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shm: page-align the memfd size (also needed for GPU direct import)

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Daniel Eklöf 2025-10-04 10:50:38 +02:00
parent fac3994154
commit bd994eda1c
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GPG key ID: 5BBD4992C116573F
1 changed files with 8 additions and 4 deletions
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12
shm.c
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@ -239,7 +239,6 @@ static const struct wl_buffer_listener buffer_listener = {
.release = &buffer_release,
};
#if __SIZEOF_POINTER__ == 8
static size_t
page_size(void)
{
@ -256,7 +255,6 @@ page_size(void)
xassert(size > 0);
return size;
}
#endif
static bool
instantiate_offset(struct buffer_private *buf, off_t new_offset)
@ -398,9 +396,11 @@ get_new_buffers(struct buffer_chain *chain, size_t count,
goto err;
}
const size_t page_sz = page_size();
#if __SIZEOF_POINTER__ == 8
off_t offset = chain->scrollable && max_pool_size > 0
? (max_pool_size / 4) & ~(page_size() - 1)
? (max_pool_size / 4) & ~(page_sz - 1)
: 0;
off_t memfd_size = chain->scrollable && max_pool_size > 0
? max_pool_size
@ -410,7 +410,8 @@ get_new_buffers(struct buffer_chain *chain, size_t count,
off_t memfd_size = total_size;
#endif
xassert(chain->scrollable || (offset == 0 && memfd_size == total_size));
/* Page align */
memfd_size = (memfd_size + page_sz - 1) & ~(page_sz - 1);
LOG_DBG("memfd-size: %lu, initial offset: %lu", memfd_size, offset);
@ -442,6 +443,9 @@ get_new_buffers(struct buffer_chain *chain, size_t count,
memfd_size = total_size;
chain->scrollable = false;
/* Page align */
memfd_size = (memfd_size + page_sz - 1) & ~(page_sz - 1);
if (ftruncate(pool_fd, memfd_size) < 0) {
LOG_ERRNO("failed to set size of SHM backing memory file");
goto err;