drivers/gpu/drm/i915/gt/intel_context_param.c

   1 // SPDX-License-Identifier: MIT
   2 /*
   3  * Copyright © 2019 Intel Corporation
   4  */
   5
   6 #include "i915_active.h"
   7 #include "intel_context.h"
   8 #include "intel_context_param.h"
   9 #include "intel_ring.h"
  10
  11 int intel_context_set_ring_size(struct intel_context *ce, long sz)
  12 {
  13         int err;
  14
  15         if (intel_context_lock_pinned(ce))
  16                 return -EINTR;
  17
  18         err = i915_active_wait(&ce->active);
  19         if (err < 0)
  20                 goto unlock;
  21
  22         if (intel_context_is_pinned(ce)) {
  23                 err = -EBUSY; /* In active use, come back later! */
  24                 goto unlock;
  25         }
  26
  27         if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
  28                 struct intel_ring *ring;
  29
  30                 /* Replace the existing ringbuffer */
  31                 ring = intel_engine_create_ring(ce->engine, sz);
  32                 if (IS_ERR(ring)) {
  33                         err = PTR_ERR(ring);
  34                         goto unlock;
  35                 }
  36
  37                 intel_ring_put(ce->ring);
  38                 ce->ring = ring;
  39
  40                 /* Context image will be updated on next pin */
  41         } else {
  42                 ce->ring = __intel_context_ring_size(sz);
  43         }
  44
  45 unlock:
  46         intel_context_unlock_pinned(ce);
  47         return err;
  48 }
  49
  50 long intel_context_get_ring_size(struct intel_context *ce)
  51 {
  52         long sz = (unsigned long)READ_ONCE(ce->ring);
  53
  54         if (test_bit(CONTEXT_ALLOC_BIT, &ce->flags)) {
  55                 if (intel_context_lock_pinned(ce))
  56                         return -EINTR;
  57
  58                 sz = ce->ring->size;
  59                 intel_context_unlock_pinned(ce);
  60         }
  61
  62         return sz;
  63 }