[Intel-gfx] [PATCH 9/9] drm/i915/cmdparser: Accelerate copies from WC memory
Chris Wilson
chris at chris-wilson.co.uk
Fri Aug 12 15:07:30 UTC 2016
If we need to use clflush to prepare our batch for reads from memory, we
can bypass the cache instead by using non-temporal copies.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_cmd_parser.c | 58 ++++++++++++++++++++++------------
drivers/gpu/drm/i915/i915_debugfs.c | 24 --------------
drivers/gpu/drm/i915/i915_drv.c | 19 -----------
drivers/gpu/drm/i915/i915_gem.c | 48 ++++++++++++++++------------
drivers/gpu/drm/i915/i915_gem_gtt.c | 17 +++++++---
drivers/gpu/drm/i915/i915_gem_tiling.c | 4 ---
drivers/gpu/drm/i915/i915_irq.c | 2 --
drivers/gpu/drm/i915/intel_uncore.c | 6 ++--
8 files changed, 81 insertions(+), 97 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
index cea3ef7299cc..3244ef1401ad 100644
--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -969,8 +969,7 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,
{
unsigned int src_needs_clflush;
unsigned int dst_needs_clflush;
- void *dst, *ptr;
- int offset, n;
+ void *dst;
int ret;
ret = i915_gem_obj_prepare_shmem_read(src_obj, &src_needs_clflush);
@@ -987,24 +986,43 @@ static u32 *copy_batch(struct drm_i915_gem_object *dst_obj,
if (IS_ERR(dst))
goto unpin_dst;
- ptr = dst;
- offset = offset_in_page(batch_start_offset);
- if (dst_needs_clflush & CLFLUSH_BEFORE)
- batch_len = roundup(batch_len, boot_cpu_data.x86_clflush_size);
-
- for (n = batch_start_offset >> PAGE_SHIFT; batch_len; n++) {
- int len = min_t(int, batch_len, PAGE_SIZE - offset);
- void *vaddr;
-
- vaddr = kmap_atomic(i915_gem_object_get_page(src_obj, n));
- if (src_needs_clflush)
- drm_clflush_virt_range(vaddr + offset, len);
- memcpy(ptr, vaddr + offset, len);
- kunmap_atomic(vaddr);
-
- ptr += len;
- batch_len -= len;
- offset = 0;
+ if (src_needs_clflush &&
+ i915_memcpy_from_wc((void *)(uintptr_t)batch_start_offset, 0, 0)) {
+ void *src;
+
+ src = i915_gem_object_pin_map(src_obj, I915_MAP_WC);
+ if (IS_ERR(src))
+ goto shmem_copy;
+
+ i915_memcpy_from_wc(dst,
+ src + batch_start_offset,
+ ALIGN(batch_len, 16));
+ i915_gem_object_unpin_map(src_obj);
+ } else {
+ void *ptr;
+ int offset, n;
+
+shmem_copy:
+ offset = offset_in_page(batch_start_offset);
+ if (dst_needs_clflush & CLFLUSH_BEFORE)
+ batch_len = roundup(batch_len,
+ boot_cpu_data.x86_clflush_size);
+
+ ptr = dst;
+ for (n = batch_start_offset >> PAGE_SHIFT; batch_len; n++) {
+ int len = min_t(int, batch_len, PAGE_SIZE - offset);
+ void *vaddr;
+
+ vaddr = kmap_atomic(i915_gem_object_get_page(src_obj, n));
+ if (src_needs_clflush)
+ drm_clflush_virt_range(vaddr + offset, len);
+ memcpy(ptr, vaddr + offset, len);
+ kunmap_atomic(vaddr);
+
+ ptr += len;
+ batch_len -= len;
+ offset = 0;
+ }
}
/* dst_obj is returned with vmap pinned */
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 2fe88d930ca7..8dcdc27afe80 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -715,18 +715,13 @@ static int i915_gem_seqno_info(struct seq_file *m, void *data)
struct drm_device *dev = node->minor->dev;
struct drm_i915_private *dev_priv = to_i915(dev);
struct intel_engine_cs *engine;
- int ret;
- ret = mutex_lock_interruptible(&dev->struct_mutex);
- if (ret)
- return ret;
intel_runtime_pm_get(dev_priv);
for_each_engine(engine, dev_priv)
i915_ring_seqno_info(m, engine);
intel_runtime_pm_put(dev_priv);
- mutex_unlock(&dev->struct_mutex);
return 0;
}
@@ -1379,11 +1374,7 @@ static int ironlake_drpc_info(struct seq_file *m)
struct drm_i915_private *dev_priv = to_i915(dev);
u32 rgvmodectl, rstdbyctl;
u16 crstandvid;
- int ret;
- ret = mutex_lock_interruptible(&dev->struct_mutex);
- if (ret)
- return ret;
intel_runtime_pm_get(dev_priv);
rgvmodectl = I915_READ(MEMMODECTL);
@@ -1391,7 +1382,6 @@ static int ironlake_drpc_info(struct seq_file *m)
crstandvid = I915_READ16(CRSTANDVID);
intel_runtime_pm_put(dev_priv);
- mutex_unlock(&dev->struct_mutex);
seq_printf(m, "HD boost: %s\n", yesno(rgvmodectl & MEMMODE_BOOST_EN));
seq_printf(m, "Boost freq: %d\n",
@@ -2179,11 +2169,7 @@ static int i915_swizzle_info(struct seq_file *m, void *data)
struct drm_info_node *node = m->private;
struct drm_device *dev = node->minor->dev;
struct drm_i915_private *dev_priv = to_i915(dev);
- int ret;
- ret = mutex_lock_interruptible(&dev->struct_mutex);
- if (ret)
- return ret;
intel_runtime_pm_get(dev_priv);
seq_printf(m, "bit6 swizzle for X-tiling = %s\n",
@@ -2223,7 +2209,6 @@ static int i915_swizzle_info(struct seq_file *m, void *data)
seq_puts(m, "L-shaped memory detected\n");
intel_runtime_pm_put(dev_priv);
- mutex_unlock(&dev->struct_mutex);
return 0;
}
@@ -4729,13 +4714,9 @@ i915_wedged_set(void *data, u64 val)
if (i915_reset_in_progress(&dev_priv->gpu_error))
return -EAGAIN;
- intel_runtime_pm_get(dev_priv);
-
i915_handle_error(dev_priv, val,
"Manually setting wedged to %llu", val);
- intel_runtime_pm_put(dev_priv);
-
return 0;
}
@@ -4976,20 +4957,15 @@ i915_cache_sharing_get(void *data, u64 *val)
struct drm_device *dev = data;
struct drm_i915_private *dev_priv = to_i915(dev);
u32 snpcr;
- int ret;
if (!(IS_GEN6(dev) || IS_GEN7(dev)))
return -ENODEV;
- ret = mutex_lock_interruptible(&dev->struct_mutex);
- if (ret)
- return ret;
intel_runtime_pm_get(dev_priv);
snpcr = I915_READ(GEN6_MBCUNIT_SNPCR);
intel_runtime_pm_put(dev_priv);
- mutex_unlock(&dev_priv->drm.struct_mutex);
*val = (snpcr & GEN6_MBC_SNPCR_MASK) >> GEN6_MBC_SNPCR_SHIFT;
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index c040c6329804..b458faa0d349 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -2293,24 +2293,6 @@ static int intel_runtime_suspend(struct device *device)
DRM_DEBUG_KMS("Suspending device\n");
- /*
- * We could deadlock here in case another thread holding struct_mutex
- * calls RPM suspend concurrently, since the RPM suspend will wait
- * first for this RPM suspend to finish. In this case the concurrent
- * RPM resume will be followed by its RPM suspend counterpart. Still
- * for consistency return -EAGAIN, which will reschedule this suspend.
- */
- if (!mutex_trylock(&dev->struct_mutex)) {
- DRM_DEBUG_KMS("device lock contention, deffering suspend\n");
- /*
- * Bump the expiration timestamp, otherwise the suspend won't
- * be rescheduled.
- */
- pm_runtime_mark_last_busy(device);
-
- return -EAGAIN;
- }
-
disable_rpm_wakeref_asserts(dev_priv);
/*
@@ -2318,7 +2300,6 @@ static int intel_runtime_suspend(struct device *device)
* an RPM reference.
*/
i915_gem_release_all_mmaps(dev_priv);
- mutex_unlock(&dev->struct_mutex);
intel_guc_suspend(dev);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 5c1acfc10bc4..a26bfd7d6aab 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1434,11 +1434,9 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
if (ret)
goto err;
- intel_runtime_pm_get(dev_priv);
-
ret = i915_mutex_lock_interruptible(dev);
if (ret)
- goto err_rpm;
+ goto err;
ret = -EFAULT;
/* We can only do the GTT pwrite on untiled buffers, as otherwise
@@ -1449,7 +1447,9 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
*/
if (!i915_gem_object_has_struct_page(obj) ||
cpu_write_needs_clflush(obj)) {
+ intel_runtime_pm_get(dev_priv);
ret = i915_gem_gtt_pwrite_fast(dev_priv, obj, args, file);
+ intel_runtime_pm_put(dev_priv);
/* Note that the gtt paths might fail with non-page-backed user
* pointers (e.g. gtt mappings when moving data between
* textures). Fallback to the shmem path in that case. */
@@ -1464,12 +1464,8 @@ i915_gem_pwrite_ioctl(struct drm_device *dev, void *data,
i915_gem_object_put(obj);
mutex_unlock(&dev->struct_mutex);
- intel_runtime_pm_put(dev_priv);
-
return ret;
-err_rpm:
- intel_runtime_pm_put(dev_priv);
err:
i915_gem_object_put_unlocked(obj);
return ret;
@@ -1833,9 +1829,13 @@ i915_gem_release_mmap(struct drm_i915_gem_object *obj)
/* Serialisation between user GTT access and our code depends upon
* revoking the CPU's PTE whilst the mutex is held. The next user
* pagefault then has to wait until we release the mutex.
+ *
+ * Note that RPM complicates somewhat by adding an additional
+ * requirement that operations to the GGTT be made holding the RPM
+ * wakeref. This in turns allow us to release the mmap from within
+ * the RPM suspend code ignoring the struct_mutex serialisation in
+ * lieu of the RPM barriers.
*/
- lockdep_assert_held(&obj->base.dev->struct_mutex);
-
if (!obj->fault_mappable)
return;
@@ -1854,11 +1854,21 @@ i915_gem_release_mmap(struct drm_i915_gem_object *obj)
obj->fault_mappable = false;
}
+static void assert_rpm_release_all_mmaps(struct drm_i915_private *dev_priv)
+{
+ assert_rpm_wakelock_held(dev_priv);
+}
+
void
i915_gem_release_all_mmaps(struct drm_i915_private *dev_priv)
{
struct drm_i915_gem_object *obj;
+ /* This should only be called by RPM as we require the bound_list
+ * to be protected by the RPM barriers and not struct_mutex.
+ * We check that we are holding the wakeref whenever we manipulate
+ * the dev_priv->mm.bound_list (via assert_rpm_release_all_mmaps).
+ */
list_for_each_entry(obj, &dev_priv->mm.bound_list, global_list)
i915_gem_release_mmap(obj);
}
@@ -2402,9 +2412,11 @@ i915_gem_object_retire__read(struct i915_gem_active *active,
* so that we don't steal from recently used but inactive objects
* (unless we are forced to ofc!)
*/
- if (obj->bind_count)
+ if (obj->bind_count) {
+ assert_rpm_release_all_mmaps(request->i915);
list_move_tail(&obj->global_list,
&request->i915->mm.bound_list);
+ }
if (i915_gem_object_has_active_reference(obj)) {
i915_gem_object_clear_active_reference(obj);
@@ -2881,9 +2893,11 @@ int i915_vma_unbind(struct i915_vma *vma)
/* Since the unbound list is global, only move to that list if
* no more VMAs exist. */
- if (--obj->bind_count == 0)
+ if (--obj->bind_count == 0) {
+ assert_rpm_release_all_mmaps(to_i915(obj->base.dev));
list_move_tail(&obj->global_list,
&to_i915(obj->base.dev)->mm.unbound_list);
+ }
/* And finally now the object is completely decoupled from this vma,
* we can drop its hold on the backing storage and allow it to be
@@ -3071,6 +3085,7 @@ search_free:
}
GEM_BUG_ON(!i915_gem_valid_gtt_space(vma, obj->cache_level));
+ assert_rpm_release_all_mmaps(dev_priv);
list_move_tail(&obj->global_list, &dev_priv->mm.bound_list);
list_move_tail(&vma->vm_link, &vma->vm->inactive_list);
obj->bind_count++;
@@ -3420,7 +3435,6 @@ int i915_gem_get_caching_ioctl(struct drm_device *dev, void *data,
int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
struct drm_file *file)
{
- struct drm_i915_private *dev_priv = to_i915(dev);
struct drm_i915_gem_caching *args = data;
struct drm_i915_gem_object *obj;
enum i915_cache_level level;
@@ -3449,11 +3463,9 @@ int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
return -EINVAL;
}
- intel_runtime_pm_get(dev_priv);
-
ret = i915_mutex_lock_interruptible(dev);
if (ret)
- goto rpm_put;
+ return ret;
obj = i915_gem_object_lookup(file, args->handle);
if (!obj) {
@@ -3462,13 +3474,9 @@ int i915_gem_set_caching_ioctl(struct drm_device *dev, void *data,
}
ret = i915_gem_object_set_cache_level(obj, level);
-
i915_gem_object_put(obj);
unlock:
mutex_unlock(&dev->struct_mutex);
-rpm_put:
- intel_runtime_pm_put(dev_priv);
-
return ret;
}
@@ -4174,8 +4182,6 @@ void i915_gem_free_object(struct drm_gem_object *gem_obj)
kfree(obj->bit_17);
i915_gem_object_free(obj);
-
- intel_runtime_pm_put(dev_priv);
}
void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index fe7f9887ee67..67a3ff960b0d 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2594,6 +2594,7 @@ static int ggtt_bind_vma(struct i915_vma *vma,
enum i915_cache_level cache_level,
u32 flags)
{
+ struct drm_i915_private *i915 = to_i915(vma->vm->dev);
struct drm_i915_gem_object *obj = vma->obj;
u32 pte_flags = 0;
int ret;
@@ -2606,8 +2607,10 @@ static int ggtt_bind_vma(struct i915_vma *vma,
if (obj->gt_ro)
pte_flags |= PTE_READ_ONLY;
+ intel_runtime_pm_get(i915);
vma->vm->insert_entries(vma->vm, vma->pages, vma->node.start,
cache_level, pte_flags);
+ intel_runtime_pm_get(i915);
/*
* Without aliasing PPGTT there's no difference between
@@ -2623,6 +2626,7 @@ static int aliasing_gtt_bind_vma(struct i915_vma *vma,
enum i915_cache_level cache_level,
u32 flags)
{
+ struct drm_i915_private *i915 = to_i915(vma->vm->dev);
u32 pte_flags;
int ret;
@@ -2637,14 +2641,15 @@ static int aliasing_gtt_bind_vma(struct i915_vma *vma,
if (flags & I915_VMA_GLOBAL_BIND) {
+ intel_runtime_pm_get(i915);
vma->vm->insert_entries(vma->vm,
vma->pages, vma->node.start,
cache_level, pte_flags);
+ intel_runtime_pm_put(i915);
}
if (flags & I915_VMA_LOCAL_BIND) {
- struct i915_hw_ppgtt *appgtt =
- to_i915(vma->vm->dev)->mm.aliasing_ppgtt;
+ struct i915_hw_ppgtt *appgtt = i915->mm.aliasing_ppgtt;
appgtt->base.insert_entries(&appgtt->base,
vma->pages, vma->node.start,
cache_level, pte_flags);
@@ -2655,13 +2660,17 @@ static int aliasing_gtt_bind_vma(struct i915_vma *vma,
static void ggtt_unbind_vma(struct i915_vma *vma)
{
- struct i915_hw_ppgtt *appgtt = to_i915(vma->vm->dev)->mm.aliasing_ppgtt;
+ struct drm_i915_private *i915 = to_i915(vma->vm->dev);
+ struct i915_hw_ppgtt *appgtt = i915->mm.aliasing_ppgtt;
const u64 size = min(vma->size, vma->node.size);
- if (vma->flags & I915_VMA_GLOBAL_BIND)
+ if (vma->flags & I915_VMA_GLOBAL_BIND) {
+ intel_runtime_pm_get(i915);
vma->vm->clear_range(vma->vm,
vma->node.start, size,
true);
+ intel_runtime_pm_put(i915);
+ }
if (vma->flags & I915_VMA_LOCAL_BIND && appgtt)
appgtt->base.clear_range(&appgtt->base,
diff --git a/drivers/gpu/drm/i915/i915_gem_tiling.c b/drivers/gpu/drm/i915/i915_gem_tiling.c
index a14b1e3d4c78..08f796a4f5f6 100644
--- a/drivers/gpu/drm/i915/i915_gem_tiling.c
+++ b/drivers/gpu/drm/i915/i915_gem_tiling.c
@@ -204,8 +204,6 @@ i915_gem_set_tiling(struct drm_device *dev, void *data,
return -EINVAL;
}
- intel_runtime_pm_get(dev_priv);
-
mutex_lock(&dev->struct_mutex);
if (obj->pin_display || obj->framebuffer_references) {
err = -EBUSY;
@@ -301,8 +299,6 @@ err:
i915_gem_object_put(obj);
mutex_unlock(&dev->struct_mutex);
- intel_runtime_pm_put(dev_priv);
-
return err;
}
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index ebb83d5a448b..3d9c2a21dfbd 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -2523,7 +2523,6 @@ static void i915_reset_and_wakeup(struct drm_i915_private *dev_priv)
* simulated reset via debugs, so get an RPM reference.
*/
intel_runtime_pm_get(dev_priv);
-
intel_prepare_reset(dev_priv);
/*
@@ -2535,7 +2534,6 @@ static void i915_reset_and_wakeup(struct drm_i915_private *dev_priv)
ret = i915_reset(dev_priv);
intel_finish_reset(dev_priv);
-
intel_runtime_pm_put(dev_priv);
if (ret == 0)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 43f833901b8e..a6b04da4bf21 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -1414,7 +1414,7 @@ int i915_reg_read_ioctl(struct drm_device *dev,
struct register_whitelist const *entry = whitelist;
unsigned size;
i915_reg_t offset_ldw, offset_udw;
- int i, ret = 0;
+ int i, ret;
for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
if (i915_mmio_reg_offset(entry->offset_ldw) == (reg->offset & -entry->size) &&
@@ -1436,6 +1436,7 @@ int i915_reg_read_ioctl(struct drm_device *dev,
intel_runtime_pm_get(dev_priv);
+ ret = 0;
switch (size) {
case 8 | 1:
reg->val = I915_READ64_2x32(offset_ldw, offset_udw);
@@ -1454,10 +1455,9 @@ int i915_reg_read_ioctl(struct drm_device *dev,
break;
default:
ret = -EINVAL;
- goto out;
+ break;
}
-out:
intel_runtime_pm_put(dev_priv);
return ret;
}
--
2.8.1
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