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ANDROID: dma-contiguous: Add tracehook to allow subpage allocations in dma_alloc_contiguous

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Add a tracehook to allow callers into dma_alloc_contiguous() to make
use of the built-in CMA area if the caller has addressing limitations;
this provides a means of allocating from memory whose bounds are
restricted to the lower 4 GB of memory, without having to enable DMA32
(assuming the default CMA area has been restricted to the appropriate
address ranges).

Leaf changes summary: 1 artifact changed
Changed leaf types summary: 0 leaf type changed
Removed/Changed/Added functions summary: 0 Removed, 0 Changed, 0 Added function
Removed/Changed/Added variables summary: 0 Removed, 0 Changed, 1 Added variable

1 Added variable:

  [A] 'tracepoint __tracepoint_android_vh_subpage_dma_contig_alloc'

Bug: 199917449
Change-Id: Ia86fb416376bca231405b06ab27b0674c8fe3e14
Signed-off-by: Chris Goldsworthy <quic_cgoldswo@quicinc.com>
This commit is contained in:
Chris Goldsworthy
2021-12-09 14:47:35 -08:00
parent d94655c43e
commit 84fc3abca0
5 changed files with 74 additions and 60 deletions
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4
include/trace/hooks/mm.h
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@@ -126,6 +126,10 @@ DECLARE_HOOK(android_vh_mmap_region,
DECLARE_HOOK(android_vh_try_to_unmap_one,
TP_PROTO(struct vm_area_struct *vma, struct page *page, unsigned long addr, bool ret),
TP_ARGS(vma, page, addr, ret));
struct device;
DECLARE_HOOK(android_vh_subpage_dma_contig_alloc,
TP_PROTO(bool *allow_subpage_alloc, struct device *dev, size_t *size),
TP_ARGS(allow_subpage_alloc, dev, size));
/* macro versions of hooks are no longer required */
#endif /* _TRACE_HOOK_MM_H */