[RFC 7/7] drm/i915: Allow configuring default request expiry via modparam

[Tvrtko Ursulin]

From: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

Module parameter is added (request_timeout_ms) to allow configuring the
default request/fence expiry.

Default value is inherited from CONFIG_DRM_I915_REQUEST_TIMEOUT.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c | 8 +++++---
 drivers/gpu/drm/i915/i915_params.c          | 5 +++++
 drivers/gpu/drm/i915/i915_params.h          | 1 +
 3 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 21c0176e27a0..1dae5e2514a9 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -866,7 +866,7 @@ static void __set_default_fence_expiry(struct i915_gem_context *ctx)
 		return;
 
 	/* Default expiry for user fences. */
-	ret = __set_watchdog(ctx, CONFIG_DRM_I915_REQUEST_TIMEOUT * 1000);
+	ret = __set_watchdog(ctx, i915->params.request_timeout_ms * 1000);
 	if (ret)
 		drm_notice(&i915->drm,
 			   "Failed to configure default fence expiry! (%d)",
@@ -1442,13 +1442,15 @@ __set_watchdog(struct i915_gem_context *ctx, unsigned long timeout_us)
 static int set_watchdog(struct i915_gem_context *ctx,
 			struct drm_i915_gem_context_param *args)
 {
+	struct drm_i915_private *i915 = ctx->i915;
+
 	if (args->size)
 		return -EINVAL;
 
 	/* Disallow disabling or configuring longer watchdog than default. */
-	if (IS_ACTIVE(CONFIG_DRM_I915_REQUEST_TIMEOUT) &&
+	if (i915->params.request_timeout_ms &&
 	    (!args->value ||
-	     args->value > CONFIG_DRM_I915_REQUEST_TIMEOUT * 1000))
+	     args->value > i915->params.request_timeout_ms * 1000))
 		return -EPERM;
 
 	return __set_watchdog(ctx, args->value);
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index 6939634e56ed..0320878d96b0 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -197,6 +197,11 @@ i915_param_named_unsafe(fake_lmem_start, ulong, 0400,
 	"Fake LMEM start offset (default: 0)");
 #endif
 
+#if CONFIG_DRM_I915_REQUEST_TIMEOUT
+i915_param_named_unsafe(request_timeout_ms, uint, 0600,
+			"Default request/fence/batch buffer expiration timeout.");
+#endif
+
 static __always_inline void _print_param(struct drm_printer *p,
 					 const char *name,
 					 const char *type,
diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h
index 48f47e44e848..34ebb0662547 100644
--- a/drivers/gpu/drm/i915/i915_params.h
+++ b/drivers/gpu/drm/i915/i915_params.h
@@ -72,6 +72,7 @@ struct drm_printer;
 	param(int, enable_dpcd_backlight, -1, 0600) \
 	param(char *, force_probe, CONFIG_DRM_I915_FORCE_PROBE, 0400) \
 	param(unsigned long, fake_lmem_start, 0, 0400) \
+	param(unsigned int, request_timeout_ms, CONFIG_DRM_I915_REQUEST_TIMEOUT, 0600) \
 	/* leave bools at the end to not create holes */ \
 	param(bool, enable_hangcheck, true, 0600) \
 	param(bool, load_detect_test, false, 0600) \
-- 
2.27.0