linux-kernel - [Patch v1 4/8] platform/x86: intel_pmc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1516352307-20123-5-git-send-email-rajneesh.bhardwaj@intel.com>
Date:   Fri, 19 Jan 2018 14:28:23 +0530
From:   Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>
To:     platform-driver-x86@...r.kernel.org
Cc:     dvhart@...radead.org, andy@...radead.org,
        linux-kernel@...r.kernel.org, vishwanath.somayaji@...el.com,
        srinivas.pandruvada@...ux.intel.com,
        Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>
Subject: [Patch v1 4/8] platform/x86: intel_pmc_core: Read base address from LPIT

From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>

Read SLP_S0 address from ACPI LPIT table when present and use PMC
specific SLP_S0 offset to get the base address of PMC MMIO.

Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@...el.com>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 drivers/platform/x86/intel_pmc_core.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/intel_pmc_core.c b/drivers/platform/x86/intel_pmc_core.c
index f7616600e8ab..549ee5852d4f 100644
--- a/drivers/platform/x86/intel_pmc_core.c
+++ b/drivers/platform/x86/intel_pmc_core.c
@@ -20,6 +20,7 @@
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
+#include <linux/acpi.h>
 #include <linux/debugfs.h>
 #include <linux/delay.h>
 #include <linux/io.h>
@@ -455,6 +456,7 @@ static int __init pmc_core_probe(void)
 {
 	const struct x86_cpu_id *cpu_id;
 	struct pmc_dev *pmcdev = &pmc;
+	u64 slp_s0_addr;
 	int err;
 
 	cpu_id = x86_match_cpu(intel_pmc_core_ids);
@@ -462,7 +464,12 @@ static int __init pmc_core_probe(void)
 		return -ENODEV;
 
 	pmcdev->map = (struct pmc_reg_map *)cpu_id->driver_data;
-	pmcdev->base_addr = PMC_BASE_ADDR_DEFAULT;
+
+	if (lpit_read_residency_count_address(&slp_s0_addr))
+		pmcdev->base_addr = PMC_BASE_ADDR_DEFAULT;
+	else
+		pmcdev->base_addr = slp_s0_addr - pmcdev->map->slp_s0_offset;
+
 	pmcdev->regbase = ioremap(pmcdev->base_addr,
 				  pmcdev->map->regmap_length);
 	if (!pmcdev->regbase)
-- 
2.7.4