From 2e4e8587327b37431e3205d09f541420d9d19266 Mon Sep 17 00:00:00 2001 From: Suganath Prabu S Date: Fri, 5 Mar 2021 15:59:02 +0530 Subject: scsi: mpt3sas: Force reply post buffer allocations to be within same 4 GB region 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 Signed-off-by: Martin K. Petersen --- drivers/scsi/mpt3sas/mpt3sas_base.c | 59 ++++++++++++++++++++++++++----------- 1 file changed, 42 insertions(+), 17 deletions(-) (limited to 'drivers/scsi/mpt3sas') diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c index 2aedc7e82381..5a1783aba4a6 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_base.c +++ b/drivers/scsi/mpt3sas/mpt3sas_base.c @@ -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); -- cgit v1.2.3