/*
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* Copyright 2019 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: AMD
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*
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*/
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#include "mod_vmid.h"
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struct core_vmid {
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struct mod_vmid public;
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struct dc *dc;
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unsigned int num_vmid;
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unsigned int num_vmids_available;
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uint64_t ptb_assigned_to_vmid[MAX_VMID];
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struct dc_virtual_addr_space_config base_config;
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};
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#define MOD_VMID_TO_CORE(mod_vmid)\
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container_of(mod_vmid, struct core_vmid, public)
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static void add_ptb_to_table(struct core_vmid *core_vmid, unsigned int vmid, uint64_t ptb)
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{
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if (vmid < MAX_VMID) {
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core_vmid->ptb_assigned_to_vmid[vmid] = ptb;
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core_vmid->num_vmids_available--;
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}
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}
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static void clear_entry_from_vmid_table(struct core_vmid *core_vmid, unsigned int vmid)
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{
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if (vmid < MAX_VMID) {
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core_vmid->ptb_assigned_to_vmid[vmid] = 0;
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core_vmid->num_vmids_available++;
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}
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}
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static void evict_vmids(struct core_vmid *core_vmid)
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{
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int i;
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uint16_t ord = dc_get_vmid_use_vector(core_vmid->dc);
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// At this point any positions with value 0 are unused vmids, evict them
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for (i = 1; i < core_vmid->num_vmid; i++) {
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if (!(ord & (1u << i)))
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clear_entry_from_vmid_table(core_vmid, i);
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}
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}
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// Return value of -1 indicates vmid table unitialized or ptb dne in the table
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static int get_existing_vmid_for_ptb(struct core_vmid *core_vmid, uint64_t ptb)
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{
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int i;
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for (i = 0; i < core_vmid->num_vmid; i++) {
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if (core_vmid->ptb_assigned_to_vmid[i] == ptb)
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return i;
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}
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return -1;
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}
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// Expected to be called only when there's an available vmid
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static int get_next_available_vmid(struct core_vmid *core_vmid)
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{
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int i;
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for (i = 1; i < core_vmid->num_vmid; i++) {
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if (core_vmid->ptb_assigned_to_vmid[i] == 0)
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return i;
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}
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return -1;
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}
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uint8_t mod_vmid_get_for_ptb(struct mod_vmid *mod_vmid, uint64_t ptb)
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{
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struct core_vmid *core_vmid = MOD_VMID_TO_CORE(mod_vmid);
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int vmid = 0;
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// Physical address gets vmid 0
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if (ptb == 0)
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return 0;
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vmid = get_existing_vmid_for_ptb(core_vmid, ptb);
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if (vmid == -1) {
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struct dc_virtual_addr_space_config va_config = core_vmid->base_config;
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va_config.page_table_base_addr = ptb;
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if (core_vmid->num_vmids_available == 0)
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evict_vmids(core_vmid);
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vmid = get_next_available_vmid(core_vmid);
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if (vmid != -1) {
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add_ptb_to_table(core_vmid, vmid, ptb);
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dc_setup_vm_context(core_vmid->dc, &va_config, vmid);
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} else
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ASSERT(0);
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}
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return vmid;
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}
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void mod_vmid_reset(struct mod_vmid *mod_vmid)
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{
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struct core_vmid *core_vmid = MOD_VMID_TO_CORE(mod_vmid);
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core_vmid->num_vmids_available = core_vmid->num_vmid - 1;
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memset(core_vmid->ptb_assigned_to_vmid, 0, sizeof(core_vmid->ptb_assigned_to_vmid[0]) * MAX_VMID);
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}
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struct mod_vmid *mod_vmid_create(
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struct dc *dc,
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unsigned int num_vmid,
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struct dc_virtual_addr_space_config *va_config)
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{
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struct core_vmid *core_vmid;
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if (num_vmid <= 1)
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goto fail_no_vm_ctx;
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if (dc == NULL)
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goto fail_dc_null;
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core_vmid = kzalloc(sizeof(struct core_vmid), GFP_KERNEL);
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if (core_vmid == NULL)
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goto fail_alloc_context;
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core_vmid->dc = dc;
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core_vmid->num_vmid = num_vmid;
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core_vmid->num_vmids_available = num_vmid - 1;
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core_vmid->base_config = *va_config;
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memset(core_vmid->ptb_assigned_to_vmid, 0, sizeof(core_vmid->ptb_assigned_to_vmid[0]) * MAX_VMID);
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return &core_vmid->public;
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fail_no_vm_ctx:
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fail_alloc_context:
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fail_dc_null:
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return NULL;
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}
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void mod_vmid_destroy(struct mod_vmid *mod_vmid)
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{
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if (mod_vmid != NULL) {
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struct core_vmid *core_vmid = MOD_VMID_TO_CORE(mod_vmid);
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kfree(core_vmid);
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}
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}
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