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

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According to the MPI specification, chain 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/20210305102904.7560-3-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 15:58:59 +05:30 committed by Martin K. Petersen
parent d6adc251dd
commit 7dd847dae1
1 changed files with 57 additions and 26 deletions
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77
drivers/scsi/mpt3sas/mpt3sas_base.c
View File

@ -5480,6 +5480,52 @@ _base_allocate_pcie_sgl_pool(struct MPT3SAS_ADAPTER *ioc, u32 sz)
return 0;
}
/**
* _base_allocate_chain_dma_pool - Allocating DMA'able memory
* for chain dma pool.
* @ioc: Adapter object
* @sz: DMA Pool size
* @ctr: Chain tracker
* Return: 0 for success, non-zero for failure.
*/
static int
_base_allocate_chain_dma_pool(struct MPT3SAS_ADAPTER *ioc, u32 sz)
{
int i = 0, j = 0;
struct chain_tracker *ctr;
ioc->chain_dma_pool = dma_pool_create("chain pool", &ioc->pdev->dev,
ioc->chain_segment_sz, 16, 0);
if (!ioc->chain_dma_pool)
return -ENOMEM;
for (i = 0; i < ioc->scsiio_depth; i++) {
for (j = ioc->chains_per_prp_buffer;
j < ioc->chains_needed_per_io; j++) {
ctr = &ioc->chain_lookup[i].chains_per_smid[j];
ctr->chain_buffer = dma_pool_alloc(ioc->chain_dma_pool,
GFP_KERNEL, &ctr->chain_buffer_dma);
if (!ctr->chain_buffer)
return -EAGAIN;
if (!mpt3sas_check_same_4gb_region((long)
ctr->chain_buffer, ioc->chain_segment_sz)) {
ioc_err(ioc,
"Chain buffers are not in same 4G !!! Chain buff (0x%p) dma = (0x%llx)\n",
ctr->chain_buffer,
(unsigned long long)ctr->chain_buffer_dma);
ioc->use_32bit_dma = true;
return -EAGAIN;
}
}
}
dinitprintk(ioc, ioc_info(ioc,
"chain_lookup depth (%d), frame_size(%d), pool_size(%d kB)\n",
ioc->scsiio_depth, ioc->chain_segment_sz, ((ioc->scsiio_depth *
(ioc->chains_needed_per_io - ioc->chains_per_prp_buffer) *
ioc->chain_segment_sz))/1024));
return 0;
}
/**
* base_alloc_rdpq_dma_pool - Allocating DMA'able memory
* for reply queues.
@ -5577,9 +5623,8 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
u16 max_request_credit, nvme_blocks_needed;
unsigned short sg_tablesize;
u16 sge_size;
int i, j;
int i;
int ret = 0, rc = 0;
struct chain_tracker *ct;
dinitprintk(ioc, ioc_info(ioc, "%s\n", __func__));
@ -5906,27 +5951,13 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
total_sz += sz * ioc->scsiio_depth;
}
ioc->chain_dma_pool = dma_pool_create("chain pool", &ioc->pdev->dev,
ioc->chain_segment_sz, 16, 0);
if (!ioc->chain_dma_pool) {
ioc_err(ioc, "chain_dma_pool: dma_pool_create failed\n");
goto out;
}
for (i = 0; i < ioc->scsiio_depth; i++) {
for (j = ioc->chains_per_prp_buffer;
j < ioc->chains_needed_per_io; j++) {
ct = &ioc->chain_lookup[i].chains_per_smid[j];
ct->chain_buffer = dma_pool_alloc(
ioc->chain_dma_pool, GFP_KERNEL,
&ct->chain_buffer_dma);
if (!ct->chain_buffer) {
ioc_err(ioc, "chain_lookup: pci_pool_alloc failed\n");
goto out;
}
}
total_sz += ioc->chain_segment_sz;
}
rc = _base_allocate_chain_dma_pool(ioc, ioc->chain_segment_sz);
if (rc == -ENOMEM)
return -ENOMEM;
else if (rc == -EAGAIN)
goto try_32bit_dma;
total_sz += ioc->chain_segment_sz * ((ioc->chains_needed_per_io -
ioc->chains_per_prp_buffer) * ioc->scsiio_depth);
dinitprintk(ioc,
ioc_info(ioc, "chain pool depth(%d), frame_size(%d), pool_size(%d kB)\n",
ioc->chain_depth, ioc->chain_segment_sz,