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| author | Cédric Le Goater <clg@kaod.org> | 2017-08-30 21:46:10 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-09-02 21:02:34 +1000 |
| commit | 994ea2f41999113d84c317da3ec1e10aa6469b3f (patch) | |
| tree | 0564f84d38bc0d59ca14ddc02bb6c22c04bc9a43 /arch/powerpc/sysdev/xive/common.c | |
| parent | 3b79b26101936bbdb7a5c69161c69d65a1108fb0 (diff) | |
| download | linux-994ea2f41999113d84c317da3ec1e10aa6469b3f.tar.gz linux-994ea2f41999113d84c317da3ec1e10aa6469b3f.tar.bz2 linux-994ea2f41999113d84c317da3ec1e10aa6469b3f.zip | |
powerpc/xive: introduce a common routine xive_queue_page_alloc()
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>
Diffstat (limited to 'arch/powerpc/sysdev/xive/common.c')
| -rw-r--r-- | arch/powerpc/sysdev/xive/common.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c index 558df6542b1a..a30d6d12b92b 100644 --- a/arch/powerpc/sysdev/xive/common.c +++ b/arch/powerpc/sysdev/xive/common.c @@ -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; |