drm/i915: Move mmap and friends to its own file

Continuing the decluttering of i915_gem.c, now the turn of do_mmap and
the faulthandlers
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190528092956.14910-6-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/Makefile

@@ -88,6 +88,7 @@ i915-y += $(gt-y)
 obj-y += gem/
 gem-y += \
 	gem/i915_gem_object.o \
+	gem/i915_gem_mman.o \
 	gem/i915_gem_pages.o \
 	gem/i915_gem_phys.o \
 	gem/i915_gem_shmem.o

drivers/gpu/drm/i915/gem/i915_gem_mman.c

+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2014-2016 Intel Corporation
+ */
+
+#include <linux/mman.h>
+#include <linux/sizes.h>
+
+#include "i915_drv.h"
+#include "i915_gem_gtt.h"
+#include "i915_gem_ioctls.h"
+#include "i915_gem_object.h"
+#include "i915_vma.h"
+#include "intel_drv.h"
+
+static inline bool
+__vma_matches(struct vm_area_struct *vma, struct file *filp,
+	      unsigned long addr, unsigned long size)
+{
+	if (vma->vm_file != filp)
+		return false;
+
+	return vma->vm_start == addr &&
+	       (vma->vm_end - vma->vm_start) == PAGE_ALIGN(size);
+}
+
+/**
+ * i915_gem_mmap_ioctl - Maps the contents of an object, returning the address
+ *			 it is mapped to.
+ * @dev: drm device
+ * @data: ioctl data blob
+ * @file: drm file
+ *
+ * While the mapping holds a reference on the contents of the object, it doesn't
+ * imply a ref on the object itself.
+ *
+ * IMPORTANT:
+ *
+ * DRM driver writers who look a this function as an example for how to do GEM
+ * mmap support, please don't implement mmap support like here. The modern way
+ * to implement DRM mmap support is with an mmap offset ioctl (like
+ * i915_gem_mmap_gtt) and then using the mmap syscall on the DRM fd directly.
+ * That way debug tooling like valgrind will understand what's going on, hiding
+ * the mmap call in a driver private ioctl will break that. The i915 driver only
+ * does cpu mmaps this way because we didn't know better.
+ */
+int
+i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
+		    struct drm_file *file)
+{
+	struct drm_i915_gem_mmap *args = data;
+	struct drm_i915_gem_object *obj;
+	unsigned long addr;
+
+	if (args->flags & ~(I915_MMAP_WC))
+		return -EINVAL;
+
+	if (args->flags & I915_MMAP_WC && !boot_cpu_has(X86_FEATURE_PAT))
+		return -ENODEV;
+
+	obj = i915_gem_object_lookup(file, args->handle);
+	if (!obj)
+		return -ENOENT;
+
+	/* prime objects have no backing filp to GEM mmap
+	 * pages from.
+	 */
+	if (!obj->base.filp) {
+		addr = -ENXIO;
+		goto err;
+	}
+
+	if (range_overflows(args->offset, args->size, (u64)obj->base.size)) {
+		addr = -EINVAL;
+		goto err;
+	}
+
+	addr = vm_mmap(obj->base.filp, 0, args->size,
+		       PROT_READ | PROT_WRITE, MAP_SHARED,
+		       args->offset);
+	if (IS_ERR_VALUE(addr))
+		goto err;
+
+	if (args->flags & I915_MMAP_WC) {
+		struct mm_struct *mm = current->mm;
+		struct vm_area_struct *vma;
+
+		if (down_write_killable(&mm->mmap_sem)) {
+			addr = -EINTR;
+			goto err;
+		}
+		vma = find_vma(mm, addr);
+		if (vma && __vma_matches(vma, obj->base.filp, addr, args->size))
+			vma->vm_page_prot =
+				pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
+		else
+			addr = -ENOMEM;
+		up_write(&mm->mmap_sem);
+		if (IS_ERR_VALUE(addr))
+			goto err;
+
+		/* This may race, but that's ok, it only gets set */
+		WRITE_ONCE(obj->frontbuffer_ggtt_origin, ORIGIN_CPU);
+	}
+	i915_gem_object_put(obj);
+
+	args->addr_ptr = (u64)addr;
+	return 0;
+
+err:
+	i915_gem_object_put(obj);
+	return addr;
+}
+
+static unsigned int tile_row_pages(const struct drm_i915_gem_object *obj)
+{
+	return i915_gem_object_get_tile_row_size(obj) >> PAGE_SHIFT;
+}
+
+/**
+ * i915_gem_mmap_gtt_version - report the current feature set for GTT mmaps
+ *
+ * A history of the GTT mmap interface:
+ *
+ * 0 - Everything had to fit into the GTT. Both parties of a memcpy had to
+ *     aligned and suitable for fencing, and still fit into the available
+ *     mappable space left by the pinned display objects. A classic problem
+ *     we called the page-fault-of-doom where we would ping-pong between
+ *     two objects that could not fit inside the GTT and so the memcpy
+ *     would page one object in at the expense of the other between every
+ *     single byte.
+ *
+ * 1 - Objects can be any size, and have any compatible fencing (X Y, or none
+ *     as set via i915_gem_set_tiling() [DRM_I915_GEM_SET_TILING]). If the
+ *     object is too large for the available space (or simply too large
+ *     for the mappable aperture!), a view is created instead and faulted
+ *     into userspace. (This view is aligned and sized appropriately for
+ *     fenced access.)
+ *
+ * 2 - Recognise WC as a separate cache domain so that we can flush the
+ *     delayed writes via GTT before performing direct access via WC.
+ *
+ * 3 - Remove implicit set-domain(GTT) and synchronisation on initial
+ *     pagefault; swapin remains transparent.
+ *
+ * Restrictions:
+ *
+ *  * snoopable objects cannot be accessed via the GTT. It can cause machine
+ *    hangs on some architectures, corruption on others. An attempt to service
+ *    a GTT page fault from a snoopable object will generate a SIGBUS.
+ *
+ *  * the object must be able to fit into RAM (physical memory, though no
+ *    limited to the mappable aperture).
+ *
+ *
+ * Caveats:
+ *
+ *  * a new GTT page fault will synchronize rendering from the GPU and flush
+ *    all data to system memory. Subsequent access will not be synchronized.
+ *
+ *  * all mappings are revoked on runtime device suspend.
+ *
+ *  * there are only 8, 16 or 32 fence registers to share between all users
+ *    (older machines require fence register for display and blitter access
+ *    as well). Contention of the fence registers will cause the previous users
+ *    to be unmapped and any new access will generate new page faults.
+ *
+ *  * running out of memory while servicing a fault may generate a SIGBUS,
+ *    rather than the expected SIGSEGV.
+ */
+int i915_gem_mmap_gtt_version(void)
+{
+	return 3;
+}
+
+static inline struct i915_ggtt_view
+compute_partial_view(const struct drm_i915_gem_object *obj,
+		     pgoff_t page_offset,
+		     unsigned int chunk)
+{
+	struct i915_ggtt_view view;
+
+	if (i915_gem_object_is_tiled(obj))
+		chunk = roundup(chunk, tile_row_pages(obj));
+
+	view.type = I915_GGTT_VIEW_PARTIAL;
+	view.partial.offset = rounddown(page_offset, chunk);
+	view.partial.size =
+		min_t(unsigned int, chunk,
+		      (obj->base.size >> PAGE_SHIFT) - view.partial.offset);
+
+	/* If the partial covers the entire object, just create a normal VMA. */
+	if (chunk >= obj->base.size >> PAGE_SHIFT)
+		view.type = I915_GGTT_VIEW_NORMAL;
+
+	return view;
+}
+
+/**
+ * i915_gem_fault - fault a page into the GTT
+ * @vmf: fault info
+ *
+ * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
+ * from userspace.  The fault handler takes care of binding the object to
+ * the GTT (if needed), allocating and programming a fence register (again,
+ * only if needed based on whether the old reg is still valid or the object
+ * is tiled) and inserting a new PTE into the faulting process.
+ *
+ * Note that the faulting process may involve evicting existing objects
+ * from the GTT and/or fence registers to make room.  So performance may
+ * suffer if the GTT working set is large or there are few fence registers
+ * left.
+ *
+ * The current feature set supported by i915_gem_fault() and thus GTT mmaps
+ * is exposed via I915_PARAM_MMAP_GTT_VERSION (see i915_gem_mmap_gtt_version).
+ */
+vm_fault_t i915_gem_fault(struct vm_fault *vmf)
+{
+#define MIN_CHUNK_PAGES (SZ_1M >> PAGE_SHIFT)
+	struct vm_area_struct *area = vmf->vma;
+	struct drm_i915_gem_object *obj = to_intel_bo(area->vm_private_data);
+	struct drm_device *dev = obj->base.dev;
+	struct drm_i915_private *i915 = to_i915(dev);
+	struct i915_ggtt *ggtt = &i915->ggtt;
+	bool write = area->vm_flags & VM_WRITE;
+	intel_wakeref_t wakeref;
+	struct i915_vma *vma;
+	pgoff_t page_offset;
+	int srcu;
+	int ret;
+
+	/* Sanity check that we allow writing into this object */
+	if (i915_gem_object_is_readonly(obj) && write)
+		return VM_FAULT_SIGBUS;
+
+	/* We don't use vmf->pgoff since that has the fake offset */
+	page_offset = (vmf->address - area->vm_start) >> PAGE_SHIFT;
+
+	trace_i915_gem_object_fault(obj, page_offset, true, write);
+
+	ret = i915_gem_object_pin_pages(obj);
+	if (ret)
+		goto err;
+
+	wakeref = intel_runtime_pm_get(i915);
+
+	srcu = i915_reset_trylock(i915);
+	if (srcu < 0) {
+		ret = srcu;
+		goto err_rpm;
+	}
+
+	ret = i915_mutex_lock_interruptible(dev);
+	if (ret)
+		goto err_reset;
+
+	/* Access to snoopable pages through the GTT is incoherent. */
+	if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(i915)) {
+		ret = -EFAULT;
+		goto err_unlock;
+	}
+
+	/* Now pin it into the GTT as needed */
+	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
+				       PIN_MAPPABLE |
+				       PIN_NONBLOCK |
+				       PIN_NONFAULT);
+	if (IS_ERR(vma)) {
+		/* Use a partial view if it is bigger than available space */
+		struct i915_ggtt_view view =
+			compute_partial_view(obj, page_offset, MIN_CHUNK_PAGES);
+		unsigned int flags;
+
+		flags = PIN_MAPPABLE;
+		if (view.type == I915_GGTT_VIEW_NORMAL)
+			flags |= PIN_NONBLOCK; /* avoid warnings for pinned */
+
+		/*
+		 * Userspace is now writing through an untracked VMA, abandon
+		 * all hope that the hardware is able to track future writes.
+		 */
+		obj->frontbuffer_ggtt_origin = ORIGIN_CPU;
+
+		vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);
+		if (IS_ERR(vma) && !view.type) {
+			flags = PIN_MAPPABLE;
+			view.type = I915_GGTT_VIEW_PARTIAL;
+			vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);
+		}
+	}
+	if (IS_ERR(vma)) {
+		ret = PTR_ERR(vma);
+		goto err_unlock;
+	}
+
+	ret = i915_vma_pin_fence(vma);
+	if (ret)
+		goto err_unpin;
+
+	/* Finally, remap it using the new GTT offset */
+	ret = remap_io_mapping(area,
+			       area->vm_start + (vma->ggtt_view.partial.offset << PAGE_SHIFT),
+			       (ggtt->gmadr.start + vma->node.start) >> PAGE_SHIFT,
+			       min_t(u64, vma->size, area->vm_end - area->vm_start),
+			       &ggtt->iomap);
+	if (ret)
+		goto err_fence;
+
+	/* Mark as being mmapped into userspace for later revocation */
+	assert_rpm_wakelock_held(i915);
+	if (!i915_vma_set_userfault(vma) && !obj->userfault_count++)
+		list_add(&obj->userfault_link, &i915->mm.userfault_list);
+	if (CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND)
+		intel_wakeref_auto(&i915->mm.userfault_wakeref,
+				   msecs_to_jiffies_timeout(CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND));
+	GEM_BUG_ON(!obj->userfault_count);
+
+	i915_vma_set_ggtt_write(vma);
+
+err_fence:
+	i915_vma_unpin_fence(vma);
+err_unpin:
+	__i915_vma_unpin(vma);
+err_unlock:
+	mutex_unlock(&dev->struct_mutex);
+err_reset:
+	i915_reset_unlock(i915, srcu);
+err_rpm:
+	intel_runtime_pm_put(i915, wakeref);
+	i915_gem_object_unpin_pages(obj);
+err:
+	switch (ret) {
+	case -EIO:
+		/*
+		 * We eat errors when the gpu is terminally wedged to avoid
+		 * userspace unduly crashing (gl has no provisions for mmaps to
+		 * fail). But any other -EIO isn't ours (e.g. swap in failure)
+		 * and so needs to be reported.
+		 */
+		if (!i915_terminally_wedged(i915))
+			return VM_FAULT_SIGBUS;
+		/* else: fall through */
+	case -EAGAIN:
+		/*
+		 * EAGAIN means the gpu is hung and we'll wait for the error
+		 * handler to reset everything when re-faulting in
+		 * i915_mutex_lock_interruptible.
+		 */
+	case 0:
+	case -ERESTARTSYS:
+	case -EINTR:
+	case -EBUSY:
+		/*
+		 * EBUSY is ok: this just means that another thread
+		 * already did the job.
+		 */
+		return VM_FAULT_NOPAGE;
+	case -ENOMEM:
+		return VM_FAULT_OOM;
+	case -ENOSPC:
+	case -EFAULT:
+		return VM_FAULT_SIGBUS;
+	default:
+		WARN_ONCE(ret, "unhandled error in %s: %i\n", __func__, ret);
+		return VM_FAULT_SIGBUS;
+	}
+}
+
+void __i915_gem_object_release_mmap(struct drm_i915_gem_object *obj)
+{
+	struct i915_vma *vma;
+
+	GEM_BUG_ON(!obj->userfault_count);
+
+	obj->userfault_count = 0;
+	list_del(&obj->userfault_link);
+	drm_vma_node_unmap(&obj->base.vma_node,
+			   obj->base.dev->anon_inode->i_mapping);
+
+	for_each_ggtt_vma(vma, obj)
+		i915_vma_unset_userfault(vma);
+}
+
+/**
+ * i915_gem_object_release_mmap - remove physical page mappings
+ * @obj: obj in question
+ *
+ * Preserve the reservation of the mmapping with the DRM core code, but
+ * relinquish ownership of the pages back to the system.
+ *
+ * It is vital that we remove the page mapping if we have mapped a tiled
+ * object through the GTT and then lose the fence register due to
+ * resource pressure. Similarly if the object has been moved out of the
+ * aperture, than pages mapped into userspace must be revoked. Removing the
+ * mapping will then trigger a page fault on the next user access, allowing
+ * fixup by i915_gem_fault().
+ */
+void i915_gem_object_release_mmap(struct drm_i915_gem_object *obj)
+{
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	intel_wakeref_t wakeref;
+
+	/* 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.
+	 */
+	lockdep_assert_held(&i915->drm.struct_mutex);
+	wakeref = intel_runtime_pm_get(i915);
+
+	if (!obj->userfault_count)
+		goto out;
+
+	__i915_gem_object_release_mmap(obj);
+
+	/* Ensure that the CPU's PTE are revoked and there are not outstanding
+	 * memory transactions from userspace before we return. The TLB
+	 * flushing implied above by changing the PTE above *should* be
+	 * sufficient, an extra barrier here just provides us with a bit
+	 * of paranoid documentation about our requirement to serialise
+	 * memory writes before touching registers / GSM.
+	 */
+	wmb();
+
+out:
+	intel_runtime_pm_put(i915, wakeref);
+}
+
+static int create_mmap_offset(struct drm_i915_gem_object *obj)
+{
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	int err;
+
+	err = drm_gem_create_mmap_offset(&obj->base);
+	if (likely(!err))
+		return 0;
+
+	/* Attempt to reap some mmap space from dead objects */
+	do {
+		err = i915_gem_wait_for_idle(i915,
+					     I915_WAIT_INTERRUPTIBLE,
+					     MAX_SCHEDULE_TIMEOUT);
+		if (err)
+			break;
+
+		i915_gem_drain_freed_objects(i915);
+		err = drm_gem_create_mmap_offset(&obj->base);
+		if (!err)
+			break;
+
+	} while (flush_delayed_work(&i915->gem.retire_work));
+
+	return err;
+}
+
+int
+i915_gem_mmap_gtt(struct drm_file *file,
+		  struct drm_device *dev,
+		  u32 handle,
+		  u64 *offset)
+{
+	struct drm_i915_gem_object *obj;
+	int ret;
+
+	obj = i915_gem_object_lookup(file, handle);
+	if (!obj)
+		return -ENOENT;
+
+	ret = create_mmap_offset(obj);
+	if (ret == 0)
+		*offset = drm_vma_node_offset_addr(&obj->base.vma_node);
+
+	i915_gem_object_put(obj);
+	return ret;
+}
+
+/**
+ * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
+ * @dev: DRM device
+ * @data: GTT mapping ioctl data
+ * @file: GEM object info
+ *
+ * Simply returns the fake offset to userspace so it can mmap it.
+ * The mmap call will end up in drm_gem_mmap(), which will set things
+ * up so we can get faults in the handler above.
+ *
+ * The fault handler will take care of binding the object into the GTT
+ * (since it may have been evicted to make room for something), allocating
+ * a fence register, and mapping the appropriate aperture address into
+ * userspace.
+ */
+int
+i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
+			struct drm_file *file)
+{
+	struct drm_i915_gem_mmap_gtt *args = data;
+
+	return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftests/i915_gem_mman.c"
+#endif

drivers/gpu/drm/i915/gem/i915_gem_object.c

@@ -24,6 +24,7 @@
 
 #include "i915_drv.h"
 #include "i915_gem_object.h"
+#include "i915_gem_clflush.h"
 #include "i915_globals.h"
 #include "intel_frontbuffer.h"
 
@@ -356,6 +357,61 @@ void __i915_gem_object_release_unless_active(struct drm_i915_gem_object *obj)
 		i915_gem_object_put(obj);
 }
 
+static inline enum fb_op_origin
+fb_write_origin(struct drm_i915_gem_object *obj, unsigned int domain)
+{
+	return (domain == I915_GEM_DOMAIN_GTT ?
+		obj->frontbuffer_ggtt_origin : ORIGIN_CPU);
+}
+
+static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
+{
+	return !(obj->cache_level == I915_CACHE_NONE ||
+		 obj->cache_level == I915_CACHE_WT);
+}
+
+void
+i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
+				   unsigned int flush_domains)
+{
+	struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
+	struct i915_vma *vma;
+
+	if (!(obj->write_domain & flush_domains))
+		return;
+
+	switch (obj->write_domain) {
+	case I915_GEM_DOMAIN_GTT:
+		i915_gem_flush_ggtt_writes(dev_priv);
+
+		intel_fb_obj_flush(obj,
+				   fb_write_origin(obj, I915_GEM_DOMAIN_GTT));
+
+		for_each_ggtt_vma(vma, obj) {
+			if (vma->iomap)
+				continue;
+
+			i915_vma_unset_ggtt_write(vma);
+		}
+		break;
+
+	case I915_GEM_DOMAIN_WC:
+		wmb();
+		break;
+
+	case I915_GEM_DOMAIN_CPU:
+		i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
+		break;
+
+	case I915_GEM_DOMAIN_RENDER:
+		if (gpu_write_needs_clflush(obj))
+			obj->cache_dirty = true;
+		break;
+	}
+
+	obj->write_domain = 0;
+}
+
 void i915_gem_init__objects(struct drm_i915_private *i915)
 {
 	INIT_WORK(&i915->mm.free_work, __i915_gem_free_work);

drivers/gpu/drm/i915/gem/i915_gem_object.h

@@ -351,6 +351,13 @@ static inline void i915_gem_object_unpin_map(struct drm_i915_gem_object *obj)
 	i915_gem_object_unpin_pages(obj);
 }
 
+void __i915_gem_object_release_mmap(struct drm_i915_gem_object *obj);
+void i915_gem_object_release_mmap(struct drm_i915_gem_object *obj);
+
+void
+i915_gem_object_flush_write_domain(struct drm_i915_gem_object *obj,
+				   unsigned int flush_domains);
+
 static inline struct intel_engine_cs *
 i915_gem_object_last_write_engine(struct drm_i915_gem_object *obj)
 {

drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c

+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2016 Intel Corporation
+ */
+
+#include <linux/prime_numbers.h>
+
+#include "gt/intel_gt_pm.h"
+#include "i915_selftest.h"
+#include "selftests/huge_gem_object.h"
+#include "selftests/igt_flush_test.h"
+
+struct tile {
+	unsigned int width;
+	unsigned int height;
+	unsigned int stride;
+	unsigned int size;
+	unsigned int tiling;
+	unsigned int swizzle;
+};
+
+static u64 swizzle_bit(unsigned int bit, u64 offset)
+{
+	return (offset & BIT_ULL(bit)) >> (bit - 6);
+}
+
+static u64 tiled_offset(const struct tile *tile, u64 v)
+{
+	u64 x, y;
+
+	if (tile->tiling == I915_TILING_NONE)
+		return v;
+
+	y = div64_u64_rem(v, tile->stride, &x);
+	v = div64_u64_rem(y, tile->height, &y) * tile->stride * tile->height;
+
+	if (tile->tiling == I915_TILING_X) {
+		v += y * tile->width;
+		v += div64_u64_rem(x, tile->width, &x) << tile->size;
+		v += x;
+	} else if (tile->width == 128) {
+		const unsigned int ytile_span = 16;
+		const unsigned int ytile_height = 512;
+
+		v += y * ytile_span;
+		v += div64_u64_rem(x, ytile_span, &x) * ytile_height;
+		v += x;
+	} else {
+		const unsigned int ytile_span = 32;
+		const unsigned int ytile_height = 256;
+
+		v += y * ytile_span;
+		v += div64_u64_rem(x, ytile_span, &x) * ytile_height;
+		v += x;
+	}
+
+	switch (tile->swizzle) {
+	case I915_BIT_6_SWIZZLE_9:
+		v ^= swizzle_bit(9, v);
+		break;
+	case I915_BIT_6_SWIZZLE_9_10:
+		v ^= swizzle_bit(9, v) ^ swizzle_bit(10, v);
+		break;
+	case I915_BIT_6_SWIZZLE_9_11:
+		v ^= swizzle_bit(9, v) ^ swizzle_bit(11, v);
+		break;
+	case I915_BIT_6_SWIZZLE_9_10_11:
+		v ^= swizzle_bit(9, v) ^ swizzle_bit(10, v) ^ swizzle_bit(11, v);
+		break;
+	}
+
+	return v;
+}
+
+static int check_partial_mapping(struct drm_i915_gem_object *obj,
+				 const struct tile *tile,
+				 unsigned long end_time)
+{
+	const unsigned int nreal = obj->scratch / PAGE_SIZE;
+	const unsigned long npages = obj->base.size / PAGE_SIZE;
+	struct i915_vma *vma;
+	unsigned long page;
+	int err;
+
+	if (igt_timeout(end_time,
+			"%s: timed out before tiling=%d stride=%d\n",
+			__func__, tile->tiling, tile->stride))
+		return -EINTR;
+
+	err = i915_gem_object_set_tiling(obj, tile->tiling, tile->stride);
+	if (err) {
+		pr_err("Failed to set tiling mode=%u, stride=%u, err=%d\n",
+		       tile->tiling, tile->stride, err);
+		return err;
+	}
+
+	GEM_BUG_ON(i915_gem_object_get_tiling(obj) != tile->tiling);
+	GEM_BUG_ON(i915_gem_object_get_stride(obj) != tile->stride);
+
+	for_each_prime_number_from(page, 1, npages) {
+		struct i915_ggtt_view view =
+			compute_partial_view(obj, page, MIN_CHUNK_PAGES);
+		u32 __iomem *io;
+		struct page *p;
+		unsigned int n;
+		u64 offset;
+		u32 *cpu;
+
+		GEM_BUG_ON(view.partial.size > nreal);
+		cond_resched();
+
+		err = i915_gem_object_set_to_gtt_domain(obj, true);
+		if (err) {
+			pr_err("Failed to flush to GTT write domain; err=%d\n",
+			       err);
+			return err;
+		}
+
+		vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, PIN_MAPPABLE);
+		if (IS_ERR(vma)) {
+			pr_err("Failed to pin partial view: offset=%lu; err=%d\n",
+			       page, (int)PTR_ERR(vma));
+			return PTR_ERR(vma);
+		}
+
+		n = page - view.partial.offset;
+		GEM_BUG_ON(n >= view.partial.size);
+
+		io = i915_vma_pin_iomap(vma);
+		i915_vma_unpin(vma);
+		if (IS_ERR(io)) {
+			pr_err("Failed to iomap partial view: offset=%lu; err=%d\n",
+			       page, (int)PTR_ERR(io));
+			return PTR_ERR(io);
+		}
+
+		iowrite32(page, io + n * PAGE_SIZE / sizeof(*io));
+		i915_vma_unpin_iomap(vma);
+
+		offset = tiled_offset(tile, page << PAGE_SHIFT);
+		if (offset >= obj->base.size)
+			continue;
+
+		i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+
+		p = i915_gem_object_get_page(obj, offset >> PAGE_SHIFT);
+		cpu = kmap(p) + offset_in_page(offset);
+		drm_clflush_virt_range(cpu, sizeof(*cpu));
+		if (*cpu != (u32)page) {
+			pr_err("Partial view for %lu [%u] (offset=%llu, size=%u [%llu, row size %u], fence=%d, tiling=%d, stride=%d) misalignment, expected write to page (%llu + %u [0x%llx]) of 0x%x, found 0x%x\n",
+			       page, n,
+			       view.partial.offset,
+			       view.partial.size,
+			       vma->size >> PAGE_SHIFT,
+			       tile->tiling ? tile_row_pages(obj) : 0,
+			       vma->fence ? vma->fence->id : -1, tile->tiling, tile->stride,
+			       offset >> PAGE_SHIFT,
+			       (unsigned int)offset_in_page(offset),
+			       offset,
+			       (u32)page, *cpu);
+			err = -EINVAL;
+		}
+		*cpu = 0;
+		drm_clflush_virt_range(cpu, sizeof(*cpu));
+		kunmap(p);
+		if (err)
+			return err;
+
+		i915_vma_destroy(vma);
+	}
+
+	return 0;
+}
+
+static int igt_partial_tiling(void *arg)
+{
+	const unsigned int nreal = 1 << 12; /* largest tile row x2 */
+	struct drm_i915_private *i915 = arg;
+	struct drm_i915_gem_object *obj;
+	intel_wakeref_t wakeref;
+	int tiling;
+	int err;
+
+	/* We want to check the page mapping and fencing of a large object
+	 * mmapped through the GTT. The object we create is larger than can
+	 * possibly be mmaped as a whole, and so we must use partial GGTT vma.
+	 * We then check that a write through each partial GGTT vma ends up
+	 * in the right set of pages within the object, and with the expected
+	 * tiling, which we verify by manual swizzling.
+	 */
+
+	obj = huge_gem_object(i915,
+			      nreal << PAGE_SHIFT,
+			      (1 + next_prime_number(i915->ggtt.vm.total >> PAGE_SHIFT)) << PAGE_SHIFT);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+
+	err = i915_gem_object_pin_pages(obj);
+	if (err) {
+		pr_err("Failed to allocate %u pages (%lu total), err=%d\n",
+		       nreal, obj->base.size / PAGE_SIZE, err);
+		goto out;
+	}
+
+	mutex_lock(&i915->drm.struct_mutex);
+	wakeref = intel_runtime_pm_get(i915);
+
+	if (1) {
+		IGT_TIMEOUT(end);
+		struct tile tile;
+
+		tile.height = 1;
+		tile.width = 1;
+		tile.size = 0;
+		tile.stride = 0;
+		tile.swizzle = I915_BIT_6_SWIZZLE_NONE;
+		tile.tiling = I915_TILING_NONE;
+
+		err = check_partial_mapping(obj, &tile, end);
+		if (err && err != -EINTR)
+			goto out_unlock;
+	}
+
+	for (tiling = I915_TILING_X; tiling <= I915_TILING_Y; tiling++) {
+		IGT_TIMEOUT(end);
+		unsigned int max_pitch;
+		unsigned int pitch;
+		struct tile tile;
+
+		if (i915->quirks & QUIRK_PIN_SWIZZLED_PAGES)
+			/*
+			 * The swizzling pattern is actually unknown as it
+			 * varies based on physical address of each page.
+			 * See i915_gem_detect_bit_6_swizzle().
+			 */
+			break;
+
+		tile.tiling = tiling;
+		switch (tiling) {
+		case I915_TILING_X:
+			tile.swizzle = i915->mm.bit_6_swizzle_x;
+			break;
+		case I915_TILING_Y:
+			tile.swizzle = i915->mm.bit_6_swizzle_y;
+			break;
+		}
+
+		GEM_BUG_ON(tile.swizzle == I915_BIT_6_SWIZZLE_UNKNOWN);
+		if (tile.swizzle == I915_BIT_6_SWIZZLE_9_17 ||
+		    tile.swizzle == I915_BIT_6_SWIZZLE_9_10_17)
+			continue;
+
+		if (INTEL_GEN(i915) <= 2) {
+			tile.height = 16;
+			tile.width = 128;
+			tile.size = 11;
+		} else if (tile.tiling == I915_TILING_Y &&
+			   HAS_128_BYTE_Y_TILING(i915)) {
+			tile.height = 32;
+			tile.width = 128;
+			tile.size = 12;
+		} else {
+			tile.height = 8;
+			tile.width = 512;
+			tile.size = 12;
+		}
+
+		if (INTEL_GEN(i915) < 4)
+			max_pitch = 8192 / tile.width;
+		else if (INTEL_GEN(i915) < 7)
+			max_pitch = 128 * I965_FENCE_MAX_PITCH_VAL / tile.width;
+		else
+			max_pitch = 128 * GEN7_FENCE_MAX_PITCH_VAL / tile.width;
+
+		for (pitch = max_pitch; pitch; pitch >>= 1) {
+			tile.stride = tile.width * pitch;
+			err = check_partial_mapping(obj, &tile, end);
+			if (err == -EINTR)
+				goto next_tiling;
+			if (err)
+				goto out_unlock;
+
+			if (pitch > 2 && INTEL_GEN(i915) >= 4) {
+				tile.stride = tile.width * (pitch - 1);
+				err = check_partial_mapping(obj, &tile, end);
+				if (err == -EINTR)
+					goto next_tiling;
+				if (err)
+					goto out_unlock;
+			}
+
+			if (pitch < max_pitch && INTEL_GEN(i915) >= 4) {
+				tile.stride = tile.width * (pitch + 1);
+				err = check_partial_mapping(obj, &tile, end);
+				if (err == -EINTR)
+					goto next_tiling;
+				if (err)
+					goto out_unlock;
+			}
+		}
+
+		if (INTEL_GEN(i915) >= 4) {
+			for_each_prime_number(pitch, max_pitch) {
+				tile.stride = tile.width * pitch;
+				err = check_partial_mapping(obj, &tile, end);
+				if (err == -EINTR)
+					goto next_tiling;
+				if (err)
+					goto out_unlock;
+			}
+		}
+
+next_tiling: ;
+	}
+
+out_unlock:
+	intel_runtime_pm_put(i915, wakeref);
+	mutex_unlock(&i915->drm.struct_mutex);
+	i915_gem_object_unpin_pages(obj);
+out:
+	i915_gem_object_put(obj);
+	return err;
+}
+
+static int make_obj_busy(struct drm_i915_gem_object *obj)
+{
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct i915_request *rq;
+	struct i915_vma *vma;
+	int err;
+
+	vma = i915_vma_instance(obj, &i915->ggtt.vm, NULL);
+	if (IS_ERR(vma))
+		return PTR_ERR(vma);
+
+	err = i915_vma_pin(vma, 0, 0, PIN_USER);
+	if (err)
+		return err;
+
+	rq = i915_request_create(i915->engine[RCS0]->kernel_context);
+	if (IS_ERR(rq)) {
+		i915_vma_unpin(vma);
+		return PTR_ERR(rq);
+	}
+
+	err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
+
+	i915_request_add(rq);
+
+	__i915_gem_object_release_unless_active(obj);
+	i915_vma_unpin(vma);
+
+	return err;
+}
+
+static bool assert_mmap_offset(struct drm_i915_private *i915,
+			       unsigned long size,
+			       int expected)
+{
+	struct drm_i915_gem_object *obj;
+	int err;
+
+	obj = i915_gem_object_create_internal(i915, size);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+
+	err = create_mmap_offset(obj);
+	i915_gem_object_put(obj);
+
+	return err == expected;
+}
+
+static void disable_retire_worker(struct drm_i915_private *i915)
+{
+	i915_gem_shrinker_unregister(i915);
+
+	intel_gt_pm_get(i915);
+
+	cancel_delayed_work_sync(&i915->gem.retire_work);
+	flush_work(&i915->gem.idle_work);
+}
+
+static void restore_retire_worker(struct drm_i915_private *i915)
+{
+	intel_gt_pm_put(i915);
+
+	mutex_lock(&i915->drm.struct_mutex);
+	igt_flush_test(i915, I915_WAIT_LOCKED);
+	mutex_unlock(&i915->drm.struct_mutex);
+
+	i915_gem_shrinker_register(i915);
+}
+
+static int igt_mmap_offset_exhaustion(void *arg)
+{
+	struct drm_i915_private *i915 = arg;
+	struct drm_mm *mm = &i915->drm.vma_offset_manager->vm_addr_space_mm;
+	struct drm_i915_gem_object *obj;
+	struct drm_mm_node resv, *hole;
+	u64 hole_start, hole_end;
+	int loop, err;
+
+	/* Disable background reaper */
+	disable_retire_worker(i915);
+	GEM_BUG_ON(!i915->gt.awake);
+
+	/* Trim the device mmap space to only a page */
+	memset(&resv, 0, sizeof(resv));
+	drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
+		resv.start = hole_start;
+		resv.size = hole_end - hole_start - 1; /* PAGE_SIZE units */
+		err = drm_mm_reserve_node(mm, &resv);
+		if (err) {
+			pr_err("Failed to trim VMA manager, err=%d\n", err);
+			goto out_park;
+		}
+		break;
+	}
+
+	/* Just fits! */
+	if (!assert_mmap_offset(i915, PAGE_SIZE, 0)) {
+		pr_err("Unable to insert object into single page hole\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	/* Too large */
+	if (!assert_mmap_offset(i915, 2 * PAGE_SIZE, -ENOSPC)) {
+		pr_err("Unexpectedly succeeded in inserting too large object into single page hole\n");
+		err = -EINVAL;
+		goto out;
+	}
+
+	/* Fill the hole, further allocation attempts should then fail */
+	obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
+	if (IS_ERR(obj)) {
+		err = PTR_ERR(obj);
+		goto out;
+	}
+
+	err = create_mmap_offset(obj);
+	if (err) {
+		pr_err("Unable to insert object into reclaimed hole\n");
+		goto err_obj;
+	}
+
+	if (!assert_mmap_offset(i915, PAGE_SIZE, -ENOSPC)) {
+		pr_err("Unexpectedly succeeded in inserting object into no holes!\n");
+		err = -EINVAL;
+		goto err_obj;
+	}
+
+	i915_gem_object_put(obj);
+
+	/* Now fill with busy dead objects that we expect to reap */
+	for (loop = 0; loop < 3; loop++) {
+		if (i915_terminally_wedged(i915))
+			break;
+
+		obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
+		if (IS_ERR(obj)) {
+			err = PTR_ERR(obj);
+			goto out;
+		}
+
+		mutex_lock(&i915->drm.struct_mutex);
+		err = make_obj_busy(obj);
+		mutex_unlock(&i915->drm.struct_mutex);
+		if (err) {
+			pr_err("[loop %d] Failed to busy the object\n", loop);
+			goto err_obj;
+		}
+
+		/* NB we rely on the _active_ reference to access obj now */
+		GEM_BUG_ON(!i915_gem_object_is_active(obj));
+		err = create_mmap_offset(obj);
+		if (err) {
+			pr_err("[loop %d] create_mmap_offset failed with err=%d\n",
+			       loop, err);
+			goto out;
+		}
+	}
+
+out:
+	drm_mm_remove_node(&resv);
+out_park:
+	restore_retire_worker(i915);
+	return err;
+err_obj:
+	i915_gem_object_put(obj);
+	goto out;
+}
+
+int i915_gem_mman_live_selftests(struct drm_i915_private *i915)
+{
+	static const struct i915_subtest tests[] = {
+		SUBTEST(igt_partial_tiling),
+		SUBTEST(igt_mmap_offset_exhaustion),
+	};
+
+	return i915_subtests(tests, i915);
+}

drivers/gpu/drm/i915/i915_drv.h

@@ -2806,7 +2806,6 @@ i915_gem_object_ggtt_pin(struct drm_i915_gem_object *obj,
 			 u64 flags);
 
 int i915_gem_object_unbind(struct drm_i915_gem_object *obj);
-void i915_gem_release_mmap(struct drm_i915_gem_object *obj);
 
 void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv);
 

drivers/gpu/drm/i915/i915_gem.c

@@ -404,12 +404,6 @@ i915_gem_dumb_create(struct drm_file *file,
 			       &args->size, &args->handle);
 }
 
-static bool gpu_write_needs_clflush(struct drm_i915_gem_object *obj)
-{
-	return !(obj->cache_level == I915_CACHE_NONE ||
-		 obj->cache_level == I915_CACHE_WT);
-}
-
 /**
  * Creates a new mm object and returns a handle to it.
  * @dev: drm device pointer
@@ -429,13 +423,6 @@ i915_gem_create_ioctl(struct drm_device *dev, void *data,
 			       &args->size, &args->handle);
 }
 
-static inline enum fb_op_origin
-fb_write_origin(struct drm_i915_gem_object *obj, unsigned int domain)
-{
-	return (domain == I915_GEM_DOMAIN_GTT ?
-		obj->frontbuffer_ggtt_origin : ORIGIN_CPU);
-}
-
 void i915_gem_flush_ggtt_writes(struct drm_i915_private *dev_priv)
 {
 	intel_wakeref_t wakeref;
@@ -475,47 +462,6 @@ void i915_gem_flush_ggtt_writes(struct drm_i915_private *dev_priv)
 	}
 }
 
-static void
-flush_write_domain(struct drm_i915_gem_object *obj, unsigned int flush_domains)
-{
-	struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
-	struct i915_vma *vma;
-
-	if (!(obj->write_domain & flush_domains))
-		return;
-
-	switch (obj->write_domain) {
-	case I915_GEM_DOMAIN_GTT:
-		i915_gem_flush_ggtt_writes(dev_priv);
-
-		intel_fb_obj_flush(obj,
-				   fb_write_origin(obj, I915_GEM_DOMAIN_GTT));
-
-		for_each_ggtt_vma(vma, obj) {
-			if (vma->iomap)
-				continue;
-
-			i915_vma_unset_ggtt_write(vma);
-		}
-		break;
-
-	case I915_GEM_DOMAIN_WC:
-		wmb();
-		break;
-
-	case I915_GEM_DOMAIN_CPU:
-		i915_gem_clflush_object(obj, I915_CLFLUSH_SYNC);
-		break;
-
-	case I915_GEM_DOMAIN_RENDER:
-		if (gpu_write_needs_clflush(obj))
-			obj->cache_dirty = true;
-		break;
-	}
-
-	obj->write_domain = 0;
-}
-
 /*
  * Pins the specified object's pages and synchronizes the object with
  * GPU accesses. Sets needs_clflush to non-zero if the caller should
@@ -552,7 +498,7 @@ int i915_gem_obj_prepare_shmem_read(struct drm_i915_gem_object *obj,
 			goto out;
 	}
 
-	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
 
 	/* If we're not in the cpu read domain, set ourself into the gtt
 	 * read domain and manually flush cachelines (if required). This
@@ -604,7 +550,7 @@ int i915_gem_obj_prepare_shmem_write(struct drm_i915_gem_object *obj,
 			goto out;
 	}
 
-	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
 
 	/* If we're not in the cpu write domain, set ourself into the
 	 * gtt write domain and manually flush cachelines (as required).
@@ -1207,6 +1153,13 @@ static void i915_gem_object_bump_inactive_ggtt(struct drm_i915_gem_object *obj)
 	spin_unlock(&i915->mm.obj_lock);
 }
 
+static inline enum fb_op_origin
+fb_write_origin(struct drm_i915_gem_object *obj, unsigned int domain)
+{
+	return (domain == I915_GEM_DOMAIN_GTT ?
+		obj->frontbuffer_ggtt_origin : ORIGIN_CPU);
+}
+
 /**
  * Called when user space prepares to use an object with the CPU, either
  * through the mmap ioctl's mapping or a GTT mapping.
@@ -1350,423 +1303,6 @@ i915_gem_sw_finish_ioctl(struct drm_device *dev, void *data,
 	return 0;
 }
 
-static inline bool
-__vma_matches(struct vm_area_struct *vma, struct file *filp,
-	      unsigned long addr, unsigned long size)
-{
-	if (vma->vm_file != filp)
-		return false;
-
-	return vma->vm_start == addr &&
-	       (vma->vm_end - vma->vm_start) == PAGE_ALIGN(size);
-}
-
-/**
- * i915_gem_mmap_ioctl - Maps the contents of an object, returning the address
- *			 it is mapped to.
- * @dev: drm device
- * @data: ioctl data blob
- * @file: drm file
- *
- * While the mapping holds a reference on the contents of the object, it doesn't
- * imply a ref on the object itself.
- *
- * IMPORTANT:
- *
- * DRM driver writers who look a this function as an example for how to do GEM
- * mmap support, please don't implement mmap support like here. The modern way
- * to implement DRM mmap support is with an mmap offset ioctl (like
- * i915_gem_mmap_gtt) and then using the mmap syscall on the DRM fd directly.
- * That way debug tooling like valgrind will understand what's going on, hiding
- * the mmap call in a driver private ioctl will break that. The i915 driver only
- * does cpu mmaps this way because we didn't know better.
- */
-int
-i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
-		    struct drm_file *file)
-{
-	struct drm_i915_gem_mmap *args = data;
-	struct drm_i915_gem_object *obj;
-	unsigned long addr;
-
-	if (args->flags & ~(I915_MMAP_WC))
-		return -EINVAL;
-
-	if (args->flags & I915_MMAP_WC && !boot_cpu_has(X86_FEATURE_PAT))
-		return -ENODEV;
-
-	obj = i915_gem_object_lookup(file, args->handle);
-	if (!obj)
-		return -ENOENT;
-
-	/* prime objects have no backing filp to GEM mmap
-	 * pages from.
-	 */
-	if (!obj->base.filp) {
-		addr = -ENXIO;
-		goto err;
-	}
-
-	if (range_overflows(args->offset, args->size, (u64)obj->base.size)) {
-		addr = -EINVAL;
-		goto err;
-	}
-
-	addr = vm_mmap(obj->base.filp, 0, args->size,
-		       PROT_READ | PROT_WRITE, MAP_SHARED,
-		       args->offset);
-	if (IS_ERR_VALUE(addr))
-		goto err;
-
-	if (args->flags & I915_MMAP_WC) {
-		struct mm_struct *mm = current->mm;
-		struct vm_area_struct *vma;
-
-		if (down_write_killable(&mm->mmap_sem)) {
-			addr = -EINTR;
-			goto err;
-		}
-		vma = find_vma(mm, addr);
-		if (vma && __vma_matches(vma, obj->base.filp, addr, args->size))
-			vma->vm_page_prot =
-				pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
-		else
-			addr = -ENOMEM;
-		up_write(&mm->mmap_sem);
-		if (IS_ERR_VALUE(addr))
-			goto err;
-
-		/* This may race, but that's ok, it only gets set */
-		WRITE_ONCE(obj->frontbuffer_ggtt_origin, ORIGIN_CPU);
-	}
-	i915_gem_object_put(obj);
-
-	args->addr_ptr = (u64)addr;
-	return 0;
-
-err:
-	i915_gem_object_put(obj);
-	return addr;
-}
-
-static unsigned int tile_row_pages(const struct drm_i915_gem_object *obj)
-{
-	return i915_gem_object_get_tile_row_size(obj) >> PAGE_SHIFT;
-}
-
-/**
- * i915_gem_mmap_gtt_version - report the current feature set for GTT mmaps
- *
- * A history of the GTT mmap interface:
- *
- * 0 - Everything had to fit into the GTT. Both parties of a memcpy had to
- *     aligned and suitable for fencing, and still fit into the available
- *     mappable space left by the pinned display objects. A classic problem
- *     we called the page-fault-of-doom where we would ping-pong between
- *     two objects that could not fit inside the GTT and so the memcpy
- *     would page one object in at the expense of the other between every
- *     single byte.
- *
- * 1 - Objects can be any size, and have any compatible fencing (X Y, or none
- *     as set via i915_gem_set_tiling() [DRM_I915_GEM_SET_TILING]). If the
- *     object is too large for the available space (or simply too large
- *     for the mappable aperture!), a view is created instead and faulted
- *     into userspace. (This view is aligned and sized appropriately for
- *     fenced access.)
- *
- * 2 - Recognise WC as a separate cache domain so that we can flush the
- *     delayed writes via GTT before performing direct access via WC.
- *
- * 3 - Remove implicit set-domain(GTT) and synchronisation on initial
- *     pagefault; swapin remains transparent.
- *
- * Restrictions:
- *
- *  * snoopable objects cannot be accessed via the GTT. It can cause machine
- *    hangs on some architectures, corruption on others. An attempt to service
- *    a GTT page fault from a snoopable object will generate a SIGBUS.
- *
- *  * the object must be able to fit into RAM (physical memory, though no
- *    limited to the mappable aperture).
- *
- *
- * Caveats:
- *
- *  * a new GTT page fault will synchronize rendering from the GPU and flush
- *    all data to system memory. Subsequent access will not be synchronized.
- *
- *  * all mappings are revoked on runtime device suspend.
- *
- *  * there are only 8, 16 or 32 fence registers to share between all users
- *    (older machines require fence register for display and blitter access
- *    as well). Contention of the fence registers will cause the previous users
- *    to be unmapped and any new access will generate new page faults.
- *
- *  * running out of memory while servicing a fault may generate a SIGBUS,
- *    rather than the expected SIGSEGV.
- */
-int i915_gem_mmap_gtt_version(void)
-{
-	return 3;
-}
-
-static inline struct i915_ggtt_view
-compute_partial_view(const struct drm_i915_gem_object *obj,
-		     pgoff_t page_offset,
-		     unsigned int chunk)
-{
-	struct i915_ggtt_view view;
-
-	if (i915_gem_object_is_tiled(obj))
-		chunk = roundup(chunk, tile_row_pages(obj));
-
-	view.type = I915_GGTT_VIEW_PARTIAL;
-	view.partial.offset = rounddown(page_offset, chunk);
-	view.partial.size =
-		min_t(unsigned int, chunk,
-		      (obj->base.size >> PAGE_SHIFT) - view.partial.offset);
-
-	/* If the partial covers the entire object, just create a normal VMA. */
-	if (chunk >= obj->base.size >> PAGE_SHIFT)
-		view.type = I915_GGTT_VIEW_NORMAL;
-
-	return view;
-}
-
-/**
- * i915_gem_fault - fault a page into the GTT
- * @vmf: fault info
- *
- * The fault handler is set up by drm_gem_mmap() when a object is GTT mapped
- * from userspace.  The fault handler takes care of binding the object to
- * the GTT (if needed), allocating and programming a fence register (again,
- * only if needed based on whether the old reg is still valid or the object
- * is tiled) and inserting a new PTE into the faulting process.
- *
- * Note that the faulting process may involve evicting existing objects
- * from the GTT and/or fence registers to make room.  So performance may
- * suffer if the GTT working set is large or there are few fence registers
- * left.
- *
- * The current feature set supported by i915_gem_fault() and thus GTT mmaps
- * is exposed via I915_PARAM_MMAP_GTT_VERSION (see i915_gem_mmap_gtt_version).
- */
-vm_fault_t i915_gem_fault(struct vm_fault *vmf)
-{
-#define MIN_CHUNK_PAGES (SZ_1M >> PAGE_SHIFT)
-	struct vm_area_struct *area = vmf->vma;
-	struct drm_i915_gem_object *obj = to_intel_bo(area->vm_private_data);
-	struct drm_device *dev = obj->base.dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct i915_ggtt *ggtt = &dev_priv->ggtt;
-	bool write = area->vm_flags & VM_WRITE;
-	intel_wakeref_t wakeref;
-	struct i915_vma *vma;
-	pgoff_t page_offset;
-	int srcu;
-	int ret;
-
-	/* Sanity check that we allow writing into this object */
-	if (i915_gem_object_is_readonly(obj) && write)
-		return VM_FAULT_SIGBUS;
-
-	/* We don't use vmf->pgoff since that has the fake offset */
-	page_offset = (vmf->address - area->vm_start) >> PAGE_SHIFT;
-
-	trace_i915_gem_object_fault(obj, page_offset, true, write);
-
-	ret = i915_gem_object_pin_pages(obj);
-	if (ret)
-		goto err;
-
-	wakeref = intel_runtime_pm_get(dev_priv);
-
-	srcu = i915_reset_trylock(dev_priv);
-	if (srcu < 0) {
-		ret = srcu;
-		goto err_rpm;
-	}
-
-	ret = i915_mutex_lock_interruptible(dev);
-	if (ret)
-		goto err_reset;
-
-	/* Access to snoopable pages through the GTT is incoherent. */
-	if (obj->cache_level != I915_CACHE_NONE && !HAS_LLC(dev_priv)) {
-		ret = -EFAULT;
-		goto err_unlock;
-	}
-
-	/* Now pin it into the GTT as needed */
-	vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0,
-				       PIN_MAPPABLE |
-				       PIN_NONBLOCK |
-				       PIN_NONFAULT);
-	if (IS_ERR(vma)) {
-		/* Use a partial view if it is bigger than available space */
-		struct i915_ggtt_view view =
-			compute_partial_view(obj, page_offset, MIN_CHUNK_PAGES);
-		unsigned int flags;
-
-		flags = PIN_MAPPABLE;
-		if (view.type == I915_GGTT_VIEW_NORMAL)
-			flags |= PIN_NONBLOCK; /* avoid warnings for pinned */
-
-		/*
-		 * Userspace is now writing through an untracked VMA, abandon
-		 * all hope that the hardware is able to track future writes.
-		 */
-		obj->frontbuffer_ggtt_origin = ORIGIN_CPU;
-
-		vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);
-		if (IS_ERR(vma) && !view.type) {
-			flags = PIN_MAPPABLE;
-			view.type = I915_GGTT_VIEW_PARTIAL;
-			vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, flags);
-		}
-	}
-	if (IS_ERR(vma)) {
-		ret = PTR_ERR(vma);
-		goto err_unlock;
-	}
-
-	ret = i915_vma_pin_fence(vma);
-	if (ret)
-		goto err_unpin;
-
-	/* Finally, remap it using the new GTT offset */
-	ret = remap_io_mapping(area,
-			       area->vm_start + (vma->ggtt_view.partial.offset << PAGE_SHIFT),
-			       (ggtt->gmadr.start + vma->node.start) >> PAGE_SHIFT,
-			       min_t(u64, vma->size, area->vm_end - area->vm_start),
-			       &ggtt->iomap);
-	if (ret)
-		goto err_fence;
-
-	/* Mark as being mmapped into userspace for later revocation */
-	assert_rpm_wakelock_held(dev_priv);
-	if (!i915_vma_set_userfault(vma) && !obj->userfault_count++)
-		list_add(&obj->userfault_link, &dev_priv->mm.userfault_list);
-	if (CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND)
-		intel_wakeref_auto(&dev_priv->mm.userfault_wakeref,
-				   msecs_to_jiffies_timeout(CONFIG_DRM_I915_USERFAULT_AUTOSUSPEND));
-	GEM_BUG_ON(!obj->userfault_count);
-
-	i915_vma_set_ggtt_write(vma);
-
-err_fence:
-	i915_vma_unpin_fence(vma);
-err_unpin:
-	__i915_vma_unpin(vma);
-err_unlock:
-	mutex_unlock(&dev->struct_mutex);
-err_reset:
-	i915_reset_unlock(dev_priv, srcu);
-err_rpm:
-	intel_runtime_pm_put(dev_priv, wakeref);
-	i915_gem_object_unpin_pages(obj);
-err:
-	switch (ret) {
-	case -EIO:
-		/*
-		 * We eat errors when the gpu is terminally wedged to avoid
-		 * userspace unduly crashing (gl has no provisions for mmaps to
-		 * fail). But any other -EIO isn't ours (e.g. swap in failure)
-		 * and so needs to be reported.
-		 */
-		if (!i915_terminally_wedged(dev_priv))
-			return VM_FAULT_SIGBUS;
-		/* else: fall through */
-	case -EAGAIN:
-		/*
-		 * EAGAIN means the gpu is hung and we'll wait for the error
-		 * handler to reset everything when re-faulting in
-		 * i915_mutex_lock_interruptible.
-		 */
-	case 0:
-	case -ERESTARTSYS:
-	case -EINTR:
-	case -EBUSY:
-		/*
-		 * EBUSY is ok: this just means that another thread
-		 * already did the job.
-		 */
-		return VM_FAULT_NOPAGE;
-	case -ENOMEM:
-		return VM_FAULT_OOM;
-	case -ENOSPC:
-	case -EFAULT:
-		return VM_FAULT_SIGBUS;
-	default:
-		WARN_ONCE(ret, "unhandled error in i915_gem_fault: %i\n", ret);
-		return VM_FAULT_SIGBUS;
-	}
-}
-
-static void __i915_gem_object_release_mmap(struct drm_i915_gem_object *obj)
-{
-	struct i915_vma *vma;
-
-	GEM_BUG_ON(!obj->userfault_count);
-
-	obj->userfault_count = 0;
-	list_del(&obj->userfault_link);
-	drm_vma_node_unmap(&obj->base.vma_node,
-			   obj->base.dev->anon_inode->i_mapping);
-
-	for_each_ggtt_vma(vma, obj)
-		i915_vma_unset_userfault(vma);
-}
-
-/**
- * i915_gem_release_mmap - remove physical page mappings
- * @obj: obj in question
- *
- * Preserve the reservation of the mmapping with the DRM core code, but
- * relinquish ownership of the pages back to the system.
- *
- * It is vital that we remove the page mapping if we have mapped a tiled
- * object through the GTT and then lose the fence register due to
- * resource pressure. Similarly if the object has been moved out of the
- * aperture, than pages mapped into userspace must be revoked. Removing the
- * mapping will then trigger a page fault on the next user access, allowing
- * fixup by i915_gem_fault().
- */
-void
-i915_gem_release_mmap(struct drm_i915_gem_object *obj)
-{
-	struct drm_i915_private *i915 = to_i915(obj->base.dev);
-	intel_wakeref_t wakeref;
-
-	/* 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.
-	 */
-	lockdep_assert_held(&i915->drm.struct_mutex);
-	wakeref = intel_runtime_pm_get(i915);
-
-	if (!obj->userfault_count)
-		goto out;
-
-	__i915_gem_object_release_mmap(obj);
-
-	/* Ensure that the CPU's PTE are revoked and there are not outstanding
-	 * memory transactions from userspace before we return. The TLB
-	 * flushing implied above by changing the PTE above *should* be
-	 * sufficient, an extra barrier here just provides us with a bit
-	 * of paranoid documentation about our requirement to serialise
-	 * memory writes before touching registers / GSM.
-	 */
-	wmb();
-
-out:
-	intel_runtime_pm_put(i915, wakeref);
-}
-
 void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv)
 {
 	struct drm_i915_gem_object *obj, *on;
@@ -1809,78 +1345,6 @@ void i915_gem_runtime_suspend(struct drm_i915_private *dev_priv)
 	}
 }
 
-static int i915_gem_object_create_mmap_offset(struct drm_i915_gem_object *obj)
-{
-	struct drm_i915_private *dev_priv = to_i915(obj->base.dev);
-	int err;
-
-	err = drm_gem_create_mmap_offset(&obj->base);
-	if (likely(!err))
-		return 0;
-
-	/* Attempt to reap some mmap space from dead objects */
-	do {
-		err = i915_gem_wait_for_idle(dev_priv,
-					     I915_WAIT_INTERRUPTIBLE,
-					     MAX_SCHEDULE_TIMEOUT);
-		if (err)
-			break;
-
-		i915_gem_drain_freed_objects(dev_priv);
-		err = drm_gem_create_mmap_offset(&obj->base);
-		if (!err)
-			break;
-
-	} while (flush_delayed_work(&dev_priv->gem.retire_work));
-
-	return err;
-}
-
-int
-i915_gem_mmap_gtt(struct drm_file *file,
-		  struct drm_device *dev,
-		  u32 handle,
-		  u64 *offset)
-{
-	struct drm_i915_gem_object *obj;
-	int ret;
-
-	obj = i915_gem_object_lookup(file, handle);
-	if (!obj)
-		return -ENOENT;
-
-	ret = i915_gem_object_create_mmap_offset(obj);
-	if (ret == 0)
-		*offset = drm_vma_node_offset_addr(&obj->base.vma_node);
-
-	i915_gem_object_put(obj);
-	return ret;
-}
-
-/**
- * i915_gem_mmap_gtt_ioctl - prepare an object for GTT mmap'ing
- * @dev: DRM device
- * @data: GTT mapping ioctl data
- * @file: GEM object info
- *
- * Simply returns the fake offset to userspace so it can mmap it.
- * The mmap call will end up in drm_gem_mmap(), which will set things
- * up so we can get faults in the handler above.
- *
- * The fault handler will take care of binding the object into the GTT
- * (since it may have been evicted to make room for something), allocating
- * a fence register, and mapping the appropriate aperture address into
- * userspace.
- */
-int
-i915_gem_mmap_gtt_ioctl(struct drm_device *dev, void *data,
-			struct drm_file *file)
-{
-	struct drm_i915_gem_mmap_gtt *args = data;
-
-	return i915_gem_mmap_gtt(file, dev, args->handle, &args->offset);
-}
-
 bool i915_sg_trim(struct sg_table *orig_st)
 {
 	struct sg_table new_st;
@@ -2084,7 +1548,7 @@ static void __i915_gem_object_flush_for_display(struct drm_i915_gem_object *obj)
 	 * We manually flush the CPU domain so that we can override and
 	 * force the flush for the display, and perform it asyncrhonously.
 	 */
-	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
 	if (obj->cache_dirty)
 		i915_gem_clflush_object(obj, I915_CLFLUSH_FORCE);
 	obj->write_domain = 0;
@@ -2138,7 +1602,7 @@ i915_gem_object_set_to_wc_domain(struct drm_i915_gem_object *obj, bool write)
 	if (ret)
 		return ret;
 
-	flush_write_domain(obj, ~I915_GEM_DOMAIN_WC);
+	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_WC);
 
 	/* Serialise direct access to this object with the barriers for
 	 * coherent writes from the GPU, by effectively invalidating the
@@ -2200,7 +1664,7 @@ i915_gem_object_set_to_gtt_domain(struct drm_i915_gem_object *obj, bool write)
 	if (ret)
 		return ret;
 
-	flush_write_domain(obj, ~I915_GEM_DOMAIN_GTT);
+	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_GTT);
 
 	/* Serialise direct access to this object with the barriers for
 	 * coherent writes from the GPU, by effectively invalidating the
@@ -2309,7 +1773,7 @@ int i915_gem_object_set_cache_level(struct drm_i915_gem_object *obj,
 			 * then double check if the GTT mapping is still
 			 * valid for that pointer access.
 			 */
-			i915_gem_release_mmap(obj);
+			i915_gem_object_release_mmap(obj);
 
 			/* As we no longer need a fence for GTT access,
 			 * we can relinquish it now (and so prevent having
@@ -2564,7 +2028,7 @@ i915_gem_object_set_to_cpu_domain(struct drm_i915_gem_object *obj, bool write)
 	if (ret)
 		return ret;
 
-	flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
+	i915_gem_object_flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
 
 	/* Flush the CPU cache if it's still invalid. */
 	if ((obj->read_domains & I915_GEM_DOMAIN_CPU) == 0) {

drivers/gpu/drm/i915/i915_gem_tiling.c

@@ -299,7 +299,7 @@ i915_gem_object_set_tiling(struct drm_i915_gem_object *obj,
 	i915_gem_object_unlock(obj);
 
 	/* Force the fence to be reacquired for GTT access */
-	i915_gem_release_mmap(obj);
+	i915_gem_object_release_mmap(obj);
 
 	/* Try to preallocate memory required to save swizzling on put-pages */
 	if (i915_gem_object_needs_bit17_swizzle(obj)) {

drivers/gpu/drm/i915/selftests/i915_gem_object.c

@@ -89,491 +89,6 @@ static int igt_gem_huge(void *arg)
 	return err;
 }
 
-struct tile {
-	unsigned int width;
-	unsigned int height;
-	unsigned int stride;
-	unsigned int size;
-	unsigned int tiling;
-	unsigned int swizzle;
-};
-
-static u64 swizzle_bit(unsigned int bit, u64 offset)
-{
-	return (offset & BIT_ULL(bit)) >> (bit - 6);
-}
-
-static u64 tiled_offset(const struct tile *tile, u64 v)
-{
-	u64 x, y;
-
-	if (tile->tiling == I915_TILING_NONE)
-		return v;
-
-	y = div64_u64_rem(v, tile->stride, &x);
-	v = div64_u64_rem(y, tile->height, &y) * tile->stride * tile->height;
-
-	if (tile->tiling == I915_TILING_X) {
-		v += y * tile->width;
-		v += div64_u64_rem(x, tile->width, &x) << tile->size;
-		v += x;
-	} else if (tile->width == 128) {
-		const unsigned int ytile_span = 16;
-		const unsigned int ytile_height = 512;
-
-		v += y * ytile_span;
-		v += div64_u64_rem(x, ytile_span, &x) * ytile_height;
-		v += x;
-	} else {
-		const unsigned int ytile_span = 32;
-		const unsigned int ytile_height = 256;
-
-		v += y * ytile_span;
-		v += div64_u64_rem(x, ytile_span, &x) * ytile_height;
-		v += x;
-	}
-
-	switch (tile->swizzle) {
-	case I915_BIT_6_SWIZZLE_9:
-		v ^= swizzle_bit(9, v);
-		break;
-	case I915_BIT_6_SWIZZLE_9_10:
-		v ^= swizzle_bit(9, v) ^ swizzle_bit(10, v);
-		break;
-	case I915_BIT_6_SWIZZLE_9_11:
-		v ^= swizzle_bit(9, v) ^ swizzle_bit(11, v);
-		break;
-	case I915_BIT_6_SWIZZLE_9_10_11:
-		v ^= swizzle_bit(9, v) ^ swizzle_bit(10, v) ^ swizzle_bit(11, v);
-		break;
-	}
-
-	return v;
-}
-
-static int check_partial_mapping(struct drm_i915_gem_object *obj,
-				 const struct tile *tile,
-				 unsigned long end_time)
-{
-	const unsigned int nreal = obj->scratch / PAGE_SIZE;
-	const unsigned long npages = obj->base.size / PAGE_SIZE;
-	struct i915_vma *vma;
-	unsigned long page;
-	int err;
-
-	if (igt_timeout(end_time,
-			"%s: timed out before tiling=%d stride=%d\n",
-			__func__, tile->tiling, tile->stride))
-		return -EINTR;
-
-	err = i915_gem_object_set_tiling(obj, tile->tiling, tile->stride);
-	if (err) {
-		pr_err("Failed to set tiling mode=%u, stride=%u, err=%d\n",
-		       tile->tiling, tile->stride, err);
-		return err;
-	}
-
-	GEM_BUG_ON(i915_gem_object_get_tiling(obj) != tile->tiling);
-	GEM_BUG_ON(i915_gem_object_get_stride(obj) != tile->stride);
-
-	for_each_prime_number_from(page, 1, npages) {
-		struct i915_ggtt_view view =
-			compute_partial_view(obj, page, MIN_CHUNK_PAGES);
-		u32 __iomem *io;
-		struct page *p;
-		unsigned int n;
-		u64 offset;
-		u32 *cpu;
-
-		GEM_BUG_ON(view.partial.size > nreal);
-		cond_resched();
-
-		err = i915_gem_object_set_to_gtt_domain(obj, true);
-		if (err) {
-			pr_err("Failed to flush to GTT write domain; err=%d\n",
-			       err);
-			return err;
-		}
-
-		vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, PIN_MAPPABLE);
-		if (IS_ERR(vma)) {
-			pr_err("Failed to pin partial view: offset=%lu; err=%d\n",
-			       page, (int)PTR_ERR(vma));
-			return PTR_ERR(vma);
-		}
-
-		n = page - view.partial.offset;
-		GEM_BUG_ON(n >= view.partial.size);
-
-		io = i915_vma_pin_iomap(vma);
-		i915_vma_unpin(vma);
-		if (IS_ERR(io)) {
-			pr_err("Failed to iomap partial view: offset=%lu; err=%d\n",
-			       page, (int)PTR_ERR(io));
-			return PTR_ERR(io);
-		}
-
-		iowrite32(page, io + n * PAGE_SIZE/sizeof(*io));
-		i915_vma_unpin_iomap(vma);
-
-		offset = tiled_offset(tile, page << PAGE_SHIFT);
-		if (offset >= obj->base.size)
-			continue;
-
-		flush_write_domain(obj, ~I915_GEM_DOMAIN_CPU);
-
-		p = i915_gem_object_get_page(obj, offset >> PAGE_SHIFT);
-		cpu = kmap(p) + offset_in_page(offset);
-		drm_clflush_virt_range(cpu, sizeof(*cpu));
-		if (*cpu != (u32)page) {
-			pr_err("Partial view for %lu [%u] (offset=%llu, size=%u [%llu, row size %u], fence=%d, tiling=%d, stride=%d) misalignment, expected write to page (%llu + %u [0x%llx]) of 0x%x, found 0x%x\n",
-			       page, n,
-			       view.partial.offset,
-			       view.partial.size,
-			       vma->size >> PAGE_SHIFT,
-			       tile->tiling ? tile_row_pages(obj) : 0,
-			       vma->fence ? vma->fence->id : -1, tile->tiling, tile->stride,
-			       offset >> PAGE_SHIFT,
-			       (unsigned int)offset_in_page(offset),
-			       offset,
-			       (u32)page, *cpu);
-			err = -EINVAL;
-		}
-		*cpu = 0;
-		drm_clflush_virt_range(cpu, sizeof(*cpu));
-		kunmap(p);
-		if (err)
-			return err;
-
-		i915_vma_destroy(vma);
-	}
-
-	return 0;
-}
-
-static int igt_partial_tiling(void *arg)
-{
-	const unsigned int nreal = 1 << 12; /* largest tile row x2 */
-	struct drm_i915_private *i915 = arg;
-	struct drm_i915_gem_object *obj;
-	intel_wakeref_t wakeref;
-	int tiling;
-	int err;
-
-	/* We want to check the page mapping and fencing of a large object
-	 * mmapped through the GTT. The object we create is larger than can
-	 * possibly be mmaped as a whole, and so we must use partial GGTT vma.
-	 * We then check that a write through each partial GGTT vma ends up
-	 * in the right set of pages within the object, and with the expected
-	 * tiling, which we verify by manual swizzling.
-	 */
-
-	obj = huge_gem_object(i915,
-			      nreal << PAGE_SHIFT,
-			      (1 + next_prime_number(i915->ggtt.vm.total >> PAGE_SHIFT)) << PAGE_SHIFT);
-	if (IS_ERR(obj))
-		return PTR_ERR(obj);
-
-	err = i915_gem_object_pin_pages(obj);
-	if (err) {
-		pr_err("Failed to allocate %u pages (%lu total), err=%d\n",
-		       nreal, obj->base.size / PAGE_SIZE, err);
-		goto out;
-	}
-
-	mutex_lock(&i915->drm.struct_mutex);
-	wakeref = intel_runtime_pm_get(i915);
-
-	if (1) {
-		IGT_TIMEOUT(end);
-		struct tile tile;
-
-		tile.height = 1;
-		tile.width = 1;
-		tile.size = 0;
-		tile.stride = 0;
-		tile.swizzle = I915_BIT_6_SWIZZLE_NONE;
-		tile.tiling = I915_TILING_NONE;
-
-		err = check_partial_mapping(obj, &tile, end);
-		if (err && err != -EINTR)
-			goto out_unlock;
-	}
-
-	for (tiling = I915_TILING_X; tiling <= I915_TILING_Y; tiling++) {
-		IGT_TIMEOUT(end);
-		unsigned int max_pitch;
-		unsigned int pitch;
-		struct tile tile;
-
-		if (i915->quirks & QUIRK_PIN_SWIZZLED_PAGES)
-			/*
-			 * The swizzling pattern is actually unknown as it
-			 * varies based on physical address of each page.
-			 * See i915_gem_detect_bit_6_swizzle().
-			 */
-			break;
-
-		tile.tiling = tiling;
-		switch (tiling) {
-		case I915_TILING_X:
-			tile.swizzle = i915->mm.bit_6_swizzle_x;
-			break;
-		case I915_TILING_Y:
-			tile.swizzle = i915->mm.bit_6_swizzle_y;
-			break;
-		}
-
-		GEM_BUG_ON(tile.swizzle == I915_BIT_6_SWIZZLE_UNKNOWN);
-		if (tile.swizzle == I915_BIT_6_SWIZZLE_9_17 ||
-		    tile.swizzle == I915_BIT_6_SWIZZLE_9_10_17)
-			continue;
-
-		if (INTEL_GEN(i915) <= 2) {
-			tile.height = 16;
-			tile.width = 128;
-			tile.size = 11;
-		} else if (tile.tiling == I915_TILING_Y &&
-			   HAS_128_BYTE_Y_TILING(i915)) {
-			tile.height = 32;
-			tile.width = 128;
-			tile.size = 12;
-		} else {
-			tile.height = 8;
-			tile.width = 512;
-			tile.size = 12;
-		}
-
-		if (INTEL_GEN(i915) < 4)
-			max_pitch = 8192 / tile.width;
-		else if (INTEL_GEN(i915) < 7)
-			max_pitch = 128 * I965_FENCE_MAX_PITCH_VAL / tile.width;
-		else
-			max_pitch = 128 * GEN7_FENCE_MAX_PITCH_VAL / tile.width;
-
-		for (pitch = max_pitch; pitch; pitch >>= 1) {
-			tile.stride = tile.width * pitch;
-			err = check_partial_mapping(obj, &tile, end);
-			if (err == -EINTR)
-				goto next_tiling;
-			if (err)
-				goto out_unlock;
-
-			if (pitch > 2 && INTEL_GEN(i915) >= 4) {
-				tile.stride = tile.width * (pitch - 1);
-				err = check_partial_mapping(obj, &tile, end);
-				if (err == -EINTR)
-					goto next_tiling;
-				if (err)
-					goto out_unlock;
-			}
-
-			if (pitch < max_pitch && INTEL_GEN(i915) >= 4) {
-				tile.stride = tile.width * (pitch + 1);
-				err = check_partial_mapping(obj, &tile, end);
-				if (err == -EINTR)
-					goto next_tiling;
-				if (err)
-					goto out_unlock;
-			}
-		}
-
-		if (INTEL_GEN(i915) >= 4) {
-			for_each_prime_number(pitch, max_pitch) {
-				tile.stride = tile.width * pitch;
-				err = check_partial_mapping(obj, &tile, end);
-				if (err == -EINTR)
-					goto next_tiling;
-				if (err)
-					goto out_unlock;
-			}
-		}
-
-next_tiling: ;
-	}
-
-out_unlock:
-	intel_runtime_pm_put(i915, wakeref);
-	mutex_unlock(&i915->drm.struct_mutex);
-	i915_gem_object_unpin_pages(obj);
-out:
-	i915_gem_object_put(obj);
-	return err;
-}
-
-static int make_obj_busy(struct drm_i915_gem_object *obj)
-{
-	struct drm_i915_private *i915 = to_i915(obj->base.dev);
-	struct i915_request *rq;
-	struct i915_vma *vma;
-	int err;
-
-	vma = i915_vma_instance(obj, &i915->ggtt.vm, NULL);
-	if (IS_ERR(vma))
-		return PTR_ERR(vma);
-
-	err = i915_vma_pin(vma, 0, 0, PIN_USER);
-	if (err)
-		return err;
-
-	rq = i915_request_create(i915->engine[RCS0]->kernel_context);
-	if (IS_ERR(rq)) {
-		i915_vma_unpin(vma);
-		return PTR_ERR(rq);
-	}
-
-	err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE);
-
-	i915_request_add(rq);
-
-	__i915_gem_object_release_unless_active(obj);
-	i915_vma_unpin(vma);
-
-	return err;
-}
-
-static bool assert_mmap_offset(struct drm_i915_private *i915,
-			       unsigned long size,
-			       int expected)
-{
-	struct drm_i915_gem_object *obj;
-	int err;
-
-	obj = i915_gem_object_create_internal(i915, size);
-	if (IS_ERR(obj))
-		return PTR_ERR(obj);
-
-	err = i915_gem_object_create_mmap_offset(obj);
-	i915_gem_object_put(obj);
-
-	return err == expected;
-}
-
-static void disable_retire_worker(struct drm_i915_private *i915)
-{
-	i915_gem_shrinker_unregister(i915);
-
-	intel_gt_pm_get(i915);
-
-	cancel_delayed_work_sync(&i915->gem.retire_work);
-	flush_work(&i915->gem.idle_work);
-}
-
-static void restore_retire_worker(struct drm_i915_private *i915)
-{
-	intel_gt_pm_put(i915);
-
-	mutex_lock(&i915->drm.struct_mutex);
-	igt_flush_test(i915, I915_WAIT_LOCKED);
-	mutex_unlock(&i915->drm.struct_mutex);
-
-	i915_gem_shrinker_register(i915);
-}
-
-static int igt_mmap_offset_exhaustion(void *arg)
-{
-	struct drm_i915_private *i915 = arg;
-	struct drm_mm *mm = &i915->drm.vma_offset_manager->vm_addr_space_mm;
-	struct drm_i915_gem_object *obj;
-	struct drm_mm_node resv, *hole;
-	u64 hole_start, hole_end;
-	int loop, err;
-
-	/* Disable background reaper */
-	disable_retire_worker(i915);
-	GEM_BUG_ON(!i915->gt.awake);
-
-	/* Trim the device mmap space to only a page */
-	memset(&resv, 0, sizeof(resv));
-	drm_mm_for_each_hole(hole, mm, hole_start, hole_end) {
-		resv.start = hole_start;
-		resv.size = hole_end - hole_start - 1; /* PAGE_SIZE units */
-		err = drm_mm_reserve_node(mm, &resv);
-		if (err) {
-			pr_err("Failed to trim VMA manager, err=%d\n", err);
-			goto out_park;
-		}
-		break;
-	}
-
-	/* Just fits! */
-	if (!assert_mmap_offset(i915, PAGE_SIZE, 0)) {
-		pr_err("Unable to insert object into single page hole\n");
-		err = -EINVAL;
-		goto out;
-	}
-
-	/* Too large */
-	if (!assert_mmap_offset(i915, 2*PAGE_SIZE, -ENOSPC)) {
-		pr_err("Unexpectedly succeeded in inserting too large object into single page hole\n");
-		err = -EINVAL;
-		goto out;
-	}
-
-	/* Fill the hole, further allocation attempts should then fail */
-	obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
-	if (IS_ERR(obj)) {
-		err = PTR_ERR(obj);
-		goto out;
-	}
-
-	err = i915_gem_object_create_mmap_offset(obj);
-	if (err) {
-		pr_err("Unable to insert object into reclaimed hole\n");
-		goto err_obj;
-	}
-
-	if (!assert_mmap_offset(i915, PAGE_SIZE, -ENOSPC)) {
-		pr_err("Unexpectedly succeeded in inserting object into no holes!\n");
-		err = -EINVAL;
-		goto err_obj;
-	}
-
-	i915_gem_object_put(obj);
-
-	/* Now fill with busy dead objects that we expect to reap */
-	for (loop = 0; loop < 3; loop++) {
-		intel_wakeref_t wakeref;
-
-		if (i915_terminally_wedged(i915))
-			break;
-
-		obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
-		if (IS_ERR(obj)) {
-			err = PTR_ERR(obj);
-			goto out;
-		}
-
-		err = 0;
-		mutex_lock(&i915->drm.struct_mutex);
-		with_intel_runtime_pm(i915, wakeref)
-			err = make_obj_busy(obj);
-		mutex_unlock(&i915->drm.struct_mutex);
-		if (err) {
-			pr_err("[loop %d] Failed to busy the object\n", loop);
-			goto err_obj;
-		}
-
-		/* NB we rely on the _active_ reference to access obj now */
-		GEM_BUG_ON(!i915_gem_object_is_active(obj));
-		err = i915_gem_object_create_mmap_offset(obj);
-		if (err) {
-			pr_err("[loop %d] i915_gem_object_create_mmap_offset failed with err=%d\n",
-			       loop, err);
-			goto out;
-		}
-	}
-
-out:
-	drm_mm_remove_node(&resv);
-out_park:
-	restore_retire_worker(i915);
-	return err;
-err_obj:
-	i915_gem_object_put(obj);
-	goto out;
-}
-
 int i915_gem_object_mock_selftests(void)
 {
 	static const struct i915_subtest tests[] = {
@@ -596,8 +111,6 @@ int i915_gem_object_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
 		SUBTEST(igt_gem_huge),
-		SUBTEST(igt_partial_tiling),
-		SUBTEST(igt_mmap_offset_exhaustion),
 	};
 
 	return i915_subtests(tests, i915);

drivers/gpu/drm/i915/selftests/i915_live_selftests.h

@@ -16,6 +16,7 @@ selftest(timelines, i915_timeline_live_selftests)
 selftest(requests, i915_request_live_selftests)
 selftest(active, i915_active_live_selftests)
 selftest(objects, i915_gem_object_live_selftests)
+selftest(mman, i915_gem_mman_live_selftests)
 selftest(dmabuf, i915_gem_dmabuf_live_selftests)
 selftest(vma, i915_vma_live_selftests)
 selftest(coherency, i915_gem_coherency_live_selftests)