[Intel-gfx] [PATCH v3 03/13] drm/i915/uapi: expose the avail tracking
Matthew Auld
matthew.auld at intel.com
Wed Jun 29 12:14:17 UTC 2022
Vulkan would like to have a rough measure of how much device memory can
in theory be allocated. Also add unallocated_cpu_visible_size to track
the visible portion, in case the device is using small BAR. Also tweak
the locking so we nice consistent values for both the mm->avail and the
visible tracking.
v2: tweak the locking slightly so we update the mm->avail and visible
tracking as one atomic operation, such that userspace doesn't get
strange values when sampling the values.
Testcase: igt at i915_query@query-regions-unallocated
Testcase: igt at i915_query@query-regions-sanity-check
Signed-off-by: Matthew Auld <matthew.auld at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
Cc: Jon Bloomfield <jon.bloomfield at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Jordan Justen <jordan.l.justen at intel.com>
Cc: Kenneth Graunke <kenneth at whitecape.org>
Cc: Akeem G Abodunrin <akeem.g.abodunrin at intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom at linux.intel.com>
---
drivers/gpu/drm/i915/i915_query.c | 10 +++++-
drivers/gpu/drm/i915/i915_ttm_buddy_manager.c | 31 ++++++++++++++-----
drivers/gpu/drm/i915/i915_ttm_buddy_manager.h | 3 ++
drivers/gpu/drm/i915/intel_memory_region.c | 14 +++++++++
drivers/gpu/drm/i915/intel_memory_region.h | 3 ++
include/uapi/drm/i915_drm.h | 31 ++++++++++++++++++-
6 files changed, 82 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index 9894add651dd..6ec9c9fb7b0d 100644
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -504,7 +504,15 @@ static int query_memregion_info(struct drm_i915_private *i915,
else
info.probed_cpu_visible_size = mr->total;
- info.unallocated_size = mr->avail;
+ if (perfmon_capable()) {
+ intel_memory_region_avail(mr,
+ &info.unallocated_size,
+ &info.unallocated_cpu_visible_size);
+ } else {
+ info.unallocated_size = info.probed_size;
+ info.unallocated_cpu_visible_size =
+ info.probed_cpu_visible_size;
+ }
if (__copy_to_user(info_ptr, &info, sizeof(info)))
return -EFAULT;
diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
index a5109548abc0..427de1aaab36 100644
--- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
+++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
@@ -104,18 +104,15 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
min_page_size,
&bman_res->blocks,
bman_res->flags);
- mutex_unlock(&bman->lock);
if (unlikely(err))
goto err_free_blocks;
if (place->flags & TTM_PL_FLAG_CONTIGUOUS) {
u64 original_size = (u64)bman_res->base.num_pages << PAGE_SHIFT;
- mutex_lock(&bman->lock);
drm_buddy_block_trim(mm,
original_size,
&bman_res->blocks);
- mutex_unlock(&bman->lock);
}
if (lpfn <= bman->visible_size) {
@@ -137,11 +134,10 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
}
}
- if (bman_res->used_visible_size) {
- mutex_lock(&bman->lock);
+ if (bman_res->used_visible_size)
bman->visible_avail -= bman_res->used_visible_size;
- mutex_unlock(&bman->lock);
- }
+
+ mutex_unlock(&bman->lock);
if (place->lpfn - place->fpfn == n_pages)
bman_res->base.start = place->fpfn;
@@ -154,7 +150,6 @@ static int i915_ttm_buddy_man_alloc(struct ttm_resource_manager *man,
return 0;
err_free_blocks:
- mutex_lock(&bman->lock);
drm_buddy_free_list(mm, &bman_res->blocks);
mutex_unlock(&bman->lock);
err_free_res:
@@ -365,6 +360,26 @@ u64 i915_ttm_buddy_man_visible_size(struct ttm_resource_manager *man)
return bman->visible_size;
}
+/**
+ * i915_ttm_buddy_man_avail - Query the avail tracking for the manager.
+ *
+ * @man: The buddy allocator ttm manager
+ * @avail: The total available memory in pages for the entire manager.
+ * @visible_avail: The total available memory in pages for the CPU visible
+ * portion. Note that this will always give the same value as @avail on
+ * configurations that don't have a small BAR.
+ */
+void i915_ttm_buddy_man_avail(struct ttm_resource_manager *man,
+ u64 *avail, u64 *visible_avail)
+{
+ struct i915_ttm_buddy_manager *bman = to_buddy_manager(man);
+
+ mutex_lock(&bman->lock);
+ *avail = bman->mm.avail >> PAGE_SHIFT;
+ *visible_avail = bman->visible_avail;
+ mutex_unlock(&bman->lock);
+}
+
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
void i915_ttm_buddy_man_force_visible_size(struct ttm_resource_manager *man,
u64 size)
diff --git a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
index 52d9586d242c..d64620712830 100644
--- a/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
+++ b/drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
@@ -61,6 +61,9 @@ int i915_ttm_buddy_man_reserve(struct ttm_resource_manager *man,
u64 i915_ttm_buddy_man_visible_size(struct ttm_resource_manager *man);
+void i915_ttm_buddy_man_avail(struct ttm_resource_manager *man,
+ u64 *avail, u64 *avail_visible);
+
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
void i915_ttm_buddy_man_force_visible_size(struct ttm_resource_manager *man,
u64 size);
diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c
index e38d2db1c3e3..94ee26e99549 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/intel_memory_region.c
@@ -279,6 +279,20 @@ void intel_memory_region_set_name(struct intel_memory_region *mem,
va_end(ap);
}
+void intel_memory_region_avail(struct intel_memory_region *mr,
+ u64 *avail, u64 *visible_avail)
+{
+ if (mr->type == INTEL_MEMORY_LOCAL) {
+ i915_ttm_buddy_man_avail(mr->region_private,
+ avail, visible_avail);
+ *avail <<= PAGE_SHIFT;
+ *visible_avail <<= PAGE_SHIFT;
+ } else {
+ *avail = mr->total;
+ *visible_avail = mr->total;
+ }
+}
+
void intel_memory_region_destroy(struct intel_memory_region *mem)
{
int ret = 0;
diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h
index 3d8378c1b447..2214f251bec3 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.h
+++ b/drivers/gpu/drm/i915/intel_memory_region.h
@@ -127,6 +127,9 @@ int intel_memory_region_reserve(struct intel_memory_region *mem,
void intel_memory_region_debug(struct intel_memory_region *mr,
struct drm_printer *printer);
+void intel_memory_region_avail(struct intel_memory_region *mr,
+ u64 *avail, u64 *visible_avail);
+
struct intel_memory_region *
i915_gem_ttm_system_setup(struct drm_i915_private *i915,
u16 type, u16 instance);
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 7eacacb00373..e4847436bab8 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -3228,7 +3228,15 @@ struct drm_i915_memory_region_info {
*/
__u64 probed_size;
- /** @unallocated_size: Estimate of memory remaining */
+ /**
+ * @unallocated_size: Estimate of memory remaining
+ *
+ * Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable accounting.
+ * Without this (or if this is an older kernel) the value here will
+ * always equal the @probed_size. Note this is only currently tracked
+ * for I915_MEMORY_CLASS_DEVICE regions (for other types the value here
+ * will always equal the @probed_size).
+ */
__u64 unallocated_size;
union {
@@ -3262,6 +3270,27 @@ struct drm_i915_memory_region_info {
* @probed_size.
*/
__u64 probed_cpu_visible_size;
+
+ /**
+ * @unallocated_cpu_visible_size: Estimate of CPU
+ * visible memory remaining.
+ *
+ * Note this is only tracked for
+ * I915_MEMORY_CLASS_DEVICE regions (for other types the
+ * value here will always equal the
+ * @probed_cpu_visible_size).
+ *
+ * Requires CAP_PERFMON or CAP_SYS_ADMIN to get reliable
+ * accounting. Without this the value here will always
+ * equal the @probed_cpu_visible_size. Note this is only
+ * currently tracked for I915_MEMORY_CLASS_DEVICE
+ * regions (for other types the value here will also
+ * always equal the @probed_cpu_visible_size).
+ *
+ * If this is an older kernel the value here will be
+ * zero, see also @probed_cpu_visible_size.
+ */
+ __u64 unallocated_cpu_visible_size;
};
};
};
--
2.36.1
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