[igt-dev] [PATCH i-g-t] tools/intel_watermark: Parse WM_DBG to help diagnose watermark issues
Ville Syrjala
ville.syrjala at linux.intel.com
Wed Mar 27 16:03:29 UTC 2019
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
WM_DBG has some useful sticky bits which tell us whether the
hardware has entered specific LP1+ and/or maxfifo modes since
those bits were last cleared. Let's dump those out.
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
tools/intel_watermark.c | 33 +++++++++++++++++++++++++++++++++
1 file changed, 33 insertions(+)
diff --git a/tools/intel_watermark.c b/tools/intel_watermark.c
index 2dc4307c33a3..8296795f5b66 100644
--- a/tools/intel_watermark.c
+++ b/tools/intel_watermark.c
@@ -43,6 +43,11 @@ static uint32_t read_reg(uint32_t addr)
return INREG(display_base + addr);
}
+static void write_reg(uint32_t addr, uint32_t val)
+{
+ OUTREG(display_base + addr, val);
+}
+
struct gmch_wm {
int wm, wm1, dl, fifo, fbc, burst;
bool dl_prec, valid;
@@ -250,6 +255,7 @@ static void skl_wm_dump(void)
uint32_t nv12_buf_cfg[num_pipes][max_planes];
uint32_t plane_ctl[num_pipes][max_planes];
uint32_t wm_linetime[num_pipes];
+ uint32_t wm_dbg;
intel_register_access_init(igt_device_get_pci_device(fd), 0, -1);
@@ -456,6 +462,17 @@ static void skl_wm_dump(void)
printf("* plane watermark enabled\n");
printf("(x) line watermark if enabled\n");
+
+ wm_dbg = read_reg(0x45280);
+ printf("WM_DBG: 0x%08x\n", wm_dbg);
+ printf(" LP used:");
+ for (level = 1; level < num_levels; level++) {
+ if (wm_dbg & (1 << (23 + level)))
+ printf(" LP%d", level);
+ }
+ printf("\n");
+ /* clear the sticky bits */
+ write_reg(0x45280, wm_dbg);
}
static void ilk_wm_dump(void)
@@ -608,6 +625,22 @@ static void ilk_wm_dump(void)
}
printf("FBC watermark = %s\n",
endis(!REG_DECODE1(arb_ctl, 15, 1)));
+
+ if (IS_BROADWELL(devid) || IS_HASWELL(devid)) {
+ uint32_t wm_dbg = read_reg(0x45280);
+ printf("WM_DBG: 0x%08x\n", wm_dbg);
+ if (wm_dbg & (1 << 31))
+ printf(" Full maxfifo used\n");
+ if (wm_dbg & (1 << 30))
+ printf(" Sprite maxfifo used\n");
+ printf(" LP used:");
+ for (i = 1; i < 4; i++) {
+ if (wm_dbg & (1 << (23+i)))
+ printf(" LP%d", i);
+ }
+ /* clear the sticky bits */
+ write_reg(0x45280, wm_dbg);
+ }
}
static void vlv_wm_dump(void)
--
2.19.2
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