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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2012 ARM Ltd. * Copyright (C) 2020 Google LLC */#include <linux/cma.h>#include <linux/debugfs.h>#include <linux/dma-map-ops.h>#include <linux/dma-direct.h>#include <linux/init.h>#include <linux/genalloc.h>#include <linux/set_memory.h>#include <linux/slab.h>#include <linux/workqueue.h>
static struct gen_pool *atomic_pool_dma __ro_after_init;static unsigned long pool_size_dma;static struct gen_pool *atomic_pool_dma32 __ro_after_init;static unsigned long pool_size_dma32;static struct gen_pool *atomic_pool_kernel __ro_after_init;static unsigned long pool_size_kernel;
/* Size can be defined by the coherent_pool command line */static size_t atomic_pool_size;
/* Dynamic background expansion when the atomic pool is near capacity */static struct work_struct atomic_pool_work;
static int __init early_coherent_pool(char *p){ atomic_pool_size = memparse(p, &p); return 0;}early_param("coherent_pool", early_coherent_pool);
static void __init dma_atomic_pool_debugfs_init(void){ struct dentry *root;
root = debugfs_create_dir("dma_pools", NULL); debugfs_create_ulong("pool_size_dma", 0400, root, &pool_size_dma); debugfs_create_ulong("pool_size_dma32", 0400, root, &pool_size_dma32); debugfs_create_ulong("pool_size_kernel", 0400, root, &pool_size_kernel);}
static void dma_atomic_pool_size_add(gfp_t gfp, size_t size){ if (gfp & __GFP_DMA) pool_size_dma += size; else if (gfp & __GFP_DMA32) pool_size_dma32 += size; else pool_size_kernel += size;}
static bool cma_in_zone(gfp_t gfp){ unsigned long size; phys_addr_t end; struct cma *cma;
cma = dev_get_cma_area(NULL); if (!cma) return false;
size = cma_get_size(cma); if (!size) return false;
/* CMA can't cross zone boundaries, see cma_activate_area() */ end = cma_get_base(cma) + size - 1; if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA)) return end <= zone_dma_limit; if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32)) return end <= max(DMA_BIT_MASK(32), zone_dma_limit); return true;}
static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size, gfp_t gfp){ unsigned int order; struct page *page = NULL; void *addr; int ret = -ENOMEM;
/* Cannot allocate larger than MAX_PAGE_ORDER */ order = min(get_order(pool_size), MAX_PAGE_ORDER);
do { pool_size = 1 << (PAGE_SHIFT + order); if (cma_in_zone(gfp)) page = dma_alloc_from_contiguous(NULL, 1 << order, order, false); if (!page) page = alloc_pages(gfp | __GFP_NOWARN, order); } while (!page && order-- > 0); if (!page) goto out;
arch_dma_prep_coherent(page, pool_size);
#ifdef CONFIG_DMA_DIRECT_REMAP addr = dma_common_contiguous_remap(page, pool_size, pgprot_decrypted(pgprot_dmacoherent(PAGE_KERNEL)), __builtin_return_address(0)); if (!addr) goto free_page;#else addr = page_to_virt(page);#endif /* * Memory in the atomic DMA pools must be unencrypted, the pools do not * shrink so no re-encryption occurs in dma_direct_free(). */ ret = set_memory_decrypted((unsigned long)page_to_virt(page), 1 << order); if (ret) goto remove_mapping; ret = gen_pool_add_virt(pool, (unsigned long)addr, page_to_phys(page), pool_size, NUMA_NO_NODE); if (ret) goto encrypt_mapping;
dma_atomic_pool_size_add(gfp, pool_size); return 0;
encrypt_mapping: ret = set_memory_encrypted((unsigned long)page_to_virt(page), 1 << order); if (WARN_ON_ONCE(ret)) { /* Decrypt succeeded but encrypt failed, purposely leak */ goto out; }remove_mapping:#ifdef CONFIG_DMA_DIRECT_REMAP dma_common_free_remap(addr, pool_size);free_page: __free_pages(page, order);#endifout: return ret;}
static void atomic_pool_resize(struct gen_pool *pool, gfp_t gfp){ if (pool && gen_pool_avail(pool) < atomic_pool_size) atomic_pool_expand(pool, gen_pool_size(pool), gfp);}
static void atomic_pool_work_fn(struct work_struct *work){ if (IS_ENABLED(CONFIG_ZONE_DMA)) atomic_pool_resize(atomic_pool_dma, GFP_KERNEL | GFP_DMA); if (IS_ENABLED(CONFIG_ZONE_DMA32)) atomic_pool_resize(atomic_pool_dma32, GFP_KERNEL | GFP_DMA32); atomic_pool_resize(atomic_pool_kernel, GFP_KERNEL);}
static __init struct gen_pool *__dma_atomic_pool_init(size_t pool_size, gfp_t gfp){ struct gen_pool *pool; int ret;
pool = gen_pool_create(PAGE_SHIFT, NUMA_NO_NODE); if (!pool) return NULL;
gen_pool_set_algo(pool, gen_pool_first_fit_order_align, NULL);
ret = atomic_pool_expand(pool, pool_size, gfp); if (ret) { gen_pool_destroy(pool); pr_err("DMA: failed to allocate %zu KiB %pGg pool for atomic allocation\n", pool_size >> 10, &gfp); return NULL; }
pr_info("DMA: preallocated %zu KiB %pGg pool for atomic allocations\n", gen_pool_size(pool) >> 10, &gfp); return pool;}
#ifdef CONFIG_ZONE_DMA32#define has_managed_dma32 has_managed_zone(ZONE_DMA32)#else#define has_managed_dma32 false#endif
static int __init dma_atomic_pool_init(void){ int ret = 0;
/* * If coherent_pool was not used on the command line, default the pool * sizes to 128KB per 1GB of memory, min 128KB, max MAX_PAGE_ORDER. */ if (!atomic_pool_size) { unsigned long pages = totalram_pages() / (SZ_1G / SZ_128K); pages = min_t(unsigned long, pages, MAX_ORDER_NR_PAGES); atomic_pool_size = max_t(size_t, pages << PAGE_SHIFT, SZ_128K); } INIT_WORK(&atomic_pool_work, atomic_pool_work_fn);
/* All memory might be in the DMA zone(s) to begin with */ if (has_managed_zone(ZONE_NORMAL)) { atomic_pool_kernel = __dma_atomic_pool_init(atomic_pool_size, GFP_KERNEL); if (!atomic_pool_kernel) ret = -ENOMEM; } if (has_managed_dma()) { atomic_pool_dma = __dma_atomic_pool_init(atomic_pool_size, GFP_KERNEL | GFP_DMA); if (!atomic_pool_dma) ret = -ENOMEM; } if (has_managed_dma32) { atomic_pool_dma32 = __dma_atomic_pool_init(atomic_pool_size, GFP_KERNEL | GFP_DMA32); if (!atomic_pool_dma32) ret = -ENOMEM; }
dma_atomic_pool_debugfs_init(); return ret;}postcore_initcall(dma_atomic_pool_init);
static inline struct gen_pool *dma_guess_pool(struct gen_pool *prev, gfp_t gfp){ if (prev == NULL) { if (gfp & GFP_DMA) return atomic_pool_dma ?: atomic_pool_dma32 ?: atomic_pool_kernel; if (gfp & GFP_DMA32) return atomic_pool_dma32 ?: atomic_pool_dma ?: atomic_pool_kernel; return atomic_pool_kernel ?: atomic_pool_dma32 ?: atomic_pool_dma; } if (prev == atomic_pool_kernel) return atomic_pool_dma32 ? atomic_pool_dma32 : atomic_pool_dma; if (prev == atomic_pool_dma32) return atomic_pool_dma; return NULL;}
static struct page *__dma_alloc_from_pool(struct device *dev, size_t size, struct gen_pool *pool, void **cpu_addr, bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t)){ unsigned long addr; phys_addr_t phys;
addr = gen_pool_alloc(pool, size); if (!addr) return NULL;
phys = gen_pool_virt_to_phys(pool, addr); if (phys_addr_ok && !phys_addr_ok(dev, phys, size)) { gen_pool_free(pool, addr, size); return NULL; }
if (gen_pool_avail(pool) < atomic_pool_size) schedule_work(&atomic_pool_work);
*cpu_addr = (void *)addr; memset(*cpu_addr, 0, size); return pfn_to_page(__phys_to_pfn(phys));}
struct page *dma_alloc_from_pool(struct device *dev, size_t size, void **cpu_addr, gfp_t gfp, bool (*phys_addr_ok)(struct device *, phys_addr_t, size_t)){ struct gen_pool *pool = NULL; struct page *page; bool pool_found = false;
while ((pool = dma_guess_pool(pool, gfp))) { pool_found = true; page = __dma_alloc_from_pool(dev, size, pool, cpu_addr, phys_addr_ok); if (page) return page; }
if (pool_found) WARN(!(gfp & __GFP_NOWARN), "DMA pool exhausted for %s\n", dev_name(dev)); else WARN(1, "Failed to get suitable pool for %s\n", dev_name(dev)); return NULL;}
bool dma_free_from_pool(struct device *dev, void *start, size_t size){ struct gen_pool *pool = NULL;
while ((pool = dma_guess_pool(pool, 0))) { if (!gen_pool_has_addr(pool, (unsigned long)start, size)) continue; gen_pool_free(pool, (unsigned long)start, size); return true; }
return false;}