From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 88C7AC432BE for ; Tue, 31 Aug 2021 21:30:33 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5600B6054E for ; Tue, 31 Aug 2021 21:30:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 5600B6054E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 931396E0CA; Tue, 31 Aug 2021 21:30:32 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id E8FAE6E0CA; Tue, 31 Aug 2021 21:30:31 +0000 (UTC) X-IronPort-AV: E=McAfee;i="6200,9189,10093"; a="215440732" X-IronPort-AV: E=Sophos;i="5.84,367,1620716400"; d="scan'208";a="215440732" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Aug 2021 14:30:31 -0700 X-IronPort-AV: E=Sophos;i="5.84,367,1620716400"; d="scan'208";a="531363015" Received: from sramak6-mobl.amr.corp.intel.com (HELO intel.com) ([10.255.38.110]) by fmsmga003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 31 Aug 2021 14:30:29 -0700 Date: Tue, 31 Aug 2021 17:30:28 -0400 From: Rodrigo Vivi To: Daniele Ceraolo Spurio Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, Bommu Krishnaiah , Chris Wilson , Lionel Landwerlin , Jason Ekstrand , Daniel Vetter Subject: Re: [PATCH v7 10/17] drm/i915/pxp: interfaces for using protected objects Message-ID: References: <20210828012738.317661-1-daniele.ceraolospurio@intel.com> <20210828012738.317661-11-daniele.ceraolospurio@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210828012738.317661-11-daniele.ceraolospurio@intel.com> X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Fri, Aug 27, 2021 at 06:27:31PM -0700, Daniele Ceraolo Spurio wrote: > This api allow user mode to create protected buffers and to mark > contexts as making use of such objects. Only when using contexts > marked in such a way is the execution guaranteed to work as expected. > > Contexts can only be marked as using protected content at creation time > (i.e. the parameter is immutable) and they must be both bannable and not > recoverable. Given that the protected session gets invalidated on > suspend, contexts created this way hold a runtime pm wakeref until > they're either destroyed or invalidated. > > All protected objects and contexts will be considered invalid when the > PXP session is destroyed and all new submissions using them will be > rejected. All intel contexts within the invalidated gem contexts will be > marked banned. Userspace can detect that an invalidation has occurred via > the RESET_STATS ioctl, where we report it the same way as a ban due to a > hang. > > v5: squash patches, rebase on proto_ctx, update kerneldoc > > v6: rebase on obj create_ext changes > > v7: Use session counter to check if an object it valid, hold wakeref in > context, don't add a new flag to RESET_STATS (Daniel) > > Signed-off-by: Daniele Ceraolo Spurio > Signed-off-by: Bommu Krishnaiah > Cc: Rodrigo Vivi > Cc: Chris Wilson > Cc: Lionel Landwerlin > Cc: Jason Ekstrand > Cc: Daniel Vetter > Reviewed-by: Rodrigo Vivi #v5 > --- > drivers/gpu/drm/i915/gem/i915_gem_context.c | 98 ++++++++++++++++--- > drivers/gpu/drm/i915/gem/i915_gem_context.h | 6 ++ > .../gpu/drm/i915/gem/i915_gem_context_types.h | 28 ++++++ > drivers/gpu/drm/i915/gem/i915_gem_create.c | 72 ++++++++++---- > .../gpu/drm/i915/gem/i915_gem_execbuffer.c | 18 ++++ > drivers/gpu/drm/i915/gem/i915_gem_object.c | 1 + > drivers/gpu/drm/i915/gem/i915_gem_object.h | 6 ++ > .../gpu/drm/i915/gem/i915_gem_object_types.h | 8 ++ > .../gpu/drm/i915/gem/selftests/mock_context.c | 4 +- > drivers/gpu/drm/i915/pxp/intel_pxp.c | 83 ++++++++++++++++ > drivers/gpu/drm/i915/pxp/intel_pxp.h | 12 +++ > drivers/gpu/drm/i915/pxp/intel_pxp_session.c | 6 ++ > drivers/gpu/drm/i915/pxp/intel_pxp_types.h | 9 ++ > include/uapi/drm/i915_drm.h | 55 ++++++++++- > 14 files changed, 371 insertions(+), 35 deletions(-) > > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c > index fd169cf2f75a..f411e26768fd 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_context.c > +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c > @@ -77,6 +77,8 @@ > #include "gt/intel_gpu_commands.h" > #include "gt/intel_ring.h" > > +#include "pxp/intel_pxp.h" > + > #include "i915_gem_context.h" > #include "i915_trace.h" > #include "i915_user_extensions.h" > @@ -186,10 +188,13 @@ static int validate_priority(struct drm_i915_private *i915, > return 0; > } > > -static void proto_context_close(struct i915_gem_proto_context *pc) > +static void proto_context_close(struct drm_i915_private *i915, > + struct i915_gem_proto_context *pc) > { > int i; > > + if (pc->pxp_wakeref) > + intel_runtime_pm_put(&i915->runtime_pm, pc->pxp_wakeref); > if (pc->vm) > i915_vm_put(pc->vm); > if (pc->user_engines) { > @@ -241,6 +246,33 @@ static int proto_context_set_persistence(struct drm_i915_private *i915, > return 0; > } > > +static int proto_context_set_protected(struct drm_i915_private *i915, > + struct i915_gem_proto_context *pc, > + bool protected) > +{ > + int ret = 0; > + > + if (!intel_pxp_is_enabled(&i915->gt.pxp)) { > + ret = -ENODEV; > + } else if (!protected) { > + pc->uses_protected_content = false; > + } else if ((pc->user_flags & BIT(UCONTEXT_RECOVERABLE)) || > + !(pc->user_flags & BIT(UCONTEXT_BANNABLE))) { > + ret = -EPERM; > + } else { > + pc->uses_protected_content = true; > + > + /* > + * protected context usage requires the PXP session to be up, > + * which in turn requires the device to be active. > + */ > + pc->pxp_wakeref = intel_runtime_pm_get(&i915->runtime_pm); > + ret = intel_pxp_wait_for_arb_start(&i915->gt.pxp); > + } > + > + return ret; > +} > + > static struct i915_gem_proto_context * > proto_context_create(struct drm_i915_private *i915, unsigned int flags) > { > @@ -269,7 +301,7 @@ proto_context_create(struct drm_i915_private *i915, unsigned int flags) > return pc; > > proto_close: > - proto_context_close(pc); > + proto_context_close(i915, pc); > return err; > } > > @@ -693,6 +725,8 @@ static int set_proto_ctx_param(struct drm_i915_file_private *fpriv, > ret = -EPERM; > else if (args->value) > pc->user_flags |= BIT(UCONTEXT_BANNABLE); > + else if (pc->uses_protected_content) > + ret = -EPERM; > else > pc->user_flags &= ~BIT(UCONTEXT_BANNABLE); > break; > @@ -700,10 +734,12 @@ static int set_proto_ctx_param(struct drm_i915_file_private *fpriv, > case I915_CONTEXT_PARAM_RECOVERABLE: > if (args->size) > ret = -EINVAL; > - else if (args->value) > - pc->user_flags |= BIT(UCONTEXT_RECOVERABLE); > - else > + else if (!args->value) > pc->user_flags &= ~BIT(UCONTEXT_RECOVERABLE); > + else if (pc->uses_protected_content) > + ret = -EPERM; > + else > + pc->user_flags |= BIT(UCONTEXT_RECOVERABLE); > break; > > case I915_CONTEXT_PARAM_PRIORITY: > @@ -731,6 +767,11 @@ static int set_proto_ctx_param(struct drm_i915_file_private *fpriv, > args->value); > break; > > + case I915_CONTEXT_PARAM_PROTECTED_CONTENT: > + ret = proto_context_set_protected(fpriv->dev_priv, pc, > + args->value); > + break; > + > case I915_CONTEXT_PARAM_NO_ZEROMAP: > case I915_CONTEXT_PARAM_BAN_PERIOD: > case I915_CONTEXT_PARAM_RINGSIZE: > @@ -1215,6 +1256,9 @@ static void context_close(struct i915_gem_context *ctx) > if (ctx->syncobj) > drm_syncobj_put(ctx->syncobj); > > + if (ctx->pxp_wakeref) > + intel_runtime_pm_put(&ctx->i915->runtime_pm, ctx->pxp_wakeref); > + > ctx->file_priv = ERR_PTR(-EBADF); > > /* > @@ -1363,6 +1407,11 @@ i915_gem_create_context(struct drm_i915_private *i915, > goto err_engines; > } > > + if (pc->uses_protected_content) { > + ctx->pxp_wakeref = intel_runtime_pm_get(&i915->runtime_pm); > + ctx->uses_protected_content = true; > + } > + > trace_i915_context_create(ctx); > > return ctx; > @@ -1434,7 +1483,7 @@ int i915_gem_context_open(struct drm_i915_private *i915, > } > > ctx = i915_gem_create_context(i915, pc); > - proto_context_close(pc); > + proto_context_close(i915, pc); > if (IS_ERR(ctx)) { > err = PTR_ERR(ctx); > goto err; > @@ -1461,7 +1510,7 @@ void i915_gem_context_close(struct drm_file *file) > unsigned long idx; > > xa_for_each(&file_priv->proto_context_xa, idx, pc) > - proto_context_close(pc); > + proto_context_close(file_priv->dev_priv, pc); > xa_destroy(&file_priv->proto_context_xa); > mutex_destroy(&file_priv->proto_context_lock); > > @@ -1761,6 +1810,18 @@ static int set_priority(struct i915_gem_context *ctx, > return 0; > } > > +static int get_protected(struct i915_gem_context *ctx, > + struct drm_i915_gem_context_param *args) > +{ > + if (!intel_pxp_is_enabled(&ctx->i915->gt.pxp)) > + return -ENODEV; > + > + args->size = 0; > + args->value = i915_gem_context_uses_protected_content(ctx); > + > + return 0; > +} > + > static int ctx_setparam(struct drm_i915_file_private *fpriv, > struct i915_gem_context *ctx, > struct drm_i915_gem_context_param *args) > @@ -1784,6 +1845,8 @@ static int ctx_setparam(struct drm_i915_file_private *fpriv, > ret = -EPERM; > else if (args->value) > i915_gem_context_set_bannable(ctx); > + else if (i915_gem_context_uses_protected_content(ctx)) > + ret = -EPERM; /* can't clear this for protected contexts */ > else > i915_gem_context_clear_bannable(ctx); > break; > @@ -1791,10 +1854,12 @@ 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 > + else if (!args->value) > i915_gem_context_clear_recoverable(ctx); > + else if (i915_gem_context_uses_protected_content(ctx)) > + ret = -EPERM; /* can't set this for protected contexts */ > + else > + i915_gem_context_set_recoverable(ctx); > break; > > case I915_CONTEXT_PARAM_PRIORITY: > @@ -1809,6 +1874,7 @@ static int ctx_setparam(struct drm_i915_file_private *fpriv, > ret = set_persistence(ctx, args); > break; > > + case I915_CONTEXT_PARAM_PROTECTED_CONTENT: > case I915_CONTEXT_PARAM_NO_ZEROMAP: > case I915_CONTEXT_PARAM_BAN_PERIOD: > case I915_CONTEXT_PARAM_RINGSIZE: > @@ -1887,7 +1953,7 @@ finalize_create_context_locked(struct drm_i915_file_private *file_priv, > > old = xa_erase(&file_priv->proto_context_xa, id); > GEM_BUG_ON(old != pc); > - proto_context_close(pc); > + proto_context_close(file_priv->dev_priv, pc); > > /* One for the xarray and one for the caller */ > return i915_gem_context_get(ctx); > @@ -1973,7 +2039,7 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data, > goto err_pc; > } > > - proto_context_close(ext_data.pc); > + proto_context_close(i915, ext_data.pc); > gem_context_register(ctx, ext_data.fpriv, id); > } else { > ret = proto_context_register(ext_data.fpriv, ext_data.pc, &id); > @@ -1987,7 +2053,7 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data, > return 0; > > err_pc: > - proto_context_close(ext_data.pc); > + proto_context_close(i915, ext_data.pc); > return ret; > } > > @@ -2018,7 +2084,7 @@ int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data, > GEM_WARN_ON(ctx && pc); > > if (pc) > - proto_context_close(pc); > + proto_context_close(file_priv->dev_priv, pc); > > if (ctx) > context_close(ctx); > @@ -2137,6 +2203,10 @@ int i915_gem_context_getparam_ioctl(struct drm_device *dev, void *data, > args->value = i915_gem_context_is_persistent(ctx); > break; > > + case I915_CONTEXT_PARAM_PROTECTED_CONTENT: > + ret = get_protected(ctx, args); > + break; > + > case I915_CONTEXT_PARAM_NO_ZEROMAP: > case I915_CONTEXT_PARAM_BAN_PERIOD: > case I915_CONTEXT_PARAM_ENGINES: > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.h b/drivers/gpu/drm/i915/gem/i915_gem_context.h > index 18060536b0c2..a62e4454e829 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_context.h > +++ b/drivers/gpu/drm/i915/gem/i915_gem_context.h > @@ -108,6 +108,12 @@ i915_gem_context_clear_user_engines(struct i915_gem_context *ctx) > clear_bit(CONTEXT_USER_ENGINES, &ctx->flags); > } > > +static inline bool > +i915_gem_context_uses_protected_content(const struct i915_gem_context *ctx) > +{ > + return ctx->uses_protected_content; > +} > + > /* i915_gem_context.c */ > void i915_gem_init__contexts(struct drm_i915_private *i915); > > 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 94c03a97cb77..8e59a86ef5a1 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h > +++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h > @@ -198,6 +198,12 @@ struct i915_gem_proto_context { > > /** @single_timeline: See See &i915_gem_context.syncobj */ > bool single_timeline; > + > + /** @uses_protected_content: See &i915_gem_context.uses_protected_content */ > + bool uses_protected_content; > + > + /** @pxp_wakeref: See &i915_gem_context.pxp_wakeref */ > + intel_wakeref_t pxp_wakeref; > }; > > /** > @@ -309,6 +315,28 @@ struct i915_gem_context { > #define CONTEXT_CLOSED 0 > #define CONTEXT_USER_ENGINES 1 > > + /** > + * @uses_protected_content: context uses PXP-encrypted objects. > + * > + * This flag can only be set at ctx creation time and it's immutable for > + * the lifetime of the context. See I915_CONTEXT_PARAM_PROTECTED_CONTENT > + * in uapi/drm/i915_drm.h for more info on setting restrictions and > + * expected behaviour of marked contexts. > + */ > + bool uses_protected_content; > + > + /** > + * @pxp_wakeref: wakeref to keep the device awake when PXP is in use > + * > + * PXP sessions are invalidated when the device is suspended, which in > + * turns invalidates all contexts and objects using it. To keep the > + * flow simple, we keep the device awake when contexts using PXP objects > + * are in use. It is expected that the userspace application only uses > + * PXP when the display is on, so taking a wakeref here shouldn't worsen > + * our power metrics. > + */ > + intel_wakeref_t pxp_wakeref; > + > /** @mutex: guards everything that isn't engines or handles_vma */ > struct mutex mutex; > > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_create.c b/drivers/gpu/drm/i915/gem/i915_gem_create.c > index 1d341b8c47c0..8955d6abcef1 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_create.c > +++ b/drivers/gpu/drm/i915/gem/i915_gem_create.c > @@ -6,6 +6,7 @@ > #include "gem/i915_gem_ioctls.h" > #include "gem/i915_gem_lmem.h" > #include "gem/i915_gem_region.h" > +#include "pxp/intel_pxp.h" > > #include "i915_drv.h" > #include "i915_trace.h" > @@ -82,21 +83,11 @@ static int i915_gem_publish(struct drm_i915_gem_object *obj, > return 0; > } > > -/** > - * Creates a new object using the same path as DRM_I915_GEM_CREATE_EXT > - * @i915: i915 private > - * @size: size of the buffer, in bytes > - * @placements: possible placement regions, in priority order > - * @n_placements: number of possible placement regions > - * > - * This function is exposed primarily for selftests and does very little > - * error checking. It is assumed that the set of placement regions has > - * already been verified to be valid. > - */ > -struct drm_i915_gem_object * > -__i915_gem_object_create_user(struct drm_i915_private *i915, u64 size, > - struct intel_memory_region **placements, > - unsigned int n_placements) > +static struct drm_i915_gem_object * > +__i915_gem_object_create_user_ext(struct drm_i915_private *i915, u64 size, > + struct intel_memory_region **placements, > + unsigned int n_placements, > + unsigned int ext_flags) > { > struct intel_memory_region *mr = placements[0]; > struct drm_i915_gem_object *obj; > @@ -135,6 +126,9 @@ __i915_gem_object_create_user(struct drm_i915_private *i915, u64 size, > > GEM_BUG_ON(size != obj->base.size); > > + /* Add any flag set by create_ext options */ > + obj->flags |= ext_flags; > + > trace_i915_gem_object_create(obj); > return obj; > > @@ -145,6 +139,26 @@ __i915_gem_object_create_user(struct drm_i915_private *i915, u64 size, > return ERR_PTR(ret); > } > > +/** > + * Creates a new object using the same path as DRM_I915_GEM_CREATE_EXT > + * @i915: i915 private > + * @size: size of the buffer, in bytes > + * @placements: possible placement regions, in priority order > + * @n_placements: number of possible placement regions > + * > + * This function is exposed primarily for selftests and does very little > + * error checking. It is assumed that the set of placement regions has > + * already been verified to be valid. > + */ > +struct drm_i915_gem_object * > +__i915_gem_object_create_user(struct drm_i915_private *i915, u64 size, > + struct intel_memory_region **placements, > + unsigned int n_placements) > +{ > + return __i915_gem_object_create_user_ext(i915, size, placements, > + n_placements, 0); > +} > + > int > i915_gem_dumb_create(struct drm_file *file, > struct drm_device *dev, > @@ -224,6 +238,7 @@ struct create_ext { > struct drm_i915_private *i915; > struct intel_memory_region *placements[INTEL_REGION_UNKNOWN]; > unsigned int n_placements; > + unsigned long flags; > }; > > static void repr_placements(char *buf, size_t size, > @@ -353,8 +368,28 @@ static int ext_set_placements(struct i915_user_extension __user *base, > return set_placements(&ext, data); > } > > +static int ext_set_protected(struct i915_user_extension __user *base, void *data) > +{ > + struct drm_i915_gem_create_ext_protected_content ext; > + struct create_ext *ext_data = data; > + > + if (copy_from_user(&ext, base, sizeof(ext))) > + return -EFAULT; > + > + if (ext.flags) > + return -EINVAL; > + > + if (!intel_pxp_is_enabled(&ext_data->i915->gt.pxp)) > + return -ENODEV; > + > + ext_data->flags |= I915_BO_PROTECTED; > + > + return 0; > +} > + > static const i915_user_extension_fn create_extensions[] = { > [I915_GEM_CREATE_EXT_MEMORY_REGIONS] = ext_set_placements, > + [I915_GEM_CREATE_EXT_PROTECTED_CONTENT] = ext_set_protected, > }; > > /** > @@ -389,9 +424,10 @@ i915_gem_create_ext_ioctl(struct drm_device *dev, void *data, > ext_data.n_placements = 1; > } > > - obj = __i915_gem_object_create_user(i915, args->size, > - ext_data.placements, > - ext_data.n_placements); > + obj = __i915_gem_object_create_user_ext(i915, args->size, > + ext_data.placements, > + ext_data.n_placements, > + ext_data.flags); > if (IS_ERR(obj)) > return PTR_ERR(obj); > > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c > index 8290bdadd167..bd17741f462f 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c > +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c > @@ -21,6 +21,8 @@ > #include "gt/intel_gt_pm.h" > #include "gt/intel_ring.h" > > +#include "pxp/intel_pxp.h" > + > #include "i915_drv.h" > #include "i915_gem_clflush.h" > #include "i915_gem_context.h" > @@ -825,6 +827,22 @@ static struct i915_vma *eb_lookup_vma(struct i915_execbuffer *eb, u32 handle) > if (unlikely(!obj)) > return ERR_PTR(-ENOENT); > > + /* > + * If the user has opted-in for protected-object tracking, make > + * sure the object encryption can be used. > + * We only need to do this when the object is first used with > + * this context, because the context itself will be banned when > + * the protected objects become invalid. > + */ > + if (i915_gem_context_uses_protected_content(eb->gem_context) && > + i915_gem_object_is_protected(obj)) { > + err = intel_pxp_key_check(&vm->gt->pxp, obj); > + if (err) { > + i915_gem_object_put(obj); > + return ERR_PTR(err); > + } > + } > + > vma = i915_vma_instance(obj, vm, NULL); > if (IS_ERR(vma)) { > i915_gem_object_put(obj); > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.c b/drivers/gpu/drm/i915/gem/i915_gem_object.c > index 6fb9afb65034..e85f2d9fddee 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_object.c > +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.c > @@ -25,6 +25,7 @@ > #include > > #include "display/intel_frontbuffer.h" > +#include "pxp/intel_pxp.h" > #include "i915_drv.h" > #include "i915_gem_clflush.h" > #include "i915_gem_context.h" > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h > index 48112b9d76df..ed171daf49a7 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_object.h > +++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h > @@ -269,6 +269,12 @@ i915_gem_object_clear_tiling_quirk(struct drm_i915_gem_object *obj) > clear_bit(I915_TILING_QUIRK_BIT, &obj->flags); > } > > +static inline bool > +i915_gem_object_is_protected(const struct drm_i915_gem_object *obj) > +{ > + return obj->flags & I915_BO_PROTECTED; > +} > + > static inline bool > i915_gem_object_type_has(const struct drm_i915_gem_object *obj, > unsigned long 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 2471f36aaff3..7d7e9c77f199 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_object_types.h > +++ b/drivers/gpu/drm/i915/gem/i915_gem_object_types.h > @@ -298,6 +298,7 @@ struct drm_i915_gem_object { > I915_BO_ALLOC_USER) > #define I915_BO_READONLY BIT(4) > #define I915_TILING_QUIRK_BIT 5 /* unknown swizzling; do not release! */ > +#define I915_BO_PROTECTED BIT(6) > > /** > * @mem_flags - Mutable placement-related flags > @@ -537,6 +538,13 @@ struct drm_i915_gem_object { > bool created:1; > } ttm; > > + /* > + * Record which PXP key instance this object was created against (if > + * any), so we can use it to determine if the encryption is valid by > + * comparing against the current key instance. > + */ > + u32 pxp_key_instance; > + > /** Record of address bit 17 of each page at last unbind. */ > unsigned long *bit_17; > > diff --git a/drivers/gpu/drm/i915/gem/selftests/mock_context.c b/drivers/gpu/drm/i915/gem/selftests/mock_context.c > index fee070df1c97..753a2c9248f5 100644 > --- a/drivers/gpu/drm/i915/gem/selftests/mock_context.c > +++ b/drivers/gpu/drm/i915/gem/selftests/mock_context.c > @@ -87,7 +87,7 @@ live_context(struct drm_i915_private *i915, struct file *file) > return ERR_CAST(pc); > > ctx = i915_gem_create_context(i915, pc); > - proto_context_close(pc); > + proto_context_close(i915, pc); > if (IS_ERR(ctx)) > return ctx; > > @@ -162,7 +162,7 @@ kernel_context(struct drm_i915_private *i915, > } > > ctx = i915_gem_create_context(i915, pc); > - proto_context_close(pc); > + proto_context_close(i915, pc); > if (IS_ERR(ctx)) > return ctx; > > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.c b/drivers/gpu/drm/i915/pxp/intel_pxp.c > index b0c7edc10cc3..9beac9746c00 100644 > --- a/drivers/gpu/drm/i915/pxp/intel_pxp.c > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.c > @@ -7,6 +7,7 @@ > #include "intel_pxp_irq.h" > #include "intel_pxp_session.h" > #include "intel_pxp_tee.h" > +#include "gem/i915_gem_context.h" > #include "gt/intel_context.h" > #include "i915_drv.h" > > @@ -166,3 +167,85 @@ void intel_pxp_fini_hw(struct intel_pxp *pxp) > > intel_pxp_irq_disable(pxp); > } > + > +int intel_pxp_key_check(struct intel_pxp *pxp, struct drm_i915_gem_object *obj) > +{ > + if (!intel_pxp_is_active(pxp)) > + return -ENODEV; > + > + if (!i915_gem_object_is_protected(obj)) > + return -EINVAL; > + > + GEM_BUG_ON(!pxp->key_instance); > + > + /* > + * If this is the first time we're using this object, it's not > + * encrypted yet; it will be encrypted with the current key, so mark it > + * as such. If the object is already encrypted, check instead if the > + * used key is still valid. > + */ > + if (!obj->pxp_key_instance) > + obj->pxp_key_instance = pxp->key_instance; > + else if (obj->pxp_key_instance != pxp->key_instance) > + return -ENOEXEC; > + > + return 0; > +} > + > +void intel_pxp_invalidate(struct intel_pxp *pxp) > +{ > + struct drm_i915_private *i915 = pxp_to_gt(pxp)->i915; > + struct i915_gem_context *ctx, *cn; > + > + /* ban all contexts marked as protected */ > + spin_lock_irq(&i915->gem.contexts.lock); > + list_for_each_entry_safe(ctx, cn, &i915->gem.contexts.list, link) { > + struct i915_gem_engines_iter it; > + struct intel_context *ce; > + > + if (!kref_get_unless_zero(&ctx->ref)) > + continue; > + > + if (likely(!i915_gem_context_uses_protected_content(ctx))) { > + i915_gem_context_put(ctx); > + continue; > + } > + > + spin_unlock_irq(&i915->gem.contexts.lock); > + > + /* > + * By the time we get here, the HW keys are already long gone, > + * so any batch using them that's already on the engines is very > + * likely a lost cause (and it has probably already hung the > + * engine). Therefore, we skip attempting to pull the running > + * context out of the HW and we prioritize bringing the session > + * back as soon as possible. > + * For each context we ban we increase the ctx->guilty_count, so > + * that userspace can see that all the intel contexts have been > + * banned (on a non-recoverable gem context, guilty intel > + * contexts are banned immediately on reset, so we report the > + * same way here). hmm... but guilty specifically means that they indeed caused the GPU hang. does the umd really need this indication? any other way of doing this? > + */ > + for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) > + if (!intel_context_ban(ce, NULL)) > + atomic_inc(&ctx->guilty_count); > + i915_gem_context_unlock_engines(ctx); > + > + /* > + * The context has been killed, no need to keep the wakeref. > + * This is safe from races because the only other place this > + * is touched is context_close and we're holding a ctx ref > + */ The comments make sense, but maybe we should avoid the optimization here, but maybe we should avoid the optimization and just keep it locked? > + if (ctx->pxp_wakeref) { > + intel_runtime_pm_put(&i915->runtime_pm, > + ctx->pxp_wakeref); > + ctx->pxp_wakeref = 0; > + } > + > + spin_lock_irq(&i915->gem.contexts.lock); > + list_safe_reset_next(ctx, cn, link); > + i915_gem_context_put(ctx); > + } > + spin_unlock_irq(&i915->gem.contexts.lock); > +} > + > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp.h b/drivers/gpu/drm/i915/pxp/intel_pxp.h > index 8f1e86caa53f..f942bdd2af0c 100644 > --- a/drivers/gpu/drm/i915/pxp/intel_pxp.h > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp.h > @@ -9,6 +9,8 @@ > #include "gt/intel_gt_types.h" > #include "intel_pxp_types.h" > > +struct drm_i915_gem_object; > + > static inline struct intel_gt *pxp_to_gt(const struct intel_pxp *pxp) > { > return container_of(pxp, struct intel_gt, pxp); > @@ -33,6 +35,10 @@ void intel_pxp_fini_hw(struct intel_pxp *pxp); > > void intel_pxp_mark_termination_in_progress(struct intel_pxp *pxp); > int intel_pxp_wait_for_arb_start(struct intel_pxp *pxp); > + > +int intel_pxp_key_check(struct intel_pxp *pxp, struct drm_i915_gem_object *obj); > + > +void intel_pxp_invalidate(struct intel_pxp *pxp); > #else > static inline void intel_pxp_init(struct intel_pxp *pxp) > { > @@ -46,6 +52,12 @@ static inline int intel_pxp_wait_for_arb_start(struct intel_pxp *pxp) > { > return -ENODEV; > } > + > +static inline int intel_pxp_key_check(struct intel_pxp *pxp, > + struct drm_i915_gem_object *obj) > +{ > + return -ENODEV; > +} > #endif > > #endif /* __INTEL_PXP_H__ */ > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c > index 67c30e534d50..c6a5e4197e40 100644 > --- a/drivers/gpu/drm/i915/pxp/intel_pxp_session.c > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_session.c > @@ -72,6 +72,9 @@ static int pxp_create_arb_session(struct intel_pxp *pxp) > return ret; > } > > + if (!++pxp->key_instance) > + ++pxp->key_instance; > + > pxp->arb_is_valid = true; > > return 0; > @@ -85,6 +88,9 @@ static int pxp_terminate_arb_session_and_global(struct intel_pxp *pxp) > /* must mark termination in progress calling this function */ > GEM_WARN_ON(pxp->arb_is_valid); > > + /* invalidate protected objects */ > + intel_pxp_invalidate(pxp); > + > /* terminate the hw sessions */ > ret = intel_pxp_terminate_session(pxp, ARB_SESSION); > if (ret) { > diff --git a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h > index 5a170e43c959..c394ab2e452b 100644 > --- a/drivers/gpu/drm/i915/pxp/intel_pxp_types.h > +++ b/drivers/gpu/drm/i915/pxp/intel_pxp_types.h > @@ -7,7 +7,9 @@ > #define __INTEL_PXP_TYPES_H__ > > #include > +#include > #include > +#include > #include > #include > > @@ -27,6 +29,13 @@ struct intel_pxp { > */ > bool arb_is_valid; > > + /* > + * Keep track of which key instance we're on, so we can use it to > + * determine if an object was created using the current key or a > + * previous one. > + */ > + u32 key_instance; > + > struct mutex tee_mutex; /* protects the tee channel binding */ > > /* > diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h > index 920e9e852e5a..9ff77732428b 100644 > --- a/include/uapi/drm/i915_drm.h > +++ b/include/uapi/drm/i915_drm.h > @@ -1846,12 +1846,36 @@ struct drm_i915_gem_context_param { > * attempted to use it, never re-use this context param number. > */ > #define I915_CONTEXT_PARAM_RINGSIZE 0xc > + > +/* > + * I915_CONTEXT_PARAM_PROTECTED_CONTENT: > + * > + * Mark that the context makes use of protected content, which will result > + * in the context being invalidated when the protected content session is. The > + * invalidation is reported back to userspace by banning all the engine contexts > + * within the gem context and increasing the guilty_count to match; this will > + * be reported in the RESET_STATS ioctl the same way as if the bans were due to > + * hangs. Given that the protected content session is killed on suspend, the > + * device is kept awake for the lifetime of a protected context, so the user > + * should make sure to dispose of them once done. > + * This flag can only be set at context creation time and, when set to true, > + * must be preceded by an explicit setting of I915_CONTEXT_PARAM_RECOVERABLE > + * to false. This flag can't be set to true in conjunction with setting the > + * I915_CONTEXT_PARAM_BANNABLE flag to false. > + * > + * In addition to the normal failure cases, setting this flag during context > + * creation can result in the following errors: > + * > + * -ENODEV: feature not available > + * -EPERM: trying to mark a recoverable or not bannable context as protected > + */ > +#define I915_CONTEXT_PARAM_PROTECTED_CONTENT 0xd > /* Must be kept compact -- no holes and well documented */ > > __u64 value; > }; > > -/* > +/** > * Context SSEU programming > * > * It may be necessary for either functional or performance reason to configure > @@ -2979,8 +3003,12 @@ struct drm_i915_gem_create_ext { > * > * For I915_GEM_CREATE_EXT_MEMORY_REGIONS usage see > * struct drm_i915_gem_create_ext_memory_regions. > + * > + * For I915_GEM_CREATE_EXT_PROTECTED_CONTENT usage see > + * struct drm_i915_gem_create_ext_protected_content. > */ > #define I915_GEM_CREATE_EXT_MEMORY_REGIONS 0 > +#define I915_GEM_CREATE_EXT_PROTECTED_CONTENT 1 > __u64 extensions; > }; > > @@ -3038,6 +3066,31 @@ struct drm_i915_gem_create_ext_memory_regions { > __u64 regions; > }; > > +/** > + * struct drm_i915_gem_create_ext_protected_content - The > + * I915_OBJECT_PARAM_PROTECTED_CONTENT extension. > + * > + * If this extension is provided, buffer contents are expected to be protected > + * by PXP encryption and require decryption for scan out and processing. This > + * is only possible on platforms that have PXP enabled, on all other scenarios > + * using this extension will cause the ioctl to fail and return -ENODEV. The > + * flags parameter is reserved for future expansion and must currently be set > + * to zero. > + * > + * The buffer contents are considered invalid after a PXP session teardown. > + * > + * The encryption is guaranteed to be processed correctly only if the object > + * is submitted with a context created using the > + * I915_CONTEXT_PARAM_PROTECTED_CONTENT flag. This will also enable extra checks > + * at submission time on the validity of the objects involved. > + */ > +struct drm_i915_gem_create_ext_protected_content { > + /** @base: Extension link. See struct i915_user_extension. */ > + struct i915_user_extension base; > + /** @flags: reserved for future usage, currently MBZ */ > + __u32 flags; > +}; > + > /* ID of the protected content session managed by i915 when PXP is active */ > #define I915_PROTECTED_CONTENT_DEFAULT_SESSION 0xf > > -- > 2.25.1 >