forked from Minki/linux
bd104e6db6
LPPACA structures need to be shared with the host. Hence they need to be in shared memory. Instead of allocating individual chunks of memory for a given structure from memblock, a contiguous chunk of memory is allocated and then converted into shared memory. Subsequent allocation requests will come from the contiguous chunk which will be always shared memory for all structures. While we are able to use a kmem_cache constructor for the Debug Trace Log, LPPACAs are allocated very early in the boot process (before SLUB is available) so we need to use a simpler scheme here. Introduce helper is_svm_platform() which uses the S bit of the MSR to tell whether we're running as a secure guest. Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com> Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20190820021326.6884-9-bauerman@linux.ibm.com
322 lines
8.2 KiB
C
322 lines
8.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* c 2001 PPC 64 Team, IBM Corp
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*/
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#include <linux/smp.h>
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#include <linux/export.h>
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#include <linux/memblock.h>
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#include <linux/sched/task.h>
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#include <linux/numa.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/kexec.h>
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#include <asm/svm.h>
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#include <asm/ultravisor.h>
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#include "setup.h"
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#ifndef CONFIG_SMP
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#define boot_cpuid 0
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#endif
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static void *__init alloc_paca_data(unsigned long size, unsigned long align,
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unsigned long limit, int cpu)
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{
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void *ptr;
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int nid;
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/*
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* boot_cpuid paca is allocated very early before cpu_to_node is up.
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* Set bottom-up mode, because the boot CPU should be on node-0,
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* which will put its paca in the right place.
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*/
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if (cpu == boot_cpuid) {
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nid = NUMA_NO_NODE;
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memblock_set_bottom_up(true);
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} else {
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nid = early_cpu_to_node(cpu);
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}
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ptr = memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT,
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limit, nid);
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if (!ptr)
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panic("cannot allocate paca data");
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if (cpu == boot_cpuid)
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memblock_set_bottom_up(false);
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return ptr;
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}
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#ifdef CONFIG_PPC_PSERIES
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#define LPPACA_SIZE 0x400
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static void *__init alloc_shared_lppaca(unsigned long size, unsigned long align,
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unsigned long limit, int cpu)
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{
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size_t shared_lppaca_total_size = PAGE_ALIGN(nr_cpu_ids * LPPACA_SIZE);
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static unsigned long shared_lppaca_size;
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static void *shared_lppaca;
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void *ptr;
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if (!shared_lppaca) {
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memblock_set_bottom_up(true);
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shared_lppaca =
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memblock_alloc_try_nid(shared_lppaca_total_size,
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PAGE_SIZE, MEMBLOCK_LOW_LIMIT,
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limit, NUMA_NO_NODE);
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if (!shared_lppaca)
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panic("cannot allocate shared data");
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memblock_set_bottom_up(false);
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uv_share_page(PHYS_PFN(__pa(shared_lppaca)),
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shared_lppaca_total_size >> PAGE_SHIFT);
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}
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ptr = shared_lppaca + shared_lppaca_size;
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shared_lppaca_size += size;
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/*
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* This is very early in boot, so no harm done if the kernel crashes at
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* this point.
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*/
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BUG_ON(shared_lppaca_size >= shared_lppaca_total_size);
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return ptr;
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}
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/*
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* See asm/lppaca.h for more detail.
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*
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* lppaca structures must must be 1kB in size, L1 cache line aligned,
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* and not cross 4kB boundary. A 1kB size and 1kB alignment will satisfy
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* these requirements.
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*/
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static inline void init_lppaca(struct lppaca *lppaca)
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{
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BUILD_BUG_ON(sizeof(struct lppaca) != 640);
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*lppaca = (struct lppaca) {
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.desc = cpu_to_be32(0xd397d781), /* "LpPa" */
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.size = cpu_to_be16(LPPACA_SIZE),
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.fpregs_in_use = 1,
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.slb_count = cpu_to_be16(64),
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.vmxregs_in_use = 0,
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.page_ins = 0, };
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};
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static struct lppaca * __init new_lppaca(int cpu, unsigned long limit)
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{
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struct lppaca *lp;
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BUILD_BUG_ON(sizeof(struct lppaca) > LPPACA_SIZE);
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if (early_cpu_has_feature(CPU_FTR_HVMODE))
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return NULL;
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if (is_secure_guest())
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lp = alloc_shared_lppaca(LPPACA_SIZE, 0x400, limit, cpu);
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else
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lp = alloc_paca_data(LPPACA_SIZE, 0x400, limit, cpu);
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init_lppaca(lp);
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return lp;
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}
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#endif /* CONFIG_PPC_PSERIES */
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#ifdef CONFIG_PPC_BOOK3S_64
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/*
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* 3 persistent SLBs are allocated 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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* If you make the number of persistent SLB entries dynamic, please also
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* update PR KVM to flush and restore them accordingly.
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*/
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static struct slb_shadow * __init new_slb_shadow(int cpu, unsigned long limit)
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{
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struct slb_shadow *s;
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if (cpu != boot_cpuid) {
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/*
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* Boot CPU comes here before early_radix_enabled
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* is parsed (e.g., for disable_radix). So allocate
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* always and this will be fixed up in free_unused_pacas.
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*/
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if (early_radix_enabled())
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return NULL;
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}
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s = alloc_paca_data(sizeof(*s), L1_CACHE_BYTES, limit, cpu);
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s->persistent = cpu_to_be32(SLB_NUM_BOLTED);
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s->buffer_length = cpu_to_be32(sizeof(*s));
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return s;
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}
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#endif /* CONFIG_PPC_BOOK3S_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_ptrs __read_mostly;
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EXPORT_SYMBOL(paca_ptrs);
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void __init initialise_paca(struct paca_struct *new_paca, int cpu)
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{
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#ifdef CONFIG_PPC_PSERIES
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new_paca->lppaca_ptr = NULL;
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#endif
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#ifdef CONFIG_PPC_BOOK3E
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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_addr();
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new_paca->kernelbase = (unsigned long) _stext;
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/* Only set MSR:IR/DR when MMU is initialized */
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new_paca->kernel_msr = MSR_KERNEL & ~(MSR_IR | MSR_DR);
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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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new_paca->data_offset = 0xfeeeeeeeeeeeeeeeULL;
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#ifdef CONFIG_PPC_BOOK3S_64
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new_paca->slb_shadow_ptr = NULL;
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#endif
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#ifdef CONFIG_PPC_BOOK3E
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/* For now -- if we have threads this will be adjusted later */
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new_paca->tcd_ptr = &new_paca->tcd;
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#endif
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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 (early_cpu_has_feature(CPU_FTR_HVMODE))
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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_nr_cpu_ids;
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static int __initdata paca_ptrs_size;
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static int __initdata paca_struct_size;
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void __init allocate_paca_ptrs(void)
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{
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paca_nr_cpu_ids = nr_cpu_ids;
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paca_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
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paca_ptrs = memblock_alloc_raw(paca_ptrs_size, SMP_CACHE_BYTES);
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if (!paca_ptrs)
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panic("Failed to allocate %d bytes for paca pointers\n",
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paca_ptrs_size);
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memset(paca_ptrs, 0x88, paca_ptrs_size);
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}
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void __init allocate_paca(int cpu)
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{
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u64 limit;
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struct paca_struct *paca;
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BUG_ON(cpu >= paca_nr_cpu_ids);
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#ifdef CONFIG_PPC_BOOK3S_64
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/*
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* We access pacas in real mode, and cannot take SLB faults
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* on them when in virtual mode, so allocate them accordingly.
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*/
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limit = min(ppc64_bolted_size(), ppc64_rma_size);
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#else
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limit = ppc64_rma_size;
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#endif
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paca = alloc_paca_data(sizeof(struct paca_struct), L1_CACHE_BYTES,
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limit, cpu);
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paca_ptrs[cpu] = paca;
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initialise_paca(paca, cpu);
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#ifdef CONFIG_PPC_PSERIES
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paca->lppaca_ptr = new_lppaca(cpu, limit);
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#endif
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#ifdef CONFIG_PPC_BOOK3S_64
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paca->slb_shadow_ptr = new_slb_shadow(cpu, limit);
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#endif
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paca_struct_size += sizeof(struct paca_struct);
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}
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void __init free_unused_pacas(void)
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{
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int new_ptrs_size;
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new_ptrs_size = sizeof(struct paca_struct *) * nr_cpu_ids;
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if (new_ptrs_size < paca_ptrs_size)
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memblock_free(__pa(paca_ptrs) + new_ptrs_size,
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paca_ptrs_size - new_ptrs_size);
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paca_nr_cpu_ids = nr_cpu_ids;
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paca_ptrs_size = new_ptrs_size;
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#ifdef CONFIG_PPC_BOOK3S_64
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if (early_radix_enabled()) {
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/* Ugly fixup, see new_slb_shadow() */
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memblock_free(__pa(paca_ptrs[boot_cpuid]->slb_shadow_ptr),
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sizeof(struct slb_shadow));
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paca_ptrs[boot_cpuid]->slb_shadow_ptr = NULL;
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}
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#endif
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printk(KERN_DEBUG "Allocated %u bytes for %u pacas\n",
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paca_ptrs_size + paca_struct_size, nr_cpu_ids);
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}
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void copy_mm_to_paca(struct mm_struct *mm)
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{
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#ifdef CONFIG_PPC_BOOK3S
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mm_context_t *context = &mm->context;
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get_paca()->mm_ctx_id = context->id;
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#ifdef CONFIG_PPC_MM_SLICES
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VM_BUG_ON(!mm_ctx_slb_addr_limit(context));
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get_paca()->mm_ctx_slb_addr_limit = mm_ctx_slb_addr_limit(context);
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memcpy(&get_paca()->mm_ctx_low_slices_psize, mm_ctx_low_slices(context),
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LOW_SLICE_ARRAY_SZ);
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memcpy(&get_paca()->mm_ctx_high_slices_psize, mm_ctx_high_slices(context),
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TASK_SLICE_ARRAY_SZ(context));
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#else /* CONFIG_PPC_MM_SLICES */
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get_paca()->mm_ctx_user_psize = context->user_psize;
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get_paca()->mm_ctx_sllp = context->sllp;
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#endif
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#else /* !CONFIG_PPC_BOOK3S */
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return;
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#endif
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}
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