diff options
author | Jens Axboe <axboe@kernel.dk> | 2018-02-05 12:55:38 -0700 |
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committer | Jens Axboe <axboe@kernel.dk> | 2018-02-05 12:55:38 -0700 |
commit | 9e05c864993c5442227f83ae1694a737d7a102ed (patch) | |
tree | e35b60bb3c0c179f147e9acaad5444f1e5d9117e /drivers/misc/ocxl/pasid.c | |
parent | 3c15f3f545afa320c5e3822825a9a53c664776b6 (diff) | |
parent | 35277995e17919ab838beae765f440674e8576eb (diff) |
Merge branch 'master' into test
* master: (688 commits)
dt-bindings: mailbox: qcom: Document the APCS clock binding
mailbox: qcom: Create APCS child device for clock controller
mailbox: qcom: Convert APCS IPC driver to use regmap
KVM/SVM: Allow direct access to MSR_IA32_SPEC_CTRL
KVM/VMX: Allow direct access to MSR_IA32_SPEC_CTRL
KVM/VMX: Emulate MSR_IA32_ARCH_CAPABILITIES
KVM/x86: Add IBPB support
KVM/x86: Update the reverse_cpuid list to include CPUID_7_EDX
pinctrl: remove include file from <linux/device.h>
firmware: dmi: handle missing DMI data gracefully
firmware: dmi_scan: Fix handling of empty DMI strings
firmware: dmi_scan: Drop dmi_initialized
firmware: dmi: Optimize dmi_matches
Revert "defer call to mem_cgroup_sk_alloc()"
soreuseport: fix mem leak in reuseport_add_sock()
net: qlge: use memmove instead of skb_copy_to_linear_data
net: qed: use correct strncpy() size
net: cxgb4: avoid memcpy beyond end of source buffer
cls_u32: add missing RCU annotation.
r8152: set rx mode early when linking on
...
Diffstat (limited to 'drivers/misc/ocxl/pasid.c')
-rw-r--r-- | drivers/misc/ocxl/pasid.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/drivers/misc/ocxl/pasid.c b/drivers/misc/ocxl/pasid.c new file mode 100644 index 000000000000..d14cb56e6920 --- /dev/null +++ b/drivers/misc/ocxl/pasid.c @@ -0,0 +1,107 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Copyright 2017 IBM Corp. +#include "ocxl_internal.h" + + +struct id_range { + struct list_head list; + u32 start; + u32 end; +}; + +#ifdef DEBUG +static void dump_list(struct list_head *head, char *type_str) +{ + struct id_range *cur; + + pr_debug("%s ranges allocated:\n", type_str); + list_for_each_entry(cur, head, list) { + pr_debug("Range %d->%d\n", cur->start, cur->end); + } +} +#endif + +static int range_alloc(struct list_head *head, u32 size, int max_id, + char *type_str) +{ + struct list_head *pos; + struct id_range *cur, *new; + int rc, last_end; + + new = kmalloc(sizeof(struct id_range), GFP_KERNEL); + if (!new) + return -ENOMEM; + + pos = head; + last_end = -1; + list_for_each_entry(cur, head, list) { + if ((cur->start - last_end) > size) + break; + last_end = cur->end; + pos = &cur->list; + } + + new->start = last_end + 1; + new->end = new->start + size - 1; + + if (new->end > max_id) { + kfree(new); + rc = -ENOSPC; + } else { + list_add(&new->list, pos); + rc = new->start; + } + +#ifdef DEBUG + dump_list(head, type_str); +#endif + return rc; +} + +static void range_free(struct list_head *head, u32 start, u32 size, + char *type_str) +{ + bool found = false; + struct id_range *cur, *tmp; + + list_for_each_entry_safe(cur, tmp, head, list) { + if (cur->start == start && cur->end == (start + size - 1)) { + found = true; + list_del(&cur->list); + kfree(cur); + break; + } + } + WARN_ON(!found); +#ifdef DEBUG + dump_list(head, type_str); +#endif +} + +int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size) +{ + int max_pasid; + + if (fn->config.max_pasid_log < 0) + return -ENOSPC; + max_pasid = 1 << fn->config.max_pasid_log; + return range_alloc(&fn->pasid_list, size, max_pasid, "afu pasid"); +} + +void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size) +{ + return range_free(&fn->pasid_list, start, size, "afu pasid"); +} + +int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size) +{ + int max_actag; + + max_actag = fn->actag_enabled; + return range_alloc(&fn->actag_list, size, max_actag, "afu actag"); +} + +void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size) +{ + return range_free(&fn->actag_list, start, size, "afu actag"); +} |