From: Ethan Zhao <ethan.zhao@oracle.com>
To: dirk.j.brandewie@intel.com, viresh.kumar@linaro.org,
rjw@rjwysocki.net, corbet@lwn.net
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-pm@vger.kernel.org, ethan.kernel@gmail.com,
joe.jin@oracle.com, brian.maly@oracle.com,
Ethan Zhao <ethan.zhao@oracle.com>
Subject: [PATCH 1/3] intel_pstate: skip the driver if Sun server has ACPI _PPC method
Date: Tue, 18 Nov 2014 17:37:04 +0900 [thread overview]
Message-ID: <1416299826-15813-6-git-send-email-ethan.zhao@oracle.com> (raw)
In-Reply-To: <1416299826-15813-1-git-send-email-ethan.zhao@oracle.com>
Oracle Sun X86 servers have dynamic power capping capability that works via
ACPI _PPC method etc, so skip loading this driver if Sun server has ACPI _PPC
enabled.
Signed-off-by: Ethan Zhao <ethan.zhao@oracle.com>
---
drivers/cpufreq/intel_pstate.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c
index 27bb6d3..5498eb0 100644
--- a/drivers/cpufreq/intel_pstate.c
+++ b/drivers/cpufreq/intel_pstate.c
@@ -943,6 +943,21 @@ static bool intel_pstate_no_acpi_pss(void)
return true;
}
+static bool intel_pstate_has_acpi_ppc(void)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ struct acpi_processor *pr = per_cpu(processors, i);
+
+ if (!pr)
+ continue;
+ if (acpi_has_method(pr->handle, "_PPC"))
+ return true;
+ }
+ return false;
+}
+
struct hw_vendor_info {
u16 valid;
char oem_id[ACPI_OEM_ID_SIZE];
@@ -952,6 +967,7 @@ struct hw_vendor_info {
/* Hardware vendor-specific info that has its own power management modes */
static struct hw_vendor_info vendor_info[] = {
{1, "HP ", "ProLiant"},
+ {1, "ORACLE", ""},
{0, "", ""},
};
@@ -969,12 +985,16 @@ static bool intel_pstate_platform_pwr_mgmt_exists(void)
!strncmp(hdr.oem_table_id, v_info->oem_table_id, ACPI_OEM_TABLE_ID_SIZE) &&
intel_pstate_no_acpi_pss())
return true;
+ if (!strncmp(hdr.oem_id, v_info->oem_id, ACPI_OEM_ID_SIZE) &&
+ intel_pstate_has_acpi_ppc())
+ return true;
}
return false;
}
#else /* CONFIG_ACPI not enabled */
static inline bool intel_pstate_platform_pwr_mgmt_exists(void) { return false; }
+static inline bool intel_pstate_has_acpi_ppc(void) { return false; }
#endif /* CONFIG_ACPI */
static int __init intel_pstate_init(void)
--
1.8.3.1
next prev parent reply other threads:[~2014-11-18 8:39 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-18 8:36 [PATCH 0/3] intel_pstate: allow to be built as module and handle Sun server power capping Ethan Zhao
2014-11-18 8:37 ` [PATCH 1/3] intel_pstate: skip the driver if Sun server has ACPI _PPC method Ethan Zhao
2014-11-19 20:22 ` Linda Knippers
2014-11-20 0:52 ` ethan
2014-11-20 16:50 ` Dirk Brandewie
2014-11-21 0:37 ` ethan zhao
2014-11-21 4:44 ` Linda Knippers
2014-11-24 1:41 ` ethan zhao
2014-11-24 15:54 ` Linda Knippers
2014-11-25 0:33 ` ethan
2014-11-18 8:37 ` [PATCH 2/3] intel_pstate: allow driver to be built as a module Ethan Zhao
2014-11-18 20:36 ` Rafael J. Wysocki
2014-11-18 8:37 ` [PATCH 3/3] intel_pstate: add module and kernel command line parameter to ignore ACPI _PPC Ethan Zhao
2014-11-18 8:37 ` [PATCH 0/3] intel_pstate: allow to be built as module and handle Sun server power capping Ethan Zhao
2014-11-18 8:37 ` Ethan Zhao [this message]
2014-11-19 14:59 ` [PATCH 1/3] intel_pstate: skip the driver if Sun server has ACPI _PPC method Dirk Brandewie
2014-11-20 1:07 ` ethan
2014-11-18 8:37 ` [PATCH 2/3] intel_pstate: allow driver to be built as a module Ethan Zhao
2014-11-19 18:58 ` Kristen Carlson Accardi
2014-11-20 1:01 ` ethan
2014-11-18 8:37 ` [PATCH 3/3] intel_pstate: add module and kernel command line parameter to ignore ACPI _PPC Ethan Zhao
2014-11-19 19:05 ` Kristen Carlson Accardi
2014-11-20 0:57 ` ethan
2014-11-20 21:23 ` Kristen Carlson Accardi
2014-11-21 3:07 ` Ethan Zhao
2014-11-21 5:00 ` Linda Knippers
2014-11-24 1:56 ` ethan zhao
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