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* [PATCH v4 00/10] drivers/qcom: add RPMH communication support
@ 2018-03-09 23:25 Lina Iyer
  2018-03-09 23:25 ` [PATCH v4 01/10] drivers: qcom: rpmh-rsc: add RPMH controller for QCOM SoCs Lina Iyer
                   ` (9 more replies)
  0 siblings, 10 replies; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd, Lina Iyer

Changes in v4:
- Rename variables as suggested by Stephen and Evan
- Lot of minor syntax and style fixes
- Fix FTRACE compilation error
- Improve doc comments and DT description

Changes in v3:
- Address Steven's comments in FTRACE
- Fix DT documentation as suggested by Rob H
- Fix error handling in IRQ handler as suggested by Evan
- Remove locks in rpmh_flush()
- Improve comments

Changes in v2:
- Added sleep/wake, async and batch requests support
- Addressed Bjorn's comments
- Private FTRACE for drivers/soc/qcom as suggested by Steven
- Sparse checked on these patches
- Use SPDX license commenting sytle

This set of patches add the ability for platform drivers to make use of shared
resources in newer Qualcomm SoCs like SDM845. Resources that are shared between
multiple processors in a SoC are generally controlled by a dedicated remote
processor. The remote processor (Resource Power Manager or RPM in previous QCOM
SoCs) receives requests for resource state from other processors using the
shared resource, aggregates the request and applies the result on the shared
resource. SDM845 advances this concept and uses h/w (hardened I/P) blocks for
aggregating requests and applying the result on the resource. The resources
could be clocks, regulators or bandwidth requests for buses. This new
architecture is called RPM-hardened or RPMH in short.

Since this communication mechanism is completely hardware driven without a
processor intervention on the remote end, existing mechanisms like RPM-SMD are
no longer useful. Also, there is no serialization of data or is data is written
to a shared memory in this new format. The data used is different, unsigned 32
bits are used for representing an address, data and header. Each resource's
property is a unique u32 address and have pre-defined set of property specific
valid values. A request that comprises of <header, addr, data> is sent by
writing to a set of registers from Linux and transmitted to the remote slave
through an internal bus. The remote end aggregates this request along with
requests from other processors for the <addr> and applies the result.

The hardware block that houses this functionality is called Resource State
Coordinator or RSC. Inside the RSC are set of slots for sending RPMH requests
called Trigger Commands Sets (TCS). The set of patches are for writing the
requests into these TCSes and sending them to hardened IP blocks.

The driver design is split into two components. The RSC driver housed in
rpmh-rsc.c and the set of library functions in rpmh.c that frame the request and
transmit it using the controller. This first set of patches allow a simple
synchronous request to be made by the platform drivers. Future patches will add
more functionality that cater to complex drivers and use cases.

Please consider reviewing this patchset.

v1: https://www.spinics.net/lists/devicetree/msg210980.html
v2: https://lkml.org/lkml/2018/2/15/852
v3: https://lkml.org/lkml/2018/3/2/801

Lina Iyer (10):
  drivers: qcom: rpmh-rsc: add RPMH controller for QCOM SoCs
  dt-bindings: introduce RPMH RSC bindings for Qualcomm SoCs
  drivers: qcom: rpmh-rsc: log RPMH requests in FTRACE
  drivers: qcom: rpmh: add RPMH helper functions
  drivers: qcom: rpmh-rsc: write sleep/wake requests to TCS
  drivers: qcom: rpmh-rsc: allow invalidation of sleep/wake TCS
  drivers: qcom: rpmh: cache sleep/wake state requests
  drivers: qcom: rpmh: allow requests to be sent asynchronously
  drivers: qcom: rpmh: add support for batch RPMH request
  drivers: qcom: rpmh-rsc: allow active requests from wake TCS

 .../devicetree/bindings/soc/qcom/rpmh-rsc.txt      | 127 ++++
 drivers/soc/qcom/Kconfig                           |  10 +
 drivers/soc/qcom/Makefile                          |   4 +
 drivers/soc/qcom/rpmh-internal.h                   |  99 +++
 drivers/soc/qcom/rpmh-rsc.c                        | 768 +++++++++++++++++++++
 drivers/soc/qcom/rpmh.c                            | 659 ++++++++++++++++++
 drivers/soc/qcom/trace-rpmh.h                      |  89 +++
 include/dt-bindings/soc/qcom,rpmh-rsc.h            |  14 +
 include/soc/qcom/rpmh.h                            |  60 ++
 include/soc/qcom/tcs.h                             |  56 ++
 10 files changed, 1886 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
 create mode 100644 drivers/soc/qcom/rpmh-internal.h
 create mode 100644 drivers/soc/qcom/rpmh-rsc.c
 create mode 100644 drivers/soc/qcom/rpmh.c
 create mode 100644 drivers/soc/qcom/trace-rpmh.h
 create mode 100644 include/dt-bindings/soc/qcom,rpmh-rsc.h
 create mode 100644 include/soc/qcom/rpmh.h
 create mode 100644 include/soc/qcom/tcs.h

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply	[flat|nested] 17+ messages in thread

* [PATCH v4 01/10] drivers: qcom: rpmh-rsc: add RPMH controller for QCOM SoCs
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  2018-03-09 23:25 ` [PATCH v4 02/10] dt-bindings: introduce RPMH RSC bindings for Qualcomm SoCs Lina Iyer
                   ` (8 subsequent siblings)
  9 siblings, 0 replies; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd, Lina Iyer

Add controller driver for QCOM SoCs that have hardware based shared
resource management. The hardware IP known as RSC (Resource State
Coordinator) houses multiple Direct Resource Voter (DRV) for different
execution levels. A DRV is a unique voter on the state of a shared
resource. A Trigger Control Set (TCS) is a bunch of slots that can house
multiple resource state requests, that when triggered will issue those
requests through an internal bus to the Resource Power Manager Hardened
(RPMH) blocks. These hardware blocks are capable of adjusting clocks,
voltages, etc. The resource state request from a DRV are aggregated along
with state requests from other processors in the SoC and the aggregate
value is applied on the resource.

Some important aspects of the RPMH communication -
- Requests are <addr, value> with some header information
- Multiple requests (upto 16) may be sent through a TCS, at a time
- Requests in a TCS are sent in sequence
- Requests may be fire-n-forget or completion (response expected)
- Multiple TCS from the same DRV may be triggered simultaneously
- Cannot send a request if another requesit for the same addr is in
  progress from the same DRV
- When all the requests from a TCS are complete, an IRQ is raised
- The IRQ handler needs to clear the TCS before it is available for
  reuse
- TCS configuration is specific to a DRV
- Platform drivers may use DRV from different RSCs to make requests

Resource state requests made when CPUs are active are called 'active'
state requests. Requests made when all the CPUs are powered down (idle
state) are called 'sleep' state requests. They are matched by a
corresponding 'wake' state requests which puts the resources back in to
previously requested active state before resuming any CPU. TCSes are
dedicated for each type of requests. Control TCS are used to provide
specific information to the controller.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---

Changes in v4:
	- lots of variable name changes as suggested by Stephen B
	- use of const for data pointers
	- fix comments and other code syntax
	- use of bitmap for tcs_in_use instead of atomic
---
 drivers/soc/qcom/Kconfig                |  10 +
 drivers/soc/qcom/Makefile               |   1 +
 drivers/soc/qcom/rpmh-internal.h        |  89 +++++
 drivers/soc/qcom/rpmh-rsc.c             | 571 ++++++++++++++++++++++++++++++++
 include/dt-bindings/soc/qcom,rpmh-rsc.h |  14 +
 include/soc/qcom/tcs.h                  |  56 ++++
 6 files changed, 741 insertions(+)
 create mode 100644 drivers/soc/qcom/rpmh-internal.h
 create mode 100644 drivers/soc/qcom/rpmh-rsc.c
 create mode 100644 include/dt-bindings/soc/qcom,rpmh-rsc.h
 create mode 100644 include/soc/qcom/tcs.h

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index e050eb83341d..34f177bac8c8 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -55,6 +55,16 @@ config QCOM_RMTFS_MEM
 
 	  Say y here if you intend to boot the modem remoteproc.
 
+config QCOM_RPMH
+	bool "Qualcomm RPM-Hardened (RPMH) Communication"
+	depends on ARCH_QCOM && ARM64 && OF || COMPILE_TEST
+	help
+	  Support for communication with the hardened-RPM blocks in
+	  Qualcomm Technologies Inc (QTI) SoCs. RPMH communication uses an
+	  internal bus to transmit state requests for shared resources. A set
+	  of hardware components aggregate requests for these resources and
+	  help apply the aggregated state on the resource.
+
 config QCOM_SMEM
 	tristate "Qualcomm Shared Memory Manager (SMEM)"
 	depends on ARCH_QCOM
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index dcebf2814e6d..39d3a059ee50 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_QCOM_PM)	+=	spm.o
 obj-$(CONFIG_QCOM_QMI_HELPERS)	+= qmi_helpers.o
 qmi_helpers-y	+= qmi_encdec.o qmi_interface.o
 obj-$(CONFIG_QCOM_RMTFS_MEM)	+= rmtfs_mem.o
+obj-$(CONFIG_QCOM_RPMH)	+=	rpmh-rsc.o
 obj-$(CONFIG_QCOM_SMD_RPM)	+= smd-rpm.o
 obj-$(CONFIG_QCOM_SMEM) +=	smem.o
 obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h
new file mode 100644
index 000000000000..aa73ec4b3e42
--- /dev/null
+++ b/drivers/soc/qcom/rpmh-internal.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ */
+
+
+#ifndef __RPM_INTERNAL_H__
+#define __RPM_INTERNAL_H__
+
+#include <linux/bitmap.h>
+#include <soc/qcom/tcs.h>
+
+#define TCS_TYPE_NR			4
+#define MAX_CMDS_PER_TCS		16
+#define MAX_TCS_PER_TYPE		3
+#define MAX_TCS_NR			(MAX_TCS_PER_TYPE * TCS_TYPE_NR)
+
+struct rsc_drv;
+
+/**
+ * struct tcs_response: Response object for a request
+ *
+ * @drv:   the controller
+ * @msg:   the request for this response
+ * @m:     the tcs identifier
+ * @err:   error reported in the response
+ * @list:  element in list of pending response objects
+ */
+struct tcs_response {
+	struct rsc_drv *drv;
+	const struct tcs_request *msg;
+	u32 m;
+	int err;
+	struct list_head list;
+};
+
+/**
+ * struct tcs_group: group of Trigger Command Sets for a request state
+ *
+ * @drv:       the controller
+ * @type:      type of the TCS in this group - active, sleep, wake
+ * @mask:      mask of the TCSes relative to all the TCSes in the RSC
+ * @offset:    start of the TCS group relative to the TCSes in the RSC
+ * @num_tcs:   number of TCSes in this type
+ * @ncpt:      number of commands in each TCS
+ * @lock:      lock for synchronizing this TCS writes
+ * @responses: response objects for requests sent from each TCS
+ */
+struct tcs_group {
+	struct rsc_drv *drv;
+	int type;
+	u32 mask;
+	u32 offset;
+	int num_tcs;
+	int ncpt;
+	spinlock_t lock;
+	struct tcs_response *responses[MAX_TCS_PER_TYPE];
+};
+
+/**
+ * struct rsc_drv: the Resource State Coordinator controller
+ *
+ * @name:       controller identifier
+ * @tcs_base:   start address of the TCS registers in this controller
+ * @id:         instance id in the controller (Direct Resource Voter)
+ * @num_tcs:    number of TCSes in this DRV
+ * @tasklet:    handle responses, off-load work from IRQ handler
+ * @response_pending:
+ *              list of responses that needs to be sent to caller
+ * @tcs:        TCS groups
+ * @tcs_in_use: s/w state of the TCS
+ * @drv_lock:  synchronize state of the controller
+ */
+struct rsc_drv {
+	const char *name;
+	void __iomem *tcs_base;
+	int id;
+	int num_tcs;
+	struct tasklet_struct tasklet;
+	struct list_head response_pending;
+	struct tcs_group tcs[TCS_TYPE_NR];
+	DECLARE_BITMAP(tcs_in_use, MAX_TCS_NR);
+	spinlock_t drv_lock;
+};
+
+
+int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg);
+
+#endif /* __RPM_INTERNAL_H__ */
diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
new file mode 100644
index 000000000000..8bde1e9bd599
--- /dev/null
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -0,0 +1,571 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ */
+
+#define pr_fmt(fmt) "%s " fmt, KBUILD_MODNAME
+
+#include <linux/atomic.h>
+#include <linux/delay.h>
+#include <linux/export.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+
+#include <soc/qcom/tcs.h>
+#include <dt-bindings/soc/qcom,rpmh-rsc.h>
+
+#include "rpmh-internal.h"
+
+#define RSC_DRV_TCS_OFFSET		672
+#define RSC_DRV_CMD_OFFSET		20
+
+/* DRV Configuration Information Register */
+#define DRV_PRNT_CHLD_CONFIG		0x0C
+#define DRV_NUM_TCS_MASK		0x3F
+#define DRV_NUM_TCS_SHIFT		6
+#define DRV_NCPT_MASK			0x1F
+#define DRV_NCPT_SHIFT			27
+
+/* Register offsets */
+#define RSC_DRV_IRQ_ENABLE		0x00
+#define RSC_DRV_IRQ_STATUS		0x04
+#define RSC_DRV_IRQ_CLEAR		0x08
+#define RSC_DRV_CMD_WAIT_FOR_CMPL	0x10
+#define RSC_DRV_CONTROL			0x14
+#define RSC_DRV_STATUS			0x18
+#define RSC_DRV_CMD_ENABLE		0x1C
+#define RSC_DRV_CMD_MSGID		0x30
+#define RSC_DRV_CMD_ADDR		0x34
+#define RSC_DRV_CMD_DATA		0x38
+#define RSC_DRV_CMD_STATUS		0x3C
+#define RSC_DRV_CMD_RESP_DATA		0x40
+
+#define TCS_AMC_MODE_ENABLE		BIT(16)
+#define TCS_AMC_MODE_TRIGGER		BIT(24)
+
+/* TCS CMD register bit mask */
+#define CMD_MSGID_LEN			8
+#define CMD_MSGID_RESP_REQ		BIT(8)
+#define CMD_MSGID_WRITE			BIT(16)
+#define CMD_STATUS_ISSUED		BIT(8)
+#define CMD_STATUS_COMPL		BIT(16)
+
+static struct tcs_group *get_tcs_from_index(struct rsc_drv *drv, int m)
+{
+	struct tcs_group *tcs;
+	int i;
+
+	for (i = 0; i < drv->num_tcs; i++) {
+		tcs = &drv->tcs[i];
+		if (tcs->mask & BIT(m))
+			return tcs;
+	}
+
+	WARN(i == drv->num_tcs, "Incorrect TCS index %d", m);
+
+	return NULL;
+}
+
+static struct tcs_response *setup_response(struct rsc_drv *drv,
+					   const struct tcs_request *msg, int m)
+{
+	struct tcs_response *resp;
+	struct tcs_group *tcs;
+
+	resp = kzalloc(sizeof(*resp), GFP_ATOMIC);
+	if (!resp)
+		return ERR_PTR(-ENOMEM);
+
+	resp->drv = drv;
+	resp->msg = msg;
+	resp->err = 0;
+
+	tcs = get_tcs_from_index(drv, m);
+	if (!tcs)
+		return ERR_PTR(-EINVAL);
+
+	assert_spin_locked(&tcs->lock);
+	tcs->responses[m - tcs->offset] = resp;
+
+	return resp;
+}
+
+static void free_response(struct tcs_response *resp)
+{
+	kfree(resp);
+}
+
+static struct tcs_response *get_response(struct rsc_drv *drv, u32 m)
+{
+	struct tcs_group *tcs = get_tcs_from_index(drv, m);
+
+	return tcs->responses[m - tcs->offset];
+}
+
+static u32 read_tcs_reg(struct rsc_drv *drv, int reg, int m, int n)
+{
+	return readl_relaxed(drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * m +
+			     RSC_DRV_CMD_OFFSET * n);
+}
+
+static void write_tcs_reg(struct rsc_drv *drv, int reg, int m, int n, u32 data)
+{
+	writel_relaxed(data, drv->tcs_base + reg + RSC_DRV_TCS_OFFSET * m +
+		       RSC_DRV_CMD_OFFSET * n);
+}
+
+static void write_tcs_reg_sync(struct rsc_drv *drv, int reg, int m, int n,
+			       u32 data)
+{
+	write_tcs_reg(drv, reg, m, n, data);
+	for (;;) {
+		if (data == read_tcs_reg(drv, reg, m, n))
+			break;
+		udelay(1);
+	}
+}
+
+static bool tcs_is_free(struct rsc_drv *drv, int m)
+{
+	return !test_bit(m, drv->tcs_in_use) &&
+	       read_tcs_reg(drv, RSC_DRV_STATUS, m, 0);
+}
+
+static struct tcs_group *get_tcs_of_type(struct rsc_drv *drv, int type)
+{
+	int i;
+	struct tcs_group *tcs;
+
+	for (i = 0; i < TCS_TYPE_NR; i++) {
+		if (type == drv->tcs[i].type)
+			break;
+	}
+
+	if (i == TCS_TYPE_NR)
+		return ERR_PTR(-EINVAL);
+
+	tcs = &drv->tcs[i];
+	if (!tcs->num_tcs)
+		return ERR_PTR(-EINVAL);
+
+	return tcs;
+}
+
+static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv,
+					 const struct tcs_request *msg)
+{
+	int type;
+
+	switch (msg->state) {
+	case RPMH_ACTIVE_ONLY_STATE:
+		type = ACTIVE_TCS;
+		break;
+	default:
+		return ERR_PTR(-EINVAL);
+	}
+
+	return get_tcs_of_type(drv, type);
+}
+
+static void send_tcs_response(struct tcs_response *resp)
+{
+	struct rsc_drv *drv;
+	unsigned long flags;
+
+	if (!resp)
+		return;
+
+	drv = resp->drv;
+	spin_lock_irqsave(&drv->drv_lock, flags);
+	INIT_LIST_HEAD(&resp->list);
+	list_add_tail(&resp->list, &drv->response_pending);
+	spin_unlock_irqrestore(&drv->drv_lock, flags);
+
+	tasklet_schedule(&drv->tasklet);
+}
+
+/**
+ * tcs_irq_handler: TX Done interrupt handler
+ */
+static irqreturn_t tcs_irq_handler(int irq, void *p)
+{
+	struct rsc_drv *drv = p;
+	int m, i;
+	u32 irq_status, sts;
+	struct tcs_response *resp;
+	struct tcs_cmd *cmd;
+
+	irq_status = read_tcs_reg(drv, RSC_DRV_IRQ_STATUS, 0, 0);
+
+	for (m = 0; m < drv->num_tcs; m++) {
+		if (!(irq_status & (u32)BIT(m)))
+			continue;
+
+		resp = get_response(drv, m);
+		if (WARN_ON(!resp))
+			goto skip_resp;
+
+		resp->err = 0;
+		for (i = 0; i < resp->msg->num_cmds; i++) {
+			cmd = &resp->msg->cmds[i];
+			sts = read_tcs_reg(drv, RSC_DRV_CMD_STATUS, m, i);
+			if (!(sts & CMD_STATUS_ISSUED) ||
+			   ((resp->msg->wait_for_compl || cmd->wait) &&
+			   !(sts & CMD_STATUS_COMPL))) {
+				resp->err = -EIO;
+				break;
+			}
+		}
+skip_resp:
+		/* Reclaim the TCS */
+		write_tcs_reg(drv, RSC_DRV_CMD_ENABLE, m, 0, 0);
+		write_tcs_reg(drv, RSC_DRV_IRQ_CLEAR, 0, 0, BIT(m));
+		clear_bit(m, drv->tcs_in_use);
+		send_tcs_response(resp);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/**
+ * tcs_notify_tx_done: TX Done for requests that got a response
+ *
+ * @data: the tasklet argument
+ *
+ * Tasklet function to notify MBOX that we are done with the request.
+ * Handles all pending reponses whenever run.
+ */
+static void tcs_notify_tx_done(unsigned long data)
+{
+	struct rsc_drv *drv = (struct rsc_drv *)data;
+	struct tcs_response *resp;
+	unsigned long flags;
+
+	for (;;) {
+		spin_lock_irqsave(&drv->drv_lock, flags);
+		resp = list_first_entry_or_null(&drv->response_pending,
+						struct tcs_response, list);
+		if (!resp) {
+			spin_unlock_irqrestore(&drv->drv_lock, flags);
+			break;
+		}
+		list_del(&resp->list);
+		spin_unlock_irqrestore(&drv->drv_lock, flags);
+		free_response(resp);
+	}
+}
+
+static void __tcs_buffer_write(struct rsc_drv *drv, int m, int n,
+			       const struct tcs_request *msg)
+{
+	u32 msgid, cmd_msgid;
+	u32 cmd_enable = 0;
+	u32 cmd_complete;
+	struct tcs_cmd *cmd;
+	int i, j;
+
+	cmd_msgid = CMD_MSGID_LEN;
+	cmd_msgid |= msg->wait_for_compl ? CMD_MSGID_RESP_REQ : 0;
+	cmd_msgid |= CMD_MSGID_WRITE;
+
+	cmd_complete = read_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, m, 0);
+
+	for (i = 0, j = n; i < msg->num_cmds; i++, j++) {
+		cmd = &msg->cmds[i];
+		cmd_enable |= BIT(j);
+		cmd_complete |= cmd->wait << j;
+		msgid = cmd_msgid;
+		msgid |= cmd->wait ? CMD_MSGID_RESP_REQ : 0;
+		write_tcs_reg(drv, RSC_DRV_CMD_MSGID, m, j, msgid);
+		write_tcs_reg(drv, RSC_DRV_CMD_ADDR, m, j, cmd->addr);
+		write_tcs_reg(drv, RSC_DRV_CMD_DATA, m, j, cmd->data);
+	}
+
+	write_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, m, 0, cmd_complete);
+	cmd_enable |= read_tcs_reg(drv, RSC_DRV_CMD_ENABLE, m, 0);
+	write_tcs_reg(drv, RSC_DRV_CMD_ENABLE, m, 0, cmd_enable);
+}
+
+static void __tcs_trigger(struct rsc_drv *drv, int m)
+{
+	u32 enable;
+
+	/*
+	 * HW req: Clear the DRV_CONTROL and enable TCS again
+	 * While clearing ensure that the AMC mode trigger is cleared
+	 * and then the mode enable is cleared.
+	 */
+	enable = read_tcs_reg(drv, RSC_DRV_CONTROL, m, 0);
+	enable &= ~TCS_AMC_MODE_TRIGGER;
+	write_tcs_reg_sync(drv, RSC_DRV_CONTROL, m, 0, enable);
+	enable &= ~TCS_AMC_MODE_ENABLE;
+	write_tcs_reg_sync(drv, RSC_DRV_CONTROL, m, 0, enable);
+
+	/* Enable the AMC mode on the TCS and then trigger the TCS */
+	enable = TCS_AMC_MODE_ENABLE;
+	write_tcs_reg_sync(drv, RSC_DRV_CONTROL, m, 0, enable);
+	enable |= TCS_AMC_MODE_TRIGGER;
+	write_tcs_reg_sync(drv, RSC_DRV_CONTROL, m, 0, enable);
+}
+
+static int check_for_req_inflight(struct rsc_drv *drv, struct tcs_group *tcs,
+				  const struct tcs_request *msg)
+{
+	unsigned long curr_enabled;
+	u32 addr;
+	int i, j, k;
+	int m = tcs->offset;
+
+	for (i = 0; i < tcs->num_tcs; i++, m++) {
+		if (tcs_is_free(drv, m))
+			continue;
+
+		curr_enabled = read_tcs_reg(drv, RSC_DRV_CMD_ENABLE, m, 0);
+
+		for_each_set_bit(j, &curr_enabled, MAX_CMDS_PER_TCS) {
+			addr = read_tcs_reg(drv, RSC_DRV_CMD_ADDR, m, j);
+			for (k = 0; k < msg->num_cmds; k++) {
+				if (addr == msg->cmds[k].addr)
+					return -EBUSY;
+			}
+		}
+	}
+
+	return 0;
+}
+
+static int find_free_tcs(struct tcs_group *tcs)
+{
+	int m;
+
+	for (m = 0; m < tcs->num_tcs; m++) {
+		if (tcs_is_free(tcs->drv, tcs->offset + m))
+			return m;
+	}
+
+	return -EBUSY;
+}
+
+static int tcs_mbox_write(struct rsc_drv *drv, const struct tcs_request *msg)
+{
+	struct tcs_group *tcs;
+	int m;
+	struct tcs_response *resp = NULL;
+	unsigned long flags;
+	int ret;
+
+	tcs = get_tcs_for_msg(drv, msg);
+	if (IS_ERR(tcs))
+		return PTR_ERR(tcs);
+
+	spin_lock_irqsave(&tcs->lock, flags);
+	m = find_free_tcs(tcs);
+	if (m < 0) {
+		ret = m;
+		goto done_write;
+	}
+
+	/*
+	 * The h/w does not like if we send a request to the same address,
+	 * when one is already in-flight or being processed.
+	 */
+	ret = check_for_req_inflight(drv, tcs, msg);
+	if (ret)
+		goto done_write;
+
+	resp = setup_response(drv, msg, m);
+	if (IS_ERR(resp)) {
+		ret = PTR_ERR(resp);
+		goto done_write;
+	}
+	resp->m = m;
+
+	set_bit(m, drv->tcs_in_use);
+	__tcs_buffer_write(drv, m, 0, msg);
+	__tcs_trigger(drv, m);
+
+done_write:
+	spin_unlock_irqrestore(&tcs->lock, flags);
+	return ret;
+}
+
+/**
+ * rpmh_rsc_send_data: Validate the incoming message and write to the
+ * appropriate TCS block.
+ *
+ * @drv: the controller
+ * @msg: the data to be sent
+ *
+ * Return: 0 on success, -EINVAL on error.
+ * Note: This call blocks until a valid data is written to the TCS.
+ */
+int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg)
+{
+	int ret;
+
+	if (!msg || !msg->cmds || !msg->num_cmds ||
+	    msg->num_cmds > MAX_RPMH_PAYLOAD)
+		return -EINVAL;
+
+	do {
+		ret = tcs_mbox_write(drv, msg);
+		if (ret == -EBUSY) {
+			pr_info_ratelimited("TCS Busy, retrying RPMH message send: addr=%#x\n",
+					    msg->cmds[0].addr);
+			udelay(10);
+		}
+	} while (ret == -EBUSY);
+
+	return ret;
+}
+EXPORT_SYMBOL(rpmh_rsc_send_data);
+
+static int rpmh_probe_tcs_config(struct platform_device *pdev,
+				 struct rsc_drv *drv)
+{
+	struct tcs_type_config {
+		u32 type;
+		u32 n;
+	} tcs_cfg[TCS_TYPE_NR] = { { 0 } };
+	struct device_node *dn = pdev->dev.of_node;
+	u32 config, max_tcs, ncpt;
+	int i, ret, n, st = 0;
+	struct tcs_group *tcs;
+	struct resource *res;
+	void __iomem *base;
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "drv");
+	base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "tcs");
+	drv->tcs_base = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(drv->tcs_base))
+		return PTR_ERR(drv->tcs_base);
+
+	config = readl_relaxed(base + DRV_PRNT_CHLD_CONFIG);
+
+	max_tcs = config;
+	max_tcs &= DRV_NUM_TCS_MASK << (DRV_NUM_TCS_SHIFT * drv->id);
+	max_tcs = max_tcs >> (DRV_NUM_TCS_SHIFT * drv->id);
+
+	ncpt = config & (DRV_NCPT_MASK << DRV_NCPT_SHIFT);
+	ncpt = ncpt >> DRV_NCPT_SHIFT;
+
+	n = of_property_count_u32_elems(dn, "qcom,tcs-config");
+	if (n != 2 * TCS_TYPE_NR)
+		return -EINVAL;
+
+	for (i = 0; i < TCS_TYPE_NR; i++) {
+		ret = of_property_read_u32_index(dn, "qcom,tcs-config",
+						 i * 2, &tcs_cfg[i].type);
+		if (ret)
+			return ret;
+		if (tcs_cfg[i].type >= TCS_TYPE_NR)
+			return -EINVAL;
+
+		ret = of_property_read_u32_index(dn, "qcom,tcs-config",
+						 i * 2 + 1, &tcs_cfg[i].n);
+		if (ret)
+			return ret;
+		if (tcs_cfg[i].n > MAX_TCS_PER_TYPE)
+			return -EINVAL;
+	}
+
+	for (i = 0; i < TCS_TYPE_NR; i++) {
+		tcs = &drv->tcs[tcs_cfg[i].type];
+		if (tcs->drv)
+			return -EINVAL;
+		tcs->drv = drv;
+		tcs->type = tcs_cfg[i].type;
+		tcs->num_tcs = tcs_cfg[i].n;
+		tcs->ncpt = ncpt;
+		spin_lock_init(&tcs->lock);
+
+		if (!tcs->num_tcs || tcs->type == CONTROL_TCS)
+			continue;
+
+		if (st + tcs->num_tcs > max_tcs ||
+		    st + tcs->num_tcs >= BITS_PER_BYTE * sizeof(tcs->mask))
+			return -EINVAL;
+
+		tcs->mask = ((1 << tcs->num_tcs) - 1) << st;
+		tcs->offset = st;
+		st += tcs->num_tcs;
+	}
+
+	drv->num_tcs = st;
+
+	return 0;
+}
+
+static int rpmh_rsc_probe(struct platform_device *pdev)
+{
+	struct device_node *dn = pdev->dev.of_node;
+	struct rsc_drv *drv;
+	int ret, irq;
+
+	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
+	if (!drv)
+		return -ENOMEM;
+
+	ret = of_property_read_u32(dn, "qcom,drv-id", &drv->id);
+	if (ret)
+		return ret;
+
+	drv->name = of_get_property(dn, "label", NULL);
+	if (!drv->name)
+		drv->name = dev_name(&pdev->dev);
+
+	ret = rpmh_probe_tcs_config(pdev, drv);
+	if (ret)
+		return ret;
+
+	INIT_LIST_HEAD(&drv->response_pending);
+	spin_lock_init(&drv->drv_lock);
+	tasklet_init(&drv->tasklet, tcs_notify_tx_done, (unsigned long)drv);
+	bitmap_zero(drv->tcs_in_use, MAX_TCS_NR);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ret = devm_request_irq(&pdev->dev, irq, tcs_irq_handler,
+			       IRQF_TRIGGER_HIGH | IRQF_NO_SUSPEND,
+			       drv->name, drv);
+	if (ret)
+		return ret;
+
+	/* Enable the active TCS to send requests immediately */
+	write_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, 0, drv->tcs[ACTIVE_TCS].mask);
+
+	return devm_of_platform_populate(&pdev->dev);
+}
+
+static const struct of_device_id rpmh_drv_match[] = {
+	{ .compatible = "qcom,rpmh-rsc", },
+	{ }
+};
+
+static struct platform_driver rpmh_driver = {
+	.probe = rpmh_rsc_probe,
+	.driver = {
+		  .name = "rpmh",
+		  .of_match_table = rpmh_drv_match,
+	},
+};
+
+static int __init rpmh_driver_init(void)
+{
+	return platform_driver_register(&rpmh_driver);
+}
+arch_initcall(rpmh_driver_init);
diff --git a/include/dt-bindings/soc/qcom,rpmh-rsc.h b/include/dt-bindings/soc/qcom,rpmh-rsc.h
new file mode 100644
index 000000000000..868f998ea998
--- /dev/null
+++ b/include/dt-bindings/soc/qcom,rpmh-rsc.h
@@ -0,0 +1,14 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef __DT_QCOM_RPMH_RSC_H__
+#define __DT_QCOM_RPMH_RSC_H__
+
+#define SLEEP_TCS	0
+#define WAKE_TCS	1
+#define ACTIVE_TCS	2
+#define CONTROL_TCS	3
+
+#endif /* __DT_QCOM_RPMH_RSC_H__ */
diff --git a/include/soc/qcom/tcs.h b/include/soc/qcom/tcs.h
new file mode 100644
index 000000000000..4b78f881010a
--- /dev/null
+++ b/include/soc/qcom/tcs.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef __SOC_QCOM_TCS_H__
+#define __SOC_QCOM_TCS_H__
+
+#define MAX_RPMH_PAYLOAD	16
+
+/**
+ * rpmh_state: state for the request
+ *
+ * RPMH_SLEEP_STATE:       State of the resource when the processor subsystem
+ *                         is powered down. There is no client using the
+ *                         resource actively.
+ * RPMH_WAKE_ONLY_STATE:   Resume resource state to the value previously
+ *                         requested before the processor was powered down.
+ * RPMH_ACTIVE_ONLY_STATE: Active or AMC mode requests. Resource state
+ *                         is aggregated immediately.
+ */
+enum rpmh_state {
+	RPMH_SLEEP_STATE,
+	RPMH_WAKE_ONLY_STATE,
+	RPMH_ACTIVE_ONLY_STATE,
+};
+
+/**
+ * struct tcs_cmd: an individual request to RPMH.
+ *
+ * @addr: the address of the resource slv_id:18:16 | offset:0:15
+ * @data: the resource state request
+ * @wait: wait for this request to be complete before sending the next
+ */
+struct tcs_cmd {
+	u32 addr;
+	u32 data;
+	bool wait;
+};
+
+/**
+ * struct tcs_request: A set of tcs_cmds sent together in a TCS
+ *
+ * @state:          state for the request.
+ * @wait_for_compl: wait until we get a response from the h/w accelerator
+ * @num_cmds:       the number of @cmds in this request
+ * @cmds:           an array of tcs_cmds
+ */
+struct tcs_request {
+	enum rpmh_state state;
+	bool wait_for_compl;
+	u32 num_cmds;
+	struct tcs_cmd *cmds;
+};
+
+#endif /* __SOC_QCOM_TCS_H__ */
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* [PATCH v4 02/10] dt-bindings: introduce RPMH RSC bindings for Qualcomm SoCs
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
  2018-03-09 23:25 ` [PATCH v4 01/10] drivers: qcom: rpmh-rsc: add RPMH controller for QCOM SoCs Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  2018-03-26 22:22   ` Rob Herring
  2018-03-09 23:25 ` [PATCH v4 03/10] drivers: qcom: rpmh-rsc: log RPMH requests in FTRACE Lina Iyer
                   ` (7 subsequent siblings)
  9 siblings, 1 reply; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd,
	Lina Iyer, devicetree

Add device binding documentation for Qualcomm Technology Inc's RPMH RSC
driver. The driver is used for communicating resource state requests for
shared resources.

Cc: devicetree@vger.kernel.org
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---

Changes in v3:
	- Move to soc/qcom
	- Amend text per Stephen's suggestions

Changes in v2:
	- Amend text to describe the registers in reg property
	- Add reg-names for the registers
	- Update examples to use GIC_SPI in interrupts instead of 0
	- Rephrase incorrect description

Changes in v3:
	- Fix unwanted capitalization
	- Remove clients from the examples, this doc does not describe
	  them
	- Rephrase introductory paragraph
	- Remove hardware specifics from DT bindings
---
 .../devicetree/bindings/soc/qcom/rpmh-rsc.txt      | 127 +++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt

diff --git a/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt b/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
new file mode 100644
index 000000000000..dcf71a5b302f
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
@@ -0,0 +1,127 @@
+RPMH RSC:
+------------
+
+Resource Power Manager Hardened (RPMH) is the mechanism for communicating with
+the hardened resource accelerators on Qualcomm SoCs. Requests to the resources
+can be written to the Trigger Command Set (TCS)  registers and using a (addr,
+val) pair and triggered. Messages in the TCS are then sent in sequence over an
+internal bus.
+
+The hardware block (Direct Resource Voter or DRV) is a part of the h/w entity
+(Resource State Coordinator a.k.a RSC) that can handle a multiple sleep and
+active/wake resource requests. Multiple such DRVs can exist in a SoC and can
+be written to from Linux. The structure of each DRV follows the same template
+with a few variations that are captured by the properties here.
+
+A TCS may be triggered from Linux or triggered by the F/W after all the CPUs
+have powered off to facilitate idle power saving. TCS could be classified as -
+
+	SLEEP,  /* Triggered by F/W */
+	WAKE,   /* Triggered by F/W */
+	ACTIVE, /* Triggered by Linux */
+	CONTROL /* Triggered by F/W */
+
+The order in which they are described in the DT, should match the hardware
+configuration.
+
+Requests can be made for the state of a resource, when the subsystem is active
+or idle. When all subsystems like Modem, GPU, CPU are idle, the resource state
+will be an aggregate of the sleep votes from each of those subsystems. Clients
+may request a sleep value for their shared resources in addition to the active
+mode requests.
+
+Properties:
+
+- compatible:
+	Usage: required
+	Value type: <string>
+	Definition: Should be "qcom,rpmh-rsc".
+
+- reg:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: The first register specifies the base address of the DRV.
+	            The second register specifies the start address of the
+	            TCS.
+
+- reg-names:
+	Usage: required
+	Value type: <string>
+	Definition: Maps the register specified in the reg property. Must be
+	            "drv" and "tcs".
+
+- interrupts:
+	Usage: required
+	Value type: <prop-encoded-interrupt>
+	Definition: The interrupt that trips when a message complete/response
+	           is received for this DRV from the accelerators.
+
+- qcom,drv-id:
+	Usage: required
+	Value type: <u32>
+	Definition: the id of the DRV in the RSC block.
+
+- qcom,tcs-config:
+	Usage: required
+	Value type: <prop-encoded-array>
+	Definition: the tuple defining the configuration of TCS.
+	            Must have 2 cells which describe each TCS type.
+	            <type number_of_tcs>.
+	            The order of the TCS must match the hardware
+	            configuration.
+	- Cell #1 (TCS Type): TCS types to be specified -
+	            SLEEP_TCS
+	            WAKE_TCS
+	            ACTIVE_TCS
+	            CONTROL_TCS
+	- Cell #2 (Number of TCS): <u32>
+
+- label:
+	Usage: optional
+	Value type: <string>
+	Definition: Name for the RSC. The name would be used in trace logs.
+
+Drivers that want to use the RSC to communicate with RPMH must specify their
+bindings as child of the RSC controllers they wish to communicate with.
+
+Example 1:
+
+For a TCS whose RSC base address is is 0x179C0000 and is at a DRV id of 2, the
+register offsets for DRV2 start at 0D00, the register calculations are like
+this -
+First tuple: 0x179C0000 + 0x10000 * 2 = 0x179E0000
+Second tuple: 0x179E0000 + 0xD00 = 0x179E0D00
+
+	apps_rsc: rsc@179e000 {
+		label = "apps_rsc";
+		compatible = "qcom,rpmh-rsc";
+		reg = <0x179e0000 0x10000>, <0x179e0d00 0x3000>;
+		reg-names = "drv", "tcs";
+		interrupts = <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>;
+		qcom,drv-id = <2>;
+		qcom,tcs-config = <SLEEP_TCS   3>,
+				  <WAKE_TCS    3>,
+				  <ACTIVE_TCS  2>,
+				  <CONTROL_TCS 1>;
+	};
+
+Example 2:
+
+For a TCS whose RSC base address is 0xAF20000 and is at DRV id of 0, the
+register offsets for DRV0 start at 01C00, the register calculations are like
+this -
+First tuple: 0xAF20000
+Second tuple: 0xAF20000 + 0x1C00 = 0xAF21C00
+
+	disp_rsc: rsc@af20000 {
+		label = "disp_rsc";
+		compatible = "qcom,rpmh-rsc";
+		reg = <0xaf20000 0x10000>, <0xaf21c00 0x3000>;
+		reg-names = "drv", "tcs";
+		interrupts = <GIC_SPI 129 IRQ_TYPE_LEVEL_HIGH>;
+		qcom,drv-id = <0>;
+		qcom,tcs-config = <SLEEP_TCS   1>,
+				  <WAKE_TCS    1>,
+				  <ACTIVE_TCS  0>,
+				  <CONTROL_TCS 0>;
+	};
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* [PATCH v4 03/10] drivers: qcom: rpmh-rsc: log RPMH requests in FTRACE
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
  2018-03-09 23:25 ` [PATCH v4 01/10] drivers: qcom: rpmh-rsc: add RPMH controller for QCOM SoCs Lina Iyer
  2018-03-09 23:25 ` [PATCH v4 02/10] dt-bindings: introduce RPMH RSC bindings for Qualcomm SoCs Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  2018-03-09 23:52   ` Steven Rostedt
  2018-03-09 23:25 ` [PATCH v4 04/10] drivers: qcom: rpmh: add RPMH helper functions Lina Iyer
                   ` (6 subsequent siblings)
  9 siblings, 1 reply; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd,
	Lina Iyer, Steven Rostedt

Log sent RPMH requests and interrupt responses in FTRACE.

Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---

Changes in v4:
	- fix compilation issues, use __assign_str
	- use %#x instead of 0x%08x
Changes in v3:
	- Use __string() instead of char *
	- fix TRACE_INCLUDE_PATH
---
 drivers/soc/qcom/Makefile     |  1 +
 drivers/soc/qcom/rpmh-rsc.c   |  6 +++
 drivers/soc/qcom/trace-rpmh.h | 89 +++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 96 insertions(+)
 create mode 100644 drivers/soc/qcom/trace-rpmh.h

diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 39d3a059ee50..cb6300f6a8e9 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0
+CFLAGS_rpmh-rsc.o := -I$(src)
 obj-$(CONFIG_QCOM_GLINK_SSR) +=	glink_ssr.o
 obj-$(CONFIG_QCOM_GSBI)	+=	qcom_gsbi.o
 obj-$(CONFIG_QCOM_MDT_LOADER)	+= mdt_loader.o
diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index 8bde1e9bd599..f604101a4fc2 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -24,6 +24,9 @@
 
 #include "rpmh-internal.h"
 
+#define CREATE_TRACE_POINTS
+#include "trace-rpmh.h"
+
 #define RSC_DRV_TCS_OFFSET		672
 #define RSC_DRV_CMD_OFFSET		20
 
@@ -228,6 +231,7 @@ static irqreturn_t tcs_irq_handler(int irq, void *p)
 		/* Reclaim the TCS */
 		write_tcs_reg(drv, RSC_DRV_CMD_ENABLE, m, 0, 0);
 		write_tcs_reg(drv, RSC_DRV_IRQ_CLEAR, 0, 0, BIT(m));
+		trace_rpmh_notify_irq(drv, resp);
 		clear_bit(m, drv->tcs_in_use);
 		send_tcs_response(resp);
 	}
@@ -259,6 +263,7 @@ static void tcs_notify_tx_done(unsigned long data)
 		}
 		list_del(&resp->list);
 		spin_unlock_irqrestore(&drv->drv_lock, flags);
+		trace_rpmh_notify_tx_done(drv, resp);
 		free_response(resp);
 	}
 }
@@ -287,6 +292,7 @@ static void __tcs_buffer_write(struct rsc_drv *drv, int m, int n,
 		write_tcs_reg(drv, RSC_DRV_CMD_MSGID, m, j, msgid);
 		write_tcs_reg(drv, RSC_DRV_CMD_ADDR, m, j, cmd->addr);
 		write_tcs_reg(drv, RSC_DRV_CMD_DATA, m, j, cmd->data);
+		trace_rpmh_send_msg(drv, m, j, msgid, cmd);
 	}
 
 	write_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, m, 0, cmd_complete);
diff --git a/drivers/soc/qcom/trace-rpmh.h b/drivers/soc/qcom/trace-rpmh.h
new file mode 100644
index 000000000000..8d7326e684db
--- /dev/null
+++ b/drivers/soc/qcom/trace-rpmh.h
@@ -0,0 +1,89 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ */
+
+#if !defined(_TRACE_RPMH_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_RPMH_H
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM rpmh
+
+#include <linux/tracepoint.h>
+#include "rpmh-internal.h"
+
+DECLARE_EVENT_CLASS(rpmh_notify,
+
+	TP_PROTO(struct rsc_drv *d, struct tcs_response *r),
+
+	TP_ARGS(d, r),
+
+	TP_STRUCT__entry(
+			 __string(name, d->name)
+			 __field(int, m)
+			 __field(u32, addr)
+			 __field(int, errno)
+	),
+
+	TP_fast_assign(
+		       __assign_str(name, d->name);
+		       __entry->m = r->m;
+		       __entry->addr = r->msg->cmds[0].addr;
+		       __entry->errno = r->err;
+	),
+
+	TP_printk("%s: ack: tcs-m:%d addr: %#x errno: %d",
+		  __get_str(name), __entry->m, __entry->addr, __entry->errno)
+);
+
+DEFINE_EVENT(rpmh_notify, rpmh_notify_irq,
+	     TP_PROTO(struct rsc_drv *d, struct tcs_response *r),
+	     TP_ARGS(d, r)
+);
+
+DEFINE_EVENT(rpmh_notify, rpmh_notify_tx_done,
+	     TP_PROTO(struct rsc_drv *d, struct tcs_response *r),
+	     TP_ARGS(d, r)
+);
+
+
+TRACE_EVENT(rpmh_send_msg,
+
+	TP_PROTO(struct rsc_drv *d, int m, int n, u32 h, struct tcs_cmd *c),
+
+	TP_ARGS(d, m, n, h, c),
+
+	TP_STRUCT__entry(
+			 __string(name, d->name)
+			 __field(int, m)
+			 __field(int, n)
+			 __field(u32, hdr)
+			 __field(u32, addr)
+			 __field(u32, data)
+			 __field(bool, wait)
+	),
+
+	TP_fast_assign(
+		       __assign_str(name, d->name);
+		       __entry->m = m;
+		       __entry->n = n;
+		       __entry->hdr = h;
+		       __entry->addr = c->addr;
+		       __entry->data = c->data;
+		       __entry->wait = c->wait;
+	),
+
+	TP_printk("%s: send-msg: tcs(m): %d cmd(n): %d msgid: %#x addr: %#x data: %#x complete: %d",
+		  __get_str(name), __entry->m, __entry->n, __entry->hdr,
+		  __entry->addr, __entry->data, __entry->wait)
+);
+
+#endif /* _TRACE_RPMH_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace-rpmh
+
+#include <trace/define_trace.h>
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* [PATCH v4 04/10] drivers: qcom: rpmh: add RPMH helper functions
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
                   ` (2 preceding siblings ...)
  2018-03-09 23:25 ` [PATCH v4 03/10] drivers: qcom: rpmh-rsc: log RPMH requests in FTRACE Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  2018-03-09 23:25 ` [PATCH v4 05/10] drivers: qcom: rpmh-rsc: write sleep/wake requests to TCS Lina Iyer
                   ` (5 subsequent siblings)
  9 siblings, 0 replies; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd, Lina Iyer

Sending RPMH requests and waiting for response from the controller
through a callback is common functionality across all platform drivers.
To simplify drivers, add a library functions to create RPMH client and
send resource state requests.

rpmh_write() is a synchronous blocking call that can be used to send
active state requests.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---

Changes in v4:
	- use const struct tcs_cmd in API
	- remove wait count from this patch
	- changed -EFAULT to -EINVAL
---
 drivers/soc/qcom/Makefile        |   4 +-
 drivers/soc/qcom/rpmh-internal.h |   2 +
 drivers/soc/qcom/rpmh-rsc.c      |   7 ++
 drivers/soc/qcom/rpmh.c          | 253 +++++++++++++++++++++++++++++++++++++++
 include/soc/qcom/rpmh.h          |  34 ++++++
 5 files changed, 299 insertions(+), 1 deletion(-)
 create mode 100644 drivers/soc/qcom/rpmh.c
 create mode 100644 include/soc/qcom/rpmh.h

diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index cb6300f6a8e9..bb395c3202ca 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -7,7 +7,9 @@ obj-$(CONFIG_QCOM_PM)	+=	spm.o
 obj-$(CONFIG_QCOM_QMI_HELPERS)	+= qmi_helpers.o
 qmi_helpers-y	+= qmi_encdec.o qmi_interface.o
 obj-$(CONFIG_QCOM_RMTFS_MEM)	+= rmtfs_mem.o
-obj-$(CONFIG_QCOM_RPMH)	+=	rpmh-rsc.o
+obj-$(CONFIG_QCOM_RPMH)		+= qcom_rpmh.o
+qcom_rpmh-y			+= rpmh-rsc.o
+qcom_rpmh-y			+= rpmh.o
 obj-$(CONFIG_QCOM_SMD_RPM)	+= smd-rpm.o
 obj-$(CONFIG_QCOM_SMEM) +=	smem.o
 obj-$(CONFIG_QCOM_SMEM_STATE) += smem_state.o
diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h
index aa73ec4b3e42..125f9faec536 100644
--- a/drivers/soc/qcom/rpmh-internal.h
+++ b/drivers/soc/qcom/rpmh-internal.h
@@ -86,4 +86,6 @@ struct rsc_drv {
 
 int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg);
 
+void rpmh_tx_done(const struct tcs_request *msg, int r);
+
 #endif /* __RPM_INTERNAL_H__ */
diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index f604101a4fc2..c5cde917dba6 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -252,6 +252,8 @@ static void tcs_notify_tx_done(unsigned long data)
 	struct rsc_drv *drv = (struct rsc_drv *)data;
 	struct tcs_response *resp;
 	unsigned long flags;
+	const struct tcs_request *msg;
+	int err;
 
 	for (;;) {
 		spin_lock_irqsave(&drv->drv_lock, flags);
@@ -264,7 +266,10 @@ static void tcs_notify_tx_done(unsigned long data)
 		list_del(&resp->list);
 		spin_unlock_irqrestore(&drv->drv_lock, flags);
 		trace_rpmh_notify_tx_done(drv, resp);
+		msg = resp->msg;
+		err = resp->err;
 		free_response(resp);
+		rpmh_tx_done(msg, err);
 	}
 }
 
@@ -554,6 +559,8 @@ static int rpmh_rsc_probe(struct platform_device *pdev)
 	/* Enable the active TCS to send requests immediately */
 	write_tcs_reg(drv, RSC_DRV_IRQ_ENABLE, 0, 0, drv->tcs[ACTIVE_TCS].mask);
 
+	dev_set_drvdata(&pdev->dev, drv);
+
 	return devm_of_platform_populate(&pdev->dev);
 }
 
diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
new file mode 100644
index 000000000000..e3c7491e7baf
--- /dev/null
+++ b/drivers/soc/qcom/rpmh.c
@@ -0,0 +1,253 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/atomic.h>
+#include <linux/interrupt.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/wait.h>
+
+#include <soc/qcom/rpmh.h>
+
+#include "rpmh-internal.h"
+
+#define RPMH_MAX_MBOXES			2
+#define RPMH_TIMEOUT_MS			10000
+
+#define DEFINE_RPMH_MSG_ONSTACK(rc, s, q, name)		\
+	struct rpmh_request name = {			\
+		.msg = {				\
+			.state = s,			\
+			.cmds = name.cmd,		\
+			.num_cmds = 0,			\
+			.wait_for_compl = true,		\
+		},					\
+		.cmd = { { 0 } },			\
+		.completion = q,			\
+		.rc = rc,				\
+	}
+
+/**
+ * struct rpmh_request: the message to be sent to rpmh-rsc
+ *
+ * @msg: the request
+ * @cmd: the payload that will be part of the @msg
+ * @completion: triggered when request is done
+ * @err: err return from the controller
+ */
+struct rpmh_request {
+	struct tcs_request msg;
+	struct tcs_cmd cmd[MAX_RPMH_PAYLOAD];
+	struct completion *completion;
+	struct rpmh_client *rc;
+	int err;
+};
+
+/**
+ * struct rpmh_ctrlr: our representation of the controller
+ *
+ * @drv: the controller instance
+ */
+struct rpmh_ctrlr {
+	struct rsc_drv *drv;
+};
+
+/**
+ * struct rpmh_client: the client object
+ *
+ * @dev: the platform device that is the owner
+ * @ctrlr: the controller associated with this client.
+ */
+struct rpmh_client {
+	struct device *dev;
+	struct rpmh_ctrlr *ctrlr;
+};
+
+static struct rpmh_ctrlr rpmh_rsc[RPMH_MAX_MBOXES];
+static DEFINE_MUTEX(rpmh_ctrlr_mutex);
+
+void rpmh_tx_done(const struct tcs_request *msg, int r)
+{
+	struct rpmh_request *rpm_msg = container_of(msg, struct rpmh_request,
+						    msg);
+	struct completion *compl = rpm_msg->completion;
+
+	rpm_msg->err = r;
+
+	if (r)
+		dev_err(rpm_msg->rc->dev,
+			"RPMH TX fail in msg addr=%#x, err=%d\n",
+			rpm_msg->msg.cmds[0].addr, r);
+
+	/* Signal the blocking thread we are done */
+	if (compl)
+		complete(compl);
+}
+EXPORT_SYMBOL(rpmh_tx_done);
+
+/**
+ * wait_for_tx_done: Wait until the response is received.
+ *
+ * @rc: The RPMH client
+ * @compl: The completion object
+ * @addr: An addr that we sent in that request
+ * @data: The data for the address in that request
+ */
+static int wait_for_tx_done(struct rpmh_client *rc,
+			    struct completion *compl, u32 addr, u32 data)
+{
+	int ret;
+
+	might_sleep();
+
+	ret = wait_for_completion_timeout(compl,
+					  msecs_to_jiffies(RPMH_TIMEOUT_MS));
+	if (ret)
+		dev_dbg(rc->dev,
+			"RPMH response received addr=%#x data=%#x\n",
+			addr, data);
+	else
+		dev_err(rc->dev,
+			"RPMH response timeout addr=%#x data=%#x\n",
+			addr, data);
+
+	return (ret > 0) ? 0 : -ETIMEDOUT;
+}
+
+/**
+ * __rpmh_write: send the RPMH request
+ *
+ * @rc: The RPMH client
+ * @state: Active/Sleep request type
+ * @rpm_msg: The data that needs to be sent (cmds).
+ */
+static int __rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
+			struct rpmh_request *rpm_msg)
+{
+	int ret = -EINVAL;
+
+	rpm_msg->msg.state = state;
+
+	if (state == RPMH_ACTIVE_ONLY_STATE) {
+		WARN_ON(irqs_disabled());
+		ret = rpmh_rsc_send_data(rc->ctrlr->drv, &rpm_msg->msg);
+		if (!ret)
+			dev_dbg(rc->dev,
+				"RPMH request sent addr=%#x, data=%i#x\n",
+				rpm_msg->msg.cmds[0].addr,
+				rpm_msg->msg.cmds[0].data);
+		else
+			dev_warn(rc->dev,
+				 "Error in RPMH request addr=%#x, data=%#x\n",
+				 rpm_msg->msg.cmds[0].addr,
+				 rpm_msg->msg.cmds[0].data);
+	}
+
+	return ret;
+}
+
+/**
+ * rpmh_write: Write a set of RPMH commands and block until response
+ *
+ * @rc: The RPMh handle got from rpmh_get_client
+ * @state: Active/sleep set
+ * @cmd: The payload data
+ * @n: The number of elements in @cmd
+ *
+ * May sleep. Do not call from atomic contexts.
+ */
+int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
+	       const struct tcs_cmd *cmd, u32 n)
+{
+	DECLARE_COMPLETION_ONSTACK(compl);
+	DEFINE_RPMH_MSG_ONSTACK(rc, state, &compl, rpm_msg);
+	int ret;
+
+	if (IS_ERR_OR_NULL(rc) || !cmd || !n || n > MAX_RPMH_PAYLOAD)
+		return -EINVAL;
+
+	memcpy(rpm_msg.cmd, cmd, n * sizeof(*cmd));
+	rpm_msg.msg.num_cmds = n;
+
+	ret = __rpmh_write(rc, state, &rpm_msg);
+	if (ret)
+		return ret;
+
+	return wait_for_tx_done(rc, &compl, cmd[0].addr, cmd[0].data);
+}
+EXPORT_SYMBOL(rpmh_write);
+
+static struct rpmh_ctrlr *get_rpmh_ctrlr(struct platform_device *pdev)
+{
+	int i;
+	struct rsc_drv *drv = dev_get_drvdata(pdev->dev.parent);
+	struct rpmh_ctrlr *ctrlr = ERR_PTR(-EINVAL);
+
+	if (!drv)
+		return ctrlr;
+
+	mutex_lock(&rpmh_ctrlr_mutex);
+	for (i = 0; i < RPMH_MAX_MBOXES; i++) {
+		if (rpmh_rsc[i].drv == drv) {
+			ctrlr = &rpmh_rsc[i];
+			goto unlock;
+		}
+	}
+
+	for (i = 0; i < RPMH_MAX_MBOXES; i++) {
+		if (rpmh_rsc[i].drv == NULL) {
+			ctrlr = &rpmh_rsc[i];
+			ctrlr->drv = drv;
+			break;
+		}
+	}
+	WARN_ON(i == RPMH_MAX_MBOXES);
+unlock:
+	mutex_unlock(&rpmh_ctrlr_mutex);
+	return ctrlr;
+}
+
+/**
+ * rpmh_get_client: Get the RPMh handle
+ *
+ * @pdev: the platform device which needs to communicate with RPM
+ * accelerators
+ * May sleep.
+ */
+struct rpmh_client *rpmh_get_client(struct platform_device *pdev)
+{
+	struct rpmh_client *rc;
+
+	rc = kzalloc(sizeof(*rc), GFP_KERNEL);
+	if (!rc)
+		return ERR_PTR(-ENOMEM);
+
+	rc->dev = &pdev->dev;
+	rc->ctrlr = get_rpmh_ctrlr(pdev);
+	if (IS_ERR(rc->ctrlr)) {
+		kfree(rc);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return rc;
+}
+EXPORT_SYMBOL(rpmh_get_client);
+
+/**
+ * rpmh_release: Release the RPMH client
+ *
+ * @rc: The RPMh handle to be freed.
+ */
+void rpmh_release(struct rpmh_client *rc)
+{
+	kfree(rc);
+}
+EXPORT_SYMBOL(rpmh_release);
diff --git a/include/soc/qcom/rpmh.h b/include/soc/qcom/rpmh.h
new file mode 100644
index 000000000000..95334d4c1ede
--- /dev/null
+++ b/include/soc/qcom/rpmh.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ */
+
+#ifndef __SOC_QCOM_RPMH_H__
+#define __SOC_QCOM_RPMH_H__
+
+#include <soc/qcom/tcs.h>
+#include <linux/platform_device.h>
+
+struct rpmh_client;
+
+#if IS_ENABLED(CONFIG_QCOM_RPMH)
+int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
+	       const struct tcs_cmd *cmd, u32 n);
+
+struct rpmh_client *rpmh_get_client(struct platform_device *pdev);
+
+void rpmh_release(struct rpmh_client *rc);
+
+#else
+
+static inline int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
+			     const struct tcs_cmd *cmd, u32 n)
+{ return -ENODEV; }
+
+static inline struct rpmh_client *rpmh_get_client(struct platform_device *pdev)
+{ return ERR_PTR(-ENODEV); }
+
+static inline void rpmh_release(struct rpmh_client *rc) { }
+#endif /* CONFIG_QCOM_RPMH */
+
+#endif /* __SOC_QCOM_RPMH_H__ */
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* [PATCH v4 05/10] drivers: qcom: rpmh-rsc: write sleep/wake requests to TCS
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
                   ` (3 preceding siblings ...)
  2018-03-09 23:25 ` [PATCH v4 04/10] drivers: qcom: rpmh: add RPMH helper functions Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  2018-03-17  0:35   ` Evan Green
  2018-03-09 23:25 ` [PATCH v4 06/10] drivers: qcom: rpmh-rsc: allow invalidation of sleep/wake TCS Lina Iyer
                   ` (4 subsequent siblings)
  9 siblings, 1 reply; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd, Lina Iyer

Sleep and wake requests are sent when the application processor
subsystem of the SoC is entering deep sleep states like in suspend.
These requests help lower the system power requirements when the
resources are not in use.

Sleep and wake requests are written to the TCS slots but are not
triggered at the time of writing. The TCS are triggered by the firmware
after the last of the CPUs has executed its WFI. Since these requests
may come in different batches of requests, it is the job of this
controller driver to find and arrange the requests into the available
TCSes.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---
 drivers/soc/qcom/rpmh-internal.h |   9 ++-
 drivers/soc/qcom/rpmh-rsc.c      | 120 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 128 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h
index 125f9faec536..638662721086 100644
--- a/drivers/soc/qcom/rpmh-internal.h
+++ b/drivers/soc/qcom/rpmh-internal.h
@@ -14,6 +14,7 @@
 #define MAX_CMDS_PER_TCS		16
 #define MAX_TCS_PER_TYPE		3
 #define MAX_TCS_NR			(MAX_TCS_PER_TYPE * TCS_TYPE_NR)
+#define MAX_TCS_SLOTS			(MAX_CMDS_PER_TCS * MAX_TCS_PER_TYPE)
 
 struct rsc_drv;
 
@@ -45,6 +46,8 @@ struct tcs_response {
  * @ncpt:      number of commands in each TCS
  * @lock:      lock for synchronizing this TCS writes
  * @responses: response objects for requests sent from each TCS
+ * @cmd_cache: flattened cache of cmds in sleep/wake TCS
+ * @slots:     indicates which of @cmd_addr are occupied
  */
 struct tcs_group {
 	struct rsc_drv *drv;
@@ -55,6 +58,8 @@ struct tcs_group {
 	int ncpt;
 	spinlock_t lock;
 	struct tcs_response *responses[MAX_TCS_PER_TYPE];
+	u32 *cmd_cache;
+	DECLARE_BITMAP(slots, MAX_TCS_SLOTS);
 };
 
 /**
@@ -69,7 +74,7 @@ struct tcs_group {
  *              list of responses that needs to be sent to caller
  * @tcs:        TCS groups
  * @tcs_in_use: s/w state of the TCS
- * @drv_lock:  synchronize state of the controller
+ * @drv_lock:   synchronize state of the controller
  */
 struct rsc_drv {
 	const char *name;
@@ -85,6 +90,8 @@ struct rsc_drv {
 
 
 int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg);
+int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv,
+			     const struct tcs_request *msg);
 
 void rpmh_tx_done(const struct tcs_request *msg, int r);
 
diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index c5cde917dba6..58fc7254b6f3 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -171,6 +171,12 @@ static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv,
 	case RPMH_ACTIVE_ONLY_STATE:
 		type = ACTIVE_TCS;
 		break;
+	case RPMH_WAKE_ONLY_STATE:
+		type = WAKE_TCS;
+		break;
+	case RPMH_SLEEP_STATE:
+		type = SLEEP_TCS;
+		break;
 	default:
 		return ERR_PTR(-EINVAL);
 	}
@@ -439,6 +445,107 @@ int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg)
 }
 EXPORT_SYMBOL(rpmh_rsc_send_data);
 
+static int find_match(const struct tcs_group *tcs, const struct tcs_cmd *cmd,
+		      int len)
+{
+	int i, j;
+
+	/* Check for already cached commands */
+	for_each_set_bit(i, tcs->slots, MAX_TCS_SLOTS) {
+		for (j = 0; j < len; j++) {
+			if (tcs->cmd_cache[i] != cmd[0].addr) {
+				if (j == 0)
+					break;
+				WARN(tcs->cmd_cache[i + j] != cmd[j].addr,
+				     "Message does not match previous sequence.\n");
+				return -EINVAL;
+			} else if (j == len - 1) {
+				return i;
+			}
+		}
+	}
+
+	return -ENODATA;
+}
+
+static int find_slots(struct tcs_group *tcs, const struct tcs_request *msg,
+		      int *m, int *n)
+{
+	int slot, offset;
+	int i = 0;
+
+	/* Find if we already have the msg in our TCS */
+	slot = find_match(tcs, msg->cmds, msg->num_cmds);
+	if (slot >= 0)
+		goto copy_data;
+
+	/* Do over, until we can fit the full payload in a TCS */
+	do {
+		slot = bitmap_find_next_zero_area(tcs->slots, MAX_TCS_SLOTS,
+						  i, msg->num_cmds, 0);
+		if (slot == MAX_TCS_SLOTS)
+			return -ENOMEM;
+		i += tcs->ncpt;
+	} while (slot + msg->num_cmds - 1 >= i);
+
+copy_data:
+	bitmap_set(tcs->slots, slot, msg->num_cmds);
+	/* Copy the addresses of the resources over to the slots */
+	for (i = 0; i < msg->num_cmds; i++)
+		tcs->cmd_cache[slot + i] = msg->cmds[i].addr;
+
+	offset = slot / tcs->ncpt;
+	*m = offset + tcs->offset;
+	*n = slot % tcs->ncpt;
+
+	return 0;
+}
+
+static int tcs_ctrl_write(struct rsc_drv *drv, const struct tcs_request *msg)
+{
+	struct tcs_group *tcs;
+	int m = 0, n = 0;
+	unsigned long flags;
+	int ret;
+
+	tcs = get_tcs_for_msg(drv, msg);
+	if (IS_ERR(tcs))
+		return PTR_ERR(tcs);
+
+	spin_lock_irqsave(&tcs->lock, flags);
+	/* find the m-th TCS and the n-th position in the TCS to write to */
+	ret = find_slots(tcs, msg, &m, &n);
+	if (!ret)
+		__tcs_buffer_write(drv, m, n, msg);
+	spin_unlock_irqrestore(&tcs->lock, flags);
+
+	return ret;
+}
+
+/**
+ * rpmh_rsc_write_ctrl_data: Write request to the controller
+ *
+ * @drv: the controller
+ * @msg: the data to be written to the controller
+ *
+ * There is no response returned for writing the request to the controller.
+ */
+int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv, const struct tcs_request *msg)
+{
+	if (!msg || !msg->cmds || !msg->num_cmds ||
+	    msg->num_cmds > MAX_RPMH_PAYLOAD) {
+		pr_err("Payload error\n");
+		return -EINVAL;
+	}
+
+	/* Data sent to this API will not be sent immediately */
+	if (msg->state == RPMH_ACTIVE_ONLY_STATE)
+		return -EINVAL;
+
+	return tcs_ctrl_write(drv, msg);
+}
+EXPORT_SYMBOL(rpmh_rsc_write_ctrl_data);
+
 static int rpmh_probe_tcs_config(struct platform_device *pdev,
 				 struct rsc_drv *drv)
 {
@@ -512,6 +619,19 @@ static int rpmh_probe_tcs_config(struct platform_device *pdev,
 		tcs->mask = ((1 << tcs->num_tcs) - 1) << st;
 		tcs->offset = st;
 		st += tcs->num_tcs;
+
+		/*
+		 * Allocate memory to cache sleep and wake requests to
+		 * avoid reading TCS register memory.
+		 */
+		if (tcs->type == ACTIVE_TCS)
+			continue;
+
+		tcs->cmd_cache = devm_kcalloc(&pdev->dev,
+					      tcs->num_tcs * ncpt, sizeof(u32),
+					      GFP_KERNEL);
+		if (!tcs->cmd_cache)
+			return -ENOMEM;
 	}
 
 	drv->num_tcs = st;
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* [PATCH v4 06/10] drivers: qcom: rpmh-rsc: allow invalidation of sleep/wake TCS
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
                   ` (4 preceding siblings ...)
  2018-03-09 23:25 ` [PATCH v4 05/10] drivers: qcom: rpmh-rsc: write sleep/wake requests to TCS Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  2018-03-09 23:25 ` [PATCH v4 07/10] drivers: qcom: rpmh: cache sleep/wake state requests Lina Iyer
                   ` (3 subsequent siblings)
  9 siblings, 0 replies; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd, Lina Iyer

Allow sleep and wake commands to be cleared from the respective TCSes,
so that they can be re-populated.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---

Changes in v4:
	- refactored the rphm_rsc_invalidate()
---
 drivers/soc/qcom/rpmh-internal.h |  1 +
 drivers/soc/qcom/rpmh-rsc.c      | 48 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/drivers/soc/qcom/rpmh-internal.h b/drivers/soc/qcom/rpmh-internal.h
index 638662721086..3fab86a01f14 100644
--- a/drivers/soc/qcom/rpmh-internal.h
+++ b/drivers/soc/qcom/rpmh-internal.h
@@ -92,6 +92,7 @@ struct rsc_drv {
 int rpmh_rsc_send_data(struct rsc_drv *drv, const struct tcs_request *msg);
 int rpmh_rsc_write_ctrl_data(struct rsc_drv *drv,
 			     const struct tcs_request *msg);
+int rpmh_rsc_invalidate(struct rsc_drv *drv);
 
 void rpmh_tx_done(const struct tcs_request *msg, int r);
 
diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index 58fc7254b6f3..1dbccc4d0605 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -162,6 +162,54 @@ static struct tcs_group *get_tcs_of_type(struct rsc_drv *drv, int type)
 	return tcs;
 }
 
+static int __tcs_invalidate(struct rsc_drv *drv, int type)
+{
+	int m;
+	struct tcs_group *tcs;
+
+	tcs = get_tcs_of_type(drv, type);
+	if (IS_ERR(tcs))
+		return PTR_ERR(tcs);
+
+	spin_lock(&tcs->lock);
+	if (bitmap_empty(tcs->slots, MAX_TCS_SLOTS)) {
+		spin_unlock(&tcs->lock);
+		return 0;
+	}
+
+	for (m = tcs->offset; m < tcs->offset + tcs->num_tcs; m++) {
+		if (!tcs_is_free(drv, m)) {
+			spin_unlock(&tcs->lock);
+			return -EAGAIN;
+		}
+		write_tcs_reg_sync(drv, RSC_DRV_CMD_ENABLE, m, 0, 0);
+		bitmap_zero(tcs->slots, MAX_TCS_SLOTS);
+	}
+	spin_unlock(&tcs->lock);
+
+	return 0;
+}
+
+/**
+ * rpmh_rsc_invalidate - Invalidate sleep and wake TCSes
+ *
+ * @drv: the mailbox controller
+ */
+int rpmh_rsc_invalidate(struct rsc_drv *drv)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&drv->drv_lock, flags);
+	ret = __tcs_invalidate(drv, SLEEP_TCS);
+	if (!ret)
+		ret = __tcs_invalidate(drv, WAKE_TCS);
+	spin_unlock_irqrestore(&drv->drv_lock, flags);
+
+	return ret;
+}
+EXPORT_SYMBOL(rpmh_rsc_invalidate);
+
 static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv,
 					 const struct tcs_request *msg)
 {
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* [PATCH v4 07/10] drivers: qcom: rpmh: cache sleep/wake state requests
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
                   ` (5 preceding siblings ...)
  2018-03-09 23:25 ` [PATCH v4 06/10] drivers: qcom: rpmh-rsc: allow invalidation of sleep/wake TCS Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  2018-03-17  0:36   ` Evan Green
  2018-03-09 23:25 ` [PATCH v4 08/10] drivers: qcom: rpmh: allow requests to be sent asynchronously Lina Iyer
                   ` (2 subsequent siblings)
  9 siblings, 1 reply; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd, Lina Iyer

Active state requests are sent immediately to the mailbox controller,
while sleep and wake state requests are cached in this driver to avoid
taxing the mailbox controller repeatedly. The cached values will be sent
to the controller when the rpmh_flush() is called.

Generally, flushing is a system PM activity and may be called from the
system PM drivers when the system is entering suspend or deeper sleep
modes during cpuidle.

Also allow invalidating the cached requests, so they may be re-populated
again.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---

Changes in v4:
	- remove locking for ->dirty in invalidate
	- fix send_single
Changes in v3:
	- Remove locking for flush function
	- Improve comments
---
 drivers/soc/qcom/rpmh.c | 203 +++++++++++++++++++++++++++++++++++++++++++++++-
 include/soc/qcom/rpmh.h |  10 +++
 2 files changed, 212 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
index e3c7491e7baf..b5468ef082c1 100644
--- a/drivers/soc/qcom/rpmh.c
+++ b/drivers/soc/qcom/rpmh.c
@@ -7,11 +7,13 @@
 #include <linux/interrupt.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
+#include <linux/list.h>
 #include <linux/mailbox_client.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
+#include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/wait.h>
 
@@ -35,6 +37,21 @@
 		.rc = rc,				\
 	}
 
+/**
+ * struct cache_req: the request object for caching
+ *
+ * @addr: the address of the resource
+ * @sleep_val: the sleep vote
+ * @wake_val: the wake vote
+ * @list: linked list obj
+ */
+struct cache_req {
+	u32 addr;
+	u32 sleep_val;
+	u32 wake_val;
+	struct list_head list;
+};
+
 /**
  * struct rpmh_request: the message to be sent to rpmh-rsc
  *
@@ -55,9 +72,15 @@ struct rpmh_request {
  * struct rpmh_ctrlr: our representation of the controller
  *
  * @drv: the controller instance
+ * @cache: the list of cached requests
+ * @lock: synchronize access to the controller data
+ * @dirty: was the cache updated since flush
  */
 struct rpmh_ctrlr {
 	struct rsc_drv *drv;
+	struct list_head cache;
+	spinlock_t lock;
+	bool dirty;
 };
 
 /**
@@ -122,17 +145,91 @@ static int wait_for_tx_done(struct rpmh_client *rc,
 	return (ret > 0) ? 0 : -ETIMEDOUT;
 }
 
+static struct cache_req *__find_req(struct rpmh_client *rc, u32 addr)
+{
+	struct cache_req *p, *req = NULL;
+
+	list_for_each_entry(p, &rc->ctrlr->cache, list) {
+		if (p->addr == addr) {
+			req = p;
+			break;
+		}
+	}
+
+	return req;
+}
+
+static struct cache_req *cache_rpm_request(struct rpmh_client *rc,
+					   enum rpmh_state state,
+					   struct tcs_cmd *cmd)
+{
+	struct cache_req *req;
+	struct rpmh_ctrlr *rpm = rc->ctrlr;
+	unsigned long flags;
+
+	spin_lock_irqsave(&rpm->lock, flags);
+	req = __find_req(rc, cmd->addr);
+	if (req)
+		goto existing;
+
+	req = kzalloc(sizeof(*req), GFP_ATOMIC);
+	if (!req) {
+		req = ERR_PTR(-ENOMEM);
+		goto unlock;
+	}
+
+	req->addr = cmd->addr;
+	req->sleep_val = req->wake_val = UINT_MAX;
+	INIT_LIST_HEAD(&req->list);
+	list_add_tail(&req->list, &rpm->cache);
+
+existing:
+	switch (state) {
+	case RPMH_ACTIVE_ONLY_STATE:
+		if (req->sleep_val != UINT_MAX)
+			req->wake_val = cmd->data;
+		break;
+	case RPMH_WAKE_ONLY_STATE:
+		req->wake_val = cmd->data;
+		break;
+	case RPMH_SLEEP_STATE:
+		req->sleep_val = cmd->data;
+		break;
+	default:
+		break;
+	};
+
+	rpm->dirty = true;
+unlock:
+	spin_unlock_irqrestore(&rpm->lock, flags);
+
+	return req;
+}
+
 /**
- * __rpmh_write: send the RPMH request
+ * __rpmh_write: Cache and send the RPMH request
  *
  * @rc: The RPMH client
  * @state: Active/Sleep request type
  * @rpm_msg: The data that needs to be sent (cmds).
+ *
+ * Cache the RPMH request and send if the state is ACTIVE_ONLY.
+ * SLEEP/WAKE_ONLY requests are not sent to the controller at
+ * this time. Use rpmh_flush() to send them to the controller.
  */
 static int __rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 			struct rpmh_request *rpm_msg)
 {
 	int ret = -EINVAL;
+	struct cache_req *req;
+	int i;
+
+	/* Cache the request in our store and link the payload */
+	for (i = 0; i < rpm_msg->msg.num_cmds; i++) {
+		req = cache_rpm_request(rc, state, &rpm_msg->msg.cmds[i]);
+		if (IS_ERR(req))
+			return PTR_ERR(req);
+	}
 
 	rpm_msg->msg.state = state;
 
@@ -149,6 +246,10 @@ static int __rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 				 "Error in RPMH request addr=%#x, data=%#x\n",
 				 rpm_msg->msg.cmds[0].addr,
 				 rpm_msg->msg.cmds[0].data);
+	} else {
+		ret = rpmh_rsc_write_ctrl_data(rc->ctrlr->drv, &rpm_msg->msg);
+		/* Clean up our call by spoofing tx_done */
+		rpmh_tx_done(&rpm_msg->msg, ret);
 	}
 
 	return ret;
@@ -185,6 +286,104 @@ int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 }
 EXPORT_SYMBOL(rpmh_write);
 
+static int is_req_valid(struct cache_req *req)
+{
+	return (req->sleep_val != UINT_MAX &&
+		req->wake_val != UINT_MAX &&
+		req->sleep_val != req->wake_val);
+}
+
+static int send_single(struct rpmh_client *rc, enum rpmh_state state,
+		      u32 addr, u32 data)
+{
+	DEFINE_RPMH_MSG_ONSTACK(rc, state, NULL, rpm_msg);
+
+	/* Wake sets are always complete and sleep sets are not */
+	rpm_msg.msg.wait_for_compl = (state == RPMH_WAKE_ONLY_STATE);
+	rpm_msg.cmd[0].addr = addr;
+	rpm_msg.cmd[0].data = data;
+	rpm_msg.msg.num_cmds = 1;
+
+	return rpmh_rsc_write_ctrl_data(rc->ctrlr->drv, &rpm_msg.msg);
+}
+
+/**
+ * rpmh_flush: Flushes the buffered active and sleep sets to TCS
+ *
+ * @rc: The RPMh handle got from rpmh_get_client
+ *
+ * Return: -EBUSY if the controller is busy, probably waiting on a response
+ * to a RPMH request sent earlier.
+ *
+ * This function is generally called from the sleep code from the last CPU
+ * that is powering down the entire system. Since no other RPMH API would be
+ * executing at this time, it is safe to run lockless.
+ */
+int rpmh_flush(struct rpmh_client *rc)
+{
+	struct cache_req *p;
+	struct rpmh_ctrlr *rpm = rc->ctrlr;
+	int ret;
+
+	if (IS_ERR_OR_NULL(rc))
+		return -EINVAL;
+
+	if (!rpm->dirty) {
+		pr_debug("Skipping flush, TCS has latest data.\n");
+		return 0;
+	}
+
+	/*
+	 * Nobody else should be calling this function other than system PM,,
+	 * hence we can run without locks.
+	 */
+	list_for_each_entry(p, &rc->ctrlr->cache, list) {
+		if (!is_req_valid(p)) {
+			pr_debug("%s: skipping RPMH req: a:%#x s:%#x w:%#x",
+				 __func__, p->addr, p->sleep_val, p->wake_val);
+			continue;
+		}
+		ret = send_single(rc, RPMH_SLEEP_STATE, p->addr, p->sleep_val);
+		if (ret)
+			return ret;
+		ret = send_single(rc, RPMH_WAKE_ONLY_STATE,
+				  p->addr, p->wake_val);
+		if (ret)
+			return ret;
+	}
+
+	rpm->dirty = false;
+
+	return 0;
+}
+EXPORT_SYMBOL(rpmh_flush);
+
+/**
+ * rpmh_invalidate: Invalidate all sleep and active sets
+ * sets.
+ *
+ * @rc: The RPMh handle got from rpmh_get_client
+ *
+ * Invalidate the sleep and active values in the TCS blocks.
+ */
+int rpmh_invalidate(struct rpmh_client *rc)
+{
+	struct rpmh_ctrlr *rpm = rc->ctrlr;
+	int ret;
+
+	if (IS_ERR_OR_NULL(rc))
+		return -EINVAL;
+
+	rpm->dirty = true;
+
+	do {
+		ret = rpmh_rsc_invalidate(rc->ctrlr->drv);
+	} while (ret == -EAGAIN);
+
+	return ret;
+}
+EXPORT_SYMBOL(rpmh_invalidate);
+
 static struct rpmh_ctrlr *get_rpmh_ctrlr(struct platform_device *pdev)
 {
 	int i;
@@ -206,6 +405,8 @@ static struct rpmh_ctrlr *get_rpmh_ctrlr(struct platform_device *pdev)
 		if (rpmh_rsc[i].drv == NULL) {
 			ctrlr = &rpmh_rsc[i];
 			ctrlr->drv = drv;
+			spin_lock_init(&ctrlr->lock);
+			INIT_LIST_HEAD(&ctrlr->cache);
 			break;
 		}
 	}
diff --git a/include/soc/qcom/rpmh.h b/include/soc/qcom/rpmh.h
index 95334d4c1ede..41a2518c46a5 100644
--- a/include/soc/qcom/rpmh.h
+++ b/include/soc/qcom/rpmh.h
@@ -17,6 +17,10 @@ int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 
 struct rpmh_client *rpmh_get_client(struct platform_device *pdev);
 
+int rpmh_flush(struct rpmh_client *rc);
+
+int rpmh_invalidate(struct rpmh_client *rc);
+
 void rpmh_release(struct rpmh_client *rc);
 
 #else
@@ -28,6 +32,12 @@ static inline int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 static inline struct rpmh_client *rpmh_get_client(struct platform_device *pdev)
 { return ERR_PTR(-ENODEV); }
 
+static inline int rpmh_flush(struct rpmh_client *rc)
+{ return -ENODEV; }
+
+static inline int rpmh_invalidate(struct rpmh_client *rc)
+{ return -ENODEV; }
+
 static inline void rpmh_release(struct rpmh_client *rc) { }
 #endif /* CONFIG_QCOM_RPMH */
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* [PATCH v4 08/10] drivers: qcom: rpmh: allow requests to be sent asynchronously
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
                   ` (6 preceding siblings ...)
  2018-03-09 23:25 ` [PATCH v4 07/10] drivers: qcom: rpmh: cache sleep/wake state requests Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  2018-03-09 23:25 ` [PATCH v4 09/10] drivers: qcom: rpmh: add support for batch RPMH request Lina Iyer
  2018-03-09 23:25 ` [PATCH v4 10/10] drivers: qcom: rpmh-rsc: allow active requests from wake TCS Lina Iyer
  9 siblings, 0 replies; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd, Lina Iyer

Platform drivers that want to send a request but do not want to block
until the RPMH request completes have now a new API -
rpmh_write_async().

The API allocates memory and send the requests and returns the control
back to the platform driver. The tx_done callback from the controller is
handled in the context of the controller's thread and frees the
allocated memory. This API allows RPMH requests from atomic contexts as
well.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---
 drivers/soc/qcom/rpmh.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++
 include/soc/qcom/rpmh.h |  8 ++++++++
 2 files changed, 61 insertions(+)

diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
index b5468ef082c1..3a96e5f58302 100644
--- a/drivers/soc/qcom/rpmh.c
+++ b/drivers/soc/qcom/rpmh.c
@@ -35,6 +35,7 @@
 		.cmd = { { 0 } },			\
 		.completion = q,			\
 		.rc = rc,				\
+		.free = NULL,				\
 	}
 
 /**
@@ -59,6 +60,7 @@ struct cache_req {
  * @cmd: the payload that will be part of the @msg
  * @completion: triggered when request is done
  * @err: err return from the controller
+ * @free: the request object to be freed at tx_done
  */
 struct rpmh_request {
 	struct tcs_request msg;
@@ -66,6 +68,7 @@ struct rpmh_request {
 	struct completion *completion;
 	struct rpmh_client *rc;
 	int err;
+	struct rpmh_request *free;
 };
 
 /**
@@ -110,6 +113,8 @@ void rpmh_tx_done(const struct tcs_request *msg, int r)
 			"RPMH TX fail in msg addr=%#x, err=%d\n",
 			rpm_msg->msg.cmds[0].addr, r);
 
+	kfree(rpm_msg->free);
+
 	/* Signal the blocking thread we are done */
 	if (compl)
 		complete(compl);
@@ -255,6 +260,54 @@ static int __rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 	return ret;
 }
 
+static struct rpmh_request *__get_rpmh_msg_async(struct rpmh_client *rc,
+						 enum rpmh_state state,
+						 const struct tcs_cmd *cmd,
+						 u32 n)
+{
+	struct rpmh_request *req;
+
+	if (IS_ERR_OR_NULL(rc) || !cmd || !n || n > MAX_RPMH_PAYLOAD)
+		return ERR_PTR(-EINVAL);
+
+	req = kzalloc(sizeof(*req), GFP_ATOMIC);
+	if (!req)
+		return ERR_PTR(-ENOMEM);
+
+	memcpy(req->cmd, cmd, n * sizeof(*cmd));
+
+	req->msg.state = state;
+	req->msg.cmds = req->cmd;
+	req->msg.num_cmds = n;
+	req->free = req;
+
+	return req;
+}
+
+/**
+ * rpmh_write_async: Write a set of RPMH commands
+ *
+ * @rc: The RPMh handle got from rpmh_get_client
+ * @state: Active/sleep set
+ * @cmd: The payload data
+ * @n: The number of elements in payload
+ *
+ * Write a set of RPMH commands, the order of commands is maintained
+ * and will be sent as a single shot.
+ */
+int rpmh_write_async(struct rpmh_client *rc, enum rpmh_state state,
+		     const struct tcs_cmd *cmd, u32 n)
+{
+	struct rpmh_request *rpm_msg;
+
+	rpm_msg = __get_rpmh_msg_async(rc, state, cmd, n);
+	if (IS_ERR(rpm_msg))
+		return PTR_ERR(rpm_msg);
+
+	return __rpmh_write(rc, state, rpm_msg);
+}
+EXPORT_SYMBOL(rpmh_write_async);
+
 /**
  * rpmh_write: Write a set of RPMH commands and block until response
  *
diff --git a/include/soc/qcom/rpmh.h b/include/soc/qcom/rpmh.h
index 41a2518c46a5..9e6de09e43f0 100644
--- a/include/soc/qcom/rpmh.h
+++ b/include/soc/qcom/rpmh.h
@@ -15,6 +15,9 @@ struct rpmh_client;
 int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 	       const struct tcs_cmd *cmd, u32 n);
 
+int rpmh_write_async(struct rpmh_client *rc, enum rpmh_state state,
+		     const struct tcs_cmd *cmd, u32 n);
+
 struct rpmh_client *rpmh_get_client(struct platform_device *pdev);
 
 int rpmh_flush(struct rpmh_client *rc);
@@ -32,6 +35,11 @@ static inline int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 static inline struct rpmh_client *rpmh_get_client(struct platform_device *pdev)
 { return ERR_PTR(-ENODEV); }
 
+static inline int rpmh_write_async(struct rpmh_client *rc,
+				   enum rpmh_state state,
+				   const struct tcs_cmd *cmd, u32 n)
+{ return -ENODEV; }
+
 static inline int rpmh_flush(struct rpmh_client *rc)
 { return -ENODEV; }
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* [PATCH v4 09/10] drivers: qcom: rpmh: add support for batch RPMH request
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
                   ` (7 preceding siblings ...)
  2018-03-09 23:25 ` [PATCH v4 08/10] drivers: qcom: rpmh: allow requests to be sent asynchronously Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  2018-03-17  0:36   ` Evan Green
  2018-03-09 23:25 ` [PATCH v4 10/10] drivers: qcom: rpmh-rsc: allow active requests from wake TCS Lina Iyer
  9 siblings, 1 reply; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd, Lina Iyer

Platform drivers need make a lot of resource state requests at the same
time, say, at the start or end of an usecase. It can be quite
inefficient to send each request separately. Instead they can give the
RPMH library a batch of requests to be sent and wait on the whole
transaction to be complete.

rpmh_write_batch() is a blocking call that can be used to send multiple
RPMH command sets. Each RPMH command set is set asynchronously and the
API blocks until all the command sets are complete and receive their
tx_done callbacks.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---

Changes in v4:
	- reorganize rpmh_write_batch()
	- introduce wait_count here, instead of patch#4
---
 drivers/soc/qcom/rpmh.c | 156 +++++++++++++++++++++++++++++++++++++++++++++++-
 include/soc/qcom/rpmh.h |   8 +++
 2 files changed, 162 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/qcom/rpmh.c b/drivers/soc/qcom/rpmh.c
index 3a96e5f58302..daadbb3f0494 100644
--- a/drivers/soc/qcom/rpmh.c
+++ b/drivers/soc/qcom/rpmh.c
@@ -23,6 +23,7 @@
 
 #define RPMH_MAX_MBOXES			2
 #define RPMH_TIMEOUT_MS			10000
+#define RPMH_MAX_REQ_IN_BATCH		10
 
 #define DEFINE_RPMH_MSG_ONSTACK(rc, s, q, name)		\
 	struct rpmh_request name = {			\
@@ -36,6 +37,7 @@
 		.completion = q,			\
 		.rc = rc,				\
 		.free = NULL,				\
+		.wait_count = NULL,			\
 	}
 
 /**
@@ -61,6 +63,7 @@ struct cache_req {
  * @completion: triggered when request is done
  * @err: err return from the controller
  * @free: the request object to be freed at tx_done
+ * @wait_count: count of waiters for this completion
  */
 struct rpmh_request {
 	struct tcs_request msg;
@@ -69,6 +72,7 @@ struct rpmh_request {
 	struct rpmh_client *rc;
 	int err;
 	struct rpmh_request *free;
+	atomic_t *wait_count;
 };
 
 /**
@@ -78,12 +82,14 @@ struct rpmh_request {
  * @cache: the list of cached requests
  * @lock: synchronize access to the controller data
  * @dirty: was the cache updated since flush
+ * @batch_cache: Cache sleep and wake requests sent as batch
  */
 struct rpmh_ctrlr {
 	struct rsc_drv *drv;
 	struct list_head cache;
 	spinlock_t lock;
 	bool dirty;
+	const struct rpmh_request *batch_cache[2 * RPMH_MAX_REQ_IN_BATCH];
 };
 
 /**
@@ -105,6 +111,7 @@ void rpmh_tx_done(const struct tcs_request *msg, int r)
 	struct rpmh_request *rpm_msg = container_of(msg, struct rpmh_request,
 						    msg);
 	struct completion *compl = rpm_msg->completion;
+	atomic_t *wc = rpm_msg->wait_count;
 
 	rpm_msg->err = r;
 
@@ -116,8 +123,13 @@ void rpmh_tx_done(const struct tcs_request *msg, int r)
 	kfree(rpm_msg->free);
 
 	/* Signal the blocking thread we are done */
-	if (compl)
-		complete(compl);
+	if (!compl)
+		return;
+
+	if (wc && !atomic_dec_and_test(wc))
+		return;
+
+	complete(compl);
 }
 EXPORT_SYMBOL(rpmh_tx_done);
 
@@ -339,6 +351,139 @@ int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 }
 EXPORT_SYMBOL(rpmh_write);
 
+static int cache_batch(struct rpmh_client *rc,
+		       struct rpmh_request **rpm_msg, int count)
+{
+	struct rpmh_ctrlr *rpm = rc->ctrlr;
+	unsigned long flags;
+	int ret = 0;
+	int index = 0;
+	int i;
+
+	spin_lock_irqsave(&rpm->lock, flags);
+	while (rpm->batch_cache[index])
+		index++;
+	if (index + count >=  2 * RPMH_MAX_REQ_IN_BATCH) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	for (i = 0; i < count; i++)
+		rpm->batch_cache[index + i] = rpm_msg[i];
+fail:
+	spin_unlock_irqrestore(&rpm->lock, flags);
+
+	return ret;
+}
+
+static int flush_batch(struct rpmh_client *rc)
+{
+	struct rpmh_ctrlr *rpm = rc->ctrlr;
+	const struct rpmh_request *rpm_msg;
+	unsigned long flags;
+	int ret = 0;
+	int i;
+
+	/* Send Sleep/Wake requests to the controller, expect no response */
+	spin_lock_irqsave(&rpm->lock, flags);
+	for (i = 0; rpm->batch_cache[i]; i++) {
+		rpm_msg = rpm->batch_cache[i];
+		ret = rpmh_rsc_write_ctrl_data(rc->ctrlr->drv, &rpm_msg->msg);
+		if (ret)
+			break;
+	}
+	spin_unlock_irqrestore(&rpm->lock, flags);
+
+	return ret;
+}
+
+static void invalidate_batch(struct rpmh_client *rc)
+{
+	struct rpmh_ctrlr *rpm = rc->ctrlr;
+	unsigned long flags;
+	int index = 0;
+	int i;
+
+	spin_lock_irqsave(&rpm->lock, flags);
+	while (rpm->batch_cache[index])
+		index++;
+	for (i = 0; i < index; i++) {
+		kfree(rpm->batch_cache[i]->free);
+		rpm->batch_cache[i] = NULL;
+	}
+	spin_unlock_irqrestore(&rpm->lock, flags);
+}
+
+/**
+ * rpmh_write_batch: Write multiple sets of RPMH commands and wait for the
+ * batch to finish.
+ *
+ * @rc: The RPMh handle got from rpmh_get_client
+ * @state: Active/sleep set
+ * @cmd: The payload data
+ * @n: The array of count of elements in each batch, 0 terminated.
+ *
+ * Write a request to the mailbox controller without caching. If the request
+ * state is ACTIVE, then the requests are treated as completion request
+ * and sent to the controller immediately. The function waits until all the
+ * commands are complete. If the request was to SLEEP or WAKE_ONLY, then the
+ * request is sent as fire-n-forget and no ack is expected.
+ *
+ * May sleep. Do not call from atomic contexts for ACTIVE_ONLY requests.
+ */
+int rpmh_write_batch(struct rpmh_client *rc, enum rpmh_state state,
+		     const struct tcs_cmd *cmd, u32 *n)
+{
+	struct rpmh_request *rpm_msg[RPMH_MAX_REQ_IN_BATCH] = { NULL };
+	DECLARE_COMPLETION_ONSTACK(compl);
+	atomic_t wait_count = ATOMIC_INIT(0);
+	int count = 0;
+	int ret, i;
+
+	if (IS_ERR_OR_NULL(rc) || !cmd || !n)
+		return -EINVAL;
+
+	while (n[count++] > 0)
+		;
+	count--;
+	if (!count || count > RPMH_MAX_REQ_IN_BATCH)
+		return -EINVAL;
+
+	for (i = 0; i < count; i++) {
+		rpm_msg[i] = __get_rpmh_msg_async(rc, state, cmd, n[i]);
+		if (IS_ERR_OR_NULL(rpm_msg[i])) {
+			ret = PTR_ERR(rpm_msg[i]);
+			for (; i >= 0; i--)
+				kfree(rpm_msg[i]->free);
+			return ret;
+		}
+		cmd += n[i];
+	}
+
+	if (state != RPMH_ACTIVE_ONLY_STATE)
+		return cache_batch(rc, rpm_msg, count);
+
+	atomic_set(&wait_count, count);
+
+	for (i = 0; i < count; i++) {
+		rpm_msg[i]->completion = &compl;
+		rpm_msg[i]->wait_count = &wait_count;
+		ret = rpmh_rsc_send_data(rc->ctrlr->drv, &rpm_msg[i]->msg);
+		if (ret) {
+			int j;
+
+			pr_err("Error(%d) sending RPMH message addr=%#x\n",
+			       ret, rpm_msg[i]->msg.cmds[0].addr);
+			for (j = i; j < count; j++)
+				rpmh_tx_done(&rpm_msg[j]->msg, ret);
+			break;
+		}
+	}
+
+	return wait_for_tx_done(rc, &compl, cmd[0].addr, cmd[0].data);
+}
+EXPORT_SYMBOL(rpmh_write_batch);
+
 static int is_req_valid(struct cache_req *req)
 {
 	return (req->sleep_val != UINT_MAX &&
@@ -386,6 +531,11 @@ int rpmh_flush(struct rpmh_client *rc)
 		return 0;
 	}
 
+	/* First flush the cached batch requests */
+	ret = flush_batch(rc);
+	if (ret)
+		return ret;
+
 	/*
 	 * Nobody else should be calling this function other than system PM,,
 	 * hence we can run without locks.
@@ -427,6 +577,8 @@ int rpmh_invalidate(struct rpmh_client *rc)
 	if (IS_ERR_OR_NULL(rc))
 		return -EINVAL;
 
+	invalidate_batch(rc);
+
 	rpm->dirty = true;
 
 	do {
diff --git a/include/soc/qcom/rpmh.h b/include/soc/qcom/rpmh.h
index 9e6de09e43f0..a5d5c57a4329 100644
--- a/include/soc/qcom/rpmh.h
+++ b/include/soc/qcom/rpmh.h
@@ -18,6 +18,9 @@ int rpmh_write(struct rpmh_client *rc, enum rpmh_state state,
 int rpmh_write_async(struct rpmh_client *rc, enum rpmh_state state,
 		     const struct tcs_cmd *cmd, u32 n);
 
+int rpmh_write_batch(struct rpmh_client *rc, enum rpmh_state state,
+		     const struct tcs_cmd *cmd, u32 *n);
+
 struct rpmh_client *rpmh_get_client(struct platform_device *pdev);
 
 int rpmh_flush(struct rpmh_client *rc);
@@ -40,6 +43,11 @@ static inline int rpmh_write_async(struct rpmh_client *rc,
 				   const struct tcs_cmd *cmd, u32 n)
 { return -ENODEV; }
 
+static inline int rpmh_write_batch(struct rpmh_client *rc,
+				   enum rpmh_state state,
+				   const struct tcs_cmd *cmd, u32 *n)
+{ return -ENODEV; }
+
 static inline int rpmh_flush(struct rpmh_client *rc)
 { return -ENODEV; }
 
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* [PATCH v4 10/10] drivers: qcom: rpmh-rsc: allow active requests from wake TCS
  2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
                   ` (8 preceding siblings ...)
  2018-03-09 23:25 ` [PATCH v4 09/10] drivers: qcom: rpmh: add support for batch RPMH request Lina Iyer
@ 2018-03-09 23:25 ` Lina Iyer
  9 siblings, 0 replies; 17+ messages in thread
From: Lina Iyer @ 2018-03-09 23:25 UTC (permalink / raw)
  To: andy.gross, david.brown, linux-arm-msm
  Cc: linux-soc, rnayak, bjorn.andersson, linux-kernel, sboyd, Lina Iyer

Some RSCs may only have sleep and wake TCS, i.e, there is no dedicated
TCS for active mode request, but drivers may still want to make active
requests from these RSCs. In such cases re-purpose the wake TCS to send
active state requests.

The requirement for this is that the driver is aware that the wake TCS
is being repurposed to send active request, hence the sleep and wake
TCSes be invalidated before the active request is sent.

Signed-off-by: Lina Iyer <ilina@codeaurora.org>
---
 drivers/soc/qcom/rpmh-rsc.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index 1dbccc4d0605..c1a460a8d955 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -214,6 +214,7 @@ static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv,
 					 const struct tcs_request *msg)
 {
 	int type;
+	struct tcs_group *tcs;
 
 	switch (msg->state) {
 	case RPMH_ACTIVE_ONLY_STATE:
@@ -229,7 +230,22 @@ static struct tcs_group *get_tcs_for_msg(struct rsc_drv *drv,
 		return ERR_PTR(-EINVAL);
 	}
 
-	return get_tcs_of_type(drv, type);
+	/*
+	 * If we are making an active request on a RSC that does not have a
+	 * dedicated TCS for active state use, then re-purpose a wake TCS to
+	 * send active votes.
+	 * NOTE: The driver must be aware that this RSC does not have a
+	 * dedicated AMC, and therefore would invalidate the sleep and wake
+	 * TCSes before making an active state request.
+	 */
+	tcs = get_tcs_of_type(drv, type);
+	if (msg->state == RPMH_ACTIVE_ONLY_STATE && IS_ERR(tcs)) {
+		tcs = get_tcs_of_type(drv, WAKE_TCS);
+		if (!IS_ERR(tcs))
+			rpmh_rsc_invalidate(drv);
+	}
+
+	return tcs;
 }
 
 static void send_tcs_response(struct tcs_response *resp)
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

^ permalink raw reply related	[flat|nested] 17+ messages in thread

* Re: [PATCH v4 03/10] drivers: qcom: rpmh-rsc: log RPMH requests in FTRACE
  2018-03-09 23:25 ` [PATCH v4 03/10] drivers: qcom: rpmh-rsc: log RPMH requests in FTRACE Lina Iyer
@ 2018-03-09 23:52   ` Steven Rostedt
  2018-03-10  4:47     ` Lina Iyer
  0 siblings, 1 reply; 17+ messages in thread
From: Steven Rostedt @ 2018-03-09 23:52 UTC (permalink / raw)
  To: Lina Iyer
  Cc: andy.gross, david.brown, linux-arm-msm, linux-soc, rnayak,
	bjorn.andersson, linux-kernel, sboyd

On Fri,  9 Mar 2018 16:25:36 -0700
Lina Iyer <ilina@codeaurora.org> wrote:

> Log sent RPMH requests and interrupt responses in FTRACE.
> 
> Cc: Steven Rostedt <rostedt@goodmis.org>
> Signed-off-by: Lina Iyer <ilina@codeaurora.org>
> ---
> 
> Changes in v4:
> 	- fix compilation issues, use __assign_str
> 	- use %#x instead of 0x%08x

Hmm, I don't believe libtraceevent (used by trace-cmd and perf)
supports "%#x". But that needs to be fixed in libtraceevent and you
don't need to modify this patch.

+			 __field(bool, wait)

Usually I would recommend against 'bool' in structures, but it
shouldn't affect the tracing code. Might want to look at how it
converts it in the /sys/kernel/tracing/events/rpmh/rpmh_send_msg/format
file. It probably makes no difference if it was an int.

Other than that... Looks good.

Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

-- Steve


> Changes in v3:
> 	- Use __string() instead of char *
> 	- fix TRACE_INCLUDE_PATH
> ---

^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH v4 03/10] drivers: qcom: rpmh-rsc: log RPMH requests in FTRACE
  2018-03-09 23:52   ` Steven Rostedt
@ 2018-03-10  4:47     ` Lina Iyer
  0 siblings, 0 replies; 17+ messages in thread
From: Lina Iyer @ 2018-03-10  4:47 UTC (permalink / raw)
  To: Steven Rostedt
  Cc: andy.gross, david.brown, linux-arm-msm, linux-soc, rnayak,
	bjorn.andersson, linux-kernel, sboyd

On Fri, Mar 09 2018 at 16:52 -0700, Steven Rostedt wrote:
>On Fri,  9 Mar 2018 16:25:36 -0700
>Lina Iyer <ilina@codeaurora.org> wrote:
>
>> Log sent RPMH requests and interrupt responses in FTRACE.
>>
>> Cc: Steven Rostedt <rostedt@goodmis.org>
>> Signed-off-by: Lina Iyer <ilina@codeaurora.org>
>> ---
>>
>> Changes in v4:
>> 	- fix compilation issues, use __assign_str
>> 	- use %#x instead of 0x%08x
>
>Hmm, I don't believe libtraceevent (used by trace-cmd and perf)
>supports "%#x". But that needs to be fixed in libtraceevent and you
>don't need to modify this patch.
>
>+			 __field(bool, wait)
>
>Usually I would recommend against 'bool' in structures, but it
>shouldn't affect the tracing code. Might want to look at how it
>converts it in the /sys/kernel/tracing/events/rpmh/rpmh_send_msg/format
>file. It probably makes no difference if it was an int.
>
>Other than that... Looks good.

field:bool wait;        offset:32;      size:1; signed:0;

-- Lina
>
>Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
>
>-- Steve
>
>
>> Changes in v3:
>> 	- Use __string() instead of char *
>> 	- fix TRACE_INCLUDE_PATH
>> ---

^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH v4 05/10] drivers: qcom: rpmh-rsc: write sleep/wake requests to TCS
  2018-03-09 23:25 ` [PATCH v4 05/10] drivers: qcom: rpmh-rsc: write sleep/wake requests to TCS Lina Iyer
@ 2018-03-17  0:35   ` Evan Green
  0 siblings, 0 replies; 17+ messages in thread
From: Evan Green @ 2018-03-17  0:35 UTC (permalink / raw)
  To: Lina Iyer
  Cc: Andy Gross, David Brown, linux-arm-msm, linux-soc,
	Rajendra Nayak, Bjorn Andersson, linux-kernel, sboyd

On Fri, Mar 9, 2018 at 3:27 PM Lina Iyer <ilina@codeaurora.org> wrote:

> Sleep and wake requests are sent when the application processor
> subsystem of the SoC is entering deep sleep states like in suspend.
> These requests help lower the system power requirements when the
> resources are not in use.

> Sleep and wake requests are written to the TCS slots but are not
> triggered at the time of writing. The TCS are triggered by the firmware
> after the last of the CPUs has executed its WFI. Since these requests
> may come in different batches of requests, it is the job of this
> controller driver to find and arrange the requests into the available
> TCSes.

> Signed-off-by: Lina Iyer <ilina@codeaurora.org>
> ---
>    drivers/soc/qcom/rpmh-internal.h |   9 ++-
>    drivers/soc/qcom/rpmh-rsc.c      | 120
+++++++++++++++++++++++++++++++++++++++
>    2 files changed, 128 insertions(+), 1 deletion(-)


Reviewed-by: Evan Green <evgreen@chromium.org>

^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH v4 07/10] drivers: qcom: rpmh: cache sleep/wake state requests
  2018-03-09 23:25 ` [PATCH v4 07/10] drivers: qcom: rpmh: cache sleep/wake state requests Lina Iyer
@ 2018-03-17  0:36   ` Evan Green
  0 siblings, 0 replies; 17+ messages in thread
From: Evan Green @ 2018-03-17  0:36 UTC (permalink / raw)
  To: Lina Iyer
  Cc: Andy Gross, David Brown, linux-arm-msm, linux-soc,
	Rajendra Nayak, Bjorn Andersson, linux-kernel, sboyd

On Fri, Mar 9, 2018 at 3:27 PM Lina Iyer <ilina@codeaurora.org> wrote:

> Active state requests are sent immediately to the mailbox controller,
> while sleep and wake state requests are cached in this driver to avoid
> taxing the mailbox controller repeatedly. The cached values will be sent
> to the controller when the rpmh_flush() is called.

> Generally, flushing is a system PM activity and may be called from the
> system PM drivers when the system is entering suspend or deeper sleep
> modes during cpuidle.

> Also allow invalidating the cached requests, so they may be re-populated
> again.

> Signed-off-by: Lina Iyer <ilina@codeaurora.org>
> ---

> Changes in v4:
>          - remove locking for ->dirty in invalidate
>          - fix send_single
> Changes in v3:
>          - Remove locking for flush function
>          - Improve comments
> ---
>   drivers/soc/qcom/rpmh.c | 203
+++++++++++++++++++++++++++++++++++++++++++++++-
>   include/soc/qcom/rpmh.h |  10 +++
>   2 files changed, 212 insertions(+), 1 deletion(-)


Reviewed-by: Evan Green <evgreen@chromium.org>

^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH v4 09/10] drivers: qcom: rpmh: add support for batch RPMH request
  2018-03-09 23:25 ` [PATCH v4 09/10] drivers: qcom: rpmh: add support for batch RPMH request Lina Iyer
@ 2018-03-17  0:36   ` Evan Green
  0 siblings, 0 replies; 17+ messages in thread
From: Evan Green @ 2018-03-17  0:36 UTC (permalink / raw)
  To: Lina Iyer
  Cc: Andy Gross, David Brown, linux-arm-msm, linux-soc,
	Rajendra Nayak, Bjorn Andersson, linux-kernel, sboyd

On Fri, Mar 9, 2018 at 3:26 PM Lina Iyer <ilina@codeaurora.org> wrote:

> Platform drivers need make a lot of resource state requests at the same
> time, say, at the start or end of an usecase. It can be quite
> inefficient to send each request separately. Instead they can give the
> RPMH library a batch of requests to be sent and wait on the whole
> transaction to be complete.

> rpmh_write_batch() is a blocking call that can be used to send multiple
> RPMH command sets. Each RPMH command set is set asynchronously and the
> API blocks until all the command sets are complete and receive their
> tx_done callbacks.

> Signed-off-by: Lina Iyer <ilina@codeaurora.org>
> ---

> Changes in v4:
>          - reorganize rpmh_write_batch()
>          - introduce wait_count here, instead of patch#4
> ---
>   drivers/soc/qcom/rpmh.c | 156
+++++++++++++++++++++++++++++++++++++++++++++++-
>   include/soc/qcom/rpmh.h |   8 +++
>   2 files changed, 162 insertions(+), 2 deletions(-)


Reviewed-by: Evan Green <evgreen@chromium.org>

^ permalink raw reply	[flat|nested] 17+ messages in thread

* Re: [PATCH v4 02/10] dt-bindings: introduce RPMH RSC bindings for Qualcomm SoCs
  2018-03-09 23:25 ` [PATCH v4 02/10] dt-bindings: introduce RPMH RSC bindings for Qualcomm SoCs Lina Iyer
@ 2018-03-26 22:22   ` Rob Herring
  0 siblings, 0 replies; 17+ messages in thread
From: Rob Herring @ 2018-03-26 22:22 UTC (permalink / raw)
  To: Lina Iyer
  Cc: andy.gross, david.brown, linux-arm-msm, linux-soc, rnayak,
	bjorn.andersson, linux-kernel, sboyd, devicetree

On Fri, Mar 09, 2018 at 04:25:35PM -0700, Lina Iyer wrote:
> Add device binding documentation for Qualcomm Technology Inc's RPMH RSC
> driver. The driver is used for communicating resource state requests for
> shared resources.
> 
> Cc: devicetree@vger.kernel.org
> Signed-off-by: Lina Iyer <ilina@codeaurora.org>
> ---
> 
> Changes in v3:
> 	- Move to soc/qcom
> 	- Amend text per Stephen's suggestions
> 
> Changes in v2:
> 	- Amend text to describe the registers in reg property
> 	- Add reg-names for the registers
> 	- Update examples to use GIC_SPI in interrupts instead of 0
> 	- Rephrase incorrect description
> 
> Changes in v3:
> 	- Fix unwanted capitalization
> 	- Remove clients from the examples, this doc does not describe
> 	  them
> 	- Rephrase introductory paragraph
> 	- Remove hardware specifics from DT bindings
> ---
>  .../devicetree/bindings/soc/qcom/rpmh-rsc.txt      | 127 +++++++++++++++++++++
>  1 file changed, 127 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt

Reviewed-by: Rob Herring <robh@kernel.org>

^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2018-03-26 22:22 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-03-09 23:25 [PATCH v4 00/10] drivers/qcom: add RPMH communication support Lina Iyer
2018-03-09 23:25 ` [PATCH v4 01/10] drivers: qcom: rpmh-rsc: add RPMH controller for QCOM SoCs Lina Iyer
2018-03-09 23:25 ` [PATCH v4 02/10] dt-bindings: introduce RPMH RSC bindings for Qualcomm SoCs Lina Iyer
2018-03-26 22:22   ` Rob Herring
2018-03-09 23:25 ` [PATCH v4 03/10] drivers: qcom: rpmh-rsc: log RPMH requests in FTRACE Lina Iyer
2018-03-09 23:52   ` Steven Rostedt
2018-03-10  4:47     ` Lina Iyer
2018-03-09 23:25 ` [PATCH v4 04/10] drivers: qcom: rpmh: add RPMH helper functions Lina Iyer
2018-03-09 23:25 ` [PATCH v4 05/10] drivers: qcom: rpmh-rsc: write sleep/wake requests to TCS Lina Iyer
2018-03-17  0:35   ` Evan Green
2018-03-09 23:25 ` [PATCH v4 06/10] drivers: qcom: rpmh-rsc: allow invalidation of sleep/wake TCS Lina Iyer
2018-03-09 23:25 ` [PATCH v4 07/10] drivers: qcom: rpmh: cache sleep/wake state requests Lina Iyer
2018-03-17  0:36   ` Evan Green
2018-03-09 23:25 ` [PATCH v4 08/10] drivers: qcom: rpmh: allow requests to be sent asynchronously Lina Iyer
2018-03-09 23:25 ` [PATCH v4 09/10] drivers: qcom: rpmh: add support for batch RPMH request Lina Iyer
2018-03-17  0:36   ` Evan Green
2018-03-09 23:25 ` [PATCH v4 10/10] drivers: qcom: rpmh-rsc: allow active requests from wake TCS Lina Iyer

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