[Bug 106258] AMD Xorg start failes with non-4K page sizes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106258

--- Comment #30 from Michel Dänzer <michel at daenzer.net> ---
I suspect there's an issue in amdgpu_vm_bo_split_mapping, e.g. this code looks
suspicious:

                if (pages_addr) {
                        uint64_t count;

                        max_entries = min(max_entries, 16ull * 1024ull);
                        for (count = 1; count < max_entries; ++count) {
                                uint64_t idx = pfn + count;

                                if (pages_addr[idx] !=
                                    (pages_addr[idx - 1] + PAGE_SIZE))
                                        break;
                        }

count is compared to max_entries, which is a number of GPU pages, but is also
added to pfn, which is a number of CPU pages.

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