[lkml]   [2015]   [Mar]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 1/8] pmem: Initial version of persistent memory driver
On Mar 5, 2015 3:55 AM, "Boaz Harrosh" <> wrote:
> From: Ross Zwisler <>
> PMEM is a new driver That supports any physical contiguous iomem range
> as a single block device. The driver has support for as many as needed
> iomem ranges each as its own device.
> The driver is not only good for NvDIMMs, It is good for any flat memory
> mapped device. We've used it with NvDIMMs, Kernel reserved DRAM
> (memmap= on command line), PCIE Battery backed memory cards, VM shared
> memory, and so on.
> The API to pmem module a single string parameter named "map"
> of the form:
> map=mapS[,mapS...]
> where mapS=nn[KMG]$ss[KMG],
> or mapS=nn[KMG]@ss[KMG],
> nn=size, ss=offset
> Just like the Kernel command line map && memmap parameters,
> so anything you did at grub just copy/paste to here.
> The "@" form is exactly the same as the "$" form only that
> at bash prompt we need to escape the "$" with \$ so also
> support the '@' char for convenience.
> For each specified mapS there will be a device created.


> + pmem->virt_addr = ioremap_cache(pmem->phys_addr, pmem->size);

I think it would be nice to have control over the caching mode.
Depending on the application, WT or UC could make more sense.


 \ /
  Last update: 2015-03-06 00:21    [W:0.139 / U:0.172 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site