From e1068a9e808a14cd532ede325e5e16df45c63f18 Mon Sep 17 00:00:00 2001 From: Daniel Vetter Date: Thu, 2 Sep 2021 16:20:50 +0200 Subject: [PATCH] drm/i915: Drop code to handle set-vm races from execbuf MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Changing the vm from a finalized gem ctx is no longer possible, which means we don't have to check for that anymore. I was pondering whether to keep the check as a WARN_ON, but things go boom real bad real fast if the vm of a vma is wrong. Plus we'd need to also get the ggtt vm for !full-ppgtt platforms. Ditching it all seemed like a better idea. Reviewed-by: Maarten Lankhorst References: ccbc1b97948a ("drm/i915/gem: Don't allow changing the VM on running contexts (v4)") Signed-off-by: Daniel Vetter Cc: Jon Bloomfield Cc: Chris Wilson Cc: Maarten Lankhorst Cc: Joonas Lahtinen Cc: Daniel Vetter Cc: "Thomas Hellström" Cc: Matthew Auld Cc: Lionel Landwerlin Cc: Dave Airlie Cc: Jason Ekstrand Link: https://patchwork.freedesktop.org/patch/msgid/20210902142057.929669-4-daniel.vetter@ffwll.ch --- drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c index 45bc4e4ff048..4816359c4c21 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c @@ -759,11 +759,7 @@ static int __eb_add_lut(struct i915_execbuffer *eb, /* Check that the context hasn't been closed in the meantime */ err = -EINTR; if (!mutex_lock_interruptible(&ctx->lut_mutex)) { - struct i915_address_space *vm = rcu_access_pointer(ctx->vm); - - if (unlikely(vm && vma->vm != vm)) - err = -EAGAIN; /* user racing with ctx set-vm */ - else if (likely(!i915_gem_context_is_closed(ctx))) + if (likely(!i915_gem_context_is_closed(ctx))) err = radix_tree_insert(&ctx->handles_vma, handle, vma); else err = -ENOENT;