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Subject[PATCH 2/4] scsi: mpt3sas: try 64 bit DMA when 32 bit DMA fails
Date
Current code gives up when 32 bit DMA is not supported.
This patch tests 64 bit support before bailing out in
such conditions.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
drivers/scsi/mpt3sas/mpt3sas_base.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_base.c b/drivers/scsi/mpt3sas/mpt3sas_base.c
index d4f1dcd..6dc391c 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_base.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_base.c
@@ -1535,9 +1535,29 @@ _base_config_dma_addressing(struct MPT3SAS_ADAPTER *ioc, struct pci_dev *pdev)
ioc->base_add_sg_single = &_base_add_sg_single_32;
ioc->sge_size = sizeof(Mpi2SGESimple32_t);
ioc->dma_mask = 32;
- } else
+ } else {
+ /* Try 64 bit, 32 bit failed */
+ consistent_dma_mask = DMA_BIT_MASK(64);
+ if (sizeof(dma_addr_t) > 4) {
+ const uint64_t required_mask =
+ dma_get_required_mask(&pdev->dev);
+ int consistent_mask =
+ pci_set_consistent_dma_mask(pdev,
+ consistent_dma_mask);
+
+ if ((required_mask > DMA_BIT_MASK(32)) &&
+ !pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) &&
+ !consistent_mask) {
+ ioc->base_add_sg_single =
+ &_base_add_sg_single_64;
+ ioc->sge_size = sizeof(Mpi2SGESimple64_t);
+ ioc->dma_mask = 64;
+ goto out;
+ }
+ }
return -ENODEV;

+ }
out:
si_meminfo(&s);
pr_info(MPT3SAS_FMT
--
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project


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