diff options
author | Zhao Yan <yan.y.zhao@intel.com> | 2018-04-04 13:57:09 +0800 |
---|---|---|
committer | Zhi Wang <zhi.a.wang@intel.com> | 2018-04-23 13:09:34 +0800 |
commit | 96bebe39b2f4533af14c509061cd2b551ca81e8d (patch) | |
tree | d023010854e1a90447ba0143e643c69d1ec3524d /drivers/gpu/drm/i915 | |
parent | 89babe7cf18e4f93c6ba1e6abfe2e5aa5e4fc66c (diff) | |
download | linux-96bebe39b2f4533af14c509061cd2b551ca81e8d.tar.bz2 |
drm/i915/gvt: scan non-privileged batch buffer for debug purpose
For perfomance purpose, scanning of non-privileged batch buffer is turned
off by default. But for debugging purpose, it can be turned on via debugfs.
After scanning, we submit the original non-privileged batch buffer into
hardware, so that the scanning is only a peeking window of guest submitted
commands and will not affect the execution results.
v4:
- refine debugfs print format&content (zhenyu wang)
- print engine id instread of engine name to prevent potential memory leak
in debugfs warning message. (zhenyu wang)
v3:
- change vgpu->scan_nonprivbb from type bool to u32, so it is able to
selectively turn on/off scanning of non-privileged batch buffer on engine
level. e.g.
if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer
on engine 0 and 1.
- in debugfs interface to set vgpu->scan_nonprivbb, print warning message
to warn user and explicitly tell state change in kernel log (zhenyu wang)
v2:
- rebase
- update comments for start_gma_offset (henry)
Signed-off-by: Zhao Yan <yan.y.zhao@intel.com>
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915')
-rw-r--r-- | drivers/gpu/drm/i915/gvt/cmd_parser.c | 55 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gvt/debugfs.c | 67 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gvt/gvt.h | 1 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gvt/scheduler.c | 64 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gvt/scheduler.h | 1 | ||||
-rw-r--r-- | drivers/gpu/drm/i915/gvt/trace.h | 24 |
6 files changed, 173 insertions, 39 deletions
diff --git a/drivers/gpu/drm/i915/gvt/cmd_parser.c b/drivers/gpu/drm/i915/gvt/cmd_parser.c index db6b94dda5df..9ec2cd982705 100644 --- a/drivers/gpu/drm/i915/gvt/cmd_parser.c +++ b/drivers/gpu/drm/i915/gvt/cmd_parser.c @@ -1603,7 +1603,8 @@ static int batch_buffer_needs_scan(struct parser_exec_state *s) if (IS_BROADWELL(gvt->dev_priv) || IS_SKYLAKE(gvt->dev_priv) || IS_KABYLAKE(gvt->dev_priv)) { /* BDW decides privilege based on address space */ - if (cmd_val(s, 0) & (1 << 8)) + if (cmd_val(s, 0) & (1 << 8) && + !(s->vgpu->scan_nonprivbb & (1 << s->ring_id))) return 0; } return 1; @@ -1617,6 +1618,8 @@ static int find_bb_size(struct parser_exec_state *s, unsigned long *bb_size) bool bb_end = false; struct intel_vgpu *vgpu = s->vgpu; u32 cmd; + struct intel_vgpu_mm *mm = (s->buf_addr_type == GTT_BUFFER) ? + s->vgpu->gtt.ggtt_mm : s->workload->shadow_mm; *bb_size = 0; @@ -1628,18 +1631,22 @@ static int find_bb_size(struct parser_exec_state *s, unsigned long *bb_size) cmd = cmd_val(s, 0); info = get_cmd_info(s->vgpu->gvt, cmd, s->ring_id); if (info == NULL) { - gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x\n", - cmd, get_opcode(cmd, s->ring_id)); + gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %d, workload=%p\n", + cmd, get_opcode(cmd, s->ring_id), + (s->buf_addr_type == PPGTT_BUFFER) ? + "ppgtt" : "ggtt", s->ring_id, s->workload); return -EBADRQC; } do { - if (copy_gma_to_hva(s->vgpu, s->vgpu->gtt.ggtt_mm, + if (copy_gma_to_hva(s->vgpu, mm, gma, gma + 4, &cmd) < 0) return -EFAULT; info = get_cmd_info(s->vgpu->gvt, cmd, s->ring_id); if (info == NULL) { - gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x\n", - cmd, get_opcode(cmd, s->ring_id)); + gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %d, workload=%p\n", + cmd, get_opcode(cmd, s->ring_id), + (s->buf_addr_type == PPGTT_BUFFER) ? + "ppgtt" : "ggtt", s->ring_id, s->workload); return -EBADRQC; } @@ -1665,6 +1672,9 @@ static int perform_bb_shadow(struct parser_exec_state *s) unsigned long gma = 0; unsigned long bb_size; int ret = 0; + struct intel_vgpu_mm *mm = (s->buf_addr_type == GTT_BUFFER) ? + s->vgpu->gtt.ggtt_mm : s->workload->shadow_mm; + unsigned long gma_start_offset = 0; /* get the start gm address of the batch buffer */ gma = get_gma_bb_from_cmd(s, 1); @@ -1679,8 +1689,24 @@ static int perform_bb_shadow(struct parser_exec_state *s) if (!bb) return -ENOMEM; + bb->ppgtt = (s->buf_addr_type == GTT_BUFFER) ? false : true; + + /* the gma_start_offset stores the batch buffer's start gma's + * offset relative to page boundary. so for non-privileged batch + * buffer, the shadowed gem object holds exactly the same page + * layout as original gem object. This is for the convience of + * replacing the whole non-privilged batch buffer page to this + * shadowed one in PPGTT at the same gma address. (this replacing + * action is not implemented yet now, but may be necessary in + * future). + * for prileged batch buffer, we just change start gma address to + * that of shadowed page. + */ + if (bb->ppgtt) + gma_start_offset = gma & ~I915_GTT_PAGE_MASK; + bb->obj = i915_gem_object_create(s->vgpu->gvt->dev_priv, - roundup(bb_size, PAGE_SIZE)); + roundup(bb_size + gma_start_offset, PAGE_SIZE)); if (IS_ERR(bb->obj)) { ret = PTR_ERR(bb->obj); goto err_free_bb; @@ -1701,9 +1727,9 @@ static int perform_bb_shadow(struct parser_exec_state *s) bb->clflush &= ~CLFLUSH_BEFORE; } - ret = copy_gma_to_hva(s->vgpu, s->vgpu->gtt.ggtt_mm, + ret = copy_gma_to_hva(s->vgpu, mm, gma, gma + bb_size, - bb->va); + bb->va + gma_start_offset); if (ret < 0) { gvt_vgpu_err("fail to copy guest ring buffer\n"); ret = -EFAULT; @@ -1729,7 +1755,7 @@ static int perform_bb_shadow(struct parser_exec_state *s) * buffer's gma in pair. After all, we don't want to pin the shadow * buffer here (too early). */ - s->ip_va = bb->va; + s->ip_va = bb->va + gma_start_offset; s->ip_gma = gma; return 0; err_unmap: @@ -2468,15 +2494,18 @@ static int cmd_parser_exec(struct parser_exec_state *s) info = get_cmd_info(s->vgpu->gvt, cmd, s->ring_id); if (info == NULL) { - gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x\n", - cmd, get_opcode(cmd, s->ring_id)); + gvt_vgpu_err("unknown cmd 0x%x, opcode=0x%x, addr_type=%s, ring %d, workload=%p\n", + cmd, get_opcode(cmd, s->ring_id), + (s->buf_addr_type == PPGTT_BUFFER) ? + "ppgtt" : "ggtt", s->ring_id, s->workload); return -EBADRQC; } s->info = info; trace_gvt_command(vgpu->id, s->ring_id, s->ip_gma, s->ip_va, - cmd_length(s), s->buf_type); + cmd_length(s), s->buf_type, s->buf_addr_type, + s->workload, info->name); if (info->handler) { ret = info->handler(s); diff --git a/drivers/gpu/drm/i915/gvt/debugfs.c b/drivers/gpu/drm/i915/gvt/debugfs.c index f7d0078eb61b..2ec89bcb59f1 100644 --- a/drivers/gpu/drm/i915/gvt/debugfs.c +++ b/drivers/gpu/drm/i915/gvt/debugfs.c @@ -124,6 +124,68 @@ static int vgpu_mmio_diff_show(struct seq_file *s, void *unused) } DEFINE_SHOW_ATTRIBUTE(vgpu_mmio_diff); +static int +vgpu_scan_nonprivbb_get(void *data, u64 *val) +{ + struct intel_vgpu *vgpu = (struct intel_vgpu *)data; + *val = vgpu->scan_nonprivbb; + return 0; +} + +/* + * set/unset bit engine_id of vgpu->scan_nonprivbb to turn on/off scanning + * of non-privileged batch buffer. e.g. + * if vgpu->scan_nonprivbb=3, then it will scan non-privileged batch buffer + * on engine 0 and 1. + */ +static int +vgpu_scan_nonprivbb_set(void *data, u64 val) +{ + struct intel_vgpu *vgpu = (struct intel_vgpu *)data; + struct drm_i915_private *dev_priv = vgpu->gvt->dev_priv; + enum intel_engine_id id; + char buf[128], *s; + int len; + + val &= (1 << I915_NUM_ENGINES) - 1; + + if (vgpu->scan_nonprivbb == val) + return 0; + + if (!val) + goto done; + + len = sprintf(buf, + "gvt: vgpu %d turns on non-privileged batch buffers scanning on Engines:", + vgpu->id); + + s = buf + len; + + for (id = 0; id < I915_NUM_ENGINES; id++) { + struct intel_engine_cs *engine; + + engine = dev_priv->engine[id]; + if (engine && (val & (1 << id))) { + len = snprintf(s, 4, "%d, ", engine->id); + s += len; + } else + val &= ~(1 << id); + } + + if (val) + sprintf(s, "low performance expected."); + + pr_warn("%s\n", buf); + +done: + vgpu->scan_nonprivbb = val; + return 0; +} + +DEFINE_SIMPLE_ATTRIBUTE(vgpu_scan_nonprivbb_fops, + vgpu_scan_nonprivbb_get, vgpu_scan_nonprivbb_set, + "0x%llx\n"); + /** * intel_gvt_debugfs_add_vgpu - register debugfs entries for a vGPU * @vgpu: a vGPU @@ -151,6 +213,11 @@ int intel_gvt_debugfs_add_vgpu(struct intel_vgpu *vgpu) if (!ent) return -ENOMEM; + ent = debugfs_create_file("scan_nonprivbb", 0644, vgpu->debugfs, + vgpu, &vgpu_scan_nonprivbb_fops); + if (!ent) + return -ENOMEM; + return 0; } diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h index efacd8abbedc..6ec888822a0f 100644 --- a/drivers/gpu/drm/i915/gvt/gvt.h +++ b/drivers/gpu/drm/i915/gvt/gvt.h @@ -226,6 +226,7 @@ struct intel_vgpu { struct completion vblank_done; + u32 scan_nonprivbb; }; /* validating GM healthy status*/ diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c index 638abe84857c..1bd7aa0c694a 100644 --- a/drivers/gpu/drm/i915/gvt/scheduler.c +++ b/drivers/gpu/drm/i915/gvt/scheduler.c @@ -452,12 +452,6 @@ static int prepare_shadow_batch_buffer(struct intel_vgpu_workload *workload) int ret; list_for_each_entry(bb, &workload->shadow_bb, list) { - bb->vma = i915_gem_object_ggtt_pin(bb->obj, NULL, 0, 0, 0); - if (IS_ERR(bb->vma)) { - ret = PTR_ERR(bb->vma); - goto err; - } - /* For privilge batch buffer and not wa_ctx, the bb_start_cmd_va * is only updated into ring_scan_buffer, not real ring address * allocated in later copy_workload_to_ring_buffer. pls be noted @@ -469,25 +463,53 @@ static int prepare_shadow_batch_buffer(struct intel_vgpu_workload *workload) bb->bb_start_cmd_va = workload->shadow_ring_buffer_va + bb->bb_offset; - /* relocate shadow batch buffer */ - bb->bb_start_cmd_va[1] = i915_ggtt_offset(bb->vma); - if (gmadr_bytes == 8) - bb->bb_start_cmd_va[2] = 0; + if (bb->ppgtt) { + /* for non-priv bb, scan&shadow is only for + * debugging purpose, so the content of shadow bb + * is the same as original bb. Therefore, + * here, rather than switch to shadow bb's gma + * address, we directly use original batch buffer's + * gma address, and send original bb to hardware + * directly + */ + if (bb->clflush & CLFLUSH_AFTER) { + drm_clflush_virt_range(bb->va, + bb->obj->base.size); + bb->clflush &= ~CLFLUSH_AFTER; + } + i915_gem_obj_finish_shmem_access(bb->obj); + bb->accessing = false; + + } else { + bb->vma = i915_gem_object_ggtt_pin(bb->obj, + NULL, 0, 0, 0); + if (IS_ERR(bb->vma)) { + ret = PTR_ERR(bb->vma); + goto err; + } - /* No one is going to touch shadow bb from now on. */ - if (bb->clflush & CLFLUSH_AFTER) { - drm_clflush_virt_range(bb->va, bb->obj->base.size); - bb->clflush &= ~CLFLUSH_AFTER; - } + /* relocate shadow batch buffer */ + bb->bb_start_cmd_va[1] = i915_ggtt_offset(bb->vma); + if (gmadr_bytes == 8) + bb->bb_start_cmd_va[2] = 0; - ret = i915_gem_object_set_to_gtt_domain(bb->obj, false); - if (ret) - goto err; + /* No one is going to touch shadow bb from now on. */ + if (bb->clflush & CLFLUSH_AFTER) { + drm_clflush_virt_range(bb->va, + bb->obj->base.size); + bb->clflush &= ~CLFLUSH_AFTER; + } - i915_gem_obj_finish_shmem_access(bb->obj); - bb->accessing = false; + ret = i915_gem_object_set_to_gtt_domain(bb->obj, + false); + if (ret) + goto err; - i915_vma_move_to_active(bb->vma, workload->req, 0); + i915_gem_obj_finish_shmem_access(bb->obj); + bb->accessing = false; + + i915_vma_move_to_active(bb->vma, workload->req, 0); + } } return 0; err: diff --git a/drivers/gpu/drm/i915/gvt/scheduler.h b/drivers/gpu/drm/i915/gvt/scheduler.h index 486ed57a4ad1..6c644782193e 100644 --- a/drivers/gpu/drm/i915/gvt/scheduler.h +++ b/drivers/gpu/drm/i915/gvt/scheduler.h @@ -125,6 +125,7 @@ struct intel_vgpu_shadow_bb { unsigned int clflush; bool accessing; unsigned long bb_offset; + bool ppgtt; }; #define workload_q_head(vgpu, ring_id) \ diff --git a/drivers/gpu/drm/i915/gvt/trace.h b/drivers/gpu/drm/i915/gvt/trace.h index 82093f1e8612..1fd64202d74e 100644 --- a/drivers/gpu/drm/i915/gvt/trace.h +++ b/drivers/gpu/drm/i915/gvt/trace.h @@ -224,19 +224,25 @@ TRACE_EVENT(oos_sync, TP_printk("%s", __entry->buf) ); +#define GVT_CMD_STR_LEN 40 TRACE_EVENT(gvt_command, - TP_PROTO(u8 vgpu_id, u8 ring_id, u32 ip_gma, u32 *cmd_va, u32 cmd_len, - u32 buf_type), + TP_PROTO(u8 vgpu_id, u8 ring_id, u32 ip_gma, u32 *cmd_va, + u32 cmd_len, u32 buf_type, u32 buf_addr_type, + void *workload, char *cmd_name), - TP_ARGS(vgpu_id, ring_id, ip_gma, cmd_va, cmd_len, buf_type), + TP_ARGS(vgpu_id, ring_id, ip_gma, cmd_va, cmd_len, buf_type, + buf_addr_type, workload, cmd_name), TP_STRUCT__entry( __field(u8, vgpu_id) __field(u8, ring_id) __field(u32, ip_gma) __field(u32, buf_type) + __field(u32, buf_addr_type) __field(u32, cmd_len) + __field(void*, workload) __dynamic_array(u32, raw_cmd, cmd_len) + __array(char, cmd_name, GVT_CMD_STR_LEN) ), TP_fast_assign( @@ -244,17 +250,25 @@ TRACE_EVENT(gvt_command, __entry->ring_id = ring_id; __entry->ip_gma = ip_gma; __entry->buf_type = buf_type; + __entry->buf_addr_type = buf_addr_type; __entry->cmd_len = cmd_len; + __entry->workload = workload; + snprintf(__entry->cmd_name, GVT_CMD_STR_LEN, "%s", cmd_name); memcpy(__get_dynamic_array(raw_cmd), cmd_va, cmd_len * sizeof(*cmd_va)); ), - TP_printk("vgpu%d ring %d: buf_type %u, ip_gma %08x, raw cmd %s", + TP_printk("vgpu%d ring %d: address_type %u, buf_type %u, ip_gma %08x,cmd (name=%s,len=%u,raw cmd=%s), workload=%p\n", __entry->vgpu_id, __entry->ring_id, + __entry->buf_addr_type, __entry->buf_type, __entry->ip_gma, - __print_array(__get_dynamic_array(raw_cmd), __entry->cmd_len, 4)) + __entry->cmd_name, + __entry->cmd_len, + __print_array(__get_dynamic_array(raw_cmd), + __entry->cmd_len, 4), + __entry->workload) ); #define GVT_TEMP_STR_LEN 10 |