[PATCH] drm/xe/rtp: Drop sentinel from xe_rtp_process_to_sr()
Lucas De Marchi
lucas.demarchi at intel.com
Fri Mar 7 04:00:04 UTC 2025
There's a mismatch on API: while xe_rtp_process_to_sr() processes
entries until an entry without name, the active tracking with
xe_rtp_process_ctx_enable_active_tracking() needs to use the number of
elements. The number of elements is taken everywhere using ARRAY_SIZE(),
but that will have one entry too many. This leads to the following
warning, as reported by lkp:
drivers/gpu/drm/xe/xe_tuning.c: In function 'xe_tuning_dump':
>> include/drm/drm_print.h:228:31: warning: '%s' directive argument is null [-Wformat-overflow=]
228 | drm_printf((printer), "%.*s" fmt, (indent), "\t\t\t\t\tX", ##__VA_ARGS__)
| ^~~~~~
drivers/gpu/drm/xe/xe_tuning.c:226:17: note: in expansion of macro 'drm_printf_indent'
226 | drm_printf_indent(p, 1, "%s\n", engine_tunings[idx].name);
| ^~~~~~~~~~~~~~~~~
That's because it will still process the last entry when tracking the
active tunings. The same issue exists in the WAs. Change
xe_rtp_process_to_sr() to also take the number of elements so the empty
entry can be removed and the warning should go away. Fixing on the
active-tracking side would more fragile as the it would need a `- 1`
everywhere and continue to use a different approach for number of
elements.
Aside from the warning, it's a non-issue as there would always be enough
bits allocated and the last entry would never be active since
xe_rtp_process_to_sr() stops on the sentinel.
Reported-by: kernel test robot <lkp at intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202503021906.P2MwAvyK-lkp@intel.com/
Cc: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
---
drivers/gpu/drm/xe/tests/xe_rtp_test.c | 2 +-
drivers/gpu/drm/xe/xe_hw_engine.c | 6 ++----
drivers/gpu/drm/xe/xe_reg_whitelist.c | 4 ++--
drivers/gpu/drm/xe/xe_rtp.c | 6 +++++-
drivers/gpu/drm/xe/xe_rtp.h | 2 +-
drivers/gpu/drm/xe/xe_tuning.c | 12 ++++--------
drivers/gpu/drm/xe/xe_wa.c | 12 +++---------
7 files changed, 18 insertions(+), 26 deletions(-)
diff --git a/drivers/gpu/drm/xe/tests/xe_rtp_test.c b/drivers/gpu/drm/xe/tests/xe_rtp_test.c
index 36a3b5420fef6a1977a04d169d4946f75ee523c4..b0254b014fe45013aa0c5b3fbbe7a58fe8584a31 100644
--- a/drivers/gpu/drm/xe/tests/xe_rtp_test.c
+++ b/drivers/gpu/drm/xe/tests/xe_rtp_test.c
@@ -320,7 +320,7 @@ static void xe_rtp_process_to_sr_tests(struct kunit *test)
count_rtp_entries++;
xe_rtp_process_ctx_enable_active_tracking(&ctx, &active, count_rtp_entries);
- xe_rtp_process_to_sr(&ctx, param->entries, reg_sr);
+ xe_rtp_process_to_sr(&ctx, param->entries, count_rtp_entries, reg_sr);
xa_for_each(®_sr->xa, idx, sre) {
if (idx == param->expected_reg.addr)
diff --git a/drivers/gpu/drm/xe/xe_hw_engine.c b/drivers/gpu/drm/xe/xe_hw_engine.c
index fc447751fe786c0035d888047a856780a572e526..223b95de388cb8919a7d1ab52e1305be990672ad 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine.c
+++ b/drivers/gpu/drm/xe/xe_hw_engine.c
@@ -400,10 +400,9 @@ xe_hw_engine_setup_default_lrc_state(struct xe_hw_engine *hwe)
PREEMPT_GPGPU_THREAD_GROUP_LEVEL)),
XE_RTP_ENTRY_FLAG(FOREACH_ENGINE)
},
- {}
};
- xe_rtp_process_to_sr(&ctx, lrc_setup, &hwe->reg_lrc);
+ xe_rtp_process_to_sr(&ctx, lrc_setup, ARRAY_SIZE(lrc_setup), &hwe->reg_lrc);
}
static void
@@ -459,10 +458,9 @@ hw_engine_setup_default_state(struct xe_hw_engine *hwe)
XE_RTP_ACTIONS(SET(CSFE_CHICKEN1(0), CS_PRIORITY_MEM_READ,
XE_RTP_ACTION_FLAG(ENGINE_BASE)))
},
- {}
};
- xe_rtp_process_to_sr(&ctx, engine_entries, &hwe->reg_sr);
+ xe_rtp_process_to_sr(&ctx, engine_entries, ARRAY_SIZE(engine_entries), &hwe->reg_sr);
}
static const struct engine_info *find_engine_info(enum xe_engine_class class, int instance)
diff --git a/drivers/gpu/drm/xe/xe_reg_whitelist.c b/drivers/gpu/drm/xe/xe_reg_whitelist.c
index edab5d4e3ba5e7708565f8bc51df50c0b4a46f39..23f6c81d99946f97413e411289116aaa10365f3f 100644
--- a/drivers/gpu/drm/xe/xe_reg_whitelist.c
+++ b/drivers/gpu/drm/xe/xe_reg_whitelist.c
@@ -88,7 +88,6 @@ static const struct xe_rtp_entry_sr register_whitelist[] = {
RING_FORCE_TO_NONPRIV_ACCESS_RD |
RING_FORCE_TO_NONPRIV_RANGE_4))
},
- {}
};
static void whitelist_apply_to_hwe(struct xe_hw_engine *hwe)
@@ -137,7 +136,8 @@ void xe_reg_whitelist_process_engine(struct xe_hw_engine *hwe)
{
struct xe_rtp_process_ctx ctx = XE_RTP_PROCESS_CTX_INITIALIZER(hwe);
- xe_rtp_process_to_sr(&ctx, register_whitelist, &hwe->reg_whitelist);
+ xe_rtp_process_to_sr(&ctx, register_whitelist, ARRAY_SIZE(register_whitelist),
+ &hwe->reg_whitelist);
whitelist_apply_to_hwe(hwe);
}
diff --git a/drivers/gpu/drm/xe/xe_rtp.c b/drivers/gpu/drm/xe/xe_rtp.c
index 7a1c78fdfc92ee9a7e8862c2a65ce99b1f2a5ff1..13bb62d3e615e89d1e996692732b1859561ac55e 100644
--- a/drivers/gpu/drm/xe/xe_rtp.c
+++ b/drivers/gpu/drm/xe/xe_rtp.c
@@ -237,6 +237,7 @@ static void rtp_mark_active(struct xe_device *xe,
* the save-restore argument.
* @ctx: The context for processing the table, with one of device, gt or hwe
* @entries: Table with RTP definitions
+ * @n_entries: Number of entries to process, usually ARRAY_SIZE(entries)
* @sr: Save-restore struct where matching rules execute the action. This can be
* viewed as the "coalesced view" of multiple the tables. The bits for each
* register set are expected not to collide with previously added entries
@@ -247,6 +248,7 @@ static void rtp_mark_active(struct xe_device *xe,
*/
void xe_rtp_process_to_sr(struct xe_rtp_process_ctx *ctx,
const struct xe_rtp_entry_sr *entries,
+ size_t n_entries,
struct xe_reg_sr *sr)
{
const struct xe_rtp_entry_sr *entry;
@@ -259,7 +261,9 @@ void xe_rtp_process_to_sr(struct xe_rtp_process_ctx *ctx,
if (IS_SRIOV_VF(xe))
return;
- for (entry = entries; entry && entry->name; entry++) {
+ xe_assert(xe, entries);
+
+ for (entry = entries; entry - entries < n_entries; entry++) {
bool match = false;
if (entry->flags & XE_RTP_ENTRY_FLAG_FOREACH_ENGINE) {
diff --git a/drivers/gpu/drm/xe/xe_rtp.h b/drivers/gpu/drm/xe/xe_rtp.h
index 38b9f13bba5e54f9c6e863bb578c00fce7a8c452..4fe736a11c42b954c2256fa21a49b0c2e39901e2 100644
--- a/drivers/gpu/drm/xe/xe_rtp.h
+++ b/drivers/gpu/drm/xe/xe_rtp.h
@@ -430,7 +430,7 @@ void xe_rtp_process_ctx_enable_active_tracking(struct xe_rtp_process_ctx *ctx,
void xe_rtp_process_to_sr(struct xe_rtp_process_ctx *ctx,
const struct xe_rtp_entry_sr *entries,
- struct xe_reg_sr *sr);
+ size_t n_entries, struct xe_reg_sr *sr);
void xe_rtp_process(struct xe_rtp_process_ctx *ctx,
const struct xe_rtp_entry *entries);
diff --git a/drivers/gpu/drm/xe/xe_tuning.c b/drivers/gpu/drm/xe/xe_tuning.c
index 77bc958f5a42cd017d3c363825dfd05cd73f872e..49ddbda7cdef66da49469b687b2296cc2d00b283 100644
--- a/drivers/gpu/drm/xe/xe_tuning.c
+++ b/drivers/gpu/drm/xe/xe_tuning.c
@@ -85,8 +85,6 @@ static const struct xe_rtp_entry_sr gt_tunings[] = {
XE_RTP_RULES(MEDIA_VERSION(2000)),
XE_RTP_ACTIONS(SET(XE2LPM_SCRATCH3_LBCF, RWFLUSHALLEN))
},
-
- {}
};
static const struct xe_rtp_entry_sr engine_tunings[] = {
@@ -100,7 +98,6 @@ static const struct xe_rtp_entry_sr engine_tunings[] = {
ENGINE_CLASS(RENDER)),
XE_RTP_ACTIONS(SET(SAMPLER_MODE, INDIRECT_STATE_BASE_ADDR_OVERRIDE))
},
- {}
};
static const struct xe_rtp_entry_sr lrc_tunings[] = {
@@ -138,8 +135,6 @@ static const struct xe_rtp_entry_sr lrc_tunings[] = {
XE_RTP_ACTIONS(FIELD_SET(FF_MODE, VS_HIT_MAX_VALUE_MASK,
REG_FIELD_PREP(VS_HIT_MAX_VALUE_MASK, 0x3f)))
},
-
- {}
};
/**
@@ -180,7 +175,7 @@ void xe_tuning_process_gt(struct xe_gt *gt)
xe_rtp_process_ctx_enable_active_tracking(&ctx,
gt->tuning_active.gt,
ARRAY_SIZE(gt_tunings));
- xe_rtp_process_to_sr(&ctx, gt_tunings, >->reg_sr);
+ xe_rtp_process_to_sr(&ctx, gt_tunings, ARRAY_SIZE(gt_tunings), >->reg_sr);
}
EXPORT_SYMBOL_IF_KUNIT(xe_tuning_process_gt);
@@ -191,7 +186,8 @@ void xe_tuning_process_engine(struct xe_hw_engine *hwe)
xe_rtp_process_ctx_enable_active_tracking(&ctx,
hwe->gt->tuning_active.engine,
ARRAY_SIZE(engine_tunings));
- xe_rtp_process_to_sr(&ctx, engine_tunings, &hwe->reg_sr);
+ xe_rtp_process_to_sr(&ctx, engine_tunings, ARRAY_SIZE(engine_tunings),
+ &hwe->reg_sr);
}
EXPORT_SYMBOL_IF_KUNIT(xe_tuning_process_engine);
@@ -210,7 +206,7 @@ void xe_tuning_process_lrc(struct xe_hw_engine *hwe)
xe_rtp_process_ctx_enable_active_tracking(&ctx,
hwe->gt->tuning_active.lrc,
ARRAY_SIZE(lrc_tunings));
- xe_rtp_process_to_sr(&ctx, lrc_tunings, &hwe->reg_lrc);
+ xe_rtp_process_to_sr(&ctx, lrc_tunings, ARRAY_SIZE(lrc_tunings), &hwe->reg_lrc);
}
void xe_tuning_dump(struct xe_gt *gt, struct drm_printer *p)
diff --git a/drivers/gpu/drm/xe/xe_wa.c b/drivers/gpu/drm/xe/xe_wa.c
index 55eb453f4b1fb39d4127609a28e4a5ebe9b5a051..a25afb757f7088c7f831867717b42982e9ea754c 100644
--- a/drivers/gpu/drm/xe/xe_wa.c
+++ b/drivers/gpu/drm/xe/xe_wa.c
@@ -279,8 +279,6 @@ static const struct xe_rtp_entry_sr gt_was[] = {
XE_RTP_ACTIONS(SET(VDBOX_CGCTL3F10(0), RAMDFTUNIT_CLKGATE_DIS)),
XE_RTP_ENTRY_FLAG(FOREACH_ENGINE),
},
-
- {}
};
static const struct xe_rtp_entry_sr engine_was[] = {
@@ -624,8 +622,6 @@ static const struct xe_rtp_entry_sr engine_was[] = {
FUNC(xe_rtp_match_first_render_or_compute)),
XE_RTP_ACTIONS(SET(TDL_TSL_CHICKEN, RES_CHK_SPR_DIS))
},
-
- {}
};
static const struct xe_rtp_entry_sr lrc_was[] = {
@@ -825,8 +821,6 @@ static const struct xe_rtp_entry_sr lrc_was[] = {
DIS_PARTIAL_AUTOSTRIP |
DIS_AUTOSTRIP))
},
-
- {}
};
static __maybe_unused const struct xe_rtp_entry oob_was[] = {
@@ -868,7 +862,7 @@ void xe_wa_process_gt(struct xe_gt *gt)
xe_rtp_process_ctx_enable_active_tracking(&ctx, gt->wa_active.gt,
ARRAY_SIZE(gt_was));
- xe_rtp_process_to_sr(&ctx, gt_was, >->reg_sr);
+ xe_rtp_process_to_sr(&ctx, gt_was, ARRAY_SIZE(gt_was), >->reg_sr);
}
EXPORT_SYMBOL_IF_KUNIT(xe_wa_process_gt);
@@ -886,7 +880,7 @@ void xe_wa_process_engine(struct xe_hw_engine *hwe)
xe_rtp_process_ctx_enable_active_tracking(&ctx, hwe->gt->wa_active.engine,
ARRAY_SIZE(engine_was));
- xe_rtp_process_to_sr(&ctx, engine_was, &hwe->reg_sr);
+ xe_rtp_process_to_sr(&ctx, engine_was, ARRAY_SIZE(engine_was), &hwe->reg_sr);
}
/**
@@ -903,7 +897,7 @@ void xe_wa_process_lrc(struct xe_hw_engine *hwe)
xe_rtp_process_ctx_enable_active_tracking(&ctx, hwe->gt->wa_active.lrc,
ARRAY_SIZE(lrc_was));
- xe_rtp_process_to_sr(&ctx, lrc_was, &hwe->reg_lrc);
+ xe_rtp_process_to_sr(&ctx, lrc_was, ARRAY_SIZE(lrc_was), &hwe->reg_lrc);
}
/**
---
base-commit: 6f2e5afc45e3ca8bf46427ae21a9c1029ea6cdb3
change-id: 20250306-fix-print-warning-43d20fc31309
Best regards,
--
Lucas De Marchi <lucas.demarchi at intel.com>
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