From nobody Sat Feb 7 11:56:18 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3420D2FD1CF; Tue, 6 Jan 2026 05:15:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767676516; cv=none; b=oBCSj7mlqIVEofPiThhh9kQxBV+VishvA7QgEeHQbynowh01xzse4vFQTU7LBYPnZb2wEGTwIQl042iqP+gwoTLjudhCsj614n+VrfnvBH+oe1wkW3g/WYJPl2w3xLWCgDlDUzq9ziVFD4CKmpdeGOd5htK99psgH4pPPb1tdXo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767676516; c=relaxed/simple; bh=4Xf5M26QhIx7PvxjoOfMxL9jKXnZ/prTFEPkgVcsvr4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fXEqp92Yk8ktPpZpMmRBFqvZS0itvVdNCd/9ZdYBKed48wRnfVZt3K5bFhotdDkMJctBkFLtF/8SiCStLGb3hAcsvPvc3y7PkKDdXw9VLJ5CDzrsSEf1KU6LMEe1ZJBoJlKDvhHvYgNsSqt05FQoDlAa+TYQP0CcglibO/ZWTvw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qpjWOGXX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qpjWOGXX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7D559C19421; Tue, 6 Jan 2026 05:15:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767676516; bh=4Xf5M26QhIx7PvxjoOfMxL9jKXnZ/prTFEPkgVcsvr4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qpjWOGXXujo8syr/PZjNquS7Do0X0Szzg27eCgs/OoXjSr0XylK3mDjASskKOppxM cWgFHsGDzZ4v4uS93ngShmiqWgotLXveSZdyfsvTidFiCNT6YIgK3BHQ4VkmWvQh8D KmUFwEAAUAONeYpozmGgcDG1Fzgv0haMIPRvO1VfmusXAd6dAPQ05qeYL8u0JQseal kKQWFSG4FNvu5Xvn0grXbTaKpvA7dyrx+FN93Y/Hfl6LrJVfF5uuhyKY8mzW4Pxli4 3PqsG7vADGHAPC9MUUY2hbhrzyZQXWAp3RsjmyEOzXNzEabSxLRGte2YXmN6JM7+VU rl83mOQ85o5YA== From: "Mario Limonciello (AMD)" To: "Gautham R . Shenoy" Cc: Perry Yuan , linux-kernel@vger.kernel.org (open list:X86 ARCHITECTURE (32-BIT AND 64-BIT)), linux-pm@vger.kernel.org (open list:CPU FREQUENCY SCALING FRAMEWORK), Mario Limonciello Subject: [PATCH v5 5/5] cpufreq/amd-pstate-ut: Add a unit test for raw EPP Date: Mon, 5 Jan 2026 23:14:41 -0600 Message-ID: <20260106051441.60093-6-superm1@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260106051441.60093-1-superm1@kernel.org> References: <20260106051441.60093-1-superm1@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Mario Limonciello Ensure that all supported raw EPP values work properly. Signed-off-by: Mario Limonciello --- drivers/cpufreq/amd-pstate-ut.c | 58 +++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) diff --git a/drivers/cpufreq/amd-pstate-ut.c b/drivers/cpufreq/amd-pstate-u= t.c index 447b9aa5ce40b..d51233b753db6 100644 --- a/drivers/cpufreq/amd-pstate-ut.c +++ b/drivers/cpufreq/amd-pstate-ut.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include =20 @@ -35,6 +36,7 @@ =20 #include "amd-pstate.h" =20 +DEFINE_FREE(cleanup_page, void *, if (_T) free_page((unsigned long)_T)) =20 struct amd_pstate_ut_struct { const char *name; @@ -48,6 +50,7 @@ static int amd_pstate_ut_acpi_cpc_valid(u32 index); static int amd_pstate_ut_check_enabled(u32 index); static int amd_pstate_ut_check_perf(u32 index); static int amd_pstate_ut_check_freq(u32 index); +static int amd_pstate_ut_epp(u32 index); static int amd_pstate_ut_check_driver(u32 index); =20 static struct amd_pstate_ut_struct amd_pstate_ut_cases[] =3D { @@ -55,6 +58,7 @@ static struct amd_pstate_ut_struct amd_pstate_ut_cases[] = =3D { {"amd_pstate_ut_check_enabled", amd_pstate_ut_check_enabled }, {"amd_pstate_ut_check_perf", amd_pstate_ut_check_perf }, {"amd_pstate_ut_check_freq", amd_pstate_ut_check_freq }, + {"amd_pstate_ut_epp", amd_pstate_ut_epp }, {"amd_pstate_ut_check_driver", amd_pstate_ut_check_driver } }; =20 @@ -241,6 +245,60 @@ static int amd_pstate_set_mode(enum amd_pstate_mode mo= de) return amd_pstate_update_status(mode_str, strlen(mode_str)); } =20 +static int amd_pstate_ut_epp(u32 index) +{ + struct cpufreq_policy *policy __free(put_cpufreq_policy) =3D NULL; + void *buf __free(cleanup_page) =3D NULL; + struct amd_cpudata *cpudata; + int ret, cpu =3D 0; + u16 epp; + + policy =3D cpufreq_cpu_get(cpu); + if (!policy) + return -ENODEV; + + cpudata =3D policy->driver_data; + + /* disable dynamic EPP before running test */ + if (cpudata->dynamic_epp) { + pr_debug("Dynamic EPP is enabled, disabling it\n"); + amd_pstate_clear_dynamic_epp(policy); + } + + buf =3D (void *)__get_free_page(GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret =3D amd_pstate_set_mode(AMD_PSTATE_ACTIVE); + if (ret) + return ret; + + for (epp =3D 0; epp <=3D U8_MAX; epp++) { + u8 val; + + /* write all EPP values */ + memset(buf, 0, sizeof(*buf)); + snprintf(buf, PAGE_SIZE, "%d", epp); + ret =3D store_energy_performance_preference(policy, buf, sizeof(*buf)); + if (ret < 0) + return ret; + + /* check if the EPP value reads back correctly for raw numbers */ + memset(buf, 0, sizeof(*buf)); + ret =3D show_energy_performance_preference(policy, buf); + if (ret < 0) + return ret; + strreplace(buf, '\n', '\0'); + ret =3D kstrtou8(buf, 0, &val); + if (!ret && epp !=3D val) { + pr_err("Raw EPP value mismatch: %d !=3D %d\n", epp, val); + return -EINVAL; + } + } + + return 0; +} + static int amd_pstate_ut_check_driver(u32 index) { enum amd_pstate_mode mode1, mode2 =3D AMD_PSTATE_DISABLE; --=20 2.43.0