diff options
Diffstat (limited to 'drivers/misc/cxl/main.c')
| -rw-r--r-- | drivers/misc/cxl/main.c | 383 |
1 files changed, 0 insertions, 383 deletions
diff --git a/drivers/misc/cxl/main.c b/drivers/misc/cxl/main.c deleted file mode 100644 index c1fbf6f588f7..000000000000 --- a/drivers/misc/cxl/main.c +++ /dev/null @@ -1,383 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Copyright 2014 IBM Corp. - */ - -#include <linux/spinlock.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/device.h> -#include <linux/mutex.h> -#include <linux/init.h> -#include <linux/list.h> -#include <linux/mm.h> -#include <linux/of.h> -#include <linux/slab.h> -#include <linux/idr.h> -#include <linux/pci.h> -#include <linux/platform_device.h> -#include <linux/sched/task.h> - -#include <asm/cputable.h> -#include <asm/mmu.h> -#include <misc/cxl-base.h> - -#include "cxl.h" -#include "trace.h" - -static DEFINE_SPINLOCK(adapter_idr_lock); -static DEFINE_IDR(cxl_adapter_idr); - -uint cxl_verbose; -module_param_named(verbose, cxl_verbose, uint, 0600); -MODULE_PARM_DESC(verbose, "Enable verbose dmesg output"); - -const struct cxl_backend_ops *cxl_ops; - -int cxl_afu_slbia(struct cxl_afu *afu) -{ - unsigned long timeout = jiffies + (HZ * CXL_TIMEOUT); - - pr_devel("cxl_afu_slbia issuing SLBIA command\n"); - cxl_p2n_write(afu, CXL_SLBIA_An, CXL_TLB_SLB_IQ_ALL); - while (cxl_p2n_read(afu, CXL_SLBIA_An) & CXL_TLB_SLB_P) { - if (time_after_eq(jiffies, timeout)) { - dev_warn(&afu->dev, "WARNING: CXL AFU SLBIA timed out!\n"); - return -EBUSY; - } - /* If the adapter has gone down, we can assume that we - * will PERST it and that will invalidate everything. - */ - if (!cxl_ops->link_ok(afu->adapter, afu)) - return -EIO; - cpu_relax(); - } - return 0; -} - -static inline void _cxl_slbia(struct cxl_context *ctx, struct mm_struct *mm) -{ - unsigned long flags; - - if (ctx->mm != mm) - return; - - pr_devel("%s matched mm - card: %i afu: %i pe: %i\n", __func__, - ctx->afu->adapter->adapter_num, ctx->afu->slice, ctx->pe); - - spin_lock_irqsave(&ctx->sste_lock, flags); - trace_cxl_slbia(ctx); - memset(ctx->sstp, 0, ctx->sst_size); - spin_unlock_irqrestore(&ctx->sste_lock, flags); - mb(); - cxl_afu_slbia(ctx->afu); -} - -static inline void cxl_slbia_core(struct mm_struct *mm) -{ - struct cxl *adapter; - struct cxl_afu *afu; - struct cxl_context *ctx; - int card, slice, id; - - pr_devel("%s called\n", __func__); - - spin_lock(&adapter_idr_lock); - idr_for_each_entry(&cxl_adapter_idr, adapter, card) { - /* XXX: Make this lookup faster with link from mm to ctx */ - spin_lock(&adapter->afu_list_lock); - for (slice = 0; slice < adapter->slices; slice++) { - afu = adapter->afu[slice]; - if (!afu || !afu->enabled) - continue; - rcu_read_lock(); - idr_for_each_entry(&afu->contexts_idr, ctx, id) - _cxl_slbia(ctx, mm); - rcu_read_unlock(); - } - spin_unlock(&adapter->afu_list_lock); - } - spin_unlock(&adapter_idr_lock); -} - -static struct cxl_calls cxl_calls = { - .cxl_slbia = cxl_slbia_core, - .owner = THIS_MODULE, -}; - -int cxl_alloc_sst(struct cxl_context *ctx) -{ - unsigned long vsid; - u64 ea_mask, size, sstp0, sstp1; - - sstp0 = 0; - sstp1 = 0; - - ctx->sst_size = PAGE_SIZE; - ctx->sst_lru = 0; - ctx->sstp = (struct cxl_sste *)get_zeroed_page(GFP_KERNEL); - if (!ctx->sstp) { - pr_err("cxl_alloc_sst: Unable to allocate segment table\n"); - return -ENOMEM; - } - pr_devel("SSTP allocated at 0x%p\n", ctx->sstp); - - vsid = get_kernel_vsid((u64)ctx->sstp, mmu_kernel_ssize) << 12; - - sstp0 |= (u64)mmu_kernel_ssize << CXL_SSTP0_An_B_SHIFT; - sstp0 |= (SLB_VSID_KERNEL | mmu_psize_defs[mmu_linear_psize].sllp) << 50; - - size = (((u64)ctx->sst_size >> 8) - 1) << CXL_SSTP0_An_SegTableSize_SHIFT; - if (unlikely(size & ~CXL_SSTP0_An_SegTableSize_MASK)) { - WARN(1, "Impossible segment table size\n"); - return -EINVAL; - } - sstp0 |= size; - - if (mmu_kernel_ssize == MMU_SEGSIZE_256M) - ea_mask = 0xfffff00ULL; - else - ea_mask = 0xffffffff00ULL; - - sstp0 |= vsid >> (50-14); /* Top 14 bits of VSID */ - sstp1 |= (vsid << (64-(50-14))) & ~ea_mask; - sstp1 |= (u64)ctx->sstp & ea_mask; - sstp1 |= CXL_SSTP1_An_V; - - pr_devel("Looked up %#llx: slbfee. %#llx (ssize: %x, vsid: %#lx), copied to SSTP0: %#llx, SSTP1: %#llx\n", - (u64)ctx->sstp, (u64)ctx->sstp & ESID_MASK, mmu_kernel_ssize, vsid, sstp0, sstp1); - - /* Store calculated sstp hardware points for use later */ - ctx->sstp0 = sstp0; - ctx->sstp1 = sstp1; - - return 0; -} - -/* print buffer content as integers when debugging */ -void cxl_dump_debug_buffer(void *buf, size_t buf_len) -{ -#ifdef DEBUG - int i, *ptr; - - /* - * We want to regroup up to 4 integers per line, which means they - * need to be in the same pr_devel() statement - */ - ptr = (int *) buf; - for (i = 0; i * 4 < buf_len; i += 4) { - if ((i + 3) * 4 < buf_len) - pr_devel("%.8x %.8x %.8x %.8x\n", ptr[i], ptr[i + 1], - ptr[i + 2], ptr[i + 3]); - else if ((i + 2) * 4 < buf_len) - pr_devel("%.8x %.8x %.8x\n", ptr[i], ptr[i + 1], - ptr[i + 2]); - else if ((i + 1) * 4 < buf_len) - pr_devel("%.8x %.8x\n", ptr[i], ptr[i + 1]); - else - pr_devel("%.8x\n", ptr[i]); - } -#endif /* DEBUG */ -} - -/* Find a CXL adapter by it's number and increase it's refcount */ -struct cxl *get_cxl_adapter(int num) -{ - struct cxl *adapter; - - spin_lock(&adapter_idr_lock); - if ((adapter = idr_find(&cxl_adapter_idr, num))) - get_device(&adapter->dev); - spin_unlock(&adapter_idr_lock); - - return adapter; -} - -static int cxl_alloc_adapter_nr(struct cxl *adapter) -{ - int i; - - idr_preload(GFP_KERNEL); - spin_lock(&adapter_idr_lock); - i = idr_alloc(&cxl_adapter_idr, adapter, 0, 0, GFP_NOWAIT); - spin_unlock(&adapter_idr_lock); - idr_preload_end(); - if (i < 0) - return i; - - adapter->adapter_num = i; - - return 0; -} - -void cxl_remove_adapter_nr(struct cxl *adapter) -{ - idr_remove(&cxl_adapter_idr, adapter->adapter_num); -} - -struct cxl *cxl_alloc_adapter(void) -{ - struct cxl *adapter; - - if (!(adapter = kzalloc(sizeof(struct cxl), GFP_KERNEL))) - return NULL; - - spin_lock_init(&adapter->afu_list_lock); - - if (cxl_alloc_adapter_nr(adapter)) - goto err1; - - if (dev_set_name(&adapter->dev, "card%i", adapter->adapter_num)) - goto err2; - - /* start with context lock taken */ - atomic_set(&adapter->contexts_num, -1); - - return adapter; -err2: - cxl_remove_adapter_nr(adapter); -err1: - kfree(adapter); - return NULL; -} - -struct cxl_afu *cxl_alloc_afu(struct cxl *adapter, int slice) -{ - struct cxl_afu *afu; - - if (!(afu = kzalloc(sizeof(struct cxl_afu), GFP_KERNEL))) - return NULL; - - afu->adapter = adapter; - afu->dev.parent = &adapter->dev; - afu->dev.release = cxl_ops->release_afu; - afu->slice = slice; - idr_init(&afu->contexts_idr); - mutex_init(&afu->contexts_lock); - spin_lock_init(&afu->afu_cntl_lock); - atomic_set(&afu->configured_state, -1); - afu->prefault_mode = CXL_PREFAULT_NONE; - afu->irqs_max = afu->adapter->user_irqs; - - return afu; -} - -int cxl_afu_select_best_mode(struct cxl_afu *afu) -{ - if (afu->modes_supported & CXL_MODE_DIRECTED) - return cxl_ops->afu_activate_mode(afu, CXL_MODE_DIRECTED); - - if (afu->modes_supported & CXL_MODE_DEDICATED) - return cxl_ops->afu_activate_mode(afu, CXL_MODE_DEDICATED); - - dev_warn(&afu->dev, "No supported programming modes available\n"); - /* We don't fail this so the user can inspect sysfs */ - return 0; -} - -int cxl_adapter_context_get(struct cxl *adapter) -{ - int rc; - - rc = atomic_inc_unless_negative(&adapter->contexts_num); - return rc ? 0 : -EBUSY; -} - -void cxl_adapter_context_put(struct cxl *adapter) -{ - atomic_dec_if_positive(&adapter->contexts_num); -} - -int cxl_adapter_context_lock(struct cxl *adapter) -{ - int rc; - /* no active contexts -> contexts_num == 0 */ - rc = atomic_cmpxchg(&adapter->contexts_num, 0, -1); - return rc ? -EBUSY : 0; -} - -void cxl_adapter_context_unlock(struct cxl *adapter) -{ - int val = atomic_cmpxchg(&adapter->contexts_num, -1, 0); - - /* - * contexts lock taken -> contexts_num == -1 - * If not true then show a warning and force reset the lock. - * This will happen when context_unlock was requested without - * doing a context_lock. - */ - if (val != -1) { - atomic_set(&adapter->contexts_num, 0); - WARN(1, "Adapter context unlocked with %d active contexts", - val); - } -} - -static int __init init_cxl(void) -{ - int rc = 0; - - if (!tlbie_capable) - return -EINVAL; - - if ((rc = cxl_file_init())) - return rc; - - cxl_debugfs_init(); - - /* - * we don't register the callback on P9. slb callack is only - * used for the PSL8 MMU and CX4. - */ - if (cxl_is_power8()) { - rc = register_cxl_calls(&cxl_calls); - if (rc) - goto err; - } - - if (cpu_has_feature(CPU_FTR_HVMODE)) { - cxl_ops = &cxl_native_ops; - rc = pci_register_driver(&cxl_pci_driver); - } -#ifdef CONFIG_PPC_PSERIES - else { - cxl_ops = &cxl_guest_ops; - rc = platform_driver_register(&cxl_of_driver); - } -#endif - if (rc) - goto err1; - - return 0; -err1: - if (cxl_is_power8()) - unregister_cxl_calls(&cxl_calls); -err: - cxl_debugfs_exit(); - cxl_file_exit(); - - return rc; -} - -static void exit_cxl(void) -{ - if (cpu_has_feature(CPU_FTR_HVMODE)) - pci_unregister_driver(&cxl_pci_driver); -#ifdef CONFIG_PPC_PSERIES - else - platform_driver_unregister(&cxl_of_driver); -#endif - - cxl_debugfs_exit(); - cxl_file_exit(); - if (cxl_is_power8()) - unregister_cxl_calls(&cxl_calls); - idr_destroy(&cxl_adapter_idr); -} - -module_init(init_cxl); -module_exit(exit_cxl); - -MODULE_DESCRIPTION("IBM Coherent Accelerator"); -MODULE_AUTHOR("Ian Munsie <imunsie@au1.ibm.com>"); -MODULE_LICENSE("GPL"); |