diff options
| author | Chris Lew <quic_clew@quicinc.com> | 2024-05-29 21:09:57 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-09-08 08:54:43 +0300 |
| commit | 220725de5aa57a48ab32972ce577fa086c7273b1 (patch) | |
| tree | 429f0f5d92854059d45df5d9ceedc05624c3cfa1 /drivers/soc/qcom | |
| parent | a6978d1b7bb8f3a25305e8ff7d367f7289614c5d (diff) | |
| download | linux-220725de5aa57a48ab32972ce577fa086c7273b1.tar.xz | |
soc: qcom: smem: Add qcom_smem_bust_hwspin_lock_by_host()
[ Upstream commit 2e3f0d693875db698891ffe89a18121bda5b95b8 ]
Add qcom_smem_bust_hwspin_lock_by_host to enable remoteproc to bust the
hwspin_lock owned by smem. In the event the remoteproc crashes
unexpectedly, the remoteproc driver can invoke this API to try and bust
the hwspin_lock and release the lock if still held by the remoteproc
device.
Signed-off-by: Chris Lew <quic_clew@quicinc.com>
Reviewed-by: Bjorn Andersson <quic_bjorande@quicinc.com>
Link: https://lore.kernel.org/r/20240529-hwspinlock-bust-v3-3-c8b924ffa5a2@quicinc.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/soc/qcom')
| -rw-r--r-- | drivers/soc/qcom/smem.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c index d4a89d2bb43b..2e8568d6cde9 100644 --- a/drivers/soc/qcom/smem.c +++ b/drivers/soc/qcom/smem.c @@ -359,6 +359,32 @@ static struct qcom_smem *__smem; /* Timeout (ms) for the trylock of remote spinlocks */ #define HWSPINLOCK_TIMEOUT 1000 +/* The qcom hwspinlock id is always plus one from the smem host id */ +#define SMEM_HOST_ID_TO_HWSPINLOCK_ID(__x) ((__x) + 1) + +/** + * qcom_smem_bust_hwspin_lock_by_host() - bust the smem hwspinlock for a host + * @host: remote processor id + * + * Busts the hwspin_lock for the given smem host id. This helper is intended + * for remoteproc drivers that manage remoteprocs with an equivalent smem + * driver instance in the remote firmware. Drivers can force a release of the + * smem hwspin_lock if the rproc unexpectedly goes into a bad state. + * + * Context: Process context. + * + * Returns: 0 on success, otherwise negative errno. + */ +int qcom_smem_bust_hwspin_lock_by_host(unsigned int host) +{ + /* This function is for remote procs, so ignore SMEM_HOST_APPS */ + if (host == SMEM_HOST_APPS || host >= SMEM_HOST_COUNT) + return -EINVAL; + + return hwspin_lock_bust(__smem->hwlock, SMEM_HOST_ID_TO_HWSPINLOCK_ID(host)); +} +EXPORT_SYMBOL_GPL(qcom_smem_bust_hwspin_lock_by_host); + /** * qcom_smem_is_available() - Check if SMEM is available * |