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drm/xe/memirq: Reduce buffer size

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When using MSI-X, we don't have to allocate the largest possible
buffer to accommodate all potential engine instances. Loop through
available engines, find highest engine instance and reduce buffer
size to avoid memory waste.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Ilia Levi <ilia.levi@intel.com>
Reviewed-by: Ilia Levi <ilia.levi@intel.com>
Link: https://patch.msgid.link/20260518192547.600-6-michal.wajdeczko@intel.com
This commit is contained in:
Michal Wajdeczko 2026-05-18 21:25:43 +02:00
parent 37f1856e12
commit 86d08fe942
1 changed files with 19 additions and 2 deletions
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21
drivers/gpu/drm/xe/xe_memirq.c
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@ -172,18 +172,35 @@ static inline bool hw_reports_to_instance_zero(struct xe_memirq *memirq)
return xe_device_has_msix(memirq_to_xe(memirq));
}
static unsigned int hwe_max_count(struct xe_tile *tile)
{
unsigned int max_instance = 0;
unsigned int gtid, hweid;
struct xe_hw_engine *hwe;
struct xe_gt *gt;
for_each_gt_on_tile(gt, tile, gtid)
for_each_hw_engine(hwe, gt, hweid)
max_instance = max(max_instance, hwe->instance);
return max_instance + 1;
}
static int memirq_alloc_pages(struct xe_memirq *memirq)
{
struct xe_device *xe = memirq_to_xe(memirq);
struct xe_tile *tile = memirq_to_tile(memirq);
size_t bo_size = hw_reports_to_instance_zero(memirq) ?
XE_HW_ENGINE_MAX_INSTANCE * SZ_4K : SZ_4K;
unsigned int num_pages;
struct xe_bo *bo;
size_t bo_size;
int err;
BUILD_BUG_ON(!IS_ALIGNED(XE_MEMIRQ_SOURCE_OFFSET(0), SZ_64));
BUILD_BUG_ON(!IS_ALIGNED(XE_MEMIRQ_STATUS_OFFSET(0), SZ_4K));
num_pages = hw_reports_to_instance_zero(memirq) ? hwe_max_count(tile) : 1;
bo_size = num_pages * SZ_4K;
bo = xe_managed_bo_create_pin_map(xe, tile, bo_size,
XE_BO_FLAG_SYSTEM |
XE_BO_FLAG_GGTT |