Hi Marc:
        I think there is a bug in current its_alloc_tables().
When "val |= alloc_pages - 1;" is called
the "alloc_pages" is not updated accroding to "psz" value.

I mean we need do
alloc_pages = (alloc_size / psz);

Further more, I also have a question about GITS_CBASER register.
In gic-v3 spec:

Bits [7:0]. Size. The number of '4kB' pages of physical memory provided for the 
command queue, minus
one.

But In its_alloc_tables() function,

alloc_pages = (alloc_size / psz);   //  majun: pze = 64KB
if (alloc_pages > GITS_BASER_PAGES_MAX) {
        alloc_pages = GITS_BASER_PAGES_MAX;
        order = get_order(GITS_BASER_PAGES_MAX * psz);
        pr_warn("ITS@0x%lx: Device Table too large, reduce its page order to %u 
(%u pages)\n",
                its->phys_base, order, alloc_pages);
}
GITS_BASER_PAGES_MAX = 256
I think this value means the maximum page number of 4KB ,right ?

But when calc alloc_pages for first time, the psz = 64KB.

So, I think maybe this is a bug too.

Thanks!
Ma Jun











--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Reply via email to