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/*
* Copyright 2016 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.
*
*/
#include <linux/errno.h>
#include "linux/delay.h"
#include "hwmgr.h"
#include "amd_acpi.h"
bool acpi_atcs_functions_supported(void *device, uint32_t index)
{
int32_t result;
struct atcs_verify_interface output_buf = {0};
int32_t temp_buffer = 1;
result = cgs_call_acpi_method(device, CGS_ACPI_METHOD_ATCS,
ATCS_FUNCTION_VERIFY_INTERFACE,
&temp_buffer,
&output_buf,
1,
sizeof(temp_buffer),
sizeof(output_buf));
return result == 0 ? (output_buf.function_bits & (1 << (index - 1))) != 0 : false;
}
int acpi_pcie_perf_request(void *device, uint8_t perf_req, bool advertise)
{
struct atcs_pref_req_input atcs_input;
struct atcs_pref_req_output atcs_output;
u32 retry = 3;
int result;
struct cgs_system_info info = {0};
if (!acpi_atcs_functions_supported(device, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST))
return -EINVAL;
info.size = sizeof(struct cgs_system_info);
info.info_id = CGS_SYSTEM_INFO_ADAPTER_BDF_ID;
result = cgs_query_system_info(device, &info);
if (result != 0)
return -EINVAL;
atcs_input.client_id = (uint16_t)info.value;
atcs_input.size = sizeof(struct atcs_pref_req_input);
atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
if (advertise)
atcs_input.flags |= ATCS_ADVERTISE_CAPS;
atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
atcs_input.perf_req = perf_req;
atcs_output.size = sizeof(struct atcs_pref_req_input);
while (retry--) {
result = cgs_call_acpi_method(device,
CGS_ACPI_METHOD_ATCS,
ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST,
&atcs_input,
&atcs_output,
0,
sizeof(atcs_input),
sizeof(atcs_output));
if (result != 0)
return -EIO;
switch (atcs_output.ret_val) {
case ATCS_REQUEST_REFUSED:
default:
return -EINVAL;
case ATCS_REQUEST_COMPLETE:
return 0;
case ATCS_REQUEST_IN_PROGRESS:
udelay(10);
break;
}
}
return 0;
}
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