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authorSalyzyn, Mark <mark_salyzyn@adaptec.com>2007-12-13 19:14:18 -0500
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-01-11 19:28:07 -0500
commit94cf6ba11b068b8a8f68a1e88bffb6827e92124b (patch)
treec5ec05bb60248471ba9992c56dfeb1b44980d24b /drivers/scsi/aacraid/commsup.c
parent00f5970193e22c48f399a2430635d6416b51befe (diff)
[SCSI] aacraid: fix driver failure with Dell PowerEdge Expandable RAID Controller 3/Di
As reported in http://bugzilla.kernel.org/show_bug.cgi?id=3D9133 it was discovered that the PERC line of controllers lacked a key 64 bit ScatterGather capable SCSI pass-through function. The adapters are still capable of 64 bit ScatterGather I/O commands, but these two can not be mixed. This problem was exacerbated by the introduction of the SCSI Generic access to the DASD physical devices. The fix for users before this patch is applied is aacraid.dacmode=3D0 on the kernel command line to disable 64 bit I/O. The enclosed patch introduces a new adapter quirk and tries to limp along by enabling pass-through in situations where memory is 32 bit addressable on 64 bit machines, or disable the pass-through functions altogether. I expect that the check for 32 bit addressable memory to be controversial in that it can be incorrect in non-Dell non-Intel systems that PERC would never be installed under, the alternative is to disable pass-through in all cases which could be reported as another regression. Pass-through is used for SCSI Generic access to the physical devices, or for the management applications to properly function. In systems where this patch has disabled pass-through because it is unsupportable in combination with I/O performance, the user can choose to enable pass-through by turning off dacmode (aacraid.dacmode=3D0) or limiting the discovered kernel memory (mem=3D4G) with an associated loss in runtime performance. If we chose instead to turn off 64 bit dacmode for the adapters with this quirk, then this would be reported as another regression. Signed-off-by: Mark Salyzyn <aacraid@adaptec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/aacraid/commsup.c')
-rw-r--r--drivers/scsi/aacraid/commsup.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index 310fd80b8c06..53d415e812ee 100644
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -1099,7 +1099,8 @@ static int _aac_reset_adapter(struct aac_dev *aac, int forced)
1099 free_irq(aac->pdev->irq, aac); 1099 free_irq(aac->pdev->irq, aac);
1100 kfree(aac->fsa_dev); 1100 kfree(aac->fsa_dev);
1101 aac->fsa_dev = NULL; 1101 aac->fsa_dev = NULL;
1102 if (aac_get_driver_ident(index)->quirks & AAC_QUIRK_31BIT) { 1102 quirks = aac_get_driver_ident(index)->quirks;
1103 if (quirks & AAC_QUIRK_31BIT) {
1103 if (((retval = pci_set_dma_mask(aac->pdev, DMA_31BIT_MASK))) || 1104 if (((retval = pci_set_dma_mask(aac->pdev, DMA_31BIT_MASK))) ||
1104 ((retval = pci_set_consistent_dma_mask(aac->pdev, DMA_31BIT_MASK)))) 1105 ((retval = pci_set_consistent_dma_mask(aac->pdev, DMA_31BIT_MASK))))
1105 goto out; 1106 goto out;
@@ -1110,7 +1111,7 @@ static int _aac_reset_adapter(struct aac_dev *aac, int forced)
1110 } 1111 }
1111 if ((retval = (*(aac_get_driver_ident(index)->init))(aac))) 1112 if ((retval = (*(aac_get_driver_ident(index)->init))(aac)))
1112 goto out; 1113 goto out;
1113 if (aac_get_driver_ident(index)->quirks & AAC_QUIRK_31BIT) 1114 if (quirks & AAC_QUIRK_31BIT)
1114 if ((retval = pci_set_dma_mask(aac->pdev, DMA_32BIT_MASK))) 1115 if ((retval = pci_set_dma_mask(aac->pdev, DMA_32BIT_MASK)))
1115 goto out; 1116 goto out;
1116 if (jafo) { 1117 if (jafo) {
@@ -1121,7 +1122,6 @@ static int _aac_reset_adapter(struct aac_dev *aac, int forced)
1121 } 1122 }
1122 } 1123 }
1123 (void)aac_get_adapter_info(aac); 1124 (void)aac_get_adapter_info(aac);
1124 quirks = aac_get_driver_ident(index)->quirks;
1125 if ((quirks & AAC_QUIRK_34SG) && (host->sg_tablesize > 34)) { 1125 if ((quirks & AAC_QUIRK_34SG) && (host->sg_tablesize > 34)) {
1126 host->sg_tablesize = 34; 1126 host->sg_tablesize = 34;
1127 host->max_sectors = (host->sg_tablesize * 8) + 112; 1127 host->max_sectors = (host->sg_tablesize * 8) + 112;