diff options
| author | Oreoluwa Babatunde <oreoluwa.babatunde@oss.qualcomm.com> | 2026-01-26 18:13:27 +0100 |
|---|---|---|
| committer | Marek Szyprowski <m.szyprowski@samsung.com> | 2026-01-29 00:26:36 +0100 |
| commit | 0fd17e5983337231dc655e9ca0095d2ca3f47405 (patch) | |
| tree | 85b790559691c628981b458fc392d7ab1143e3c0 /include/linux | |
| parent | c6ccd098807483762ccd726e1498bac5a71d0005 (diff) | |
of: reserved_mem: Allow reserved_mem framework detect "cma=" kernel param
When initializing the default cma region, the "cma=" kernel parameter
takes priority over a DT defined linux,cma-default region. Hence, give
the reserved_mem framework the ability to detect this so that the DT
defined cma region can skip initialization accordingly.
Signed-off-by: Oreoluwa Babatunde <oreoluwa.babatunde@oss.qualcomm.com>
Tested-by: Joy Zou <joy.zou@nxp.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Fixes: 8a6e02d0c00e ("of: reserved_mem: Restructure how the reserved memory regions are processed")
Fixes: 2c223f7239f3 ("of: reserved_mem: Restructure call site for dma_contiguous_early_fixup()")
Link: https://lore.kernel.org/r/20251210002027.1171519-1-oreoluwa.babatunde@oss.qualcomm.com
[mszyprow: rebased onto v6.19-rc1, added fixes tags, added a stub for
cma_skip_dt_default_reserved_mem() if no CONFIG_DMA_CMA is set]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/cma.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/cma.h b/include/linux/cma.h index 62d9c1cf6326..2e6931735880 100644 --- a/include/linux/cma.h +++ b/include/linux/cma.h @@ -57,6 +57,15 @@ extern bool cma_intersects(struct cma *cma, unsigned long start, unsigned long e extern void cma_reserve_pages_on_error(struct cma *cma); +#ifdef CONFIG_DMA_CMA +extern bool cma_skip_dt_default_reserved_mem(void); +#else +static inline bool cma_skip_dt_default_reserved_mem(void) +{ + return false; +} +#endif + #ifdef CONFIG_CMA struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp); bool cma_free_folio(struct cma *cma, const struct folio *folio); |