Dear Arjan van de Ven,
The following contex is coming from comment of Christoph Hellwig.
- msi should be a module options if at all, but defintitly not
a config options
#ifdef CONFIG_SCSI_ARCMSR_MSI
if (!pci_enable_msi(pci_device))
pACB->acb_flags |= ACB_F_HAVE_MSI;
#endif
I make an option config for prevent some mainboards hang up if arcmsr enable
msi function.
Areca RAID controller is bridged hardware.
There were a lots of mainboards had wrong IRQ routing table issue with it.
If somebody meet this issue and people can enable msi function to fix its
hardware bug.
But unfortunately I found some mainboards will hang up if I always enable
this function in my lab.
To avoid this issue, I do an option for this case.
But Christoph Hellwig give me comment with it.
Best Regards
Erich Chen
----- Original Message -----
From: "Arjan van de Ven" <arjan@xxxxxxxxxxxxx>
To: "erich" <erich@xxxxxxxxxxxx>
Cc: "Christoph Hellwig" <hch@xxxxxxxxxxxxx>; <linux-scsi@xxxxxxxxxxxxxxx>;
<linux-kernel@xxxxxxxxxxxxxxx>; <billion.wu@xxxxxxxxxxxx>;
<alan@xxxxxxxxxxxxxxxxxxx>; <akpm@xxxxxxxx>; <oliver@xxxxxxxxxx>
Sent: Thursday, February 23, 2006 4:25 PM
Subject: Re: Areca RAID driver remaining items?
On Thu, 2006-02-23 at 14:27 +0800, erich wrote:
Dear Christoph Hellwig,
I have figure out your comments about "remove internal queueing" and
"remove
odd ioctl".
But about "hardware datastructures", areca's firmware spec is need to get
a
trunk of contingous memory space under 4G.
In 64bit platform arcmsr need to make sure all ccbs have same of
ccb_phyaddr_hi32 physical address.
If arcmsr use dma_pool_alloc do a separate dma mapping.
Is there any method to avoid ccbs pool cross 4G segment?
the pci mapping layer prevents that already entirely; there is a LOT of
hardware that cannot deal with segments crossing 4G boundaries, so much
in fact that it's now generically disabled.
In some mainboard if I always enable msi function, it will cause system
hang
up.
If it is not a config option, do you have any idea to avoid this issue?
how about a module option (module_param)?
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