Current File : //usr/src/linux-headers-5.15.0-43/arch/powerpc/include/asm/plpar_wrappers.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_POWERPC_PLPAR_WRAPPERS_H
#define _ASM_POWERPC_PLPAR_WRAPPERS_H
#ifdef CONFIG_PPC_PSERIES
#include <linux/string.h>
#include <linux/irqflags.h>
#include <asm/hvcall.h>
#include <asm/paca.h>
#include <asm/page.h>
static inline long poll_pending(void)
{
return plpar_hcall_norets(H_POLL_PENDING);
}
static inline u8 get_cede_latency_hint(void)
{
return get_lppaca()->cede_latency_hint;
}
static inline void set_cede_latency_hint(u8 latency_hint)
{
get_lppaca()->cede_latency_hint = latency_hint;
}
static inline long cede_processor(void)
{
/*
* We cannot call tracepoints inside RCU idle regions which
* means we must not trace H_CEDE.
*/
return plpar_hcall_norets_notrace(H_CEDE);
}
static inline long extended_cede_processor(unsigned long latency_hint)
{
long rc;
u8 old_latency_hint = get_cede_latency_hint();
set_cede_latency_hint(latency_hint);
rc = cede_processor();
#ifdef CONFIG_PPC_IRQ_SOFT_MASK_DEBUG
/* Ensure that H_CEDE returns with IRQs on */
if (WARN_ON(!(mfmsr() & MSR_EE)))
__hard_irq_enable();
#endif
set_cede_latency_hint(old_latency_hint);
return rc;
}
static inline long vpa_call(unsigned long flags, unsigned long cpu,
unsigned long vpa)
{
flags = flags << H_VPA_FUNC_SHIFT;
return plpar_hcall_norets(H_REGISTER_VPA, flags, cpu, vpa);
}
static inline long unregister_vpa(unsigned long cpu)
{
return vpa_call(H_VPA_DEREG_VPA, cpu, 0);
}
static inline long register_vpa(unsigned long cpu, unsigned long vpa)
{
return vpa_call(H_VPA_REG_VPA, cpu, vpa);
}
static inline long unregister_slb_shadow(unsigned long cpu)
{
return vpa_call(H_VPA_DEREG_SLB, cpu, 0);
}
static inline long register_slb_shadow(unsigned long cpu, unsigned long vpa)
{
return vpa_call(H_VPA_REG_SLB, cpu, vpa);
}
static inline long unregister_dtl(unsigned long cpu)
{
return vpa_call(H_VPA_DEREG_DTL, cpu, 0);
}
static inline long register_dtl(unsigned long cpu, unsigned long vpa)
{
return vpa_call(H_VPA_REG_DTL, cpu, vpa);
}
extern void vpa_init(int cpu);
static inline long plpar_pte_enter(unsigned long flags,
unsigned long hpte_group, unsigned long hpte_v,
unsigned long hpte_r, unsigned long *slot)
{
long rc;
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
rc = plpar_hcall(H_ENTER, retbuf, flags, hpte_group, hpte_v, hpte_r);
*slot = retbuf[0];
return rc;
}
static inline long plpar_pte_remove(unsigned long flags, unsigned long ptex,
unsigned long avpn, unsigned long *old_pteh_ret,
unsigned long *old_ptel_ret)
{
long rc;
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
rc = plpar_hcall(H_REMOVE, retbuf, flags, ptex, avpn);
*old_pteh_ret = retbuf[0];
*old_ptel_ret = retbuf[1];
return rc;
}
/* plpar_pte_remove_raw can be called in real mode. It calls plpar_hcall_raw */
static inline long plpar_pte_remove_raw(unsigned long flags, unsigned long ptex,
unsigned long avpn, unsigned long *old_pteh_ret,
unsigned long *old_ptel_ret)
{
long rc;
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
rc = plpar_hcall_raw(H_REMOVE, retbuf, flags, ptex, avpn);
*old_pteh_ret = retbuf[0];
*old_ptel_ret = retbuf[1];
return rc;
}
static inline long plpar_pte_read(unsigned long flags, unsigned long ptex,
unsigned long *old_pteh_ret, unsigned long *old_ptel_ret)
{
long rc;
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
rc = plpar_hcall(H_READ, retbuf, flags, ptex);
*old_pteh_ret = retbuf[0];
*old_ptel_ret = retbuf[1];
return rc;
}
/* plpar_pte_read_raw can be called in real mode. It calls plpar_hcall_raw */
static inline long plpar_pte_read_raw(unsigned long flags, unsigned long ptex,
unsigned long *old_pteh_ret, unsigned long *old_ptel_ret)
{
long rc;
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
rc = plpar_hcall_raw(H_READ, retbuf, flags, ptex);
*old_pteh_ret = retbuf[0];
*old_ptel_ret = retbuf[1];
return rc;
}
/*
* ptes must be 8*sizeof(unsigned long)
*/
static inline long plpar_pte_read_4(unsigned long flags, unsigned long ptex,
unsigned long *ptes)
{
long rc;
unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
rc = plpar_hcall9(H_READ, retbuf, flags | H_READ_4, ptex);
memcpy(ptes, retbuf, 8*sizeof(unsigned long));
return rc;
}
/*
* plpar_pte_read_4_raw can be called in real mode.
* ptes must be 8*sizeof(unsigned long)
*/
static inline long plpar_pte_read_4_raw(unsigned long flags, unsigned long ptex,
unsigned long *ptes)
{
long rc;
unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
rc = plpar_hcall9_raw(H_READ, retbuf, flags | H_READ_4, ptex);
memcpy(ptes, retbuf, 8*sizeof(unsigned long));
return rc;
}
static inline long plpar_pte_protect(unsigned long flags, unsigned long ptex,
unsigned long avpn)
{
return plpar_hcall_norets(H_PROTECT, flags, ptex, avpn);
}
static inline long plpar_resize_hpt_prepare(unsigned long flags,
unsigned long shift)
{
return plpar_hcall_norets(H_RESIZE_HPT_PREPARE, flags, shift);
}
static inline long plpar_resize_hpt_commit(unsigned long flags,
unsigned long shift)
{
return plpar_hcall_norets(H_RESIZE_HPT_COMMIT, flags, shift);
}
static inline long plpar_tce_get(unsigned long liobn, unsigned long ioba,
unsigned long *tce_ret)
{
long rc;
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
rc = plpar_hcall(H_GET_TCE, retbuf, liobn, ioba);
*tce_ret = retbuf[0];
return rc;
}
static inline long plpar_tce_put(unsigned long liobn, unsigned long ioba,
unsigned long tceval)
{
return plpar_hcall_norets(H_PUT_TCE, liobn, ioba, tceval);
}
static inline long plpar_tce_put_indirect(unsigned long liobn,
unsigned long ioba, unsigned long page, unsigned long count)
{
return plpar_hcall_norets(H_PUT_TCE_INDIRECT, liobn, ioba, page, count);
}
static inline long plpar_tce_stuff(unsigned long liobn, unsigned long ioba,
unsigned long tceval, unsigned long count)
{
return plpar_hcall_norets(H_STUFF_TCE, liobn, ioba, tceval, count);
}
/* Set various resource mode parameters */
static inline long plpar_set_mode(unsigned long mflags, unsigned long resource,
unsigned long value1, unsigned long value2)
{
return plpar_hcall_norets(H_SET_MODE, mflags, resource, value1, value2);
}
/*
* Enable relocation on exceptions on this partition
*
* 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 until it
* returns H_SUCCESS.
*/
static inline long enable_reloc_on_exceptions(void)
{
/* mflags = 3: Exceptions at 0xC000000000004000 */
return plpar_set_mode(3, H_SET_MODE_RESOURCE_ADDR_TRANS_MODE, 0, 0);
}
/*
* Disable relocation on exceptions on this partition
*
* 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 until it
* returns H_SUCCESS.
*/
static inline long disable_reloc_on_exceptions(void) {
return plpar_set_mode(0, H_SET_MODE_RESOURCE_ADDR_TRANS_MODE, 0, 0);
}
/*
* Take exceptions in big endian mode on this partition
*
* 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 until it
* returns H_SUCCESS.
*/
static inline long enable_big_endian_exceptions(void)
{
/* mflags = 0: big endian exceptions */
return plpar_set_mode(0, H_SET_MODE_RESOURCE_LE, 0, 0);
}
/*
* Take exceptions in little endian mode on this partition
*
* 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 until it
* returns H_SUCCESS.
*/
static inline long enable_little_endian_exceptions(void)
{
/* mflags = 1: little endian exceptions */
return plpar_set_mode(1, H_SET_MODE_RESOURCE_LE, 0, 0);
}
static inline long plpar_set_ciabr(unsigned long ciabr)
{
return plpar_set_mode(0, H_SET_MODE_RESOURCE_SET_CIABR, ciabr, 0);
}
static inline long plpar_set_watchpoint0(unsigned long dawr0, unsigned long dawrx0)
{
return plpar_set_mode(0, H_SET_MODE_RESOURCE_SET_DAWR0, dawr0, dawrx0);
}
static inline long plpar_set_watchpoint1(unsigned long dawr1, unsigned long dawrx1)
{
return plpar_set_mode(0, H_SET_MODE_RESOURCE_SET_DAWR1, dawr1, dawrx1);
}
static inline long plpar_signal_sys_reset(long cpu)
{
return plpar_hcall_norets(H_SIGNAL_SYS_RESET, cpu);
}
static inline long plpar_get_cpu_characteristics(struct h_cpu_char_result *p)
{
unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
long rc;
rc = plpar_hcall(H_GET_CPU_CHARACTERISTICS, retbuf);
if (rc == H_SUCCESS) {
p->character = retbuf[0];
p->behaviour = retbuf[1];
}
return rc;
}
/*
* Wrapper to H_RPT_INVALIDATE hcall that handles return values appropriately
*
* - Returns H_SUCCESS on success
* - For H_BUSY return value, we retry the hcall.
* - For any other hcall failures, attempt a full flush once before
* resorting to BUG().
*
* Note: This hcall is expected to fail only very rarely. The correct
* error recovery of killing the process/guest will be eventually
* needed.
*/
static inline long pseries_rpt_invalidate(u32 pid, u64 target, u64 type,
u64 page_sizes, u64 start, u64 end)
{
long rc;
unsigned long all;
while (true) {
rc = plpar_hcall_norets(H_RPT_INVALIDATE, pid, target, type,
page_sizes, start, end);
if (rc == H_BUSY) {
cpu_relax();
continue;
} else if (rc == H_SUCCESS)
return rc;
/* Flush request failed, try with a full flush once */
if (type & H_RPTI_TYPE_NESTED)
all = H_RPTI_TYPE_NESTED | H_RPTI_TYPE_NESTED_ALL;
else
all = H_RPTI_TYPE_ALL;
retry:
rc = plpar_hcall_norets(H_RPT_INVALIDATE, pid, target,
all, page_sizes, 0, -1UL);
if (rc == H_BUSY) {
cpu_relax();
goto retry;
} else if (rc == H_SUCCESS)
return rc;
BUG();
}
}
#else /* !CONFIG_PPC_PSERIES */
static inline long plpar_set_ciabr(unsigned long ciabr)
{
return 0;
}
static inline long plpar_pte_read_4(unsigned long flags, unsigned long ptex,
unsigned long *ptes)
{
return 0;
}
static inline long pseries_rpt_invalidate(u32 pid, u64 target, u64 type,
u64 page_sizes, u64 start, u64 end)
{
return 0;
}
#endif /* CONFIG_PPC_PSERIES */
#endif /* _ASM_POWERPC_PLPAR_WRAPPERS_H */
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