Am Fr, den 15.10.2004 schrieb Vladimir Dergachev um 5:27:
On Fri, 15 Oct 2004, Felix [ISO-8859-1] Kühling wrote:
Am Fr, den 15.10.2004 schrieb Jon Smirl um 3:58:
On Fri, 15 Oct 2004 03:55:37 +0200, Felix Kühling <[EMAIL PROTECTED]> wrote:
I'm trying to get Shadow status working in the savage driver. I'd like to put the status page into locked shared memory and tell the Savage chips about its physical address. I used a drmAddMap call copied from the MGA driver that looked like it did what I wanted. But I had to find out that the handle returned by drmAddMap is a kernel virtual address, not a physical address. Later I saw that the status page seems to be unused in the MGA driver. The code to get the physical address from the kernel virtual address is #if-ed out, probably for portability reasons.
Does the code in drm_pci.c apply? It's only used by the via driver. I'm not sure what it does.
I guess if I was only going to use that memory in kernel drm_pci_alloc would be fine. But I want to map the status page at least in the Xserver, maybe also in clients.
Take a look at km or v4l drivers - maybe there is something you can use.
With 2.4 I used rvmalloc - I don't recall whether there is a standard mechanism for this in 2.6.
The point is that I'm not just looking for a way to get a physical address in Linux. In that case I'd just use virt_to_bus on the map handle. Since I only need a single page I also don't need to worry about allocating consistent memory. However, I want to use the mechanisms available in the DRM abstraction layer so that the savage driver stays (at least theoretically) portable to BSD and so that I can use drmMap/drmMapBufs to map the status page in the Xserver and/or in DRI clients.
I'm not sure that such a mechanism exists. If it doesn't, I think the onus falls on the porter to provide one, if a port is ever attempted.
Keith
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