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authorHelge Deller <deller@gmx.de>2022-03-29 14:15:29 +0200
committerHelge Deller <deller@gmx.de>2022-03-29 21:37:12 +0200
commitdb2b0d76cdc4e781d32bf26d0c649ca2fe608c4e (patch)
tree36b7cf9d67d48b39850a6585e15343da2361066c /arch
parent4d7d4c3fc1aed6bf95fa188c30bc9ba5901f6531 (diff)
downloadlinux-db2b0d76cdc4e781d32bf26d0c649ca2fe608c4e.tar.bz2
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/parisc/include/asm/pdc.h3
-rw-r--r--arch/parisc/include/asm/pdcpat.h3
-rw-r--r--arch/parisc/kernel/firmware.c37
3 files changed, 42 insertions, 1 deletions
diff --git a/arch/parisc/include/asm/pdc.h b/arch/parisc/include/asm/pdc.h
index 18b957a8630d..b643092d4b98 100644
--- a/arch/parisc/include/asm/pdc.h
+++ b/arch/parisc/include/asm/pdc.h
@@ -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";
diff --git a/arch/parisc/include/asm/pdcpat.h b/arch/parisc/include/asm/pdcpat.h
index 24355ed1453a..8f160375b865 100644
--- a/arch/parisc/include/asm/pdcpat.h
+++ b/arch/parisc/include/asm/pdcpat.h
@@ -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,
diff --git a/arch/parisc/kernel/firmware.c b/arch/parisc/kernel/firmware.c
index c6b11bdb8602..6a7e315bcc2e 100644
--- a/arch/parisc/kernel/firmware.c
+++ b/arch/parisc/kernel/firmware.c
@@ -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