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scsi: mpt3sas: Force reply post buffer allocations to be within same 4 GB region

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According to the MPI specification, reply post buffers can not cross a 4 GB
boundary.

While allocating, if any buffer crosses the 4 GB boundary, then:

 - Release the already allocated memory pools; and

 - Reallocate them by changing the DMA coherent mask to 32-bit

Link: https://lore.kernel.org/r/20210305102904.7560-6-suganath-prabu.subramani@broadcom.com
Signed-off-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Suganath Prabu S 2021-03-05 15:59:02 +05:30 committed by Martin K. Petersen
parent 58501fd937
commit 2e4e858732
1 changed files with 42 additions and 17 deletions
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59
drivers/scsi/mpt3sas/mpt3sas_base.c
View file

@ -5593,6 +5593,42 @@ _base_allocate_reply_pool(struct MPT3SAS_ADAPTER *ioc, u32 sz)
return 0;
}
/**
* _base_allocate_reply_free_dma_pool - Allocating DMA'able memory
* for reply free dma pool.
* @ioc: Adapter object
* @sz: DMA Pool size
* Return: 0 for success, non-zero for failure.
*/
static int
_base_allocate_reply_free_dma_pool(struct MPT3SAS_ADAPTER *ioc, u32 sz)
{
/* reply free queue, 16 byte align */
ioc->reply_free_dma_pool = dma_pool_create(
"reply_free pool", &ioc->pdev->dev, sz, 16, 0);
if (!ioc->reply_free_dma_pool)
return -ENOMEM;
ioc->reply_free = dma_pool_alloc(ioc->reply_free_dma_pool,
GFP_KERNEL, &ioc->reply_free_dma);
if (!ioc->reply_free)
return -EAGAIN;
if (!mpt3sas_check_same_4gb_region((long)ioc->reply_free, sz)) {
dinitprintk(ioc,
pr_err("Bad Reply Free Pool! Reply Free (0x%p) Reply Free dma = (0x%llx)\n",
ioc->reply_free, (unsigned long long) ioc->reply_free_dma));
ioc->use_32bit_dma = true;
return -EAGAIN;
}
memset(ioc->reply_free, 0, sz);
dinitprintk(ioc, ioc_info(ioc,
"reply_free pool(0x%p): depth(%d), element_size(%d), pool_size(%d kB)\n",
ioc->reply_free, ioc->reply_free_queue_depth, 4, sz/1024));
dinitprintk(ioc, ioc_info(ioc,
"reply_free_dma (0x%llx)\n",
(unsigned long long)ioc->reply_free_dma));
return 0;
}
/**
* base_alloc_rdpq_dma_pool - Allocating DMA'able memory
* for reply queues.
@ -6050,29 +6086,18 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
else if (rc == -EAGAIN)
goto try_32bit_dma;
total_sz += sz;
/* reply free queue, 16 byte align */
sz = ioc->reply_free_queue_depth * 4;
ioc->reply_free_dma_pool = dma_pool_create("reply_free pool",
&ioc->pdev->dev, sz, 16, 0);
if (!ioc->reply_free_dma_pool) {
ioc_err(ioc, "reply_free pool: dma_pool_create failed\n");
goto out;
}
ioc->reply_free = dma_pool_zalloc(ioc->reply_free_dma_pool, GFP_KERNEL,
&ioc->reply_free_dma);
if (!ioc->reply_free) {
ioc_err(ioc, "reply_free pool: dma_pool_alloc failed\n");
goto out;
}
dinitprintk(ioc,
ioc_info(ioc, "reply_free pool(0x%p): depth(%d), element_size(%d), pool_size(%d kB)\n",
ioc->reply_free, ioc->reply_free_queue_depth,
4, sz / 1024));
rc = _base_allocate_reply_free_dma_pool(ioc, sz);
if (rc == -ENOMEM)
return -ENOMEM;
else if (rc == -EAGAIN)
goto try_32bit_dma;
dinitprintk(ioc,
ioc_info(ioc, "reply_free_dma (0x%llx)\n",
(unsigned long long)ioc->reply_free_dma));
total_sz += sz;
if (ioc->rdpq_array_enable) {
reply_post_free_array_sz = ioc->reply_queue_count *
sizeof(Mpi2IOCInitRDPQArrayEntry);