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OpenCloudOS-Kernel/drivers/gpu/drm/i915/i915_gpu_error.c

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/*
* 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/nmi.h>
#include <linux/pagevec.h>
#include <linux/scatterlist.h>
#include <linux/utsname.h>
#include <linux/zlib.h>
#include <drm/drm_print.h>
#include "display/intel_atomic.h"
#include "display/intel_overlay.h"
#include "gem/i915_gem_context.h"
#include "i915_drv.h"
#include "i915_gpu_error.h"
#include "i915_memcpy.h"
#include "i915_scatterlist.h"
#include "intel_csr.h"
#define ALLOW_FAIL (GFP_KERNEL | __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 pagevec *pv)
{
pagevec_release(pv);
}
static int pool_refill(struct pagevec *pv, gfp_t gfp)
{
while (pagevec_space(pv)) {
struct page *p;
p = alloc_page(gfp);
if (!p)
return -ENOMEM;
pagevec_add(pv, p);
}
return 0;
}
static int pool_init(struct pagevec *pv, gfp_t gfp)
{
int err;
pagevec_init(pv);
err = pool_refill(pv, gfp);
if (err)
pool_fini(pv);
return err;
}
static void *pool_alloc(struct pagevec *pv, gfp_t gfp)
{
struct page *p;
p = alloc_page(gfp);
if (!p && pagevec_count(pv))
p = pv->pages[--pv->nr];
return p ? page_address(p) : NULL;
}
static void pool_free(struct pagevec *pv, void *addr)
{
struct page *p = virt_to_page(addr);
if (pagevec_space(pv))
pagevec_add(pv, p);
else
__free_page(p);
}
#ifdef CONFIG_DRM_I915_COMPRESS_ERROR
struct compress {
struct pagevec pool;
struct z_stream_s zstream;
void *tmp;
};
static bool compress_init(struct 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 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 compress *c,
struct drm_i915_error_object *dst)
{
void *page;
if (dst->page_count >= dst->num_pages)
return ERR_PTR(-ENOSPC);
page = pool_alloc(&c->pool, ALLOW_FAIL);
if (!page)
return ERR_PTR(-ENOMEM);
return dst->pages[dst->page_count++] = page;
}
static int compress_page(struct compress *c,
void *src,
struct drm_i915_error_object *dst)
{
struct z_stream_s *zstream = &c->zstream;
zstream->next_in = src;
if (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;
} 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 compress *c,
struct drm_i915_error_object *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 compress *c)
{
zlib_deflateEnd(&c->zstream);
}
static void compress_fini(struct 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 compress {
struct pagevec pool;
};
static bool compress_init(struct compress *c)
{
return pool_init(&c->pool, ALLOW_FAIL) == 0;
}
static bool compress_start(struct compress *c)
{
return true;
}
static int compress_page(struct compress *c,
void *src,
struct drm_i915_error_object *dst)
{
void *ptr;
ptr = pool_alloc(&c->pool, ALLOW_FAIL);
if (!ptr)
return -ENOMEM;
if (!i915_memcpy_from_wc(ptr, src, PAGE_SIZE))
memcpy(ptr, src, PAGE_SIZE);
dst->pages[dst->page_count++] = ptr;
return 0;
}
static int compress_flush(struct compress *c,
struct drm_i915_error_object *dst)
{
return 0;
}
static void compress_finish(struct compress *c)
{
}
static void compress_fini(struct 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 drm_i915_error_engine *ee)
{
int slice;
int subslice;
err_printf(m, " INSTDONE: 0x%08x\n",
ee->instdone.instdone);
if (ee->engine->class != RENDER_CLASS || INTEL_GEN(m->i915) <= 3)
return;
err_printf(m, " SC_INSTDONE: 0x%08x\n",
ee->instdone.slice_common);
if (INTEL_GEN(m->i915) <= 6)
return;
for_each_instdone_slice_subslice(m->i915, slice, subslice)
err_printf(m, " SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
slice, subslice,
ee->instdone.sampler[slice][subslice]);
for_each_instdone_slice_subslice(m->i915, slice, subslice)
err_printf(m, " ROW_INSTDONE[%d][%d]: 0x%08x\n",
slice, subslice,
ee->instdone.row[slice][subslice]);
}
static void error_print_request(struct drm_i915_error_state_buf *m,
const char *prefix,
const struct drm_i915_error_request *erq,
const unsigned long epoch)
{
if (!erq->seqno)
return;
err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, emitted %dms, start %08x, 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,
jiffies_to_msecs(erq->jiffies - epoch),
erq->start, erq->head, erq->tail);
}
static void error_print_context(struct drm_i915_error_state_buf *m,
const char *header,
const struct drm_i915_error_context *ctx)
{
err_printf(m, "%s%s[%d] hw_id %d, prio %d, guilty %d active %d\n",
header, ctx->comm, ctx->pid, ctx->hw_id,
ctx->sched_attr.priority, ctx->guilty, ctx->active);
}
static void error_print_engine(struct drm_i915_error_state_buf *m,
const struct drm_i915_error_engine *ee,
const unsigned long epoch)
{
int n;
err_printf(m, "%s command stream:\n", ee->engine->name);
err_printf(m, " IDLE?: %s\n", yesno(ee->idle));
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);
error_print_instdone(m, ee);
if (ee->batchbuffer) {
u64 start = ee->batchbuffer->gtt_offset;
u64 end = start + ee->batchbuffer->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 (INTEL_GEN(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 (INTEL_GEN(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 (HAS_PPGTT(m->i915)) {
err_printf(m, " GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
if (INTEL_GEN(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);
}
}
err_printf(m, " ring->head: 0x%08x\n", ee->cpu_ring_head);
err_printf(m, " ring->tail: 0x%08x\n", ee->cpu_ring_tail);
err_printf(m, " hangcheck timestamp: %dms (%lu%s)\n",
jiffies_to_msecs(ee->hangcheck_timestamp - epoch),
ee->hangcheck_timestamp,
ee->hangcheck_timestamp == epoch ? "; epoch" : "");
err_printf(m, " engine reset count: %u\n", ee->reset_count);
for (n = 0; n < ee->num_ports; n++) {
err_printf(m, " ELSP[%d]:", n);
error_print_request(m, " ", &ee->execlist[n], epoch);
}
error_print_context(m, " Active context: ", &ee->context);
}
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);
}
static void print_error_obj(struct drm_i915_error_state_buf *m,
const struct intel_engine_cs *engine,
const char *name,
const struct drm_i915_error_object *obj)
{
char out[ASCII85_BUFSZ];
int page;
if (!obj)
return;
if (name) {
err_printf(m, "%s --- %s = 0x%08x %08x\n",
engine ? engine->name : "global", name,
upper_32_bits(obj->gtt_offset),
lower_32_bits(obj->gtt_offset));
}
err_compression_marker(m);
for (page = 0; page < obj->page_count; page++) {
int i, len;
len = PAGE_SIZE;
if (page == obj->page_count - 1)
len -= obj->unused;
len = ascii85_encode_len(len);
for (i = 0; i < len; i++)
err_puts(m, ascii85_encode(obj->pages[page][i], out));
}
err_puts(m, "\n");
}
static void err_print_capabilities(struct drm_i915_error_state_buf *m,
const struct intel_device_info *info,
const struct intel_runtime_info *runtime,
const struct intel_driver_caps *caps)
{
struct drm_printer p = i915_error_printer(m);
intel_device_info_dump_flags(info, &p);
intel_driver_caps_print(caps, &p);
intel_device_info_dump_topology(&runtime->sseu, &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 = i915->drm.pdev;
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_uc(struct drm_i915_error_state_buf *m,
const struct i915_error_uc *error_uc)
{
struct drm_printer p = i915_error_printer(m);
const struct i915_gpu_state *error =
container_of(error_uc, typeof(*error), uc);
if (!error->device_info.has_gt_uc)
return;
intel_uc_fw_dump(&error_uc->guc_fw, &p);
intel_uc_fw_dump(&error_uc->huc_fw, &p);
print_error_obj(m, NULL, "GuC log buffer", error_uc->guc_log);
}
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_to_sgl(struct drm_i915_error_state_buf *m,
struct i915_gpu_state *error)
{
const struct drm_i915_error_engine *ee;
struct timespec64 ts;
int i, j;
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, "Epoch: %lu jiffies (%u HZ)\n", error->epoch, HZ);
err_printf(m, "Capture: %lu jiffies; %d ms ago, %d ms after epoch\n",
error->capture,
jiffies_to_msecs(jiffies - error->capture),
jiffies_to_msecs(error->capture - error->epoch));
for (ee = error->engine; 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);
if (HAS_CSR(m->i915)) {
struct intel_csr *csr = &m->i915->csr;
err_printf(m, "DMC loaded: %s\n",
yesno(csr->dmc_payload != NULL));
err_printf(m, "DMC fw version: %d.%d\n",
CSR_VERSION_MAJOR(csr->version),
CSR_VERSION_MINOR(csr->version));
}
err_printf(m, "GT awake: %s\n", yesno(error->awake));
err_printf(m, "RPM wakelock: %s\n", yesno(error->wakelock));
err_printf(m, "PM suspended: %s\n", yesno(error->suspended));
err_printf(m, "EIR: 0x%08x\n", error->eir);
err_printf(m, "IER: 0x%08x\n", error->ier);
for (i = 0; i < error->ngtier; i++)
err_printf(m, "GTIER[%d]: 0x%08x\n", i, error->gtier[i]);
err_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
err_printf(m, "FORCEWAKE: 0x%08x\n", error->forcewake);
err_printf(m, "DERRMR: 0x%08x\n", error->derrmr);
err_printf(m, "CCID: 0x%08x\n", error->ccid);
for (i = 0; i < error->nfence; i++)
err_printf(m, " fence[%d] = %08llx\n", i, error->fence[i]);
if (IS_GEN_RANGE(m->i915, 6, 11)) {
err_printf(m, "ERROR: 0x%08x\n", error->error);
err_printf(m, "DONE_REG: 0x%08x\n", error->done_reg);
}
if (INTEL_GEN(m->i915) >= 8)
err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
error->fault_data1, error->fault_data0);
if (IS_GEN(m->i915, 7))
err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
for (ee = error->engine; ee; ee = ee->next)
error_print_engine(m, ee, error->epoch);
for (ee = error->engine; ee; ee = ee->next) {
const struct drm_i915_error_object *obj;
obj = ee->batchbuffer;
if (obj) {
err_puts(m, ee->engine->name);
if (ee->context.pid)
err_printf(m, " (submitted by %s [%d])",
ee->context.comm,
ee->context.pid);
err_printf(m, " --- gtt_offset = 0x%08x %08x\n",
upper_32_bits(obj->gtt_offset),
lower_32_bits(obj->gtt_offset));
print_error_obj(m, ee->engine, NULL, obj);
}
for (j = 0; j < ee->user_bo_count; j++)
print_error_obj(m, ee->engine, "user", ee->user_bo[j]);
if (ee->num_requests) {
err_printf(m, "%s --- %d requests\n",
ee->engine->name,
ee->num_requests);
for (j = 0; j < ee->num_requests; j++)
error_print_request(m, " ",
&ee->requests[j],
error->epoch);
}
print_error_obj(m, ee->engine, "ringbuffer", ee->ringbuffer);
print_error_obj(m, ee->engine, "HW Status", ee->hws_page);
print_error_obj(m, ee->engine, "HW context", ee->ctx);
print_error_obj(m, ee->engine, "WA context", ee->wa_ctx);
print_error_obj(m, ee->engine,
"WA batchbuffer", ee->wa_batchbuffer);
print_error_obj(m, ee->engine,
"NULL context", ee->default_state);
}
if (error->overlay)
intel_overlay_print_error_state(m, error->overlay);
if (error->display)
intel_display_print_error_state(m, error->display);
err_print_capabilities(m, &error->device_info, &error->runtime_info,
&error->driver_caps);
err_print_params(m, &error->params);
err_print_uc(m, &error->uc);
}
static int err_print_to_sgl(struct i915_gpu_state *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_state_copy_to_buffer(struct i915_gpu_state *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_error_object_free(struct drm_i915_error_object *obj)
{
int page;
if (obj == NULL)
return;
for (page = 0; page < obj->page_count; page++)
free_page((unsigned long)obj->pages[page]);
kfree(obj);
}
static void cleanup_params(struct i915_gpu_state *error)
{
i915_params_free(&error->params);
}
static void cleanup_uc_state(struct i915_gpu_state *error)
{
struct i915_error_uc *error_uc = &error->uc;
kfree(error_uc->guc_fw.path);
kfree(error_uc->huc_fw.path);
i915_error_object_free(error_uc->guc_log);
}
void __i915_gpu_state_free(struct kref *error_ref)
{
struct i915_gpu_state *error =
container_of(error_ref, typeof(*error), ref);
long i;
while (error->engine) {
struct drm_i915_error_engine *ee = error->engine;
error->engine = ee->next;
for (i = 0; i < ee->user_bo_count; i++)
i915_error_object_free(ee->user_bo[i]);
kfree(ee->user_bo);
i915_error_object_free(ee->batchbuffer);
i915_error_object_free(ee->wa_batchbuffer);
i915_error_object_free(ee->ringbuffer);
i915_error_object_free(ee->hws_page);
i915_error_object_free(ee->ctx);
i915_error_object_free(ee->wa_ctx);
kfree(ee->requests);
kfree(ee);
}
kfree(error->overlay);
kfree(error->display);
cleanup_params(error);
cleanup_uc_state(error);
err_free_sgl(error->sgl);
kfree(error);
}
static struct drm_i915_error_object *
i915_error_object_create(struct drm_i915_private *i915,
struct i915_vma *vma,
struct compress *compress)
{
struct i915_ggtt *ggtt = &i915->ggtt;
const u64 slot = ggtt->error_capture.start;
struct drm_i915_error_object *dst;
unsigned long num_pages;
struct sgt_iter iter;
dma_addr_t dma;
int ret;
might_sleep();
if (!vma || !vma->pages)
return NULL;
num_pages = min_t(u64, vma->size, vma->obj->base.size) >> PAGE_SHIFT;
num_pages = DIV_ROUND_UP(10 * num_pages, 8); /* worstcase zlib growth */
dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *), ALLOW_FAIL);
if (!dst)
return NULL;
if (!compress_start(compress)) {
kfree(dst);
return NULL;
}
dst->gtt_offset = vma->node.start;
dst->gtt_size = vma->node.size;
dst->num_pages = num_pages;
dst->page_count = 0;
dst->unused = 0;
ret = -EINVAL;
for_each_sgt_dma(dma, iter, vma->pages) {
void __iomem *s;
ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0);
s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
ret = compress_page(compress, (void __force *)s, dst);
io_mapping_unmap(s);
if (ret)
break;
}
if (ret || compress_flush(compress, dst)) {
while (dst->page_count--)
pool_free(&compress->pool, dst->pages[dst->page_count]);
kfree(dst);
dst = NULL;
}
compress_finish(compress);
return dst;
}
/*
* 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 i915_error_generate_code(struct i915_gpu_state *error)
{
const struct drm_i915_error_engine *ee = error->engine;
/*
* 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 void gem_record_fences(struct i915_gpu_state *error)
{
struct drm_i915_private *dev_priv = error->i915;
struct intel_uncore *uncore = &dev_priv->uncore;
int i;
if (INTEL_GEN(dev_priv) >= 6) {
for (i = 0; i < dev_priv->ggtt.num_fences; i++)
error->fence[i] =
intel_uncore_read64(uncore,
FENCE_REG_GEN6_LO(i));
} else if (INTEL_GEN(dev_priv) >= 4) {
for (i = 0; i < dev_priv->ggtt.num_fences; i++)
error->fence[i] =
intel_uncore_read64(uncore,
FENCE_REG_965_LO(i));
} else {
for (i = 0; i < dev_priv->ggtt.num_fences; i++)
error->fence[i] =
intel_uncore_read(uncore, FENCE_REG(i));
}
error->nfence = i;
}
static void error_record_engine_registers(struct i915_gpu_state *error,
struct intel_engine_cs *engine,
struct drm_i915_error_engine *ee)
{
struct drm_i915_private *dev_priv = engine->i915;
if (INTEL_GEN(dev_priv) >= 6) {
ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
if (INTEL_GEN(dev_priv) >= 12)
ee->fault_reg = I915_READ(GEN12_RING_FAULT_REG);
else if (INTEL_GEN(dev_priv) >= 8)
ee->fault_reg = I915_READ(GEN8_RING_FAULT_REG);
else
ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
}
if (INTEL_GEN(dev_priv) >= 4) {
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);
if (INTEL_GEN(dev_priv) >= 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);
}
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 (INTEL_GEN(dev_priv) > 2)
ee->mode = ENGINE_READ(engine, RING_MI_MODE);
if (!HWS_NEEDS_PHYSICAL(dev_priv)) {
i915_reg_t mmio;
if (IS_GEN(dev_priv, 7)) {
switch (engine->id) {
default:
MISSING_CASE(engine->id);
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 (IS_GEN(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 = I915_READ(mmio);
}
ee->idle = intel_engine_is_idle(engine);
if (!ee->idle)
ee->hangcheck_timestamp = engine->hangcheck.action_timestamp;
ee->reset_count = i915_reset_engine_count(&dev_priv->gpu_error,
engine);
if (HAS_PPGTT(dev_priv)) {
int i;
ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
if (IS_GEN(dev_priv, 6)) {
ee->vm_info.pp_dir_base =
ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
} else if (IS_GEN(dev_priv, 7)) {
ee->vm_info.pp_dir_base =
ENGINE_READ(engine, RING_PP_DIR_BASE);
} else if (INTEL_GEN(dev_priv) >= 8) {
u32 base = engine->mmio_base;
for (i = 0; i < 4; i++) {
ee->vm_info.pdp[i] =
I915_READ(GEN8_RING_PDP_UDW(base, i));
ee->vm_info.pdp[i] <<= 32;
ee->vm_info.pdp[i] |=
I915_READ(GEN8_RING_PDP_LDW(base, i));
}
}
}
}
static void record_request(const struct i915_request *request,
struct drm_i915_error_request *erq)
{
const struct i915_gem_context *ctx = request->gem_context;
erq->flags = request->fence.flags;
erq->context = request->fence.context;
erq->seqno = request->fence.seqno;
erq->sched_attr = request->sched.attr;
erq->jiffies = request->emitted_jiffies;
erq->start = i915_ggtt_offset(request->ring->vma);
erq->head = request->head;
erq->tail = request->tail;
rcu_read_lock();
erq->pid = ctx->pid ? pid_nr(ctx->pid) : 0;
rcu_read_unlock();
}
static void engine_record_requests(struct intel_engine_cs *engine,
struct i915_request *first,
struct drm_i915_error_engine *ee)
{
struct i915_request *request;
int count;
count = 0;
request = first;
list_for_each_entry_from(request, &engine->active.requests, sched.link)
count++;
if (!count)
return;
ee->requests = kcalloc(count, sizeof(*ee->requests), ATOMIC_MAYFAIL);
if (!ee->requests)
return;
ee->num_requests = count;
count = 0;
request = first;
list_for_each_entry_from(request,
&engine->active.requests, sched.link) {
if (count >= ee->num_requests) {
/*
* If the ring request list was changed in
* between the point where the error request
* list was created and dimensioned and this
* point then just exit early to avoid crashes.
*
* We don't need to communicate that the
* request list changed state during error
* state capture and that the error state is
* slightly incorrect as a consequence since we
* are typically only interested in the request
* list state at the point of error state
* capture, not in any changes happening during
* the capture.
*/
break;
}
record_request(request, &ee->requests[count++]);
}
ee->num_requests = count;
}
static void error_record_engine_execlists(const struct intel_engine_cs *engine,
struct drm_i915_error_engine *ee)
{
const struct intel_engine_execlists * const execlists = &engine->execlists;
struct i915_request * const *port = execlists->active;
unsigned int n = 0;
while (*port)
record_request(*port++, &ee->execlist[n++]);
ee->num_ports = n;
}
static bool record_context(struct drm_i915_error_context *e,
const struct i915_request *rq)
{
const struct i915_gem_context *ctx = rq->gem_context;
if (ctx->pid) {
struct task_struct *task;
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->hw_id = ctx->hw_id;
e->sched_attr = ctx->sched;
e->guilty = atomic_read(&ctx->guilty_count);
e->active = atomic_read(&ctx->active_count);
return i915_gem_context_no_error_capture(ctx);
}
struct capture_vma {
struct capture_vma *next;
void **slot;
};
static struct capture_vma *
capture_vma(struct capture_vma *next,
struct i915_vma *vma,
struct drm_i915_error_object **out)
{
struct capture_vma *c;
*out = NULL;
if (!vma)
return next;
c = kmalloc(sizeof(*c), ATOMIC_MAYFAIL);
if (!c)
return next;
if (!i915_active_trygrab(&vma->active)) {
kfree(c);
return next;
}
c->slot = (void **)out;
*c->slot = i915_vma_get(vma);
c->next = next;
return c;
}
static struct capture_vma *
request_record_user_bo(struct i915_request *request,
struct drm_i915_error_engine *ee,
struct capture_vma *capture)
{
struct i915_capture_list *c;
struct drm_i915_error_object **bo;
long count, max;
max = 0;
for (c = request->capture_list; c; c = c->next)
max++;
if (!max)
return capture;
bo = kmalloc_array(max, sizeof(*bo), ATOMIC_MAYFAIL);
if (!bo) {
/* If we can't capture everything, try to capture something. */
max = min_t(long, max, PAGE_SIZE / sizeof(*bo));
bo = kmalloc_array(max, sizeof(*bo), ATOMIC_MAYFAIL);
}
if (!bo)
return capture;
count = 0;
for (c = request->capture_list; c; c = c->next) {
capture = capture_vma(capture, c->vma, &bo[count]);
if (++count == max)
break;
}
ee->user_bo = bo;
ee->user_bo_count = count;
return capture;
}
static struct drm_i915_error_object *
capture_object(struct drm_i915_private *dev_priv,
struct drm_i915_gem_object *obj,
struct compress *compress)
{
if (obj && i915_gem_object_has_pages(obj)) {
struct i915_vma fake = {
.node = { .start = U64_MAX, .size = obj->base.size },
.size = obj->base.size,
.pages = obj->mm.pages,
.obj = obj,
};
return i915_error_object_create(dev_priv, &fake, compress);
} else {
return NULL;
}
}
static void
gem_record_rings(struct i915_gpu_state *error, struct compress *compress)
{
struct drm_i915_private *i915 = error->i915;
struct intel_engine_cs *engine;
struct drm_i915_error_engine *ee;
ee = kzalloc(sizeof(*ee), GFP_KERNEL);
if (!ee)
return;
for_each_uabi_engine(engine, i915) {
struct capture_vma *capture = NULL;
struct i915_request *request;
unsigned long flags;
/* Refill our page pool before entering atomic section */
pool_refill(&compress->pool, ALLOW_FAIL);
spin_lock_irqsave(&engine->active.lock, flags);
request = intel_engine_find_active_request(engine);
if (!request) {
spin_unlock_irqrestore(&engine->active.lock, flags);
continue;
}
error->simulated |= record_context(&ee->context, request);
/*
* We need to copy these to an anonymous buffer
* as the simplest method to avoid being overwritten
* by userspace.
*/
capture = capture_vma(capture,
request->batch,
&ee->batchbuffer);
if (HAS_BROKEN_CS_TLB(i915))
capture = capture_vma(capture,
engine->gt->scratch,
&ee->wa_batchbuffer);
capture = request_record_user_bo(request, ee, capture);
capture = capture_vma(capture,
request->hw_context->state,
&ee->ctx);
capture = capture_vma(capture,
request->ring->vma,
&ee->ringbuffer);
ee->cpu_ring_head = request->ring->head;
ee->cpu_ring_tail = request->ring->tail;
ee->rq_head = request->head;
ee->rq_post = request->postfix;
ee->rq_tail = request->tail;
engine_record_requests(engine, request, ee);
spin_unlock_irqrestore(&engine->active.lock, flags);
error_record_engine_registers(error, engine, ee);
error_record_engine_execlists(engine, ee);
while (capture) {
struct capture_vma *this = capture;
struct i915_vma *vma = *this->slot;
*this->slot =
i915_error_object_create(i915, vma, compress);
i915_active_ungrab(&vma->active);
i915_vma_put(vma);
capture = this->next;
kfree(this);
}
ee->hws_page =
i915_error_object_create(i915,
engine->status_page.vma,
compress);
ee->wa_ctx =
i915_error_object_create(i915,
engine->wa_ctx.vma,
compress);
ee->default_state =
capture_object(i915, engine->default_state, compress);
ee->engine = engine;
ee->next = error->engine;
error->engine = ee;
ee = kzalloc(sizeof(*ee), GFP_KERNEL);
if (!ee)
return;
}
kfree(ee);
}
static void
capture_uc_state(struct i915_gpu_state *error, struct compress *compress)
{
struct drm_i915_private *i915 = error->i915;
struct i915_error_uc *error_uc = &error->uc;
struct intel_uc *uc = &i915->gt.uc;
/* Capturing uC state won't be useful if there is no GuC */
if (!error->device_info.has_gt_uc)
return;
memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
/* Non-default firmware paths will be specified by the modparam.
* As modparams are generally accesible from the userspace make
* explicit copies of the firmware paths.
*/
error_uc->guc_fw.path = kstrdup(uc->guc.fw.path, ALLOW_FAIL);
error_uc->huc_fw.path = kstrdup(uc->huc.fw.path, ALLOW_FAIL);
error_uc->guc_log = i915_error_object_create(i915,
uc->guc.log.vma,
compress);
}
/* Capture all registers which don't fit into another category. */
static void capture_reg_state(struct i915_gpu_state *error)
{
struct drm_i915_private *i915 = error->i915;
struct intel_uncore *uncore = &i915->uncore;
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)) {
error->gtier[0] = intel_uncore_read(uncore, GTIER);
error->ier = intel_uncore_read(uncore, VLV_IER);
error->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
}
if (IS_GEN(i915, 7))
error->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
if (INTEL_GEN(i915) >= 12) {
error->fault_data0 = intel_uncore_read(uncore,
GEN12_FAULT_TLB_DATA0);
error->fault_data1 = intel_uncore_read(uncore,
GEN12_FAULT_TLB_DATA1);
} else if (INTEL_GEN(i915) >= 8) {
error->fault_data0 = intel_uncore_read(uncore,
GEN8_FAULT_TLB_DATA0);
error->fault_data1 = intel_uncore_read(uncore,
GEN8_FAULT_TLB_DATA1);
}
if (IS_GEN(i915, 6)) {
error->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
error->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
error->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
}
/* 2: Registers which belong to multiple generations */
if (INTEL_GEN(i915) >= 7)
error->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
if (INTEL_GEN(i915) >= 6) {
error->derrmr = intel_uncore_read(uncore, DERRMR);
if (INTEL_GEN(i915) < 12) {
error->error = intel_uncore_read(uncore, ERROR_GEN6);
error->done_reg = intel_uncore_read(uncore, DONE_REG);
}
}
if (INTEL_GEN(i915) >= 5)
error->ccid = intel_uncore_read(uncore, CCID(RENDER_RING_BASE));
/* 3: Feature specific registers */
if (IS_GEN_RANGE(i915, 6, 7)) {
error->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
error->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
}
/* 4: Everything else */
if (INTEL_GEN(i915) >= 11) {
error->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
error->gtier[0] =
intel_uncore_read(uncore,
GEN11_RENDER_COPY_INTR_ENABLE);
error->gtier[1] =
intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
error->gtier[2] =
intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
error->gtier[3] =
intel_uncore_read(uncore,
GEN11_GPM_WGBOXPERF_INTR_ENABLE);
error->gtier[4] =
intel_uncore_read(uncore,
GEN11_CRYPTO_RSVD_INTR_ENABLE);
error->gtier[5] =
intel_uncore_read(uncore,
GEN11_GUNIT_CSME_INTR_ENABLE);
error->ngtier = 6;
} else if (INTEL_GEN(i915) >= 8) {
error->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
for (i = 0; i < 4; i++)
error->gtier[i] = intel_uncore_read(uncore,
GEN8_GT_IER(i));
error->ngtier = 4;
} else if (HAS_PCH_SPLIT(i915)) {
error->ier = intel_uncore_read(uncore, DEIER);
error->gtier[0] = intel_uncore_read(uncore, GTIER);
error->ngtier = 1;
} else if (IS_GEN(i915, 2)) {
error->ier = intel_uncore_read16(uncore, GEN2_IER);
} else if (!IS_VALLEYVIEW(i915)) {
error->ier = intel_uncore_read(uncore, GEN2_IER);
}
error->eir = intel_uncore_read(uncore, EIR);
error->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
}
static const char *
error_msg(struct i915_gpu_state *error,
intel_engine_mask_t engines, const char *msg)
{
int len;
len = scnprintf(error->error_msg, sizeof(error->error_msg),
"GPU HANG: ecode %d:%x:0x%08x",
INTEL_GEN(error->i915), engines,
i915_error_generate_code(error));
if (error->engine) {
/* Just show the first executing process, more is confusing */
len += scnprintf(error->error_msg + len,
sizeof(error->error_msg) - len,
", in %s [%d]",
error->engine->context.comm,
error->engine->context.pid);
}
if (msg)
len += scnprintf(error->error_msg + len,
sizeof(error->error_msg) - len,
", %s", msg);
return error->error_msg;
}
static void capture_gen_state(struct i915_gpu_state *error)
{
struct drm_i915_private *i915 = error->i915;
error->awake = i915->gt.awake;
error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
error->suspended = i915->runtime_pm.suspended;
error->iommu = -1;
#ifdef CONFIG_INTEL_IOMMU
error->iommu = intel_iommu_gfx_mapped;
#endif
error->reset_count = i915_reset_count(&i915->gpu_error);
error->suspend_count = i915->suspend_count;
memcpy(&error->device_info,
INTEL_INFO(i915),
sizeof(error->device_info));
memcpy(&error->runtime_info,
RUNTIME_INFO(i915),
sizeof(error->runtime_info));
error->driver_caps = i915->caps;
}
static void capture_params(struct i915_gpu_state *error)
{
i915_params_copy(&error->params, &i915_modparams);
}
static unsigned long capture_find_epoch(const struct i915_gpu_state *error)
{
const struct drm_i915_error_engine *ee;
unsigned long epoch = error->capture;
for (ee = error->engine; ee; ee = ee->next) {
if (ee->hangcheck_timestamp &&
time_before(ee->hangcheck_timestamp, epoch))
epoch = ee->hangcheck_timestamp;
}
return epoch;
}
static void capture_finish(struct i915_gpu_state *error)
{
struct i915_ggtt *ggtt = &error->i915->ggtt;
const u64 slot = ggtt->error_capture.start;
ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
}
#define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
struct i915_gpu_state *
i915_capture_gpu_state(struct drm_i915_private *i915)
{
struct i915_gpu_state *error;
struct compress compress;
/* Check if GPU capture has been disabled */
error = READ_ONCE(i915->gpu_error.first_error);
if (IS_ERR(error))
return error;
error = kzalloc(sizeof(*error), ALLOW_FAIL);
if (!error) {
i915_disable_error_state(i915, -ENOMEM);
return ERR_PTR(-ENOMEM);
}
if (!compress_init(&compress)) {
kfree(error);
i915_disable_error_state(i915, -ENOMEM);
return ERR_PTR(-ENOMEM);
}
kref_init(&error->ref);
error->i915 = i915;
error->time = ktime_get_real();
error->boottime = ktime_get_boottime();
error->uptime = ktime_sub(ktime_get(), i915->gt.last_init_time);
error->capture = jiffies;
capture_params(error);
capture_gen_state(error);
capture_uc_state(error, &compress);
capture_reg_state(error);
gem_record_fences(error);
gem_record_rings(error, &compress);
error->overlay = intel_overlay_capture_error_state(i915);
error->display = intel_display_capture_error_state(i915);
error->epoch = capture_find_epoch(error);
capture_finish(error);
compress_fini(&compress);
return error;
}
/**
* i915_capture_error_state - capture an error record for later analysis
* @i915: i915 device
* @engine_mask: the mask of engines triggering the hang
* @msg: a message to insert into the error capture header
*
* 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 drm_i915_private *i915,
intel_engine_mask_t engine_mask,
const char *msg)
{
static bool warned;
struct i915_gpu_state *error;
unsigned long flags;
if (!i915_modparams.error_capture)
return;
if (READ_ONCE(i915->gpu_error.first_error))
return;
error = i915_capture_gpu_state(i915);
if (IS_ERR(error))
return;
dev_info(i915->drm.dev, "%s\n", error_msg(error, engine_mask, msg));
if (!error->simulated) {
spin_lock_irqsave(&i915->gpu_error.lock, flags);
if (!i915->gpu_error.first_error) {
i915->gpu_error.first_error = error;
error = NULL;
}
spin_unlock_irqrestore(&i915->gpu_error.lock, flags);
}
if (error) {
__i915_gpu_state_free(&error->ref);
return;
}
if (!warned &&
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 on bugs.freedesktop.org against DRI -> DRM/Intel\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);
warned = true;
}
}
struct i915_gpu_state *
i915_first_error_state(struct drm_i915_private *i915)
{
struct i915_gpu_state *error;
spin_lock_irq(&i915->gpu_error.lock);
error = i915->gpu_error.first_error;
if (!IS_ERR_OR_NULL(error))
i915_gpu_state_get(error);
spin_unlock_irq(&i915->gpu_error.lock);
return error;
}
void i915_reset_error_state(struct drm_i915_private *i915)
{
struct i915_gpu_state *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_state_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);
}
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