* [PATCH V4 0/2] scsi: ufs: Add support to control UFS device background operations
@ 2013-07-23 7:08 Sujit Reddy Thumma
2013-07-23 7:08 ` [PATCH V4 1/2] scsi: ufs: Add support for host assisted " Sujit Reddy Thumma
2013-07-23 7:08 ` [PATCH V4 2/2] scsi: ufs: Add runtime PM support for UFS host controller driver Sujit Reddy Thumma
0 siblings, 2 replies; 3+ messages in thread
From: Sujit Reddy Thumma @ 2013-07-23 7:08 UTC (permalink / raw)
To: Vinayak Holikatti, Santosh Y
Cc: James E.J. Bottomley, linux-scsi, Sujit Reddy Thumma, linux-arm-msm
Add host assisted background operations for UFS device and runtime PM
helpers for ufshcd platform and pci glue drivers. The background operations
are disabled during runtime resume and enabled when the device is idle and
runtime suspended.
These patches depends on:
[PATCH V4 1/2] scsi: ufs: Add support for sending NOP OUT UPIU
[PATCH V4 2/2] scsi: ufs: Set fDeviceInit flag to initiate device initialization
Changes from v3:
- Addressed some of the comments by Seungwon Jeon on runtime PM.
Changes from v2:
- Enable auto bkops by default explicitly during bootup so that we
may not assume it as enabled after reset.
- Enable runtime PM support for contexts that are not part of SCSI,
so that the host is not suspended while running other contexts
like bkops exception handling.
Changes from v1:
- Minor cleanup and rebase
- Forced enable of auto bkops during initialization to make sure device
and driver state are matched.
Sujit Reddy Thumma (2):
scsi: ufs: Add support for host assisted background operations
scsi: ufs: Add runtime PM support for UFS host controller driver
drivers/scsi/ufs/ufs.h | 23 +++
drivers/scsi/ufs/ufshcd-pci.c | 62 ++++++-
drivers/scsi/ufs/ufshcd-pltfrm.c | 48 +++++-
drivers/scsi/ufs/ufshcd.c | 351 ++++++++++++++++++++++++++++++++++++++
drivers/scsi/ufs/ufshcd.h | 10 +
5 files changed, 487 insertions(+), 7 deletions(-)
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [PATCH V4 1/2] scsi: ufs: Add support for host assisted background operations
2013-07-23 7:08 [PATCH V4 0/2] scsi: ufs: Add support to control UFS device background operations Sujit Reddy Thumma
@ 2013-07-23 7:08 ` Sujit Reddy Thumma
2013-07-23 7:08 ` [PATCH V4 2/2] scsi: ufs: Add runtime PM support for UFS host controller driver Sujit Reddy Thumma
1 sibling, 0 replies; 3+ messages in thread
From: Sujit Reddy Thumma @ 2013-07-23 7:08 UTC (permalink / raw)
To: Vinayak Holikatti, Santosh Y
Cc: James E.J. Bottomley, linux-scsi, Sujit Reddy Thumma, linux-arm-msm
Background operations in the UFS device can be disabled by
the host to reduce the response latency of transfer requests.
Add support for enabling/disabling the background operations
during runtime suspend/resume of the device.
If the device is in critical need of BKOPS it will raise an
URGENT_BKOPS exception which should be handled by the host to
make sure the device performs as expected.
During bootup, the BKOPS is enabled in the device by default.
The disable of BKOPS is supported only when the driver supports
runtime suspend/resume operations as the runtime PM framework
provides a way to determine the device idleness and hence BKOPS
can be managed effectively. During runtime resume the BKOPS is
disabled to reduce latency and during runtime suspend the BKOPS
is enabled to allow device to carry out idle time BKOPS.
In some cases where the BKOPS is disabled during runtime resume
and due to continuous data transfers the runtime suspend is not
triggered, the BKOPS is enabled when the device raises a level-2
exception (outstanding operations - performance impact).
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
---
drivers/scsi/ufs/ufs.h | 23 +++
drivers/scsi/ufs/ufshcd.c | 343 +++++++++++++++++++++++++++++++++++++++++++++
drivers/scsi/ufs/ufshcd.h | 10 ++
3 files changed, 376 insertions(+), 0 deletions(-)
diff --git a/drivers/scsi/ufs/ufs.h b/drivers/scsi/ufs/ufs.h
index 50d32f1..bce09a6 100644
--- a/drivers/scsi/ufs/ufs.h
+++ b/drivers/scsi/ufs/ufs.h
@@ -107,6 +107,28 @@ enum {
/* Flag idn for Query Requests*/
enum flag_idn {
QUERY_FLAG_IDN_FDEVICEINIT = 0x01,
+ QUERY_FLAG_IDN_BKOPS_EN = 0x04,
+};
+
+/* Attribute idn for Query requests */
+enum attr_idn {
+ QUERY_ATTR_IDN_BKOPS_STATUS = 0x05,
+ QUERY_ATTR_IDN_EE_CONTROL = 0x0D,
+ QUERY_ATTR_IDN_EE_STATUS = 0x0E,
+};
+
+/* Exception event mask values */
+enum {
+ MASK_EE_STATUS = 0xFFFF,
+ MASK_EE_URGENT_BKOPS = (1 << 2),
+};
+
+/* Background operation status */
+enum {
+ BKOPS_STATUS_NO_OP = 0x0,
+ BKOPS_STATUS_NON_CRITICAL = 0x1,
+ BKOPS_STATUS_PERF_IMPACT = 0x2,
+ BKOPS_STATUS_CRITICAL = 0x3,
};
/* UTP QUERY Transaction Specific Fields OpCode */
@@ -155,6 +177,7 @@ enum {
MASK_TASK_RESPONSE = 0xFF00,
MASK_RSP_UPIU_RESULT = 0xFFFF,
MASK_QUERY_DATA_SEG_LEN = 0xFFFF,
+ MASK_RSP_EXCEPTION_EVENT = 0x10000,
};
/* Task management service response */
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 7b581f7..4267246 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -261,6 +261,21 @@ ufshcd_get_rsp_upiu_result(struct utp_upiu_rsp *ucd_rsp_ptr)
}
/**
+ * ufshcd_is_exception_event - Check if the device raised an exception event
+ * @ucd_rsp_ptr: pointer to response UPIU
+ *
+ * The function checks if the device raised an exception event indicated in
+ * the Device Information field of response UPIU.
+ *
+ * Returns true if exception is raised, false otherwise.
+ */
+static inline bool ufshcd_is_exception_event(struct utp_upiu_rsp *ucd_rsp_ptr)
+{
+ return be32_to_cpu(ucd_rsp_ptr->header.dword_2) &
+ MASK_RSP_EXCEPTION_EVENT ? true : false;
+}
+
+/**
* ufshcd_config_int_aggr - Configure interrupt aggregation values.
* Currently there is no use case where we want to configure
* interrupt aggregation dynamically. So to configure interrupt
@@ -1107,6 +1122,77 @@ out_unlock:
}
/**
+ * ufshcd_query_attr - API function for sending attribute requests
+ * hba: per-adapter instance
+ * opcode: attribute opcode
+ * idn: attribute idn to access
+ * index: index field
+ * selector: selector field
+ * attr_val: the attribute value after the query request completes
+ *
+ * Returns 0 for success, non-zero in case of failure
+*/
+int ufshcd_query_attr(struct ufs_hba *hba, enum query_opcode opcode,
+ enum attr_idn idn, u8 index, u8 selector, u32 *attr_val)
+{
+ struct ufs_query_req *request;
+ struct ufs_query_res *response;
+ int err;
+
+ BUG_ON(!hba);
+
+ if (!attr_val) {
+ dev_err(hba->dev, "%s: attribute value required for opcode 0x%x\n",
+ __func__, opcode);
+ err = -EINVAL;
+ goto out;
+ }
+
+ mutex_lock(&hba->dev_cmd.lock);
+ request = &hba->dev_cmd.query.request;
+ response = &hba->dev_cmd.query.response;
+ memset(request, 0, sizeof(struct ufs_query_req));
+ memset(response, 0, sizeof(struct ufs_query_res));
+
+ switch (opcode) {
+ case UPIU_QUERY_OPCODE_WRITE_ATTR:
+ request->query_func = UPIU_QUERY_FUNC_STANDARD_WRITE_REQUEST;
+ request->upiu_req.value = *attr_val;
+ break;
+ case UPIU_QUERY_OPCODE_READ_ATTR:
+ request->query_func = UPIU_QUERY_FUNC_STANDARD_READ_REQUEST;
+ break;
+ default:
+ dev_err(hba->dev, "%s: Expected query attr opcode but got = 0x%.2x\n",
+ __func__, opcode);
+ err = -EINVAL;
+ goto out_unlock;
+ }
+
+ request->upiu_req.opcode = opcode;
+ request->upiu_req.idn = idn;
+ request->upiu_req.index = index;
+ request->upiu_req.selector = selector;
+
+ /* Send query request */
+ err = ufshcd_exec_dev_cmd(hba, DEV_CMD_TYPE_QUERY,
+ QUERY_REQ_TIMEOUT);
+
+ if (err) {
+ dev_err(hba->dev, "%s: opcode 0x%.2x for idn %d failed, err = %d\n",
+ __func__, opcode, idn, err);
+ goto out_unlock;
+ }
+
+ *attr_val = response->upiu_res.value;
+
+out_unlock:
+ mutex_unlock(&hba->dev_cmd.lock);
+out:
+ return err;
+}
+
+/**
* ufshcd_memory_alloc - allocate memory for host memory space data structures
* @hba: per adapter instance
*
@@ -1772,6 +1858,9 @@ ufshcd_transfer_rsp_status(struct ufs_hba *hba, struct ufshcd_lrb *lrbp)
*/
scsi_status = result & MASK_SCSI_STATUS;
result = ufshcd_scsi_cmd_status(lrbp, scsi_status);
+
+ if (ufshcd_is_exception_event(lrbp->ucd_rsp_ptr))
+ schedule_work(&hba->eeh_work);
break;
case UPIU_TRANSACTION_REJECT_UPIU:
/* TODO: handle Reject UPIU Response */
@@ -1875,6 +1964,230 @@ static void ufshcd_transfer_req_compl(struct ufs_hba *hba)
}
/**
+ * ufshcd_disable_ee - disable exception event
+ * @hba: per-adapter instance
+ * @mask: exception event to disable
+ *
+ * Disables exception event in the device so that the EVENT_ALERT
+ * bit is not set.
+ *
+ * Returns zero on success, non-zero error value on failure.
+ */
+static int ufshcd_disable_ee(struct ufs_hba *hba, u16 mask)
+{
+ int err = 0;
+ u32 val;
+
+ if (!(hba->ee_ctrl_mask & mask))
+ goto out;
+
+ val = hba->ee_ctrl_mask & ~mask;
+ val &= 0xFFFF; /* 2 bytes */
+ err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
+ QUERY_ATTR_IDN_EE_CONTROL, 0, 0, &val);
+ if (!err)
+ hba->ee_ctrl_mask &= ~mask;
+out:
+ return err;
+}
+
+/**
+ * ufshcd_enable_ee - enable exception event
+ * @hba: per-adapter instance
+ * @mask: exception event to enable
+ *
+ * Enable corresponding exception event in the device to allow
+ * device to alert host in critical scenarios.
+ *
+ * Returns zero on success, non-zero error value on failure.
+ */
+static int ufshcd_enable_ee(struct ufs_hba *hba, u16 mask)
+{
+ int err = 0;
+ u32 val;
+
+ if (hba->ee_ctrl_mask & mask)
+ goto out;
+
+ val = hba->ee_ctrl_mask | mask;
+ val &= 0xFFFF; /* 2 bytes */
+ err = ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_WRITE_ATTR,
+ QUERY_ATTR_IDN_EE_CONTROL, 0, 0, &val);
+ if (!err)
+ hba->ee_ctrl_mask |= mask;
+out:
+ return err;
+}
+
+/**
+ * ufshcd_enable_auto_bkops - Allow device managed BKOPS
+ * @hba: per-adapter instance
+ *
+ * Allow device to manage background operations on its own. Enabling
+ * this might lead to inconsistent latencies during normal data transfers
+ * as the device is allowed to manage its own way of handling background
+ * operations.
+ *
+ * Returns zero on success, non-zero on failure.
+ */
+static int ufshcd_enable_auto_bkops(struct ufs_hba *hba)
+{
+ int err = 0;
+
+ if (hba->auto_bkops_enabled)
+ goto out;
+
+ err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_SET_FLAG,
+ QUERY_FLAG_IDN_BKOPS_EN, NULL);
+ if (err) {
+ dev_err(hba->dev, "%s: failed to enable bkops %d\n",
+ __func__, err);
+ goto out;
+ }
+
+ hba->auto_bkops_enabled = true;
+
+ /* No need of URGENT_BKOPS exception from the device */
+ err = ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
+ if (err)
+ dev_err(hba->dev, "%s: failed to disable exception event %d\n",
+ __func__, err);
+out:
+ return err;
+}
+
+/**
+ * ufshcd_disable_auto_bkops - block device in doing background operations
+ * @hba: per-adapter instance
+ *
+ * Disabling background operations improves command response latency but
+ * has drawback of device moving into critical state where the device is
+ * not-operable. Make sure to call ufshcd_enable_auto_bkops() whenever the
+ * host is idle so that BKOPS are managed effectively without any negative
+ * impacts.
+ *
+ * Returns zero on success, non-zero on failure.
+ */
+static int ufshcd_disable_auto_bkops(struct ufs_hba *hba)
+{
+ int err = 0;
+
+ if (!hba->auto_bkops_enabled)
+ goto out;
+
+ /*
+ * If host assisted BKOPs is to be enabled, make sure
+ * urgent bkops exception is allowed.
+ */
+ err = ufshcd_enable_ee(hba, MASK_EE_URGENT_BKOPS);
+ if (err) {
+ dev_err(hba->dev, "%s: failed to enable exception event %d\n",
+ __func__, err);
+ goto out;
+ }
+
+ err = ufshcd_query_flag(hba, UPIU_QUERY_OPCODE_CLEAR_FLAG,
+ QUERY_FLAG_IDN_BKOPS_EN, NULL);
+ if (err) {
+ dev_err(hba->dev, "%s: failed to disable bkops %d\n",
+ __func__, err);
+ ufshcd_disable_ee(hba, MASK_EE_URGENT_BKOPS);
+ goto out;
+ }
+
+ hba->auto_bkops_enabled = false;
+out:
+ return err;
+}
+
+/**
+ * ufshcd_force_reset_auto_bkops - force enable of auto bkops
+ * @hba: per adapter instance
+ *
+ * After a device reset the device may toggle the BKOPS_EN flag
+ * to default value. The s/w tracking variables should be updated
+ * as well. Do this by forcing enable of auto bkops.
+ */
+static void ufshcd_force_reset_auto_bkops(struct ufs_hba *hba)
+{
+ hba->auto_bkops_enabled = false;
+ hba->ee_ctrl_mask |= MASK_EE_URGENT_BKOPS;
+ ufshcd_enable_auto_bkops(hba);
+}
+
+static inline int ufshcd_get_bkops_status(struct ufs_hba *hba, u32 *status)
+{
+ return ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+ QUERY_ATTR_IDN_BKOPS_STATUS, 0, 0, status);
+}
+
+/**
+ * ufshcd_urgent_bkops - handle urgent bkops exception event
+ * @hba: per-adapter instance
+ *
+ * Enable fBackgroundOpsEn flag in the device to permit background
+ * operations.
+ */
+static int ufshcd_urgent_bkops(struct ufs_hba *hba)
+{
+ int err;
+ u32 status = 0;
+
+ err = ufshcd_get_bkops_status(hba, &status);
+ if (err) {
+ dev_err(hba->dev, "%s: failed to get BKOPS status %d\n",
+ __func__, err);
+ goto out;
+ }
+
+ status = status & 0xF;
+
+ /* handle only if status indicates performance impact or critical */
+ if (status >= BKOPS_STATUS_PERF_IMPACT)
+ err = ufshcd_enable_auto_bkops(hba);
+out:
+ return err;
+}
+
+static inline int ufshcd_get_ee_status(struct ufs_hba *hba, u32 *status)
+{
+ return ufshcd_query_attr(hba, UPIU_QUERY_OPCODE_READ_ATTR,
+ QUERY_ATTR_IDN_EE_STATUS, 0, 0, status);
+}
+
+/**
+ * ufshcd_exception_event_handler - handle exceptions raised by device
+ * @work: pointer to work data
+ *
+ * Read bExceptionEventStatus attribute from the device and handle the
+ * exception event accordingly.
+ */
+static void ufshcd_exception_event_handler(struct work_struct *work)
+{
+ struct ufs_hba *hba;
+ int err;
+ u32 status = 0;
+ hba = container_of(work, struct ufs_hba, eeh_work);
+
+ err = ufshcd_get_ee_status(hba, &status);
+ if (err) {
+ dev_err(hba->dev, "%s: failed to get exception status %d\n",
+ __func__, err);
+ goto out;
+ }
+
+ status &= hba->ee_ctrl_mask;
+ if (status & MASK_EE_URGENT_BKOPS) {
+ err = ufshcd_urgent_bkops(hba);
+ if (err)
+ dev_err(hba->dev, "%s: failed to handle urgent bkops %d\n",
+ __func__, err);
+ }
+out:
+ return;
+}
+
+/**
* ufshcd_fatal_err_handler - handle fatal errors
* @hba: per adapter instance
*/
@@ -2185,6 +2498,7 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie)
if (ret)
goto out;
+ ufshcd_force_reset_auto_bkops(hba);
scsi_scan_host(hba->host);
out:
return;
@@ -2249,6 +2563,34 @@ int ufshcd_resume(struct ufs_hba *hba)
}
EXPORT_SYMBOL_GPL(ufshcd_resume);
+int ufshcd_runtime_suspend(struct ufs_hba *hba)
+{
+ if (!hba)
+ return 0;
+
+ /*
+ * The device is idle with no requests in the queue,
+ * allow background operations.
+ */
+ return ufshcd_enable_auto_bkops(hba);
+}
+EXPORT_SYMBOL(ufshcd_runtime_suspend);
+
+int ufshcd_runtime_resume(struct ufs_hba *hba)
+{
+ if (!hba)
+ return 0;
+
+ return ufshcd_disable_auto_bkops(hba);
+}
+EXPORT_SYMBOL(ufshcd_runtime_resume);
+
+int ufshcd_runtime_idle(struct ufs_hba *hba)
+{
+ return 0;
+}
+EXPORT_SYMBOL(ufshcd_runtime_idle);
+
/**
* ufshcd_remove - de-allocate SCSI host and host memory space
* data structure memory
@@ -2339,6 +2681,7 @@ int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
/* Initialize work queues */
INIT_WORK(&hba->feh_workq, ufshcd_fatal_err_handler);
+ INIT_WORK(&hba->eeh_work, ufshcd_exception_event_handler);
/* Initialize UIC command mutex */
mutex_init(&hba->uic_cmd_mutex);
diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index 6d6fdeb..59c9c48 100644
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -178,9 +178,12 @@ struct ufs_dev_cmd {
* @tm_condition: condition variable for task management
* @ufshcd_state: UFSHCD states
* @intr_mask: Interrupt Mask Bits
+ * @ee_ctrl_mask: Exception event control mask
* @feh_workq: Work queue for fatal controller error handling
+ * @eeh_work: Worker to handle exception events
* @errors: HBA errors
* @dev_cmd: ufs device management command information
+ * @auto_bkops_enabled: to track whether bkops is enabled in device
*/
struct ufs_hba {
void __iomem *mmio_base;
@@ -218,15 +221,19 @@ struct ufs_hba {
u32 ufshcd_state;
u32 intr_mask;
+ u16 ee_ctrl_mask;
/* Work Queues */
struct work_struct feh_workq;
+ struct work_struct eeh_work;
/* HBA Errors */
u32 errors;
/* Device management request data */
struct ufs_dev_cmd dev_cmd;
+
+ bool auto_bkops_enabled;
};
#define ufshcd_writel(hba, val, reg) \
@@ -253,4 +260,7 @@ static inline void check_upiu_size(void)
GENERAL_UPIU_REQUEST_SIZE + QUERY_DESC_MAX_SIZE);
}
+extern int ufshcd_runtime_suspend(struct ufs_hba *hba);
+extern int ufshcd_runtime_resume(struct ufs_hba *hba);
+extern int ufshcd_runtime_idle(struct ufs_hba *hba);
#endif /* End of Header */
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation.
^ permalink raw reply related [flat|nested] 3+ messages in thread
* [PATCH V4 2/2] scsi: ufs: Add runtime PM support for UFS host controller driver
2013-07-23 7:08 [PATCH V4 0/2] scsi: ufs: Add support to control UFS device background operations Sujit Reddy Thumma
2013-07-23 7:08 ` [PATCH V4 1/2] scsi: ufs: Add support for host assisted " Sujit Reddy Thumma
@ 2013-07-23 7:08 ` Sujit Reddy Thumma
1 sibling, 0 replies; 3+ messages in thread
From: Sujit Reddy Thumma @ 2013-07-23 7:08 UTC (permalink / raw)
To: Vinayak Holikatti, Santosh Y
Cc: James E.J. Bottomley, linux-scsi, Sujit Reddy Thumma, linux-arm-msm
Add runtime PM helpers to suspend/resume UFS controller at runtime.
Enable runtime PM by default for pci and platform drivers as the
initialized hardware can suspend if it is not used after bootup.
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
---
drivers/scsi/ufs/ufshcd-pci.c | 62 ++++++++++++++++++++++++++++++++++----
drivers/scsi/ufs/ufshcd-pltfrm.c | 48 ++++++++++++++++++++++++++++-
drivers/scsi/ufs/ufshcd.c | 8 +++++
3 files changed, 111 insertions(+), 7 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd-pci.c b/drivers/scsi/ufs/ufshcd-pci.c
index 48be39a..57ea9dd 100644
--- a/drivers/scsi/ufs/ufshcd-pci.c
+++ b/drivers/scsi/ufs/ufshcd-pci.c
@@ -35,6 +35,7 @@
#include "ufshcd.h"
#include <linux/pci.h>
+#include <linux/pm_runtime.h>
#ifdef CONFIG_PM
/**
@@ -44,7 +45,7 @@
*
* Returns -ENOSYS
*/
-static int ufshcd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
+static int ufshcd_pci_suspend(struct device *dev)
{
/*
* TODO:
@@ -61,7 +62,7 @@ static int ufshcd_pci_suspend(struct pci_dev *pdev, pm_message_t state)
*
* Returns -ENOSYS
*/
-static int ufshcd_pci_resume(struct pci_dev *pdev)
+static int ufshcd_pci_resume(struct device *dev)
{
/*
* TODO:
@@ -71,8 +72,45 @@ static int ufshcd_pci_resume(struct pci_dev *pdev)
return -ENOSYS;
}
+#else
+#define ufshcd_pci_suspend NULL
+#define ufshcd_pci_resume NULL
#endif /* CONFIG_PM */
+#ifdef CONFIG_PM_RUNTIME
+static int ufshcd_pci_runtime_suspend(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_suspend(hba);
+}
+static int ufshcd_pci_runtime_resume(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_resume(hba);
+}
+static int ufshcd_pci_runtime_idle(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_idle(hba);
+}
+#else /* !CONFIG_PM_RUNTIME */
+#define ufshcd_pci_runtime_suspend NULL
+#define ufshcd_pci_runtime_resume NULL
+#define ufshcd_pci_runtime_idle NULL
+#endif /* CONFIG_PM_RUNTIME */
+
/**
* ufshcd_pci_shutdown - main function to put the controller in reset state
* @pdev: pointer to PCI device handle
@@ -91,6 +129,9 @@ static void ufshcd_pci_remove(struct pci_dev *pdev)
{
struct ufs_hba *hba = pci_get_drvdata(pdev);
+ pm_runtime_forbid(&pdev->dev);
+ pm_runtime_get_noresume(&pdev->dev);
+
disable_irq(pdev->irq);
ufshcd_remove(hba);
pci_release_regions(pdev);
@@ -168,6 +209,8 @@ ufshcd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
}
pci_set_drvdata(pdev, hba);
+ pm_runtime_put_noidle(&pdev->dev);
+ pm_runtime_allow(&pdev->dev);
return 0;
@@ -182,6 +225,14 @@ out_error:
return err;
}
+static const struct dev_pm_ops ufshcd_pci_pm_ops = {
+ .suspend = ufshcd_pci_suspend,
+ .resume = ufshcd_pci_resume,
+ .runtime_suspend = ufshcd_pci_runtime_suspend,
+ .runtime_resume = ufshcd_pci_runtime_resume,
+ .runtime_idle = ufshcd_pci_runtime_idle,
+};
+
static DEFINE_PCI_DEVICE_TABLE(ufshcd_pci_tbl) = {
{ PCI_VENDOR_ID_SAMSUNG, 0xC00C, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
{ } /* terminate list */
@@ -195,10 +246,9 @@ static struct pci_driver ufshcd_pci_driver = {
.probe = ufshcd_pci_probe,
.remove = ufshcd_pci_remove,
.shutdown = ufshcd_pci_shutdown,
-#ifdef CONFIG_PM
- .suspend = ufshcd_pci_suspend,
- .resume = ufshcd_pci_resume,
-#endif
+ .driver = {
+ .pm = &ufshcd_pci_pm_ops
+ },
};
module_pci_driver(ufshcd_pci_driver);
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index c42db40..cc957fc 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -34,6 +34,7 @@
*/
#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
#include "ufshcd.h"
@@ -87,6 +88,40 @@ static int ufshcd_pltfrm_resume(struct device *dev)
#define ufshcd_pltfrm_resume NULL
#endif
+#ifdef CONFIG_PM_RUNTIME
+static int ufshcd_pltfrm_runtime_suspend(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_suspend(hba);
+}
+static int ufshcd_pltfrm_runtime_resume(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_resume(hba);
+}
+static int ufshcd_pltfrm_runtime_idle(struct device *dev)
+{
+ struct ufs_hba *hba = dev_get_drvdata(dev);
+
+ if (!hba)
+ return 0;
+
+ return ufshcd_runtime_idle(hba);
+}
+#else /* !CONFIG_PM_RUNTIME */
+#define ufshcd_pltfrm_runtime_suspend NULL
+#define ufshcd_pltfrm_runtime_resume NULL
+#define ufshcd_pltfrm_runtime_idle NULL
+#endif /* CONFIG_PM_RUNTIME */
+
/**
* ufshcd_pltfrm_probe - probe routine of the driver
* @pdev: pointer to Platform device handle
@@ -122,14 +157,20 @@ static int ufshcd_pltfrm_probe(struct platform_device *pdev)
goto out;
}
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
err = ufshcd_init(dev, &hba, mmio_base, irq);
if (err) {
dev_err(dev, "Intialization failed\n");
- goto out;
+ goto out_disable_rpm;
}
platform_set_drvdata(pdev, hba);
+out_disable_rpm:
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_set_suspended(&pdev->dev);
out:
return err;
}
@@ -144,6 +185,8 @@ static int ufshcd_pltfrm_remove(struct platform_device *pdev)
{
struct ufs_hba *hba = platform_get_drvdata(pdev);
+ pm_runtime_get_sync(&(pdev)->dev);
+
disable_irq(hba->irq);
ufshcd_remove(hba);
return 0;
@@ -157,6 +200,9 @@ static const struct of_device_id ufs_of_match[] = {
static const struct dev_pm_ops ufshcd_dev_pm_ops = {
.suspend = ufshcd_pltfrm_suspend,
.resume = ufshcd_pltfrm_resume,
+ .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
+ .runtime_resume = ufshcd_pltfrm_runtime_resume,
+ .runtime_idle = ufshcd_pltfrm_runtime_idle,
};
static struct platform_driver ufshcd_pltfrm_driver = {
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 4267246..1f2caa0 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2169,6 +2169,7 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
u32 status = 0;
hba = container_of(work, struct ufs_hba, eeh_work);
+ pm_runtime_get_sync(hba->dev);
err = ufshcd_get_ee_status(hba, &status);
if (err) {
dev_err(hba->dev, "%s: failed to get exception status %d\n",
@@ -2184,6 +2185,7 @@ static void ufshcd_exception_event_handler(struct work_struct *work)
__func__, err);
}
out:
+ pm_runtime_put_sync(hba->dev);
return;
}
@@ -2196,9 +2198,11 @@ static void ufshcd_fatal_err_handler(struct work_struct *work)
struct ufs_hba *hba;
hba = container_of(work, struct ufs_hba, feh_workq);
+ pm_runtime_get_sync(hba->dev);
/* check if reset is already in progress */
if (hba->ufshcd_state != UFSHCD_STATE_RESET)
ufshcd_do_reset(hba);
+ pm_runtime_put_sync(hba->dev);
}
/**
@@ -2500,6 +2504,7 @@ static void ufshcd_async_scan(void *data, async_cookie_t cookie)
ufshcd_force_reset_auto_bkops(hba);
scsi_scan_host(hba->host);
+ pm_runtime_put_sync(hba->dev);
out:
return;
}
@@ -2721,6 +2726,9 @@ int ufshcd_init(struct device *dev, struct ufs_hba **hba_handle,
*hba_handle = hba;
+ /* Hold auto suspend until async scan completes */
+ pm_runtime_get_sync(dev);
+
async_schedule(ufshcd_async_scan, hba);
return 0;
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation.
^ permalink raw reply related [flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-07-23 7:08 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2013-07-23 7:08 [PATCH V4 0/2] scsi: ufs: Add support to control UFS device background operations Sujit Reddy Thumma
2013-07-23 7:08 ` [PATCH V4 1/2] scsi: ufs: Add support for host assisted " Sujit Reddy Thumma
2013-07-23 7:08 ` [PATCH V4 2/2] scsi: ufs: Add runtime PM support for UFS host controller driver Sujit Reddy Thumma
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