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c49f63530b
linux_dsm_epyc7002/arch/powerpc/platforms/powernv/opal-wrappers.S
Anton Blanchard c49f63530b powernv: Add OPAL tracepoints 
Knowing how long we spend in firmware calls is an important part of
minimising OS jitter.

This patch adds tracepoints to each OPAL call. If tracepoints are
enabled we branch out to a common routine that calls an entry and exit
tracepoint.

This allows us to write tools that monitor the frequency and duration
of OPAL calls, eg:

name                  count  total(ms)  min(ms)  max(ms)  avg(ms)  period(ms)
OPAL_HANDLE_INTERRUPT     5      0.199    0.037    0.042    0.040   12547.545
OPAL_POLL_EVENTS        204      2.590    0.012    0.036    0.013    2264.899
OPAL_PCI_MSI_EOI       2830      3.066    0.001    0.005    0.001      81.166

We use jump labels if configured, which means we only add a single
nop instruction to every OPAL call when the tracepoints are disabled.

Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
2014-07-11 16:06:08 +10:00

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/*
* PowerNV OPAL API wrappers
*
* Copyright 2011 IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <asm/ppc_asm.h>
#include <asm/hvcall.h>
#include <asm/asm-offsets.h>
#include <asm/opal.h>
#include <asm/jump_label.h>
.section ".text"
#ifdef CONFIG_TRACEPOINTS
#ifdef CONFIG_JUMP_LABEL
#define OPAL_BRANCH(LABEL) \
ARCH_STATIC_BRANCH(LABEL, opal_tracepoint_key)
#else
.section ".toc","aw"
.globl opal_tracepoint_refcount
opal_tracepoint_refcount:
.llong 0
.section ".text"
/*
* We branch around this in early init by using an unconditional cpu
* feature.
*/
#define OPAL_BRANCH(LABEL) \
BEGIN_FTR_SECTION; \
b 1f; \
END_FTR_SECTION(0, 1); \
ld r12,opal_tracepoint_refcount@toc(r2); \
std r12,32(r1); \
cmpdi r12,0; \
bne- LABEL; \
1:
#endif
#else
#define OPAL_BRANCH(LABEL)
#endif
/* TODO:
*
* - Trace irqs in/off (needs saving/restoring all args, argh...)
* - Get r11 feed up by Dave so I can have better register usage
*/
#define OPAL_CALL(name, token) \
_GLOBAL(name); \
mflr r0; \
std r0,16(r1); \
li r0,token; \
OPAL_BRANCH(opal_tracepoint_entry) \
mfcr r12; \
stw r12,8(r1); \
std r1,PACAR1(r13); \
li r11,0; \
mfmsr r12; \
ori r11,r11,MSR_EE; \
std r12,PACASAVEDMSR(r13); \
andc r12,r12,r11; \
mtmsrd r12,1; \
LOAD_REG_ADDR(r11,opal_return); \
mtlr r11; \
li r11,MSR_DR|MSR_IR|MSR_LE;\
andc r12,r12,r11; \
mtspr SPRN_HSRR1,r12; \
LOAD_REG_ADDR(r11,opal); \
ld r12,8(r11); \
ld r2,0(r11); \
mtspr SPRN_HSRR0,r12; \
hrfid
opal_return:
/*
* Fixup endian on OPAL return... we should be able to simplify
* this by instead converting the below trampoline to a set of
* bytes (always BE) since MSR:LE will end up fixed up as a side
* effect of the rfid.
*/
FIXUP_ENDIAN
ld r2,PACATOC(r13);
lwz r4,8(r1);
ld r5,16(r1);
ld r6,PACASAVEDMSR(r13);
mtspr SPRN_SRR0,r5;
mtspr SPRN_SRR1,r6;
mtcr r4;
rfid
#ifdef CONFIG_TRACEPOINTS
opal_tracepoint_entry:
stdu r1,-STACKFRAMESIZE(r1)
std r0,STK_REG(R23)(r1)
std r3,STK_REG(R24)(r1)
std r4,STK_REG(R25)(r1)
std r5,STK_REG(R26)(r1)
std r6,STK_REG(R27)(r1)
std r7,STK_REG(R28)(r1)
std r8,STK_REG(R29)(r1)
std r9,STK_REG(R30)(r1)
std r10,STK_REG(R31)(r1)
mr r3,r0
addi r4,r1,STK_REG(R24)
bl __trace_opal_entry
ld r0,STK_REG(R23)(r1)
ld r3,STK_REG(R24)(r1)
ld r4,STK_REG(R25)(r1)
ld r5,STK_REG(R26)(r1)
ld r6,STK_REG(R27)(r1)
ld r7,STK_REG(R28)(r1)
ld r8,STK_REG(R29)(r1)
ld r9,STK_REG(R30)(r1)
ld r10,STK_REG(R31)(r1)
LOAD_REG_ADDR(r11,opal_tracepoint_return)
mfcr r12
std r11,16(r1)
stw r12,8(r1)
std r1,PACAR1(r13)
li r11,0
mfmsr r12
ori r11,r11,MSR_EE
std r12,PACASAVEDMSR(r13)
andc r12,r12,r11
mtmsrd r12,1
LOAD_REG_ADDR(r11,opal_return)
mtlr r11
li r11,MSR_DR|MSR_IR|MSR_LE
andc r12,r12,r11
mtspr SPRN_HSRR1,r12
LOAD_REG_ADDR(r11,opal)
ld r12,8(r11)
ld r2,0(r11)
mtspr SPRN_HSRR0,r12
hrfid
opal_tracepoint_return:
std r3,STK_REG(R31)(r1)
mr r4,r3
ld r0,STK_REG(R23)(r1)
bl __trace_opal_exit
ld r3,STK_REG(R31)(r1)
addi r1,r1,STACKFRAMESIZE
ld r0,16(r1)
mtlr r0
blr
#endif
OPAL_CALL(opal_invalid_call, OPAL_INVALID_CALL);
OPAL_CALL(opal_console_write, OPAL_CONSOLE_WRITE);
OPAL_CALL(opal_console_read, OPAL_CONSOLE_READ);
OPAL_CALL(opal_console_write_buffer_space, OPAL_CONSOLE_WRITE_BUFFER_SPACE);
OPAL_CALL(opal_rtc_read, OPAL_RTC_READ);
OPAL_CALL(opal_rtc_write, OPAL_RTC_WRITE);
OPAL_CALL(opal_cec_power_down, OPAL_CEC_POWER_DOWN);
OPAL_CALL(opal_cec_reboot, OPAL_CEC_REBOOT);
OPAL_CALL(opal_read_nvram, OPAL_READ_NVRAM);
OPAL_CALL(opal_write_nvram, OPAL_WRITE_NVRAM);
OPAL_CALL(opal_handle_interrupt, OPAL_HANDLE_INTERRUPT);
OPAL_CALL(opal_poll_events, OPAL_POLL_EVENTS);
OPAL_CALL(opal_pci_set_hub_tce_memory, OPAL_PCI_SET_HUB_TCE_MEMORY);
OPAL_CALL(opal_pci_set_phb_tce_memory, OPAL_PCI_SET_PHB_TCE_MEMORY);
OPAL_CALL(opal_pci_config_read_byte, OPAL_PCI_CONFIG_READ_BYTE);
OPAL_CALL(opal_pci_config_read_half_word, OPAL_PCI_CONFIG_READ_HALF_WORD);
OPAL_CALL(opal_pci_config_read_word, OPAL_PCI_CONFIG_READ_WORD);
OPAL_CALL(opal_pci_config_write_byte, OPAL_PCI_CONFIG_WRITE_BYTE);
OPAL_CALL(opal_pci_config_write_half_word, OPAL_PCI_CONFIG_WRITE_HALF_WORD);
OPAL_CALL(opal_pci_config_write_word, OPAL_PCI_CONFIG_WRITE_WORD);
OPAL_CALL(opal_set_xive, OPAL_SET_XIVE);
OPAL_CALL(opal_get_xive, OPAL_GET_XIVE);
OPAL_CALL(opal_register_exception_handler, OPAL_REGISTER_OPAL_EXCEPTION_HANDLER);
OPAL_CALL(opal_pci_eeh_freeze_status, OPAL_PCI_EEH_FREEZE_STATUS);
OPAL_CALL(opal_pci_eeh_freeze_clear, OPAL_PCI_EEH_FREEZE_CLEAR);
OPAL_CALL(opal_pci_shpc, OPAL_PCI_SHPC);
OPAL_CALL(opal_pci_phb_mmio_enable, OPAL_PCI_PHB_MMIO_ENABLE);
OPAL_CALL(opal_pci_set_phb_mem_window, OPAL_PCI_SET_PHB_MEM_WINDOW);
OPAL_CALL(opal_pci_map_pe_mmio_window, OPAL_PCI_MAP_PE_MMIO_WINDOW);
OPAL_CALL(opal_pci_set_phb_table_memory, OPAL_PCI_SET_PHB_TABLE_MEMORY);
OPAL_CALL(opal_pci_set_pe, OPAL_PCI_SET_PE);
OPAL_CALL(opal_pci_set_peltv, OPAL_PCI_SET_PELTV);
OPAL_CALL(opal_pci_set_mve, OPAL_PCI_SET_MVE);
OPAL_CALL(opal_pci_set_mve_enable, OPAL_PCI_SET_MVE_ENABLE);
OPAL_CALL(opal_pci_get_xive_reissue, OPAL_PCI_GET_XIVE_REISSUE);
OPAL_CALL(opal_pci_set_xive_reissue, OPAL_PCI_SET_XIVE_REISSUE);
OPAL_CALL(opal_pci_set_xive_pe, OPAL_PCI_SET_XIVE_PE);
OPAL_CALL(opal_get_xive_source, OPAL_GET_XIVE_SOURCE);
OPAL_CALL(opal_get_msi_32, OPAL_GET_MSI_32);
OPAL_CALL(opal_get_msi_64, OPAL_GET_MSI_64);
OPAL_CALL(opal_start_cpu, OPAL_START_CPU);
OPAL_CALL(opal_query_cpu_status, OPAL_QUERY_CPU_STATUS);
OPAL_CALL(opal_write_oppanel, OPAL_WRITE_OPPANEL);
OPAL_CALL(opal_pci_map_pe_dma_window, OPAL_PCI_MAP_PE_DMA_WINDOW);
OPAL_CALL(opal_pci_map_pe_dma_window_real, OPAL_PCI_MAP_PE_DMA_WINDOW_REAL);
OPAL_CALL(opal_pci_reset, OPAL_PCI_RESET);
OPAL_CALL(opal_pci_get_hub_diag_data, OPAL_PCI_GET_HUB_DIAG_DATA);
OPAL_CALL(opal_pci_get_phb_diag_data, OPAL_PCI_GET_PHB_DIAG_DATA);
OPAL_CALL(opal_pci_fence_phb, OPAL_PCI_FENCE_PHB);
OPAL_CALL(opal_pci_reinit, OPAL_PCI_REINIT);
OPAL_CALL(opal_pci_mask_pe_error, OPAL_PCI_MASK_PE_ERROR);
OPAL_CALL(opal_set_slot_led_status, OPAL_SET_SLOT_LED_STATUS);
OPAL_CALL(opal_get_epow_status, OPAL_GET_EPOW_STATUS);
OPAL_CALL(opal_set_system_attention_led, OPAL_SET_SYSTEM_ATTENTION_LED);
OPAL_CALL(opal_pci_next_error, OPAL_PCI_NEXT_ERROR);
OPAL_CALL(opal_pci_poll, OPAL_PCI_POLL);
OPAL_CALL(opal_pci_msi_eoi, OPAL_PCI_MSI_EOI);
OPAL_CALL(opal_pci_get_phb_diag_data2, OPAL_PCI_GET_PHB_DIAG_DATA2);
OPAL_CALL(opal_xscom_read, OPAL_XSCOM_READ);
OPAL_CALL(opal_xscom_write, OPAL_XSCOM_WRITE);
OPAL_CALL(opal_lpc_read, OPAL_LPC_READ);
OPAL_CALL(opal_lpc_write, OPAL_LPC_WRITE);
OPAL_CALL(opal_return_cpu, OPAL_RETURN_CPU);
OPAL_CALL(opal_reinit_cpus, OPAL_REINIT_CPUS);
OPAL_CALL(opal_read_elog, OPAL_ELOG_READ);
OPAL_CALL(opal_send_ack_elog, OPAL_ELOG_ACK);
OPAL_CALL(opal_get_elog_size, OPAL_ELOG_SIZE);
OPAL_CALL(opal_resend_pending_logs, OPAL_ELOG_RESEND);
OPAL_CALL(opal_write_elog, OPAL_ELOG_WRITE);
OPAL_CALL(opal_validate_flash, OPAL_FLASH_VALIDATE);
OPAL_CALL(opal_manage_flash, OPAL_FLASH_MANAGE);
OPAL_CALL(opal_update_flash, OPAL_FLASH_UPDATE);
OPAL_CALL(opal_resync_timebase, OPAL_RESYNC_TIMEBASE);
OPAL_CALL(opal_dump_init, OPAL_DUMP_INIT);
OPAL_CALL(opal_dump_info, OPAL_DUMP_INFO);
OPAL_CALL(opal_dump_info2, OPAL_DUMP_INFO2);
OPAL_CALL(opal_dump_read, OPAL_DUMP_READ);
OPAL_CALL(opal_dump_ack, OPAL_DUMP_ACK);
OPAL_CALL(opal_get_msg, OPAL_GET_MSG);
OPAL_CALL(opal_check_completion, OPAL_CHECK_ASYNC_COMPLETION);
OPAL_CALL(opal_dump_resend_notification, OPAL_DUMP_RESEND);
OPAL_CALL(opal_sync_host_reboot, OPAL_SYNC_HOST_REBOOT);
OPAL_CALL(opal_sensor_read, OPAL_SENSOR_READ);
OPAL_CALL(opal_get_param, OPAL_GET_PARAM);
OPAL_CALL(opal_set_param, OPAL_SET_PARAM);
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