[Intel-gfx] [PATCH 07/11] drm/i915: Add i915_gem_context_is_full_ppgtt

Daniel Vetter
2021-08-13T20:31:10Z

And use it anywhere we have open-coded checks for ctx->vm that really
only check for full ppgtt.

Plus for paranoia add a GEM_BUG_ON that checks it's really only set
when we have full ppgtt, just in case. gem_context->vm is different
since it's NULL in ggtt mode, unlike intel_context->vm or gt->vm,
which is always set.

v2: 0day found a testcase that I missed.

Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jason Ekstrand <jason@jlekstrand.net>
---
drivers/gpu/drm/i915/gem/i915_gem_context.c | 2 +-
drivers/gpu/drm/i915/gem/i915_gem_context.h | 7 +++++++
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 2 +-
drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c | 6 +++---
4 files changed, 12 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 7a566fb7cca4..1eec85944c1f 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -1566,7 +1566,7 @@ static int get_ppgtt(struct drm_i915_file_private *file_priv,
int err;
u32 id;

- if (!rcu_access_pointer(ctx->vm))
+ if (!i915_gem_context_is_full_ppgtt(ctx))
return -ENODEV;

rcu_read_lock();
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.h b/drivers/gpu/drm/i915/gem/i915_gem_context.h
index da6e8b506d96..37536a260e6e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.h
@@ -154,6 +154,13 @@ i915_gem_context_vm(struct i915_gem_context *ctx)
return rcu_dereference_protected(ctx->vm, lockdep_is_held(&ctx->mutex));
}

+static inline bool i915_gem_context_is_full_ppgtt(struct i915_gem_context *ctx)
+{
+ GEM_BUG_ON(!!rcu_access_pointer(ctx->vm) != HAS_FULL_PPGTT(ctx->i915));
+
+ return !!rcu_access_pointer(ctx->vm);
+}
+
static inline struct i915_address_space *
i915_gem_context_get_eb_vm(struct i915_gem_context *ctx)
{
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 905b1cbd22d5..40f08948f0b2 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -749,7 +749,7 @@ static int eb_select_context(struct i915_execbuffer *eb)
return PTR_ERR(ctx);

eb->gem_context = ctx;
- if (rcu_access_pointer(ctx->vm))
+ if (i915_gem_context_is_full_ppgtt(ctx))
eb->invalid_flags |= EXEC_OBJECT_NEEDS_GTT;

return 0;
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index d436ce7fa25c..0708b9cdeb9f 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -704,7 +704,7 @@ static int igt_ctx_exec(void *arg)
pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) [full-ppgtt? %s], err=%d\n",
ndwords, dw, max_dwords(obj),
engine->name,
- yesno(!!rcu_access_pointer(ctx->vm)),
+ yesno(i915_gem_context_is_full_ppgtt(ctx)),
err);
intel_context_put(ce);
kernel_context_close(ctx);
@@ -838,7 +838,7 @@ static int igt_shared_ctx_exec(void *arg)
pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) [full-ppgtt? %s], err=%d\n",
ndwords, dw, max_dwords(obj),
engine->name,
- yesno(!!rcu_access_pointer(ctx->vm)),
+ yesno(i915_gem_context_is_full_ppgtt(ctx)),
err);
intel_context_put(ce);
kernel_context_close(ctx);
@@ -1417,7 +1417,7 @@ static int igt_ctx_readonly(void *arg)
pr_err("Failed to fill dword %lu [%lu/%lu] with gpu (%s) [full-ppgtt? %s], err=%d\n",
ndwords, dw, max_dwords(obj),
ce->engine->name,
- yesno(!!ctx_vm(ctx)),
+ yesno(i915_gem_context_is_full_ppgtt(ctx)),
err);
i915_gem_context_unlock_engines(ctx);
goto out_file;
--
2.32.0