[Intel-gfx] [PATCH 10/12] drm/i915: Disable use of stolen area by User when Intel RST is present

[ankitprasad.r.sharma at intel.com]

From: Ankitprasad Sharma <ankitprasad.r.sharma at intel.com>

The BIOS RapidStartTechnology may corrupt the stolen memory across S3
suspend due to unalarmed hibernation, in which case we will not be able
to preserve the User data stored in the stolen region. Hence this patch
tries to identify presence of the RST device on the ACPI bus, and
disables use of stolen memory (for persistent data) if found.

v2: Updated comment, updated/corrected new functions private to driver
(Chris/Tvrtko)

v3: Disabling stolen by default, wait till required acpi changes to
detect device presence are pulled in (Ankit)

v4: Enabled stolen by default as required acpi changes are merged
(Ankit)

v5: renamed variable, is IS_ENABLED() in place of #ifdef, use char*
instead of structures (Lukas)

Signed-off-by: Ankitprasad Sharma <ankitprasad.r.sharma at intel.com>
Cc: Lukas Wunner <lukas at wunner.de>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h        | 11 +++++++++++
 drivers/gpu/drm/i915/i915_gem.c        |  8 ++++++++
 drivers/gpu/drm/i915/i915_gem_stolen.c | 12 ++++++++++++
 drivers/gpu/drm/i915/intel_acpi.c      |  7 +++++++
 4 files changed, 38 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c7fe863..37f9de8 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1326,6 +1326,16 @@ struct i915_gem_mm {
 	 */
 	bool busy;
 
+	/**
+	 * Stolen will be lost upon hibernate (as the memory is unpowered).
+	 * Across resume, we expect stolen to be intact - however, it may
+	 * also be utililised by third parties (e.g. Intel RapidStart
+	 * Technology) and if so we have to assume that any data stored in
+	 * stolen across resume is lost and we set this flag to indicate that
+	 * the stolen memory is volatile.
+	 */
+	bool volatile_stolen;
+
 	/* the indicator for dispatch video commands on two BSD rings */
 	unsigned int bsd_ring_dispatch_index;
 
@@ -3559,6 +3569,7 @@ static inline int intel_opregion_get_panel_type(struct drm_device *dev)
 #endif
 
 /* intel_acpi.c */
+bool intel_detect_acpi_rst(void);
 #ifdef CONFIG_ACPI
 extern void intel_register_dsm_handler(void);
 extern void intel_unregister_dsm_handler(void);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 48959cf..45fd049 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -391,8 +391,16 @@ static struct drm_i915_gem_object *
 i915_gem_alloc_object_stolen(struct drm_device *dev, size_t size)
 {
 	struct drm_i915_gem_object *obj;
+	struct drm_i915_private *dev_priv = dev->dev_private;
 	int ret;
 
+	if (dev_priv->mm.volatile_stolen) {
+		/* Stolen may be overwritten by external parties
+		 * so unsuitable for persistent user data.
+		 */
+		return ERR_PTR(-ENODEV);
+	}
+
 	mutex_lock(&dev->struct_mutex);
 	obj = i915_gem_object_create_stolen(dev, size);
 	if (IS_ERR(obj))
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index d9756ee..ef28af6 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -490,6 +490,18 @@ int i915_gem_init_stolen(struct drm_device *dev)
 	 */
 	drm_mm_init(&dev_priv->mm.stolen, 0, ggtt->stolen_usable_size);
 
+	/* If the stolen region can be modified behind our backs upon suspend,
+	 * then we cannot use it to store nonvolatile contents (i.e user data)
+	 * as it will be corrupted upon resume.
+	 */
+	dev_priv->mm.volatile_stolen = false;
+	if (IS_ENABLED(CONFIG_SUSPEND)) {
+		/* BIOSes using RapidStart Technology have been reported
+		 * to overwrite stolen across S3, not just S4.
+		 */
+		dev_priv->mm.volatile_stolen = intel_detect_acpi_rst();
+	}
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/intel_acpi.c b/drivers/gpu/drm/i915/intel_acpi.c
index eb638a1..05fd67f 100644
--- a/drivers/gpu/drm/i915/intel_acpi.c
+++ b/drivers/gpu/drm/i915/intel_acpi.c
@@ -23,6 +23,8 @@ static const u8 intel_dsm_guid[] = {
 	0x0f, 0x13, 0x17, 0xb0, 0x1c, 0x2c
 };
 
+static const char *irst_id = "INT3392";
+
 static char *intel_dsm_port_name(u8 id)
 {
 	switch (id) {
@@ -162,3 +164,8 @@ void intel_register_dsm_handler(void)
 void intel_unregister_dsm_handler(void)
 {
 }
+
+bool intel_detect_acpi_rst(void)
+{
+	return acpi_dev_present(irst_id);
+}
-- 
1.9.1