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drm/i915: Make i915_engine_info pretty printer to standalone
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We can use drm_printer to hide the differences between printk and
seq_printf, and so make the i915_engine_info pretty printer able to be
called from different contexts and not just debugfs. For instance, I
want to use the pretty printer to debug kselftests.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171009110301.21705-1-chris@chris-wilson.co.uk
Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com>
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Chris Wilson committed Oct 9, 2017
1 parent bef27bd commit f636edb
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Showing 3 changed files with 168 additions and 144 deletions.
148 changes: 4 additions & 144 deletions drivers/gpu/drm/i915/i915_debugfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3292,9 +3292,9 @@ static int i915_display_info(struct seq_file *m, void *unused)
static int i915_engine_info(struct seq_file *m, void *unused)
{
struct drm_i915_private *dev_priv = node_to_i915(m->private);
struct i915_gpu_error *error = &dev_priv->gpu_error;
struct intel_engine_cs *engine;
enum intel_engine_id id;
struct drm_printer p;

intel_runtime_pm_get(dev_priv);

Expand All @@ -3303,149 +3303,9 @@ static int i915_engine_info(struct seq_file *m, void *unused)
seq_printf(m, "Global active requests: %d\n",
dev_priv->gt.active_requests);

for_each_engine(engine, dev_priv, id) {
struct intel_breadcrumbs *b = &engine->breadcrumbs;
struct drm_i915_gem_request *rq;
struct rb_node *rb;
u64 addr;

seq_printf(m, "%s\n", engine->name);
seq_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [%d ms], inflight %d\n",
intel_engine_get_seqno(engine),
intel_engine_last_submit(engine),
engine->hangcheck.seqno,
jiffies_to_msecs(jiffies - engine->hangcheck.action_timestamp),
engine->timeline->inflight_seqnos);
seq_printf(m, "\tReset count: %d\n",
i915_reset_engine_count(error, engine));

rcu_read_lock();

seq_printf(m, "\tRequests:\n");

rq = list_first_entry(&engine->timeline->requests,
struct drm_i915_gem_request, link);
if (&rq->link != &engine->timeline->requests)
print_request(m, rq, "\t\tfirst ");

rq = list_last_entry(&engine->timeline->requests,
struct drm_i915_gem_request, link);
if (&rq->link != &engine->timeline->requests)
print_request(m, rq, "\t\tlast ");

rq = i915_gem_find_active_request(engine);
if (rq) {
print_request(m, rq, "\t\tactive ");
seq_printf(m,
"\t\t[head %04x, postfix %04x, tail %04x, batch 0x%08x_%08x]\n",
rq->head, rq->postfix, rq->tail,
rq->batch ? upper_32_bits(rq->batch->node.start) : ~0u,
rq->batch ? lower_32_bits(rq->batch->node.start) : ~0u);
}

seq_printf(m, "\tRING_START: 0x%08x [0x%08x]\n",
I915_READ(RING_START(engine->mmio_base)),
rq ? i915_ggtt_offset(rq->ring->vma) : 0);
seq_printf(m, "\tRING_HEAD: 0x%08x [0x%08x]\n",
I915_READ(RING_HEAD(engine->mmio_base)) & HEAD_ADDR,
rq ? rq->ring->head : 0);
seq_printf(m, "\tRING_TAIL: 0x%08x [0x%08x]\n",
I915_READ(RING_TAIL(engine->mmio_base)) & TAIL_ADDR,
rq ? rq->ring->tail : 0);
seq_printf(m, "\tRING_CTL: 0x%08x [%s]\n",
I915_READ(RING_CTL(engine->mmio_base)),
I915_READ(RING_CTL(engine->mmio_base)) & (RING_WAIT | RING_WAIT_SEMAPHORE) ? "waiting" : "");

rcu_read_unlock();

addr = intel_engine_get_active_head(engine);
seq_printf(m, "\tACTHD: 0x%08x_%08x\n",
upper_32_bits(addr), lower_32_bits(addr));
addr = intel_engine_get_last_batch_head(engine);
seq_printf(m, "\tBBADDR: 0x%08x_%08x\n",
upper_32_bits(addr), lower_32_bits(addr));

if (i915_modparams.enable_execlists) {
const u32 *hws = &engine->status_page.page_addr[I915_HWS_CSB_BUF0_INDEX];
struct intel_engine_execlists * const execlists = &engine->execlists;
u32 ptr, read, write;
unsigned int idx;

seq_printf(m, "\tExeclist status: 0x%08x %08x\n",
I915_READ(RING_EXECLIST_STATUS_LO(engine)),
I915_READ(RING_EXECLIST_STATUS_HI(engine)));

ptr = I915_READ(RING_CONTEXT_STATUS_PTR(engine));
read = GEN8_CSB_READ_PTR(ptr);
write = GEN8_CSB_WRITE_PTR(ptr);
seq_printf(m, "\tExeclist CSB read %d [%d cached], write %d [%d from hws], interrupt posted? %s\n",
read, execlists->csb_head,
write,
intel_read_status_page(engine, intel_hws_csb_write_index(engine->i915)),
yesno(test_bit(ENGINE_IRQ_EXECLIST,
&engine->irq_posted)));
if (read >= GEN8_CSB_ENTRIES)
read = 0;
if (write >= GEN8_CSB_ENTRIES)
write = 0;
if (read > write)
write += GEN8_CSB_ENTRIES;
while (read < write) {
idx = ++read % GEN8_CSB_ENTRIES;
seq_printf(m, "\tExeclist CSB[%d]: 0x%08x [0x%08x in hwsp], context: %d [%d in hwsp]\n",
idx,
I915_READ(RING_CONTEXT_STATUS_BUF_LO(engine, idx)),
hws[idx * 2],
I915_READ(RING_CONTEXT_STATUS_BUF_HI(engine, idx)),
hws[idx * 2 + 1]);
}

rcu_read_lock();
for (idx = 0; idx < execlists_num_ports(execlists); idx++) {
unsigned int count;

rq = port_unpack(&execlists->port[idx], &count);
if (rq) {
seq_printf(m, "\t\tELSP[%d] count=%d, ",
idx, count);
print_request(m, rq, "rq: ");
} else {
seq_printf(m, "\t\tELSP[%d] idle\n",
idx);
}
}
rcu_read_unlock();

spin_lock_irq(&engine->timeline->lock);
for (rb = execlists->first; rb; rb = rb_next(rb)) {
struct i915_priolist *p =
rb_entry(rb, typeof(*p), node);

list_for_each_entry(rq, &p->requests,
priotree.link)
print_request(m, rq, "\t\tQ ");
}
spin_unlock_irq(&engine->timeline->lock);
} else if (INTEL_GEN(dev_priv) > 6) {
seq_printf(m, "\tPP_DIR_BASE: 0x%08x\n",
I915_READ(RING_PP_DIR_BASE(engine)));
seq_printf(m, "\tPP_DIR_BASE_READ: 0x%08x\n",
I915_READ(RING_PP_DIR_BASE_READ(engine)));
seq_printf(m, "\tPP_DIR_DCLV: 0x%08x\n",
I915_READ(RING_PP_DIR_DCLV(engine)));
}

spin_lock_irq(&b->rb_lock);
for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) {
struct intel_wait *w = rb_entry(rb, typeof(*w), node);

seq_printf(m, "\t%s [%d] waiting for %x\n",
w->tsk->comm, w->tsk->pid, w->seqno);
}
spin_unlock_irq(&b->rb_lock);

seq_puts(m, "\n");
}
p = drm_seq_file_printer(m);
for_each_engine(engine, dev_priv, id)
intel_engine_dump(engine, &p);

intel_runtime_pm_put(dev_priv);

Expand Down
160 changes: 160 additions & 0 deletions drivers/gpu/drm/i915/intel_engine_cs.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,8 @@
*
*/

#include <drm/drm_print.h>

#include "i915_drv.h"
#include "intel_ringbuffer.h"
#include "intel_lrc.h"
Expand Down Expand Up @@ -1616,6 +1618,164 @@ bool intel_engine_can_store_dword(struct intel_engine_cs *engine)
}
}

static void print_request(struct drm_printer *m,
struct drm_i915_gem_request *rq,
const char *prefix)
{
drm_printf(m, "%s%x [%x:%x] prio=%d @ %dms: %s\n", prefix,
rq->global_seqno, rq->ctx->hw_id, rq->fence.seqno,
rq->priotree.priority,
jiffies_to_msecs(jiffies - rq->emitted_jiffies),
rq->timeline->common->name);
}

void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *m)
{
struct intel_breadcrumbs *b = &engine->breadcrumbs;
struct i915_gpu_error *error = &engine->i915->gpu_error;
struct drm_i915_private *dev_priv = engine->i915;
struct drm_i915_gem_request *rq;
struct rb_node *rb;
u64 addr;

drm_printf(m, "%s\n", engine->name);
drm_printf(m, "\tcurrent seqno %x, last %x, hangcheck %x [%d ms], inflight %d\n",
intel_engine_get_seqno(engine),
intel_engine_last_submit(engine),
engine->hangcheck.seqno,
jiffies_to_msecs(jiffies - engine->hangcheck.action_timestamp),
engine->timeline->inflight_seqnos);
drm_printf(m, "\tReset count: %d\n",
i915_reset_engine_count(error, engine));

rcu_read_lock();

drm_printf(m, "\tRequests:\n");

rq = list_first_entry(&engine->timeline->requests,
struct drm_i915_gem_request, link);
if (&rq->link != &engine->timeline->requests)
print_request(m, rq, "\t\tfirst ");

rq = list_last_entry(&engine->timeline->requests,
struct drm_i915_gem_request, link);
if (&rq->link != &engine->timeline->requests)
print_request(m, rq, "\t\tlast ");

rq = i915_gem_find_active_request(engine);
if (rq) {
print_request(m, rq, "\t\tactive ");
drm_printf(m,
"\t\t[head %04x, postfix %04x, tail %04x, batch 0x%08x_%08x]\n",
rq->head, rq->postfix, rq->tail,
rq->batch ? upper_32_bits(rq->batch->node.start) : ~0u,
rq->batch ? lower_32_bits(rq->batch->node.start) : ~0u);
}

drm_printf(m, "\tRING_START: 0x%08x [0x%08x]\n",
I915_READ(RING_START(engine->mmio_base)),
rq ? i915_ggtt_offset(rq->ring->vma) : 0);
drm_printf(m, "\tRING_HEAD: 0x%08x [0x%08x]\n",
I915_READ(RING_HEAD(engine->mmio_base)) & HEAD_ADDR,
rq ? rq->ring->head : 0);
drm_printf(m, "\tRING_TAIL: 0x%08x [0x%08x]\n",
I915_READ(RING_TAIL(engine->mmio_base)) & TAIL_ADDR,
rq ? rq->ring->tail : 0);
drm_printf(m, "\tRING_CTL: 0x%08x [%s]\n",
I915_READ(RING_CTL(engine->mmio_base)),
I915_READ(RING_CTL(engine->mmio_base)) & (RING_WAIT | RING_WAIT_SEMAPHORE) ? "waiting" : "");

rcu_read_unlock();

addr = intel_engine_get_active_head(engine);
drm_printf(m, "\tACTHD: 0x%08x_%08x\n",
upper_32_bits(addr), lower_32_bits(addr));
addr = intel_engine_get_last_batch_head(engine);
drm_printf(m, "\tBBADDR: 0x%08x_%08x\n",
upper_32_bits(addr), lower_32_bits(addr));

if (i915_modparams.enable_execlists) {
const u32 *hws = &engine->status_page.page_addr[I915_HWS_CSB_BUF0_INDEX];
struct intel_engine_execlists * const execlists = &engine->execlists;
u32 ptr, read, write;
unsigned int idx;

drm_printf(m, "\tExeclist status: 0x%08x %08x\n",
I915_READ(RING_EXECLIST_STATUS_LO(engine)),
I915_READ(RING_EXECLIST_STATUS_HI(engine)));

ptr = I915_READ(RING_CONTEXT_STATUS_PTR(engine));
read = GEN8_CSB_READ_PTR(ptr);
write = GEN8_CSB_WRITE_PTR(ptr);
drm_printf(m, "\tExeclist CSB read %d [%d cached], write %d [%d from hws], interrupt posted? %s\n",
read, execlists->csb_head,
write,
intel_read_status_page(engine, intel_hws_csb_write_index(engine->i915)),
yesno(test_bit(ENGINE_IRQ_EXECLIST,
&engine->irq_posted)));
if (read >= GEN8_CSB_ENTRIES)
read = 0;
if (write >= GEN8_CSB_ENTRIES)
write = 0;
if (read > write)
write += GEN8_CSB_ENTRIES;
while (read < write) {
idx = ++read % GEN8_CSB_ENTRIES;
drm_printf(m, "\tExeclist CSB[%d]: 0x%08x [0x%08x in hwsp], context: %d [%d in hwsp]\n",
idx,
I915_READ(RING_CONTEXT_STATUS_BUF_LO(engine, idx)),
hws[idx * 2],
I915_READ(RING_CONTEXT_STATUS_BUF_HI(engine, idx)),
hws[idx * 2 + 1]);
}

rcu_read_lock();
for (idx = 0; idx < execlists_num_ports(execlists); idx++) {
unsigned int count;

rq = port_unpack(&execlists->port[idx], &count);
if (rq) {
drm_printf(m, "\t\tELSP[%d] count=%d, ",
idx, count);
print_request(m, rq, "rq: ");
} else {
drm_printf(m, "\t\tELSP[%d] idle\n",
idx);
}
}
rcu_read_unlock();

spin_lock_irq(&engine->timeline->lock);
for (rb = execlists->first; rb; rb = rb_next(rb)) {
struct i915_priolist *p =
rb_entry(rb, typeof(*p), node);

list_for_each_entry(rq, &p->requests,
priotree.link)
print_request(m, rq, "\t\tQ ");
}
spin_unlock_irq(&engine->timeline->lock);
} else if (INTEL_GEN(dev_priv) > 6) {
drm_printf(m, "\tPP_DIR_BASE: 0x%08x\n",
I915_READ(RING_PP_DIR_BASE(engine)));
drm_printf(m, "\tPP_DIR_BASE_READ: 0x%08x\n",
I915_READ(RING_PP_DIR_BASE_READ(engine)));
drm_printf(m, "\tPP_DIR_DCLV: 0x%08x\n",
I915_READ(RING_PP_DIR_DCLV(engine)));
}

spin_lock_irq(&b->rb_lock);
for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) {
struct intel_wait *w = rb_entry(rb, typeof(*w), node);

drm_printf(m, "\t%s [%d] waiting for %x\n",
w->tsk->comm, w->tsk->pid, w->seqno);
}
spin_unlock_irq(&b->rb_lock);

drm_printf(m, "\n");
}

#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/mock_engine.c"
#endif
4 changes: 4 additions & 0 deletions drivers/gpu/drm/i915/intel_ringbuffer.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@
#include "i915_gem_timeline.h"
#include "i915_selftest.h"

struct drm_printer;

#define I915_CMD_HASH_ORDER 9

/* Early gen2 devices have a cacheline of just 32 bytes, using 64 is overkill,
Expand Down Expand Up @@ -839,4 +841,6 @@ void intel_engines_reset_default_submission(struct drm_i915_private *i915);

bool intel_engine_can_store_dword(struct intel_engine_cs *engine);

void intel_engine_dump(struct intel_engine_cs *engine, struct drm_printer *p);

#endif /* _INTEL_RINGBUFFER_H_ */

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