[Intel-gfx] [RFC-v21 12/13] drm/i915/pxp: User interface for Protected buffer
Huang, Sean Z
sean.z.huang at intel.com
Mon Jan 18 06:07:29 UTC 2021
From: Bommu Krishnaiah <krishnaiah.bommu at intel.com>
This api allow user mode to create Protected buffer and context creation.
rev21:
- Only allow set I915_CONTEXT_PARAM_PROTECTED_CONTENT during context
creation (i915_gem_context_create_ioctl), but not allow during
context set param (i915_gem_context_setparam_ioctl)
Signed-off-by: Bommu Krishnaiah <krishnaiah.bommu at intel.com>
Cc: Telukuntla Sreedhar <sreedhar.telukuntla at intel.com>
Cc: Kondapally Kalyan <kalyan.kondapally at intel.com>
Cc: Gupta Anshuman <Anshuman.Gupta at intel.com>
Cc: Huang Sean Z <sean.z.huang at intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 15 +++++++++--
drivers/gpu/drm/i915/gem/i915_gem_context.h | 5 ++++
drivers/gpu/drm/i915/gem/i915_gem_create.c | 27 ++++++++++++++++---
.../gpu/drm/i915/gem/i915_gem_object_types.h | 5 ++++
include/uapi/drm/i915_drm.h | 10 +++++++
5 files changed, 57 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 4d2f40cf237b..0b8e1b3887f4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -81,6 +81,8 @@
#include "i915_trace.h"
#include "i915_user_extensions.h"
+#include "pxp/intel_pxp.h"
+
#define ALL_L3_SLICES(dev) (1 << NUM_L3_SLICES(dev)) - 1
static struct i915_global_gem_context {
@@ -2004,8 +2006,12 @@ static int ctx_setparam(struct drm_i915_file_private *fpriv,
case I915_CONTEXT_PARAM_RECOVERABLE:
if (args->size)
ret = -EINVAL;
- else if (args->value)
- i915_gem_context_set_recoverable(ctx);
+ else if (args->value) {
+ if (!i915_gem_context_is_protected(ctx))
+ i915_gem_context_set_recoverable(ctx);
+ else
+ ret = -EPERM;
+ }
else
i915_gem_context_clear_recoverable(ctx);
break;
@@ -2052,6 +2058,7 @@ static int create_setparam(struct i915_user_extension __user *ext, void *data)
{
struct drm_i915_gem_context_create_ext_setparam local;
const struct create_ext *arg = data;
+ int ret;
if (copy_from_user(&local, ext, sizeof(local)))
return -EFAULT;
@@ -2059,6 +2066,10 @@ static int create_setparam(struct i915_user_extension __user *ext, void *data)
if (local.param.ctx_id)
return -EINVAL;
+ ret = intel_pxp_gem_context_create_param(arg->ctx, &local.param);
+ if (ret)
+ return ret;
+
return ctx_setparam(arg->fpriv, arg->ctx, &local.param);
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.h b/drivers/gpu/drm/i915/gem/i915_gem_context.h
index b5c908f3f4f2..173154fdc311 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.h
@@ -70,6 +70,11 @@ static inline void i915_gem_context_set_recoverable(struct i915_gem_context *ctx
set_bit(UCONTEXT_RECOVERABLE, &ctx->user_flags);
}
+static inline bool i915_gem_context_is_protected(struct i915_gem_context *ctx)
+{
+ return test_bit(UCONTEXT_PROTECTED, &ctx->user_flags);
+}
+
static inline void i915_gem_context_clear_recoverable(struct i915_gem_context *ctx)
{
clear_bit(UCONTEXT_RECOVERABLE, &ctx->user_flags);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_create.c b/drivers/gpu/drm/i915/gem/i915_gem_create.c
index 3ad3413c459f..c9b83217a6da 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_create.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_create.c
@@ -5,6 +5,7 @@
#include "gem/i915_gem_ioctls.h"
#include "gem/i915_gem_region.h"
+#include "pxp/intel_pxp.h"
#include "i915_drv.h"
#include "i915_user_extensions.h"
@@ -13,7 +14,8 @@ static int
i915_gem_create(struct drm_file *file,
struct intel_memory_region *mr,
u64 *size_p,
- u32 *handle_p)
+ u32 *handle_p,
+ u64 user_flags)
{
struct drm_i915_gem_object *obj;
u32 handle;
@@ -35,6 +37,8 @@ i915_gem_create(struct drm_file *file,
GEM_BUG_ON(size != obj->base.size);
+ obj->user_flags = user_flags;
+
ret = drm_gem_handle_create(file, &obj->base, &handle);
/* drop reference from allocate - handle holds it now */
i915_gem_object_put(obj);
@@ -89,11 +93,12 @@ i915_gem_dumb_create(struct drm_file *file,
return i915_gem_create(file,
intel_memory_region_by_type(to_i915(dev),
mem_type),
- &args->size, &args->handle);
+ &args->size, &args->handle, 0);
}
struct create_ext {
struct drm_i915_private *i915;
+ unsigned long user_flags;
};
static int __create_setparam(struct drm_i915_gem_object_param *args,
@@ -104,6 +109,17 @@ static int __create_setparam(struct drm_i915_gem_object_param *args,
return -EINVAL;
}
+ switch (lower_32_bits(args->param)) {
+ case I915_PARAM_PROTECTED_CONTENT:
+ if (args->size) {
+ return -EINVAL;
+ } else if (args->data) {
+ ext_data->user_flags = args->data;
+ return 0;
+ }
+ break;
+ }
+
return -EINVAL;
}
@@ -145,8 +161,13 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
if (ret)
return ret;
+ if (ext_data.user_flags & I915_BO_PROTECTED) {
+ if (!intel_pxp_gem_object_status(i915))
+ return -EINVAL;
+ }
+
return i915_gem_create(file,
intel_memory_region_by_type(i915,
INTEL_MEMORY_SYSTEM),
- &args->size, &args->handle);
+ &args->size, &args->handle, ext_data.user_flags);
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
index e2d9b7e1e152..90ac955463f4 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h
@@ -161,6 +161,11 @@ struct drm_i915_gem_object {
} mmo;
I915_SELFTEST_DECLARE(struct list_head st_link);
+ /**
+ * @user_flags: small set of booleans set by the user
+ */
+ unsigned long user_flags;
+#define I915_BO_PROTECTED BIT(0)
unsigned long flags;
#define I915_BO_ALLOC_CONTIGUOUS BIT(0)
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index aa232ded9951..17a6e3545570 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1744,6 +1744,16 @@ struct drm_i915_gem_object_param {
*/
#define I915_OBJECT_PARAM (1ull << 32)
+/*
+ * I915_PARAM_PROTECTED_CONTENT:
+ *
+ * If set to true (1) buffer contents is expected to be protected by
+ * PAVP encryption and requires decryption for scan out and processing.
+ * Protected buffers can only be used in PAVP protected contexts.
+ * A protected buffer may become invalid as a result of PAVP teardown.
+ */
+#define I915_PARAM_PROTECTED_CONTENT 0x1
+
__u64 param;
/* Data value or pointer */
--
2.17.1
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