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Subject[PATCH 4/7] dma-mapping: simplify dma_init_coherent_memory
Date
Return the allocated dma_coherent_mem structure, set the
use_dma_pfn_offset and print the failure warning inside of
dma_init_coherent_memory instead of leaving that to the callers.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Dillon Min <dillon.minfei@gmail.com>
---
kernel/dma/coherent.c | 78 ++++++++++++++++++-------------------------
1 file changed, 33 insertions(+), 45 deletions(-)

diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c
index 67b126afac5a..ab397ebfd5ad 100644
--- a/kernel/dma/coherent.c
+++ b/kernel/dma/coherent.c
@@ -37,51 +37,44 @@ static inline dma_addr_t dma_get_device_base(struct device *dev,
return mem->device_base;
}

-static int dma_init_coherent_memory(phys_addr_t phys_addr,
- dma_addr_t device_addr, size_t size,
- struct dma_coherent_mem **mem)
+static struct dma_coherent_mem *dma_init_coherent_memory(phys_addr_t phys_addr,
+ dma_addr_t device_addr, size_t size, bool use_dma_pfn_offset)
{
- struct dma_coherent_mem *dma_mem = NULL;
- void *mem_base = NULL;
+ struct dma_coherent_mem *dma_mem;
int pages = size >> PAGE_SHIFT;
int bitmap_size = BITS_TO_LONGS(pages) * sizeof(long);
- int ret;
+ void *mem_base;

- if (!size) {
- ret = -EINVAL;
- goto out;
- }
+ if (!size)
+ return ERR_PTR(-EINVAL);

mem_base = memremap(phys_addr, size, MEMREMAP_WC);
- if (!mem_base) {
- ret = -EINVAL;
- goto out;
- }
+ if (!mem_base)
+ return ERR_PTR(-EINVAL);
+
dma_mem = kzalloc(sizeof(struct dma_coherent_mem), GFP_KERNEL);
- if (!dma_mem) {
- ret = -ENOMEM;
- goto out;
- }
+ if (!dma_mem)
+ goto out_unmap_membase;
dma_mem->bitmap = kzalloc(bitmap_size, GFP_KERNEL);
- if (!dma_mem->bitmap) {
- ret = -ENOMEM;
- goto out;
- }
+ if (!dma_mem->bitmap)
+ goto out_free_dma_mem;

dma_mem->virt_base = mem_base;
dma_mem->device_base = device_addr;
dma_mem->pfn_base = PFN_DOWN(phys_addr);
dma_mem->size = pages;
+ dma_mem->use_dev_dma_pfn_offset = use_dma_pfn_offset;
spin_lock_init(&dma_mem->spinlock);

- *mem = dma_mem;
- return 0;
+ return dma_mem;

-out:
+out_free_dma_mem:
kfree(dma_mem);
- if (mem_base)
- memunmap(mem_base);
- return ret;
+out_unmap_membase:
+ memunmap(mem_base);
+ pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %zd MiB\n",
+ &phys_addr, size / SZ_1M);
+ return ERR_PTR(-ENOMEM);
}

static void dma_release_coherent_memory(struct dma_coherent_mem *mem)
@@ -130,9 +123,9 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
struct dma_coherent_mem *mem;
int ret;

- ret = dma_init_coherent_memory(phys_addr, device_addr, size, &mem);
- if (ret)
- return ret;
+ mem = dma_init_coherent_memory(phys_addr, device_addr, size, false);
+ if (IS_ERR(mem))
+ return PTR_ERR(mem);

ret = dma_assign_coherent_memory(dev, mem);
if (ret)
@@ -319,21 +312,16 @@ static struct reserved_mem *dma_reserved_default_memory __initdata;

static int rmem_dma_device_init(struct reserved_mem *rmem, struct device *dev)
{
- struct dma_coherent_mem *mem = rmem->priv;
- int ret;
-
- if (!mem) {
- ret = dma_init_coherent_memory(rmem->base, rmem->base,
- rmem->size, &mem);
- if (ret) {
- pr_err("Reserved memory: failed to init DMA memory pool at %pa, size %ld MiB\n",
- &rmem->base, (unsigned long)rmem->size / SZ_1M);
- return ret;
- }
+ if (!rmem->priv) {
+ struct dma_coherent_mem *mem;
+
+ mem = dma_init_coherent_memory(rmem->base, rmem->base,
+ rmem->size, true);
+ if (IS_ERR(mem))
+ return PTR_ERR(mem);
+ rmem->priv = mem;
}
- mem->use_dev_dma_pfn_offset = true;
- rmem->priv = mem;
- dma_assign_coherent_memory(dev, mem);
+ dma_assign_coherent_memory(dev, rmem->priv);
return 0;
}

--
2.30.2
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