[PATCH AUTOSEL 6.6 063/139] ASoC: codecs: wsa883x: Handle reading version failure

[PATCH AUTOSEL 6.6 063/139] ASoC: codecs: wsa883x: Handle reading version failure

[Sasha Levin]

From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

[ Upstream commit 2fbf16992e5aa14acf0441320033a01a32309ded ]

If reading version and variant from registers fails (which is unlikely
but possible, because it is a read over bus), the driver will proceed
and perform device configuration based on uninitialized stack variables.
Handle it a bit better - bail out without doing any init and failing the
update status Soundwire callback.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20240710-asoc-wsa88xx-version-v1-2-f1c54966ccde@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/codecs/wsa883x.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/sound/soc/codecs/wsa883x.c b/sound/soc/codecs/wsa883x.c
index 2169d93989841..1831d4487ba9d 100644
--- a/sound/soc/codecs/wsa883x.c
+++ b/sound/soc/codecs/wsa883x.c
@@ -998,15 +998,19 @@ static const struct reg_sequence reg_init[] = {
 	{WSA883X_GMAMP_SUP1, 0xE2},
 };
 
-static void wsa883x_init(struct wsa883x_priv *wsa883x)
+static int wsa883x_init(struct wsa883x_priv *wsa883x)
 {
 	struct regmap *regmap = wsa883x->regmap;
-	int variant, version;
+	int variant, version, ret;
 
-	regmap_read(regmap, WSA883X_OTP_REG_0, &variant);
+	ret = regmap_read(regmap, WSA883X_OTP_REG_0, &variant);
+	if (ret)
+		return ret;
 	wsa883x->variant = variant & WSA883X_ID_MASK;
 
-	regmap_read(regmap, WSA883X_CHIP_ID0, &version);
+	ret = regmap_read(regmap, WSA883X_CHIP_ID0, &version);
+	if (ret)
+		return ret;
 	wsa883x->version = version;
 
 	switch (wsa883x->variant) {
@@ -1041,6 +1045,8 @@ static void wsa883x_init(struct wsa883x_priv *wsa883x)
 				   WSA883X_DRE_OFFSET_MASK,
 				   wsa883x->comp_offset);
 	}
+
+	return 0;
 }
 
 static int wsa883x_update_status(struct sdw_slave *slave,
@@ -1049,7 +1055,7 @@ static int wsa883x_update_status(struct sdw_slave *slave,
 	struct wsa883x_priv *wsa883x = dev_get_drvdata(&slave->dev);
 
 	if (status == SDW_SLAVE_ATTACHED && slave->dev_num > 0)
-		wsa883x_init(wsa883x);
+		return wsa883x_init(wsa883x);
 
 	return 0;
 }
-- 
2.43.0

[PATCH AUTOSEL 6.6 078/139] iommu/arm-smmu-qcom: hide last LPASS SMMU context bank from linux

[Sasha Levin]

From: Marc Gonzalez <mgonzalez@freebox.fr>

[ Upstream commit 3a8990b8a778219327c5f8ecf10b5d81377b925a ]

On qcom msm8998, writing to the last context bank of lpass_q6_smmu
(base address 0x05100000) produces a system freeze & reboot.

The hardware/hypervisor reports 13 context banks for the LPASS SMMU
on msm8998, but only the first 12 are accessible...
Override the number of context banks

[    2.546101] arm-smmu 5100000.iommu: probing hardware configuration...
[    2.552439] arm-smmu 5100000.iommu: SMMUv2 with:
[    2.558945] arm-smmu 5100000.iommu: 	stage 1 translation
[    2.563627] arm-smmu 5100000.iommu: 	address translation ops
[    2.568923] arm-smmu 5100000.iommu: 	non-coherent table walk
[    2.574566] arm-smmu 5100000.iommu: 	(IDR0.CTTW overridden by FW configuration)
[    2.580220] arm-smmu 5100000.iommu: 	stream matching with 12 register groups
[    2.587263] arm-smmu 5100000.iommu: 	13 context banks (0 stage-2 only)
[    2.614447] arm-smmu 5100000.iommu: 	Supported page sizes: 0x63315000
[    2.621358] arm-smmu 5100000.iommu: 	Stage-1: 36-bit VA -> 36-bit IPA
[    2.627772] arm-smmu 5100000.iommu: 	preserved 0 boot mappings

Specifically, the crashes occur here:

	qsmmu->bypass_cbndx = smmu->num_context_banks - 1;
	arm_smmu_cb_write(smmu, qsmmu->bypass_cbndx, ARM_SMMU_CB_SCTLR, 0);

and here:

	arm_smmu_write_context_bank(smmu, i);
	arm_smmu_cb_write(smmu, i, ARM_SMMU_CB_FSR, ARM_SMMU_CB_FSR_FAULT);

It is likely that FW reserves the last context bank for its own use,
thus a simple work-around is: DON'T USE IT in Linux.

If we decrease the number of context banks, last one will be "hidden".

Signed-off-by: Marc Gonzalez <mgonzalez@freebox.fr>
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20240820-smmu-v3-1-2f71483b00ec@freebox.fr
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index 6e6cb19c81f59..b899a7b7fa935 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -278,6 +278,13 @@ static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu)
 	u32 smr;
 	int i;
 
+	/*
+	 * MSM8998 LPASS SMMU reports 13 context banks, but accessing
+	 * the last context bank crashes the system.
+	 */
+	if (of_device_is_compatible(smmu->dev->of_node, "qcom,msm8998-smmu-v2") && smmu->num_context_banks == 13)
+		smmu->num_context_banks = 12;
+
 	/*
 	 * Some platforms support more than the Arm SMMU architected maximum of
 	 * 128 stream matching groups. For unknown reasons, the additional
-- 
2.43.0

[PATCH AUTOSEL 6.6 079/139] iommu/arm-smmu-qcom: Work around SDM845 Adreno SMMU w/ 16K pages

[Sasha Levin]

From: Konrad Dybcio <konrad.dybcio@linaro.org>

[ Upstream commit 2d42d3ba443706c9164fa0bef4e5fd1c36bc1bd9 ]

SDM845's Adreno SMMU is unique in that it actually advertizes support
for 16K (and 32M) pages, which doesn't hold for newer SoCs.

This however, seems either broken in the hardware implementation, the
hypervisor middleware that abstracts the SMMU, or there's a bug in the
Linux kernel somewhere down the line that nobody managed to track down.

Booting SDM845 with 16K page sizes and drm/msm results in:

*** gpu fault: ttbr0=0000000000000000 iova=000100000000c000 dir=READ
type=TRANSLATION source=CP (0,0,0,0)

right after loading the firmware. The GPU then starts spitting out
illegal intstruction errors, as it's quite obvious that it got a
bogus pointer.

Moreover, it seems like this issue also concerns other implementations
of SMMUv2 on Qualcomm SoCs, such as the one on SC7180.

Hide 16K support on such instances to work around this.

Reported-by: Sumit Semwal <sumit.semwal@linaro.org>
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240824-topic-845_gpu_smmu-v2-1-a302b8acc052@quicinc.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
index b899a7b7fa935..db2092d5af5eb 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
@@ -341,6 +341,14 @@ static int qcom_smmu_cfg_probe(struct arm_smmu_device *smmu)
 	return 0;
 }
 
+static int qcom_adreno_smmuv2_cfg_probe(struct arm_smmu_device *smmu)
+{
+	/* Support for 16K pages is advertised on some SoCs, but it doesn't seem to work */
+	smmu->features &= ~ARM_SMMU_FEAT_FMT_AARCH64_16K;
+
+	return 0;
+}
+
 static void qcom_smmu_write_s2cr(struct arm_smmu_device *smmu, int idx)
 {
 	struct arm_smmu_s2cr *s2cr = smmu->s2crs + idx;
@@ -431,6 +439,7 @@ static const struct arm_smmu_impl sdm845_smmu_500_impl = {
 
 static const struct arm_smmu_impl qcom_adreno_smmu_v2_impl = {
 	.init_context = qcom_adreno_smmu_init_context,
+	.cfg_probe = qcom_adreno_smmuv2_cfg_probe,
 	.def_domain_type = qcom_smmu_def_domain_type,
 	.alloc_context_bank = qcom_adreno_smmu_alloc_context_bank,
 	.write_sctlr = qcom_adreno_smmu_write_sctlr,
-- 
2.43.0

[PATCH AUTOSEL 6.6 099/139] drm/msm/adreno: Assign msm_gpu->pdev earlier to avoid nullptrs

[Sasha Levin]

From: Konrad Dybcio <konrad.dybcio@linaro.org>

[ Upstream commit 16007768551d5bfe53426645401435ca8d2ef54f ]

There are some cases, such as the one uncovered by Commit 46d4efcccc68
("drm/msm/a6xx: Avoid a nullptr dereference when speedbin setting fails")
where

msm_gpu_cleanup() : platform_set_drvdata(gpu->pdev, NULL);

is called on gpu->pdev == NULL, as the GPU device has not been fully
initialized yet.

Turns out that there's more than just the aforementioned path that
causes this to happen (e.g. the case when there's speedbin data in the
catalog, but opp-supported-hw is missing in DT).

Assigning msm_gpu->pdev earlier seems like the least painful solution
to this, therefore do so.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/602742/
Signed-off-by: Rob Clark <robdclark@chromium.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 1 +
 drivers/gpu/drm/msm/msm_gpu.c           | 1 -
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 8090dde032808..00419e0693419 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -1071,6 +1071,7 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	adreno_gpu->chip_id = config->chip_id;
 
 	gpu->allow_relocs = config->info->family < ADRENO_6XX_GEN1;
+	gpu->pdev = pdev;
 
 	/* Only handle the core clock when GMU is not in use (or is absent). */
 	if (adreno_has_gmu_wrapper(adreno_gpu) ||
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 5c10b559a5957..5a7541597d0ce 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -927,7 +927,6 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	if (IS_ERR(gpu->gpu_cx))
 		gpu->gpu_cx = NULL;
 
-	gpu->pdev = pdev;
 	platform_set_drvdata(pdev, &gpu->adreno_smmu);
 
 	msm_devfreq_init(gpu);
-- 
2.43.0