Re: [edk2] AllocatePages returns EFI_NOT_FOUND

Subject: Re: [edk2] AllocatePages returns EFI_NOT_FOUND

From: Andrew Fish <afish@apple.com>

To: edk2-devel@lists.sourceforge.net

Date: 2013-09-05 17:54:25


On Sep 5, 2013, at 9:39 AM, "Kinney, Michael D" <michael.d.kinney@intel.com> wrote:

Sorin,
 
Depending on the APIs that are called between each call to AllocatePages(), memory may be allocated or freed which may cause the memory map to change.
 
You need to make sure there are no API calls that either directly or indirectly allocate memory between the call to GetMemoryMap() and the call(s) to AllocatePages().
 
Even doing an action like printing a message to the console could allocate some memory.
 
If actions that allocate memory can not be avoided, you might consider calling GetMemoryMap() again right before each call to AllocatePages().
 

While this may happen to work with the current implementation, I don't think it has to. I don't think there is any restriction in the spec that AllocatePages() can't  track pages with pool allocations. 

I would also point out that memory allocation services can be called at TPL <= TPL_NOTIFY, and other services like the Protocol Handler Services can also be called at <= TPL_NOTIFY, so a memory allocation could happen in the background. On a debug build an event handler could have a debug print, that could require a memory allocation....

The only way to get THE exact memory map is the process described in ExitBootServices() that utilized the MapKey. The 1st ExitBootServices() should shutdown all the events, so that is why it works. 

Thanks,

Andrew Fish

Best regards,
 
Mike
 
From: Sorin Vinturis [mailto:sorin.vinturis@yahoo.com] 
Sent: Thursday, September 05, 2013 1:15 AM
To: Gao, Liming; edk2-devel@lists.sourceforge.net
Subject: Re: [edk2] AllocatePages returns EFI_NOT_FOUND
 
Liming,
 
I am allocating memory iterative in each of the free memory blocks retrieved from the memory map, including 8000, 59000, 100000, 1100000, 14610000, 20200000, and allocation succeeds. The only problem is at 131D0000 address.
 
From what I observed, every new memory request is allocated starting with 131D0000 address. So the problem might be due to a memory leak or an allocated buffer which was allocated after the memory map was retrieved and not yet freed. This is why the AllocatePages function returns EFI_NOT_FOUND, because the requested page is not free/available anymore.
 
Thanks,
Sorin
 

From: "Gao, Liming" <liming.gao@intel.com>
To: Sorin Vinturis <sorin.vinturis@yahoo.com>; "edk2-devel@lists.sourceforge.net" <edk2-devel@lists.sourceforge.net> 
Sent: Thursday, 5 September 2013, 6:02
Subject: RE: [edk2] AllocatePages returns EFI_NOT_FOUND
 
Sorin:
  When your Shell Application is loaded, it will take some memory. Its taken memory may conflict with your allocated memory.
 
  Have you tried to allocate other free memory range, such as 14610000, 20200000?
 
Thanks
Liming
From: Sorin Vinturis [mailto:sorin.vinturis@yahoo.com] 
Sent: Wednesday, September 04, 2013 9:51 PM
To: Gao, Liming; edk2-devel@lists.sourceforge.net
Subject: Re: [edk2] AllocatePages returns EFI_NOT_FOUND
 
Hi Liming,
 
Yes, GetMemoryMap function sees that memory pointed by PhysicaAddress as free - marked as EfiConventionalMemory -, 
but when trying to allocate memory there, using the AllocatePages function, it fails with EFI_NOT_FOUND status.
 
Here is the memory map I am retrieving:
PhysicalAddress     NoOfPages
8000               
 80          
59000               6           
100000              3840        
1100000             28416       
131D0000            454         
14610000            47600       
20200000            130564      
40005000            564399      
100000000           189952      
The problem appears when I try to allocate memory at 131D0000 address.
 
Thanks,
Sorin
 

From: "Gao, Liming" <liming.gao@intel.com>
To: Sorin Vinturis <sorin.vinturis@yahoo.com>; "edk2-devel@lists.sourceforge.net" <edk2-devel@lists.sourceforge.net> 
Sent: Wednesday, 4 September 2013, 12:37
Subject: RE: [edk2] AllocatePages returns EFI_NOT_FOUND
 
Hi:
  Allocation requests of Type AllocateAddress means allocate pages at the address pointed to by Memory on input. If the requested pages could not be found, EFI_NOT_FOUND will return.
 
  For your issue, the memory described by PhysicalAddress should not be available. So, EFI_NOT_FOUND returns. Do you mean that you call GetMemoryMap() and see the memory pointed by PhysicalAddress is free? If yes, could you show the free memory layout and PhysicalAddress value?
 
Thanks
Liming
From: Sorin Vinturis [mailto:sorin.vinturis@yahoo.com] 
Sent: Wednesday, September 04, 2013 3:43 PM
To: edk2-devel@lists.sourceforge.net
Subject: [edk2] AllocatePages returns EFI_NOT_FOUND
 
Hi all,
 
I have an UEFI application in which I try to allocate memory of type EfiBootServicesData, using the AllocatePages function. In order to find the next available (unallocated) memory space - of type EfiConventionalMemory - I use the GetMemoryMap function. The problem which I'm facing is that when I try to allocate memory at one particular address, the AllocatePages function returns EFI_NOT_FOUND. This issue happens every time, when the application is executed, and at the exact memory address; for all remaining free memory blocks the allocation performs without problems.
 
I am calling the allocation function as follows:
gBS->AllocatePages ( AllocateAddress, EfiBootServicesData, NumberOfPages, &PhysicalAddress );
Is this scenario a memory access error? 
How should I interpret this?
 
Thanks,
Sorin
 

 

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