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drm/xe: Implement xe_pagefault_handler

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Enqueue (copy) the input struct xe_pagefault into a queue (i.e., into a
memory buffer) and schedule a worker to service it.

Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Francois Dugast <francois.dugast@intel.com>
Tested-by: Francois Dugast <francois.dugast@intel.com>
Link: https://patch.msgid.link/20251031165416.2871503-5-matthew.brost@intel.com
This commit is contained in:
Matthew Brost
2025-10-31 09:54:13 -07:00
parent 79be336d1a
commit 143aa16572
1 changed files with 30 additions and 2 deletions
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32
drivers/gpu/drm/xe/xe_pagefault.c
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@@ -3,6 +3,8 @@
* Copyright © 2025 Intel Corporation
*/
#include <linux/circ_buf.h>
#include <drm/drm_managed.h>
#include "xe_device.h"
@@ -167,6 +169,14 @@ void xe_pagefault_reset(struct xe_device *xe, struct xe_gt *gt)
xe_pagefault_queue_reset(xe, gt, xe->usm.pf_queue + i);
}
static bool xe_pagefault_queue_full(struct xe_pagefault_queue *pf_queue)
{
lockdep_assert_held(&pf_queue->lock);
return CIRC_SPACE(pf_queue->head, pf_queue->tail, pf_queue->size) <=
xe_pagefault_entry_size();
}
/**
* xe_pagefault_handler() - Page fault handler
* @xe: xe device instance
@@ -179,6 +189,24 @@ void xe_pagefault_reset(struct xe_device *xe, struct xe_gt *gt)
*/
int xe_pagefault_handler(struct xe_device *xe, struct xe_pagefault *pf)
{
/* TODO - implement */
return 0;
struct xe_pagefault_queue *pf_queue = xe->usm.pf_queue +
(pf->consumer.asid % XE_PAGEFAULT_QUEUE_COUNT);
unsigned long flags;
bool full;
spin_lock_irqsave(&pf_queue->lock, flags);
full = xe_pagefault_queue_full(pf_queue);
if (!full) {
memcpy(pf_queue->data + pf_queue->head, pf, sizeof(*pf));
pf_queue->head = (pf_queue->head + xe_pagefault_entry_size()) %
pf_queue->size;
queue_work(xe->usm.pf_wq, &pf_queue->worker);
} else {
drm_warn(&xe->drm,
"PageFault Queue (%d) full, shouldn't be possible\n",
pf->consumer.asid % XE_PAGEFAULT_QUEUE_COUNT);
}
spin_unlock_irqrestore(&pf_queue->lock, flags);
return full ? -ENOSPC : 0;
}