[Intel-gfx] [PATCH v9 36/70] drm/i915: Lock ww in ucode objects correctly

From: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>,
	dri-devel@lists.freedesktop.org
Subject: [Intel-gfx] [PATCH v9 36/70] drm/i915: Lock ww in ucode objects correctly
Date: Tue, 23 Mar 2021 16:50:25 +0100	[thread overview]
Message-ID: <20210323155059.628690-37-maarten.lankhorst@linux.intel.com> (raw)
In-Reply-To: <20210323155059.628690-1-maarten.lankhorst@linux.intel.com>

In the ucode functions, the calls are done before userspace runs,
when debugging using debugfs, or when creating semi-permanent mappings;
we can safely use the unlocked versions that does the ww dance for us.

Because there is no pin_pages_unlocked yet, add it as convenience function.

This removes possible lockdep splats about missing resv lock for ucode.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/gpu/drm/i915/gem/i915_gem_object.h |  2 ++
 drivers/gpu/drm/i915/gem/i915_gem_pages.c  | 20 ++++++++++++++++++++
 drivers/gpu/drm/i915/gt/uc/intel_guc.c     |  2 +-
 drivers/gpu/drm/i915/gt/uc/intel_guc_log.c |  4 ++--
 drivers/gpu/drm/i915/gt/uc/intel_huc.c     |  2 +-
 drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c   |  2 +-
 6 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_object.h b/drivers/gpu/drm/i915/gem/i915_gem_object.h
index 74de195b57de..5fffa6f07560 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_object.h
@@ -392,6 +392,8 @@ i915_gem_object_pin_pages(struct drm_i915_gem_object *obj)
 	return __i915_gem_object_get_pages(obj);
 }
 
+int i915_gem_object_pin_pages_unlocked(struct drm_i915_gem_object *obj);
+
 static inline bool
 i915_gem_object_has_pages(struct drm_i915_gem_object *obj)
 {
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 2d0065fa6e80..5b8af8f83ee3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -139,6 +139,26 @@ int __i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
 	return err;
 }
 
+int i915_gem_object_pin_pages_unlocked(struct drm_i915_gem_object *obj)
+{
+	struct i915_gem_ww_ctx ww;
+	int err;
+
+	i915_gem_ww_ctx_init(&ww, true);
+retry:
+	err = i915_gem_object_lock(obj, &ww);
+	if (!err)
+		err = i915_gem_object_pin_pages(obj);
+
+	if (err == -EDEADLK) {
+		err = i915_gem_ww_ctx_backoff(&ww);
+		if (!err)
+			goto retry;
+	}
+	i915_gem_ww_ctx_fini(&ww);
+	return err;
+}
+
 /* Immediately discard the backing storage */
 void i915_gem_object_truncate(struct drm_i915_gem_object *obj)
 {
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index 4545e90e3bf1..78305b2ec89d 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -682,7 +682,7 @@ int intel_guc_allocate_and_map_vma(struct intel_guc *guc, u32 size,
 	if (IS_ERR(vma))
 		return PTR_ERR(vma);
 
-	vaddr = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
+	vaddr = i915_gem_object_pin_map_unlocked(vma->obj, I915_MAP_WB);
 	if (IS_ERR(vaddr)) {
 		i915_vma_unpin_and_release(&vma, 0);
 		return PTR_ERR(vaddr);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
index c92f2c056db4..c36d5eb5bbb9 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
@@ -335,7 +335,7 @@ static int guc_log_map(struct intel_guc_log *log)
 	 * buffer pages, so that we can directly get the data
 	 * (up-to-date) from memory.
 	 */
-	vaddr = i915_gem_object_pin_map(log->vma->obj, I915_MAP_WC);
+	vaddr = i915_gem_object_pin_map_unlocked(log->vma->obj, I915_MAP_WC);
 	if (IS_ERR(vaddr))
 		return PTR_ERR(vaddr);
 
@@ -744,7 +744,7 @@ int intel_guc_log_dump(struct intel_guc_log *log, struct drm_printer *p,
 	if (!obj)
 		return 0;
 
-	map = i915_gem_object_pin_map(obj, I915_MAP_WC);
+	map = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WC);
 	if (IS_ERR(map)) {
 		DRM_DEBUG("Failed to pin object\n");
 		drm_puts(p, "(log data unaccessible)\n");
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_huc.c b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
index 65eeb44b397d..2126dd81ac38 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_huc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_huc.c
@@ -82,7 +82,7 @@ static int intel_huc_rsa_data_create(struct intel_huc *huc)
 	if (IS_ERR(vma))
 		return PTR_ERR(vma);
 
-	vaddr = i915_gem_object_pin_map(vma->obj, I915_MAP_WB);
+	vaddr = i915_gem_object_pin_map_unlocked(vma->obj, I915_MAP_WB);
 	if (IS_ERR(vaddr)) {
 		i915_vma_unpin_and_release(&vma, 0);
 		return PTR_ERR(vaddr);
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
index 984fa79e0fa7..df647c9a8d56 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_uc_fw.c
@@ -539,7 +539,7 @@ int intel_uc_fw_init(struct intel_uc_fw *uc_fw)
 	if (!intel_uc_fw_is_available(uc_fw))
 		return -ENOEXEC;
 
-	err = i915_gem_object_pin_pages(uc_fw->obj);
+	err = i915_gem_object_pin_pages_unlocked(uc_fw->obj);
 	if (err) {
 		DRM_DEBUG_DRIVER("%s fw pin-pages err=%d\n",
 				 intel_uc_fw_type_repr(uc_fw->type), err);
-- 
2.31.0

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