drm/radeon: allocate semaphore from the ib pool

This allow to share the ib pool with semaphore and avoid
having more bo around.

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index 0301896..374f9a4 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -242,32 +242,6 @@ struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence);
 void radeon_fence_unref(struct radeon_fence **fence);
 int radeon_fence_count_emitted(struct radeon_device *rdev, int ring);
 
-/*
- * Semaphores.
- */
-struct radeon_ring;
-
-struct radeon_semaphore_driver {
-       rwlock_t                lock;
-       struct list_head        free;
-};
-
-struct radeon_semaphore {
-       struct radeon_bo        *robj;
-       struct list_head        list;
-       uint64_t                gpu_addr;
-};
-
-void radeon_semaphore_driver_fini(struct radeon_device *rdev);
-int radeon_semaphore_create(struct radeon_device *rdev,
-                           struct radeon_semaphore **semaphore);
-void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
-                                 struct radeon_semaphore *semaphore);
-void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
-                               struct radeon_semaphore *semaphore);
-void radeon_semaphore_free(struct radeon_device *rdev,
-                          struct radeon_semaphore *semaphore);
-
 /*
  * Tiling registers
  */
@@ -386,6 +360,46 @@ int radeon_mode_dumb_destroy(struct drm_file *file_priv,
                             struct drm_device *dev,
                             uint32_t handle);
 
+/*
+ * Semaphores.
+ */
+struct radeon_ring;
+
+#define        RADEON_SEMAPHORE_BO_SIZE        256
+
+struct radeon_semaphore_driver {
+       rwlock_t                        lock;
+       struct list_head                bo;
+};
+
+struct radeon_semaphore_bo;
+
+/* everything here is constant */
+struct radeon_semaphore {
+       struct list_head                list;
+       uint64_t                        gpu_addr;
+       uint32_t                        *cpu_ptr;
+       struct radeon_semaphore_bo      *bo;
+};
+
+struct radeon_semaphore_bo {
+       struct list_head                list;
+       struct radeon_ib                *ib;
+       struct list_head                free;
+       struct radeon_semaphore         semaphores[RADEON_SEMAPHORE_BO_SIZE/8];
+       unsigned                        nused;
+};
+
+void radeon_semaphore_driver_fini(struct radeon_device *rdev);
+int radeon_semaphore_create(struct radeon_device *rdev,
+                           struct radeon_semaphore **semaphore);
+void radeon_semaphore_emit_signal(struct radeon_device *rdev, int ring,
+                                 struct radeon_semaphore *semaphore);
+void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
+                               struct radeon_semaphore *semaphore);
+void radeon_semaphore_free(struct radeon_device *rdev,
+                          struct radeon_semaphore *semaphore);
+
 /*
  * GART structures, functions & helpers
  */
@@ -641,6 +655,7 @@ void r600_blit_suspend(struct radeon_device *rdev);
 int radeon_ib_get(struct radeon_device *rdev, int ring,
                  struct radeon_ib **ib, unsigned size);
 void radeon_ib_free(struct radeon_device *rdev, struct radeon_ib **ib);
+bool radeon_ib_try_free(struct radeon_device *rdev, struct radeon_ib *ib);
 int radeon_ib_schedule(struct radeon_device *rdev, struct radeon_ib *ib);
 int radeon_ib_pool_init(struct radeon_device *rdev);
 void radeon_ib_pool_fini(struct radeon_device *rdev);

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index e81c333..846eeb8 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -731,7 +731,7 @@ int radeon_device_init(struct radeon_device *rdev,
        INIT_LIST_HEAD(&rdev->gem.objects);
        init_waitqueue_head(&rdev->irq.vblank_queue);
        init_waitqueue_head(&rdev->irq.idle_queue);
-       INIT_LIST_HEAD(&rdev->semaphore_drv.free);
+       INIT_LIST_HEAD(&rdev->semaphore_drv.bo);
 
        /* Set asic functions */
        r = radeon_asic_init(rdev);

diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index bc844fe..465fb34 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -77,8 +77,7 @@ void radeon_ring_write(struct radeon_ring *ring, uint32_t v)
 /*
  * IB.
  */
-static bool radeon_ib_try_free(struct radeon_device *rdev,
-                              struct radeon_ib *ib)
+bool radeon_ib_try_free(struct radeon_device *rdev, struct radeon_ib *ib)
 {
        bool done = false;
 
@@ -148,7 +147,7 @@ retry:
        /* this should be rare event, ie all ib scheduled none signaled yet.
         */
        for (i = 0; i < RADEON_IB_POOL_SIZE; i++) {
-               if (rdev->ib_pool.ibs[idx].fence) {
+               if (rdev->ib_pool.ibs[idx].fence && rdev->ib_pool.ibs[idx].fence->emitted) {
                        r = radeon_fence_wait(rdev->ib_pool.ibs[idx].fence, false);
                        if (!r) {
                                goto retry;

diff --git a/drivers/gpu/drm/radeon/radeon_semaphore.c b/drivers/gpu/drm/radeon/radeon_semaphore.c
index f8cf044..61dd4e3 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_semaphore.c
+++ b/drivers/gpu/drm/radeon/radeon_semaphore.c
@@ -31,90 +31,109 @@
 #include "drm.h"
 #include "radeon.h"
 
-static int allocate_semaphores(struct radeon_device *rdev)
+static int radeon_semaphore_add_bo(struct radeon_device *rdev)
 {
-       const unsigned long bo_size = PAGE_SIZE * 4;
-
-       struct radeon_bo *bo;
-       struct list_head new_entrys;
+       struct radeon_semaphore_bo *bo;
        unsigned long irq_flags;
        uint64_t gpu_addr;
-       void *map;
-       int i, r;
+       uint32_t *cpu_ptr;
+       int r, i;
 
-       r = radeon_bo_create(rdev, bo_size, RADEON_GPU_PAGE_SIZE, true,
-                            RADEON_GEM_DOMAIN_GTT, &bo);
-       if (r) {
-               dev_err(rdev->dev, "(%d) failed to allocate semaphore bo\n", r);
-               return r;
-       }
-
-       r = radeon_bo_reserve(bo, false);
-       if (r) {
-               radeon_bo_unref(&bo);
-               dev_err(rdev->dev, "(%d) failed to reserve semaphore bo\n", r);
-               return r;
-       }
 
-       r = radeon_bo_kmap(bo, &map);
-       if (r) {
-               radeon_bo_unreserve(bo);
-               radeon_bo_unref(&bo);
-               dev_err(rdev->dev, "(%d) semaphore map failed\n", r);
-               return r;
+       bo = kmalloc(sizeof(struct radeon_semaphore_bo), GFP_KERNEL);
+       if (bo == NULL) {
+               return -ENOMEM;
        }
-       memset(map, 0, bo_size);
-       radeon_bo_kunmap(bo);
+       INIT_LIST_HEAD(&bo->free);
+       INIT_LIST_HEAD(&bo->list);
+       bo->nused = 0;
 
-       r = radeon_bo_pin(bo, RADEON_GEM_DOMAIN_VRAM, &gpu_addr);
+       r = radeon_ib_get(rdev, 0, &bo->ib, RADEON_SEMAPHORE_BO_SIZE);
        if (r) {
-               radeon_bo_unreserve(bo);
-               radeon_bo_unref(&bo);
-               dev_err(rdev->dev, "(%d) semaphore pin failed\n", r);
+               dev_err(rdev->dev, "failed to get a bo after 5 retry\n");
+               kfree(bo);
                return r;
        }
-
-       INIT_LIST_HEAD(&new_entrys);
-       for (i = 0; i < bo_size/8; ++i) {
-               struct radeon_semaphore *sem = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL);
-               ttm_bo_reference(&bo->tbo);
-               sem->robj = bo;
-               sem->gpu_addr = gpu_addr;
+       gpu_addr = rdev->ib_pool.sa_manager.gpu_addr;
+       gpu_addr += bo->ib->sa_bo.offset;
+       cpu_ptr = rdev->ib_pool.sa_manager.cpu_ptr;
+       cpu_ptr += (bo->ib->sa_bo.offset >> 2);
+       for (i = 0; i < (RADEON_SEMAPHORE_BO_SIZE/8); i++) {
+               bo->semaphores[i].gpu_addr = gpu_addr;
+               bo->semaphores[i].cpu_ptr = cpu_ptr;
+               bo->semaphores[i].bo = bo;
+               list_add_tail(&bo->semaphores[i].list, &bo->free);
                gpu_addr += 8;
-               list_add_tail(&sem->list, &new_entrys);
+               cpu_ptr += 2;
        }
-
-       radeon_bo_unreserve(bo);
-       radeon_bo_unref(&bo);
-
        write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
-       list_splice_tail(&new_entrys, &rdev->semaphore_drv.free);
+       list_add_tail(&bo->list, &rdev->semaphore_drv.bo);
        write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
+       return 0;
+}
 
-       DRM_INFO("%d new semaphores allocated\n", (int)(bo_size/8));
+static void radeon_semaphore_del_bo_locked(struct radeon_device *rdev,
+                                          struct radeon_semaphore_bo *bo)
+{
+       radeon_sa_bo_free(rdev, &bo->ib->sa_bo);
+       radeon_fence_unref(&bo->ib->fence);
+       list_del(&bo->list);
+       kfree(bo);
+}
 
-       return 0;
+void radeon_semaphore_shrink_locked(struct radeon_device *rdev)
+{
+       struct radeon_semaphore_bo *bo, *n;
+
+       if (list_empty(&rdev->semaphore_drv.bo)) {
+               return;
+       }
+       /* only shrink if first bo has free semaphore */
+       bo = list_first_entry(&rdev->semaphore_drv.bo, struct radeon_semaphore_bo, list);
+       if (list_empty(&bo->free)) {
+               return;
+       }
+       list_for_each_entry_safe_continue(bo, n, &rdev->semaphore_drv.bo, list) {
+               if (bo->nused)
+                       continue;
+               radeon_semaphore_del_bo_locked(rdev, bo);
+       }
 }
 
 int radeon_semaphore_create(struct radeon_device *rdev,
                            struct radeon_semaphore **semaphore)
 {
+       struct radeon_semaphore_bo *bo;
        unsigned long irq_flags;
+       bool do_retry = true;
+       int r;
 
+retry:
+       *semaphore = NULL;
        write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
-       if (list_empty(&rdev->semaphore_drv.free)) {
-               int r;
-               write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
-               r = allocate_semaphores(rdev);
-               if (r)
-                       return r;
-               write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
+       list_for_each_entry(bo, &rdev->semaphore_drv.bo, list) {
+               if (list_empty(&bo->free))
+                       continue;
+               *semaphore = list_first_entry(&bo->free, struct radeon_semaphore, list);
+               (*semaphore)->cpu_ptr[0] = 0;
+               (*semaphore)->cpu_ptr[1] = 0;
+               list_del(&(*semaphore)->list);
+               bo->nused++;
+               break;
        }
+       write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
 
-       *semaphore = list_first_entry(&rdev->semaphore_drv.free, struct radeon_semaphore, list);
-       list_del(&(*semaphore)->list);
+       if (*semaphore == NULL) {
+               if (do_retry) {
+                       do_retry = false;
+                       r = radeon_semaphore_add_bo(rdev);
+                       if (r)
+                               return r;
+                       goto retry;
+               }
+               return -ENOMEM;
+       }
 
-       write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
        return 0;
 }
 
@@ -131,31 +150,29 @@ void radeon_semaphore_emit_wait(struct radeon_device *rdev, int ring,
 }
 
 void radeon_semaphore_free(struct radeon_device *rdev,
-                         struct radeon_semaphore *semaphore)
+                          struct radeon_semaphore *semaphore)
 {
        unsigned long irq_flags;
 
        write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
-       list_add_tail(&semaphore->list, &rdev->semaphore_drv.free);
+       semaphore->bo->nused--;
+       list_add_tail(&semaphore->list, &semaphore->bo->free);
+       radeon_semaphore_shrink_locked(rdev);
        write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
 }
 
 void radeon_semaphore_driver_fini(struct radeon_device *rdev)
 {
-       struct radeon_semaphore *i, *n;
-       struct list_head entrys;
+       struct radeon_semaphore_bo *bo, *n;
        unsigned long irq_flags;
 
-       INIT_LIST_HEAD(&entrys);
        write_lock_irqsave(&rdev->semaphore_drv.lock, irq_flags);
-       if (!list_empty(&rdev->semaphore_drv.free)) {
-               list_splice(&rdev->semaphore_drv.free, &entrys);
+       /* we force to free everything */
+       list_for_each_entry_safe(bo, n, &rdev->semaphore_drv.bo, list) {
+               if (!list_empty(&bo->free)) {
+                       dev_err(rdev->dev, "still in use semaphore\n");
+               }
+               radeon_semaphore_del_bo_locked(rdev, bo);
        }
-       INIT_LIST_HEAD(&rdev->semaphore_drv.free);
        write_unlock_irqrestore(&rdev->semaphore_drv.lock, irq_flags);
-
-       list_for_each_entry_safe(i, n, &entrys, list) {
-               radeon_bo_unref(&i->robj);
-               kfree(i);
-       }
 }