diff options
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/sysdev/xive/spapr.c | 52 |
1 files changed, 47 insertions, 5 deletions
diff --git a/arch/powerpc/sysdev/xive/spapr.c b/arch/powerpc/sysdev/xive/spapr.c index 091f1d0d0af1..864de3a733c7 100644 --- a/arch/powerpc/sysdev/xive/spapr.c +++ b/arch/powerpc/sysdev/xive/spapr.c @@ -19,6 +19,7 @@ #include <linux/spinlock.h> #include <linux/cpumask.h> #include <linux/mm.h> +#include <linux/delay.h> #include <asm/prom.h> #include <asm/io.h> @@ -108,6 +109,51 @@ static void xive_irq_bitmap_free(int irq) } } + +/* Based on the similar routines in RTAS */ +static unsigned int plpar_busy_delay_time(long rc) +{ + unsigned int ms = 0; + + if (H_IS_LONG_BUSY(rc)) { + ms = get_longbusy_msecs(rc); + } else if (rc == H_BUSY) { + ms = 10; /* seems appropriate for XIVE hcalls */ + } + + return ms; +} + +static unsigned int plpar_busy_delay(int rc) +{ + unsigned int ms; + + ms = plpar_busy_delay_time(rc); + if (ms) + mdelay(ms); + + return ms; +} + +/* + * Note: this call has a partition wide scope and can take a while to + * complete. If it returns H_LONG_BUSY_* it should be retried + * periodically. + */ +static long plpar_int_reset(unsigned long flags) +{ + long rc; + + do { + rc = plpar_hcall_norets(H_INT_RESET, flags); + } while (plpar_busy_delay(rc)); + + if (rc) + pr_err("H_INT_RESET failed %ld\n", rc); + + return rc; +} + static long plpar_int_get_source_info(unsigned long flags, unsigned long lisn, unsigned long *src_flags, @@ -445,11 +491,7 @@ static void xive_spapr_put_ipi(unsigned int cpu, struct xive_cpu *xc) static void xive_spapr_shutdown(void) { - long rc; - - rc = plpar_hcall_norets(H_INT_RESET, 0); - if (rc) - pr_err("H_INT_RESET failed %ld\n", rc); + plpar_int_reset(0); } /* |