refac: (in hpdcache interface) separate the modules for dcache and icache

[takeshiho0531]

for GSoC Project: Transforming the OpenHW High Performance Data Cache into a High Performance Instruction Cache

• what:

  • I moved the parts of the D$ instantiation in cva6_hpdcache_subsystem.sv (the parts involving cva6_hpdcache_cmo_if_adapter, hwpf_stride_wrapper, and hpdcache, excluding the I$ instantiation and AXI arbiter instantiation) into a single module called cva6_hpdcache_wrapper and placed it in a separate file (cva6_hpdcache_wrapper.sv).
  • In the cva6_hpdcache_wrapper module, new ports were added to connect with the input and output ports of the AXI arbiter instantiation.

• purpose:

  • To clarify the area of the dcache
  • To enable the use of hpdcache as icache, (I think) it is better to modularize the part where hpdcache is currently used as dcache, so that this module can also be called by icache in the future.
  • PR #1978 (I aborted this PR) is too large to debug easily, so it has been split.

• TODO

  • assertion
  • comment

• What's next?

  • extend cva6_hpdcache_if_adapter so that it can also convert input request/response to the appropriate type for hpdcache when using hpdcache as icache. (ex. input type:icache_req_t → output type: hpdcache_req_t)

[github-actions[bot]]

:x: failed run, report available here.

[github-actions[bot]]

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[github-actions[bot]]

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[github-actions[bot]]

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[takeshiho0531]

@cfuguet @AileonN

I have some questions...

• I think I need to add some assertions for some input types of module cva6_hpdcache_wrapper(ex. hpdcache_mem_req_t) since they need to fulfill certain macros. Is it better to add some macros for assertions corresponding to the macros(ex. HPDCACHE_TYPEDEF_MEM_ATTR_T) in hpdcache_typedef.svh?
• I'm not sure how to solve these errors(↓) in (git-lab?) ci.... They occurred when testing ASIC Synthesis cv32a6_embedded.

  Error: ../..//core/cache_subsystem/cva6_hpdcache_subsystem.sv:179: Unable to open file `hpdcache_typedef.svh': No such file or directory. (VER-41)
  Error: ../..//core/cache_subsystem/cva6_hpdcache_subsystem_axi_arbiter.sv:173: Package 'hpdcache_pkg' has not been analyzed for import or content extraction. (VER-224)
  Error: ../..//core/cache_subsystem/cva6_hpdcache_subsystem_axi_arbiter.sv:173: The symbol 'HPDCACHE_MEM_READ' is not defined. (VER-956)
  Error: ../..//core/cache_subsystem/cva6_hpdcache_subsystem_axi_arbiter.sv:174: Package 'hpdcache_pkg' has not been analyzed for import or content extraction. (VER-224)
  Error: ../..//core/cache_subsystem/cva6_hpdcache_subsystem_axi_arbiter.sv:174: invalid symbol hpdcache_mem_atomic_e found in expression. (VER-255)
  Error: ../..//core/cache_subsystem/cva6_hpdcache_if_adapter.sv:17: Package 'hpdcache_pkg' has not been analyzed for import or content extraction. (VER-224)
  Error: ../..//core/cache_subsystem/cva6_hpdcache_if_adapter.sv:17: Syntax error at or near token 'hpdcache_cfg_t'. (VER-294)
  Error: ../..//core/cache_subsystem/cva6_hpdcache_wrapper.sv:15: Unable to open file `hpdcache_typedef.svh': No such file or directory. (VER-41)

[cfuguet]

I'm not sure what is the issue here... it looks like the +incdir directive did not work for the ASIC synthesis. The tool is not finding the hpdcache_typedef.svh header file in the HPDcache subdirectory. All the following errors are the consequence of this.

@JeanRochCoulon could you please share the synthesis report ?

@takeshiho0531 is working in the GSoC project to adapt the HPDcache and enable its usage as an Instruction Cache as well. As a first step, she proposes this refactoring of the hpdcache subsystem which simplifies greatly the future integration of the HPDcache as Icache of the CVA6

[JeanRochCoulon]

Maybe I see the problem. The Asic synthesis flow has been updated last week. can you rebase your PR to update the flow ?

[cfuguet]

Maybe I see the problem.

The Asic synthesis flow has been updated last week.

can you rebase your PR to update the flow ?

@takeshiho0531 can you rebase ?

[github-actions[bot]]

:heavy_check_mark: successful run, report available here.

[cfuguet]

Hi @takeshiho0531,

I think your PR is ready to be merged, but the commits messages are not convenient. Could you please rebase your PR and make a single commit with an appropriate message ?

Thanks !

[JeanRochCoulon]

Hello @takeshiho0531 Thank for your contributions. I am ready to merge. Tell me !

[cfuguet]

Hi @JeanRochCoulon, I think you can merge @takeshiho0531 contribution. You are doing a merge right ? What is the message of the merge commit ? It is just that there are 9 commits with no so useful descriptions, but if the message is the one in the PR description that is ok.

[cfuguet]

However, I would change the description of the PR to :

refactor hpdcache_cache_subsystem module code to ease reutilization

[JeanRochCoulon]

The commits are squashed, and I set your description.