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/*
* 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);
}
}
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