff c0a3d680
> [ 1.866239] df80: c09c0dec c09df8d4 c0a27a74 c09df940 01000000 c09ddfa8 c00101c0 c00101c4
> [ 1.874396] dfa0: 60000113 ffffffff
> [ 1.877872] [<c00134c0>] (__irq_svc) from [<c00101c4>] (arch_cpu_idle+0x30/0x3c)
> [ 1.885251] [<c00101c4>] (arch_cpu_idle) from [<c005e804>] (cpu_startup_entry+0x180/0x324)
> [ 1.893499] [<c005e804>] (cpu_startup_entry) from [<c0974bc8>] (start_kernel+0x324/0x37c)
> [ 1.901655] [<c0974bc8>] (start_kernel) from [<40008074>] (0x40008074)
> [ 1.908161] CPU3: stopping
> [ 1.910855] CPU: 3 PID: 0 Comm: swapper/3 Tainted: G D 4.0.0-rc1-00062-g7a7cc79-dirty #123
> [ 1.920225] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
> [ 1.926313] [<c0016c84>] (unwind_backtrace) from [<c00129bc>] (show_stack+0x10/0x14)
> [ 1.934034] [<c00129bc>] (show_stack) from [<c0696f58>] (dump_stack+0x78/0xc8)
> [ 1.941237] [<c0696f58>] (dump_stack) from [<c0015020>] (handle_IPI+0x16c/0x2b4)
> [ 1.948613] [<c0015020>] (handle_IPI) from [<c00086bc>] (gic_handle_irq+0x64/0x6c)
> [ 1.956165] [<c00086bc>] (gic_handle_irq) from [<c00134c0>] (__irq_svc+0x40/0x74)
> [ 1.963626] Exception stack(0xee901f98 to 0xee901fe0)
> [ 1.968661] 1f80: 00000000 00000000
> [ 1.976823] 1fa0: ee901fe8 c0021780 c09df938 00000015 10c0387d c0a3d988 4000406a c09df8d4
> [ 1.984982] 1fc0: c0a27a74 c09df940 01000000 ee901fe0 c00101c0 c00101c4 60000113 ffffffff
> [ 1.993143] [<c00134c0>] (__irq_svc) from [<c00101c4>] (arch_cpu_idle+0x30/0x3c)
> [ 2.000522] [<c00101c4>] (arch_cpu_idle) from [<c005e804>] (cpu_startup_entry+0x180/0x324)
> [ 2.008765] [<c005e804>] (cpu_startup_entry) from [<40008764>] (0x40008764)
> [ 2.015710] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
>
> Signed-off-by: Hyungwon Hwang <human.hwang@xxxxxxxxxxx>
> Cc: Inki Dae <inki.dae@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/exynos/exynos_drm_fimd.c | 31 +++++++++++++------------------
> 1 file changed, 13 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> index 925fc69..31dfa80 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
> @@ -284,14 +284,9 @@ static void fimd_clear_channel(struct fimd_context *ctx)
> }
> }
>
> -static int fimd_ctx_initialize(struct fimd_context *ctx,
> +static int fimd_iommu_attach_devices(struct fimd_context *ctx,
> struct drm_device *drm_dev)
> {
> - struct exynos_drm_private *priv;
> - priv = drm_dev->dev_private;
> -
> - ctx->drm_dev = drm_dev;
> - ctx->pipe = priv->pipe++;
>
> /* attach this sub driver to iommu mapping if supported. */
> if (is_drm_iommu_supported(ctx->drm_dev)) {
> @@ -313,7 +308,7 @@ static int fimd_ctx_initialize(struct fimd_context *ctx,
> return 0;
> }
>
> -static void fimd_ctx_remove(struct fimd_context *ctx)
> +static void fimd_iommu_detach_devices(struct fimd_context *ctx)
> {
> /* detach this sub driver from iommu mapping if supported. */
> if (is_drm_iommu_supported(ctx->drm_dev))
> @@ -1056,25 +1051,25 @@ static int fimd_bind(struct device *dev, struct device *master, void *data)
> {
> struct fimd_context *ctx = dev_get_drvdata(dev);
> struct drm_device *drm_dev = data;
> + struct exynos_drm_private *priv = drm_dev->dev_private;
> int ret;
>
> - ret = fimd_ctx_initialize(ctx, drm_dev);
> - if (ret) {
> - DRM_ERROR("fimd_ctx_initialize failed.\n");
> - return ret;
> - }
> + ctx->drm_dev = drm_dev;
> + ctx->pipe = priv->pipe++;
>
> ctx->crtc = exynos_drm_crtc_create(drm_dev, ctx->pipe,
> EXYNOS_DISPLAY_TYPE_LCD,
> &fimd_crtc_ops, ctx);
> - if (IS_ERR(ctx->crtc)) {
> - fimd_ctx_remove(ctx);
> - return PTR_ERR(ctx->crtc);
> - }
>
> if (ctx->display)
> exynos_drm_create_enc_conn(drm_dev, ctx->display);
>
> + ret = fimd_iommu_attach_devices(ctx, drm_dev);
> + if (ret) {
> + DRM_ERROR("fimd_ctx_initialize failed.\n");
> + return ret;
> + }
Above error message wouldn't be unnecessary because the error message is
already printed out at fimd_iommu_attach_devices function. But this is a
trivial issue so I fixed and merged it.
Thanks,
Inki Dae
> +
> return 0;
>
> }
> @@ -1086,10 +1081,10 @@ static void fimd_unbind(struct device *dev, struct device *master,
>
> fimd_dpms(ctx->crtc, DRM_MODE_DPMS_OFF);
>
> + fimd_iommu_detach_devices(ctx);
> +
> if (ctx->display)
> exynos_dpi_remove(ctx->display);
> -
> - fimd_ctx_remove(ctx);
> }
>
> static const struct component_ops fimd_component_ops = {
> --
> 1.9.1
>
>
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel
