linux-kernel - Re: [RFC PATCH 09/33] irqchip/gic-v3-its: Split out property table allocation

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Date:   Sat, 18 Feb 2017 02:10:37 +0530
From:   Prakash B <bjsprakash.linux@...il.com>
To:     Marc Zyngier <marc.zyngier@....com>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvmarm@...ts.cs.columbia.edu, Eric Auger <eric.auger@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Christoffer Dall <christoffer.dall@...aro.org>,
        Sunil.Goutham@...ium.com, Prasun.Kapoor@...ium.com,
        bprakash@...iumnetworks.com
Subject: Re: [RFC PATCH 09/33] irqchip/gic-v3-its: Split out property table allocation

Hi Marc Zyngier,

Verifying this RFC series on Cavium ThunderX board to validate the
GICV3 changes, noticed host  crash as below.

Host booted fine with this change
"gic_flush_dcache_to_poc(page_address(prop_page), LPI_PROPBASE_SZ);"

Loading Linux 4.10.0-rc3-mz-rfc1+ ...
Loading initial ramdisk ...
EFI stub: Booting Linux Kernel...
EFI stub: Using DTB from configuration table
EFI stub: Exiting boot services and installing virtual address map...
[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 4.10.0-rc3-mz-rfc1+ (root@...ntu-gbt2s)
(gcc version 5.4.0 20160609 (Ubuntu/Linaro 5.4.0-6ubuntu1~16.04.4) )
#1 SMP Fri Feb 17 10:30:37 PST 2017
[    0.000000] Boot CPU: AArch64 Processor [431f0a10]
[    0.000000] earlycon: pl11 at MMIO 0x000087e024000000 (options '')
[    0.000000] bootconsole [pl11] enabled
[    0.000000] Unable to handle kernel paging request at virtual
address ffff800000000000
[    0.000000] pgd = ffff0000093b0000
[    0.000000] [ffff800000000000] *pgd=0000011ffff70003,
*pud=0000011ffff70003, *pmd=0000011ffff60003, *pte=0000000000000000
[    0.000000] Internal error: Oops: 96000147 [#1] SMP
[    0.000000] Modules linked in:
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.10.0-rc3-mz-rfc1+ #1
[    0.000000] Hardware name: cavium,thunder-88xx (DT)
[    0.000000] task: ffff0000090aeb80 task.stack: ffff000009080000
[    0.000000] PC is at __flush_dcache_area+0x20/0x40
[    0.000000] LR is at its_allocate_prop_table+0x6c/0x80
[    0.000000] pc : [<ffff00000809b2a0>] lr : [<ffff000008585704>]
pstate: 400000c5
[    0.000000] sp : ffff000009083d20

------
--
[    0.000000] 3c40: ffff7fe007f00660 ffff801ff76e7f20
0000000000000000 2030303030303032
[    0.000000] [<ffff00000809b2a0>] __flush_dcache_area+0x20/0x40
[    0.000000] [<ffff000008f8c0d8>] its_init+0xa4/0x384
[    0.000000] [<ffff000008f8af7c>] gic_init_bases+0x184/0x2c4
[    0.000000] [<ffff000008f8b224>] gic_of_init+0x168/0x210
[    0.000000] [<ffff000008fab3d4>] of_irq_init+0x198/0x324
[    0.000000] [<ffff000008f898f4>] irqchip_init+0x14/0x38
[    0.000000] [<ffff000008f53bd0>] init_IRQ+0xc/0x2c
[    0.000000] [<ffff000008f50a78>] start_kernel+0x268/0x3f0
[    0.000000] [<ffff000008f501e0>] __primary_switched+0x64/0x6c
[    0.000000] Code: 9ac32042 8b010001 d1000443 8a230000 (d50b7e20)
[    0.000000] ---[ end trace f68728a0d3053b52 ]---
[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[    0.000000] ---[ end Kernel panic - not syncing: Attempted to kill
the idle task!


> +static struct page *its_allocate_prop_table(gfp_t gfp_flags)
> +{
> +       struct page *prop_page;
> +
> +       prop_page = alloc_pages(gfp_flags, get_order(LPI_PROPBASE_SZ));
> +       if (!prop_page)
> +               return NULL;
> +
> +       /* Priority 0xa0, Group-1, disabled */
> +       memset(page_address(prop_page),
> +              LPI_PROP_DEFAULT_PRIO | LPI_PROP_GROUP1,
> +              LPI_PROPBASE_SZ);
> +
> +       /* Make sure the GIC will observe the written configuration */
> +       gic_flush_dcache_to_poc(page_address(gic_rdists->prop_page), LPI_PROPBASE_SZ);

gic_flush_dcache_to_poc(page_address(prop_page), LPI_PROPBASE_SZ);

>
> +       return prop_page;
> +}

Regards,
Prakash B