[PATCH v12 14/17] drm/i915/guc/slpc: Add debugfs support to read/write/revert the parameters

[Sagar Arun Kamble <sagar.a.kamble@intel.com>]

Add support to set/read parameters and unset the parameters which will
revert them to default SLPC internal values. Explicit SLPC reset is needed
on setting/unsetting some of the parameters.

This patch adds two debugfs interfaces:
1. i915_guc_slpc_params: List of all parameters that Host can configure.
   Currently listing id and description of each.
2. i915_guc_slpc_param_ctl: This allows to change the parameters.
   Syntax is:
   * Update parameter with id <id> with value <value>:
     echo "write <id> <value>" > i915_guc_slpc_param_ctl
   * Read parameter with id <id>
     echo "read <id>" > i915_guc_slpc_param_ctl
     cat i915_guc_slpc_param_ctl
   * Revert parameter with id <id> to default value
     echo "revert <id>" > i915_guc_slpc_param_ctl.

v2: Moved the SLPC interfaces to i915_debugfs.c. Added error handling to
the range of parameters and parsing. Making use of intel_guc_slpc_enabled
instead of accessing status variable. Optimized token parsing.
(Michal Wajdeczko) s/i915_slpc_paramlist/i915_guc_slpc_params and
s/i915_slpc_param_ctl/i915_guc_slpc_param_ctl

v3: Rebase.

Signed-off-by: Sagar Arun Kamble <sagar.a.kamble@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Radoslaw Szwichtenberg <radoslaw.szwichtenberg@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Sujaritha Sundaresan <sujaritha.sundaresan@intel.com>
Cc: Jeff McGee <jeff.mcgee@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c        | 156 +++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_guc_slpc.c      |  87 ++++++++++++++++
 drivers/gpu/drm/i915/intel_guc_slpc.h      |  18 ++++
 drivers/gpu/drm/i915/intel_guc_slpc_fwif.h |  23 +++++
 4 files changed, 284 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 5c1231f..f90ad52 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2777,6 +2777,160 @@ const struct file_operations i915_guc_slpc_dcc_fops = {
 	.llseek	 = seq_lseek
 };
 
+static int i915_guc_slpc_params_info(struct seq_file *m, void *data)
+{
+	struct drm_i915_private *dev_priv = node_to_i915(m->private);
+	struct drm_printer p = drm_seq_file_printer(m);
+
+	if (!USES_GUC_SLPC(dev_priv))
+		return -ENODEV;
+
+	intel_guc_slpc_params_print(&dev_priv->guc.slpc, &p);
+
+	return 0;
+}
+
+static int slpc_param_ctl_show(struct seq_file *m, void *data)
+{
+	struct drm_i915_private *dev_priv = m->private;
+	struct intel_guc_slpc *slpc = &dev_priv->guc.slpc;
+
+	if (!USES_GUC_SLPC(dev_priv))
+		return -ENODEV;
+
+	if (slpc->debug.param_id >= SLPC_MAX_PARAM)
+		return -EINVAL;
+
+	BUILD_BUG_ON(ARRAY_SIZE(slpc_params_desc) != SLPC_MAX_PARAM);
+
+	seq_printf(m, "%s=%u, override=%s\n",
+			slpc_params_desc[slpc->debug.param_id],
+			slpc->debug.param_value,
+			yesno(!!slpc->debug.param_override));
+
+	return 0;
+}
+
+static int slpc_param_ctl_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, slpc_param_ctl_show, inode->i_private);
+}
+
+/*
+ * Parse SLPC parameter control strings: (Similar to Pipe CRC handling)
+ *   command: wsp* op wsp+ param id wsp+ [value] wsp*
+ *   op: "read"/"write"/"revert"
+ *   param id: slpc_param_id
+ *   value: u32 value
+ *   wsp: (#0x20 | #0x9 | #0xA)+
+ *
+ * eg.:
+ *  "read 0"		-> read SLPC_PARAM_TASK_ENABLE_GTPERF
+ *  "write 7 500"	-> set SLPC_PARAM_GLOBAL_MIN_GT_SLICE_FREQ_MHZ to 500MHz
+ *  "revert 7"		-> revert SLPC_PARAM_GLOBAL_MIN_GT_SLICE_FREQ_MHZ to
+ *			   default value.
+ */
+static int slpc_param_ctl_parse(char *buf, size_t len, int *op,
+				u32 *id, u32 *value)
+{
+#define MAX_WORDS 3
+	int n_words;
+	char *words[MAX_WORDS];
+	ssize_t ret;
+
+	n_words = buffer_tokenize(buf, words, MAX_WORDS);
+	if (!(n_words == 3) && !(n_words == 2)) {
+		DRM_DEBUG_DRIVER("tokenize failed, a command is %d words\n",
+				 MAX_WORDS);
+		return -EINVAL;
+	}
+
+	if (!strcmp(words[0], "read"))
+		*op = READ_OP;
+	else if (!strcmp(words[0], "write"))
+		*op = WRITE_OP;
+	else if (!strcmp(words[0], "revert"))
+		*op = REVERT_OP;
+	else {
+		DRM_DEBUG_DRIVER("unknown operation\n");
+		return -EINVAL;
+	}
+
+	ret = kstrtou32(words[1], 0, id);
+	if (ret)
+		return ret;
+
+	if (n_words == 3) {
+		ret = kstrtou32(words[2], 0, value);
+		if (ret)
+			return ret;
+	}
+
+	return (n_words-1);
+}
+
+static ssize_t slpc_param_ctl_write(struct file *file, const char __user *ubuf,
+				     size_t len, loff_t *offp)
+{
+	struct seq_file *m = file->private_data;
+	struct drm_i915_private *dev_priv = m->private;
+	struct intel_guc_slpc *slpc = &dev_priv->guc.slpc;
+	char *tmpbuf;
+	u32 id, value;
+	int op, params;
+	int ret = 0;
+
+	if (len == 0)
+		return 0;
+
+	if (len > 40) {
+		DRM_DEBUG_DRIVER("expected <40 chars into slpc_param_ctl\n");
+		return -E2BIG;
+	}
+
+	tmpbuf = kmalloc(len + 1, GFP_KERNEL);
+	if (!tmpbuf)
+		return -ENOMEM;
+
+	if (copy_from_user(tmpbuf, ubuf, len)) {
+		ret = -EFAULT;
+		goto out;
+	}
+	tmpbuf[len] = '\0';
+
+	params = slpc_param_ctl_parse(tmpbuf, len, &op, &id, &value);
+
+	if (params < 0 || id >= SLPC_MAX_PARAM) {
+		ret = -EINVAL;
+		goto out;
+	}
+
+	intel_runtime_pm_get(dev_priv);
+	mutex_lock(&slpc->lock);
+
+	ret = intel_guc_slpc_param_control(slpc, params, op, id, value);
+
+	mutex_unlock(&slpc->lock);
+	intel_runtime_pm_put(dev_priv);
+
+out:
+	kfree(tmpbuf);
+	if (ret < 0)
+		return ret;
+
+	*offp += len;
+	return len;
+}
+
+const struct file_operations i915_guc_slpc_param_ctl_fops = {
+	.owner = THIS_MODULE,
+	.open = slpc_param_ctl_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.write = slpc_param_ctl_write
+};
+
 static const char *psr2_live_status(u32 val)
 {
 	static const char * const live_status[] = {
@@ -4942,6 +5096,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_guc_log_dump", i915_guc_log_dump, 0},
 	{"i915_guc_load_err_log_dump", i915_guc_log_dump, 0, (void *)1},
 	{"i915_guc_stage_pool", i915_guc_stage_pool, 0},
+	{"i915_guc_slpc_params", i915_guc_slpc_params_info, 0},
 	{"i915_huc_load_status", i915_huc_load_status_info, 0},
 	{"i915_frequency_info", i915_frequency_info, 0},
 	{"i915_hangcheck_info", i915_hangcheck_info, 0},
@@ -5010,6 +5165,7 @@ static const struct i915_debugfs_files {
 	{"i915_guc_slpc_gtperf", &i915_guc_slpc_gtperf_fops},
 	{"i915_guc_slpc_balancer", &i915_guc_slpc_balancer_fops},
 	{"i915_guc_slpc_dcc", &i915_guc_slpc_dcc_fops},
+	{"i915_guc_slpc_param_ctl", &i915_guc_slpc_param_ctl_fops},
 	{"i915_hpd_storm_ctl", &i915_hpd_storm_ctl_fops},
 	{"i915_ipc_status", &i915_ipc_status_fops},
 	{"i915_drrs_ctl", &i915_drrs_ctl_fops}
diff --git a/drivers/gpu/drm/i915/intel_guc_slpc.c b/drivers/gpu/drm/i915/intel_guc_slpc.c
index 34a5963..7bd5e3e 100644
--- a/drivers/gpu/drm/i915/intel_guc_slpc.c
+++ b/drivers/gpu/drm/i915/intel_guc_slpc.c
@@ -578,6 +578,93 @@ int intel_guc_slpc_task_status(struct intel_guc_slpc *slpc, u64 *val,
 }
 
 /**
+ * intel_guc_slpc_params_print() - print parameters list.
+ * @slpc: pointer to intel_guc_slpc.
+ * @p: drm printer
+ *
+ * This function will print SLPC parameters id and their description.
+ *
+ */
+void intel_guc_slpc_params_print(struct intel_guc_slpc *slpc,
+				 struct drm_printer *p)
+{
+	int i;
+
+	BUILD_BUG_ON(ARRAY_SIZE(slpc_params_desc) != SLPC_MAX_PARAM);
+
+	drm_printf(p, "Param id\tParam description\n");
+	for (i = 0; i < ARRAY_SIZE(slpc_params_desc); i++)
+		drm_printf(p, "%8d\t%s\n", i, slpc_params_desc[i]);
+}
+
+/**
+ * intel_guc_slpc_param_control() - read/write/revert parameter.
+ * @slpc: pointer to intel_guc_slpc.
+ * @params: number of parameters
+ * @op: operation (read, write, revert)
+ * @id: parameter id
+ * @value: parameter value
+ *
+ * This function will create object to be shared with GuC SLPC and
+ * initialize it with required initial parameter values for various
+ * SLPC knobs such as min frequency limit, enabling/disabling of SLPC
+ * tasks etc.
+ *
+ * Return: 0 on success, non-zero error code on failure.
+ */
+int intel_guc_slpc_param_control(struct intel_guc_slpc *slpc,
+				 u32 params, u32 op, u32 id, u32 value)
+{
+	int ret = 0;
+
+	GEM_BUG_ON(!slpc->vma);
+
+	lockdep_assert_held(&slpc->lock);
+
+	if (op == READ_OP) {
+		if (params != 1) {
+			ret = -EINVAL;
+			goto out;
+		}
+		slpc_get_param(slpc, id,
+			       &slpc->debug.param_override,
+			       &slpc->debug.param_value);
+		slpc->debug.param_id = id;
+	} else if ((op == WRITE_OP) || (op == REVERT_OP)) {
+		if ((id >= SLPC_PARAM_TASK_ENABLE_GTPERF) &&
+		    (id <= SLPC_PARAM_TASK_DISABLE_DCC)) {
+			DRM_DEBUG_DRIVER("Tasks are not controlled by "
+					 "this interface\n");
+			ret = -EINVAL;
+			goto out;
+		}
+
+		/*
+		 * After updating parameters, RESET event has to be sent to GuC
+		 * SLPC for ensuring parameters take effect.
+		 */
+		if (op == WRITE_OP) {
+			if (params != 2) {
+				ret = -EINVAL;
+				goto out;
+			}
+			slpc_set_param(slpc, id, value);
+		} else {
+			if (params != 1) {
+				ret = -EINVAL;
+				goto out;
+			}
+			slpc_unset_param(slpc, id);
+		}
+		host2guc_slpc_reset(slpc);
+	}
+
+out:
+
+	return ret;
+}
+
+/**
  * intel_guc_slpc_init() - Initialize the SLPC shared data structure.
  * @slpc: pointer to intel_guc_slpc.
  *
diff --git a/drivers/gpu/drm/i915/intel_guc_slpc.h b/drivers/gpu/drm/i915/intel_guc_slpc.h
index 51189b3..693343e 100644
--- a/drivers/gpu/drm/i915/intel_guc_slpc.h
+++ b/drivers/gpu/drm/i915/intel_guc_slpc.h
@@ -8,6 +8,8 @@
 
 #include <intel_guc_slpc_fwif.h>
 
+struct drm_printer;
+
 struct intel_guc_slpc {
 	/* Protects access to vma and SLPC actions */
 	struct mutex lock;
@@ -16,12 +18,28 @@ struct intel_guc_slpc {
 	/* i915 cached SLPC frequency limits */
 	u32 min_unslice_freq;
 	u32 max_unslice_freq;
+
+	struct {
+		u32 param_id;
+		u32 param_value;
+		u32 param_override;
+	} debug;
+};
+
+enum {
+	READ_OP,
+	WRITE_OP,
+	REVERT_OP
 };
 
 int intel_guc_slpc_task_control(struct intel_guc_slpc *slpc, u64 val,
 				u32 enable_id, u32 disable_id);
 int intel_guc_slpc_task_status(struct intel_guc_slpc *slpc, u64 *val,
 			       u32 enable_id, u32 disable_id);
+void intel_guc_slpc_params_print(struct intel_guc_slpc *slpc,
+				 struct drm_printer *p);
+int intel_guc_slpc_param_control(struct intel_guc_slpc *slpc,
+				 u32 params, u32 op, u32 id, u32 value);
 
 int intel_guc_slpc_init(struct intel_guc_slpc *slpc);
 int intel_guc_slpc_enable(struct intel_guc_slpc *slpc);
diff --git a/drivers/gpu/drm/i915/intel_guc_slpc_fwif.h b/drivers/gpu/drm/i915/intel_guc_slpc_fwif.h
index 9400af4..65bbb03 100644
--- a/drivers/gpu/drm/i915/intel_guc_slpc_fwif.h
+++ b/drivers/gpu/drm/i915/intel_guc_slpc_fwif.h
@@ -71,6 +71,29 @@ enum slpc_param_id {
 	SLPC_KMD_MAX_PARAM = 32,
 };
 
+static const char * const slpc_params_desc[] = {
+	"Enable task GTPERF",
+	"Disable task GTPERF",
+	"Enable task BALANCER",
+	"Disable task BALANCER",
+	"Enable task DCC",
+	"Disable task DCC",
+	"Minimum GT frequency request for unslice",
+	"Maximum GT frequency request for unslice",
+	"Minimum GT frequency request for slice",
+	"Maximum GT frequency request for slice",
+	"If non-zero, will slow down frame-based apps to this frame-rate",
+	"Lock GT frequency request to RPe",
+	"Set to TRUE to enable slowing framerate",
+	"Prevent from changing the RC mode",
+	"Override fused value of unslice RP0",
+	"Override fused value of slice RP0",
+	"TRUE means enable Intelligent Bias Control",
+	"TRUE = enable eval mode when transitioning from idle to active.",
+	"FALSE = disable eval mode completely",
+	"Enable IBC when non-Gaming Mode is enabled"
+};
+
 enum slpc_global_state {
 	SLPC_GLOBAL_STATE_NOT_RUNNING = 0,
 	SLPC_GLOBAL_STATE_INITIALIZING = 1,
-- 
2.7.4

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