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A Power6 can give up CPU cycles on a dedicated CPU (as opposed to a shared CPU) to other shared processors if the administrator asks for it (via the HMC). This enables that to work properly on P6. This just involves setting a bit in the CAS structure as well as the VPA. To donate cycles, a CPU has to have all SMT threads idle and have the donate bit set in the VPA. Then call H_CEDE. The reason why shared processors just aren't used is because dedicated CPUs are guaranteed an actual processor, yet the system is still able to increase the capacity of the shared CPU pool. Also rename the VPA's cpuctls_task_attrs field to a more accurate name. Signed-off-by: Jake Moilanen <moilanen@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
157 lines
7.1 KiB
C
157 lines
7.1 KiB
C
/*
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* lppaca.h
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* Copyright (C) 2001 Mike Corrigan IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _ASM_POWERPC_LPPACA_H
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#define _ASM_POWERPC_LPPACA_H
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#ifdef __KERNEL__
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//=============================================================================
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//
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// This control block contains the data that is shared between the
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// hypervisor (PLIC) and the OS.
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//
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//
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//----------------------------------------------------------------------------
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#include <linux/cache.h>
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#include <asm/types.h>
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#include <asm/mmu.h>
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/* The Hypervisor barfs if the lppaca crosses a page boundary. A 1k
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* alignment is sufficient to prevent this */
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struct lppaca {
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//=============================================================================
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// CACHE_LINE_1 0x0000 - 0x007F Contains read-only data
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// NOTE: The xDynXyz fields are fields that will be dynamically changed by
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// PLIC when preparing to bring a processor online or when dispatching a
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// virtual processor!
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//=============================================================================
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u32 desc; // Eye catcher 0xD397D781 x00-x03
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u16 size; // Size of this struct x04-x05
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u16 reserved1; // Reserved x06-x07
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u16 reserved2:14; // Reserved x08-x09
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u8 shared_proc:1; // Shared processor indicator ...
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u8 secondary_thread:1; // Secondary thread indicator ...
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volatile u8 dyn_proc_status:8; // Dynamic Status of this proc x0A-x0A
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u8 secondary_thread_count; // Secondary thread count x0B-x0B
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volatile u16 dyn_hv_phys_proc_index;// Dynamic HV Physical Proc Index0C-x0D
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volatile u16 dyn_hv_log_proc_index;// Dynamic HV Logical Proc Indexx0E-x0F
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u32 decr_val; // Value for Decr programming x10-x13
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u32 pmc_val; // Value for PMC regs x14-x17
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volatile u32 dyn_hw_node_id; // Dynamic Hardware Node id x18-x1B
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volatile u32 dyn_hw_proc_id; // Dynamic Hardware Proc Id x1C-x1F
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volatile u32 dyn_pir; // Dynamic ProcIdReg value x20-x23
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u32 dsei_data; // DSEI data x24-x27
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u64 sprg3; // SPRG3 value x28-x2F
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u8 reserved3[80]; // Reserved x30-x7F
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//=============================================================================
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// CACHE_LINE_2 0x0080 - 0x00FF Contains local read-write data
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//=============================================================================
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// This Dword contains a byte for each type of interrupt that can occur.
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// The IPI is a count while the others are just a binary 1 or 0.
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union {
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u64 any_int;
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struct {
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u16 reserved; // Reserved - cleared by #mpasmbl
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u8 xirr_int; // Indicates xXirrValue is valid or Immed IO
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u8 ipi_cnt; // IPI Count
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u8 decr_int; // DECR interrupt occurred
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u8 pdc_int; // PDC interrupt occurred
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u8 quantum_int; // Interrupt quantum reached
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u8 old_plic_deferred_ext_int; // Old PLIC has a deferred XIRR pending
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} fields;
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} int_dword;
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// Whenever any fields in this Dword are set then PLIC will defer the
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// processing of external interrupts. Note that PLIC will store the
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// XIRR directly into the xXirrValue field so that another XIRR will
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// not be presented until this one clears. The layout of the low
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// 4-bytes of this Dword is upto SLIC - PLIC just checks whether the
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// entire Dword is zero or not. A non-zero value in the low order
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// 2-bytes will result in SLIC being granted the highest thread
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// priority upon return. A 0 will return to SLIC as medium priority.
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u64 plic_defer_ints_area; // Entire Dword
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// Used to pass the real SRR0/1 from PLIC to SLIC as well as to
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// pass the target SRR0/1 from SLIC to PLIC on a SetAsrAndRfid.
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u64 saved_srr0; // Saved SRR0 x10-x17
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u64 saved_srr1; // Saved SRR1 x18-x1F
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// Used to pass parms from the OS to PLIC for SetAsrAndRfid
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u64 saved_gpr3; // Saved GPR3 x20-x27
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u64 saved_gpr4; // Saved GPR4 x28-x2F
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u64 saved_gpr5; // Saved GPR5 x30-x37
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u8 reserved4; // Reserved x38-x38
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u8 donate_dedicated_cpu; // Donate dedicated CPU cycles x39-x39
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u8 fpregs_in_use; // FP regs in use x3A-x3A
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u8 pmcregs_in_use; // PMC regs in use x3B-x3B
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volatile u32 saved_decr; // Saved Decr Value x3C-x3F
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volatile u64 emulated_time_base;// Emulated TB for this thread x40-x47
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volatile u64 cur_plic_latency; // Unaccounted PLIC latency x48-x4F
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u64 tot_plic_latency; // Accumulated PLIC latency x50-x57
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u64 wait_state_cycles; // Wait cycles for this proc x58-x5F
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u64 end_of_quantum; // TB at end of quantum x60-x67
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u64 pdc_saved_sprg1; // Saved SPRG1 for PMC int x68-x6F
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u64 pdc_saved_srr0; // Saved SRR0 for PMC int x70-x77
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volatile u32 virtual_decr; // Virtual DECR for shared procsx78-x7B
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u16 slb_count; // # of SLBs to maintain x7C-x7D
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u8 idle; // Indicate OS is idle x7E
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u8 vmxregs_in_use; // VMX registers in use x7F
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//=============================================================================
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// CACHE_LINE_3 0x0100 - 0x017F: This line is shared with other processors
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//=============================================================================
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// This is the yield_count. An "odd" value (low bit on) means that
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// the processor is yielded (either because of an OS yield or a PLIC
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// preempt). An even value implies that the processor is currently
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// executing.
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// NOTE: This value will ALWAYS be zero for dedicated processors and
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// will NEVER be zero for shared processors (ie, initialized to a 1).
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volatile u32 yield_count; // PLIC increments each dispatchx00-x03
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u8 reserved6[124]; // Reserved x04-x7F
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//=============================================================================
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// CACHE_LINE_4-5 0x0180 - 0x027F Contains PMC interrupt data
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//=============================================================================
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u8 pmc_save_area[256]; // PMC interrupt Area x00-xFF
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} __attribute__((__aligned__(0x400)));
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extern struct lppaca lppaca[];
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/*
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* SLB shadow buffer structure as defined in the PAPR. The save_area
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* contains adjacent ESID and VSID pairs for each shadowed SLB. The
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* ESID is stored in the lower 64bits, then the VSID.
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*/
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struct slb_shadow {
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u32 persistent; // Number of persistent SLBs x00-x03
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u32 buffer_length; // Total shadow buffer length x04-x07
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u64 reserved; // Alignment x08-x0f
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struct {
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u64 esid;
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u64 vsid;
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} save_area[SLB_NUM_BOLTED]; // x10-x40
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} ____cacheline_aligned;
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extern struct slb_shadow slb_shadow[];
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#endif /* __KERNEL__ */
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#endif /* _ASM_POWERPC_LPPACA_H */
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