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powerpc/xive: introduce a common routine xive_queue_page_alloc()

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This routine will be used in the spapr backend. Also introduce a short
xive_alloc_order() helper.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Cédric Le Goater
2017-08-30 21:46:10 +02:00
committed by Michael Ellerman
parent 3b79b26101
commit 994ea2f419
3 changed files with 27 additions and 11 deletions
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16
arch/powerpc/sysdev/xive/common.c
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@@ -1428,6 +1428,22 @@ bool __init xive_core_init(const struct xive_ops *ops, void __iomem *area, u32 o
return true;
}
__be32 *xive_queue_page_alloc(unsigned int cpu, u32 queue_shift)
{
unsigned int alloc_order;
struct page *pages;
__be32 *qpage;
alloc_order = xive_alloc_order(queue_shift);
pages = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL, alloc_order);
if (!pages)
return ERR_PTR(-ENOMEM);
qpage = (__be32 *)page_address(pages);
memset(qpage, 0, 1 << queue_shift);
return qpage;
}
static int __init xive_off(char *arg)
{
xive_cmdline_disabled = true;