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