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x86/platform/uv: Account for UV Hubless in is_uvX_hub Ops

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The references in the is_uvX_hub() function uses the hub_info pointer
which will be NULL when the system is hubless.  This change avoids
that NULL dereference.  It is also an optimization in performance.

Signed-off-by: Mike Travis <mike.travis@hpe.com>
Reviewed-by: Steve Wahl <steve.wahl@hpe.com>
Reviewed-by: Dimitri Sivanich <dimitri.sivanich@hpe.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hedi Berriche <hedi.berriche@hpe.com>
Cc: Justin Ernst <justin.ernst@hpe.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Russ Anderson <russ.anderson@hpe.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190910145840.294981941@stormcage.eag.rdlabs.hpecorp.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Mike Travis 2019-09-10 09:58:47 -05:00 committed by Ingo Molnar
parent df55029f7e
commit 4fb7d08707
1 changed files with 25 additions and 46 deletions
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71
arch/x86/include/asm/uv/uv_hub.h
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@ -19,6 +19,7 @@
#include <linux/topology.h>
#include <asm/types.h>
#include <asm/percpu.h>
#include <asm/uv/uv.h>
#include <asm/uv/uv_mmrs.h>
#include <asm/uv/bios.h>
#include <asm/irq_vectors.h>
@ -243,83 +244,61 @@ static inline int uv_hub_info_check(int version)
#define UV4_HUB_REVISION_BASE 7
#define UV4A_HUB_REVISION_BASE 8 /* UV4 (fixed) rev 2 */
/* WARNING: UVx_HUB_IS_SUPPORTED defines are deprecated and will be removed */
static inline int is_uv1_hub(void)
{
#ifdef UV1_HUB_IS_SUPPORTED
static inline int is_uv1_hub(void)
{
return uv_hub_info->hub_revision < UV2_HUB_REVISION_BASE;
}
return is_uv_hubbed(uv(1));
#else
static inline int is_uv1_hub(void)
{
return 0;
}
#endif
}
static inline int is_uv2_hub(void)
{
#ifdef UV2_HUB_IS_SUPPORTED
static inline int is_uv2_hub(void)
{
return ((uv_hub_info->hub_revision >= UV2_HUB_REVISION_BASE) &&
(uv_hub_info->hub_revision < UV3_HUB_REVISION_BASE));
}
return is_uv_hubbed(uv(2));
#else
static inline int is_uv2_hub(void)
{
return 0;
}
#endif
}
static inline int is_uv3_hub(void)
{
#ifdef UV3_HUB_IS_SUPPORTED
static inline int is_uv3_hub(void)
{
return ((uv_hub_info->hub_revision >= UV3_HUB_REVISION_BASE) &&
(uv_hub_info->hub_revision < UV4_HUB_REVISION_BASE));
}
return is_uv_hubbed(uv(3));
#else
static inline int is_uv3_hub(void)
{
return 0;
}
#endif
}
/* First test "is UV4A", then "is UV4" */
static inline int is_uv4a_hub(void)
{
#ifdef UV4A_HUB_IS_SUPPORTED
static inline int is_uv4a_hub(void)
{
return (uv_hub_info->hub_revision >= UV4A_HUB_REVISION_BASE);
}
#else
static inline int is_uv4a_hub(void)
{
if (is_uv_hubbed(uv(4)))
return (uv_hub_info->hub_revision == UV4A_HUB_REVISION_BASE);
#endif
return 0;
}
#endif
static inline int is_uv4_hub(void)
{
#ifdef UV4_HUB_IS_SUPPORTED
static inline int is_uv4_hub(void)
{
return uv_hub_info->hub_revision >= UV4_HUB_REVISION_BASE;
}
return is_uv_hubbed(uv(4));
#else
static inline int is_uv4_hub(void)
{
return 0;
}
#endif
}
static inline int is_uvx_hub(void)
{
if (uv_hub_info->hub_revision >= UV2_HUB_REVISION_BASE)
return uv_hub_info->hub_revision;
return 0;
return (is_uv_hubbed(-2) >= uv(2));
}
static inline int is_uv_hub(void)
{
#ifdef UV1_HUB_IS_SUPPORTED
return uv_hub_info->hub_revision;
#endif
return is_uvx_hub();
return is_uv1_hub() || is_uvx_hub();
}
union uvh_apicid {