Re: [PATCH] hw/sd/pxa2xx_mmci: Disable reentrancy detection

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

On 13/12/23 19:04, Guenter Roeck wrote:
> On 12/13/23 09:19, Philippe Mathieu-Daudé wrote:
>> Hi Guenter,
>>
>> On 13/12/23 18:12, Peter Maydell wrote:
>>> On Wed, 13 Dec 2023 at 01:49, Guenter Roeck <linux@roeck-us.net> wrote:
>>>>
>>>> All tests using pxa2xx_mmc to access mmc cards on pxa2xx platforms
>>>> such as borzoi fail starting with commit a2e1753b80 ("memory: prevent
>>>> dma-reentracy issues"). Disable reentrancy guard to fix the problem.
>>>>
>>>> Fixes: a2e1753b80 ("memory: prevent dma-reentracy issues")
>>>> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
>>>> ---
>>>>   hw/sd/pxa2xx_mmci.c | 2 ++
>>>>   1 file changed, 2 insertions(+)
>>>>
>>>> diff --git a/hw/sd/pxa2xx_mmci.c b/hw/sd/pxa2xx_mmci.c
>>>> index 5e8ea69188..27ae8f2888 100644
>>>> --- a/hw/sd/pxa2xx_mmci.c
>>>> +++ b/hw/sd/pxa2xx_mmci.c
>>>> @@ -555,6 +555,8 @@ static void pxa2xx_mmci_instance_init(Object *obj)
>>>>       qdev_init_gpio_out_named(dev, &s->rx_dma, "rx-dma", 1);
>>>>       qdev_init_gpio_out_named(dev, &s->tx_dma, "tx-dma", 1);
>>>>
>>>> +    s->iomem.disable_reentrancy_guard = true;
>>>> +
>>>
>>> All patches that set this flag should include a comment which
>>> explains what the device access path that triggers the reentrancy
>>> is, please.
>>
>> Can we get a reproducer or backtrace please?
> 
> qemu-system-arm: warning: Blocked re-entrant IO on MemoryRegion: 
> pxa2xx-mmci at addr: 0x40
> [    0.770246] mmc0: invalid bus width
> [    0.770962] mmc0: error -22 whilst initialising SD card
> [    0.828179] mmc0: invalid bus width
> [    0.828445] mmc0: error -22 whilst initialising SD card
> 
> with:
> 
> qemu-system-arm -M borzoi -kernel arch/arm/boot/zImage -no-reboot 
> -snapshot \
>      -device sd-card,drive=d0 -drive 
> file=/tmp/flash,format=raw,if=none,id=d0 \
>      -usb -device usb-net,netdev=net0 -netdev user,id=net0 \
>      --append "root=/dev/mmcblk0 rootwait console=ttyS0"

Thank you, I'll have a look after Christmas.

Regards,

Phil.