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powerpc/pseries: Add extended_cede_processor() helper function.

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This patch provides an extended_cede_processor() helper function
which takes the cede latency hint as an argument. This hint is to be passed
on to the hypervisor to cede to the corresponding state on platforms
which support it.

Signed-off-by: Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gautham R Shenoy
2009-10-29 19:22:48 +00:00
committed by Benjamin Herrenschmidt
parent d95cacc599
commit 69ddb57cbe
3 changed files with 32 additions and 2 deletions
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9
arch/powerpc/include/asm/lppaca.h
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@@ -100,7 +100,14 @@ struct lppaca {
// Used to pass parms from the OS to PLIC for SetAsrAndRfid
u64 saved_gpr3; // Saved GPR3 x20-x27
u64 saved_gpr4; // Saved GPR4 x28-x2F
u64 saved_gpr5; // Saved GPR5 x30-x37
union {
u64 saved_gpr5; /* Saved GPR5 x30-x37 */
struct {
u8 cede_latency_hint; /* x30 */
u8 reserved[7]; /* x31-x36 */
} fields;
} gpr5_dword;
u8 dtl_enable_mask; // Dispatch Trace Log mask x38-x38
u8 donate_dedicated_cpu; // Donate dedicated CPU cycles x39-x39