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drm/i915/uapi: expose the avail tracking

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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@i915_query@query-regions-unallocated
Testcase: igt@i915_query@query-regions-sanity-check
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Kenneth Graunke <kenneth@whitecape.org>
Cc: Akeem G Abodunrin <akeem.g.abodunrin@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220629174350.384910-3-matthew.auld@intel.com
This commit is contained in:
Matthew Auld 2022-06-29 18:43:40 +01:00
parent 3f4309cbdc
commit 141f733bb3
6 changed files with 82 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/gpu/drm/i915/i915_query.c
View File

@ -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;

29
drivers/gpu/drm/i915/i915_ttm_buddy_manager.c
View File

@ -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);
}
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)

3
drivers/gpu/drm/i915/i915_ttm_buddy_manager.h
View File

@ -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);

14
drivers/gpu/drm/i915/intel_memory_region.c
View File

@ -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;

3
drivers/gpu/drm/i915/intel_memory_region.h
View File

@ -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);

31
include/uapi/drm/i915_drm.h
View File

@ -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;
};
};
};