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382 lines
8.7 KiB
382 lines
8.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright 2014 IBM Corp. |
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*/ |
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#include <linux/spinlock.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/device.h> |
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#include <linux/mutex.h> |
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#include <linux/init.h> |
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#include <linux/list.h> |
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#include <linux/mm.h> |
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#include <linux/of.h> |
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#include <linux/slab.h> |
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#include <linux/idr.h> |
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#include <linux/pci.h> |
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#include <linux/sched/task.h> |
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#include <asm/cputable.h> |
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#include <asm/mmu.h> |
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#include <misc/cxl-base.h> |
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#include "cxl.h" |
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#include "trace.h" |
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static DEFINE_SPINLOCK(adapter_idr_lock); |
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static DEFINE_IDR(cxl_adapter_idr); |
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uint cxl_verbose; |
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module_param_named(verbose, cxl_verbose, uint, 0600); |
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MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); |
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const struct cxl_backend_ops *cxl_ops; |
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int cxl_afu_slbia(struct cxl_afu *afu) |
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{ |
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unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT); |
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pr_devel("cxl_afu_slbia issuing SLBIA command\n"); |
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cxl_p2n_write(afu, CXL_SLBIA_An, CXL_TLB_SLB_IQ_ALL); |
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while (cxl_p2n_read(afu, CXL_SLBIA_An) & CXL_TLB_SLB_P) { |
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if (time_after_eq(jiffies, timeout)) { |
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dev_warn(&afu->dev, "WARNING: CXL AFU SLBIA timed out!\n"); |
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return -EBUSY; |
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} |
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/* If the adapter has gone down, we can assume that we |
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* will PERST it and that will invalidate everything. |
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*/ |
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if (!cxl_ops->link_ok(afu->adapter, afu)) |
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return -EIO; |
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cpu_relax(); |
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} |
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return 0; |
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} |
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static inline void _cxl_slbia(struct cxl_context *ctx, struct mm_struct *mm) |
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{ |
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unsigned long flags; |
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if (ctx->mm != mm) |
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return; |
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pr_devel("%s matched mm - card: %i afu: %i pe: %i\n", __func__, |
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ctx->afu->adapter->adapter_num, ctx->afu->slice, ctx->pe); |
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spin_lock_irqsave(&ctx->sste_lock, flags); |
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trace_cxl_slbia(ctx); |
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memset(ctx->sstp, 0, ctx->sst_size); |
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spin_unlock_irqrestore(&ctx->sste_lock, flags); |
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mb(); |
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cxl_afu_slbia(ctx->afu); |
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} |
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static inline void cxl_slbia_core(struct mm_struct *mm) |
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{ |
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struct cxl *adapter; |
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struct cxl_afu *afu; |
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struct cxl_context *ctx; |
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int card, slice, id; |
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pr_devel("%s called\n", __func__); |
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spin_lock(&adapter_idr_lock); |
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idr_for_each_entry(&cxl_adapter_idr, adapter, card) { |
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/* XXX: Make this lookup faster with link from mm to ctx */ |
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spin_lock(&adapter->afu_list_lock); |
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for (slice = 0; slice < adapter->slices; slice++) { |
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afu = adapter->afu[slice]; |
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if (!afu || !afu->enabled) |
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continue; |
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rcu_read_lock(); |
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idr_for_each_entry(&afu->contexts_idr, ctx, id) |
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_cxl_slbia(ctx, mm); |
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rcu_read_unlock(); |
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} |
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spin_unlock(&adapter->afu_list_lock); |
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} |
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spin_unlock(&adapter_idr_lock); |
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} |
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static struct cxl_calls cxl_calls = { |
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.cxl_slbia = cxl_slbia_core, |
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.owner = THIS_MODULE, |
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}; |
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int cxl_alloc_sst(struct cxl_context *ctx) |
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{ |
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unsigned long vsid; |
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u64 ea_mask, size, sstp0, sstp1; |
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sstp0 = 0; |
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sstp1 = 0; |
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ctx->sst_size = PAGE_SIZE; |
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ctx->sst_lru = 0; |
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ctx->sstp = (struct cxl_sste *)get_zeroed_page(GFP_KERNEL); |
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if (!ctx->sstp) { |
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pr_err("cxl_alloc_sst: Unable to allocate segment table\n"); |
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return -ENOMEM; |
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} |
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pr_devel("SSTP allocated at 0x%p\n", ctx->sstp); |
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vsid = get_kernel_vsid((u64)ctx->sstp, mmu_kernel_ssize) << 12; |
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sstp0 |= (u64)mmu_kernel_ssize << CXL_SSTP0_An_B_SHIFT; |
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sstp0 |= (SLB_VSID_KERNEL | mmu_psize_defs[mmu_linear_psize].sllp) << 50; |
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size = (((u64)ctx->sst_size >> 8) - 1) << CXL_SSTP0_An_SegTableSize_SHIFT; |
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if (unlikely(size & ~CXL_SSTP0_An_SegTableSize_MASK)) { |
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WARN(1, "Impossible segment table size\n"); |
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return -EINVAL; |
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} |
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sstp0 |= size; |
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if (mmu_kernel_ssize == MMU_SEGSIZE_256M) |
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ea_mask = 0xfffff00ULL; |
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else |
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ea_mask = 0xffffffff00ULL; |
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sstp0 |= vsid >> (50-14); /* Top 14 bits of VSID */ |
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sstp1 |= (vsid << (64-(50-14))) & ~ea_mask; |
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sstp1 |= (u64)ctx->sstp & ea_mask; |
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sstp1 |= CXL_SSTP1_An_V; |
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pr_devel("Looked up %#llx: slbfee. %#llx (ssize: %x, vsid: %#lx), copied to SSTP0: %#llx, SSTP1: %#llx\n", |
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(u64)ctx->sstp, (u64)ctx->sstp & ESID_MASK, mmu_kernel_ssize, vsid, sstp0, sstp1); |
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/* Store calculated sstp hardware points for use later */ |
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ctx->sstp0 = sstp0; |
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ctx->sstp1 = sstp1; |
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return 0; |
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} |
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/* print buffer content as integers when debugging */ |
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void cxl_dump_debug_buffer(void *buf, size_t buf_len) |
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{ |
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#ifdef DEBUG |
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int i, *ptr; |
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/* |
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* We want to regroup up to 4 integers per line, which means they |
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* need to be in the same pr_devel() statement |
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*/ |
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ptr = (int *) buf; |
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for (i = 0; i * 4 < buf_len; i += 4) { |
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if ((i + 3) * 4 < buf_len) |
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pr_devel("%.8x %.8x %.8x %.8x\n", ptr[i], ptr[i + 1], |
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ptr[i + 2], ptr[i + 3]); |
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else if ((i + 2) * 4 < buf_len) |
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pr_devel("%.8x %.8x %.8x\n", ptr[i], ptr[i + 1], |
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ptr[i + 2]); |
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else if ((i + 1) * 4 < buf_len) |
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pr_devel("%.8x %.8x\n", ptr[i], ptr[i + 1]); |
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else |
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pr_devel("%.8x\n", ptr[i]); |
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} |
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#endif /* DEBUG */ |
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} |
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/* Find a CXL adapter by it's number and increase it's refcount */ |
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struct cxl *get_cxl_adapter(int num) |
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{ |
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struct cxl *adapter; |
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spin_lock(&adapter_idr_lock); |
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if ((adapter = idr_find(&cxl_adapter_idr, num))) |
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get_device(&adapter->dev); |
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spin_unlock(&adapter_idr_lock); |
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return adapter; |
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} |
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static int cxl_alloc_adapter_nr(struct cxl *adapter) |
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{ |
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int i; |
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idr_preload(GFP_KERNEL); |
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spin_lock(&adapter_idr_lock); |
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i = idr_alloc(&cxl_adapter_idr, adapter, 0, 0, GFP_NOWAIT); |
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spin_unlock(&adapter_idr_lock); |
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idr_preload_end(); |
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if (i < 0) |
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return i; |
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adapter->adapter_num = i; |
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return 0; |
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} |
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void cxl_remove_adapter_nr(struct cxl *adapter) |
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{ |
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idr_remove(&cxl_adapter_idr, adapter->adapter_num); |
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} |
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struct cxl *cxl_alloc_adapter(void) |
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{ |
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struct cxl *adapter; |
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if (!(adapter = kzalloc(sizeof(struct cxl), GFP_KERNEL))) |
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return NULL; |
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spin_lock_init(&adapter->afu_list_lock); |
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if (cxl_alloc_adapter_nr(adapter)) |
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goto err1; |
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if (dev_set_name(&adapter->dev, "card%i", adapter->adapter_num)) |
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goto err2; |
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/* start with context lock taken */ |
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atomic_set(&adapter->contexts_num, -1); |
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return adapter; |
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err2: |
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cxl_remove_adapter_nr(adapter); |
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err1: |
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kfree(adapter); |
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return NULL; |
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} |
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struct cxl_afu *cxl_alloc_afu(struct cxl *adapter, int slice) |
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{ |
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struct cxl_afu *afu; |
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if (!(afu = kzalloc(sizeof(struct cxl_afu), GFP_KERNEL))) |
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return NULL; |
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afu->adapter = adapter; |
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afu->dev.parent = &adapter->dev; |
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afu->dev.release = cxl_ops->release_afu; |
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afu->slice = slice; |
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idr_init(&afu->contexts_idr); |
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mutex_init(&afu->contexts_lock); |
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spin_lock_init(&afu->afu_cntl_lock); |
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atomic_set(&afu->configured_state, -1); |
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afu->prefault_mode = CXL_PREFAULT_NONE; |
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afu->irqs_max = afu->adapter->user_irqs; |
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return afu; |
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} |
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int cxl_afu_select_best_mode(struct cxl_afu *afu) |
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{ |
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if (afu->modes_supported & CXL_MODE_DIRECTED) |
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return cxl_ops->afu_activate_mode(afu, CXL_MODE_DIRECTED); |
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if (afu->modes_supported & CXL_MODE_DEDICATED) |
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return cxl_ops->afu_activate_mode(afu, CXL_MODE_DEDICATED); |
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dev_warn(&afu->dev, "No supported programming modes available\n"); |
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/* We don't fail this so the user can inspect sysfs */ |
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return 0; |
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} |
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int cxl_adapter_context_get(struct cxl *adapter) |
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{ |
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int rc; |
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rc = atomic_inc_unless_negative(&adapter->contexts_num); |
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return rc ? 0 : -EBUSY; |
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} |
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void cxl_adapter_context_put(struct cxl *adapter) |
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{ |
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atomic_dec_if_positive(&adapter->contexts_num); |
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} |
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int cxl_adapter_context_lock(struct cxl *adapter) |
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{ |
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int rc; |
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/* no active contexts -> contexts_num == 0 */ |
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rc = atomic_cmpxchg(&adapter->contexts_num, 0, -1); |
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return rc ? -EBUSY : 0; |
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} |
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void cxl_adapter_context_unlock(struct cxl *adapter) |
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{ |
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int val = atomic_cmpxchg(&adapter->contexts_num, -1, 0); |
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/* |
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* contexts lock taken -> contexts_num == -1 |
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* If not true then show a warning and force reset the lock. |
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* This will happen when context_unlock was requested without |
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* doing a context_lock. |
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*/ |
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if (val != -1) { |
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atomic_set(&adapter->contexts_num, 0); |
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WARN(1, "Adapter context unlocked with %d active contexts", |
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val); |
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} |
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} |
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static int __init init_cxl(void) |
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{ |
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int rc = 0; |
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if (!tlbie_capable) |
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return -EINVAL; |
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if ((rc = cxl_file_init())) |
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return rc; |
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cxl_debugfs_init(); |
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/* |
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* we don't register the callback on P9. slb callack is only |
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* used for the PSL8 MMU and CX4. |
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*/ |
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if (cxl_is_power8()) { |
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rc = register_cxl_calls(&cxl_calls); |
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if (rc) |
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goto err; |
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} |
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if (cpu_has_feature(CPU_FTR_HVMODE)) { |
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cxl_ops = &cxl_native_ops; |
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rc = pci_register_driver(&cxl_pci_driver); |
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} |
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#ifdef CONFIG_PPC_PSERIES |
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else { |
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cxl_ops = &cxl_guest_ops; |
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rc = platform_driver_register(&cxl_of_driver); |
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} |
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#endif |
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if (rc) |
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goto err1; |
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return 0; |
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err1: |
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if (cxl_is_power8()) |
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unregister_cxl_calls(&cxl_calls); |
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err: |
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cxl_debugfs_exit(); |
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cxl_file_exit(); |
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return rc; |
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} |
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static void exit_cxl(void) |
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{ |
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if (cpu_has_feature(CPU_FTR_HVMODE)) |
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pci_unregister_driver(&cxl_pci_driver); |
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#ifdef CONFIG_PPC_PSERIES |
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else |
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platform_driver_unregister(&cxl_of_driver); |
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#endif |
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cxl_debugfs_exit(); |
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cxl_file_exit(); |
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if (cxl_is_power8()) |
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unregister_cxl_calls(&cxl_calls); |
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idr_destroy(&cxl_adapter_idr); |
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} |
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module_init(init_cxl); |
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module_exit(exit_cxl); |
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MODULE_DESCRIPTION("IBM Coherent Accelerator"); |
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MODULE_AUTHOR("Ian Munsie <[email protected]>"); |
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MODULE_LICENSE("GPL");
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