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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: Helge Deller <deller@gmx.de>
This commit is contained in:
Helge Deller 2022-03-29 14:15:29 +02:00
parent 4d7d4c3fc1
commit db2b0d76cd
3 changed files with 42 additions and 1 deletions
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3
arch/parisc/include/asm/pdc.h
View File

@ -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";

3
arch/parisc/include/asm/pdcpat.h
View File

@ -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,

37
arch/parisc/kernel/firmware.c
View File

@ -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