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0fd17e5983
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:8a6e02d0c0("of: reserved_mem: Restructure how the reserved memory regions are processed") Fixes:2c223f7239("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>
90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __CMA_H__
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#define __CMA_H__
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/numa.h>
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#ifdef CONFIG_CMA_AREAS
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#define MAX_CMA_AREAS CONFIG_CMA_AREAS
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#endif
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#define CMA_MAX_NAME 64
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/*
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* the buddy -- especially pageblock merging and alloc_contig_range()
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* -- can deal with only some pageblocks of a higher-order page being
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* MIGRATE_CMA, we can use pageblock_nr_pages.
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*/
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#define CMA_MIN_ALIGNMENT_PAGES pageblock_nr_pages
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#define CMA_MIN_ALIGNMENT_BYTES (PAGE_SIZE * CMA_MIN_ALIGNMENT_PAGES)
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struct cma;
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extern unsigned long totalcma_pages;
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extern phys_addr_t cma_get_base(const struct cma *cma);
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extern unsigned long cma_get_size(const struct cma *cma);
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extern const char *cma_get_name(const struct cma *cma);
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extern int __init cma_declare_contiguous_nid(phys_addr_t base,
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phys_addr_t size, phys_addr_t limit,
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phys_addr_t alignment, unsigned int order_per_bit,
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bool fixed, const char *name, struct cma **res_cma,
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int nid);
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static inline int __init cma_declare_contiguous(phys_addr_t base,
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phys_addr_t size, phys_addr_t limit,
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phys_addr_t alignment, unsigned int order_per_bit,
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bool fixed, const char *name, struct cma **res_cma)
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{
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return cma_declare_contiguous_nid(base, size, limit, alignment,
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order_per_bit, fixed, name, res_cma, NUMA_NO_NODE);
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}
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extern int __init cma_declare_contiguous_multi(phys_addr_t size,
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phys_addr_t align, unsigned int order_per_bit,
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const char *name, struct cma **res_cma, int nid);
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extern int cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
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unsigned int order_per_bit,
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const char *name,
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struct cma **res_cma);
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extern struct page *cma_alloc(struct cma *cma, unsigned long count, unsigned int align,
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bool no_warn);
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extern bool cma_pages_valid(struct cma *cma, const struct page *pages, unsigned long count);
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extern bool cma_release(struct cma *cma, const struct page *pages, unsigned long count);
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extern int cma_for_each_area(int (*it)(struct cma *cma, void *data), void *data);
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extern bool cma_intersects(struct cma *cma, unsigned long start, unsigned long end);
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extern void cma_reserve_pages_on_error(struct cma *cma);
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#ifdef CONFIG_DMA_CMA
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extern bool cma_skip_dt_default_reserved_mem(void);
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#else
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static inline bool cma_skip_dt_default_reserved_mem(void)
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{
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return false;
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}
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#endif
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#ifdef CONFIG_CMA
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struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp);
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bool cma_free_folio(struct cma *cma, const struct folio *folio);
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bool cma_validate_zones(struct cma *cma);
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#else
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static inline struct folio *cma_alloc_folio(struct cma *cma, int order, gfp_t gfp)
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{
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return NULL;
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}
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static inline bool cma_free_folio(struct cma *cma, const struct folio *folio)
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{
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return false;
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}
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static inline bool cma_validate_zones(struct cma *cma)
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{
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return false;
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}
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#endif
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#endif
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