diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem.c | 1328 |
1 files changed, 1328 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c new file mode 100644 index 000000000..38c26668b --- /dev/null +++ b/drivers/gpu/drm/i915/i915_gem.c @@ -0,0 +1,1328 @@ +/* + * Copyright © 2008-2015 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + * Authors: + * Eric Anholt <eric@anholt.net> + * + */ + +#include <linux/dma-fence-array.h> +#include <linux/kthread.h> +#include <linux/dma-resv.h> +#include <linux/shmem_fs.h> +#include <linux/slab.h> +#include <linux/stop_machine.h> +#include <linux/swap.h> +#include <linux/pci.h> +#include <linux/dma-buf.h> +#include <linux/mman.h> + +#include <drm/drm_cache.h> +#include <drm/drm_vma_manager.h> + +#include "display/intel_display.h" +#include "display/intel_frontbuffer.h" + +#include "gem/i915_gem_clflush.h" +#include "gem/i915_gem_context.h" +#include "gem/i915_gem_ioctls.h" +#include "gem/i915_gem_mman.h" +#include "gem/i915_gem_pm.h" +#include "gem/i915_gem_region.h" +#include "gem/i915_gem_userptr.h" +#include "gt/intel_engine_user.h" +#include "gt/intel_gt.h" +#include "gt/intel_gt_pm.h" +#include "gt/intel_workarounds.h" + +#include "i915_drv.h" +#include "i915_file_private.h" +#include "i915_trace.h" +#include "i915_vgpu.h" +#include "intel_pm.h" + +static int +insert_mappable_node(struct i915_ggtt *ggtt, struct drm_mm_node *node, u32 size) +{ + int err; + + err = mutex_lock_interruptible(&ggtt->vm.mutex); + if (err) + return err; + + memset(node, 0, sizeof(*node)); + err = drm_mm_insert_node_in_range(&ggtt->vm.mm, node, + size, 0, I915_COLOR_UNEVICTABLE, + 0, ggtt->mappable_end, + DRM_MM_INSERT_LOW); + + mutex_unlock(&ggtt->vm.mutex); + + return err; +} + +static void +remove_mappable_node(struct i915_ggtt *ggtt, struct drm_mm_node *node) +{ + mutex_lock(&ggtt->vm.mutex); + drm_mm_remove_node(node); + mutex_unlock(&ggtt->vm.mutex); +} + +int +i915_gem_get_aperture_ioctl(struct drm_device *dev, void *data, + struct drm_file *file) +{ + struct drm_i915_private *i915 = to_i915(dev); + struct i915_ggtt *ggtt = to_gt(i915)->ggtt; + struct drm_i915_gem_get_aperture *args = data; + struct i915_vma *vma; + u64 pinned; + + if (mutex_lock_interruptible(&ggtt->vm.mutex)) + return -EINTR; + + pinned = ggtt->vm.reserved; + list_for_each_entry(vma, &ggtt->vm.bound_list, vm_link) + if (i915_vma_is_pinned(vma)) + pinned += vma->node.size; + + mutex_unlock(&ggtt->vm.mutex); + + args->aper_size = ggtt->vm.total; + args->aper_available_size = args->aper_size - pinned; + + return 0; +} + +int i915_gem_object_unbind(struct drm_i915_gem_object *obj, + unsigned long flags) +{ + struct intel_runtime_pm *rpm = &to_i915(obj->base.dev)->runtime_pm; + bool vm_trylock = !!(flags & I915_GEM_OBJECT_UNBIND_VM_TRYLOCK); + LIST_HEAD(still_in_list); + intel_wakeref_t wakeref; + struct i915_vma *vma; + int ret; + + assert_object_held(obj); + + if (list_empty(&obj->vma.list)) + return 0; + + /* + * As some machines use ACPI to handle runtime-resume callbacks, and + * ACPI is quite kmalloc happy, we cannot resume beneath the vm->mutex + * as they are required by the shrinker. Ergo, we wake the device up + * first just in case. + */ + wakeref = intel_runtime_pm_get(rpm); + +try_again: + ret = 0; + spin_lock(&obj->vma.lock); + while (!ret && (vma = list_first_entry_or_null(&obj->vma.list, + struct i915_vma, + obj_link))) { + list_move_tail(&vma->obj_link, &still_in_list); + if (!i915_vma_is_bound(vma, I915_VMA_BIND_MASK)) + continue; + + if (flags & I915_GEM_OBJECT_UNBIND_TEST) { + ret = -EBUSY; + break; + } + + /* + * Requiring the vm destructor to take the object lock + * before destroying a vma would help us eliminate the + * i915_vm_tryget() here, AND thus also the barrier stuff + * at the end. That's an easy fix, but sleeping locks in + * a kthread should generally be avoided. + */ + ret = -EAGAIN; + if (!i915_vm_tryget(vma->vm)) + break; + + spin_unlock(&obj->vma.lock); + + /* + * Since i915_vma_parked() takes the object lock + * before vma destruction, it won't race us here, + * and destroy the vma from under us. + */ + + ret = -EBUSY; + if (flags & I915_GEM_OBJECT_UNBIND_ASYNC) { + assert_object_held(vma->obj); + ret = i915_vma_unbind_async(vma, vm_trylock); + } + + if (ret == -EBUSY && (flags & I915_GEM_OBJECT_UNBIND_ACTIVE || + !i915_vma_is_active(vma))) { + if (vm_trylock) { + if (mutex_trylock(&vma->vm->mutex)) { + ret = __i915_vma_unbind(vma); + mutex_unlock(&vma->vm->mutex); + } + } else { + ret = i915_vma_unbind(vma); + } + } + + i915_vm_put(vma->vm); + spin_lock(&obj->vma.lock); + } + list_splice_init(&still_in_list, &obj->vma.list); + spin_unlock(&obj->vma.lock); + + if (ret == -EAGAIN && flags & I915_GEM_OBJECT_UNBIND_BARRIER) { + rcu_barrier(); /* flush the i915_vm_release() */ + goto try_again; + } + + intel_runtime_pm_put(rpm, wakeref); + + return ret; +} + +static int +shmem_pread(struct page *page, int offset, int len, char __user *user_data, + bool needs_clflush) +{ + char *vaddr; + int ret; + + vaddr = kmap(page); + + if (needs_clflush) + drm_clflush_virt_range(vaddr + offset, len); + + ret = __copy_to_user(user_data, vaddr + offset, len); + + kunmap(page); + + return ret ? -EFAULT : 0; +} + +static int +i915_gem_shmem_pread(struct drm_i915_gem_object *obj, + struct drm_i915_gem_pread *args) +{ + unsigned int needs_clflush; + unsigned int idx, offset; + char __user *user_data; + u64 remain; + int ret; + + ret = i915_gem_object_lock_interruptible(obj, NULL); + if (ret) + return ret; + + ret = i915_gem_object_pin_pages(obj); + if (ret) + goto err_unlock; + + ret = i915_gem_object_prepare_read(obj, &needs_clflush); + if (ret) + goto err_unpin; + + i915_gem_object_finish_access(obj); + i915_gem_object_unlock(obj); + + remain = args->size; + user_data = u64_to_user_ptr(args->data_ptr); + offset = offset_in_page(args->offset); + for (idx = args->offset >> PAGE_SHIFT; remain; idx++) { + struct page *page = i915_gem_object_get_page(obj, idx); + unsigned int length = min_t(u64, remain, PAGE_SIZE - offset); + + ret = shmem_pread(page, offset, length, user_data, + needs_clflush); + if (ret) + break; + + remain -= length; + user_data += length; + offset = 0; + } + + i915_gem_object_unpin_pages(obj); + return ret; + +err_unpin: + i915_gem_object_unpin_pages(obj); +err_unlock: + i915_gem_object_unlock(obj); + return ret; +} + +static inline bool +gtt_user_read(struct io_mapping *mapping, + loff_t base, int offset, + char __user *user_data, int length) +{ + void __iomem *vaddr; + unsigned long unwritten; + + /* We can use the cpu mem copy function because this is X86. */ + vaddr = io_mapping_map_atomic_wc(mapping, base); + unwritten = __copy_to_user_inatomic(user_data, + (void __force *)vaddr + offset, + length); + io_mapping_unmap_atomic(vaddr); + if (unwritten) { + vaddr = io_mapping_map_wc(mapping, base, PAGE_SIZE); + unwritten = copy_to_user(user_data, + (void __force *)vaddr + offset, + length); + io_mapping_unmap(vaddr); + } + return unwritten; +} + +static struct i915_vma *i915_gem_gtt_prepare(struct drm_i915_gem_object *obj, + struct drm_mm_node *node, + bool write) +{ + struct drm_i915_private *i915 = to_i915(obj->base.dev); + struct i915_ggtt *ggtt = to_gt(i915)->ggtt; + struct i915_vma *vma; + struct i915_gem_ww_ctx ww; + int ret; + + i915_gem_ww_ctx_init(&ww, true); +retry: + vma = ERR_PTR(-ENODEV); + ret = i915_gem_object_lock(obj, &ww); + if (ret) + goto err_ww; + + ret = i915_gem_object_set_to_gtt_domain(obj, write); + if (ret) + goto err_ww; + + if (!i915_gem_object_is_tiled(obj)) + vma = i915_gem_object_ggtt_pin_ww(obj, &ww, NULL, 0, 0, + PIN_MAPPABLE | + PIN_NONBLOCK /* NOWARN */ | + PIN_NOEVICT); + if (vma == ERR_PTR(-EDEADLK)) { + ret = -EDEADLK; + goto err_ww; + } else if (!IS_ERR(vma)) { + node->start = i915_ggtt_offset(vma); + node->flags = 0; + } else { + ret = insert_mappable_node(ggtt, node, PAGE_SIZE); + if (ret) + goto err_ww; + GEM_BUG_ON(!drm_mm_node_allocated(node)); + vma = NULL; + } + + ret = i915_gem_object_pin_pages(obj); + if (ret) { + if (drm_mm_node_allocated(node)) { + ggtt->vm.clear_range(&ggtt->vm, node->start, node->size); + remove_mappable_node(ggtt, node); + } else { + i915_vma_unpin(vma); + } + } + +err_ww: + if (ret == -EDEADLK) { + ret = i915_gem_ww_ctx_backoff(&ww); + if (!ret) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); + + return ret ? ERR_PTR(ret) : vma; +} + +static void i915_gem_gtt_cleanup(struct drm_i915_gem_object *obj, + struct drm_mm_node *node, + struct i915_vma *vma) +{ + struct drm_i915_private *i915 = to_i915(obj->base.dev); + struct i915_ggtt *ggtt = to_gt(i915)->ggtt; + + i915_gem_object_unpin_pages(obj); + if (drm_mm_node_allocated(node)) { + ggtt->vm.clear_range(&ggtt->vm, node->start, node->size); + remove_mappable_node(ggtt, node); + } else { + i915_vma_unpin(vma); + } +} + +static int +i915_gem_gtt_pread(struct drm_i915_gem_object *obj, + const struct drm_i915_gem_pread *args) +{ + struct drm_i915_private *i915 = to_i915(obj->base.dev); + struct i915_ggtt *ggtt = to_gt(i915)->ggtt; + intel_wakeref_t wakeref; + struct drm_mm_node node; + void __user *user_data; + struct i915_vma *vma; + u64 remain, offset; + int ret = 0; + + wakeref = intel_runtime_pm_get(&i915->runtime_pm); + + vma = i915_gem_gtt_prepare(obj, &node, false); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + goto out_rpm; + } + + user_data = u64_to_user_ptr(args->data_ptr); + remain = args->size; + offset = args->offset; + + while (remain > 0) { + /* Operation in this page + * + * page_base = page offset within aperture + * page_offset = offset within page + * page_length = bytes to copy for this page + */ + u32 page_base = node.start; + unsigned page_offset = offset_in_page(offset); + unsigned page_length = PAGE_SIZE - page_offset; + page_length = remain < page_length ? remain : page_length; + if (drm_mm_node_allocated(&node)) { + ggtt->vm.insert_page(&ggtt->vm, + i915_gem_object_get_dma_address(obj, offset >> PAGE_SHIFT), + node.start, I915_CACHE_NONE, 0); + } else { + page_base += offset & PAGE_MASK; + } + + if (gtt_user_read(&ggtt->iomap, page_base, page_offset, + user_data, page_length)) { + ret = -EFAULT; + break; + } + + remain -= page_length; + user_data += page_length; + offset += page_length; + } + + i915_gem_gtt_cleanup(obj, &node, vma); +out_rpm: + intel_runtime_pm_put(&i915->runtime_pm, wakeref); + return ret; +} + +/** + * Reads data from the object referenced by handle. + * @dev: drm device pointer + * @data: ioctl data blob + * @file: drm file pointer + * + * On error, the contents of *data are undefined. + */ +int +i915_gem_pread_ioctl(struct drm_device *dev, void *data, + struct drm_file *file) +{ + struct drm_i915_private *i915 = to_i915(dev); + struct drm_i915_gem_pread *args = data; + struct drm_i915_gem_object *obj; + int ret; + + /* PREAD is disallowed for all platforms after TGL-LP. This also + * covers all platforms with local memory. + */ + if (GRAPHICS_VER(i915) >= 12 && !IS_TIGERLAKE(i915)) + return -EOPNOTSUPP; + + if (args->size == 0) + return 0; + + if (!access_ok(u64_to_user_ptr(args->data_ptr), + args->size)) + return -EFAULT; + + obj = i915_gem_object_lookup(file, args->handle); + if (!obj) + return -ENOENT; + + /* Bounds check source. */ + if (range_overflows_t(u64, args->offset, args->size, obj->base.size)) { + ret = -EINVAL; + goto out; + } + + trace_i915_gem_object_pread(obj, args->offset, args->size); + ret = -ENODEV; + if (obj->ops->pread) + ret = obj->ops->pread(obj, args); + if (ret != -ENODEV) + goto out; + + ret = i915_gem_object_wait(obj, + I915_WAIT_INTERRUPTIBLE, + MAX_SCHEDULE_TIMEOUT); + if (ret) + goto out; + + ret = i915_gem_shmem_pread(obj, args); + if (ret == -EFAULT || ret == -ENODEV) + ret = i915_gem_gtt_pread(obj, args); + +out: + i915_gem_object_put(obj); + return ret; +} + +/* This is the fast write path which cannot handle + * page faults in the source data + */ + +static inline bool +ggtt_write(struct io_mapping *mapping, + loff_t base, int offset, + char __user *user_data, int length) +{ + void __iomem *vaddr; + unsigned long unwritten; + + /* We can use the cpu mem copy function because this is X86. */ + vaddr = io_mapping_map_atomic_wc(mapping, base); + unwritten = __copy_from_user_inatomic_nocache((void __force *)vaddr + offset, + user_data, length); + io_mapping_unmap_atomic(vaddr); + if (unwritten) { + vaddr = io_mapping_map_wc(mapping, base, PAGE_SIZE); + unwritten = copy_from_user((void __force *)vaddr + offset, + user_data, length); + io_mapping_unmap(vaddr); + } + + return unwritten; +} + +/** + * This is the fast pwrite path, where we copy the data directly from the + * user into the GTT, uncached. + * @obj: i915 GEM object + * @args: pwrite arguments structure + */ +static int +i915_gem_gtt_pwrite_fast(struct drm_i915_gem_object *obj, + const struct drm_i915_gem_pwrite *args) +{ + struct drm_i915_private *i915 = to_i915(obj->base.dev); + struct i915_ggtt *ggtt = to_gt(i915)->ggtt; + struct intel_runtime_pm *rpm = &i915->runtime_pm; + intel_wakeref_t wakeref; + struct drm_mm_node node; + struct i915_vma *vma; + u64 remain, offset; + void __user *user_data; + int ret = 0; + + if (i915_gem_object_has_struct_page(obj)) { + /* + * Avoid waking the device up if we can fallback, as + * waking/resuming is very slow (worst-case 10-100 ms + * depending on PCI sleeps and our own resume time). + * This easily dwarfs any performance advantage from + * using the cache bypass of indirect GGTT access. + */ + wakeref = intel_runtime_pm_get_if_in_use(rpm); + if (!wakeref) + return -EFAULT; + } else { + /* No backing pages, no fallback, we must force GGTT access */ + wakeref = intel_runtime_pm_get(rpm); + } + + vma = i915_gem_gtt_prepare(obj, &node, true); + if (IS_ERR(vma)) { + ret = PTR_ERR(vma); + goto out_rpm; + } + + i915_gem_object_invalidate_frontbuffer(obj, ORIGIN_CPU); + + user_data = u64_to_user_ptr(args->data_ptr); + offset = args->offset; + remain = args->size; + while (remain) { + /* Operation in this page + * + * page_base = page offset within aperture + * page_offset = offset within page + * page_length = bytes to copy for this page + */ + u32 page_base = node.start; + unsigned int page_offset = offset_in_page(offset); + unsigned int page_length = PAGE_SIZE - page_offset; + page_length = remain < page_length ? remain : page_length; + if (drm_mm_node_allocated(&node)) { + /* flush the write before we modify the GGTT */ + intel_gt_flush_ggtt_writes(ggtt->vm.gt); + ggtt->vm.insert_page(&ggtt->vm, + i915_gem_object_get_dma_address(obj, offset >> PAGE_SHIFT), + node.start, I915_CACHE_NONE, 0); + wmb(); /* flush modifications to the GGTT (insert_page) */ + } else { + page_base += offset & PAGE_MASK; + } + /* If we get a fault while copying data, then (presumably) our + * source page isn't available. Return the error and we'll + * retry in the slow path. + * If the object is non-shmem backed, we retry again with the + * path that handles page fault. + */ + if (ggtt_write(&ggtt->iomap, page_base, page_offset, + user_data, page_length)) { + ret = -EFAULT; + break; + } + + remain -= page_length; + user_data += page_length; + offset += page_length; + } + + intel_gt_flush_ggtt_writes(ggtt->vm.gt); + i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU); + + i915_gem_gtt_cleanup(obj, &node, vma); +out_rpm: + intel_runtime_pm_put(rpm, wakeref); + return ret; +} + +/* Per-page copy function for the shmem pwrite fastpath. + * Flushes invalid cachelines before writing to the target if + * needs_clflush_before is set and flushes out any written cachelines after + * writing if needs_clflush is set. + */ +static int +shmem_pwrite(struct page *page, int offset, int len, char __user *user_data, + bool needs_clflush_before, + bool needs_clflush_after) +{ + char *vaddr; + int ret; + + vaddr = kmap(page); + + if (needs_clflush_before) + drm_clflush_virt_range(vaddr + offset, len); + + ret = __copy_from_user(vaddr + offset, user_data, len); + if (!ret && needs_clflush_after) + drm_clflush_virt_range(vaddr + offset, len); + + kunmap(page); + + return ret ? -EFAULT : 0; +} + +static int +i915_gem_shmem_pwrite(struct drm_i915_gem_object *obj, + const struct drm_i915_gem_pwrite *args) +{ + unsigned int partial_cacheline_write; + unsigned int needs_clflush; + unsigned int offset, idx; + void __user *user_data; + u64 remain; + int ret; + + ret = i915_gem_object_lock_interruptible(obj, NULL); + if (ret) + return ret; + + ret = i915_gem_object_pin_pages(obj); + if (ret) + goto err_unlock; + + ret = i915_gem_object_prepare_write(obj, &needs_clflush); + if (ret) + goto err_unpin; + + i915_gem_object_finish_access(obj); + i915_gem_object_unlock(obj); + + /* If we don't overwrite a cacheline completely we need to be + * careful to have up-to-date data by first clflushing. Don't + * overcomplicate things and flush the entire patch. + */ + partial_cacheline_write = 0; + if (needs_clflush & CLFLUSH_BEFORE) + partial_cacheline_write = boot_cpu_data.x86_clflush_size - 1; + + user_data = u64_to_user_ptr(args->data_ptr); + remain = args->size; + offset = offset_in_page(args->offset); + for (idx = args->offset >> PAGE_SHIFT; remain; idx++) { + struct page *page = i915_gem_object_get_page(obj, idx); + unsigned int length = min_t(u64, remain, PAGE_SIZE - offset); + + ret = shmem_pwrite(page, offset, length, user_data, + (offset | length) & partial_cacheline_write, + needs_clflush & CLFLUSH_AFTER); + if (ret) + break; + + remain -= length; + user_data += length; + offset = 0; + } + + i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU); + + i915_gem_object_unpin_pages(obj); + return ret; + +err_unpin: + i915_gem_object_unpin_pages(obj); +err_unlock: + i915_gem_object_unlock(obj); + return ret; +} + +/** + * Writes data to the object referenced by handle. + * @dev: drm device + * @data: ioctl data blob + * @file: drm file + * + * On error, the contents of the buffer that were to be modified are undefined. + */ +int +i915_gem_pwrite_ioctl(struct drm_device *dev, void *data, + struct drm_file *file) +{ + struct drm_i915_private *i915 = to_i915(dev); + struct drm_i915_gem_pwrite *args = data; + struct drm_i915_gem_object *obj; + int ret; + + /* PWRITE is disallowed for all platforms after TGL-LP. This also + * covers all platforms with local memory. + */ + if (GRAPHICS_VER(i915) >= 12 && !IS_TIGERLAKE(i915)) + return -EOPNOTSUPP; + + if (args->size == 0) + return 0; + + if (!access_ok(u64_to_user_ptr(args->data_ptr), args->size)) + return -EFAULT; + + obj = i915_gem_object_lookup(file, args->handle); + if (!obj) + return -ENOENT; + + /* Bounds check destination. */ + if (range_overflows_t(u64, args->offset, args->size, obj->base.size)) { + ret = -EINVAL; + goto err; + } + + /* Writes not allowed into this read-only object */ + if (i915_gem_object_is_readonly(obj)) { + ret = -EINVAL; + goto err; + } + + trace_i915_gem_object_pwrite(obj, args->offset, args->size); + + ret = -ENODEV; + if (obj->ops->pwrite) + ret = obj->ops->pwrite(obj, args); + if (ret != -ENODEV) + goto err; + + ret = i915_gem_object_wait(obj, + I915_WAIT_INTERRUPTIBLE | + I915_WAIT_ALL, + MAX_SCHEDULE_TIMEOUT); + if (ret) + goto err; + + ret = -EFAULT; + /* We can only do the GTT pwrite on untiled buffers, as otherwise + * it would end up going through the fenced access, and we'll get + * different detiling behavior between reading and writing. + * pread/pwrite currently are reading and writing from the CPU + * perspective, requiring manual detiling by the client. + */ + if (!i915_gem_object_has_struct_page(obj) || + i915_gem_cpu_write_needs_clflush(obj)) + /* 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. + */ + ret = i915_gem_gtt_pwrite_fast(obj, args); + + if (ret == -EFAULT || ret == -ENOSPC) { + if (i915_gem_object_has_struct_page(obj)) + ret = i915_gem_shmem_pwrite(obj, args); + } + +err: + i915_gem_object_put(obj); + return ret; +} + +/** + * Called when user space has done writes to this buffer + * @dev: drm device + * @data: ioctl data blob + * @file: drm file + */ +int +i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data, + struct drm_file *file) +{ + struct drm_i915_gem_sw_finish *args = data; + struct drm_i915_gem_object *obj; + + obj = i915_gem_object_lookup(file, args->handle); + if (!obj) + return -ENOENT; + + /* + * Proxy objects are barred from CPU access, so there is no + * need to ban sw_finish as it is a nop. + */ + + /* Pinned buffers may be scanout, so flush the cache */ + i915_gem_object_flush_if_display(obj); + i915_gem_object_put(obj); + + return 0; +} + +void i915_gem_runtime_suspend(struct drm_i915_private *i915) +{ + struct drm_i915_gem_object *obj, *on; + int i; + + /* + * Only called during RPM suspend. All users of the userfault_list + * must be holding an RPM wakeref to ensure that this can not + * run concurrently with themselves (and use the struct_mutex for + * protection between themselves). + */ + + list_for_each_entry_safe(obj, on, + &to_gt(i915)->ggtt->userfault_list, userfault_link) + __i915_gem_object_release_mmap_gtt(obj); + + list_for_each_entry_safe(obj, on, + &i915->runtime_pm.lmem_userfault_list, userfault_link) + i915_gem_object_runtime_pm_release_mmap_offset(obj); + + /* + * The fence will be lost when the device powers down. If any were + * in use by hardware (i.e. they are pinned), we should not be powering + * down! All other fences will be reacquired by the user upon waking. + */ + for (i = 0; i < to_gt(i915)->ggtt->num_fences; i++) { + struct i915_fence_reg *reg = &to_gt(i915)->ggtt->fence_regs[i]; + + /* + * Ideally we want to assert that the fence register is not + * live at this point (i.e. that no piece of code will be + * trying to write through fence + GTT, as that both violates + * our tracking of activity and associated locking/barriers, + * but also is illegal given that the hw is powered down). + * + * Previously we used reg->pin_count as a "liveness" indicator. + * That is not sufficient, and we need a more fine-grained + * tool if we want to have a sanity check here. + */ + + if (!reg->vma) + continue; + + GEM_BUG_ON(i915_vma_has_userfault(reg->vma)); + reg->dirty = true; + } +} + +static void discard_ggtt_vma(struct i915_vma *vma) +{ + struct drm_i915_gem_object *obj = vma->obj; + + spin_lock(&obj->vma.lock); + if (!RB_EMPTY_NODE(&vma->obj_node)) { + rb_erase(&vma->obj_node, &obj->vma.tree); + RB_CLEAR_NODE(&vma->obj_node); + } + spin_unlock(&obj->vma.lock); +} + +struct i915_vma * +i915_gem_object_ggtt_pin_ww(struct drm_i915_gem_object *obj, + struct i915_gem_ww_ctx *ww, + const struct i915_gtt_view *view, + u64 size, u64 alignment, u64 flags) +{ + struct drm_i915_private *i915 = to_i915(obj->base.dev); + struct i915_ggtt *ggtt = to_gt(i915)->ggtt; + struct i915_vma *vma; + int ret; + + GEM_WARN_ON(!ww); + + if (flags & PIN_MAPPABLE && + (!view || view->type == I915_GTT_VIEW_NORMAL)) { + /* + * If the required space is larger than the available + * aperture, we will not able to find a slot for the + * object and unbinding the object now will be in + * vain. Worse, doing so may cause us to ping-pong + * the object in and out of the Global GTT and + * waste a lot of cycles under the mutex. + */ + if (obj->base.size > ggtt->mappable_end) + return ERR_PTR(-E2BIG); + + /* + * If NONBLOCK is set the caller is optimistically + * trying to cache the full object within the mappable + * aperture, and *must* have a fallback in place for + * situations where we cannot bind the object. We + * can be a little more lax here and use the fallback + * more often to avoid costly migrations of ourselves + * and other objects within the aperture. + * + * Half-the-aperture is used as a simple heuristic. + * More interesting would to do search for a free + * block prior to making the commitment to unbind. + * That caters for the self-harm case, and with a + * little more heuristics (e.g. NOFAULT, NOEVICT) + * we could try to minimise harm to others. + */ + if (flags & PIN_NONBLOCK && + obj->base.size > ggtt->mappable_end / 2) + return ERR_PTR(-ENOSPC); + } + +new_vma: + vma = i915_vma_instance(obj, &ggtt->vm, view); + if (IS_ERR(vma)) + return vma; + + if (i915_vma_misplaced(vma, size, alignment, flags)) { + if (flags & PIN_NONBLOCK) { + if (i915_vma_is_pinned(vma) || i915_vma_is_active(vma)) + return ERR_PTR(-ENOSPC); + + /* + * If this misplaced vma is too big (i.e, at-least + * half the size of aperture) or hasn't been pinned + * mappable before, we ignore the misplacement when + * PIN_NONBLOCK is set in order to avoid the ping-pong + * issue described above. In other words, we try to + * avoid the costly operation of unbinding this vma + * from the GGTT and rebinding it back because there + * may not be enough space for this vma in the aperture. + */ + if (flags & PIN_MAPPABLE && + (vma->fence_size > ggtt->mappable_end / 2 || + !i915_vma_is_map_and_fenceable(vma))) + return ERR_PTR(-ENOSPC); + } + + if (i915_vma_is_pinned(vma) || i915_vma_is_active(vma)) { + discard_ggtt_vma(vma); + goto new_vma; + } + + ret = i915_vma_unbind(vma); + if (ret) + return ERR_PTR(ret); + } + + ret = i915_vma_pin_ww(vma, ww, size, alignment, flags | PIN_GLOBAL); + + if (ret) + return ERR_PTR(ret); + + if (vma->fence && !i915_gem_object_is_tiled(obj)) { + mutex_lock(&ggtt->vm.mutex); + i915_vma_revoke_fence(vma); + mutex_unlock(&ggtt->vm.mutex); + } + + ret = i915_vma_wait_for_bind(vma); + if (ret) { + i915_vma_unpin(vma); + return ERR_PTR(ret); + } + + return vma; +} + +struct i915_vma * __must_check +i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj, + const struct i915_gtt_view *view, + u64 size, u64 alignment, u64 flags) +{ + struct i915_gem_ww_ctx ww; + struct i915_vma *ret; + int err; + + for_i915_gem_ww(&ww, err, true) { + err = i915_gem_object_lock(obj, &ww); + if (err) + continue; + + ret = i915_gem_object_ggtt_pin_ww(obj, &ww, view, size, + alignment, flags); + if (IS_ERR(ret)) + err = PTR_ERR(ret); + } + + return err ? ERR_PTR(err) : ret; +} + +int +i915_gem_madvise_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_priv) +{ + struct drm_i915_private *i915 = to_i915(dev); + struct drm_i915_gem_madvise *args = data; + struct drm_i915_gem_object *obj; + int err; + + switch (args->madv) { + case I915_MADV_DONTNEED: + case I915_MADV_WILLNEED: + break; + default: + return -EINVAL; + } + + obj = i915_gem_object_lookup(file_priv, args->handle); + if (!obj) + return -ENOENT; + + err = i915_gem_object_lock_interruptible(obj, NULL); + if (err) + goto out; + + if (i915_gem_object_has_pages(obj) && + i915_gem_object_is_tiled(obj) && + i915->gem_quirks & GEM_QUIRK_PIN_SWIZZLED_PAGES) { + if (obj->mm.madv == I915_MADV_WILLNEED) { + GEM_BUG_ON(!i915_gem_object_has_tiling_quirk(obj)); + i915_gem_object_clear_tiling_quirk(obj); + i915_gem_object_make_shrinkable(obj); + } + if (args->madv == I915_MADV_WILLNEED) { + GEM_BUG_ON(i915_gem_object_has_tiling_quirk(obj)); + i915_gem_object_make_unshrinkable(obj); + i915_gem_object_set_tiling_quirk(obj); + } + } + + if (obj->mm.madv != __I915_MADV_PURGED) { + obj->mm.madv = args->madv; + if (obj->ops->adjust_lru) + obj->ops->adjust_lru(obj); + } + + if (i915_gem_object_has_pages(obj) || + i915_gem_object_has_self_managed_shrink_list(obj)) { + unsigned long flags; + + spin_lock_irqsave(&i915->mm.obj_lock, flags); + if (!list_empty(&obj->mm.link)) { + struct list_head *list; + + if (obj->mm.madv != I915_MADV_WILLNEED) + list = &i915->mm.purge_list; + else + list = &i915->mm.shrink_list; + list_move_tail(&obj->mm.link, list); + + } + spin_unlock_irqrestore(&i915->mm.obj_lock, flags); + } + + /* if the object is no longer attached, discard its backing storage */ + if (obj->mm.madv == I915_MADV_DONTNEED && + !i915_gem_object_has_pages(obj)) + i915_gem_object_truncate(obj); + + args->retained = obj->mm.madv != __I915_MADV_PURGED; + + i915_gem_object_unlock(obj); +out: + i915_gem_object_put(obj); + return err; +} + +/* + * A single pass should suffice to release all the freed objects (along most + * call paths), but be a little more paranoid in that freeing the objects does + * take a little amount of time, during which the rcu callbacks could have added + * new objects into the freed list, and armed the work again. + */ +void i915_gem_drain_freed_objects(struct drm_i915_private *i915) +{ + while (atomic_read(&i915->mm.free_count)) { + flush_work(&i915->mm.free_work); + flush_delayed_work(&i915->bdev.wq); + rcu_barrier(); + } +} + +/* + * Similar to objects above (see i915_gem_drain_freed-objects), in general we + * have workers that are armed by RCU and then rearm themselves in their + * callbacks. To be paranoid, we need to drain the workqueue a second time after + * waiting for the RCU grace period so that we catch work queued via RCU from + * the first pass. As neither drain_workqueue() nor flush_workqueue() report a + * result, we make an assumption that we only don't require more than 3 passes + * to catch all _recursive_ RCU delayed work. + */ +void i915_gem_drain_workqueue(struct drm_i915_private *i915) +{ + int i; + + for (i = 0; i < 3; i++) { + flush_workqueue(i915->wq); + rcu_barrier(); + i915_gem_drain_freed_objects(i915); + } + + drain_workqueue(i915->wq); +} + +int i915_gem_init(struct drm_i915_private *dev_priv) +{ + struct intel_gt *gt; + unsigned int i; + int ret; + + /* We need to fallback to 4K pages if host doesn't support huge gtt. */ + if (intel_vgpu_active(dev_priv) && !intel_vgpu_has_huge_gtt(dev_priv)) + RUNTIME_INFO(dev_priv)->page_sizes = I915_GTT_PAGE_SIZE_4K; + + ret = i915_gem_init_userptr(dev_priv); + if (ret) + return ret; + + intel_uc_fetch_firmwares(&to_gt(dev_priv)->uc); + intel_wopcm_init(&dev_priv->wopcm); + + ret = i915_init_ggtt(dev_priv); + if (ret) { + GEM_BUG_ON(ret == -EIO); + goto err_unlock; + } + + /* + * Despite its name intel_init_clock_gating applies both display + * clock gating workarounds; GT mmio workarounds and the occasional + * GT power context workaround. Worse, sometimes it includes a context + * register workaround which we need to apply before we record the + * default HW state for all contexts. + * + * FIXME: break up the workarounds and apply them at the right time! + */ + intel_init_clock_gating(dev_priv); + + for_each_gt(gt, dev_priv, i) { + ret = intel_gt_init(gt); + if (ret) + goto err_unlock; + } + + return 0; + + /* + * Unwinding is complicated by that we want to handle -EIO to mean + * disable GPU submission but keep KMS alive. We want to mark the + * HW as irrevisibly wedged, but keep enough state around that the + * driver doesn't explode during runtime. + */ +err_unlock: + i915_gem_drain_workqueue(dev_priv); + + if (ret != -EIO) { + for_each_gt(gt, dev_priv, i) { + intel_gt_driver_remove(gt); + intel_gt_driver_release(gt); + intel_uc_cleanup_firmwares(>->uc); + } + } + + if (ret == -EIO) { + /* + * Allow engines or uC initialisation to fail by marking the GPU + * as wedged. But we only want to do this when the GPU is angry, + * for all other failure, such as an allocation failure, bail. + */ + for_each_gt(gt, dev_priv, i) { + if (!intel_gt_is_wedged(gt)) { + i915_probe_error(dev_priv, + "Failed to initialize GPU, declaring it wedged!\n"); + intel_gt_set_wedged(gt); + } + } + + /* Minimal basic recovery for KMS */ + ret = i915_ggtt_enable_hw(dev_priv); + i915_ggtt_resume(to_gt(dev_priv)->ggtt); + intel_init_clock_gating(dev_priv); + } + + i915_gem_drain_freed_objects(dev_priv); + + return ret; +} + +void i915_gem_driver_register(struct drm_i915_private *i915) +{ + i915_gem_driver_register__shrinker(i915); + + intel_engines_driver_register(i915); +} + +void i915_gem_driver_unregister(struct drm_i915_private *i915) +{ + i915_gem_driver_unregister__shrinker(i915); +} + +void i915_gem_driver_remove(struct drm_i915_private *dev_priv) +{ + struct intel_gt *gt; + unsigned int i; + + i915_gem_suspend_late(dev_priv); + for_each_gt(gt, dev_priv, i) + intel_gt_driver_remove(gt); + dev_priv->uabi_engines = RB_ROOT; + + /* Flush any outstanding unpin_work. */ + i915_gem_drain_workqueue(dev_priv); + + i915_gem_drain_freed_objects(dev_priv); +} + +void i915_gem_driver_release(struct drm_i915_private *dev_priv) +{ + struct intel_gt *gt; + unsigned int i; + + for_each_gt(gt, dev_priv, i) { + intel_gt_driver_release(gt); + intel_uc_cleanup_firmwares(>->uc); + } + + /* Flush any outstanding work, including i915_gem_context.release_work. */ + i915_gem_drain_workqueue(dev_priv); + + drm_WARN_ON(&dev_priv->drm, !list_empty(&dev_priv->gem.contexts.list)); +} + +static void i915_gem_init__mm(struct drm_i915_private *i915) +{ + spin_lock_init(&i915->mm.obj_lock); + + init_llist_head(&i915->mm.free_list); + + INIT_LIST_HEAD(&i915->mm.purge_list); + INIT_LIST_HEAD(&i915->mm.shrink_list); + + i915_gem_init__objects(i915); +} + +void i915_gem_init_early(struct drm_i915_private *dev_priv) +{ + i915_gem_init__mm(dev_priv); + i915_gem_init__contexts(dev_priv); + + spin_lock_init(&dev_priv->display.fb_tracking.lock); +} + +void i915_gem_cleanup_early(struct drm_i915_private *dev_priv) +{ + i915_gem_drain_freed_objects(dev_priv); + GEM_BUG_ON(!llist_empty(&dev_priv->mm.free_list)); + GEM_BUG_ON(atomic_read(&dev_priv->mm.free_count)); + drm_WARN_ON(&dev_priv->drm, dev_priv->mm.shrink_count); +} + +int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file) +{ + struct drm_i915_file_private *file_priv; + struct i915_drm_client *client; + int ret = -ENOMEM; + + DRM_DEBUG("\n"); + + file_priv = kzalloc(sizeof(*file_priv), GFP_KERNEL); + if (!file_priv) + goto err_alloc; + + client = i915_drm_client_add(&i915->clients); + if (IS_ERR(client)) { + ret = PTR_ERR(client); + goto err_client; + } + + file->driver_priv = file_priv; + file_priv->dev_priv = i915; + file_priv->file = file; + file_priv->client = client; + + file_priv->bsd_engine = -1; + file_priv->hang_timestamp = jiffies; + + ret = i915_gem_context_open(i915, file); + if (ret) + goto err_context; + + return 0; + +err_context: + i915_drm_client_put(client); +err_client: + kfree(file_priv); +err_alloc: + return ret; +} + +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) +#include "selftests/mock_gem_device.c" +#include "selftests/i915_gem.c" +#endif |