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drm/xe/lrc: Add helper to capture context timestamp

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Add a helper to capture CTX_TIMESTAMP from the context image so it can
be used to calculate the runtime.

v2: Add kernel-doc to clarify expectation from caller

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
Reviewed-by: Francois Dugast <francois.dugast@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240517204310.88854-4-lucas.demarchi@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
This commit is contained in:
Umesh Nerlige Ramappa 2024-05-17 13:43:05 -07:00 committed by Lucas De Marchi
parent bd49e50d81
commit 9b090d5774
4 changed files with 30 additions and 0 deletions
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1
drivers/gpu/drm/xe/regs/xe_lrc_layout.h
View File

@ -11,6 +11,7 @@
#define CTX_RING_TAIL (0x06 + 1)
#define CTX_RING_START (0x08 + 1)
#define CTX_RING_CTL (0x0a + 1)
#define CTX_TIMESTAMP (0x22 + 1)
#define CTX_INDIRECT_RING_STATE (0x26 + 1)
#define CTX_PDP0_UDW (0x30 + 1)
#define CTX_PDP0_LDW (0x32 + 1)

12
drivers/gpu/drm/xe/xe_lrc.c
View File

@ -844,6 +844,7 @@ int xe_lrc_init(struct xe_lrc *lrc, struct xe_hw_engine *hwe,
lrc->tile = gt_to_tile(hwe->gt);
lrc->ring.size = ring_size;
lrc->ring.tail = 0;
lrc->ctx_timestamp = 0;
xe_hw_fence_ctx_init(&lrc->fence_ctx, hwe->gt,
hwe->fence_irq, hwe->name);
@ -898,6 +899,8 @@ int xe_lrc_init(struct xe_lrc *lrc, struct xe_hw_engine *hwe,
RING_CTL_SIZE(lrc->ring.size) | RING_VALID);
}
xe_lrc_write_ctx_reg(lrc, CTX_TIMESTAMP, 0);
if (xe->info.has_asid && vm)
xe_lrc_write_ctx_reg(lrc, PVC_CTX_ASID, vm->usm.asid);
@ -1576,3 +1579,12 @@ void xe_lrc_snapshot_free(struct xe_lrc_snapshot *snapshot)
xe_bo_put(snapshot->lrc_bo);
kfree(snapshot);
}
u32 xe_lrc_update_timestamp(struct xe_lrc *lrc, u32 *old_ts)
{
*old_ts = lrc->ctx_timestamp;
lrc->ctx_timestamp = xe_lrc_read_ctx_reg(lrc, CTX_TIMESTAMP);
return lrc->ctx_timestamp;
}

14
drivers/gpu/drm/xe/xe_lrc.h
View File

@ -66,4 +66,18 @@ void xe_lrc_snapshot_capture_delayed(struct xe_lrc_snapshot *snapshot);
void xe_lrc_snapshot_print(struct xe_lrc_snapshot *snapshot, struct drm_printer *p);
void xe_lrc_snapshot_free(struct xe_lrc_snapshot *snapshot);
/**
* xe_lrc_update_timestamp - readout LRC timestamp and update cached value
* @lrc: logical ring context for this exec queue
* @old_ts: pointer where to save the previous timestamp
*
* Read the current timestamp for this LRC and update the cached value. The
* previous cached value is also returned in @old_ts so the caller can calculate
* the delta between 2 updates. Note that this is not intended to be called from
* any place, but just by the paths updating the drm client utilization.
*
* Returns the current LRC timestamp
*/
u32 xe_lrc_update_timestamp(struct xe_lrc *lrc, u32 *old_ts);
#endif

3
drivers/gpu/drm/xe/xe_lrc_types.h
View File

@ -45,6 +45,9 @@ struct xe_lrc {
/** @fence_ctx: context for hw fence */
struct xe_hw_fence_ctx fence_ctx;
/** @ctx_timestamp: readout value of CTX_TIMESTAMP on last update */
u32 ctx_timestamp;
};
struct xe_lrc_snapshot;