Commit db2b0d76 authored by Helge Deller's avatar Helge Deller
Browse files

parisc: Add PDC locking functions for rendezvous code 



Add pdc_cpu_rendezvous_lock() and pdc_cpu_rendezvous_unlock()
to lock PDC while CPU is transitioning into rendezvous state.
This is needed, because the transition phase may take up to 8 seconds.

Add pdc_pat_get_PDC_entrypoint() to get PDC entry point for current CPU.

Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 4d7d4c3f

arch/parisc/include/asm/pdc.h

+3 −0
Original line number Diff line number Diff line
@@ -94,6 +94,9 @@ int pdc_sti_call(unsigned long func, unsigned long flags, 
                 unsigned long glob_cfg);



int __pdc_cpu_rendezvous(void);

void pdc_cpu_rendezvous_lock(void);

void pdc_cpu_rendezvous_unlock(void);



static inline char * os_id_to_string(u16 os_id) {

	switch(os_id) {

	case OS_ID_NONE:	return "No OS";

arch/parisc/include/asm/pdcpat.h

+2 −1
Original line number Diff line number Diff line
@@ -83,6 +83,7 @@ 
#define PDC_PAT_CPU_RENDEZVOUS      	6L /* Rendezvous CPU */

#define PDC_PAT_CPU_GET_CLOCK_INFO  	7L /* Return CPU Clock info */

#define PDC_PAT_CPU_GET_RENDEZVOUS_STATE 8L /* Return Rendezvous State */

#define PDC_PAT_CPU_GET_PDC_ENTRYPOINT	11L /* Return PDC Entry point */

#define PDC_PAT_CPU_PLUNGE_FABRIC 	128L /* Plunge Fabric */

#define PDC_PAT_CPU_UPDATE_CACHE_CLEANSING 129L /* Manipulate Cache 

                                                 * Cleansing Mode */
@@ -356,7 +357,7 @@ struct pdc_pat_cell_mod_maddr_block { /* PDC_PAT_CELL_MODULE */ 


typedef struct pdc_pat_cell_mod_maddr_block pdc_pat_cell_mod_maddr_block_t;





extern int pdc_pat_get_PDC_entrypoint(unsigned long *pdc_entry);

extern int pdc_pat_chassis_send_log(unsigned long status, unsigned long data);

extern int pdc_pat_cell_get_number(struct pdc_pat_cell_num *cell_info);

extern int pdc_pat_cell_info(struct pdc_pat_cell_info_rtn_block *info,

arch/parisc/kernel/firmware.c

+37 −0
Original line number Diff line number Diff line
@@ -329,7 +329,44 @@ int __pdc_cpu_rendezvous(void) 
		return mem_pdc_call(PDC_PROC, 1, 0);

}



/**

 * pdc_cpu_rendezvous_lock - Lock PDC while transitioning to rendezvous state

 */

void pdc_cpu_rendezvous_lock(void)

{

	spin_lock(&pdc_lock);

}



/**

 * pdc_cpu_rendezvous_unlock - Unlock PDC after reaching rendezvous state

 */

void pdc_cpu_rendezvous_unlock(void)

{

	spin_unlock(&pdc_lock);

}



/**

 * pdc_pat_get_PDC_entrypoint - Get PDC entry point for current CPU

 * @retval: -1 on error, 0 on success

 */

int pdc_pat_get_PDC_entrypoint(unsigned long *pdc_entry)

{

	int retval = 0;

	unsigned long flags;



	if (!IS_ENABLED(CONFIG_SMP) || !is_pdc_pat()) {

		*pdc_entry = MEM_PDC;

		return 0;

	}



	spin_lock_irqsave(&pdc_lock, flags);

	retval = mem_pdc_call(PDC_PAT_CPU, PDC_PAT_CPU_GET_PDC_ENTRYPOINT,

			__pa(pdc_result));

	*pdc_entry = pdc_result[0];

	spin_unlock_irqrestore(&pdc_lock, flags);



	return retval;

}

/**

 * pdc_chassis_warn - Fetches chassis warnings

 * @retval: -1 on error, 0 on success