On 11/1/2021 1:26 PM, Dixit, Ashutosh wrote:
On Sun, 31 Oct 2021 21:39:35 -0700, Belgaumkar, Vinay wrote:
Define helpers and struct members required to record boost info.
Boost frequency is initialized to RP0 at SLPC init. Also define num_waiters
which can track the pending boost requests.
Boost will be done by scheduling a worker thread. This will allow
us to make H2G calls inside an interrupt context. Initialize the
"to not make H2G calls from interrupt context" is probably better.
+static int slpc_force_min_freq(struct intel_guc_slpc *slpc, u32 freq)
+{
+ struct drm_i915_private *i915 = slpc_to_i915(slpc);
+ intel_wakeref_t wakeref;
+ int ret = 0;
+
+ lockdep_assert_held(&slpc->lock);
+
+ /**
nit: this I believe should just be
/*
ok.
/** I believe shows up in kerneldoc so shouldn't be used unless we want
something in kerneldoc.
+ * This function is a little different as compared to
+ * intel_guc_slpc_set_min_freq(). Softlimit will not be updated
+ * here since this is used to temporarily change min freq,
+ * for example, during a waitboost. Caller is responsible for
+ * checking bounds.
+ */
+
+ with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
+ ret = slpc_set_param(slpc,
+ SLPC_PARAM_GLOBAL_MIN_GT_UNSLICE_FREQ_MHZ,
+ freq);
+ if (ret)
+ drm_err(&i915->drm, "Unable to force min freq to %u: %d",
Probably drm_err_ratelimited since it's called at run time not only at
init? Not sure if drm_err_once suffizes, probably not.
Keeping it drm_err as discussed offline.
+ freq, ret);
+ }
+
+ return ret;
+}
+
+static void slpc_boost_work(struct work_struct *work)
+{
+ struct intel_guc_slpc *slpc = container_of(work, typeof(*slpc), boost_work);
+
+ /* Raise min freq to boost. It's possible that
+ * this is greater than current max. But it will
+ * certainly be limited by RP0. An error setting
+ * the min param is not fatal.
+ */
nit: do we follow the following format for multi-line comments,
Documentation/process/coding-style.rst mentions this:
/*
* Line 1
* Line 2
*/
Ok.
Thanks,
Vinay.
