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Message-Id: <1396277964-25314-1-git-send-email-tomas.winkler@intel.com>
Date: Mon, 31 Mar 2014 17:59:23 +0300
From: Tomas Winkler <tomas.winkler@...el.com>
To: gregkh@...uxfoundation.org
Cc: arnd@...db.de, linux-kernel@...r.kernel.org,
Alexander Usyskin <alexander.usyskin@...el.com>,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next 1/2] mei: extract fw status registers
From: Alexander Usyskin <alexander.usyskin@...el.com>
Fetch FW status registers, as they are important in
in understanding of FW reset reasons
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
---
drivers/misc/mei/hw-me.c | 55 ++++++++++++++++++++++++++++++++++++++++++
drivers/misc/mei/hw-txe-regs.h | 2 +-
drivers/misc/mei/hw-txe.c | 37 +++++++++++++++++++++++++++-
drivers/misc/mei/init.c | 10 +++++---
drivers/misc/mei/mei_dev.h | 28 +++++++++++++++++++++
5 files changed, 127 insertions(+), 5 deletions(-)
diff --git a/drivers/misc/mei/hw-me.c b/drivers/misc/mei/hw-me.c
index 4b048b6..a31bc4c 100644
--- a/drivers/misc/mei/hw-me.c
+++ b/drivers/misc/mei/hw-me.c
@@ -696,10 +696,65 @@ end:
mutex_unlock(&dev->device_lock);
return IRQ_HANDLED;
}
+
+/**
+ * mei_me_fw_status - retrieve fw status from the pci config space
+ *
+ * @dev: the device structure
+ * @fw_status: fw status registers storage
+ *
+ * returns 0 on success an error code otherwise
+ */
+static int mei_me_fw_status(struct mei_device *dev,
+ struct mei_fw_status *fw_status)
+{
+ const u32 pci_cfg_reg[] = {PCI_CFG_HFS_1, PCI_CFG_HFS_2};
+ int i;
+
+ if (!fw_status)
+ return -EINVAL;
+
+ switch (dev->pdev->device) {
+ case MEI_DEV_ID_IBXPK_1:
+ case MEI_DEV_ID_IBXPK_2:
+ case MEI_DEV_ID_CPT_1:
+ case MEI_DEV_ID_PBG_1:
+ case MEI_DEV_ID_PPT_1:
+ case MEI_DEV_ID_PPT_2:
+ case MEI_DEV_ID_PPT_3:
+ case MEI_DEV_ID_LPT_H:
+ case MEI_DEV_ID_LPT_W:
+ case MEI_DEV_ID_LPT_LP:
+ case MEI_DEV_ID_LPT_HR:
+ case MEI_DEV_ID_WPT_LP:
+ fw_status->count = 2;
+ break;
+ case MEI_DEV_ID_ICH10_1:
+ case MEI_DEV_ID_ICH10_2:
+ case MEI_DEV_ID_ICH10_3:
+ case MEI_DEV_ID_ICH10_4:
+ fw_status->count = 1;
+ break;
+ default:
+ fw_status->count = 0;
+ break;
+ }
+
+ for (i = 0; i < fw_status->count && i < MEI_FW_STATUS_MAX; i++) {
+ int ret;
+ ret = pci_read_config_dword(dev->pdev,
+ pci_cfg_reg[i], &fw_status->status[i]);
+ if (ret)
+ return ret;
+ }
+ return 0;
+}
+
static const struct mei_hw_ops mei_me_hw_ops = {
.pg_state = mei_me_pg_state,
+ .fw_status = mei_me_fw_status,
.host_is_ready = mei_me_host_is_ready,
.hw_is_ready = mei_me_hw_is_ready,
diff --git a/drivers/misc/mei/hw-txe-regs.h b/drivers/misc/mei/hw-txe-regs.h
index 7283c24..f19229c 100644
--- a/drivers/misc/mei/hw-txe-regs.h
+++ b/drivers/misc/mei/hw-txe-regs.h
@@ -89,7 +89,7 @@ enum {
# define PCI_CFG_TXE_FW_STS0_ERR_CODE_MSK 0x0000F000
# define PCI_CFG_TXE_FW_STS0_OP_MODE_MSK 0x000F0000
# define PCI_CFG_TXE_FW_STS0_RST_CNT_MSK 0x00F00000
-
+#define PCI_CFG_TXE_FW_STS1 0x48
#define IPC_BASE_ADDR 0x80400 /* SeC IPC Base Address */
diff --git a/drivers/misc/mei/hw-txe.c b/drivers/misc/mei/hw-txe.c
index 4a6f567..455a6a5 100644
--- a/drivers/misc/mei/hw-txe.c
+++ b/drivers/misc/mei/hw-txe.c
@@ -620,7 +620,10 @@ static int mei_txe_write(struct mei_device *dev,
mei_txe_input_ready_interrupt_enable(dev);
if (!mei_txe_is_input_ready(dev)) {
- dev_err(&dev->pdev->dev, "Input is not ready");
+ struct mei_fw_status fw_status;
+ mei_fw_status(dev, &fw_status);
+ dev_err(&dev->pdev->dev, "Input is not ready " FW_STS_FMT "\n",
+ FW_STS_PRM(fw_status));
return -EAGAIN;
}
@@ -1039,8 +1042,40 @@ end:
return IRQ_HANDLED;
}
+
+/**
+ * mei_txe_fw_status - retrieve fw status from the pci config space
+ *
+ * @dev: the device structure
+ * @fw_status: fw status registers storage
+ *
+ * returns: 0 on success an error code otherwise
+ */
+static int mei_txe_fw_status(struct mei_device *dev,
+ struct mei_fw_status *fw_status)
+{
+ const u32 pci_cfg_reg[] = {PCI_CFG_TXE_FW_STS0, PCI_CFG_TXE_FW_STS1};
+ int i;
+
+ if (!fw_status)
+ return -EINVAL;
+
+ fw_status->count = 2;
+
+ for (i = 0; i < fw_status->count && i < MEI_FW_STATUS_MAX; i++) {
+ int ret;
+ ret = pci_read_config_dword(dev->pdev,
+ pci_cfg_reg[i], &fw_status->status[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
static const struct mei_hw_ops mei_txe_hw_ops = {
+ .fw_status = mei_txe_fw_status,
.host_is_ready = mei_txe_host_is_ready,
.pg_state = mei_txe_pg_state,
diff --git a/drivers/misc/mei/init.c b/drivers/misc/mei/init.c
index abc5ea0..b3f70eb 100644
--- a/drivers/misc/mei/init.c
+++ b/drivers/misc/mei/init.c
@@ -74,9 +74,13 @@ int mei_reset(struct mei_device *dev)
if (state != MEI_DEV_INITIALIZING &&
state != MEI_DEV_DISABLED &&
state != MEI_DEV_POWER_DOWN &&
- state != MEI_DEV_POWER_UP)
- dev_warn(&dev->pdev->dev, "unexpected reset: dev_state = %s\n",
- mei_dev_state_str(state));
+ state != MEI_DEV_POWER_UP) {
+ struct mei_fw_status fw_status;
+ mei_fw_status(dev, &fw_status);
+ dev_warn(&dev->pdev->dev,
+ "unexpected reset: dev_state = %s " FW_STS_FMT "\n",
+ mei_dev_state_str(state), FW_STS_PRM(fw_status));
+ }
/* we're already in reset, cancel the init timer
* if the reset was called due the hbm protocol error
diff --git a/drivers/misc/mei/mei_dev.h b/drivers/misc/mei/mei_dev.h
index beff9ef..1aaaf0b 100644
--- a/drivers/misc/mei/mei_dev.h
+++ b/drivers/misc/mei/mei_dev.h
@@ -153,6 +153,20 @@ struct mei_msg_data {
unsigned char *data;
};
+/* Maximum number of processed FW status registers */
+#define MEI_FW_STATUS_MAX 2
+
+/*
+ * struct mei_fw_status - storage of FW status data
+ *
+ * @count - number of actually available elements in array
+ * @status - FW status registers
+ */
+struct mei_fw_status {
+ int count;
+ u32 status[MEI_FW_STATUS_MAX];
+};
+
/**
* struct mei_me_client - representation of me (fw) client
*
@@ -213,6 +227,7 @@ struct mei_cl {
/** struct mei_hw_ops
*
+ * @fw_status - read FW status from PCI config space
* @host_is_ready - query for host readiness
* @hw_is_ready - query if hw is ready
@@ -240,6 +255,8 @@ struct mei_cl {
*/
struct mei_hw_ops {
+ int (*fw_status)(struct mei_device *dev,
+ struct mei_fw_status *fw_status);
bool (*host_is_ready)(struct mei_device *dev);
bool (*hw_is_ready)(struct mei_device *dev);
@@ -681,6 +698,17 @@ static inline int mei_count_full_read_slots(struct mei_device *dev)
return dev->ops->rdbuf_full_slots(dev);
}
+static inline int mei_fw_status(struct mei_device *dev,
+ struct mei_fw_status *fw_status)
+{
+ return dev->ops->fw_status(dev, fw_status);
+}
+
+#define FW_STS_FMT "%08X %08X"
+#define FW_STS_PRM(fw_status) \
+ (fw_status).count > 0 ? (fw_status).status[0] : 0xDEADBEEF, \
+ (fw_status).count > 1 ? (fw_status).status[1] : 0xDEADBEEF
+
bool mei_hbuf_acquire(struct mei_device *dev);
bool mei_write_is_idle(struct mei_device *dev);
--
1.9.0
--
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