Commit 2e3f0d69 authored by Chris Lew's avatar Chris Lew Committed by Bjorn Andersson
Browse files

soc: qcom: smem: Add qcom_smem_bust_hwspin_lock_by_host() 



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: default avatarChris Lew <quic_clew@quicinc.com>
Reviewed-by: default avatarBjorn Andersson <quic_bjorande@quicinc.com>
Link: https://lore.kernel.org/r/20240529-hwspinlock-bust-v3-3-c8b924ffa5a2@quicinc.com


Signed-off-by: default avatarBjorn Andersson <andersson@kernel.org>
parent 855cf565

drivers/soc/qcom/smem.c

+26 −0
Original line number Diff line number Diff line
@@ -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

 *

include/linux/soc/qcom/smem.h

+2 −0
Original line number Diff line number Diff line
@@ -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_bust_hwspin_lock_by_host(unsigned int host);



#endif