drm/i915/gem: Make i915_gem_shrinker multi-gt aware

Where applicable, use for_each_gt instead of to_gt in the
i915_gem_shrinker functions to make them apply to more than just the
primary GT.  Specifically, this ensure i915_gem_shrink_all retires all
requests across all GTs, and this makes i915_gem_shrinker_vmap unmap
VMAs from all GTs.

v2: Pass correct GT to intel_gt_retire_requests(Andrzej).
v3: Remove unnecessary braces(Andi)
v4: Undo v3 to fix build failure.
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230926093028.23614-1-nirmoy.das@intel.com

drivers/gpu/drm/i915/gem/i915_gem_shrinker.c

@@ -14,6 +14,7 @@
 #include <linux/vmalloc.h>
 
 #include "gt/intel_gt_requests.h"
+#include "gt/intel_gt.h"
 
 #include "i915_trace.h"
 
@@ -119,7 +120,8 @@ i915_gem_shrink(struct i915_gem_ww_ctx *ww,
 	intel_wakeref_t wakeref = 0;
 	unsigned long count = 0;
 	unsigned long scanned = 0;
-	int err = 0;
+	int err = 0, i = 0;
+	struct intel_gt *gt;
 
 	/* CHV + VTD workaround use stop_machine(); need to trylock vm->mutex */
 	bool trylock_vm = !ww && intel_vm_no_concurrent_access_wa(i915);
@@ -147,9 +149,11 @@ i915_gem_shrink(struct i915_gem_ww_ctx *ww,
 	 * what we can do is give them a kick so that we do not keep idle
 	 * contexts around longer than is necessary.
 	 */
-	if (shrink & I915_SHRINK_ACTIVE)
-		/* Retire requests to unpin all idle contexts */
-		intel_gt_retire_requests(to_gt(i915));
+	if (shrink & I915_SHRINK_ACTIVE) {
+		for_each_gt(gt, i915, i)
+			/* Retire requests to unpin all idle contexts */
+			intel_gt_retire_requests(gt);
+	}
 
 	/*
 	 * As we may completely rewrite the (un)bound list whilst unbinding
@@ -389,6 +393,8 @@ i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr
 	struct i915_vma *vma, *next;
 	unsigned long freed_pages = 0;
 	intel_wakeref_t wakeref;
+	struct intel_gt *gt;
+	int i;
 
 	with_intel_runtime_pm(&i915->runtime_pm, wakeref)
 		freed_pages += i915_gem_shrink(NULL, i915, -1UL, NULL,
@@ -397,24 +403,26 @@ i915_gem_shrinker_vmap(struct notifier_block *nb, unsigned long event, void *ptr
 					       I915_SHRINK_VMAPS);
 
 	/* We also want to clear any cached iomaps as they wrap vmap */
-	mutex_lock(&to_gt(i915)->ggtt->vm.mutex);
-	list_for_each_entry_safe(vma, next,
-				 &to_gt(i915)->ggtt->vm.bound_list, vm_link) {
-		unsigned long count = i915_vma_size(vma) >> PAGE_SHIFT;
-		struct drm_i915_gem_object *obj = vma->obj;
-
-		if (!vma->iomap || i915_vma_is_active(vma))
-			continue;
+	for_each_gt(gt, i915, i) {
+		mutex_lock(&gt->ggtt->vm.mutex);
+		list_for_each_entry_safe(vma, next,
+					 &gt->ggtt->vm.bound_list, vm_link) {
+			unsigned long count = i915_vma_size(vma) >> PAGE_SHIFT;
+			struct drm_i915_gem_object *obj = vma->obj;
+
+			if (!vma->iomap || i915_vma_is_active(vma))
+				continue;
 
-		if (!i915_gem_object_trylock(obj, NULL))
-			continue;
+			if (!i915_gem_object_trylock(obj, NULL))
+				continue;
 
-		if (__i915_vma_unbind(vma) == 0)
-			freed_pages += count;
+			if (__i915_vma_unbind(vma) == 0)
+				freed_pages += count;
 
-		i915_gem_object_unlock(obj);
+			i915_gem_object_unlock(obj);
+		}
+		mutex_unlock(&gt->ggtt->vm.mutex);
 	}
-	mutex_unlock(&to_gt(i915)->ggtt->vm.mutex);
 
 	*(unsigned long *)ptr += freed_pages;
 	return NOTIFY_DONE;