On 06/12/2013 12:21 PM, Stephen Boyd wrote:
> On 06/11, Rob Herring wrote:
>> On Tue, Jun 11, 2013 at 8:30 PM, Stephen Boyd <sboyd@xxxxxxxxxxxxxx> wrote:
>>
>>> diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
>>> index e0d8565..04fe160 100644
>>> --- a/arch/arm/mm/mmu.c
>>> +++ b/arch/arm/mm/mmu.c
>>> @@ -938,8 +938,12 @@ static void __init pci_reserve_io(void)
>>> #ifdef CONFIG_DEBUG_LL
>>> void __init debug_ll_io_init(void)
>>> {
>>> + struct vm_struct *vm;
>>> + struct static_vm *svm;
>>> struct map_desc map;
>>>
>>> + svm = early_alloc_aligned(sizeof(*svm), __alignof__(*svm));
>>> +
>>> debug_ll_addr(&map.pfn, &map.virtual);
>>> if (!map.pfn || !map.virtual)
>>> return;
>>> @@ -948,6 +952,15 @@ void __init debug_ll_io_init(void)
>>> map.length = PAGE_SIZE;
>>> map.type = MT_DEVICE;
>>> create_mapping(&map);
>>> +
>>> + vm = &svm->vm;
>>> + vm->addr = (void *)map.virtual;
>>> + vm->size = map.length;
>>> + vm->phys_addr = __pfn_to_phys(map.pfn);
>>> + vm->flags = VM_IOREMAP | VM_ARM_STATIC_MAPPING;
>>> + vm->flags |= VM_ARM_MTYPE(map.type);
>>> + vm->caller = debug_ll_io_init;
>>> + add_static_vm_early(svm);
>>
>> Can you use vm_reserve_area_early here or perhaps just call
>> iotable_init instead of create_mapping directly? I don't recall if
>> there was some reason I didn't do that.
>>
>
> I had iotable_init() before but I thought it was better to have
> the ->caller argument say debug_ll_io_init() instead of
> iotable_init(). Shall I extract out the similar code?
Well, that's always welcome...
Another option would be use __builtin_return_address. That would change
vmallocinfo from showing iotable_init to the caller of iotable_init.
Arguably, knowing the caller would be better.
Rob
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