qemu/target/ppc/power8-pmu-regs.c.inc

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target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
/*
* PMU register read/write functions for TCG IBM POWER chips
*
* Copyright IBM Corp. 2021
*
* Authors:
* Daniel Henrique Barboza <danielhb413@gmail.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#if defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY)
/*
* Checks whether the Group A SPR (MMCR0, MMCR2, MMCRA, and the
* PMCs) has problem state read access.
*
* Read acccess is granted for all PMCC values but 0b01, where a
* Facility Unavailable Interrupt will occur.
*/
static bool spr_groupA_read_allowed(DisasContext *ctx)
{
if (!ctx->mmcr0_pmcc0 && ctx->mmcr0_pmcc1) {
gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_PMU);
target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
return false;
}
return true;
}
/*
* Checks whether the Group A SPR (MMCR0, MMCR2, MMCRA, and the
* PMCs) has problem state write access.
*
* Write acccess is granted for PMCC values 0b10 and 0b11. Userspace
* writing with PMCC 0b00 will generate a Hypervisor Emulation
* Assistance Interrupt. Userspace writing with PMCC 0b01 will
* generate a Facility Unavailable Interrupt.
*/
static bool spr_groupA_write_allowed(DisasContext *ctx)
{
if (ctx->mmcr0_pmcc0) {
return true;
}
if (ctx->mmcr0_pmcc1) {
/* PMCC = 0b01 */
gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_PMU);
target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
} else {
/* PMCC = 0b00 */
gen_hvpriv_exception(ctx, POWERPC_EXCP_PRIV_REG);
target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
}
return false;
}
/*
* Helper function to avoid code repetition between MMCR0 and
* MMCR2 problem state write functions.
*/
static TCGv masked_gprn_for_spr_write(int gprn, int sprn,
uint64_t spr_mask)
{
TCGv ret = tcg_temp_new();
TCGv t0 = tcg_temp_new();
/* 'ret' starts with all mask bits cleared */
gen_load_spr(ret, sprn);
tcg_gen_andi_tl(ret, ret, ~(spr_mask));
/* Apply the mask into 'gprn' in a temp var */
tcg_gen_andi_tl(t0, cpu_gpr[gprn], spr_mask);
/* Add the masked gprn bits into 'ret' */
tcg_gen_or_tl(ret, ret, t0);
return ret;
}
target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn)
{
TCGv t0;
if (!spr_groupA_read_allowed(ctx)) {
return;
}
t0 = tcg_temp_new();
/*
* Filter out all bits but FC, PMAO, and PMAE, according
* to ISA v3.1, in 10.4.4 Monitor Mode Control Register 0,
* fourth paragraph.
*/
gen_load_spr(t0, SPR_POWER_MMCR0);
tcg_gen_andi_tl(t0, t0, MMCR0_UREG_MASK);
tcg_gen_mov_tl(cpu_gpr[gprn], t0);
}
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 19:57:18 +03:00
static void write_MMCR0_common(DisasContext *ctx, TCGv val)
{
/*
* helper_store_mmcr0 will make clock based operations that
* will cause 'bad icount read' errors if we do not execute
* gen_icount_io_start() beforehand.
*/
gen_icount_io_start(ctx);
gen_helper_store_mmcr0(cpu_env, val);
/*
* End the translation block because MMCR0 writes can change
* ctx->pmu_insn_cnt.
*/
ctx->base.is_jmp = DISAS_EXIT_UPDATE;
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 19:57:18 +03:00
}
target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
void spr_write_MMCR0_ureg(DisasContext *ctx, int sprn, int gprn)
{
TCGv masked_gprn;
target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
if (!spr_groupA_write_allowed(ctx)) {
return;
}
/*
* Filter out all bits but FC, PMAO, and PMAE, according
* to ISA v3.1, in 10.4.4 Monitor Mode Control Register 0,
* fourth paragraph.
*/
masked_gprn = masked_gprn_for_spr_write(gprn, SPR_POWER_MMCR0,
MMCR0_UREG_MASK);
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 19:57:18 +03:00
write_MMCR0_common(ctx, masked_gprn);
}
void spr_read_MMCR2_ureg(DisasContext *ctx, int gprn, int sprn)
{
TCGv t0;
if (!spr_groupA_read_allowed(ctx)) {
return;
}
t0 = tcg_temp_new();
/*
* On read, filter out all bits that are not FCnP0 bits.
* When MMCR0[PMCC] is set to 0b10 or 0b11, providing
* problem state programs read/write access to MMCR2,
* only the FCnP0 bits can be accessed. All other bits are
* not changed when mtspr is executed in problem state, and
* all other bits return 0s when mfspr is executed in problem
* state, according to ISA v3.1, section 10.4.6 Monitor Mode
* Control Register 2, p. 1316, third paragraph.
*/
gen_load_spr(t0, SPR_POWER_MMCR2);
tcg_gen_andi_tl(t0, t0, MMCR2_UREG_MASK);
tcg_gen_mov_tl(cpu_gpr[gprn], t0);
}
void spr_write_MMCR2_ureg(DisasContext *ctx, int sprn, int gprn)
{
TCGv masked_gprn;
if (!spr_groupA_write_allowed(ctx)) {
return;
}
/*
* Filter the bits that can be written using MMCR2_UREG_MASK,
* similar to what is done in spr_write_MMCR0_ureg().
*/
masked_gprn = masked_gprn_for_spr_write(gprn, SPR_POWER_MMCR2,
MMCR2_UREG_MASK);
gen_store_spr(SPR_POWER_MMCR2, masked_gprn);
target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
}
void spr_read_PMC(DisasContext *ctx, int gprn, int sprn)
{
TCGv_i32 t_sprn = tcg_constant_i32(sprn);
gen_icount_io_start(ctx);
gen_helper_read_pmc(cpu_gpr[gprn], cpu_env, t_sprn);
}
void spr_read_PMC14_ureg(DisasContext *ctx, int gprn, int sprn)
{
if (!spr_groupA_read_allowed(ctx)) {
return;
}
spr_read_PMC(ctx, gprn, sprn + 0x10);
}
void spr_read_PMC56_ureg(DisasContext *ctx, int gprn, int sprn)
{
/*
* If PMCC = 0b11, PMC5 and PMC6 aren't included in the Performance
* Monitor, and a read attempt results in a Facility Unavailable
* Interrupt.
*/
if (ctx->mmcr0_pmcc0 && ctx->mmcr0_pmcc1) {
gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_PMU);
return;
}
/* The remaining steps are similar to PMCs 1-4 userspace read */
spr_read_PMC14_ureg(ctx, gprn, sprn);
}
void spr_write_PMC(DisasContext *ctx, int sprn, int gprn)
{
TCGv_i32 t_sprn = tcg_constant_i32(sprn);
gen_icount_io_start(ctx);
gen_helper_store_pmc(cpu_env, t_sprn, cpu_gpr[gprn]);
}
void spr_write_PMC14_ureg(DisasContext *ctx, int sprn, int gprn)
{
if (!spr_groupA_write_allowed(ctx)) {
return;
}
spr_write_PMC(ctx, sprn + 0x10, gprn);
}
void spr_write_PMC56_ureg(DisasContext *ctx, int sprn, int gprn)
{
/*
* If PMCC = 0b11, PMC5 and PMC6 aren't included in the Performance
* Monitor, and a write attempt results in a Facility Unavailable
* Interrupt.
*/
if (ctx->mmcr0_pmcc0 && ctx->mmcr0_pmcc1) {
gen_exception_err(ctx, POWERPC_EXCP_FU, FSCR_IC_PMU);
return;
}
/* The remaining steps are similar to PMCs 1-4 userspace write */
spr_write_PMC14_ureg(ctx, sprn, gprn);
}
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 19:57:18 +03:00
void spr_write_MMCR0(DisasContext *ctx, int sprn, int gprn)
{
write_MMCR0_common(ctx, cpu_gpr[gprn]);
}
void spr_write_MMCR1(DisasContext *ctx, int sprn, int gprn)
{
gen_icount_io_start(ctx);
gen_helper_store_mmcr1(cpu_env, cpu_gpr[gprn]);
}
target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
#else
void spr_read_MMCR0_ureg(DisasContext *ctx, int gprn, int sprn)
{
spr_read_ureg(ctx, gprn, sprn);
}
void spr_write_MMCR0_ureg(DisasContext *ctx, int sprn, int gprn)
{
spr_noaccess(ctx, gprn, sprn);
}
void spr_read_MMCR2_ureg(DisasContext *ctx, int gprn, int sprn)
{
spr_read_ureg(ctx, gprn, sprn);
}
void spr_write_MMCR2_ureg(DisasContext *ctx, int sprn, int gprn)
{
spr_noaccess(ctx, gprn, sprn);
}
void spr_read_PMC14_ureg(DisasContext *ctx, int gprn, int sprn)
{
spr_read_ureg(ctx, gprn, sprn);
}
void spr_read_PMC56_ureg(DisasContext *ctx, int gprn, int sprn)
{
spr_read_ureg(ctx, gprn, sprn);
}
void spr_write_PMC14_ureg(DisasContext *ctx, int sprn, int gprn)
{
spr_noaccess(ctx, gprn, sprn);
}
void spr_write_PMC56_ureg(DisasContext *ctx, int sprn, int gprn)
{
spr_noaccess(ctx, gprn, sprn);
}
target/ppc: PMU basic cycle count for pseries TCG This patch adds the barebones of the PMU logic by enabling cycle counting. The overall logic goes as follows: - MMCR0 reg initial value is set to 0x80000000 (MMCR0_FC set) to avoid having to spin the PMU right at system init; - to retrieve the events that are being profiled, pmc_get_event() will check the current MMCR0 and MMCR1 value and return the appropriate PMUEventType. For PMCs 1-4, event 0x2 is the implementation dependent value of PMU_EVENT_INSTRUCTIONS and event 0x1E is the implementation dependent value of PMU_EVENT_CYCLES. These events are supported by IBM Power chips since Power8, at least, and the Linux Perf driver makes use of these events until kernel v5.15. For PMC1, event 0xF0 is the architected PowerISA event for cycles. Event 0xFE is the architected PowerISA event for instructions; - if the counter is frozen, either via the global MMCR0_FC bit or its individual frozen counter bits, PMU_EVENT_INACTIVE is returned; - pmu_update_cycles() will go through each counter and update the values of all PMCs that are counting cycles. This function will be called every time a MMCR0 update is done to keep counters values up to date. Upcoming patches will use this function to allow the counters to be properly updated during read/write of the PMCs and MMCR1 writes. Given that the base CPU frequency is fixed at 1Ghz for both powernv and pseries clock, cycle calculation assumes that 1 nanosecond equals 1 CPU cycle. Cycle value is then calculated by adding the elapsed time, in nanoseconds, of the last cycle update done via pmu_update_cycles(). Reviewed-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211201151734.654994-3-danielhb413@gmail.com> Signed-off-by: Cédric Le Goater <clg@kaod.org>
2021-12-17 19:57:18 +03:00
void spr_write_MMCR0(DisasContext *ctx, int sprn, int gprn)
{
spr_write_generic(ctx, sprn, gprn);
}
void spr_write_MMCR1(DisasContext *ctx, int sprn, int gprn)
{
spr_write_generic(ctx, sprn, gprn);
}
void spr_write_PMC(DisasContext *ctx, int sprn, int gprn)
{
spr_write_generic(ctx, sprn, gprn);
}
target/ppc: add user read/write functions for MMCR0 Userspace need access to PMU SPRs to be able to operate the PMU. One of such SPRs is MMCR0. MMCR0, as defined by PowerISA v3.1, is classified as a 'group A' PMU register. This class of registers has common read/write rules that are governed by MMCR0 PMCC bits. MMCR0 is also not fully exposed to problem state: only MMCR0_FC, MMCR0_PMAO and MMCR0_PMAE bits are readable/writable in this case. This patch exposes MMCR0 to userspace by doing the following: - two new callbacks, spr_read_MMCR0_ureg() and spr_write_MMCR0_ureg(), are added to be used as problem state read/write callbacks of UMMCR0. Both callbacks filters the amount of bits userspace is able to read/write by using a MMCR0_UREG_MASK; - problem state access control is done by the spr_groupA_read_allowed() and spr_groupA_write_allowed() helpers. These helpers will read the current PMCC bits from DisasContext and check whether the read/write MMCR0 operation is valid or noti; - to avoid putting exclusive PMU logic into the already loaded translate.c file, let's create a new 'power8-pmu-regs.c.inc' file that will hold all the spr_read/spr_write functions of PMU registers. The 'power8' name of this new file intends to hint about the proven support of the PMU logic to be added. The code has been tested with the IBM POWER chip family, POWER8 being the oldest version tested. This doesn't mean that the PMU logic will break with any other PPC64 chip that implements Book3s, but rather that we can't assert that it works properly with any Book3s compliant chip. CC: Gustavo Romero <gustavo.romero@linaro.org> Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20211018010133.315842-3-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2021-10-18 04:01:20 +03:00
#endif /* defined(TARGET_PPC64) && !defined(CONFIG_USER_ONLY) */