[RFC 12/13] drm/i915/svm: Add support to en/disable SVM

Niranjana Vishwanathapura niranjana.vishwanathapura at intel.com
Fri Nov 22 20:57:33 UTC 2019


Add SVM as a capability and allow user to enable/disable SVM
functionality on a per context basis.

Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Cc: Jon Bloomfield <jon.bloomfield at intel.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Sudeep Dutt <sudeep.dutt at intel.com>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura at intel.com>
Signed-off-by: Venkata Sandeep Dhanalakota <venkata.s.dhanalakota at intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c   | 95 ++++++++++++++++++-
 drivers/gpu/drm/i915/gem/i915_gem_context.h   |  2 +
 .../gpu/drm/i915/gem/i915_gem_context_types.h |  1 +
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    |  6 ++
 drivers/gpu/drm/i915/gem/i915_gem_object.c    | 11 +++
 drivers/gpu/drm/i915/i915_drv.c               |  4 +-
 drivers/gpu/drm/i915/i915_drv.h               | 10 ++
 drivers/gpu/drm/i915/i915_getparam.c          |  3 +
 8 files changed, 128 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 46926478ed2e..bc6cbf3b3d97 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -76,6 +76,7 @@
 
 #include "i915_gem_context.h"
 #include "i915_globals.h"
+#include "i915_svm.h"
 #include "i915_trace.h"
 #include "i915_user_extensions.h"
 #include "i915_gem_ioctls.h"
@@ -965,6 +966,78 @@ int i915_gem_vm_destroy_ioctl(struct drm_device *dev, void *data,
 	return 0;
 }
 
+static int i915_gem_vm_setparam_ioctl(struct drm_device *dev, void *data,
+				      struct drm_file *file)
+{
+	struct drm_i915_file_private *file_priv = file->driver_priv;
+	struct drm_i915_gem_vm_param *args = data;
+	struct i915_address_space *vm;
+	int err = 0;
+	u32 id;
+
+	id = args->vm_id;
+	if (!id)
+		return -ENOENT;
+
+	err = mutex_lock_interruptible(&file_priv->vm_idr_lock);
+	if (err)
+		return err;
+
+	vm = idr_find(&file_priv->vm_idr, id);
+
+	mutex_unlock(&file_priv->vm_idr_lock);
+	if (!vm)
+		return -ENOENT;
+
+	switch (lower_32_bits(args->param)) {
+	case I915_GEM_VM_PARAM_SVM:
+		/* FIXME: Ensure ppgtt is empty before switching */
+		if (!i915_has_svm(file_priv->dev_priv))
+			err = -ENOTSUPP;
+		else if (args->value)
+			err = i915_svm_bind_mm(vm);
+		else
+			i915_svm_unbind_mm(vm);
+		break;
+	default:
+		err = -EINVAL;
+	}
+	return err;
+}
+
+static int i915_gem_vm_getparam_ioctl(struct drm_device *dev, void *data,
+				      struct drm_file *file)
+{
+	struct drm_i915_file_private *file_priv = file->driver_priv;
+	struct drm_i915_gem_vm_param *args = data;
+	struct i915_address_space *vm;
+	int err = 0;
+	u32 id;
+
+	id = args->vm_id;
+	if (!id)
+		return -ENOENT;
+
+	err = mutex_lock_interruptible(&file_priv->vm_idr_lock);
+	if (err)
+		return err;
+
+	vm = idr_find(&file_priv->vm_idr, id);
+
+	mutex_unlock(&file_priv->vm_idr_lock);
+	if (!vm)
+		return -ENOENT;
+
+	switch (lower_32_bits(args->param)) {
+	case I915_GEM_VM_PARAM_SVM:
+		args->value = i915_vm_is_svm_enabled(vm);
+		break;
+	default:
+		err = -EINVAL;
+	}
+	return err;
+}
+
 struct context_barrier_task {
 	struct i915_active base;
 	void (*task)(void *data);
@@ -2379,6 +2452,21 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
 	return ret;
 }
 
+int i915_gem_getparam_ioctl(struct drm_device *dev, void *data,
+			    struct drm_file *file)
+{
+	struct drm_i915_gem_context_param *args = data;
+	u32 class = upper_32_bits(args->param);
+
+	switch (class) {
+	case 0:
+		return i915_gem_context_getparam_ioctl(dev, data, file);
+	case 2:
+		return i915_gem_vm_getparam_ioctl(dev, data, file);
+	}
+	return -EINVAL;
+}
+
 int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
 				    struct drm_file *file)
 {
@@ -2401,14 +2489,15 @@ int i915_gem_setparam_ioctl(struct drm_device *dev, void *data,
 			    struct drm_file *file)
 {
 	struct drm_i915_gem_context_param *args = data;
-	u32 object_class = upper_32_bits(args->param);
+	u32 class = upper_32_bits(args->param);
 
-	switch (object_class) {
+	switch (class) {
 	case 0:
 		return i915_gem_context_setparam_ioctl(dev, data, file);
 	case 1:
 		return i915_gem_object_setparam_ioctl(dev, data, file);
-
+	case 2:
+		return i915_gem_vm_setparam_ioctl(dev, data, file);
 	}
 	return -EINVAL;
 }
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.h b/drivers/gpu/drm/i915/gem/i915_gem_context.h
index 0b17636cfea2..59eedb9e8ae5 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.h
@@ -175,6 +175,8 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data,
 				    struct drm_file *file_priv);
 int i915_gem_context_setparam_ioctl(struct drm_device *dev, void *data,
 				    struct drm_file *file_priv);
+int i915_gem_getparam_ioctl(struct drm_device *dev, void *data,
+			    struct drm_file *file);
 int i915_gem_setparam_ioctl(struct drm_device *dev, void *data,
 			    struct drm_file *file);
 int i915_gem_context_reset_stats_ioctl(struct drm_device *dev, void *data,
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index c060bc428f49..eefd2ee64c3f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -129,6 +129,7 @@ struct i915_gem_context {
 #define UCONTEXT_BANNABLE		2
 #define UCONTEXT_RECOVERABLE		3
 #define UCONTEXT_PERSISTENCE		4
+#define UCONTEXT_SVM_ENABLED		5
 
 	/**
 	 * @flags: small set of booleans
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 9d43ae6d643a..cbcfbf86ea61 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -25,6 +25,7 @@
 #include "i915_gem_clflush.h"
 #include "i915_gem_context.h"
 #include "i915_gem_ioctls.h"
+#include "i915_svm.h"
 #include "i915_trace.h"
 
 enum {
@@ -444,6 +445,11 @@ eb_validate_vma(struct i915_execbuffer *eb,
 	if (unlikely(entry->alignment && !is_power_of_2(entry->alignment)))
 		return -EINVAL;
 
+	/* Only allow user PINNED addresses for SVM enabled contexts */
+	if (unlikely(i915_vm_is_svm_enabled(eb->gem_context->vm) &&
+		     !(entry->flags & EXEC_OBJECT_PINNED)))
+		return -EINVAL;
+
 	/*
 	 * Offset can be used as input (EXEC_OBJECT_PINNED), reject
 	 * any non-page-aligned or non-canonical addresses.
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c
index dd88fa87b7fe..93d8aef22b92 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c
@@ -34,6 +34,7 @@
 #include "i915_gem_object_blt.h"
 #include "i915_gem_region.h"
 #include "i915_globals.h"
+#include "i915_svm.h"
 #include "i915_trace.h"
 
 static struct i915_global_object {
@@ -483,6 +484,16 @@ int __init i915_global_objects_init(void)
 bool
 i915_gem_object_svm_mapped(struct drm_i915_gem_object *obj)
 {
+	struct i915_vma *vma;
+
+	spin_lock(&obj->vma.lock);
+	list_for_each_entry(vma, &obj->vma.list, obj_link)
+		if (i915_vm_is_svm_enabled(vma->vm)) {
+			spin_unlock(&obj->vma.lock);
+			return true;
+		}
+
+	spin_unlock(&obj->vma.lock);
 	return false;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 740b4b9d39a8..f78912ffa03d 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2699,6 +2699,8 @@ static int i915_bind_ioctl(struct drm_device *dev, void *data,
 	vm = i915_gem_address_space_lookup(file->driver_priv, args->vm_id);
 	if (unlikely(!vm))
 		return -ENOENT;
+	if (unlikely(!i915_vm_is_svm_enabled(vm)))
+		return -ENOTSUPP;
 
 	switch (args->type) {
 	case I915_BIND_SVM_BUFFER:
@@ -2762,7 +2764,7 @@ static const struct drm_ioctl_desc i915_ioctls[] = {
 	DRM_IOCTL_DEF_DRV(I915_REG_READ, i915_reg_read_ioctl, DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(I915_GET_RESET_STATS, i915_gem_context_reset_stats_ioctl, DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(I915_GEM_USERPTR, i915_gem_userptr_ioctl, DRM_RENDER_ALLOW),
-	DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_GETPARAM, i915_gem_context_getparam_ioctl, DRM_RENDER_ALLOW),
+	DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_GETPARAM, i915_gem_getparam_ioctl, DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(I915_GEM_CONTEXT_SETPARAM, i915_gem_setparam_ioctl, DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(I915_PERF_OPEN, i915_perf_open_ioctl, DRM_RENDER_ALLOW),
 	DRM_IOCTL_DEF_DRV(I915_PERF_ADD_CONFIG, i915_perf_add_config_ioctl, DRM_RENDER_ALLOW),
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index f7051e6df656..2ea9d6ac9743 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -38,6 +38,7 @@
 #include <linux/i2c-algo-bit.h>
 #include <linux/backlight.h>
 #include <linux/hash.h>
+#include <linux/hmm.h>
 #include <linux/intel-iommu.h>
 #include <linux/kref.h>
 #include <linux/mm_types.h>
@@ -1735,6 +1736,15 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 /* Only valid when HAS_DISPLAY() is true */
 #define INTEL_DISPLAY_ENABLED(dev_priv) (WARN_ON(!HAS_DISPLAY(dev_priv)), !i915_modparams.disable_display)
 
+static inline bool i915_has_svm(struct drm_i915_private *dev_priv)
+{
+#ifdef CONFIG_DRM_I915_SVM
+	return INTEL_GEN(dev_priv) >= 8;
+#else
+	return false;
+#endif
+}
+
 static inline bool intel_vtd_active(void)
 {
 #ifdef CONFIG_INTEL_IOMMU
diff --git a/drivers/gpu/drm/i915/i915_getparam.c b/drivers/gpu/drm/i915/i915_getparam.c
index cf8a8c3ef047..3023b7b40f66 100644
--- a/drivers/gpu/drm/i915/i915_getparam.c
+++ b/drivers/gpu/drm/i915/i915_getparam.c
@@ -160,6 +160,9 @@ int i915_getparam_ioctl(struct drm_device *dev, void *data,
 	case I915_PARAM_PERF_REVISION:
 		value = i915_perf_ioctl_version();
 		break;
+	case I915_PARAM_HAS_SVM:
+		value = i915_has_svm(i915);
+		break;
 	default:
 		DRM_DEBUG("Unknown parameter %d\n", param->param);
 		return -EINVAL;
-- 
2.21.0.rc0.32.g243a4c7e27



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