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crypto: crypto4xx - reduce memory fragmentation 

With recent kernels (>5.2), the driver fails to probe, as the
allocation of the driver's scatter buffer fails with -ENOMEM.

This happens in crypto4xx_build_sdr(). Where the driver tries
to get 512KiB (=PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD) of
continuous memory. This big chunk is by design, since the driver
uses this circumstance in the crypto4xx_copy_pkt_to_dst() to
its advantage:
"all scatter-buffers are all neatly organized in one big
continuous ringbuffer; So scatterwalk_map_and_copy() can be
instructed to copy a range of buffers in one go."

The PowerPC arch does not have support for DMA_CMA. Hence,
this patch reorganizes the order in which the memory
allocations are done. Since the driver itself is responsible
for some of the issues.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Christian Lamparter 2020-01-01 23:27:01 +01:00 committed by Herbert Xu
parent af5034e8e4
commit b87b2c4d91
1 changed files with 13 additions and 14 deletions
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27
drivers/crypto/amcc/crypto4xx_core.c
View File

@ -286,7 +286,8 @@ static u32 crypto4xx_build_gdr(struct crypto4xx_device *dev)
static inline void crypto4xx_destroy_gdr(struct crypto4xx_device *dev)
{
dma_free_coherent(dev->core_dev->device,
if (dev->gdr)
dma_free_coherent(dev->core_dev->device,
sizeof(struct ce_gd) * PPC4XX_NUM_GD,
dev->gdr, dev->gdr_pa);
}
@ -354,13 +355,6 @@ static u32 crypto4xx_build_sdr(struct crypto4xx_device *dev)
{
int i;
/* alloc memory for scatter descriptor ring */
dev->sdr = dma_alloc_coherent(dev->core_dev->device,
sizeof(struct ce_sd) * PPC4XX_NUM_SD,
&dev->sdr_pa, GFP_ATOMIC);
if (!dev->sdr)
return -ENOMEM;
dev->scatter_buffer_va =
dma_alloc_coherent(dev->core_dev->device,
PPC4XX_SD_BUFFER_SIZE * PPC4XX_NUM_SD,
@ -368,6 +362,13 @@ static u32 crypto4xx_build_sdr(struct crypto4xx_device *dev)
if (!dev->scatter_buffer_va)
return -ENOMEM;
/* alloc memory for scatter descriptor ring */
dev->sdr = dma_alloc_coherent(dev->core_dev->device,
sizeof(struct ce_sd) * PPC4XX_NUM_SD,
&dev->sdr_pa, GFP_ATOMIC);
if (!dev->sdr)
return -ENOMEM;
for (i = 0; i < PPC4XX_NUM_SD; i++) {
dev->sdr[i].ptr = dev->scatter_buffer_pa +
PPC4XX_SD_BUFFER_SIZE * i;
@ -1439,15 +1440,14 @@ static int crypto4xx_probe(struct platform_device *ofdev)
spin_lock_init(&core_dev->lock);
INIT_LIST_HEAD(&core_dev->dev->alg_list);
ratelimit_default_init(&core_dev->dev->aead_ratelimit);
rc = crypto4xx_build_sdr(core_dev->dev);
if (rc)
goto err_build_sdr;
rc = crypto4xx_build_pdr(core_dev->dev);
if (rc)
goto err_build_pdr;
goto err_build_sdr;
rc = crypto4xx_build_gdr(core_dev->dev);
if (rc)
goto err_build_pdr;
rc = crypto4xx_build_sdr(core_dev->dev);
if (rc)
goto err_build_sdr;
@ -1493,7 +1493,6 @@ err_iomap:
err_build_sdr:
crypto4xx_destroy_sdr(core_dev->dev);
crypto4xx_destroy_gdr(core_dev->dev);
err_build_pdr:
crypto4xx_destroy_pdr(core_dev->dev);
kfree(core_dev->dev);
err_alloc_dev: