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soc: qcom: smem: Add qcom_smem_bust_hwspin_lock_by_host()

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[ Upstream commit 2e3f0d6938 ]

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>
This commit is contained in:
Chris Lew 2024-05-29 11:09:57 -07:00 committed by Greg Kroah-Hartman
parent a6978d1b7b
commit 220725de5a
2 changed files with 28 additions and 0 deletions
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26
drivers/soc/qcom/smem.c
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@ -359,6 +359,32 @@ static struct qcom_smem *__smem;
/* Timeout (ms) for the trylock of remote spinlocks */ /* Timeout (ms) for the trylock of remote spinlocks */
#define HWSPINLOCK_TIMEOUT 1000 #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 * qcom_smem_is_available() - Check if SMEM is available
* *

2
include/linux/soc/qcom/smem.h
View File

@ -14,4 +14,6 @@ phys_addr_t qcom_smem_virt_to_phys(void *p);
int qcom_smem_get_soc_id(u32 *id); int qcom_smem_get_soc_id(u32 *id);
int qcom_smem_bust_hwspin_lock_by_host(unsigned int host);
#endif #endif