* [PATCH AUTOSEL 6.10 057/121] remoteproc: mediatek: Zero out only remaining bytes of IPI buffer
[not found] <20240801000834.3930818-1-sashal@kernel.org>
@ 2024-07-31 23:59 ` Sasha Levin
2024-07-31 23:59 ` [PATCH AUTOSEL 6.10 059/121] hwspinlock: Introduce hwspin_lock_bust() Sasha Levin
2024-07-31 23:59 ` [PATCH AUTOSEL 6.10 061/121] remoteproc: qcom_q6v5_pas: Add hwspinlock bust on stop Sasha Levin
2 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2024-07-31 23:59 UTC (permalink / raw)
To: linux-kernel, stable
Cc: AngeloGioacchino Del Regno, Mathieu Poirier, Sasha Levin,
andersson, matthias.bgg, linux-remoteproc, linux-arm-kernel,
linux-mediatek
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
[ Upstream commit 9dbd9962cfe56d210be5232349851420b5f9c8f6 ]
In scp_ipi_handler(), instead of zeroing out the entire shared
buffer, which may be as large as 600 bytes, overwrite it with the
received data, then zero out only the remaining bytes.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20240520112724.139945-1-angelogioacchino.delregno@collabora.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/remoteproc/mtk_scp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
index b8498772dba17..b885a9a041e48 100644
--- a/drivers/remoteproc/mtk_scp.c
+++ b/drivers/remoteproc/mtk_scp.c
@@ -117,8 +117,8 @@ static void scp_ipi_handler(struct mtk_scp *scp)
return;
}
- memset(scp->share_buf, 0, scp_sizes->ipi_share_buffer_size);
memcpy_fromio(scp->share_buf, &rcv_obj->share_buf, len);
+ memset(&scp->share_buf[len], 0, scp_sizes->ipi_share_buffer_size - len);
handler(scp->share_buf, len, ipi_desc[id].priv);
scp_ipi_unlock(scp, id);
--
2.43.0
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH AUTOSEL 6.10 059/121] hwspinlock: Introduce hwspin_lock_bust()
[not found] <20240801000834.3930818-1-sashal@kernel.org>
2024-07-31 23:59 ` [PATCH AUTOSEL 6.10 057/121] remoteproc: mediatek: Zero out only remaining bytes of IPI buffer Sasha Levin
@ 2024-07-31 23:59 ` Sasha Levin
2024-07-31 23:59 ` [PATCH AUTOSEL 6.10 061/121] remoteproc: qcom_q6v5_pas: Add hwspinlock bust on stop Sasha Levin
2 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2024-07-31 23:59 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Richard Maina, Bjorn Andersson, Chris Lew, Sasha Levin, peterz,
mingo, will, corbet, linux-remoteproc, linux-doc
From: Richard Maina <quic_rmaina@quicinc.com>
[ Upstream commit 7c327d56597d8de1680cf24e956b704270d3d84a ]
When a remoteproc crashes or goes down unexpectedly this can result in
a state where locks held by the remoteproc will remain locked possibly
resulting in deadlock. This new API hwspin_lock_bust() allows
hwspinlock implementers to define a bust operation for freeing previously
acquired hwspinlocks after verifying ownership of the acquired lock.
Signed-off-by: Richard Maina <quic_rmaina@quicinc.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Chris Lew <quic_clew@quicinc.com>
Link: https://lore.kernel.org/r/20240529-hwspinlock-bust-v3-1-c8b924ffa5a2@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
Documentation/locking/hwspinlock.rst | 11 ++++++++++
drivers/hwspinlock/hwspinlock_core.c | 28 ++++++++++++++++++++++++
drivers/hwspinlock/hwspinlock_internal.h | 3 +++
include/linux/hwspinlock.h | 6 +++++
4 files changed, 48 insertions(+)
diff --git a/Documentation/locking/hwspinlock.rst b/Documentation/locking/hwspinlock.rst
index 6f03713b70039..2ffaa3cbd63f1 100644
--- a/Documentation/locking/hwspinlock.rst
+++ b/Documentation/locking/hwspinlock.rst
@@ -85,6 +85,17 @@ is already free).
Should be called from a process context (might sleep).
+::
+
+ int hwspin_lock_bust(struct hwspinlock *hwlock, unsigned int id);
+
+After verifying the owner of the hwspinlock, release a previously acquired
+hwspinlock; returns 0 on success, or an appropriate error code on failure
+(e.g. -EOPNOTSUPP if the bust operation is not defined for the specific
+hwspinlock).
+
+Should be called from a process context (might sleep).
+
::
int hwspin_lock_timeout(struct hwspinlock *hwlock, unsigned int timeout);
diff --git a/drivers/hwspinlock/hwspinlock_core.c b/drivers/hwspinlock/hwspinlock_core.c
index 0c0a932c00f35..6505261e60686 100644
--- a/drivers/hwspinlock/hwspinlock_core.c
+++ b/drivers/hwspinlock/hwspinlock_core.c
@@ -305,6 +305,34 @@ void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
}
EXPORT_SYMBOL_GPL(__hwspin_unlock);
+/**
+ * hwspin_lock_bust() - bust a specific hwspinlock
+ * @hwlock: a previously-acquired hwspinlock which we want to bust
+ * @id: identifier of the remote lock holder, if applicable
+ *
+ * This function will bust a hwspinlock that was previously acquired as
+ * long as the current owner of the lock matches the id given by the caller.
+ *
+ * Context: Process context.
+ *
+ * Returns: 0 on success, or -EINVAL if the hwspinlock does not exist, or
+ * the bust operation fails, and -EOPNOTSUPP if the bust operation is not
+ * defined for the hwspinlock.
+ */
+int hwspin_lock_bust(struct hwspinlock *hwlock, unsigned int id)
+{
+ if (WARN_ON(!hwlock))
+ return -EINVAL;
+
+ if (!hwlock->bank->ops->bust) {
+ pr_err("bust operation not defined\n");
+ return -EOPNOTSUPP;
+ }
+
+ return hwlock->bank->ops->bust(hwlock, id);
+}
+EXPORT_SYMBOL_GPL(hwspin_lock_bust);
+
/**
* of_hwspin_lock_simple_xlate - translate hwlock_spec to return a lock id
* @hwlock_spec: hwlock specifier as found in the device tree
diff --git a/drivers/hwspinlock/hwspinlock_internal.h b/drivers/hwspinlock/hwspinlock_internal.h
index 29892767bb7a0..f298fc0ee5adb 100644
--- a/drivers/hwspinlock/hwspinlock_internal.h
+++ b/drivers/hwspinlock/hwspinlock_internal.h
@@ -21,6 +21,8 @@ struct hwspinlock_device;
* @trylock: make a single attempt to take the lock. returns 0 on
* failure and true on success. may _not_ sleep.
* @unlock: release the lock. always succeed. may _not_ sleep.
+ * @bust: optional, platform-specific bust handler, called by hwspinlock
+ * core to bust a specific lock.
* @relax: optional, platform-specific relax handler, called by hwspinlock
* core while spinning on a lock, between two successive
* invocations of @trylock. may _not_ sleep.
@@ -28,6 +30,7 @@ struct hwspinlock_device;
struct hwspinlock_ops {
int (*trylock)(struct hwspinlock *lock);
void (*unlock)(struct hwspinlock *lock);
+ int (*bust)(struct hwspinlock *lock, unsigned int id);
void (*relax)(struct hwspinlock *lock);
};
diff --git a/include/linux/hwspinlock.h b/include/linux/hwspinlock.h
index bfe7c1f1ac6d1..f0231dbc47771 100644
--- a/include/linux/hwspinlock.h
+++ b/include/linux/hwspinlock.h
@@ -68,6 +68,7 @@ int __hwspin_lock_timeout(struct hwspinlock *, unsigned int, int,
int __hwspin_trylock(struct hwspinlock *, int, unsigned long *);
void __hwspin_unlock(struct hwspinlock *, int, unsigned long *);
int of_hwspin_lock_get_id_byname(struct device_node *np, const char *name);
+int hwspin_lock_bust(struct hwspinlock *hwlock, unsigned int id);
int devm_hwspin_lock_free(struct device *dev, struct hwspinlock *hwlock);
struct hwspinlock *devm_hwspin_lock_request(struct device *dev);
struct hwspinlock *devm_hwspin_lock_request_specific(struct device *dev,
@@ -127,6 +128,11 @@ void __hwspin_unlock(struct hwspinlock *hwlock, int mode, unsigned long *flags)
{
}
+static inline int hwspin_lock_bust(struct hwspinlock *hwlock, unsigned int id)
+{
+ return 0;
+}
+
static inline int of_hwspin_lock_get_id(struct device_node *np, int index)
{
return 0;
--
2.43.0
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH AUTOSEL 6.10 061/121] remoteproc: qcom_q6v5_pas: Add hwspinlock bust on stop
[not found] <20240801000834.3930818-1-sashal@kernel.org>
2024-07-31 23:59 ` [PATCH AUTOSEL 6.10 057/121] remoteproc: mediatek: Zero out only remaining bytes of IPI buffer Sasha Levin
2024-07-31 23:59 ` [PATCH AUTOSEL 6.10 059/121] hwspinlock: Introduce hwspin_lock_bust() Sasha Levin
@ 2024-07-31 23:59 ` Sasha Levin
2 siblings, 0 replies; 3+ messages in thread
From: Sasha Levin @ 2024-07-31 23:59 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Richard Maina, Bjorn Andersson, Chris Lew, Sasha Levin,
mathieu.poirier, linux-arm-msm, linux-remoteproc
From: Richard Maina <quic_rmaina@quicinc.com>
[ Upstream commit 568b13b65078e2b557ccf47674a354cecd1db641 ]
When remoteproc goes down unexpectedly this results in a state where any
acquired hwspinlocks will remain locked possibly resulting in deadlock.
In order to ensure all locks are freed we include a call to
qcom_smem_bust_hwspin_lock_by_host() during remoteproc shutdown.
For qcom_q6v5_pas remoteprocs, each remoteproc has an assigned smem
host_id. Remoteproc can pass this id to smem to try and bust the lock on
remoteproc stop.
This edge case only occurs with q6v5_pas watchdog crashes. The error
fatal case has handling to clear the hwspinlock before the error fatal
interrupt is triggered.
Signed-off-by: Richard Maina <quic_rmaina@quicinc.com>
Reviewed-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Chris Lew <quic_clew@quicinc.com>
Link: https://lore.kernel.org/r/20240529-hwspinlock-bust-v3-4-c8b924ffa5a2@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/remoteproc/qcom_q6v5_pas.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
index 54d8005d40a34..8458bcfe9e19e 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -52,6 +52,7 @@ struct adsp_data {
const char *ssr_name;
const char *sysmon_name;
int ssctl_id;
+ unsigned int smem_host_id;
int region_assign_idx;
int region_assign_count;
@@ -81,6 +82,7 @@ struct qcom_adsp {
int lite_pas_id;
unsigned int minidump_id;
int crash_reason_smem;
+ unsigned int smem_host_id;
bool decrypt_shutdown;
const char *info_name;
@@ -399,6 +401,9 @@ static int adsp_stop(struct rproc *rproc)
if (handover)
qcom_pas_handover(&adsp->q6v5);
+ if (adsp->smem_host_id)
+ ret = qcom_smem_bust_hwspin_lock_by_host(adsp->smem_host_id);
+
return ret;
}
@@ -727,6 +732,7 @@ static int adsp_probe(struct platform_device *pdev)
adsp->pas_id = desc->pas_id;
adsp->lite_pas_id = desc->lite_pas_id;
adsp->info_name = desc->sysmon_name;
+ adsp->smem_host_id = desc->smem_host_id;
adsp->decrypt_shutdown = desc->decrypt_shutdown;
adsp->region_assign_idx = desc->region_assign_idx;
adsp->region_assign_count = min_t(int, MAX_ASSIGN_COUNT, desc->region_assign_count);
@@ -1196,6 +1202,7 @@ static const struct adsp_data sm8550_adsp_resource = {
.ssr_name = "lpass",
.sysmon_name = "adsp",
.ssctl_id = 0x14,
+ .smem_host_id = 2,
};
static const struct adsp_data sm8550_cdsp_resource = {
@@ -1216,6 +1223,7 @@ static const struct adsp_data sm8550_cdsp_resource = {
.ssr_name = "cdsp",
.sysmon_name = "cdsp",
.ssctl_id = 0x17,
+ .smem_host_id = 5,
};
static const struct adsp_data sm8550_mpss_resource = {
@@ -1236,6 +1244,7 @@ static const struct adsp_data sm8550_mpss_resource = {
.ssr_name = "mpss",
.sysmon_name = "modem",
.ssctl_id = 0x12,
+ .smem_host_id = 1,
.region_assign_idx = 2,
.region_assign_count = 1,
.region_assign_vmid = QCOM_SCM_VMID_MSS_MSA,
@@ -1275,6 +1284,7 @@ static const struct adsp_data sm8650_cdsp_resource = {
.ssr_name = "cdsp",
.sysmon_name = "cdsp",
.ssctl_id = 0x17,
+ .smem_host_id = 5,
.region_assign_idx = 2,
.region_assign_count = 1,
.region_assign_shared = true,
@@ -1299,6 +1309,7 @@ static const struct adsp_data sm8650_mpss_resource = {
.ssr_name = "mpss",
.sysmon_name = "modem",
.ssctl_id = 0x12,
+ .smem_host_id = 1,
.region_assign_idx = 2,
.region_assign_count = 3,
.region_assign_vmid = QCOM_SCM_VMID_MSS_MSA,
--
2.43.0
^ permalink raw reply related [flat|nested] 3+ messages in thread