Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2368 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
new file mode 100644
index 0000000000..4008bb09fd
--- /dev/null
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -0,0 +1,2368 @@
+/*
+ * Copyright (c) 2008 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>
+ *    Keith Packard <keithp@keithp.com>
+ *    Mika Kuoppala <mika.kuoppala@intel.com>
+ *
+ */
+
+#include <linux/ascii85.h>
+#include <linux/highmem.h>
+#include <linux/nmi.h>
+#include <linux/pagevec.h>
+#include <linux/scatterlist.h>
+#include <linux/string_helpers.h>
+#include <linux/utsname.h>
+#include <linux/zlib.h>
+
+#include <drm/drm_cache.h>
+#include <drm/drm_print.h>
+
+#include "display/intel_dmc.h"
+#include "display/intel_overlay.h"
+
+#include "gem/i915_gem_context.h"
+#include "gem/i915_gem_lmem.h"
+#include "gt/intel_engine_regs.h"
+#include "gt/intel_gt.h"
+#include "gt/intel_gt_mcr.h"
+#include "gt/intel_gt_pm.h"
+#include "gt/intel_gt_regs.h"
+#include "gt/uc/intel_guc_capture.h"
+
+#include "i915_driver.h"
+#include "i915_drv.h"
+#include "i915_gpu_error.h"
+#include "i915_memcpy.h"
+#include "i915_reg.h"
+#include "i915_scatterlist.h"
+#include "i915_utils.h"
+
+#define ALLOW_FAIL (__GFP_KSWAPD_RECLAIM | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
+#define ATOMIC_MAYFAIL (GFP_ATOMIC | __GFP_NOWARN)
+
+static void __sg_set_buf(struct scatterlist *sg,
+			 void *addr, unsigned int len, loff_t it)
+{
+	sg->page_link = (unsigned long)virt_to_page(addr);
+	sg->offset = offset_in_page(addr);
+	sg->length = len;
+	sg->dma_address = it;
+}
+
+static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
+{
+	if (!len)
+		return false;
+
+	if (e->bytes + len + 1 <= e->size)
+		return true;
+
+	if (e->bytes) {
+		__sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
+		e->iter += e->bytes;
+		e->buf = NULL;
+		e->bytes = 0;
+	}
+
+	if (e->cur == e->end) {
+		struct scatterlist *sgl;
+
+		sgl = (typeof(sgl))__get_free_page(ALLOW_FAIL);
+		if (!sgl) {
+			e->err = -ENOMEM;
+			return false;
+		}
+
+		if (e->cur) {
+			e->cur->offset = 0;
+			e->cur->length = 0;
+			e->cur->page_link =
+				(unsigned long)sgl | SG_CHAIN;
+		} else {
+			e->sgl = sgl;
+		}
+
+		e->cur = sgl;
+		e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
+	}
+
+	e->size = ALIGN(len + 1, SZ_64K);
+	e->buf = kmalloc(e->size, ALLOW_FAIL);
+	if (!e->buf) {
+		e->size = PAGE_ALIGN(len + 1);
+		e->buf = kmalloc(e->size, GFP_KERNEL);
+	}
+	if (!e->buf) {
+		e->err = -ENOMEM;
+		return false;
+	}
+
+	return true;
+}
+
+__printf(2, 0)
+static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
+			       const char *fmt, va_list args)
+{
+	va_list ap;
+	int len;
+
+	if (e->err)
+		return;
+
+	va_copy(ap, args);
+	len = vsnprintf(NULL, 0, fmt, ap);
+	va_end(ap);
+	if (len <= 0) {
+		e->err = len;
+		return;
+	}
+
+	if (!__i915_error_grow(e, len))
+		return;
+
+	GEM_BUG_ON(e->bytes >= e->size);
+	len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
+	if (len < 0) {
+		e->err = len;
+		return;
+	}
+	e->bytes += len;
+}
+
+static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
+{
+	unsigned len;
+
+	if (e->err || !str)
+		return;
+
+	len = strlen(str);
+	if (!__i915_error_grow(e, len))
+		return;
+
+	GEM_BUG_ON(e->bytes + len > e->size);
+	memcpy(e->buf + e->bytes, str, len);
+	e->bytes += len;
+}
+
+#define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
+#define err_puts(e, s) i915_error_puts(e, s)
+
+static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
+{
+	i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
+}
+
+static inline struct drm_printer
+i915_error_printer(struct drm_i915_error_state_buf *e)
+{
+	struct drm_printer p = {
+		.printfn = __i915_printfn_error,
+		.arg = e,
+	};
+	return p;
+}
+
+/* single threaded page allocator with a reserved stash for emergencies */
+static void pool_fini(struct folio_batch *fbatch)
+{
+	folio_batch_release(fbatch);
+}
+
+static int pool_refill(struct folio_batch *fbatch, gfp_t gfp)
+{
+	while (folio_batch_space(fbatch)) {
+		struct folio *folio;
+
+		folio = folio_alloc(gfp, 0);
+		if (!folio)
+			return -ENOMEM;
+
+		folio_batch_add(fbatch, folio);
+	}
+
+	return 0;
+}
+
+static int pool_init(struct folio_batch *fbatch, gfp_t gfp)
+{
+	int err;
+
+	folio_batch_init(fbatch);
+
+	err = pool_refill(fbatch, gfp);
+	if (err)
+		pool_fini(fbatch);
+
+	return err;
+}
+
+static void *pool_alloc(struct folio_batch *fbatch, gfp_t gfp)
+{
+	struct folio *folio;
+
+	folio = folio_alloc(gfp, 0);
+	if (!folio && folio_batch_count(fbatch))
+		folio = fbatch->folios[--fbatch->nr];
+
+	return folio ? folio_address(folio) : NULL;
+}
+
+static void pool_free(struct folio_batch *fbatch, void *addr)
+{
+	struct folio *folio = virt_to_folio(addr);
+
+	if (folio_batch_space(fbatch))
+		folio_batch_add(fbatch, folio);
+	else
+		folio_put(folio);
+}
+
+#ifdef CONFIG_DRM_I915_COMPRESS_ERROR
+
+struct i915_vma_compress {
+	struct folio_batch pool;
+	struct z_stream_s zstream;
+	void *tmp;
+};
+
+static bool compress_init(struct i915_vma_compress *c)
+{
+	struct z_stream_s *zstream = &c->zstream;
+
+	if (pool_init(&c->pool, ALLOW_FAIL))
+		return false;
+
+	zstream->workspace =
+		kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
+			ALLOW_FAIL);
+	if (!zstream->workspace) {
+		pool_fini(&c->pool);
+		return false;
+	}
+
+	c->tmp = NULL;
+	if (i915_has_memcpy_from_wc())
+		c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);
+
+	return true;
+}
+
+static bool compress_start(struct i915_vma_compress *c)
+{
+	struct z_stream_s *zstream = &c->zstream;
+	void *workspace = zstream->workspace;
+
+	memset(zstream, 0, sizeof(*zstream));
+	zstream->workspace = workspace;
+
+	return zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) == Z_OK;
+}
+
+static void *compress_next_page(struct i915_vma_compress *c,
+				struct i915_vma_coredump *dst)
+{
+	void *page_addr;
+	struct page *page;
+
+	page_addr = pool_alloc(&c->pool, ALLOW_FAIL);
+	if (!page_addr)
+		return ERR_PTR(-ENOMEM);
+
+	page = virt_to_page(page_addr);
+	list_add_tail(&page->lru, &dst->page_list);
+	return page_addr;
+}
+
+static int compress_page(struct i915_vma_compress *c,
+			 void *src,
+			 struct i915_vma_coredump *dst,
+			 bool wc)
+{
+	struct z_stream_s *zstream = &c->zstream;
+
+	zstream->next_in = src;
+	if (wc && c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
+		zstream->next_in = c->tmp;
+	zstream->avail_in = PAGE_SIZE;
+
+	do {
+		if (zstream->avail_out == 0) {
+			zstream->next_out = compress_next_page(c, dst);
+			if (IS_ERR(zstream->next_out))
+				return PTR_ERR(zstream->next_out);
+
+			zstream->avail_out = PAGE_SIZE;
+		}
+
+		if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
+			return -EIO;
+
+		cond_resched();
+	} while (zstream->avail_in);
+
+	/* Fallback to uncompressed if we increase size? */
+	if (0 && zstream->total_out > zstream->total_in)
+		return -E2BIG;
+
+	return 0;
+}
+
+static int compress_flush(struct i915_vma_compress *c,
+			  struct i915_vma_coredump *dst)
+{
+	struct z_stream_s *zstream = &c->zstream;
+
+	do {
+		switch (zlib_deflate(zstream, Z_FINISH)) {
+		case Z_OK: /* more space requested */
+			zstream->next_out = compress_next_page(c, dst);
+			if (IS_ERR(zstream->next_out))
+				return PTR_ERR(zstream->next_out);
+
+			zstream->avail_out = PAGE_SIZE;
+			break;
+
+		case Z_STREAM_END:
+			goto end;
+
+		default: /* any error */
+			return -EIO;
+		}
+	} while (1);
+
+end:
+	memset(zstream->next_out, 0, zstream->avail_out);
+	dst->unused = zstream->avail_out;
+	return 0;
+}
+
+static void compress_finish(struct i915_vma_compress *c)
+{
+	zlib_deflateEnd(&c->zstream);
+}
+
+static void compress_fini(struct i915_vma_compress *c)
+{
+	kfree(c->zstream.workspace);
+	if (c->tmp)
+		pool_free(&c->pool, c->tmp);
+	pool_fini(&c->pool);
+}
+
+static void err_compression_marker(struct drm_i915_error_state_buf *m)
+{
+	err_puts(m, ":");
+}
+
+#else
+
+struct i915_vma_compress {
+	struct folio_batch pool;
+};
+
+static bool compress_init(struct i915_vma_compress *c)
+{
+	return pool_init(&c->pool, ALLOW_FAIL) == 0;
+}
+
+static bool compress_start(struct i915_vma_compress *c)
+{
+	return true;
+}
+
+static int compress_page(struct i915_vma_compress *c,
+			 void *src,
+			 struct i915_vma_coredump *dst,
+			 bool wc)
+{
+	void *ptr;
+
+	ptr = pool_alloc(&c->pool, ALLOW_FAIL);
+	if (!ptr)
+		return -ENOMEM;
+
+	if (!(wc && i915_memcpy_from_wc(ptr, src, PAGE_SIZE)))
+		memcpy(ptr, src, PAGE_SIZE);
+	list_add_tail(&virt_to_page(ptr)->lru, &dst->page_list);
+	cond_resched();
+
+	return 0;
+}
+
+static int compress_flush(struct i915_vma_compress *c,
+			  struct i915_vma_coredump *dst)
+{
+	return 0;
+}
+
+static void compress_finish(struct i915_vma_compress *c)
+{
+}
+
+static void compress_fini(struct i915_vma_compress *c)
+{
+	pool_fini(&c->pool);
+}
+
+static void err_compression_marker(struct drm_i915_error_state_buf *m)
+{
+	err_puts(m, "~");
+}
+
+#endif
+
+static void error_print_instdone(struct drm_i915_error_state_buf *m,
+				 const struct intel_engine_coredump *ee)
+{
+	int slice;
+	int subslice;
+	int iter;
+
+	err_printf(m, "  INSTDONE: 0x%08x\n",
+		   ee->instdone.instdone);
+
+	if (ee->engine->class != RENDER_CLASS || GRAPHICS_VER(m->i915) <= 3)
+		return;
+
+	err_printf(m, "  SC_INSTDONE: 0x%08x\n",
+		   ee->instdone.slice_common);
+
+	if (GRAPHICS_VER(m->i915) <= 6)
+		return;
+
+	for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
+		err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
+			   slice, subslice,
+			   ee->instdone.sampler[slice][subslice]);
+
+	for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
+		err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
+			   slice, subslice,
+			   ee->instdone.row[slice][subslice]);
+
+	if (GRAPHICS_VER(m->i915) < 12)
+		return;
+
+	if (GRAPHICS_VER_FULL(m->i915) >= IP_VER(12, 55)) {
+		for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
+			err_printf(m, "  GEOM_SVGUNIT_INSTDONE[%d][%d]: 0x%08x\n",
+				   slice, subslice,
+				   ee->instdone.geom_svg[slice][subslice]);
+	}
+
+	err_printf(m, "  SC_INSTDONE_EXTRA: 0x%08x\n",
+		   ee->instdone.slice_common_extra[0]);
+	err_printf(m, "  SC_INSTDONE_EXTRA2: 0x%08x\n",
+		   ee->instdone.slice_common_extra[1]);
+}
+
+static void error_print_request(struct drm_i915_error_state_buf *m,
+				const char *prefix,
+				const struct i915_request_coredump *erq)
+{
+	if (!erq->seqno)
+		return;
+
+	err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, head %08x, tail %08x\n",
+		   prefix, erq->pid, erq->context, erq->seqno,
+		   test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
+			    &erq->flags) ? "!" : "",
+		   test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
+			    &erq->flags) ? "+" : "",
+		   erq->sched_attr.priority,
+		   erq->head, erq->tail);
+}
+
+static void error_print_context(struct drm_i915_error_state_buf *m,
+				const char *header,
+				const struct i915_gem_context_coredump *ctx)
+{
+	err_printf(m, "%s%s[%d] prio %d, guilty %d active %d, runtime total %lluns, avg %lluns\n",
+		   header, ctx->comm, ctx->pid, ctx->sched_attr.priority,
+		   ctx->guilty, ctx->active,
+		   ctx->total_runtime, ctx->avg_runtime);
+	err_printf(m, "  context timeline seqno %u\n", ctx->hwsp_seqno);
+}
+
+static struct i915_vma_coredump *
+__find_vma(struct i915_vma_coredump *vma, const char *name)
+{
+	while (vma) {
+		if (strcmp(vma->name, name) == 0)
+			return vma;
+		vma = vma->next;
+	}
+
+	return NULL;
+}
+
+struct i915_vma_coredump *
+intel_gpu_error_find_batch(const struct intel_engine_coredump *ee)
+{
+	return __find_vma(ee->vma, "batch");
+}
+
+static void error_print_engine(struct drm_i915_error_state_buf *m,
+			       const struct intel_engine_coredump *ee)
+{
+	struct i915_vma_coredump *batch;
+	int n;
+
+	err_printf(m, "%s command stream:\n", ee->engine->name);
+	err_printf(m, "  CCID:  0x%08x\n", ee->ccid);
+	err_printf(m, "  START: 0x%08x\n", ee->start);
+	err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
+	err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
+		   ee->tail, ee->rq_post, ee->rq_tail);
+	err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
+	err_printf(m, "  MODE:  0x%08x\n", ee->mode);
+	err_printf(m, "  HWS:   0x%08x\n", ee->hws);
+	err_printf(m, "  ACTHD: 0x%08x %08x\n",
+		   (u32)(ee->acthd>>32), (u32)ee->acthd);
+	err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
+	err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
+	err_printf(m, "  ESR:   0x%08x\n", ee->esr);
+
+	error_print_instdone(m, ee);
+
+	batch = intel_gpu_error_find_batch(ee);
+	if (batch) {
+		u64 start = batch->gtt_offset;
+		u64 end = start + batch->gtt_size;
+
+		err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
+			   upper_32_bits(start), lower_32_bits(start),
+			   upper_32_bits(end), lower_32_bits(end));
+	}
+	if (GRAPHICS_VER(m->i915) >= 4) {
+		err_printf(m, "  BBADDR: 0x%08x_%08x\n",
+			   (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
+		err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
+		err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
+	}
+	err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
+	err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
+		   lower_32_bits(ee->faddr));
+	if (GRAPHICS_VER(m->i915) >= 6) {
+		err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
+		err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
+	}
+	if (GRAPHICS_VER(m->i915) >= 11) {
+		err_printf(m, "  NOPID: 0x%08x\n", ee->nopid);
+		err_printf(m, "  EXCC: 0x%08x\n", ee->excc);
+		err_printf(m, "  CMD_CCTL: 0x%08x\n", ee->cmd_cctl);
+		err_printf(m, "  CSCMDOP: 0x%08x\n", ee->cscmdop);
+		err_printf(m, "  CTX_SR_CTL: 0x%08x\n", ee->ctx_sr_ctl);
+		err_printf(m, "  DMA_FADDR_HI: 0x%08x\n", ee->dma_faddr_hi);
+		err_printf(m, "  DMA_FADDR_LO: 0x%08x\n", ee->dma_faddr_lo);
+	}
+	if (HAS_PPGTT(m->i915)) {
+		err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
+
+		if (GRAPHICS_VER(m->i915) >= 8) {
+			int i;
+			for (i = 0; i < 4; i++)
+				err_printf(m, "  PDP%d: 0x%016llx\n",
+					   i, ee->vm_info.pdp[i]);
+		} else {
+			err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
+				   ee->vm_info.pp_dir_base);
+		}
+	}
+
+	for (n = 0; n < ee->num_ports; n++) {
+		err_printf(m, "  ELSP[%d]:", n);
+		error_print_request(m, " ", &ee->execlist[n]);
+	}
+}
+
+void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
+{
+	va_list args;
+
+	va_start(args, f);
+	i915_error_vprintf(e, f, args);
+	va_end(args);
+}
+
+void intel_gpu_error_print_vma(struct drm_i915_error_state_buf *m,
+			       const struct intel_engine_cs *engine,
+			       const struct i915_vma_coredump *vma)
+{
+	char out[ASCII85_BUFSZ];
+	struct page *page;
+
+	if (!vma)
+		return;
+
+	err_printf(m, "%s --- %s = 0x%08x %08x\n",
+		   engine ? engine->name : "global", vma->name,
+		   upper_32_bits(vma->gtt_offset),
+		   lower_32_bits(vma->gtt_offset));
+
+	if (vma->gtt_page_sizes > I915_GTT_PAGE_SIZE_4K)
+		err_printf(m, "gtt_page_sizes = 0x%08x\n", vma->gtt_page_sizes);
+
+	err_compression_marker(m);
+	list_for_each_entry(page, &vma->page_list, lru) {
+		int i, len;
+		const u32 *addr = page_address(page);
+
+		len = PAGE_SIZE;
+		if (page == list_last_entry(&vma->page_list, typeof(*page), lru))
+			len -= vma->unused;
+		len = ascii85_encode_len(len);
+
+		for (i = 0; i < len; i++)
+			err_puts(m, ascii85_encode(addr[i], out));
+	}
+	err_puts(m, "\n");
+}
+
+static void err_print_capabilities(struct drm_i915_error_state_buf *m,
+				   struct i915_gpu_coredump *error)
+{
+	struct drm_printer p = i915_error_printer(m);
+
+	intel_device_info_print(&error->device_info, &error->runtime_info, &p);
+	intel_display_device_info_print(&error->display_device_info,
+					&error->display_runtime_info, &p);
+	intel_driver_caps_print(&error->driver_caps, &p);
+}
+
+static void err_print_params(struct drm_i915_error_state_buf *m,
+			     const struct i915_params *params)
+{
+	struct drm_printer p = i915_error_printer(m);
+
+	i915_params_dump(params, &p);
+}
+
+static void err_print_pciid(struct drm_i915_error_state_buf *m,
+			    struct drm_i915_private *i915)
+{
+	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
+
+	err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
+	err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
+	err_printf(m, "PCI Subsystem: %04x:%04x\n",
+		   pdev->subsystem_vendor,
+		   pdev->subsystem_device);
+}
+
+static void err_print_guc_ctb(struct drm_i915_error_state_buf *m,
+			      const char *name,
+			      const struct intel_ctb_coredump *ctb)
+{
+	if (!ctb->size)
+		return;
+
+	err_printf(m, "GuC %s CTB: raw: 0x%08X, 0x%08X/%08X, cached: 0x%08X/%08X, desc = 0x%08X, buf = 0x%08X x 0x%08X\n",
+		   name, ctb->raw_status, ctb->raw_head, ctb->raw_tail,
+		   ctb->head, ctb->tail, ctb->desc_offset, ctb->cmds_offset, ctb->size);
+}
+
+static void err_print_uc(struct drm_i915_error_state_buf *m,
+			 const struct intel_uc_coredump *error_uc)
+{
+	struct drm_printer p = i915_error_printer(m);
+
+	intel_uc_fw_dump(&error_uc->guc_fw, &p);
+	intel_uc_fw_dump(&error_uc->huc_fw, &p);
+	err_printf(m, "GuC timestamp: 0x%08x\n", error_uc->guc.timestamp);
+	intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_log);
+	err_printf(m, "GuC CTB fence: %d\n", error_uc->guc.last_fence);
+	err_print_guc_ctb(m, "Send", error_uc->guc.ctb + 0);
+	err_print_guc_ctb(m, "Recv", error_uc->guc.ctb + 1);
+	intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_ctb);
+}
+
+static void err_free_sgl(struct scatterlist *sgl)
+{
+	while (sgl) {
+		struct scatterlist *sg;
+
+		for (sg = sgl; !sg_is_chain(sg); sg++) {
+			kfree(sg_virt(sg));
+			if (sg_is_last(sg))
+				break;
+		}
+
+		sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
+		free_page((unsigned long)sgl);
+		sgl = sg;
+	}
+}
+
+static void err_print_gt_info(struct drm_i915_error_state_buf *m,
+			      struct intel_gt_coredump *gt)
+{
+	struct drm_printer p = i915_error_printer(m);
+
+	intel_gt_info_print(&gt->info, &p);
+	intel_sseu_print_topology(gt->_gt->i915, &gt->info.sseu, &p);
+}
+
+static void err_print_gt_display(struct drm_i915_error_state_buf *m,
+				 struct intel_gt_coredump *gt)
+{
+	err_printf(m, "IER: 0x%08x\n", gt->ier);
+	err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
+}
+
+static void err_print_gt_global_nonguc(struct drm_i915_error_state_buf *m,
+				       struct intel_gt_coredump *gt)
+{
+	int i;
+
+	err_printf(m, "GT awake: %s\n", str_yes_no(gt->awake));
+	err_printf(m, "CS timestamp frequency: %u Hz, %d ns\n",
+		   gt->clock_frequency, gt->clock_period_ns);
+	err_printf(m, "EIR: 0x%08x\n", gt->eir);
+	err_printf(m, "PGTBL_ER: 0x%08x\n", gt->pgtbl_er);
+
+	for (i = 0; i < gt->ngtier; i++)
+		err_printf(m, "GTIER[%d]: 0x%08x\n", i, gt->gtier[i]);
+}
+
+static void err_print_gt_global(struct drm_i915_error_state_buf *m,
+				struct intel_gt_coredump *gt)
+{
+	err_printf(m, "FORCEWAKE: 0x%08x\n", gt->forcewake);
+
+	if (IS_GRAPHICS_VER(m->i915, 6, 11)) {
+		err_printf(m, "ERROR: 0x%08x\n", gt->error);
+		err_printf(m, "DONE_REG: 0x%08x\n", gt->done_reg);
+	}
+
+	if (GRAPHICS_VER(m->i915) >= 8)
+		err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
+			   gt->fault_data1, gt->fault_data0);
+
+	if (GRAPHICS_VER(m->i915) == 7)
+		err_printf(m, "ERR_INT: 0x%08x\n", gt->err_int);
+
+	if (IS_GRAPHICS_VER(m->i915, 8, 11))
+		err_printf(m, "GTT_CACHE_EN: 0x%08x\n", gt->gtt_cache);
+
+	if (GRAPHICS_VER(m->i915) == 12)
+		err_printf(m, "AUX_ERR_DBG: 0x%08x\n", gt->aux_err);
+
+	if (GRAPHICS_VER(m->i915) >= 12) {
+		int i;
+
+		for (i = 0; i < I915_MAX_SFC; i++) {
+			/*
+			 * SFC_DONE resides in the VD forcewake domain, so it
+			 * only exists if the corresponding VCS engine is
+			 * present.
+			 */
+			if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
+			    !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
+				continue;
+
+			err_printf(m, "  SFC_DONE[%d]: 0x%08x\n", i,
+				   gt->sfc_done[i]);
+		}
+
+		err_printf(m, "  GAM_DONE: 0x%08x\n", gt->gam_done);
+	}
+}
+
+static void err_print_gt_fences(struct drm_i915_error_state_buf *m,
+				struct intel_gt_coredump *gt)
+{
+	int i;
+
+	for (i = 0; i < gt->nfence; i++)
+		err_printf(m, "  fence[%d] = %08llx\n", i, gt->fence[i]);
+}
+
+static void err_print_gt_engines(struct drm_i915_error_state_buf *m,
+				 struct intel_gt_coredump *gt)
+{
+	const struct intel_engine_coredump *ee;
+
+	for (ee = gt->engine; ee; ee = ee->next) {
+		const struct i915_vma_coredump *vma;
+
+		if (gt->uc && gt->uc->guc.is_guc_capture) {
+			if (ee->guc_capture_node)
+				intel_guc_capture_print_engine_node(m, ee);
+			else
+				err_printf(m, "  Missing GuC capture node for %s\n",
+					   ee->engine->name);
+		} else {
+			error_print_engine(m, ee);
+		}
+
+		err_printf(m, "  hung: %u\n", ee->hung);
+		err_printf(m, "  engine reset count: %u\n", ee->reset_count);
+		error_print_context(m, "  Active context: ", &ee->context);
+
+		for (vma = ee->vma; vma; vma = vma->next)
+			intel_gpu_error_print_vma(m, ee->engine, vma);
+	}
+
+}
+
+static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
+			       struct i915_gpu_coredump *error)
+{
+	const struct intel_engine_coredump *ee;
+	struct timespec64 ts;
+
+	if (*error->error_msg)
+		err_printf(m, "%s\n", error->error_msg);
+	err_printf(m, "Kernel: %s %s\n",
+		   init_utsname()->release,
+		   init_utsname()->machine);
+	err_printf(m, "Driver: %s\n", DRIVER_DATE);
+	ts = ktime_to_timespec64(error->time);
+	err_printf(m, "Time: %lld s %ld us\n",
+		   (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
+	ts = ktime_to_timespec64(error->boottime);
+	err_printf(m, "Boottime: %lld s %ld us\n",
+		   (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
+	ts = ktime_to_timespec64(error->uptime);
+	err_printf(m, "Uptime: %lld s %ld us\n",
+		   (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
+	err_printf(m, "Capture: %lu jiffies; %d ms ago\n",
+		   error->capture, jiffies_to_msecs(jiffies - error->capture));
+
+	for (ee = error->gt ? error->gt->engine : NULL; ee; ee = ee->next)
+		err_printf(m, "Active process (on ring %s): %s [%d]\n",
+			   ee->engine->name,
+			   ee->context.comm,
+			   ee->context.pid);
+
+	err_printf(m, "Reset count: %u\n", error->reset_count);
+	err_printf(m, "Suspend count: %u\n", error->suspend_count);
+	err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
+	err_printf(m, "Subplatform: 0x%x\n",
+		   intel_subplatform(&error->runtime_info,
+				     error->device_info.platform));
+	err_print_pciid(m, m->i915);
+
+	err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
+
+	intel_dmc_print_error_state(m, m->i915);
+
+	err_printf(m, "RPM wakelock: %s\n", str_yes_no(error->wakelock));
+	err_printf(m, "PM suspended: %s\n", str_yes_no(error->suspended));
+
+	if (error->gt) {
+		bool print_guc_capture = false;
+
+		if (error->gt->uc && error->gt->uc->guc.is_guc_capture)
+			print_guc_capture = true;
+
+		err_print_gt_display(m, error->gt);
+		err_print_gt_global_nonguc(m, error->gt);
+		err_print_gt_fences(m, error->gt);
+
+		/*
+		 * GuC dumped global, eng-class and eng-instance registers together
+		 * as part of engine state dump so we print in err_print_gt_engines
+		 */
+		if (!print_guc_capture)
+			err_print_gt_global(m, error->gt);
+
+		err_print_gt_engines(m, error->gt);
+
+		if (error->gt->uc)
+			err_print_uc(m, error->gt->uc);
+
+		err_print_gt_info(m, error->gt);
+	}
+
+	if (error->overlay)
+		intel_overlay_print_error_state(m, error->overlay);
+
+	err_print_capabilities(m, error);
+	err_print_params(m, &error->params);
+}
+
+static int err_print_to_sgl(struct i915_gpu_coredump *error)
+{
+	struct drm_i915_error_state_buf m;
+
+	if (IS_ERR(error))
+		return PTR_ERR(error);
+
+	if (READ_ONCE(error->sgl))
+		return 0;
+
+	memset(&m, 0, sizeof(m));
+	m.i915 = error->i915;
+
+	__err_print_to_sgl(&m, error);
+
+	if (m.buf) {
+		__sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
+		m.bytes = 0;
+		m.buf = NULL;
+	}
+	if (m.cur) {
+		GEM_BUG_ON(m.end < m.cur);
+		sg_mark_end(m.cur - 1);
+	}
+	GEM_BUG_ON(m.sgl && !m.cur);
+
+	if (m.err) {
+		err_free_sgl(m.sgl);
+		return m.err;
+	}
+
+	if (cmpxchg(&error->sgl, NULL, m.sgl))
+		err_free_sgl(m.sgl);
+
+	return 0;
+}
+
+ssize_t i915_gpu_coredump_copy_to_buffer(struct i915_gpu_coredump *error,
+					 char *buf, loff_t off, size_t rem)
+{
+	struct scatterlist *sg;
+	size_t count;
+	loff_t pos;
+	int err;
+
+	if (!error || !rem)
+		return 0;
+
+	err = err_print_to_sgl(error);
+	if (err)
+		return err;
+
+	sg = READ_ONCE(error->fit);
+	if (!sg || off < sg->dma_address)
+		sg = error->sgl;
+	if (!sg)
+		return 0;
+
+	pos = sg->dma_address;
+	count = 0;
+	do {
+		size_t len, start;
+
+		if (sg_is_chain(sg)) {
+			sg = sg_chain_ptr(sg);
+			GEM_BUG_ON(sg_is_chain(sg));
+		}
+
+		len = sg->length;
+		if (pos + len <= off) {
+			pos += len;
+			continue;
+		}
+
+		start = sg->offset;
+		if (pos < off) {
+			GEM_BUG_ON(off - pos > len);
+			len -= off - pos;
+			start += off - pos;
+			pos = off;
+		}
+
+		len = min(len, rem);
+		GEM_BUG_ON(!len || len > sg->length);
+
+		memcpy(buf, page_address(sg_page(sg)) + start, len);
+
+		count += len;
+		pos += len;
+
+		buf += len;
+		rem -= len;
+		if (!rem) {
+			WRITE_ONCE(error->fit, sg);
+			break;
+		}
+	} while (!sg_is_last(sg++));
+
+	return count;
+}
+
+static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
+{
+	while (vma) {
+		struct i915_vma_coredump *next = vma->next;
+		struct page *page, *n;
+
+		list_for_each_entry_safe(page, n, &vma->page_list, lru) {
+			list_del_init(&page->lru);
+			__free_page(page);
+		}
+
+		kfree(vma);
+		vma = next;
+	}
+}
+
+static void cleanup_params(struct i915_gpu_coredump *error)
+{
+	i915_params_free(&error->params);
+}
+
+static void cleanup_uc(struct intel_uc_coredump *uc)
+{
+	kfree(uc->guc_fw.file_selected.path);
+	kfree(uc->huc_fw.file_selected.path);
+	kfree(uc->guc_fw.file_wanted.path);
+	kfree(uc->huc_fw.file_wanted.path);
+	i915_vma_coredump_free(uc->guc.vma_log);
+	i915_vma_coredump_free(uc->guc.vma_ctb);
+
+	kfree(uc);
+}
+
+static void cleanup_gt(struct intel_gt_coredump *gt)
+{
+	while (gt->engine) {
+		struct intel_engine_coredump *ee = gt->engine;
+
+		gt->engine = ee->next;
+
+		i915_vma_coredump_free(ee->vma);
+		intel_guc_capture_free_node(ee);
+		kfree(ee);
+	}
+
+	if (gt->uc)
+		cleanup_uc(gt->uc);
+
+	kfree(gt);
+}
+
+void __i915_gpu_coredump_free(struct kref *error_ref)
+{
+	struct i915_gpu_coredump *error =
+		container_of(error_ref, typeof(*error), ref);
+
+	while (error->gt) {
+		struct intel_gt_coredump *gt = error->gt;
+
+		error->gt = gt->next;
+		cleanup_gt(gt);
+	}
+
+	kfree(error->overlay);
+
+	cleanup_params(error);
+
+	err_free_sgl(error->sgl);
+	kfree(error);
+}
+
+static struct i915_vma_coredump *
+i915_vma_coredump_create(const struct intel_gt *gt,
+			 const struct i915_vma_resource *vma_res,
+			 struct i915_vma_compress *compress,
+			 const char *name)
+
+{
+	struct i915_ggtt *ggtt = gt->ggtt;
+	const u64 slot = ggtt->error_capture.start;
+	struct i915_vma_coredump *dst;
+	struct sgt_iter iter;
+	int ret;
+
+	might_sleep();
+
+	if (!vma_res || !vma_res->bi.pages || !compress)
+		return NULL;
+
+	dst = kmalloc(sizeof(*dst), ALLOW_FAIL);
+	if (!dst)
+		return NULL;
+
+	if (!compress_start(compress)) {
+		kfree(dst);
+		return NULL;
+	}
+
+	INIT_LIST_HEAD(&dst->page_list);
+	strcpy(dst->name, name);
+	dst->next = NULL;
+
+	dst->gtt_offset = vma_res->start;
+	dst->gtt_size = vma_res->node_size;
+	dst->gtt_page_sizes = vma_res->page_sizes_gtt;
+	dst->unused = 0;
+
+	ret = -EINVAL;
+	if (drm_mm_node_allocated(&ggtt->error_capture)) {
+		void __iomem *s;
+		dma_addr_t dma;
+
+		for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
+			mutex_lock(&ggtt->error_mutex);
+			if (ggtt->vm.raw_insert_page)
+				ggtt->vm.raw_insert_page(&ggtt->vm, dma, slot,
+							 i915_gem_get_pat_index(gt->i915,
+										I915_CACHE_NONE),
+							 0);
+			else
+				ggtt->vm.insert_page(&ggtt->vm, dma, slot,
+						     i915_gem_get_pat_index(gt->i915,
+									    I915_CACHE_NONE),
+						     0);
+			mb();
+
+			s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
+			ret = compress_page(compress,
+					    (void  __force *)s, dst,
+					    true);
+			io_mapping_unmap(s);
+
+			mb();
+			ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
+			mutex_unlock(&ggtt->error_mutex);
+			if (ret)
+				break;
+		}
+	} else if (vma_res->bi.lmem) {
+		struct intel_memory_region *mem = vma_res->mr;
+		dma_addr_t dma;
+
+		for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
+			dma_addr_t offset = dma - mem->region.start;
+			void __iomem *s;
+
+			if (offset + PAGE_SIZE > mem->io_size) {
+				ret = -EINVAL;
+				break;
+			}
+
+			s = io_mapping_map_wc(&mem->iomap, offset, PAGE_SIZE);
+			ret = compress_page(compress,
+					    (void __force *)s, dst,
+					    true);
+			io_mapping_unmap(s);
+			if (ret)
+				break;
+		}
+	} else {
+		struct page *page;
+
+		for_each_sgt_page(page, iter, vma_res->bi.pages) {
+			void *s;
+
+			drm_clflush_pages(&page, 1);
+
+			s = kmap_local_page(page);
+			ret = compress_page(compress, s, dst, false);
+			kunmap_local(s);
+
+			drm_clflush_pages(&page, 1);
+
+			if (ret)
+				break;
+		}
+	}
+
+	if (ret || compress_flush(compress, dst)) {
+		struct page *page, *n;
+
+		list_for_each_entry_safe_reverse(page, n, &dst->page_list, lru) {
+			list_del_init(&page->lru);
+			pool_free(&compress->pool, page_address(page));
+		}
+
+		kfree(dst);
+		dst = NULL;
+	}
+	compress_finish(compress);
+
+	return dst;
+}
+
+static void gt_record_fences(struct intel_gt_coredump *gt)
+{
+	struct i915_ggtt *ggtt = gt->_gt->ggtt;
+	struct intel_uncore *uncore = gt->_gt->uncore;
+	int i;
+
+	if (GRAPHICS_VER(uncore->i915) >= 6) {
+		for (i = 0; i < ggtt->num_fences; i++)
+			gt->fence[i] =
+				intel_uncore_read64(uncore,
+						    FENCE_REG_GEN6_LO(i));
+	} else if (GRAPHICS_VER(uncore->i915) >= 4) {
+		for (i = 0; i < ggtt->num_fences; i++)
+			gt->fence[i] =
+				intel_uncore_read64(uncore,
+						    FENCE_REG_965_LO(i));
+	} else {
+		for (i = 0; i < ggtt->num_fences; i++)
+			gt->fence[i] =
+				intel_uncore_read(uncore, FENCE_REG(i));
+	}
+	gt->nfence = i;
+}
+
+static void engine_record_registers(struct intel_engine_coredump *ee)
+{
+	const struct intel_engine_cs *engine = ee->engine;
+	struct drm_i915_private *i915 = engine->i915;
+
+	if (GRAPHICS_VER(i915) >= 6) {
+		ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
+
+		if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
+			ee->fault_reg = intel_gt_mcr_read_any(engine->gt,
+							      XEHP_RING_FAULT_REG);
+		else if (GRAPHICS_VER(i915) >= 12)
+			ee->fault_reg = intel_uncore_read(engine->uncore,
+							  GEN12_RING_FAULT_REG);
+		else if (GRAPHICS_VER(i915) >= 8)
+			ee->fault_reg = intel_uncore_read(engine->uncore,
+							  GEN8_RING_FAULT_REG);
+		else
+			ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
+	}
+
+	if (GRAPHICS_VER(i915) >= 4) {
+		ee->esr = ENGINE_READ(engine, RING_ESR);
+		ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
+		ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
+		ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
+		ee->instps = ENGINE_READ(engine, RING_INSTPS);
+		ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
+		ee->ccid = ENGINE_READ(engine, CCID);
+		if (GRAPHICS_VER(i915) >= 8) {
+			ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
+			ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
+		}
+		ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
+	} else {
+		ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
+		ee->ipeir = ENGINE_READ(engine, IPEIR);
+		ee->ipehr = ENGINE_READ(engine, IPEHR);
+	}
+
+	if (GRAPHICS_VER(i915) >= 11) {
+		ee->cmd_cctl = ENGINE_READ(engine, RING_CMD_CCTL);
+		ee->cscmdop = ENGINE_READ(engine, RING_CSCMDOP);
+		ee->ctx_sr_ctl = ENGINE_READ(engine, RING_CTX_SR_CTL);
+		ee->dma_faddr_hi = ENGINE_READ(engine, RING_DMA_FADD_UDW);
+		ee->dma_faddr_lo = ENGINE_READ(engine, RING_DMA_FADD);
+		ee->nopid = ENGINE_READ(engine, RING_NOPID);
+		ee->excc = ENGINE_READ(engine, RING_EXCC);
+	}
+
+	intel_engine_get_instdone(engine, &ee->instdone);
+
+	ee->instpm = ENGINE_READ(engine, RING_INSTPM);
+	ee->acthd = intel_engine_get_active_head(engine);
+	ee->start = ENGINE_READ(engine, RING_START);
+	ee->head = ENGINE_READ(engine, RING_HEAD);
+	ee->tail = ENGINE_READ(engine, RING_TAIL);
+	ee->ctl = ENGINE_READ(engine, RING_CTL);
+	if (GRAPHICS_VER(i915) > 2)
+		ee->mode = ENGINE_READ(engine, RING_MI_MODE);
+
+	if (!HWS_NEEDS_PHYSICAL(i915)) {
+		i915_reg_t mmio;
+
+		if (GRAPHICS_VER(i915) == 7) {
+			switch (engine->id) {
+			default:
+				MISSING_CASE(engine->id);
+				fallthrough;
+			case RCS0:
+				mmio = RENDER_HWS_PGA_GEN7;
+				break;
+			case BCS0:
+				mmio = BLT_HWS_PGA_GEN7;
+				break;
+			case VCS0:
+				mmio = BSD_HWS_PGA_GEN7;
+				break;
+			case VECS0:
+				mmio = VEBOX_HWS_PGA_GEN7;
+				break;
+			}
+		} else if (GRAPHICS_VER(engine->i915) == 6) {
+			mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
+		} else {
+			/* XXX: gen8 returns to sanity */
+			mmio = RING_HWS_PGA(engine->mmio_base);
+		}
+
+		ee->hws = intel_uncore_read(engine->uncore, mmio);
+	}
+
+	ee->reset_count = i915_reset_engine_count(&i915->gpu_error, engine);
+
+	if (HAS_PPGTT(i915)) {
+		int i;
+
+		ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
+
+		if (GRAPHICS_VER(i915) == 6) {
+			ee->vm_info.pp_dir_base =
+				ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
+		} else if (GRAPHICS_VER(i915) == 7) {
+			ee->vm_info.pp_dir_base =
+				ENGINE_READ(engine, RING_PP_DIR_BASE);
+		} else if (GRAPHICS_VER(i915) >= 8) {
+			u32 base = engine->mmio_base;
+
+			for (i = 0; i < 4; i++) {
+				ee->vm_info.pdp[i] =
+					intel_uncore_read(engine->uncore,
+							  GEN8_RING_PDP_UDW(base, i));
+				ee->vm_info.pdp[i] <<= 32;
+				ee->vm_info.pdp[i] |=
+					intel_uncore_read(engine->uncore,
+							  GEN8_RING_PDP_LDW(base, i));
+			}
+		}
+	}
+}
+
+static void record_request(const struct i915_request *request,
+			   struct i915_request_coredump *erq)
+{
+	erq->flags = request->fence.flags;
+	erq->context = request->fence.context;
+	erq->seqno = request->fence.seqno;
+	erq->sched_attr = request->sched.attr;
+	erq->head = request->head;
+	erq->tail = request->tail;
+
+	erq->pid = 0;
+	rcu_read_lock();
+	if (!intel_context_is_closed(request->context)) {
+		const struct i915_gem_context *ctx;
+
+		ctx = rcu_dereference(request->context->gem_context);
+		if (ctx)
+			erq->pid = pid_nr(ctx->pid);
+	}
+	rcu_read_unlock();
+}
+
+static void engine_record_execlists(struct intel_engine_coredump *ee)
+{
+	const struct intel_engine_execlists * const el = &ee->engine->execlists;
+	struct i915_request * const *port = el->active;
+	unsigned int n = 0;
+
+	while (*port)
+		record_request(*port++, &ee->execlist[n++]);
+
+	ee->num_ports = n;
+}
+
+static bool record_context(struct i915_gem_context_coredump *e,
+			   struct intel_context *ce)
+{
+	struct i915_gem_context *ctx;
+	struct task_struct *task;
+	bool simulated;
+
+	rcu_read_lock();
+	ctx = rcu_dereference(ce->gem_context);
+	if (ctx && !kref_get_unless_zero(&ctx->ref))
+		ctx = NULL;
+	rcu_read_unlock();
+	if (!ctx)
+		return true;
+
+	rcu_read_lock();
+	task = pid_task(ctx->pid, PIDTYPE_PID);
+	if (task) {
+		strcpy(e->comm, task->comm);
+		e->pid = task->pid;
+	}
+	rcu_read_unlock();
+
+	e->sched_attr = ctx->sched;
+	e->guilty = atomic_read(&ctx->guilty_count);
+	e->active = atomic_read(&ctx->active_count);
+	e->hwsp_seqno = (ce->timeline && ce->timeline->hwsp_seqno) ?
+				*ce->timeline->hwsp_seqno : ~0U;
+
+	e->total_runtime = intel_context_get_total_runtime_ns(ce);
+	e->avg_runtime = intel_context_get_avg_runtime_ns(ce);
+
+	simulated = i915_gem_context_no_error_capture(ctx);
+
+	i915_gem_context_put(ctx);
+	return simulated;
+}
+
+struct intel_engine_capture_vma {
+	struct intel_engine_capture_vma *next;
+	struct i915_vma_resource *vma_res;
+	char name[16];
+	bool lockdep_cookie;
+};
+
+static struct intel_engine_capture_vma *
+capture_vma_snapshot(struct intel_engine_capture_vma *next,
+		     struct i915_vma_resource *vma_res,
+		     gfp_t gfp, const char *name)
+{
+	struct intel_engine_capture_vma *c;
+
+	if (!vma_res)
+		return next;
+
+	c = kmalloc(sizeof(*c), gfp);
+	if (!c)
+		return next;
+
+	if (!i915_vma_resource_hold(vma_res, &c->lockdep_cookie)) {
+		kfree(c);
+		return next;
+	}
+
+	strcpy(c->name, name);
+	c->vma_res = i915_vma_resource_get(vma_res);
+
+	c->next = next;
+	return c;
+}
+
+static struct intel_engine_capture_vma *
+capture_vma(struct intel_engine_capture_vma *next,
+	    struct i915_vma *vma,
+	    const char *name,
+	    gfp_t gfp)
+{
+	if (!vma)
+		return next;
+
+	/*
+	 * If the vma isn't pinned, then the vma should be snapshotted
+	 * to a struct i915_vma_snapshot at command submission time.
+	 * Not here.
+	 */
+	if (GEM_WARN_ON(!i915_vma_is_pinned(vma)))
+		return next;
+
+	next = capture_vma_snapshot(next, vma->resource, gfp, name);
+
+	return next;
+}
+
+static struct intel_engine_capture_vma *
+capture_user(struct intel_engine_capture_vma *capture,
+	     const struct i915_request *rq,
+	     gfp_t gfp)
+{
+	struct i915_capture_list *c;
+
+	for (c = rq->capture_list; c; c = c->next)
+		capture = capture_vma_snapshot(capture, c->vma_res, gfp,
+					       "user");
+
+	return capture;
+}
+
+static void add_vma(struct intel_engine_coredump *ee,
+		    struct i915_vma_coredump *vma)
+{
+	if (vma) {
+		vma->next = ee->vma;
+		ee->vma = vma;
+	}
+}
+
+static struct i915_vma_coredump *
+create_vma_coredump(const struct intel_gt *gt, struct i915_vma *vma,
+		    const char *name, struct i915_vma_compress *compress)
+{
+	struct i915_vma_coredump *ret = NULL;
+	struct i915_vma_resource *vma_res;
+	bool lockdep_cookie;
+
+	if (!vma)
+		return NULL;
+
+	vma_res = vma->resource;
+
+	if (i915_vma_resource_hold(vma_res, &lockdep_cookie)) {
+		ret = i915_vma_coredump_create(gt, vma_res, compress, name);
+		i915_vma_resource_unhold(vma_res, lockdep_cookie);
+	}
+
+	return ret;
+}
+
+static void add_vma_coredump(struct intel_engine_coredump *ee,
+			     const struct intel_gt *gt,
+			     struct i915_vma *vma,
+			     const char *name,
+			     struct i915_vma_compress *compress)
+{
+	add_vma(ee, create_vma_coredump(gt, vma, name, compress));
+}
+
+struct intel_engine_coredump *
+intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp, u32 dump_flags)
+{
+	struct intel_engine_coredump *ee;
+
+	ee = kzalloc(sizeof(*ee), gfp);
+	if (!ee)
+		return NULL;
+
+	ee->engine = engine;
+
+	if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)) {
+		engine_record_registers(ee);
+		engine_record_execlists(ee);
+	}
+
+	return ee;
+}
+
+static struct intel_engine_capture_vma *
+engine_coredump_add_context(struct intel_engine_coredump *ee,
+			    struct intel_context *ce,
+			    gfp_t gfp)
+{
+	struct intel_engine_capture_vma *vma = NULL;
+
+	ee->simulated |= record_context(&ee->context, ce);
+	if (ee->simulated)
+		return NULL;
+
+	/*
+	 * We need to copy these to an anonymous buffer
+	 * as the simplest method to avoid being overwritten
+	 * by userspace.
+	 */
+	vma = capture_vma(vma, ce->ring->vma, "ring", gfp);
+	vma = capture_vma(vma, ce->state, "HW context", gfp);
+
+	return vma;
+}
+
+struct intel_engine_capture_vma *
+intel_engine_coredump_add_request(struct intel_engine_coredump *ee,
+				  struct i915_request *rq,
+				  gfp_t gfp)
+{
+	struct intel_engine_capture_vma *vma;
+
+	vma = engine_coredump_add_context(ee, rq->context, gfp);
+	if (!vma)
+		return NULL;
+
+	/*
+	 * We need to copy these to an anonymous buffer
+	 * as the simplest method to avoid being overwritten
+	 * by userspace.
+	 */
+	vma = capture_vma_snapshot(vma, rq->batch_res, gfp, "batch");
+	vma = capture_user(vma, rq, gfp);
+
+	ee->rq_head = rq->head;
+	ee->rq_post = rq->postfix;
+	ee->rq_tail = rq->tail;
+
+	return vma;
+}
+
+void
+intel_engine_coredump_add_vma(struct intel_engine_coredump *ee,
+			      struct intel_engine_capture_vma *capture,
+			      struct i915_vma_compress *compress)
+{
+	const struct intel_engine_cs *engine = ee->engine;
+
+	while (capture) {
+		struct intel_engine_capture_vma *this = capture;
+		struct i915_vma_resource *vma_res = this->vma_res;
+
+		add_vma(ee,
+			i915_vma_coredump_create(engine->gt, vma_res,
+						 compress, this->name));
+
+		i915_vma_resource_unhold(vma_res, this->lockdep_cookie);
+		i915_vma_resource_put(vma_res);
+
+		capture = this->next;
+		kfree(this);
+	}
+
+	add_vma_coredump(ee, engine->gt, engine->status_page.vma,
+			 "HW Status", compress);
+
+	add_vma_coredump(ee, engine->gt, engine->wa_ctx.vma,
+			 "WA context", compress);
+}
+
+static struct intel_engine_coredump *
+capture_engine(struct intel_engine_cs *engine,
+	       struct i915_vma_compress *compress,
+	       u32 dump_flags)
+{
+	struct intel_engine_capture_vma *capture = NULL;
+	struct intel_engine_coredump *ee;
+	struct intel_context *ce = NULL;
+	struct i915_request *rq = NULL;
+
+	ee = intel_engine_coredump_alloc(engine, ALLOW_FAIL, dump_flags);
+	if (!ee)
+		return NULL;
+
+	intel_engine_get_hung_entity(engine, &ce, &rq);
+	if (rq && !i915_request_started(rq))
+		drm_info(&engine->gt->i915->drm, "Got hung context on %s with active request %lld:%lld [0x%04X] not yet started\n",
+			 engine->name, rq->fence.context, rq->fence.seqno, ce->guc_id.id);
+
+	if (rq) {
+		capture = intel_engine_coredump_add_request(ee, rq, ATOMIC_MAYFAIL);
+		i915_request_put(rq);
+	} else if (ce) {
+		capture = engine_coredump_add_context(ee, ce, ATOMIC_MAYFAIL);
+	}
+
+	if (capture) {
+		intel_engine_coredump_add_vma(ee, capture, compress);
+
+		if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
+			intel_guc_capture_get_matching_node(engine->gt, ee, ce);
+	} else {
+		kfree(ee);
+		ee = NULL;
+	}
+
+	return ee;
+}
+
+static void
+gt_record_engines(struct intel_gt_coredump *gt,
+		  intel_engine_mask_t engine_mask,
+		  struct i915_vma_compress *compress,
+		  u32 dump_flags)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+
+	for_each_engine(engine, gt->_gt, id) {
+		struct intel_engine_coredump *ee;
+
+		/* Refill our page pool before entering atomic section */
+		pool_refill(&compress->pool, ALLOW_FAIL);
+
+		ee = capture_engine(engine, compress, dump_flags);
+		if (!ee)
+			continue;
+
+		ee->hung = engine->mask & engine_mask;
+
+		gt->simulated |= ee->simulated;
+		if (ee->simulated) {
+			if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
+				intel_guc_capture_free_node(ee);
+			kfree(ee);
+			continue;
+		}
+
+		ee->next = gt->engine;
+		gt->engine = ee;
+	}
+}
+
+static void gt_record_guc_ctb(struct intel_ctb_coredump *saved,
+			      const struct intel_guc_ct_buffer *ctb,
+			      const void *blob_ptr, struct intel_guc *guc)
+{
+	if (!ctb || !ctb->desc)
+		return;
+
+	saved->raw_status = ctb->desc->status;
+	saved->raw_head = ctb->desc->head;
+	saved->raw_tail = ctb->desc->tail;
+	saved->head = ctb->head;
+	saved->tail = ctb->tail;
+	saved->size = ctb->size;
+	saved->desc_offset = ((void *)ctb->desc) - blob_ptr;
+	saved->cmds_offset = ((void *)ctb->cmds) - blob_ptr;
+}
+
+static struct intel_uc_coredump *
+gt_record_uc(struct intel_gt_coredump *gt,
+	     struct i915_vma_compress *compress)
+{
+	const struct intel_uc *uc = &gt->_gt->uc;
+	struct intel_uc_coredump *error_uc;
+
+	error_uc = kzalloc(sizeof(*error_uc), ALLOW_FAIL);
+	if (!error_uc)
+		return NULL;
+
+	memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
+	memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
+
+	error_uc->guc_fw.file_selected.path = kstrdup(uc->guc.fw.file_selected.path, ALLOW_FAIL);
+	error_uc->huc_fw.file_selected.path = kstrdup(uc->huc.fw.file_selected.path, ALLOW_FAIL);
+	error_uc->guc_fw.file_wanted.path = kstrdup(uc->guc.fw.file_wanted.path, ALLOW_FAIL);
+	error_uc->huc_fw.file_wanted.path = kstrdup(uc->huc.fw.file_wanted.path, ALLOW_FAIL);
+
+	/*
+	 * Save the GuC log and include a timestamp reference for converting the
+	 * log times to system times (in conjunction with the error->boottime and
+	 * gt->clock_frequency fields saved elsewhere).
+	 */
+	error_uc->guc.timestamp = intel_uncore_read(gt->_gt->uncore, GUCPMTIMESTAMP);
+	error_uc->guc.vma_log = create_vma_coredump(gt->_gt, uc->guc.log.vma,
+						    "GuC log buffer", compress);
+	error_uc->guc.vma_ctb = create_vma_coredump(gt->_gt, uc->guc.ct.vma,
+						    "GuC CT buffer", compress);
+	error_uc->guc.last_fence = uc->guc.ct.requests.last_fence;
+	gt_record_guc_ctb(error_uc->guc.ctb + 0, &uc->guc.ct.ctbs.send,
+			  uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
+	gt_record_guc_ctb(error_uc->guc.ctb + 1, &uc->guc.ct.ctbs.recv,
+			  uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
+
+	return error_uc;
+}
+
+/* Capture display registers. */
+static void gt_record_display_regs(struct intel_gt_coredump *gt)
+{
+	struct intel_uncore *uncore = gt->_gt->uncore;
+	struct drm_i915_private *i915 = uncore->i915;
+
+	if (GRAPHICS_VER(i915) >= 6)
+		gt->derrmr = intel_uncore_read(uncore, DERRMR);
+
+	if (GRAPHICS_VER(i915) >= 8)
+		gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
+	else if (IS_VALLEYVIEW(i915))
+		gt->ier = intel_uncore_read(uncore, VLV_IER);
+	else if (HAS_PCH_SPLIT(i915))
+		gt->ier = intel_uncore_read(uncore, DEIER);
+	else if (GRAPHICS_VER(i915) == 2)
+		gt->ier = intel_uncore_read16(uncore, GEN2_IER);
+	else
+		gt->ier = intel_uncore_read(uncore, GEN2_IER);
+}
+
+/* Capture all other registers that GuC doesn't capture. */
+static void gt_record_global_nonguc_regs(struct intel_gt_coredump *gt)
+{
+	struct intel_uncore *uncore = gt->_gt->uncore;
+	struct drm_i915_private *i915 = uncore->i915;
+	int i;
+
+	if (IS_VALLEYVIEW(i915)) {
+		gt->gtier[0] = intel_uncore_read(uncore, GTIER);
+		gt->ngtier = 1;
+	} else if (GRAPHICS_VER(i915) >= 11) {
+		gt->gtier[0] =
+			intel_uncore_read(uncore,
+					  GEN11_RENDER_COPY_INTR_ENABLE);
+		gt->gtier[1] =
+			intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
+		gt->gtier[2] =
+			intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
+		gt->gtier[3] =
+			intel_uncore_read(uncore,
+					  GEN11_GPM_WGBOXPERF_INTR_ENABLE);
+		gt->gtier[4] =
+			intel_uncore_read(uncore,
+					  GEN11_CRYPTO_RSVD_INTR_ENABLE);
+		gt->gtier[5] =
+			intel_uncore_read(uncore,
+					  GEN11_GUNIT_CSME_INTR_ENABLE);
+		gt->ngtier = 6;
+	} else if (GRAPHICS_VER(i915) >= 8) {
+		for (i = 0; i < 4; i++)
+			gt->gtier[i] =
+				intel_uncore_read(uncore, GEN8_GT_IER(i));
+		gt->ngtier = 4;
+	} else if (HAS_PCH_SPLIT(i915)) {
+		gt->gtier[0] = intel_uncore_read(uncore, GTIER);
+		gt->ngtier = 1;
+	}
+
+	gt->eir = intel_uncore_read(uncore, EIR);
+	gt->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
+}
+
+/*
+ * Capture all registers that relate to workload submission.
+ * NOTE: In GuC submission, when GuC resets an engine, it can dump these for us
+ */
+static void gt_record_global_regs(struct intel_gt_coredump *gt)
+{
+	struct intel_uncore *uncore = gt->_gt->uncore;
+	struct drm_i915_private *i915 = uncore->i915;
+	int i;
+
+	/*
+	 * General organization
+	 * 1. Registers specific to a single generation
+	 * 2. Registers which belong to multiple generations
+	 * 3. Feature specific registers.
+	 * 4. Everything else
+	 * Please try to follow the order.
+	 */
+
+	/* 1: Registers specific to a single generation */
+	if (IS_VALLEYVIEW(i915))
+		gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
+
+	if (GRAPHICS_VER(i915) == 7)
+		gt->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
+
+	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
+		gt->fault_data0 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
+							XEHP_FAULT_TLB_DATA0);
+		gt->fault_data1 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
+							XEHP_FAULT_TLB_DATA1);
+	} else if (GRAPHICS_VER(i915) >= 12) {
+		gt->fault_data0 = intel_uncore_read(uncore,
+						    GEN12_FAULT_TLB_DATA0);
+		gt->fault_data1 = intel_uncore_read(uncore,
+						    GEN12_FAULT_TLB_DATA1);
+	} else if (GRAPHICS_VER(i915) >= 8) {
+		gt->fault_data0 = intel_uncore_read(uncore,
+						    GEN8_FAULT_TLB_DATA0);
+		gt->fault_data1 = intel_uncore_read(uncore,
+						    GEN8_FAULT_TLB_DATA1);
+	}
+
+	if (GRAPHICS_VER(i915) == 6) {
+		gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
+		gt->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
+		gt->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
+	}
+
+	/* 2: Registers which belong to multiple generations */
+	if (GRAPHICS_VER(i915) >= 7)
+		gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
+
+	if (GRAPHICS_VER(i915) >= 6) {
+		if (GRAPHICS_VER(i915) < 12) {
+			gt->error = intel_uncore_read(uncore, ERROR_GEN6);
+			gt->done_reg = intel_uncore_read(uncore, DONE_REG);
+		}
+	}
+
+	/* 3: Feature specific registers */
+	if (IS_GRAPHICS_VER(i915, 6, 7)) {
+		gt->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
+		gt->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
+	}
+
+	if (IS_GRAPHICS_VER(i915, 8, 11))
+		gt->gtt_cache = intel_uncore_read(uncore, HSW_GTT_CACHE_EN);
+
+	if (GRAPHICS_VER(i915) == 12)
+		gt->aux_err = intel_uncore_read(uncore, GEN12_AUX_ERR_DBG);
+
+	if (GRAPHICS_VER(i915) >= 12) {
+		for (i = 0; i < I915_MAX_SFC; i++) {
+			/*
+			 * SFC_DONE resides in the VD forcewake domain, so it
+			 * only exists if the corresponding VCS engine is
+			 * present.
+			 */
+			if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
+			    !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
+				continue;
+
+			gt->sfc_done[i] =
+				intel_uncore_read(uncore, GEN12_SFC_DONE(i));
+		}
+
+		gt->gam_done = intel_uncore_read(uncore, GEN12_GAM_DONE);
+	}
+}
+
+static void gt_record_info(struct intel_gt_coredump *gt)
+{
+	memcpy(&gt->info, &gt->_gt->info, sizeof(struct intel_gt_info));
+	gt->clock_frequency = gt->_gt->clock_frequency;
+	gt->clock_period_ns = gt->_gt->clock_period_ns;
+}
+
+/*
+ * Generate a semi-unique error code. The code is not meant to have meaning, The
+ * code's only purpose is to try to prevent false duplicated bug reports by
+ * grossly estimating a GPU error state.
+ *
+ * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
+ * the hang if we could strip the GTT offset information from it.
+ *
+ * It's only a small step better than a random number in its current form.
+ */
+static u32 generate_ecode(const struct intel_engine_coredump *ee)
+{
+	/*
+	 * IPEHR would be an ideal way to detect errors, as it's the gross
+	 * measure of "the command that hung." However, has some very common
+	 * synchronization commands which almost always appear in the case
+	 * strictly a client bug. Use instdone to differentiate those some.
+	 */
+	return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
+}
+
+static const char *error_msg(struct i915_gpu_coredump *error)
+{
+	struct intel_engine_coredump *first = NULL;
+	unsigned int hung_classes = 0;
+	struct intel_gt_coredump *gt;
+	int len;
+
+	for (gt = error->gt; gt; gt = gt->next) {
+		struct intel_engine_coredump *cs;
+
+		for (cs = gt->engine; cs; cs = cs->next) {
+			if (cs->hung) {
+				hung_classes |= BIT(cs->engine->uabi_class);
+				if (!first)
+					first = cs;
+			}
+		}
+	}
+
+	len = scnprintf(error->error_msg, sizeof(error->error_msg),
+			"GPU HANG: ecode %d:%x:%08x",
+			GRAPHICS_VER(error->i915), hung_classes,
+			generate_ecode(first));
+	if (first && first->context.pid) {
+		/* Just show the first executing process, more is confusing */
+		len += scnprintf(error->error_msg + len,
+				 sizeof(error->error_msg) - len,
+				 ", in %s [%d]",
+				 first->context.comm, first->context.pid);
+	}
+
+	return error->error_msg;
+}
+
+static void capture_gen(struct i915_gpu_coredump *error)
+{
+	struct drm_i915_private *i915 = error->i915;
+
+	error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
+	error->suspended = i915->runtime_pm.suspended;
+
+	error->iommu = i915_vtd_active(i915);
+	error->reset_count = i915_reset_count(&i915->gpu_error);
+	error->suspend_count = i915->suspend_count;
+
+	i915_params_copy(&error->params, &i915->params);
+	memcpy(&error->device_info,
+	       INTEL_INFO(i915),
+	       sizeof(error->device_info));
+	memcpy(&error->runtime_info,
+	       RUNTIME_INFO(i915),
+	       sizeof(error->runtime_info));
+	memcpy(&error->display_device_info, DISPLAY_INFO(i915),
+	       sizeof(error->display_device_info));
+	memcpy(&error->display_runtime_info, DISPLAY_RUNTIME_INFO(i915),
+	       sizeof(error->display_runtime_info));
+	error->driver_caps = i915->caps;
+}
+
+struct i915_gpu_coredump *
+i915_gpu_coredump_alloc(struct drm_i915_private *i915, gfp_t gfp)
+{
+	struct i915_gpu_coredump *error;
+
+	if (!i915->params.error_capture)
+		return NULL;
+
+	error = kzalloc(sizeof(*error), gfp);
+	if (!error)
+		return NULL;
+
+	kref_init(&error->ref);
+	error->i915 = i915;
+
+	error->time = ktime_get_real();
+	error->boottime = ktime_get_boottime();
+	error->uptime = ktime_sub(ktime_get(), to_gt(i915)->last_init_time);
+	error->capture = jiffies;
+
+	capture_gen(error);
+
+	return error;
+}
+
+#define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
+
+struct intel_gt_coredump *
+intel_gt_coredump_alloc(struct intel_gt *gt, gfp_t gfp, u32 dump_flags)
+{
+	struct intel_gt_coredump *gc;
+
+	gc = kzalloc(sizeof(*gc), gfp);
+	if (!gc)
+		return NULL;
+
+	gc->_gt = gt;
+	gc->awake = intel_gt_pm_is_awake(gt);
+
+	gt_record_display_regs(gc);
+	gt_record_global_nonguc_regs(gc);
+
+	/*
+	 * GuC dumps global, eng-class and eng-instance registers
+	 * (that can change as part of engine state during execution)
+	 * before an engine is reset due to a hung context.
+	 * GuC captures and reports all three groups of registers
+	 * together as a single set before the engine is reset.
+	 * Thus, if GuC triggered the context reset we retrieve
+	 * the register values as part of gt_record_engines.
+	 */
+	if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE))
+		gt_record_global_regs(gc);
+
+	gt_record_fences(gc);
+
+	return gc;
+}
+
+struct i915_vma_compress *
+i915_vma_capture_prepare(struct intel_gt_coredump *gt)
+{
+	struct i915_vma_compress *compress;
+
+	compress = kmalloc(sizeof(*compress), ALLOW_FAIL);
+	if (!compress)
+		return NULL;
+
+	if (!compress_init(compress)) {
+		kfree(compress);
+		return NULL;
+	}
+
+	return compress;
+}
+
+void i915_vma_capture_finish(struct intel_gt_coredump *gt,
+			     struct i915_vma_compress *compress)
+{
+	if (!compress)
+		return;
+
+	compress_fini(compress);
+	kfree(compress);
+}
+
+static struct i915_gpu_coredump *
+__i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
+{
+	struct drm_i915_private *i915 = gt->i915;
+	struct i915_gpu_coredump *error;
+
+	/* Check if GPU capture has been disabled */
+	error = READ_ONCE(i915->gpu_error.first_error);
+	if (IS_ERR(error))
+		return error;
+
+	error = i915_gpu_coredump_alloc(i915, ALLOW_FAIL);
+	if (!error)
+		return ERR_PTR(-ENOMEM);
+
+	error->gt = intel_gt_coredump_alloc(gt, ALLOW_FAIL, dump_flags);
+	if (error->gt) {
+		struct i915_vma_compress *compress;
+
+		compress = i915_vma_capture_prepare(error->gt);
+		if (!compress) {
+			kfree(error->gt);
+			kfree(error);
+			return ERR_PTR(-ENOMEM);
+		}
+
+		if (INTEL_INFO(i915)->has_gt_uc) {
+			error->gt->uc = gt_record_uc(error->gt, compress);
+			if (error->gt->uc) {
+				if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
+					error->gt->uc->guc.is_guc_capture = true;
+				else
+					GEM_BUG_ON(error->gt->uc->guc.is_guc_capture);
+			}
+		}
+
+		gt_record_info(error->gt);
+		gt_record_engines(error->gt, engine_mask, compress, dump_flags);
+
+
+		i915_vma_capture_finish(error->gt, compress);
+
+		error->simulated |= error->gt->simulated;
+	}
+
+	error->overlay = intel_overlay_capture_error_state(i915);
+
+	return error;
+}
+
+struct i915_gpu_coredump *
+i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
+{
+	static DEFINE_MUTEX(capture_mutex);
+	int ret = mutex_lock_interruptible(&capture_mutex);
+	struct i915_gpu_coredump *dump;
+
+	if (ret)
+		return ERR_PTR(ret);
+
+	dump = __i915_gpu_coredump(gt, engine_mask, dump_flags);
+	mutex_unlock(&capture_mutex);
+
+	return dump;
+}
+
+void i915_error_state_store(struct i915_gpu_coredump *error)
+{
+	struct drm_i915_private *i915;
+	static bool warned;
+
+	if (IS_ERR_OR_NULL(error))
+		return;
+
+	i915 = error->i915;
+	drm_info(&i915->drm, "%s\n", error_msg(error));
+
+	if (error->simulated ||
+	    cmpxchg(&i915->gpu_error.first_error, NULL, error))
+		return;
+
+	i915_gpu_coredump_get(error);
+
+	if (!xchg(&warned, true) &&
+	    ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
+		pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
+		pr_info("Please file a _new_ bug report at https://gitlab.freedesktop.org/drm/intel/issues/new.\n");
+		pr_info("Please see https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs for details.\n");
+		pr_info("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
+		pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
+		pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
+			i915->drm.primary->index);
+	}
+}
+
+/**
+ * i915_capture_error_state - capture an error record for later analysis
+ * @gt: intel_gt which originated the hang
+ * @engine_mask: hung engines
+ * @dump_flags: dump flags
+ *
+ * Should be called when an error is detected (either a hang or an error
+ * interrupt) to capture error state from the time of the error.  Fills
+ * out a structure which becomes available in debugfs for user level tools
+ * to pick up.
+ */
+void i915_capture_error_state(struct intel_gt *gt,
+			      intel_engine_mask_t engine_mask, u32 dump_flags)
+{
+	struct i915_gpu_coredump *error;
+
+	error = i915_gpu_coredump(gt, engine_mask, dump_flags);
+	if (IS_ERR(error)) {
+		cmpxchg(&gt->i915->gpu_error.first_error, NULL, error);
+		return;
+	}
+
+	i915_error_state_store(error);
+	i915_gpu_coredump_put(error);
+}
+
+struct i915_gpu_coredump *
+i915_first_error_state(struct drm_i915_private *i915)
+{
+	struct i915_gpu_coredump *error;
+
+	spin_lock_irq(&i915->gpu_error.lock);
+	error = i915->gpu_error.first_error;
+	if (!IS_ERR_OR_NULL(error))
+		i915_gpu_coredump_get(error);
+	spin_unlock_irq(&i915->gpu_error.lock);
+
+	return error;
+}
+
+void i915_reset_error_state(struct drm_i915_private *i915)
+{
+	struct i915_gpu_coredump *error;
+
+	spin_lock_irq(&i915->gpu_error.lock);
+	error = i915->gpu_error.first_error;
+	if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
+		i915->gpu_error.first_error = NULL;
+	spin_unlock_irq(&i915->gpu_error.lock);
+
+	if (!IS_ERR_OR_NULL(error))
+		i915_gpu_coredump_put(error);
+}
+
+void i915_disable_error_state(struct drm_i915_private *i915, int err)
+{
+	spin_lock_irq(&i915->gpu_error.lock);
+	if (!i915->gpu_error.first_error)
+		i915->gpu_error.first_error = ERR_PTR(err);
+	spin_unlock_irq(&i915->gpu_error.lock);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
+void intel_klog_error_capture(struct intel_gt *gt,
+			      intel_engine_mask_t engine_mask)
+{
+	static int g_count;
+	struct drm_i915_private *i915 = gt->i915;
+	struct i915_gpu_coredump *error;
+	intel_wakeref_t wakeref;
+	size_t buf_size = PAGE_SIZE * 128;
+	size_t pos_err;
+	char *buf, *ptr, *next;
+	int l_count = g_count++;
+	int line = 0;
+
+	/* Can't allocate memory during a reset */
+	if (test_bit(I915_RESET_BACKOFF, &gt->reset.flags)) {
+		drm_err(&gt->i915->drm, "[Capture/%d.%d] Inside GT reset, skipping error capture :(\n",
+			l_count, line++);
+		return;
+	}
+
+	error = READ_ONCE(i915->gpu_error.first_error);
+	if (error) {
+		drm_err(&i915->drm, "[Capture/%d.%d] Clearing existing error capture first...\n",
+			l_count, line++);
+		i915_reset_error_state(i915);
+	}
+
+	with_intel_runtime_pm(&i915->runtime_pm, wakeref)
+		error = i915_gpu_coredump(gt, engine_mask, CORE_DUMP_FLAG_NONE);
+
+	if (IS_ERR(error)) {
+		drm_err(&i915->drm, "[Capture/%d.%d] Failed to capture error capture: %ld!\n",
+			l_count, line++, PTR_ERR(error));
+		return;
+	}
+
+	buf = kvmalloc(buf_size, GFP_KERNEL);
+	if (!buf) {
+		drm_err(&i915->drm, "[Capture/%d.%d] Failed to allocate buffer for error capture!\n",
+			l_count, line++);
+		i915_gpu_coredump_put(error);
+		return;
+	}
+
+	drm_info(&i915->drm, "[Capture/%d.%d] Dumping i915 error capture for %ps...\n",
+		 l_count, line++, __builtin_return_address(0));
+
+	/* Largest string length safe to print via dmesg */
+#	define MAX_CHUNK	800
+
+	pos_err = 0;
+	while (1) {
+		ssize_t got = i915_gpu_coredump_copy_to_buffer(error, buf, pos_err, buf_size - 1);
+
+		if (got <= 0)
+			break;
+
+		buf[got] = 0;
+		pos_err += got;
+
+		ptr = buf;
+		while (got > 0) {
+			size_t count;
+			char tag[2];
+
+			next = strnchr(ptr, got, '\n');
+			if (next) {
+				count = next - ptr;
+				*next = 0;
+				tag[0] = '>';
+				tag[1] = '<';
+			} else {
+				count = got;
+				tag[0] = '}';
+				tag[1] = '{';
+			}
+
+			if (count > MAX_CHUNK) {
+				size_t pos;
+				char *ptr2 = ptr;
+
+				for (pos = MAX_CHUNK; pos < count; pos += MAX_CHUNK) {
+					char chr = ptr[pos];
+
+					ptr[pos] = 0;
+					drm_info(&i915->drm, "[Capture/%d.%d] }%s{\n",
+						 l_count, line++, ptr2);
+					ptr[pos] = chr;
+					ptr2 = ptr + pos;
+
+					/*
+					 * If spewing large amounts of data via a serial console,
+					 * this can be a very slow process. So be friendly and try
+					 * not to cause 'softlockup on CPU' problems.
+					 */
+					cond_resched();
+				}
+
+				if (ptr2 < (ptr + count))
+					drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
+						 l_count, line++, tag[0], ptr2, tag[1]);
+				else if (tag[0] == '>')
+					drm_info(&i915->drm, "[Capture/%d.%d] ><\n",
+						 l_count, line++);
+			} else {
+				drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
+					 l_count, line++, tag[0], ptr, tag[1]);
+			}
+
+			ptr = next;
+			got -= count;
+			if (next) {
+				ptr++;
+				got--;
+			}
+
+			/* As above. */
+			cond_resched();
+		}
+
+		if (got)
+			drm_info(&i915->drm, "[Capture/%d.%d] Got %zd bytes remaining!\n",
+				 l_count, line++, got);
+	}
+
+	kvfree(buf);
+
+	drm_info(&i915->drm, "[Capture/%d.%d] Dumped %zd bytes\n", l_count, line++, pos_err);
+}
+#endif