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-rw-r--r--drivers/iommu/dma-iommu.c5
-rw-r--r--include/linux/dma-direct.h2
-rw-r--r--include/linux/dma-mapping.h6
-rw-r--r--kernel/dma/direct.c12
-rw-r--r--kernel/dma/pool.c120
5 files changed, 91 insertions, 54 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index ba128d1cdaee..4959f5df21bd 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -952,7 +952,7 @@ static void __iommu_dma_free(struct device *dev, size_t size, void *cpu_addr)
/* Non-coherent atomic allocation? Easy */
if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
- dma_free_from_pool(cpu_addr, alloc_size))
+ dma_free_from_pool(dev, cpu_addr, alloc_size))
return;
if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) {
@@ -1035,7 +1035,8 @@ static void *iommu_dma_alloc(struct device *dev, size_t size,
if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
!gfpflags_allow_blocking(gfp) && !coherent)
- cpu_addr = dma_alloc_from_pool(PAGE_ALIGN(size), &page, gfp);
+ cpu_addr = dma_alloc_from_pool(dev, PAGE_ALIGN(size), &page,
+ gfp);
else
cpu_addr = iommu_dma_alloc_pages(dev, size, &page, gfp, attrs);
if (!cpu_addr)
diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 24b8684aa21d..136f984df0d9 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -67,6 +67,8 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size,
}
u64 dma_direct_get_required_mask(struct device *dev);
+gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
+ u64 *phys_mask);
void *dma_direct_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t gfp, unsigned long attrs);
void dma_direct_free(struct device *dev, size_t size, void *cpu_addr,
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 330ad58fbf4d..b43116a6405d 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -630,9 +630,9 @@ void *dma_common_pages_remap(struct page **pages, size_t size,
pgprot_t prot, const void *caller);
void dma_common_free_remap(void *cpu_addr, size_t size);
-bool dma_in_atomic_pool(void *start, size_t size);
-void *dma_alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags);
-bool dma_free_from_pool(void *start, size_t size);
+void *dma_alloc_from_pool(struct device *dev, size_t size,
+ struct page **ret_page, gfp_t flags);
+bool dma_free_from_pool(struct device *dev, void *start, size_t size);
int
dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr,
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 8f4bbdaf965e..a834ee22f8ff 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -45,8 +45,8 @@ u64 dma_direct_get_required_mask(struct device *dev)
return (1ULL << (fls64(max_dma) - 1)) * 2 - 1;
}
-static gfp_t __dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
- u64 *phys_limit)
+gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask,
+ u64 *phys_limit)
{
u64 dma_limit = min_not_zero(dma_mask, dev->bus_dma_limit);
@@ -89,8 +89,8 @@ struct page *__dma_direct_alloc_pages(struct device *dev, size_t size,
/* we always manually zero the memory once we are done: */
gfp &= ~__GFP_ZERO;
- gfp |= __dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
- &phys_limit);
+ gfp |= dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
+ &phys_limit);
page = dma_alloc_contiguous(dev, alloc_size, gfp);
if (page && !dma_coherent_ok(dev, page_to_phys(page), size)) {
dma_free_contiguous(dev, page, alloc_size);
@@ -128,7 +128,7 @@ void *dma_direct_alloc_pages(struct device *dev, size_t size,
if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
dma_alloc_need_uncached(dev, attrs) &&
!gfpflags_allow_blocking(gfp)) {
- ret = dma_alloc_from_pool(PAGE_ALIGN(size), &page, gfp);
+ ret = dma_alloc_from_pool(dev, PAGE_ALIGN(size), &page, gfp);
if (!ret)
return NULL;
goto done;
@@ -212,7 +212,7 @@ void dma_direct_free_pages(struct device *dev, size_t size, void *cpu_addr,
}
if (IS_ENABLED(CONFIG_DMA_DIRECT_REMAP) &&
- dma_free_from_pool(cpu_addr, PAGE_ALIGN(size)))
+ dma_free_from_pool(dev, cpu_addr, PAGE_ALIGN(size)))
return;
if (force_dma_unencrypted(dev))
diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
index 3df5d9d39922..db4f89ac5f5f 100644
--- a/kernel/dma/pool.c
+++ b/kernel/dma/pool.c
@@ -10,7 +10,9 @@
#include <linux/genalloc.h>
#include <linux/slab.h>
-static struct gen_pool *atomic_pool __ro_after_init;
+static struct gen_pool *atomic_pool_dma __ro_after_init;
+static struct gen_pool *atomic_pool_dma32 __ro_after_init;
+static struct gen_pool *atomic_pool_kernel __ro_after_init;
#define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K
static size_t atomic_pool_size __initdata = DEFAULT_DMA_COHERENT_POOL_SIZE;
@@ -22,89 +24,119 @@ static int __init early_coherent_pool(char *p)
}
early_param("coherent_pool", early_coherent_pool);
-static gfp_t dma_atomic_pool_gfp(void)
+static int __init __dma_atomic_pool_init(struct gen_pool **pool,
+ size_t pool_size, gfp_t gfp)
{
- if (IS_ENABLED(CONFIG_ZONE_DMA))
- return GFP_DMA;
- if (IS_ENABLED(CONFIG_ZONE_DMA32))
- return GFP_DMA32;
- return GFP_KERNEL;
-}
-
-static int __init dma_atomic_pool_init(void)
-{
- unsigned int pool_size_order = get_order(atomic_pool_size);
- unsigned long nr_pages = atomic_pool_size >> PAGE_SHIFT;
+ const unsigned int order = get_order(pool_size);
+ const unsigned long nr_pages = pool_size >> PAGE_SHIFT;
struct page *page;
void *addr;
int ret;
if (dev_get_cma_area(NULL))
- page = dma_alloc_from_contiguous(NULL, nr_pages,
- pool_size_order, false);
+ page = dma_alloc_from_contiguous(NULL, nr_pages, order, false);
else
- page = alloc_pages(dma_atomic_pool_gfp(), pool_size_order);
+ page = alloc_pages(gfp, order);
if (!page)
goto out;
- arch_dma_prep_coherent(page, atomic_pool_size);
+ arch_dma_prep_coherent(page, pool_size);
- atomic_pool = gen_pool_create(PAGE_SHIFT, -1);
- if (!atomic_pool)
+ *pool = gen_pool_create(PAGE_SHIFT, -1);
+ if (!*pool)
goto free_page;
- addr = dma_common_contiguous_remap(page, atomic_pool_size,
+ addr = dma_common_contiguous_remap(page, pool_size,
pgprot_dmacoherent(PAGE_KERNEL),
__builtin_return_address(0));
if (!addr)
goto destroy_genpool;
- ret = gen_pool_add_virt(atomic_pool, (unsigned long)addr,
- page_to_phys(page), atomic_pool_size, -1);
+ ret = gen_pool_add_virt(*pool, (unsigned long)addr, page_to_phys(page),
+ pool_size, -1);
if (ret)
goto remove_mapping;
- gen_pool_set_algo(atomic_pool, gen_pool_first_fit_order_align, NULL);
+ gen_pool_set_algo(*pool, gen_pool_first_fit_order_align, NULL);
- pr_info("DMA: preallocated %zu KiB pool for atomic allocations\n",
- atomic_pool_size / 1024);
+ pr_info("DMA: preallocated %zu KiB %pGg pool for atomic allocations\n",
+ pool_size >> 10, &gfp);
return 0;
remove_mapping:
- dma_common_free_remap(addr, atomic_pool_size);
+ dma_common_free_remap(addr, pool_size);
destroy_genpool:
- gen_pool_destroy(atomic_pool);
- atomic_pool = NULL;
+ gen_pool_destroy(*pool);
+ *pool = NULL;
free_page:
if (!dma_release_from_contiguous(NULL, page, nr_pages))
- __free_pages(page, pool_size_order);
+ __free_pages(page, order);
out:
- pr_err("DMA: failed to allocate %zu KiB pool for atomic coherent allocation\n",
- atomic_pool_size / 1024);
+ pr_err("DMA: failed to allocate %zu KiB %pGg pool for atomic allocation\n",
+ pool_size >> 10, &gfp);
return -ENOMEM;
}
+
+static int __init dma_atomic_pool_init(void)
+{
+ int ret = 0;
+ int err;
+
+ ret = __dma_atomic_pool_init(&atomic_pool_kernel, atomic_pool_size,
+ GFP_KERNEL);
+ if (IS_ENABLED(CONFIG_ZONE_DMA)) {
+ err = __dma_atomic_pool_init(&atomic_pool_dma,
+ atomic_pool_size, GFP_DMA);
+ if (!ret && err)
+ ret = err;
+ }
+ if (IS_ENABLED(CONFIG_ZONE_DMA32)) {
+ err = __dma_atomic_pool_init(&atomic_pool_dma32,
+ atomic_pool_size, GFP_DMA32);
+ if (!ret && err)
+ ret = err;
+ }
+ return ret;
+}
postcore_initcall(dma_atomic_pool_init);
-bool dma_in_atomic_pool(void *start, size_t size)
+static inline struct gen_pool *dev_to_pool(struct device *dev)
{
- if (unlikely(!atomic_pool))
- return false;
+ u64 phys_mask;
+ gfp_t gfp;
+
+ gfp = dma_direct_optimal_gfp_mask(dev, dev->coherent_dma_mask,
+ &phys_mask);
+ if (IS_ENABLED(CONFIG_ZONE_DMA) && gfp == GFP_DMA)
+ return atomic_pool_dma;
+ if (IS_ENABLED(CONFIG_ZONE_DMA32) && gfp == GFP_DMA32)
+ return atomic_pool_dma32;
+ return atomic_pool_kernel;
+}
- return gen_pool_has_addr(atomic_pool, (unsigned long)start, size);
+static bool dma_in_atomic_pool(struct device *dev, void *start, size_t size)
+{
+ struct gen_pool *pool = dev_to_pool(dev);
+
+ if (unlikely(!pool))
+ return false;
+ return gen_pool_has_addr(pool, (unsigned long)start, size);
}
-void *dma_alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags)
+void *dma_alloc_from_pool(struct device *dev, size_t size,
+ struct page **ret_page, gfp_t flags)
{
+ struct gen_pool *pool = dev_to_pool(dev);
unsigned long val;
void *ptr = NULL;
- if (!atomic_pool) {
- WARN(1, "coherent pool not initialised!\n");
+ if (!pool) {
+ WARN(1, "%pGg atomic pool not initialised!\n", &flags);
return NULL;
}
- val = gen_pool_alloc(atomic_pool, size);
+ val = gen_pool_alloc(pool, size);
if (val) {
- phys_addr_t phys = gen_pool_virt_to_phys(atomic_pool, val);
+ phys_addr_t phys = gen_pool_virt_to_phys(pool, val);
*ret_page = pfn_to_page(__phys_to_pfn(phys));
ptr = (void *)val;
@@ -114,10 +146,12 @@ void *dma_alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags)
return ptr;
}
-bool dma_free_from_pool(void *start, size_t size)
+bool dma_free_from_pool(struct device *dev, void *start, size_t size)
{
- if (!dma_in_atomic_pool(start, size))
+ struct gen_pool *pool = dev_to_pool(dev);
+
+ if (!dma_in_atomic_pool(dev, start, size))
return false;
- gen_pool_free(atomic_pool, (unsigned long)start, size);
+ gen_pool_free(pool, (unsigned long)start, size);
return true;
}
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.