2dd60d79e0
When running in Hypervisor mode (arch 2.06 or later), we store the PACA in HSPRG0 instead of SPRG1. The architecture specifies that SPRGs may be lost during a "nap" power management operation (though they aren't currently on POWER7) and this enables use of SPRG1 by KVM guests. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
231 lines
6.1 KiB
C
231 lines
6.1 KiB
C
/*
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* c 2001 PPC 64 Team, IBM Corp
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/threads.h>
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#include <linux/module.h>
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#include <linux/memblock.h>
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#include <asm/firmware.h>
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#include <asm/lppaca.h>
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#include <asm/paca.h>
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#include <asm/sections.h>
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#include <asm/pgtable.h>
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#include <asm/iseries/lpar_map.h>
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#include <asm/iseries/hv_types.h>
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#include <asm/kexec.h>
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/* This symbol is provided by the linker - let it fill in the paca
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* field correctly */
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extern unsigned long __toc_start;
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#ifdef CONFIG_PPC_BOOK3S
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/*
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* The structure which the hypervisor knows about - this structure
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* should not cross a page boundary. The vpa_init/register_vpa call
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* is now known to fail if the lppaca structure crosses a page
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* boundary. The lppaca is also used on legacy iSeries and POWER5
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* pSeries boxes. The lppaca is 640 bytes long, and cannot readily
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* change since the hypervisor knows its layout, so a 1kB alignment
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* will suffice to ensure that it doesn't cross a page boundary.
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*/
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struct lppaca lppaca[] = {
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[0 ... (NR_LPPACAS-1)] = {
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.desc = 0xd397d781, /* "LpPa" */
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.size = sizeof(struct lppaca),
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.dyn_proc_status = 2,
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.decr_val = 0x00ff0000,
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.fpregs_in_use = 1,
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.end_of_quantum = 0xfffffffffffffffful,
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.slb_count = 64,
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.vmxregs_in_use = 0,
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.page_ins = 0,
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},
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};
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static struct lppaca *extra_lppacas;
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static long __initdata lppaca_size;
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static void allocate_lppacas(int nr_cpus, unsigned long limit)
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{
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if (nr_cpus <= NR_LPPACAS)
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return;
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lppaca_size = PAGE_ALIGN(sizeof(struct lppaca) *
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(nr_cpus - NR_LPPACAS));
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extra_lppacas = __va(memblock_alloc_base(lppaca_size,
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PAGE_SIZE, limit));
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}
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static struct lppaca *new_lppaca(int cpu)
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{
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struct lppaca *lp;
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if (cpu < NR_LPPACAS)
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return &lppaca[cpu];
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lp = extra_lppacas + (cpu - NR_LPPACAS);
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*lp = lppaca[0];
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return lp;
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}
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static void free_lppacas(void)
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{
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long new_size = 0, nr;
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if (!lppaca_size)
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return;
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nr = num_possible_cpus() - NR_LPPACAS;
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if (nr > 0)
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new_size = PAGE_ALIGN(nr * sizeof(struct lppaca));
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if (new_size >= lppaca_size)
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return;
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memblock_free(__pa(extra_lppacas) + new_size, lppaca_size - new_size);
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lppaca_size = new_size;
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}
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#else
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static inline void allocate_lppacas(int nr_cpus, unsigned long limit) { }
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static inline void free_lppacas(void) { }
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#endif /* CONFIG_PPC_BOOK3S */
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#ifdef CONFIG_PPC_STD_MMU_64
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/*
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* 3 persistent SLBs are registered here. The buffer will be zero
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* initially, hence will all be invaild until we actually write them.
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*/
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struct slb_shadow slb_shadow[] __cacheline_aligned = {
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[0 ... (NR_CPUS-1)] = {
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.persistent = SLB_NUM_BOLTED,
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.buffer_length = sizeof(struct slb_shadow),
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},
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};
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#endif /* CONFIG_PPC_STD_MMU_64 */
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/* The Paca is an array with one entry per processor. Each contains an
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* lppaca, which contains the information shared between the
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* hypervisor and Linux.
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* On systems with hardware multi-threading, there are two threads
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* per processor. The Paca array must contain an entry for each thread.
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* The VPD Areas will give a max logical processors = 2 * max physical
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* processors. The processor VPD array needs one entry per physical
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* processor (not thread).
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*/
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struct paca_struct *paca;
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EXPORT_SYMBOL(paca);
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struct paca_struct boot_paca;
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void __init initialise_paca(struct paca_struct *new_paca, int cpu)
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{
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/* The TOC register (GPR2) points 32kB into the TOC, so that 64kB
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* of the TOC can be addressed using a single machine instruction.
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*/
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unsigned long kernel_toc = (unsigned long)(&__toc_start) + 0x8000UL;
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#ifdef CONFIG_PPC_BOOK3S
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new_paca->lppaca_ptr = new_lppaca(cpu);
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#else
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new_paca->kernel_pgd = swapper_pg_dir;
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#endif
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new_paca->lock_token = 0x8000;
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new_paca->paca_index = cpu;
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new_paca->kernel_toc = kernel_toc;
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new_paca->kernelbase = (unsigned long) _stext;
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new_paca->kernel_msr = MSR_KERNEL;
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new_paca->hw_cpu_id = 0xffff;
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new_paca->kexec_state = KEXEC_STATE_NONE;
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new_paca->__current = &init_task;
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#ifdef CONFIG_PPC_STD_MMU_64
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new_paca->slb_shadow_ptr = &slb_shadow[cpu];
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#endif /* CONFIG_PPC_STD_MMU_64 */
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}
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/* Put the paca pointer into r13 and SPRG_PACA */
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void setup_paca(struct paca_struct *new_paca)
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{
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/* Setup r13 */
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local_paca = new_paca;
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#ifdef CONFIG_PPC_BOOK3E
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/* On Book3E, initialize the TLB miss exception frames */
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mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb);
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#else
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/* In HV mode, we setup both HPACA and PACA to avoid problems
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* if we do a GET_PACA() before the feature fixups have been
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* applied
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*/
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if (cpu_has_feature(CPU_FTR_HVMODE_206))
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mtspr(SPRN_SPRG_HPACA, local_paca);
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#endif
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mtspr(SPRN_SPRG_PACA, local_paca);
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}
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static int __initdata paca_size;
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void __init allocate_pacas(void)
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{
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int nr_cpus, cpu, limit;
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/*
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* We can't take SLB misses on the paca, and we want to access them
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* in real mode, so allocate them within the RMA and also within
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* the first segment. On iSeries they must be within the area mapped
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* by the HV, which is HvPagesToMap * HVPAGESIZE bytes.
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*/
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limit = min(0x10000000ULL, ppc64_rma_size);
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if (firmware_has_feature(FW_FEATURE_ISERIES))
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limit = min(limit, HvPagesToMap * HVPAGESIZE);
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nr_cpus = NR_CPUS;
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/* On iSeries we know we can never have more than 64 cpus */
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if (firmware_has_feature(FW_FEATURE_ISERIES))
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nr_cpus = min(64, nr_cpus);
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paca_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpus);
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paca = __va(memblock_alloc_base(paca_size, PAGE_SIZE, limit));
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memset(paca, 0, paca_size);
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printk(KERN_DEBUG "Allocated %u bytes for %d pacas at %p\n",
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paca_size, nr_cpus, paca);
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allocate_lppacas(nr_cpus, limit);
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/* Can't use for_each_*_cpu, as they aren't functional yet */
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for (cpu = 0; cpu < nr_cpus; cpu++)
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initialise_paca(&paca[cpu], cpu);
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}
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void __init free_unused_pacas(void)
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{
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int new_size;
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new_size = PAGE_ALIGN(sizeof(struct paca_struct) * nr_cpu_ids);
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if (new_size >= paca_size)
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return;
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memblock_free(__pa(paca) + new_size, paca_size - new_size);
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printk(KERN_DEBUG "Freed %u bytes for unused pacas\n",
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paca_size - new_size);
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paca_size = new_size;
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free_lppacas();
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}
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