platform/x86/amd/pmf: Preserve custom BIOS inputs for evaluating the policies

JIRA: https://issues.redhat.com/browse/RHEL-73301

commit b21ec88
Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Date:   Mon Sep 1 16:31:38 2025 +0530

    platform/x86/amd/pmf: Preserve custom BIOS inputs for evaluating the policies

    The current code fails to send multiple BIOS input data to the PMF-TA
    for policy condition evaluation. Only the most recent BIOS input data is
    properly sent to the PMF-TA, while previous inputs are overwritten with
    the zeros.

    To address this issue, the BIOS input data should be stored and passed on
    to the PMF-TA.

    Co-developed-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
    Signed-off-by: Patil Rajesh Reddy <Patil.Reddy@amd.com>
    Tested-by: Yijun Shen <Yijun.Shen@Dell.com>
    Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
    Link: https://patch.msgid.link/20250901110140.2519072-8-Shyam-sundar.S-k@amd.com
    Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
    Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Signed-off-by: Steve Best <sbest@redhat.com>

Author: sfbest

drivers/platform/x86/amd/pmf/pmf.h

@@ -354,6 +354,10 @@ enum power_modes_v2 {
 	POWER_MODE_V2_MAX,
 };
 
+struct pmf_bios_inputs_prev {
+	u32 custom_bios_inputs[10];
+};
+
 struct amd_pmf_dev {
 	void __iomem *regbase;
 	void __iomem *smu_virt_addr;
@@ -400,6 +404,7 @@ struct amd_pmf_dev {
 	struct mutex cb_mutex;
 	u32 notifications;
 	struct apmf_sbios_req_v1 req1;
+	struct pmf_bios_inputs_prev cb_prev; /* To preserve custom BIOS inputs */
 };
 
 struct apmf_sps_prop_granular_v2 {

drivers/platform/x86/amd/pmf/spc.c

@@ -142,12 +142,18 @@ static void amd_pmf_update_bios_inputs(struct amd_pmf_dev *pdev, u32 pending_req
 		if (!(pending_req & inputs[i].bit_mask))
 			continue;
 		amd_pmf_set_ta_custom_bios_input(in, i, custom_policy[i]);
+		pdev->cb_prev.custom_bios_inputs[i] = custom_policy[i];
 	}
 }
 
 static void amd_pmf_get_custom_bios_inputs(struct amd_pmf_dev *pdev,
 					   struct ta_pmf_enact_table *in)
 {
+	unsigned int i;
+
+	for (i = 0; i < ARRAY_SIZE(custom_bios_inputs); i++)
+		amd_pmf_set_ta_custom_bios_input(in, i, pdev->cb_prev.custom_bios_inputs[i]);
+
 	if (!(pdev->req.pending_req || pdev->req1.pending_req))
 		return;