* [bug report] drm/msm/a6xx: Fix llcc configuration for a660 gpu
@ 2021-10-12 10:00 Dan Carpenter
2021-10-14 6:21 ` Akhil P Oommen
0 siblings, 1 reply; 2+ messages in thread
From: Dan Carpenter @ 2021-10-12 10:00 UTC (permalink / raw)
To: akhilpo; +Cc: linux-arm-msm, freedreno
Hello Akhil P Oommen,
The patch a6f24383f6c0: "drm/msm/a6xx: Fix llcc configuration for
a660 gpu" from Jul 30, 2021, leads to the following Smatch static
checker warning:
drivers/gpu/drm/msm/adreno/a6xx_gpu.c:1480 a6xx_llc_activate()
error: uninitialized symbol 'gpu_scid'.
drivers/gpu/drm/msm/adreno/a6xx_gpu.c
1423 static void a6xx_llc_activate(struct a6xx_gpu *a6xx_gpu)
1424 {
1425 struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
1426 struct msm_gpu *gpu = &adreno_gpu->base;
1427 u32 gpu_scid, cntl1_regval = 0;
1428
1429 if (IS_ERR(a6xx_gpu->llc_mmio))
1430 return;
1431
1432 if (!llcc_slice_activate(a6xx_gpu->llc_slice)) {
1433 gpu_scid = llcc_get_slice_id(a6xx_gpu->llc_slice);
1434
1435 gpu_scid &= 0x1f;
1436 cntl1_regval = (gpu_scid << 0) | (gpu_scid << 5) | (gpu_scid << 10) |
1437 (gpu_scid << 15) | (gpu_scid << 20);
1438 }
gpu_scid not initialized on the else path.
1439
1440 /*
1441 * For targets with a MMU500, activate the slice but don't program the
1442 * register. The XBL will take care of that.
1443 */
1444 if (!llcc_slice_activate(a6xx_gpu->htw_llc_slice)) {
1445 if (!a6xx_gpu->have_mmu500) {
1446 u32 gpuhtw_scid = llcc_get_slice_id(a6xx_gpu->htw_llc_slice);
1447
1448 gpuhtw_scid &= 0x1f;
1449 cntl1_regval |= FIELD_PREP(GENMASK(29, 25), gpuhtw_scid);
1450 }
1451 }
1452
1453 if (!cntl1_regval)
1454 return;
1455
1456 /*
1457 * Program the slice IDs for the various GPU blocks and GPU MMU
1458 * pagetables
1459 */
1460 if (!a6xx_gpu->have_mmu500) {
1461 a6xx_llc_write(a6xx_gpu,
1462 REG_A6XX_CX_MISC_SYSTEM_CACHE_CNTL_1, cntl1_regval);
1463
1464 /*
1465 * Program cacheability overrides to not allocate cache
1466 * lines on a write miss
1467 */
1468 a6xx_llc_rmw(a6xx_gpu,
1469 REG_A6XX_CX_MISC_SYSTEM_CACHE_CNTL_0, 0xF, 0x03);
1470 return;
1471 }
1472
1473 gpu_rmw(gpu, REG_A6XX_GBIF_SCACHE_CNTL1, GENMASK(24, 0), cntl1_regval);
1474
1475 /* On A660, the SCID programming for UCHE traffic is done in
1476 * A6XX_GBIF_SCACHE_CNTL0[14:10]
1477 */
1478 if (adreno_is_a660_family(adreno_gpu))
1479 gpu_rmw(gpu, REG_A6XX_GBIF_SCACHE_CNTL0, (0x1f << 10) |
--> 1480 (1 << 8), (gpu_scid << 10) | (1 << 8));
^^^^^^^^^^^^^^
Used here.
1481 }
regards,
dan carpenter
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [bug report] drm/msm/a6xx: Fix llcc configuration for a660 gpu
2021-10-12 10:00 [bug report] drm/msm/a6xx: Fix llcc configuration for a660 gpu Dan Carpenter
@ 2021-10-14 6:21 ` Akhil P Oommen
0 siblings, 0 replies; 2+ messages in thread
From: Akhil P Oommen @ 2021-10-14 6:21 UTC (permalink / raw)
To: Dan Carpenter; +Cc: linux-arm-msm, freedreno
On 10/12/2021 3:30 PM, Dan Carpenter wrote:
> Hello Akhil P Oommen,
>
> The patch a6f24383f6c0: "drm/msm/a6xx: Fix llcc configuration for
> a660 gpu" from Jul 30, 2021, leads to the following Smatch static
> checker warning:
>
> drivers/gpu/drm/msm/adreno/a6xx_gpu.c:1480 a6xx_llc_activate()
> error: uninitialized symbol 'gpu_scid'.
>
> drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> 1423 static void a6xx_llc_activate(struct a6xx_gpu *a6xx_gpu)
> 1424 {
> 1425 struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
> 1426 struct msm_gpu *gpu = &adreno_gpu->base;
> 1427 u32 gpu_scid, cntl1_regval = 0;
> 1428
> 1429 if (IS_ERR(a6xx_gpu->llc_mmio))
> 1430 return;
> 1431
> 1432 if (!llcc_slice_activate(a6xx_gpu->llc_slice)) {
> 1433 gpu_scid = llcc_get_slice_id(a6xx_gpu->llc_slice);
> 1434
> 1435 gpu_scid &= 0x1f;
> 1436 cntl1_regval = (gpu_scid << 0) | (gpu_scid << 5) | (gpu_scid << 10) |
> 1437 (gpu_scid << 15) | (gpu_scid << 20);
> 1438 }
>
> gpu_scid not initialized on the else path.
>
> 1439
> 1440 /*
> 1441 * For targets with a MMU500, activate the slice but don't program the
> 1442 * register. The XBL will take care of that.
> 1443 */
> 1444 if (!llcc_slice_activate(a6xx_gpu->htw_llc_slice)) {
> 1445 if (!a6xx_gpu->have_mmu500) {
> 1446 u32 gpuhtw_scid = llcc_get_slice_id(a6xx_gpu->htw_llc_slice);
> 1447
> 1448 gpuhtw_scid &= 0x1f;
> 1449 cntl1_regval |= FIELD_PREP(GENMASK(29, 25), gpuhtw_scid);
> 1450 }
> 1451 }
> 1452
> 1453 if (!cntl1_regval)
> 1454 return;
> 1455
> 1456 /*
> 1457 * Program the slice IDs for the various GPU blocks and GPU MMU
> 1458 * pagetables
> 1459 */
> 1460 if (!a6xx_gpu->have_mmu500) {
> 1461 a6xx_llc_write(a6xx_gpu,
> 1462 REG_A6XX_CX_MISC_SYSTEM_CACHE_CNTL_1, cntl1_regval);
> 1463
> 1464 /*
> 1465 * Program cacheability overrides to not allocate cache
> 1466 * lines on a write miss
> 1467 */
> 1468 a6xx_llc_rmw(a6xx_gpu,
> 1469 REG_A6XX_CX_MISC_SYSTEM_CACHE_CNTL_0, 0xF, 0x03);
> 1470 return;
> 1471 }
> 1472
> 1473 gpu_rmw(gpu, REG_A6XX_GBIF_SCACHE_CNTL1, GENMASK(24, 0), cntl1_regval);
> 1474
> 1475 /* On A660, the SCID programming for UCHE traffic is done in
> 1476 * A6XX_GBIF_SCACHE_CNTL0[14:10]
> 1477 */
> 1478 if (adreno_is_a660_family(adreno_gpu))
> 1479 gpu_rmw(gpu, REG_A6XX_GBIF_SCACHE_CNTL0, (0x1f << 10) |
> --> 1480 (1 << 8), (gpu_scid << 10) | (1 << 8));
> ^^^^^^^^^^^^^^
> Used here.
>
> 1481 }
>
> regards,
> dan carpenter
>
Thanks, Dan. I will fix this in the stack I share.
-Akhil.
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