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From:   Tomas Winkler <tomas.winkler@intel.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Alexander Usyskin <alexander.usyskin@intel.com>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Paul Menzel <pmenzel@molgen.mpg.de>,
        Tomas Winkler <tomas.winkler@intel.com>
Subject: [char-misc for v4.5-rc2 2/2 V2] mei: avoid FW version request on Ibex Peak and earlier
Date:   Fri,  4 Oct 2019 21:17:22 +0300
Message-Id: <20191004181722.31374-1-tomas.winkler@intel.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

From: Alexander Usyskin <alexander.usyskin@intel.com>

The fixed MKHI client on PCH 6 gen platforms
does not support fw version retrieval.
The error is not fatal, but it fills up the kernel logs and
slows down the driver start.
This patch disables requesting FW version on GEN6 and earlier platforms.

Fixes warning:
[   15.964298] mei mei::55213584-9a29-4916-badf-0fb7ed682aeb:01: Could not read FW version
[   15.964301] mei mei::55213584-9a29-4916-badf-0fb7ed682aeb:01: version command failed -5

Cc: <stable@vger.kernel.org> +v4.18
Cc: Paul Menzel <pmenzel@molgen.mpg.de>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
V2: Drop offending debug message
 drivers/misc/mei/bus-fixup.c | 14 +++++++++++---
 drivers/misc/mei/hw-me.c     | 21 ++++++++++++++++++---
 drivers/misc/mei/hw-me.h     |  8 ++++++--
 drivers/misc/mei/mei_dev.h   |  4 ++++
 drivers/misc/mei/pci-me.c    | 10 +++++-----
 5 files changed, 44 insertions(+), 13 deletions(-)

diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index 32e9b1aed2ca..0a2b99e1af45 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -218,13 +218,21 @@ static void mei_mkhi_fix(struct mei_cl_device *cldev)
 {
 	int ret;
 
+	/* No need to enable the client if nothing is needed from it */
+	if (!cldev->bus->fw_f_fw_ver_supported &&
+	    !cldev->bus->hbm_f_os_supported)
+		return;
+
 	ret = mei_cldev_enable(cldev);
 	if (ret)
 		return;
 
-	ret = mei_fwver(cldev);
-	if (ret < 0)
-		dev_err(&cldev->dev, "FW version command failed %d\n", ret);
+	if (cldev->bus->fw_f_fw_ver_supported) {
+		ret = mei_fwver(cldev);
+		if (ret < 0)
+			dev_err(&cldev->dev, "FW version command failed %d\n",
+				ret);
+	}
 
 	if (cldev->bus->hbm_f_os_supported) {
 		ret = mei_osver(cldev);
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index abe1b1f4362f..c4f6991d3028 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -1355,6 +1355,8 @@ static bool mei_me_fw_type_sps(struct pci_dev *pdev)
 #define MEI_CFG_FW_SPS                           \
 	.quirk_probe = mei_me_fw_type_sps
 
+#define MEI_CFG_FW_VER_SUPP                     \
+	.fw_ver_supported = 1
 
 #define MEI_CFG_ICH_HFS                      \
 	.fw_status.count = 0
@@ -1392,31 +1394,41 @@ static const struct mei_cfg mei_me_ich10_cfg = {
 	MEI_CFG_ICH10_HFS,
 };
 
-/* PCH devices */
-static const struct mei_cfg mei_me_pch_cfg = {
+/* PCH6 devices */
+static const struct mei_cfg mei_me_pch6_cfg = {
 	MEI_CFG_PCH_HFS,
 };
 
+/* PCH7 devices */
+static const struct mei_cfg mei_me_pch7_cfg = {
+	MEI_CFG_PCH_HFS,
+	MEI_CFG_FW_VER_SUPP,
+};
+
 /* PCH Cougar Point and Patsburg with quirk for Node Manager exclusion */
 static const struct mei_cfg mei_me_pch_cpt_pbg_cfg = {
 	MEI_CFG_PCH_HFS,
+	MEI_CFG_FW_VER_SUPP,
 	MEI_CFG_FW_NM,
 };
 
 /* PCH8 Lynx Point and newer devices */
 static const struct mei_cfg mei_me_pch8_cfg = {
 	MEI_CFG_PCH8_HFS,
+	MEI_CFG_FW_VER_SUPP,
 };
 
 /* PCH8 Lynx Point with quirk for SPS Firmware exclusion */
 static const struct mei_cfg mei_me_pch8_sps_cfg = {
 	MEI_CFG_PCH8_HFS,
+	MEI_CFG_FW_VER_SUPP,
 	MEI_CFG_FW_SPS,
 };
 
 /* Cannon Lake and newer devices */
 static const struct mei_cfg mei_me_pch12_cfg = {
 	MEI_CFG_PCH8_HFS,
+	MEI_CFG_FW_VER_SUPP,
 	MEI_CFG_DMA_128,
 };
 
@@ -1428,7 +1440,8 @@ static const struct mei_cfg *const mei_cfg_list[] = {
 	[MEI_ME_UNDEF_CFG] = NULL,
 	[MEI_ME_ICH_CFG] = &mei_me_ich_cfg,
 	[MEI_ME_ICH10_CFG] = &mei_me_ich10_cfg,
-	[MEI_ME_PCH_CFG] = &mei_me_pch_cfg,
+	[MEI_ME_PCH6_CFG] = &mei_me_pch6_cfg,
+	[MEI_ME_PCH7_CFG] = &mei_me_pch7_cfg,
 	[MEI_ME_PCH_CPT_PBG_CFG] = &mei_me_pch_cpt_pbg_cfg,
 	[MEI_ME_PCH8_CFG] = &mei_me_pch8_cfg,
 	[MEI_ME_PCH8_SPS_CFG] = &mei_me_pch8_sps_cfg,
@@ -1473,6 +1486,8 @@ struct mei_device *mei_me_dev_init(struct pci_dev *pdev,
 	mei_device_init(dev, &pdev->dev, &mei_me_hw_ops);
 	hw->cfg = cfg;
 
+	dev->fw_f_fw_ver_supported = cfg->fw_ver_supported;
+
 	return dev;
 }
 
diff --git a/drivers/misc/mei/hw-me.h b/drivers/misc/mei/hw-me.h
index 08c84a0de4a8..1d8794828cbc 100644
--- a/drivers/misc/mei/hw-me.h
+++ b/drivers/misc/mei/hw-me.h
@@ -20,11 +20,13 @@
  * @fw_status: FW status
  * @quirk_probe: device exclusion quirk
  * @dma_size: device DMA buffers size
+ * @fw_ver_supported: is fw version retrievable from FW
  */
 struct mei_cfg {
 	const struct mei_fw_status fw_status;
 	bool (*quirk_probe)(struct pci_dev *pdev);
 	size_t dma_size[DMA_DSCR_NUM];
+	u32 fw_ver_supported:1;
 };
 
 
@@ -62,7 +64,8 @@ struct mei_me_hw {
  * @MEI_ME_UNDEF_CFG:      Lower sentinel.
  * @MEI_ME_ICH_CFG:        I/O Controller Hub legacy devices.
  * @MEI_ME_ICH10_CFG:      I/O Controller Hub platforms Gen10
- * @MEI_ME_PCH_CFG:        Platform Controller Hub platforms (Up to Gen8).
+ * @MEI_ME_PCH6_CFG:       Platform Controller Hub platforms (Gen6).
+ * @MEI_ME_PCH7_CFG:       Platform Controller Hub platforms (Gen7).
  * @MEI_ME_PCH_CPT_PBG_CFG:Platform Controller Hub workstations
  *                         with quirk for Node Manager exclusion.
  * @MEI_ME_PCH8_CFG:       Platform Controller Hub Gen8 and newer
@@ -77,7 +80,8 @@ enum mei_cfg_idx {
 	MEI_ME_UNDEF_CFG,
 	MEI_ME_ICH_CFG,
 	MEI_ME_ICH10_CFG,
-	MEI_ME_PCH_CFG,
+	MEI_ME_PCH6_CFG,
+	MEI_ME_PCH7_CFG,
 	MEI_ME_PCH_CPT_PBG_CFG,
 	MEI_ME_PCH8_CFG,
 	MEI_ME_PCH8_SPS_CFG,
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index f71a023aed3c..0f2141178299 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -426,6 +426,8 @@ struct mei_fw_version {
  *
  * @fw_ver : FW versions
  *
+ * @fw_f_fw_ver_supported : fw feature: fw version supported
+ *
  * @me_clients_rwsem: rw lock over me_clients list
  * @me_clients  : list of FW clients
  * @me_clients_map : FW clients bit map
@@ -506,6 +508,8 @@ struct mei_device {
 
 	struct mei_fw_version fw_ver[MEI_MAX_FW_VER_BLOCKS];
 
+	unsigned int fw_f_fw_ver_supported:1;
+
 	struct rw_semaphore me_clients_rwsem;
 	struct list_head me_clients;
 	DECLARE_BITMAP(me_clients_map, MEI_CLIENTS_MAX);
diff --git a/drivers/misc/mei/pci-me.c b/drivers/misc/mei/pci-me.c
index 775a2090c2ac..3dca63eddaa0 100644
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -61,13 +61,13 @@ static const struct pci_device_id mei_me_pci_tbl[] = {
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, MEI_ME_ICH10_CFG)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, MEI_ME_ICH10_CFG)},
 
-	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, MEI_ME_PCH_CFG)},
-	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, MEI_ME_PCH_CFG)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, MEI_ME_PCH6_CFG)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, MEI_ME_PCH6_CFG)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_CPT_1, MEI_ME_PCH_CPT_PBG_CFG)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_PBG_1, MEI_ME_PCH_CPT_PBG_CFG)},
-	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, MEI_ME_PCH_CFG)},
-	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, MEI_ME_PCH_CFG)},
-	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, MEI_ME_PCH_CFG)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, MEI_ME_PCH7_CFG)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, MEI_ME_PCH7_CFG)},
+	{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, MEI_ME_PCH7_CFG)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, MEI_ME_PCH8_SPS_CFG)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, MEI_ME_PCH8_SPS_CFG)},
 	{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, MEI_ME_PCH8_CFG)},
-- 
2.21.0