Re: [igt-dev] [PATCH i-g-t 05/14] tools/intel_display_poller: Add flipdone tests

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Mon, Mar 01, 2021 at 03:54:25PM -0800, Navare, Manasi wrote:
> On Mon, Mar 01, 2021 at 12:37:38PM -0800, Manasi Navare wrote:
> > From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> > 
> > Add test for determining on which scanline the flipdone interrupt
> > is signalled. ilk+ and vlv/chv have this. Earlier platforms had
> > a "flip pending" bit instead which only seems to respond to CS flips
> > so not relevant for MMIO based flips.
> > 
> > v2: Rework the loops a bit to ease VRR in the future
> > 
> > Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> Looks good to me in general for checking the flipdone interrupt.
> So for the changes here:
> 
> Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
> 
> Quick question here:
> How do we test this TEST_FLIPDONE with vrr enabled, we need to add setting vrr prop etc here?

Just enable vrr whatever way you feel like it. I did it by forcing it on
always in the kernel. But I guess we could add a knob to eg. testdisplay
to turn it on. Then you could easily test any mode you want with or
without vrr.

> 
> Manasi
> 
> > ---
> >  tools/intel_display_poller.c | 187 ++++++++++++++++++++++++++++++++++-
> >  1 file changed, 186 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/intel_display_poller.c b/tools/intel_display_poller.c
> > index 826833b3..be237221 100644
> > --- a/tools/intel_display_poller.c
> > +++ b/tools/intel_display_poller.c
> > @@ -52,6 +52,9 @@ enum test {
> >  	TEST_FLIPCOUNT,
> >  	TEST_PAN,
> >  	TEST_FLIP,
> > +	TEST_FLIPDONE,
> > +	TEST_FLIPDONE_PIPESTAT,
> > +	TEST_FLIPDONE_DEIIR,
> >  	TEST_SURFLIVE,
> >  	TEST_WRAP,
> >  	TEST_FIELD,
> > @@ -789,6 +792,158 @@ static void poll_dsl_flip(uint32_t devid, int pipe, int target_scanline, int tar
> >  	write_reg(surf, saved);
> >  }
> >  
> > +static void poll_dsl_flipdone_pipestat(uint32_t devid, int pipe, int target_scanline, int target_fuzz,
> > +				       uint32_t *min, uint32_t *max, const int count)
> > +{
> > +	uint32_t dsl, dsl1 = 0, dsl2 = 0;
> > +	uint32_t pipestat, pipestat1, pipestat2, pipestat_save;
> > +	bool field1 = false, field2 = false;
> > +	uint32_t saved, next, surf = 0, bit;
> > +	int i[2] = {};
> > +
> > +	dsl = PIPE_REG(pipe, PIPEA_DSL);
> > +	pipestat = PIPE_REG(pipe, PIPEASTAT);
> > +	surf = dspsurf_reg(devid, pipe);
> > +
> > +	bit = 1 << 10;
> > +
> > +	saved = read_reg(surf);
> > +	next = saved;
> > +
> > +	pipestat_save = read_reg(pipestat) & 0x7fff0000;
> > +	pipestat1 = pipestat_save & ~(1 << (bit<<16));
> > +	write_reg(pipestat, pipestat1 | bit);
> > +
> > +	while (!quit) {
> > +		while (!quit) {
> > +			dsl1 = read_reg(dsl);
> > +			field1 = dsl1 & 0x80000000;
> > +			dsl1 &= ~0x80000000;
> > +			if (dsl1 == target_scanline)
> > +				break;
> > +		}
> > +
> > +		write_reg(pipestat, pipestat1 | bit);
> > +		if (next == saved)
> > +			next = saved+256*1024;
> > +		else
> > +			next = saved;
> > +		write_reg(surf, next);
> > +
> > +		while (!quit) {
> > +			pipestat2 = read_reg(pipestat);
> > +			dsl2 = read_reg(dsl);
> > +
> > +			field2 = dsl2 & 0x80000000;
> > +			dsl2 &= ~0x80000000;
> > +
> > +			if (pipestat2 & bit)
> > +				break;
> > +		}
> > +
> > +		write_reg(pipestat, pipestat1 | bit);
> > +
> > +		if (field1 != field2)
> > +			printf("fields are different (%u:%u -> %u:%u)\n",
> > +			       field1, dsl1, field2, dsl2);
> > +
> > +		min[field1*count+i[field1]] = dsl1;
> > +		max[field1*count+i[field1]] = dsl2;
> > +		if (++i[field1] >= count)
> > +			break;
> > +	}
> > +
> > +	write_reg(surf, saved);
> > +	write_reg(pipestat, pipestat_save);
> > +}
> > +
> > +static void poll_dsl_flipdone_deiir(uint32_t devid, int pipe, int target_scanline, int target_fuzz,
> > +				    uint32_t *min, uint32_t *max, const int count)
> > +{
> > +	uint32_t dsl, dsl1 = 0, dsl2 = 0;
> > +	uint32_t iir, iir2, ier, imr;
> > +	uint32_t ier_save, imr_save;
> > +	bool field1 = false, field2 = false;
> > +	uint32_t saved, next, surf = 0, bit;
> > +	int i[2] = {};
> > +
> > +	dsl = PIPE_REG(pipe, PIPEA_DSL);
> > +	surf = dspsurf_reg(devid, pipe);
> > +
> > +	if (intel_gen(devid) >= 9)
> > +		bit = 3;
> > +	else if (intel_gen(devid) >= 8)
> > +		bit = 4;
> > +	else if (intel_gen(devid) >= 7)
> > +		bit = 3 + 5 * pipe;
> > +	else if (intel_gen(devid) >= 5)
> > +		bit = 26 + pipe;
> > +	else
> > +		abort();
> > +	bit = 1 << bit;
> > +
> > +	if (intel_gen(devid) >= 8) {
> > +		iir = GEN8_DE_PIPE_IIR(pipe);
> > +		ier = GEN8_DE_PIPE_IER(pipe);
> > +		imr = GEN8_DE_PIPE_IMR(pipe);
> > +	} else {
> > +		iir = DEIIR;
> > +		ier = DEIER;
> > +		imr = DEIMR;
> > +	}
> > +
> > +	saved = read_reg(surf);
> > +	next = saved;
> > +
> > +	imr_save = read_reg(imr);
> > +	ier_save = read_reg(ier);
> > +	write_reg(ier, ier_save & ~bit);
> > +	write_reg(imr, imr_save & ~bit);
> > +
> > +	while (!quit) {
> > +		while (!quit) {
> > +			dsl1 = read_reg(dsl);
> > +			field1 = dsl1 & 0x80000000;
> > +			dsl1 &= ~0x80000000;
> > +			if (dsl1 == target_scanline)
> > +				break;
> > +		}
> > +
> > +		write_reg(iir, bit);
> > +		if (next == saved)
> > +			next = saved+256*1024;
> > +		else
> > +			next = saved;
> > +		write_reg(surf, next);
> > +
> > +		while (!quit) {
> > +			iir2 = read_reg(iir);
> > +			dsl2 = read_reg(dsl);
> > +
> > +			field2 = dsl2 & 0x80000000;
> > +			dsl2 &= ~0x80000000;
> > +
> > +			if (iir2 & bit)
> > +				break;
> > +		}
> > +
> > +		write_reg(iir, bit);
> > +
> > +		if (field1 != field2)
> > +			printf("fields are different (%u:%u -> %u:%u)\n",
> > +			       field1, dsl1, field2, dsl2);
> > +
> > +		min[field1*count+i[field1]] = dsl1;
> > +		max[field1*count+i[field1]] = dsl2;
> > +		if (++i[field1] >= count)
> > +			break;
> > +	}
> > +
> > +	write_reg(surf, saved);
> > +	write_reg(imr, imr_save);
> > +	write_reg(ier, ier_save);
> > +}
> > +
> >  static void poll_dsl_surflive(uint32_t devid, int pipe,
> >  			      uint32_t *min, uint32_t *max, const int count)
> >  {
> > @@ -933,6 +1088,12 @@ static const char *test_name(enum test test, int pipe, int bit, bool test_pixel_
> >  	case TEST_FLIP:
> >  		snprintf(str, sizeof str, "%s / pipe %c / Flip", type, pipe_name(pipe));
> >  		return str;
> > +	case TEST_FLIPDONE_PIPESTAT:
> > +		snprintf(str, sizeof str, "%s / pipe %c / Flip done (vlv/chv)", type, pipe_name(pipe));
> > +		return str;
> > +	case TEST_FLIPDONE_DEIIR:
> > +		snprintf(str, sizeof str, "%s / pipe %c / Flip done (pch)", type, pipe_name(pipe));
> > +		return str;
> >  	case TEST_SURFLIVE:
> >  		snprintf(str, sizeof str, "%s / pipe %c / Surflive", type, pipe_name(pipe));
> >  		return str;
> > @@ -950,7 +1111,7 @@ static const char *test_name(enum test test, int pipe, int bit, bool test_pixel_
> >  static void __attribute__((noreturn)) usage(const char *name)
> >  {
> >  	fprintf(stderr, "Usage: %s [options]\n"
> > -		" -t,--test <pipestat|iir|framecount|flipcount|pan|flip|surflive|wrap|field>\n"
> > +		" -t,--test <pipestat|iir|framecount|flipcount|pan|flip|flipdone|surflive|wrap|field>\n"
> >  		" -p,--pipe <pipe>\n"
> >  		" -b,--bit <bit>\n"
> >  		" -l,--line <target scanline/pixel>\n"
> > @@ -1002,6 +1163,8 @@ int main(int argc, char *argv[])
> >  				test = TEST_PAN;
> >  			else if (!strcmp(optarg, "flip"))
> >  				test = TEST_FLIP;
> > +			else if (!strcmp(optarg, "flipdone"))
> > +				test = TEST_FLIPDONE;
> >  			else if (!strcmp(optarg, "surflive"))
> >  				test = TEST_SURFLIVE;
> >  			else if (!strcmp(optarg, "wrap"))
> > @@ -1117,6 +1280,16 @@ int main(int argc, char *argv[])
> >  		case TEST_FRAMECOUNT:
> >  			test = TEST_FRAMECOUNT_G4X;
> >  			break;
> > +		case TEST_FLIPDONE:
> > +			/*
> > +			 * g4x has no apparent "flip done" interrupt,
> > +			 * and the "flip pending" interrupt does not
> > +			 * seem to do anything with mmio flips.
> > +			 */
> > +			if (IS_G4X(devid))
> > +				usage(argv[0]);
> > +			test = TEST_FLIPDONE_PIPESTAT;
> > +			break;
> >  		case TEST_FLIPCOUNT:
> >  		case TEST_PIPESTAT:
> >  		case TEST_PAN:
> > @@ -1146,6 +1319,9 @@ int main(int argc, char *argv[])
> >  		case TEST_FRAMECOUNT:
> >  			test = TEST_FRAMECOUNT_G4X;
> >  			break;
> > +		case TEST_FLIPDONE:
> > +			test = TEST_FLIPDONE_DEIIR;
> > +			break;
> >  		case TEST_FLIPCOUNT:
> >  		case TEST_PAN:
> >  		case TEST_FLIP:
> > @@ -1161,6 +1337,7 @@ int main(int argc, char *argv[])
> >  	switch (test) {
> >  	case TEST_IIR:
> >  	case TEST_FRAMECOUNT:
> > +	case TEST_FLIPDONE:
> >  		/* should no longer have the generic tests here */
> >  		assert(0);
> >  	default:
> > @@ -1226,6 +1403,14 @@ int main(int argc, char *argv[])
> >  			poll_dsl_flip(devid, pipe, target_scanline, target_fuzz,
> >  				      min, max, count);
> >  		break;
> > +	case TEST_FLIPDONE_PIPESTAT:
> > +		poll_dsl_flipdone_pipestat(devid, pipe, target_scanline, target_fuzz,
> > +					   min, max, count);
> > +		break;
> > +	case TEST_FLIPDONE_DEIIR:
> > +		poll_dsl_flipdone_deiir(devid, pipe, target_scanline, target_fuzz,
> > +					min, max, count);
> > +		break;
> >  	case TEST_SURFLIVE:
> >  		poll_dsl_surflive(devid, pipe, min, max, count);
> >  		break;
> > -- 
> > 2.19.1
> > 
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-- 
Ville Syrjälä
Intel
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