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| 00:02.21 | jonpry | and i think your dmesg is a red herring |
| 00:02.37 | jonpry | cause it actuall finished the memcpy, and assignment and went for the wild ride |
| 00:03.03 | jonpry | just blew up once it hit restart |
| 00:03.43 | detule | i think it never actually made those assignments |
| 00:04.05 | detule | or blew up when it tried |
| 00:04.08 | jonpry | *((u32*)reboot_code_buffer + kexec_start_address_offset/4) = image->start; |
| 00:05.20 | detule | i keep getting stuff like [ 685.944025] reboot_code_buffer: db095000 |
| 00:05.21 | detule | [ 685.985655] [d9cc3e5c] *pgd=a031141e(bad) |
| 00:05.38 | detule | what is it doing at d9 if buffer is at db? |
| 00:06.08 | jonpry | well it's trying to to flatten the image array thingy |
| 00:06.14 | jonpry | but you gave it a bad pointer |
| 00:06.17 | jonpry | or no pointer |
| 00:06.22 | detule | this btw is with *((u32*)reboot_code_buffer + ((u32*)&kexec_start_address-(u32*)relocate_new_kernel)) = image->start |
| 00:06.42 | detule | and the other corresponding vars |
| 00:07.13 | jonpry | something is just real weird |
| 00:07.24 | jonpry | like it seems to get to cpu_reset |
| 00:07.34 | jonpry | and after that kernel exceptions and stuff should be broke |
| 00:08.06 | jonpry | so i think aux core is enabled |
| 00:08.26 | detule | i am also missing +pr_crit("Past flush_cache_all\n"); |
| 00:08.49 | detule | and Bye for that matter |
| 00:09.13 | jonpry | hmm |
| 00:09.44 | jonpry | well this gets back to my theory about kexec problems with big memory |
| 00:10.22 | jonpry | setup_mm_for_reboot doesn't actually create an identity mapping for anything after 0xc000* |
| 00:10.57 | jonpry | so somehow you need to convince that kernel/kexec stuff to make sure *all* those pages it wants to allocate are located between 0x8000* and 0xc000* |
| 00:11.22 | jonpry | or its going to be fucked |
| 00:12.50 | jonpry | but this is not good |
| 00:12.51 | jonpry | ] |
| 00:12.51 | jonpry | [ 343.545765] [1: kexec: 3385] CPU: 1 Tainted: P W (3.0.8-ge2ab1bc-dirty #35) |
| 00:13.00 | jonpry | CPU:1 should be offline |
| 00:14.12 | detule | i would think them arm boyz would have figured if they needed to hotplug that cpu |
| 00:14.33 | jonpry | i think your just supposed to do it in userland |
| 00:14.40 | jonpry | or w/ governor |
| 00:14.54 | jonpry | other code generally manages processor power |
| 00:16.45 | jonpry | my modules has to do it manually. although it would make sense to me that the kexec sys call would make some effort to make sure it can succeed |
| 00:23.54 | detule | disable_nonboot_cpus() ? |
| 00:25.09 | jonpry | might work |
| 00:26.30 | detule | i mean kernel_kexec calls machine_shutdown |
| 00:26.51 | detule | which has smp ifdefed code that says smp_send_stop() |
| 00:27.15 | jonpry | well cpu 1 seems to still be online |
| 00:27.49 | detule | yeah so that seems to be failing |
| 00:29.58 | jonpry | i don't know who did it or why. but my module does the disable_non_boot_cpus() then set_cpu_online, set_cpu_present and set_cpu_possible |
| 00:30.29 | jonpry | to take it down like a tons of bricks |
| 00:31.14 | jonpry | but in the end i'm sure this depends on your platforms implementation of platform_cpu_kill and platform_cpu_die |
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| 00:31.27 | jonpry | msm has a tendency to just not implement those |
| 00:32.02 | detule | i mean this send_smp_stop has this delay loop where it keeps polling num_online_cpus() |
| 00:32.14 | detule | smp_send_stop |
| 00:32.44 | jonpry | but online could mean anything |
| 00:33.16 | detule | ugh |
| 00:33.20 | jonpry | usually it means not scheduled. and in fact it spinning somewhere. maybe on wfi |
| 00:39.16 | detule | it could be that send_smp_stop is killing 0 |
| 00:39.25 | detule | and perhaps msm8960 can't boot off of 1 |
| 00:40.02 | detule | i mean smp_send_stop doesn't touch the cpu it's running on |
| 00:40.47 | jonpry | i'm sure kexec can't work on cpu1 |
| 00:41.42 | detule | alright how can i force kexec to run on 0 - > taskset? |
| 00:42.21 | detule | scratch that |
| 00:57.59 | detule | well forced it onto cpu 0 still no luck |
| 00:58.12 | detule | perhaps i should back out all the assignments |
| 00:58.12 | detule | http://pastebin.com/hhuUYaBq |
| 01:03.46 | jonpry | so its crashing in cache_flush_all()? |
| 01:05.24 | detule | maybe...i've come to beleve those printk's are misleading :p |
| 01:07.05 | jonpry | i wonder what a111141e is |
| 01:07.11 | detule | there's an earlier flush_cache that seems to be going through... |
| 01:07.22 | jonpry | cotulla would tell us |
| 01:08.38 | detule | i need to stop now otherwise i'll be dreaming about hex numbers like i did last night....thanks for multitasking between msm and omap |
| 01:09.17 | jonpry | lol, ok |
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| 04:54.31 | constintine | https://dl.dropbox.com/u/2073566/02%20-%20Fearless%20%28Live%29.mp3 |
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| 16:19.18 | detule | jonpry, this is fubar |
| 16:21.42 | detule | if i read this correctly the kexec binary is responsible for finding a (physical) memory range to copy the new kernel to....it does this by looking at proc/iomem . I recompiled the binary to include debugging output to see what it passes to the kernel |
| 16:22.30 | detule | this is what i get http://pastebin.com/g1cViwLe -> it's asking the new kernel to be copied smack on top of the old one |
| 16:22.54 | detule | this happens before machine_kexec with the mmu ON and all |
| 16:23.18 | jonpry | i thought of another problem |
| 16:24.08 | jonpry | er |
| 16:24.18 | jonpry | yeah i think that segment stuff is fine |
| 16:24.46 | jonpry | it saves that crap in a data structure for relocate_kernel |
| 16:25.15 | DuperMan | mozart saus: don giovanni fucked 3,000 spanish chicks |
| 16:25.19 | DuperMan | ^fact |
| 16:25.24 | detule | nah i think it does load_normal_segment in kexec.c |
| 16:25.33 | detule | loading the buffer to the mem address |
| 16:25.37 | jonpry | so like segment[1] will be located at some other physical location. and it will be copied to 0x80208000 after mmu is off |
| 16:26.22 | jonpry | it doesn't look like it quite got that far |
| 16:26.26 | jonpry | 0x40168008 is a user pointer |
| 16:27.11 | detule | like there's this in kexec.c maddr = segment->mem; |
| 16:27.11 | detule | page = kimage_alloc_page(image, GFP_HIGHUSER, maddr); |
| 16:27.35 | DuperMan | tickle it with a explotive deleted |
| 16:28.10 | detule | er maybe kimage_alloc_page is more careful than i thought |
| 16:29.02 | jonpry | i still think that you need to make sure those kzalloc's have phys < 0xc* |
| 16:29.32 | jonpry | but it really depends on your implementation of setup_mm_for_reboot |
| 16:29.33 | DuperMan | netchip the testing and just see |
| 16:30.35 | jonpry | if it makes you feel any better, my kernel is all corrupted by the time it gets entered |
| 16:30.50 | DuperMan | no |
| 16:31.11 | DuperMan | corrupted in some cool non random way? |
| 16:32.22 | jonpry | maybe. i think it just only gets the first random number of pages |
| 16:32.46 | DuperMan | sounds like smart thing u said before |
| 16:45.32 | jonpry | detule, i looked at your sgsiii git repo mm stuff |
| 16:48.36 | jonpry | i think it could work |
| 16:48.48 | jonpry | assuming that it actually hits cpu_reset |
| 16:49.08 | jonpry | and cpu_reset is located below 0xc* phys |
| 16:49.24 | jonpry | and all the caches have actually been turned off |
| 16:49.42 | jonpry | thats the one i'm having trouble with |
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| 17:44.51 | detule | jonpry, would http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=commitdiff;h=1a4baafa7d203da1cceb302c2df38f0fea1c17a1#patch22 help re: the location of cpu_reset |
| 17:49.28 | jonpry | it would assuming you don't have it |
| 17:50.22 | jonpry | sometimes i wonder about this droid3 code |
| 17:52.18 | jonpry | turns out they were pumping the cache control registers with uninitialized poop |
| 17:52.38 | jonpry | no wonder it was "unreliable" |
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| 18:08.40 | detule | no i don't have that commit |
| 18:09.13 | detule | so what's the problem with setup_mm_for_reboot and addresses > 0xc* |
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| 18:14.28 | jonpry | it doesn't setup an identity map for anything >= 0xc* |
| 18:14.45 | detule | what's TASK_SIZE |
| 18:14.47 | jonpry | but really the only thing that needs to be in the idmap is cpu_reset |
| 18:14.50 | jonpry | 0xc* |
| 18:15.17 | jonpry | cause cpu_reset effectively takes out an idmap for all 4gb |
| 18:15.41 | jonpry | so whatever it takes. you need to get cpu_reset down there |
| 18:16.19 | jonpry | but in theory it should be just by virtue of being in .text |
| 18:19.31 | jonpry | i think i just rocked this kexec cache problem |
| 18:19.51 | jonpry | i got like 8 out of 8 boots |
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| 20:49.59 | detule | jonpry, got it working? |
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| 21:26.33 | *** topic/#htc-linux is Welcome to the HTC Linux project | Community portal & WiKi http://htc-linux.org | For IRC logs, HaRET & kernel mailing lists etc. see http://htc-linux.org/wiki/index.php?title=Contact | The htc-linux.org project is not affiliated with the HTC Corporation | This channel is for development purposes - Join #htc-linux-chat for offtopic |
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