On Thu, Jul 04, 2024 at 01:04:56PM +0530, Sughosh Ganu wrote: > The aim of this patch series is to fix the current state of > incoherence between modules when it comes to memory usage. The primary > issue that this series is trying to fix is that the EFI memory module > which is responsible for allocating and freeing memory, does not have > any visibility of the memory that is being used by the LMB > module. This is further complicated by the fact that the LMB > allocations are caller specific -- the LMB memory map is not global > nor persistent. This means that the memory "allocated" by the LMB > module might be relevant only for a given function. Hence one of the > requirements for making the memory usage visible across modules is to > make LMB allocations persistent and global, and then have means to > communicate the use of memory across modules. > > The first set of patches in this series work on making the LMB memory > map persistent and global. This is being done keeping in mind the > usage of LMB memory by platforms where the same memory region can be > used to load multiple different images. What is not allowed is to > overwrite memory that has been allocated by the other module, > currently the EFI memory module. This is being achieved by introducing > a new flag, LMB_NOOVERWRITE, which represents memory which cannot be > re-requested once allocated. > > A review comment on the earlier version was to do away with the static > arrays for the LMB lists of free and used memory. This version > uses the alloced list data structure for the LMB lists. > > The second set of patches are making changes to the EFI memory module > to make use of the LMB functions to allocate and free memory. A > *_flags() version of LMB API's has been introduced for the same. The > earlier version was using notification mechanism from both LMB and EFI > modules to maintain memory coherence. This version makes use of the > LMB API functions for the memory allocations. This is based on review > comments of EFI maintainers.
On am64x_evm_a53, the last test in test/py/tests/test_net_boot.py fails
due to:
...
TFTP from server 192.168.116.10; our IP address is 192.168.116.23
Filename 'pxelinux.cfg/default-arm-k3'.
Load address: 0x80100000
Loading: ################################################## 64 Bytes
8.8 KiB/s
done
Bytes transferred = 64 (40 hex)
1 pxe ready ethernet 0 [email protected]
extlinux/extlinux.conf
** Booting bootflow '[email protected]' with pxe
Retrieving file: pxelinux.cfg/default-arm
am65_cpsw_nuss_port ethernet@8000000port@1: K3 CPSW: rflow_id_base: 16
link up on port 1, speed 1000, full duplex
Using ethernet@8000000port@1 device
TFTP from server 192.168.116.10; our IP address is 192.168.116.23
Filename 'pxelinux.cfg/default-arm'.
TFTP error: trying to overwrite reserved memory...
Couldn't retrieve pxelinux.cfg/default-arm
And note that the pxelinux.cfg files are created as defined by the
example within the test. This test is also still fine on Pi 4.
--
Tom
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