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platform/x86/amd: pmf: Add infrastructure for quirking supported funcs

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In the event of a BIOS bug add infrastructure that will be utilized
to override the return value for supported_funcs to avoid enabling
features.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Link: https://lore.kernel.org/r/20240410140956.385-2-mario.limonciello@amd.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
This commit is contained in:
Mario Limonciello 2024-04-10 09:09:55 -05:00 committed by Ilpo Järvinen
parent 03cea821b8
commit ed13f622bc
No known key found for this signature in database
GPG Key ID: 59AC4F6153E5CE31
5 changed files with 52 additions and 2 deletions
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2
drivers/platform/x86/amd/pmf/Makefile
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@ -7,4 +7,4 @@
obj-$(CONFIG_AMD_PMF) += amd-pmf.o
amd-pmf-objs := core.o acpi.o sps.o \
auto-mode.o cnqf.o \
tee-if.o spc.o
tee-if.o spc.o pmf-quirks.o

3
drivers/platform/x86/amd/pmf/acpi.c
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@ -343,7 +343,10 @@ static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
if (err)
return err;
/* only set if not already set by a quirk */
if (!pdev->supported_func)
pdev->supported_func = output.supported_functions;
dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x version:%u\n",
output.supported_functions, output.notification_mask, output.version);

1
drivers/platform/x86/amd/pmf/core.c
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@ -445,6 +445,7 @@ static int amd_pmf_probe(struct platform_device *pdev)
mutex_init(&dev->lock);
mutex_init(&dev->update_mutex);
amd_pmf_quirks_init(dev);
apmf_acpi_init(dev);
platform_set_drvdata(pdev, dev);
amd_pmf_dbgfs_register(dev);

43
drivers/platform/x86/amd/pmf/pmf-quirks.c Normal file
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@ -0,0 +1,43 @@
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* AMD Platform Management Framework Driver Quirks
*
* Copyright (c) 2024, Advanced Micro Devices, Inc.
* All Rights Reserved.
*
* Author: Mario Limonciello <mario.limonciello@amd.com>
*/
#include <linux/dmi.h>
#include "pmf.h"
struct quirk_entry {
u32 supported_func;
};
static struct quirk_entry quirk_no_sps_bug = {
.supported_func = 0x4003,
};
static const struct dmi_system_id fwbug_list[] = {
{}
};
void amd_pmf_quirks_init(struct amd_pmf_dev *dev)
{
const struct dmi_system_id *dmi_id;
struct quirk_entry *quirks;
dmi_id = dmi_first_match(fwbug_list);
if (!dmi_id)
return;
quirks = dmi_id->driver_data;
if (quirks->supported_func) {
dev->supported_func = quirks->supported_func;
pr_info("Using supported funcs quirk to avoid %s platform firmware bug\n",
dmi_id->ident);
}
}

3
drivers/platform/x86/amd/pmf/pmf.h
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@ -720,4 +720,7 @@ int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev);
void amd_pmf_populate_ta_inputs(struct amd_pmf_dev *dev, struct ta_pmf_enact_table *in);
void amd_pmf_dump_ta_inputs(struct amd_pmf_dev *dev, struct ta_pmf_enact_table *in);
/* Quirk infrastructure */
void amd_pmf_quirks_init(struct amd_pmf_dev *dev);
#endif /* PMF_H */