devops: add s390x & ppc64le CI (#15925)

* devops: move s390x and ppc64le ci build

we have access to ubuntu-24.04-s390x and ppc64le images now

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: disable ppc64le for now since they have compiler errors

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: stop warnings as errors

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: switch to non-macro flag

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: going the llama macro route

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: add big-endian gguf test models

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: disable ppc64le to test s390x, check test build

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: dup .gguf.inp files for big-endian tests

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: dup .gguf.out files for big-endian too

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: add python setup and endian byteswap

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: pooring thing does not have s390x python3

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: add missing rust compiler for s390x

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: try rust actions runner

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Revert "devops: try rust actions runner"

This reverts commit 3f8db04356033d6c1d7eccc75ca396bc5298250c.

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: try a different path for rust

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: dump home directory and user info

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: install gguf-py only

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: missed relative path

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: remove big-endian files since local swapping is working

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: revert test-tokenizer-0 cmakelists

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Fix unicode flags conversion from and to uint16_t

Bitfields are allocated in different order on s390x

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Simplify byteswap command

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Add byteswapping and git-lfs for test-tokenizers-ggml-vocabs

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Fix endianness detection in vocab loader

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Disable test-thread-safety on s390x

In this test a model is downloaded,
then immediately loaded to check if more downloads are needed,
and then used for test.

There is no clean way to separate all those steps
 to add byteswapping between them, so just skip this test.

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Fix q8_0 test in test-quantize-fns

vec_signed uses unexpected rounding mode.
Explicitly use different rounding function.

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: add big-endian stories260K

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: add s390x test-eval-callback

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: fix test does not exist

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: fix model not found llama-eval-callback

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Fix q3_K dot product error in test-quantize-fns on s390x

Array q8bytes had only 4 elements allocated, but 8 elements accessed.
This lead to write out of bounds and later read of overwritten values out of bounds
and incorrect result.

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: re-enable ppc64le for testing

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: activate test-thread-safety for s390x

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: disable ppc64le tests

for some reason it keeps failing test-thread-safety tests and I do not
    have a machine that is able to replicate the tests.

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* devops: LLAMA_FATAL_WARNINGS=ON

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Correct repository URL for s390x for test-thread-safety model

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Fix fs_get_cache_directory

Ensure it works even if both XDG_CACHE_HOME and HOME are unset.
This might happen in containers.

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Re-enable CI for ppc64le

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Fortify ggml_rope_impl

Only memcpy data from sections argument if it's non-NULL.

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>

* Add TODO in struct unicode_cpt_flags to reimplement it in endian-independent way

* Update URL for big-endian model

* Update .github/workflows/build.yml

Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

* Update remaining mentions of BE models to ggml-org/models repo

---------

Signed-off-by: Aaron Teo <aaron.teo1@ibm.com>
Co-authored-by: Aleksei Nikiforov <aleksei.nikiforov@linux.ibm.com>
Co-authored-by: Aleksei Nikiforov <103434461+AlekseiNikiforovIBM@users.noreply.github.com>
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

common/common.cpp

@@ -51,6 +51,11 @@
 #include <unistd.h>
 #endif
 
+#if defined(__linux__)
+#include <sys/types.h>
+#include <pwd.h>
+#endif
+
 #if defined(_MSC_VER)
 #pragma warning(disable: 4244 4267) // possible loss of data
 #endif
@@ -865,8 +870,20 @@ std::string fs_get_cache_directory() {
 #if defined(__linux__) || defined(__FreeBSD__) || defined(_AIX) || defined(__OpenBSD__)
         if (std::getenv("XDG_CACHE_HOME")) {
             cache_directory = std::getenv("XDG_CACHE_HOME");
-        } else {
+        } else if (std::getenv("HOME")) {
             cache_directory = std::getenv("HOME") + std::string("/.cache/");
+        } else {
+#if defined(__linux__)
+            /* no $HOME is defined, fallback to getpwuid */
+            struct passwd *pw = getpwuid(getuid());
+            if ((!pw) || (!pw->pw_dir)) {
+                throw std::runtime_error("Failed to find $HOME directory");
+            }
+
+            cache_directory = std::string(pw->pw_dir) + std::string("/.cache/");
+#else /* defined(__linux__) */
+            throw std::runtime_error("Failed to find $HOME directory");
+#endif /* defined(__linux__) */
         }
 #elif defined(__APPLE__)
         cache_directory = std::getenv("HOME") + std::string("/Library/Caches/");