* [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids @ 2017-06-13 14:17 George Cherian 2017-06-13 14:17 ` [PATCH 1/2] mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file George Cherian ` (2 more replies) 0 siblings, 3 replies; 11+ messages in thread From: George Cherian @ 2017-06-13 14:17 UTC (permalink / raw) To: linux-acpi, linux-kernel, devel Cc: rjw, lenb, jassisinghbrar, robert.moore, lv.zheng, George Cherian The current cppc acpi driver works with only one pcc subspace id. It maintains and registers only one pcc channel even if the acpi table has different pcc subspace ids. As per ACPI 6.2 spec all PCC registers, for all processors in the same performance domain (as defined by _PSD), must be defined to be in the same subspace. The series tries to address the same by making cppc acpi driver aware of multiple possible pcc subspace ids. Patch 1 : In preparation to share the MAX_PCC_SUBSPACE definition with cppc acpi driver Patch 2 : Make the cppc acpi driver aware of multiple pcc subspace ids. George Cherian (2): mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids drivers/acpi/cppc_acpi.c | 179 +++++++++++++++++++++++++---------------------- drivers/mailbox/pcc.c | 1 - include/acpi/pcc.h | 1 + 3 files changed, 97 insertions(+), 84 deletions(-) -- 2.7.4 ^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH 1/2] mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file 2017-06-13 14:17 [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids George Cherian @ 2017-06-13 14:17 ` George Cherian 2017-06-13 14:17 ` [PATCH 2/2] ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids George Cherian 2017-06-28 21:20 ` [PATCH 0/2] " Rafael J. Wysocki 2 siblings, 0 replies; 11+ messages in thread From: George Cherian @ 2017-06-13 14:17 UTC (permalink / raw) To: linux-acpi, linux-kernel, devel Cc: rjw, lenb, jassisinghbrar, robert.moore, lv.zheng, George Cherian Move the MAX_PCC_SUBSPACES definition to acpi/pcc.h file. In preparation to add subspace id support for cppc_acpi driver. Signed-off-by: George Cherian <george.cherian@cavium.com> --- drivers/mailbox/pcc.c | 1 - include/acpi/pcc.h | 1 + 2 files changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c index dd9ecd35..9987b8f 100644 --- a/drivers/mailbox/pcc.c +++ b/drivers/mailbox/pcc.c @@ -69,7 +69,6 @@ #include "mailbox.h" -#define MAX_PCC_SUBSPACES 256 #define MBOX_IRQ_NAME "pcc-mbox" static struct mbox_chan *pcc_mbox_channels; diff --git a/include/acpi/pcc.h b/include/acpi/pcc.h index 8caa79c..cd6ef45 100644 --- a/include/acpi/pcc.h +++ b/include/acpi/pcc.h @@ -13,6 +13,7 @@ #include <linux/mailbox_controller.h> #include <linux/mailbox_client.h> +#define MAX_PCC_SUBSPACES 256 #ifdef CONFIG_PCC extern struct mbox_chan *pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id); -- 2.7.4 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* [PATCH 2/2] ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids 2017-06-13 14:17 [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids George Cherian 2017-06-13 14:17 ` [PATCH 1/2] mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file George Cherian @ 2017-06-13 14:17 ` George Cherian 2017-07-13 21:44 ` Prakash, Prashanth 2017-06-28 21:20 ` [PATCH 0/2] " Rafael J. Wysocki 2 siblings, 1 reply; 11+ messages in thread From: George Cherian @ 2017-06-13 14:17 UTC (permalink / raw) To: linux-acpi, linux-kernel, devel Cc: rjw, lenb, jassisinghbrar, robert.moore, lv.zheng, George Cherian Based on ACPI 6.2 Section 8.4.7.1.9 If the PCC register space is used, all PCC registers, for all processors in the same performance domain (as defined by _PSD), must be defined to be in the same subspace. Based on Section 14.1 of ACPI specification, it is possible to have a maximum of 256 PCC subspace ids. Add support of multiple PCC subspace id instead of using a single global pcc_data structure. While at that fix the time_delta check in send_pcc_cmd() so that last_mpar_reset and mpar_count is initialized properly. Signed-off-by: George Cherian <george.cherian@cavium.com> --- drivers/acpi/cppc_acpi.c | 179 +++++++++++++++++++++++++---------------------- 1 file changed, 96 insertions(+), 83 deletions(-) diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c index 3ca0729..79c35b1 100644 --- a/drivers/acpi/cppc_acpi.c +++ b/drivers/acpi/cppc_acpi.c @@ -77,11 +77,10 @@ struct cppc_pcc_data { wait_queue_head_t pcc_write_wait_q; }; -/* Structure to represent the single PCC channel */ -static struct cppc_pcc_data pcc_data = { - .pcc_subspace_idx = -1, - .platform_owns_pcc = true, -}; +/* Array to represent the PCC channel per subspace id */ +static struct cppc_pcc_data pcc_data[MAX_PCC_SUBSPACES]; +/* The cpu_pcc_subspace_idx containsper CPU subspace id */ +static DEFINE_PER_CPU(int, cpu_pcc_subspace_idx); /* * The cpc_desc structure contains the ACPI register details @@ -93,7 +92,8 @@ static struct cppc_pcc_data pcc_data = { static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr); /* pcc mapped address + header size + offset within PCC subspace */ -#define GET_PCC_VADDR(offs) (pcc_data.pcc_comm_addr + 0x8 + (offs)) +#define GET_PCC_VADDR(offs, pcc_ss_id) (pcc_data[pcc_ss_id].pcc_comm_addr + \ + 0x8 + (offs)) /* Check if a CPC regsiter is in PCC */ #define CPC_IN_PCC(cpc) ((cpc)->type == ACPI_TYPE_BUFFER && \ @@ -183,13 +183,16 @@ static struct kobj_type cppc_ktype = { .default_attrs = cppc_attrs, }; -static int check_pcc_chan(bool chk_err_bit) +static int check_pcc_chan(int pcc_ss_id, bool chk_err_bit) { int ret = -EIO, status = 0; - struct acpi_pcct_shared_memory __iomem *generic_comm_base = pcc_data.pcc_comm_addr; - ktime_t next_deadline = ktime_add(ktime_get(), pcc_data.deadline); + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; + struct acpi_pcct_shared_memory __iomem *generic_comm_base = + pcc_ss_data->pcc_comm_addr; + ktime_t next_deadline = ktime_add(ktime_get(), + pcc_ss_data->deadline); - if (!pcc_data.platform_owns_pcc) + if (!pcc_ss_data->platform_owns_pcc) return 0; /* Retry in case the remote processor was too slow to catch up. */ @@ -214,7 +217,7 @@ static int check_pcc_chan(bool chk_err_bit) } if (likely(!ret)) - pcc_data.platform_owns_pcc = false; + pcc_ss_data->platform_owns_pcc = false; else pr_err("PCC check channel failed. Status=%x\n", status); @@ -225,11 +228,12 @@ static int check_pcc_chan(bool chk_err_bit) * This function transfers the ownership of the PCC to the platform * So it must be called while holding write_lock(pcc_lock) */ -static int send_pcc_cmd(u16 cmd) +static int send_pcc_cmd(int pcc_ss_id, u16 cmd) { int ret = -EIO, i; + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; struct acpi_pcct_shared_memory *generic_comm_base = - (struct acpi_pcct_shared_memory *) pcc_data.pcc_comm_addr; + (struct acpi_pcct_shared_memory *)pcc_ss_data->pcc_comm_addr; static ktime_t last_cmd_cmpl_time, last_mpar_reset; static int mpar_count; unsigned int time_delta; @@ -244,24 +248,24 @@ static int send_pcc_cmd(u16 cmd) * before write completion, so first send a WRITE command to * platform */ - if (pcc_data.pending_pcc_write_cmd) - send_pcc_cmd(CMD_WRITE); + if (pcc_ss_data->pending_pcc_write_cmd) + send_pcc_cmd(pcc_ss_id, CMD_WRITE); - ret = check_pcc_chan(false); + ret = check_pcc_chan(pcc_ss_id, false); if (ret) goto end; } else /* CMD_WRITE */ - pcc_data.pending_pcc_write_cmd = FALSE; + pcc_ss_data->pending_pcc_write_cmd = FALSE; /* * Handle the Minimum Request Turnaround Time(MRTT) * "The minimum amount of time that OSPM must wait after the completion * of a command before issuing the next command, in microseconds" */ - if (pcc_data.pcc_mrtt) { + if (pcc_ss_data->pcc_mrtt) { time_delta = ktime_us_delta(ktime_get(), last_cmd_cmpl_time); - if (pcc_data.pcc_mrtt > time_delta) - udelay(pcc_data.pcc_mrtt - time_delta); + if (pcc_ss_data->pcc_mrtt > time_delta) + udelay(pcc_ss_data->pcc_mrtt - time_delta); } /* @@ -275,16 +279,16 @@ static int send_pcc_cmd(u16 cmd) * not send the request to the platform after hitting the MPAR limit in * any 60s window */ - if (pcc_data.pcc_mpar) { + if (pcc_ss_data->pcc_mpar) { if (mpar_count == 0) { time_delta = ktime_ms_delta(ktime_get(), last_mpar_reset); - if (time_delta < 60 * MSEC_PER_SEC) { + if ((time_delta < 60 * MSEC_PER_SEC) && last_mpar_reset) { pr_debug("PCC cmd not sent due to MPAR limit"); ret = -EIO; goto end; } last_mpar_reset = ktime_get(); - mpar_count = pcc_data.pcc_mpar; + mpar_count = pcc_ss_data->pcc_mpar; } mpar_count--; } @@ -295,10 +299,10 @@ static int send_pcc_cmd(u16 cmd) /* Flip CMD COMPLETE bit */ writew_relaxed(0, &generic_comm_base->status); - pcc_data.platform_owns_pcc = true; + pcc_ss_data->platform_owns_pcc = true; /* Ring doorbell */ - ret = mbox_send_message(pcc_data.pcc_channel, &cmd); + ret = mbox_send_message(pcc_ss_data->pcc_channel, &cmd); if (ret < 0) { pr_err("Err sending PCC mbox message. cmd:%d, ret:%d\n", cmd, ret); @@ -306,15 +310,15 @@ static int send_pcc_cmd(u16 cmd) } /* wait for completion and check for PCC errro bit */ - ret = check_pcc_chan(true); + ret = check_pcc_chan(pcc_ss_id, true); - if (pcc_data.pcc_mrtt) + if (pcc_ss_data->pcc_mrtt) last_cmd_cmpl_time = ktime_get(); - if (pcc_data.pcc_channel->mbox->txdone_irq) - mbox_chan_txdone(pcc_data.pcc_channel, ret); + if (pcc_ss_data->pcc_channel->mbox->txdone_irq) + mbox_chan_txdone(pcc_ss_data->pcc_channel, ret); else - mbox_client_txdone(pcc_data.pcc_channel, ret); + mbox_client_txdone(pcc_ss_data->pcc_channel, ret); end: if (cmd == CMD_WRITE) { @@ -324,12 +328,12 @@ static int send_pcc_cmd(u16 cmd) if (!desc) continue; - if (desc->write_cmd_id == pcc_data.pcc_write_cnt) + if (desc->write_cmd_id == pcc_ss_data->pcc_write_cnt) desc->write_cmd_status = ret; } } - pcc_data.pcc_write_cnt++; - wake_up_all(&pcc_data.pcc_write_wait_q); + pcc_ss_data->pcc_write_cnt++; + wake_up_all(&pcc_ss_data->pcc_write_wait_q); } return ret; @@ -531,16 +535,16 @@ int acpi_get_psd_map(struct cppc_cpudata **all_cpu_data) } EXPORT_SYMBOL_GPL(acpi_get_psd_map); -static int register_pcc_channel(int pcc_subspace_idx) +static int register_pcc_channel(int pcc_ss_idx) { struct acpi_pcct_hw_reduced *cppc_ss; u64 usecs_lat; - if (pcc_subspace_idx >= 0) { - pcc_data.pcc_channel = pcc_mbox_request_channel(&cppc_mbox_cl, - pcc_subspace_idx); + if (pcc_ss_idx >= 0) { + pcc_data[pcc_ss_idx].pcc_channel = + pcc_mbox_request_channel(&cppc_mbox_cl, pcc_ss_idx); - if (IS_ERR(pcc_data.pcc_channel)) { + if (IS_ERR(pcc_data[pcc_ss_idx].pcc_channel)) { pr_err("Failed to find PCC communication channel\n"); return -ENODEV; } @@ -551,7 +555,7 @@ static int register_pcc_channel(int pcc_subspace_idx) * PCC channels) and stored pointers to the * subspace communication region in con_priv. */ - cppc_ss = (pcc_data.pcc_channel)->con_priv; + cppc_ss = (pcc_data[pcc_ss_idx].pcc_channel)->con_priv; if (!cppc_ss) { pr_err("No PCC subspace found for CPPC\n"); @@ -564,19 +568,20 @@ static int register_pcc_channel(int pcc_subspace_idx) * So add an arbitrary amount of wait on top of Nominal. */ usecs_lat = NUM_RETRIES * cppc_ss->latency; - pcc_data.deadline = ns_to_ktime(usecs_lat * NSEC_PER_USEC); - pcc_data.pcc_mrtt = cppc_ss->min_turnaround_time; - pcc_data.pcc_mpar = cppc_ss->max_access_rate; - pcc_data.pcc_nominal = cppc_ss->latency; - - pcc_data.pcc_comm_addr = acpi_os_ioremap(cppc_ss->base_address, cppc_ss->length); - if (!pcc_data.pcc_comm_addr) { + pcc_data[pcc_ss_idx].deadline = ns_to_ktime(usecs_lat * NSEC_PER_USEC); + pcc_data[pcc_ss_idx].pcc_mrtt = cppc_ss->min_turnaround_time; + pcc_data[pcc_ss_idx].pcc_mpar = cppc_ss->max_access_rate; + pcc_data[pcc_ss_idx].pcc_nominal = cppc_ss->latency; + + pcc_data[pcc_ss_idx].pcc_comm_addr = + acpi_os_ioremap(cppc_ss->base_address, cppc_ss->length); + if (!pcc_data[pcc_ss_idx].pcc_comm_addr) { pr_err("Failed to ioremap PCC comm region mem\n"); return -ENOMEM; } /* Set flag so that we dont come here for each CPU. */ - pcc_data.pcc_channel_acquired = true; + pcc_data[pcc_ss_idx].pcc_channel_acquired = true; } return 0; @@ -656,6 +661,7 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) struct device *cpu_dev; acpi_handle handle = pr->handle; unsigned int num_ent, i, cpc_rev; + unsigned int pcc_subspace_id = 0; acpi_status status; int ret = -EFAULT; @@ -728,12 +734,9 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) * so extract it only once. */ if (gas_t->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) { - if (pcc_data.pcc_subspace_idx < 0) - pcc_data.pcc_subspace_idx = gas_t->access_width; - else if (pcc_data.pcc_subspace_idx != gas_t->access_width) { - pr_debug("Mismatched PCC ids.\n"); - goto out_free; - } + pcc_subspace_id = gas_t->access_width; + pcc_data[pcc_subspace_id].pcc_subspace_idx = gas_t->access_width; + per_cpu(cpu_pcc_subspace_idx, pr->id) = gas_t->access_width; } else if (gas_t->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { if (gas_t->address) { void __iomem *addr; @@ -766,14 +769,14 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) if (ret) goto out_free; - /* Register PCC channel once for all CPUs. */ - if (!pcc_data.pcc_channel_acquired) { - ret = register_pcc_channel(pcc_data.pcc_subspace_idx); + /* Register PCC channel once for all PCC subspace id. */ + if (!pcc_data[pcc_subspace_id].pcc_channel_acquired) { + ret = register_pcc_channel(pcc_data[pcc_subspace_id].pcc_subspace_idx); if (ret) goto out_free; - init_rwsem(&pcc_data.pcc_lock); - init_waitqueue_head(&pcc_data.pcc_write_wait_q); + init_rwsem(&pcc_data[pcc_subspace_id].pcc_lock); + init_waitqueue_head(&pcc_data[pcc_subspace_id].pcc_write_wait_q); } /* Everything looks okay */ @@ -883,6 +886,7 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val) { int ret_val = 0; void __iomem *vaddr = 0; + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); struct cpc_reg *reg = ®_res->cpc_entry.reg; if (reg_res->type == ACPI_TYPE_INTEGER) { @@ -892,7 +896,7 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val) *val = 0; if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) - vaddr = GET_PCC_VADDR(reg->address); + vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id); else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) vaddr = reg_res->sys_mem_vaddr; else if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) @@ -927,10 +931,11 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) { int ret_val = 0; void __iomem *vaddr = 0; + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); struct cpc_reg *reg = ®_res->cpc_entry.reg; if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) - vaddr = GET_PCC_VADDR(reg->address); + vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id); else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) vaddr = reg_res->sys_mem_vaddr; else if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) @@ -974,6 +979,8 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); struct cpc_register_resource *highest_reg, *lowest_reg, *ref_perf, *nom_perf; + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum); + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; u64 high, low, nom; int ret = 0, regs_in_pcc = 0; @@ -991,9 +998,9 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) if (CPC_IN_PCC(highest_reg) || CPC_IN_PCC(lowest_reg) || CPC_IN_PCC(ref_perf) || CPC_IN_PCC(nom_perf)) { regs_in_pcc = 1; - down_write(&pcc_data.pcc_lock); + down_write(&pcc_ss_data->pcc_lock); /* Ring doorbell once to update PCC subspace */ - if (send_pcc_cmd(CMD_READ) < 0) { + if (send_pcc_cmd(pcc_ss_id, CMD_READ) < 0) { ret = -EIO; goto out_err; } @@ -1013,7 +1020,7 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) out_err: if (regs_in_pcc) - up_write(&pcc_data.pcc_lock); + up_write(&pcc_ss_data->pcc_lock); return ret; } EXPORT_SYMBOL_GPL(cppc_get_perf_caps); @@ -1030,6 +1037,8 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); struct cpc_register_resource *delivered_reg, *reference_reg, *ref_perf_reg, *ctr_wrap_reg; + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum); + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; u64 delivered, reference, ref_perf, ctr_wrap_time; int ret = 0, regs_in_pcc = 0; @@ -1053,10 +1062,10 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) /* Are any of the regs PCC ?*/ if (CPC_IN_PCC(delivered_reg) || CPC_IN_PCC(reference_reg) || CPC_IN_PCC(ctr_wrap_reg) || CPC_IN_PCC(ref_perf_reg)) { - down_write(&pcc_data.pcc_lock); + down_write(&pcc_ss_data->pcc_lock); regs_in_pcc = 1; /* Ring doorbell once to update PCC subspace */ - if (send_pcc_cmd(CMD_READ) < 0) { + if (send_pcc_cmd(pcc_ss_id, CMD_READ) < 0) { ret = -EIO; goto out_err; } @@ -1086,7 +1095,7 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) perf_fb_ctrs->ctr_wrap_time = ctr_wrap_time; out_err: if (regs_in_pcc) - up_write(&pcc_data.pcc_lock); + up_write(&pcc_ss_data->pcc_lock); return ret; } EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs); @@ -1102,6 +1111,8 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) { struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu); struct cpc_register_resource *desired_reg; + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; int ret = 0; if (!cpc_desc) { @@ -1119,11 +1130,11 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) * achieve that goal here */ if (CPC_IN_PCC(desired_reg)) { - down_read(&pcc_data.pcc_lock); /* BEGIN Phase-I */ - if (pcc_data.platform_owns_pcc) { - ret = check_pcc_chan(false); + down_read(&pcc_ss_data->pcc_lock); /* BEGIN Phase-I */ + if (pcc_ss_data->platform_owns_pcc) { + ret = check_pcc_chan(pcc_ss_id, false); if (ret) { - up_read(&pcc_data.pcc_lock); + up_read(&pcc_ss_data->pcc_lock); return ret; } } @@ -1131,8 +1142,8 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) * Update the pending_write to make sure a PCC CMD_READ will not * arrive and steal the channel during the switch to write lock */ - pcc_data.pending_pcc_write_cmd = true; - cpc_desc->write_cmd_id = pcc_data.pcc_write_cnt; + pcc_ss_data->pending_pcc_write_cmd = true; + cpc_desc->write_cmd_id = pcc_ss_data->pcc_write_cnt; cpc_desc->write_cmd_status = 0; } @@ -1143,7 +1154,7 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) cpc_write(cpu, desired_reg, perf_ctrls->desired_perf); if (CPC_IN_PCC(desired_reg)) - up_read(&pcc_data.pcc_lock); /* END Phase-I */ + up_read(&pcc_ss_data->pcc_lock); /* END Phase-I */ /* * This is Phase-II where we transfer the ownership of PCC to Platform * @@ -1191,15 +1202,15 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) * the write command before servicing the read command */ if (CPC_IN_PCC(desired_reg)) { - if (down_write_trylock(&pcc_data.pcc_lock)) { /* BEGIN Phase-II */ + if (down_write_trylock(&pcc_ss_data->pcc_lock)) {/* BEGIN Phase-II */ /* Update only if there are pending write commands */ - if (pcc_data.pending_pcc_write_cmd) - send_pcc_cmd(CMD_WRITE); - up_write(&pcc_data.pcc_lock); /* END Phase-II */ + if (pcc_ss_data->pending_pcc_write_cmd) + send_pcc_cmd(pcc_ss_id, CMD_WRITE); + up_write(&pcc_ss_data->pcc_lock); /* END Phase-II */ } else /* Wait until pcc_write_cnt is updated by send_pcc_cmd */ - wait_event(pcc_data.pcc_write_wait_q, - cpc_desc->write_cmd_id != pcc_data.pcc_write_cnt); + wait_event(pcc_ss_data->pcc_write_wait_q, + cpc_desc->write_cmd_id != pcc_ss_data->pcc_write_cnt); /* send_pcc_cmd updates the status in case of failure */ ret = cpc_desc->write_cmd_status; @@ -1232,6 +1243,8 @@ unsigned int cppc_get_transition_latency(int cpu_num) unsigned int latency_ns = 0; struct cpc_desc *cpc_desc; struct cpc_register_resource *desired_reg; + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu_num); + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; cpc_desc = per_cpu(cpc_desc_ptr, cpu_num); if (!cpc_desc) @@ -1241,11 +1254,11 @@ unsigned int cppc_get_transition_latency(int cpu_num) if (!CPC_IN_PCC(desired_reg)) return CPUFREQ_ETERNAL; - if (pcc_data.pcc_mpar) - latency_ns = 60 * (1000 * 1000 * 1000 / pcc_data.pcc_mpar); + if (pcc_ss_data->pcc_mpar) + latency_ns = 60 * (1000 * 1000 * 1000 / pcc_ss_data->pcc_mpar); - latency_ns = max(latency_ns, pcc_data.pcc_nominal * 1000); - latency_ns = max(latency_ns, pcc_data.pcc_mrtt * 1000); + latency_ns = max(latency_ns, pcc_ss_data->pcc_nominal * 1000); + latency_ns = max(latency_ns, pcc_ss_data->pcc_mrtt * 1000); return latency_ns; } -- 2.7.4 ^ permalink raw reply related [flat|nested] 11+ messages in thread
* Re: [PATCH 2/2] ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids 2017-06-13 14:17 ` [PATCH 2/2] ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids George Cherian @ 2017-07-13 21:44 ` Prakash, Prashanth 2017-07-14 11:02 ` George Cherian 0 siblings, 1 reply; 11+ messages in thread From: Prakash, Prashanth @ 2017-07-13 21:44 UTC (permalink / raw) To: George Cherian, linux-acpi, linux-kernel, devel Cc: rjw, lenb, jassisinghbrar, robert.moore, lv.zheng Hi George, On 6/13/2017 8:17 AM, George Cherian wrote: > Based on ACPI 6.2 Section 8.4.7.1.9 If the PCC register space is used, > all PCC registers, for all processors in the same performance > domain (as defined by _PSD), must be defined to be in the same subspace. > Based on Section 14.1 of ACPI specification, it is possible to have a > maximum of 256 PCC subspace ids. Add support of multiple PCC subspace id > instead of using a single global pcc_data structure. > > While at that fix the time_delta check in send_pcc_cmd() so that last_mpar_reset > and mpar_count is initialized properly. > > Signed-off-by: George Cherian <george.cherian@cavium.com> > --- > drivers/acpi/cppc_acpi.c | 179 +++++++++++++++++++++++++---------------------- > 1 file changed, 96 insertions(+), 83 deletions(-) > > diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c > index 3ca0729..79c35b1 100644 > --- a/drivers/acpi/cppc_acpi.c > +++ b/drivers/acpi/cppc_acpi.c > @@ -77,11 +77,10 @@ struct cppc_pcc_data { > wait_queue_head_t pcc_write_wait_q; > }; > > -/* Structure to represent the single PCC channel */ > -static struct cppc_pcc_data pcc_data = { > - .pcc_subspace_idx = -1, > - .platform_owns_pcc = true, > -}; > +/* Array to represent the PCC channel per subspace id */ > +static struct cppc_pcc_data pcc_data[MAX_PCC_SUBSPACES]; It is unlikely we will end up using all 256 PCC subspaces, so can we please make it a an array(size=MAX_PCC_SUBSPACES) of cppc_pcc_data pointers. We can dynamically allocate the cppc_pcc_data structures and maintain their references in this array. > +/* The cpu_pcc_subspace_idx containsper CPU subspace id */ > +static DEFINE_PER_CPU(int, cpu_pcc_subspace_idx); > > /* > * The cpc_desc structure contains the ACPI register details > @@ -93,7 +92,8 @@ static struct cppc_pcc_data pcc_data = { > static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr); > > /* pcc mapped address + header size + offset within PCC subspace */ > -#define GET_PCC_VADDR(offs) (pcc_data.pcc_comm_addr + 0x8 + (offs)) > +#define GET_PCC_VADDR(offs, pcc_ss_id) (pcc_data[pcc_ss_id].pcc_comm_addr + \ > + 0x8 + (offs)) > > /* Check if a CPC regsiter is in PCC */ > #define CPC_IN_PCC(cpc) ((cpc)->type == ACPI_TYPE_BUFFER && \ > @@ -183,13 +183,16 @@ static struct kobj_type cppc_ktype = { > .default_attrs = cppc_attrs, > }; > > -static int check_pcc_chan(bool chk_err_bit) > +static int check_pcc_chan(int pcc_ss_id, bool chk_err_bit) > { > int ret = -EIO, status = 0; > - struct acpi_pcct_shared_memory __iomem *generic_comm_base = pcc_data.pcc_comm_addr; > - ktime_t next_deadline = ktime_add(ktime_get(), pcc_data.deadline); > + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; > + struct acpi_pcct_shared_memory __iomem *generic_comm_base = > + pcc_ss_data->pcc_comm_addr; > + ktime_t next_deadline = ktime_add(ktime_get(), > + pcc_ss_data->deadline); > > - if (!pcc_data.platform_owns_pcc) > + if (!pcc_ss_data->platform_owns_pcc) > return 0; > > /* Retry in case the remote processor was too slow to catch up. */ > @@ -214,7 +217,7 @@ static int check_pcc_chan(bool chk_err_bit) > } > > if (likely(!ret)) > - pcc_data.platform_owns_pcc = false; > + pcc_ss_data->platform_owns_pcc = false; > else > pr_err("PCC check channel failed. Status=%x\n", status); > > @@ -225,11 +228,12 @@ static int check_pcc_chan(bool chk_err_bit) > * This function transfers the ownership of the PCC to the platform > * So it must be called while holding write_lock(pcc_lock) > */ > -static int send_pcc_cmd(u16 cmd) > +static int send_pcc_cmd(int pcc_ss_id, u16 cmd) > { > int ret = -EIO, i; > + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; > struct acpi_pcct_shared_memory *generic_comm_base = > - (struct acpi_pcct_shared_memory *) pcc_data.pcc_comm_addr; > + (struct acpi_pcct_shared_memory *)pcc_ss_data->pcc_comm_addr; > static ktime_t last_cmd_cmpl_time, last_mpar_reset; > static int mpar_count; Since we had only one PCC channel until ACPI6.1, it was ok to maintain these (mpar_count, last_cmd_cmpl_time, last_mpar_reset) here as static variables. Now that we are supporting multiple PCC subspaces these should be maintained per PCC subspaces. Can you please move these over to the cppc_pcc_data? > unsigned int time_delta; > @@ -244,24 +248,24 @@ static int send_pcc_cmd(u16 cmd) > * before write completion, so first send a WRITE command to > * platform > */ > - if (pcc_data.pending_pcc_write_cmd) > - send_pcc_cmd(CMD_WRITE); > + if (pcc_ss_data->pending_pcc_write_cmd) > + send_pcc_cmd(pcc_ss_id, CMD_WRITE); > > - ret = check_pcc_chan(false); > + ret = check_pcc_chan(pcc_ss_id, false); > if (ret) > goto end; > } else /* CMD_WRITE */ > - pcc_data.pending_pcc_write_cmd = FALSE; > + pcc_ss_data->pending_pcc_write_cmd = FALSE; > > /* > * Handle the Minimum Request Turnaround Time(MRTT) > * "The minimum amount of time that OSPM must wait after the completion > * of a command before issuing the next command, in microseconds" > */ > - if (pcc_data.pcc_mrtt) { > + if (pcc_ss_data->pcc_mrtt) { > time_delta = ktime_us_delta(ktime_get(), last_cmd_cmpl_time); > - if (pcc_data.pcc_mrtt > time_delta) > - udelay(pcc_data.pcc_mrtt - time_delta); > + if (pcc_ss_data->pcc_mrtt > time_delta) > + udelay(pcc_ss_data->pcc_mrtt - time_delta); > } > > /* > @@ -275,16 +279,16 @@ static int send_pcc_cmd(u16 cmd) > * not send the request to the platform after hitting the MPAR limit in > * any 60s window > */ > - if (pcc_data.pcc_mpar) { > + if (pcc_ss_data->pcc_mpar) { > if (mpar_count == 0) { > time_delta = ktime_ms_delta(ktime_get(), last_mpar_reset); > - if (time_delta < 60 * MSEC_PER_SEC) { > + if ((time_delta < 60 * MSEC_PER_SEC) && last_mpar_reset) { > pr_debug("PCC cmd not sent due to MPAR limit"); > ret = -EIO; > goto end; > } > last_mpar_reset = ktime_get(); > - mpar_count = pcc_data.pcc_mpar; > + mpar_count = pcc_ss_data->pcc_mpar; > } > mpar_count--; > } The above mpar and mrtt checks should be modified to use per subspace variables. > @@ -295,10 +299,10 @@ static int send_pcc_cmd(u16 cmd) > /* Flip CMD COMPLETE bit */ > writew_relaxed(0, &generic_comm_base->status); > > - pcc_data.platform_owns_pcc = true; > + pcc_ss_data->platform_owns_pcc = true; > > /* Ring doorbell */ > - ret = mbox_send_message(pcc_data.pcc_channel, &cmd); > + ret = mbox_send_message(pcc_ss_data->pcc_channel, &cmd); > if (ret < 0) { > pr_err("Err sending PCC mbox message. cmd:%d, ret:%d\n", > cmd, ret); > @@ -306,15 +310,15 @@ static int send_pcc_cmd(u16 cmd) > } > > /* wait for completion and check for PCC errro bit */ > - ret = check_pcc_chan(true); > + ret = check_pcc_chan(pcc_ss_id, true); > > - if (pcc_data.pcc_mrtt) > + if (pcc_ss_data->pcc_mrtt) > last_cmd_cmpl_time = ktime_get(); > > - if (pcc_data.pcc_channel->mbox->txdone_irq) > - mbox_chan_txdone(pcc_data.pcc_channel, ret); > + if (pcc_ss_data->pcc_channel->mbox->txdone_irq) > + mbox_chan_txdone(pcc_ss_data->pcc_channel, ret); > else > - mbox_client_txdone(pcc_data.pcc_channel, ret); > + mbox_client_txdone(pcc_ss_data->pcc_channel, ret); > > end: > if (cmd == CMD_WRITE) { > @@ -324,12 +328,12 @@ static int send_pcc_cmd(u16 cmd) > if (!desc) > continue; > > - if (desc->write_cmd_id == pcc_data.pcc_write_cnt) > + if (desc->write_cmd_id == pcc_ss_data->pcc_write_cnt) > desc->write_cmd_status = ret; > } > } > - pcc_data.pcc_write_cnt++; > - wake_up_all(&pcc_data.pcc_write_wait_q); > + pcc_ss_data->pcc_write_cnt++; > + wake_up_all(&pcc_ss_data->pcc_write_wait_q); > } > > return ret; > @@ -531,16 +535,16 @@ int acpi_get_psd_map(struct cppc_cpudata **all_cpu_data) > } > EXPORT_SYMBOL_GPL(acpi_get_psd_map); > > -static int register_pcc_channel(int pcc_subspace_idx) > +static int register_pcc_channel(int pcc_ss_idx) > { > struct acpi_pcct_hw_reduced *cppc_ss; > u64 usecs_lat; > > - if (pcc_subspace_idx >= 0) { > - pcc_data.pcc_channel = pcc_mbox_request_channel(&cppc_mbox_cl, > - pcc_subspace_idx); > + if (pcc_ss_idx >= 0) { > + pcc_data[pcc_ss_idx].pcc_channel = > + pcc_mbox_request_channel(&cppc_mbox_cl, pcc_ss_idx); > > - if (IS_ERR(pcc_data.pcc_channel)) { > + if (IS_ERR(pcc_data[pcc_ss_idx].pcc_channel)) { > pr_err("Failed to find PCC communication channel\n"); > return -ENODEV; > } > @@ -551,7 +555,7 @@ static int register_pcc_channel(int pcc_subspace_idx) > * PCC channels) and stored pointers to the > * subspace communication region in con_priv. > */ > - cppc_ss = (pcc_data.pcc_channel)->con_priv; > + cppc_ss = (pcc_data[pcc_ss_idx].pcc_channel)->con_priv; > > if (!cppc_ss) { > pr_err("No PCC subspace found for CPPC\n"); > @@ -564,19 +568,20 @@ static int register_pcc_channel(int pcc_subspace_idx) > * So add an arbitrary amount of wait on top of Nominal. > */ > usecs_lat = NUM_RETRIES * cppc_ss->latency; > - pcc_data.deadline = ns_to_ktime(usecs_lat * NSEC_PER_USEC); > - pcc_data.pcc_mrtt = cppc_ss->min_turnaround_time; > - pcc_data.pcc_mpar = cppc_ss->max_access_rate; > - pcc_data.pcc_nominal = cppc_ss->latency; > - > - pcc_data.pcc_comm_addr = acpi_os_ioremap(cppc_ss->base_address, cppc_ss->length); > - if (!pcc_data.pcc_comm_addr) { > + pcc_data[pcc_ss_idx].deadline = ns_to_ktime(usecs_lat * NSEC_PER_USEC); > + pcc_data[pcc_ss_idx].pcc_mrtt = cppc_ss->min_turnaround_time; > + pcc_data[pcc_ss_idx].pcc_mpar = cppc_ss->max_access_rate; > + pcc_data[pcc_ss_idx].pcc_nominal = cppc_ss->latency; > + > + pcc_data[pcc_ss_idx].pcc_comm_addr = > + acpi_os_ioremap(cppc_ss->base_address, cppc_ss->length); > + if (!pcc_data[pcc_ss_idx].pcc_comm_addr) { > pr_err("Failed to ioremap PCC comm region mem\n"); > return -ENOMEM; > } > > /* Set flag so that we dont come here for each CPU. */ > - pcc_data.pcc_channel_acquired = true; > + pcc_data[pcc_ss_idx].pcc_channel_acquired = true; > } > > return 0; > @@ -656,6 +661,7 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) > struct device *cpu_dev; > acpi_handle handle = pr->handle; > unsigned int num_ent, i, cpc_rev; > + unsigned int pcc_subspace_id = 0; > acpi_status status; > int ret = -EFAULT; > > @@ -728,12 +734,9 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) > * so extract it only once. > */ > if (gas_t->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) { > - if (pcc_data.pcc_subspace_idx < 0) > - pcc_data.pcc_subspace_idx = gas_t->access_width; > - else if (pcc_data.pcc_subspace_idx != gas_t->access_width) { > - pr_debug("Mismatched PCC ids.\n"); > - goto out_free; > - } > + pcc_subspace_id = gas_t->access_width; > + pcc_data[pcc_subspace_id].pcc_subspace_idx = gas_t->access_width; > + per_cpu(cpu_pcc_subspace_idx, pr->id) = gas_t->access_width; pcc_data[pcc_subspace_id].pcc_subspace_idx = pcc_subspace_id; per_cpu(cpu_pcc_subspace_idx, pr->id) = pcc_subspace_id; I don't see a need for pcc_subspace_idx to be in struct cppc_pcc_data anymore. If you agree, may be we can remove it. > } else if (gas_t->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { > if (gas_t->address) { > void __iomem *addr; > @@ -766,14 +769,14 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) > if (ret) > goto out_free; > > - /* Register PCC channel once for all CPUs. */ > - if (!pcc_data.pcc_channel_acquired) { > - ret = register_pcc_channel(pcc_data.pcc_subspace_idx); > + /* Register PCC channel once for all PCC subspace id. */ > + if (!pcc_data[pcc_subspace_id].pcc_channel_acquired) { Looks like we assume a PCC subspace is always present and looking at the 6.2 spec it doesn't look like a mandatory requirement. So, the correct check here should be: if (pcc_subspace_id is valid && !pcc_data[pcc_subspace_id].pcc_channel_acquired) We need to make sure pcc_subspace_id is set to an invalid value until we find a valid PCC subspace within the _CPC package. You can correct this in next version or I can submit a small patch. > + ret = register_pcc_channel(pcc_data[pcc_subspace_id].pcc_subspace_idx); > if (ret) > goto out_free; > > - init_rwsem(&pcc_data.pcc_lock); > - init_waitqueue_head(&pcc_data.pcc_write_wait_q); > + init_rwsem(&pcc_data[pcc_subspace_id].pcc_lock); > + init_waitqueue_head(&pcc_data[pcc_subspace_id].pcc_write_wait_q); > } > > /* Everything looks okay */ > @@ -883,6 +886,7 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val) > { > int ret_val = 0; > void __iomem *vaddr = 0; > + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); > struct cpc_reg *reg = ®_res->cpc_entry.reg; > > if (reg_res->type == ACPI_TYPE_INTEGER) { > @@ -892,7 +896,7 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val) > > *val = 0; > if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) > - vaddr = GET_PCC_VADDR(reg->address); > + vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id); > else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) > vaddr = reg_res->sys_mem_vaddr; > else if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) > @@ -927,10 +931,11 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) > { > int ret_val = 0; > void __iomem *vaddr = 0; > + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); > struct cpc_reg *reg = ®_res->cpc_entry.reg; > > if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) > - vaddr = GET_PCC_VADDR(reg->address); > + vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id); > else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) > vaddr = reg_res->sys_mem_vaddr; > else if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) > @@ -974,6 +979,8 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) > struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); > struct cpc_register_resource *highest_reg, *lowest_reg, *ref_perf, > *nom_perf; > + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum); > + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; > u64 high, low, nom; > int ret = 0, regs_in_pcc = 0; > > @@ -991,9 +998,9 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) > if (CPC_IN_PCC(highest_reg) || CPC_IN_PCC(lowest_reg) || > CPC_IN_PCC(ref_perf) || CPC_IN_PCC(nom_perf)) { > regs_in_pcc = 1; > - down_write(&pcc_data.pcc_lock); > + down_write(&pcc_ss_data->pcc_lock); > /* Ring doorbell once to update PCC subspace */ > - if (send_pcc_cmd(CMD_READ) < 0) { > + if (send_pcc_cmd(pcc_ss_id, CMD_READ) < 0) { > ret = -EIO; > goto out_err; > } > @@ -1013,7 +1020,7 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) > > out_err: > if (regs_in_pcc) > - up_write(&pcc_data.pcc_lock); > + up_write(&pcc_ss_data->pcc_lock); > return ret; > } > EXPORT_SYMBOL_GPL(cppc_get_perf_caps); > @@ -1030,6 +1037,8 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) > struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); > struct cpc_register_resource *delivered_reg, *reference_reg, > *ref_perf_reg, *ctr_wrap_reg; > + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum); > + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; > u64 delivered, reference, ref_perf, ctr_wrap_time; > int ret = 0, regs_in_pcc = 0; > > @@ -1053,10 +1062,10 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) > /* Are any of the regs PCC ?*/ > if (CPC_IN_PCC(delivered_reg) || CPC_IN_PCC(reference_reg) || > CPC_IN_PCC(ctr_wrap_reg) || CPC_IN_PCC(ref_perf_reg)) { > - down_write(&pcc_data.pcc_lock); > + down_write(&pcc_ss_data->pcc_lock); > regs_in_pcc = 1; > /* Ring doorbell once to update PCC subspace */ > - if (send_pcc_cmd(CMD_READ) < 0) { > + if (send_pcc_cmd(pcc_ss_id, CMD_READ) < 0) { > ret = -EIO; > goto out_err; > } > @@ -1086,7 +1095,7 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) > perf_fb_ctrs->ctr_wrap_time = ctr_wrap_time; > out_err: > if (regs_in_pcc) > - up_write(&pcc_data.pcc_lock); > + up_write(&pcc_ss_data->pcc_lock); > return ret; > } > EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs); > @@ -1102,6 +1111,8 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) > { > struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu); > struct cpc_register_resource *desired_reg; > + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); > + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; > int ret = 0; > > if (!cpc_desc) { > @@ -1119,11 +1130,11 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) > * achieve that goal here > */ > if (CPC_IN_PCC(desired_reg)) { > - down_read(&pcc_data.pcc_lock); /* BEGIN Phase-I */ > - if (pcc_data.platform_owns_pcc) { > - ret = check_pcc_chan(false); > + down_read(&pcc_ss_data->pcc_lock); /* BEGIN Phase-I */ > + if (pcc_ss_data->platform_owns_pcc) { > + ret = check_pcc_chan(pcc_ss_id, false); > if (ret) { > - up_read(&pcc_data.pcc_lock); > + up_read(&pcc_ss_data->pcc_lock); > return ret; > } > } > @@ -1131,8 +1142,8 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) > * Update the pending_write to make sure a PCC CMD_READ will not > * arrive and steal the channel during the switch to write lock > */ > - pcc_data.pending_pcc_write_cmd = true; > - cpc_desc->write_cmd_id = pcc_data.pcc_write_cnt; > + pcc_ss_data->pending_pcc_write_cmd = true; > + cpc_desc->write_cmd_id = pcc_ss_data->pcc_write_cnt; > cpc_desc->write_cmd_status = 0; > } > > @@ -1143,7 +1154,7 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) > cpc_write(cpu, desired_reg, perf_ctrls->desired_perf); > > if (CPC_IN_PCC(desired_reg)) > - up_read(&pcc_data.pcc_lock); /* END Phase-I */ > + up_read(&pcc_ss_data->pcc_lock); /* END Phase-I */ > /* > * This is Phase-II where we transfer the ownership of PCC to Platform > * > @@ -1191,15 +1202,15 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) > * the write command before servicing the read command > */ > if (CPC_IN_PCC(desired_reg)) { > - if (down_write_trylock(&pcc_data.pcc_lock)) { /* BEGIN Phase-II */ > + if (down_write_trylock(&pcc_ss_data->pcc_lock)) {/* BEGIN Phase-II */ > /* Update only if there are pending write commands */ > - if (pcc_data.pending_pcc_write_cmd) > - send_pcc_cmd(CMD_WRITE); > - up_write(&pcc_data.pcc_lock); /* END Phase-II */ > + if (pcc_ss_data->pending_pcc_write_cmd) > + send_pcc_cmd(pcc_ss_id, CMD_WRITE); > + up_write(&pcc_ss_data->pcc_lock); /* END Phase-II */ > } else > /* Wait until pcc_write_cnt is updated by send_pcc_cmd */ > - wait_event(pcc_data.pcc_write_wait_q, > - cpc_desc->write_cmd_id != pcc_data.pcc_write_cnt); > + wait_event(pcc_ss_data->pcc_write_wait_q, > + cpc_desc->write_cmd_id != pcc_ss_data->pcc_write_cnt); > > /* send_pcc_cmd updates the status in case of failure */ > ret = cpc_desc->write_cmd_status; > @@ -1232,6 +1243,8 @@ unsigned int cppc_get_transition_latency(int cpu_num) > unsigned int latency_ns = 0; > struct cpc_desc *cpc_desc; > struct cpc_register_resource *desired_reg; > + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu_num); > + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; > > cpc_desc = per_cpu(cpc_desc_ptr, cpu_num); > if (!cpc_desc) > @@ -1241,11 +1254,11 @@ unsigned int cppc_get_transition_latency(int cpu_num) > if (!CPC_IN_PCC(desired_reg)) > return CPUFREQ_ETERNAL; > > - if (pcc_data.pcc_mpar) > - latency_ns = 60 * (1000 * 1000 * 1000 / pcc_data.pcc_mpar); > + if (pcc_ss_data->pcc_mpar) > + latency_ns = 60 * (1000 * 1000 * 1000 / pcc_ss_data->pcc_mpar); > > - latency_ns = max(latency_ns, pcc_data.pcc_nominal * 1000); > - latency_ns = max(latency_ns, pcc_data.pcc_mrtt * 1000); > + latency_ns = max(latency_ns, pcc_ss_data->pcc_nominal * 1000); > + latency_ns = max(latency_ns, pcc_ss_data->pcc_mrtt * 1000); > > return latency_ns; > } When you send the next version with updates, can you please add a version to the patches ex: [PATCH v2 2/2]? I think this series is v2, as it addresses some of Alexey's comments on the initial version. -- Thanks, Prashanth ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 2/2] ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids 2017-07-13 21:44 ` Prakash, Prashanth @ 2017-07-14 11:02 ` George Cherian 0 siblings, 0 replies; 11+ messages in thread From: George Cherian @ 2017-07-14 11:02 UTC (permalink / raw) To: Prakash, Prashanth, George Cherian, linux-acpi, linux-kernel, devel Cc: rjw, lenb, jassisinghbrar, robert.moore, lv.zheng Hi Prashanth, Thanks for the review. On 07/14/2017 03:14 AM, Prakash, Prashanth wrote: > Hi George, > > On 6/13/2017 8:17 AM, George Cherian wrote: >> Based on ACPI 6.2 Section 8.4.7.1.9 If the PCC register space is used, >> all PCC registers, for all processors in the same performance >> domain (as defined by _PSD), must be defined to be in the same subspace. >> Based on Section 14.1 of ACPI specification, it is possible to have a >> maximum of 256 PCC subspace ids. Add support of multiple PCC subspace id >> instead of using a single global pcc_data structure. >> >> While at that fix the time_delta check in send_pcc_cmd() so that last_mpar_reset >> and mpar_count is initialized properly. >> >> Signed-off-by: George Cherian <george.cherian@cavium.com> >> --- >> drivers/acpi/cppc_acpi.c | 179 +++++++++++++++++++++++++---------------------- >> 1 file changed, 96 insertions(+), 83 deletions(-) >> >> diff --git a/drivers/acpi/cppc_acpi.c b/drivers/acpi/cppc_acpi.c >> index 3ca0729..79c35b1 100644 >> --- a/drivers/acpi/cppc_acpi.c >> +++ b/drivers/acpi/cppc_acpi.c >> @@ -77,11 +77,10 @@ struct cppc_pcc_data { >> wait_queue_head_t pcc_write_wait_q; >> }; >> >> -/* Structure to represent the single PCC channel */ >> -static struct cppc_pcc_data pcc_data = { >> - .pcc_subspace_idx = -1, >> - .platform_owns_pcc = true, >> -}; >> +/* Array to represent the PCC channel per subspace id */ >> +static struct cppc_pcc_data pcc_data[MAX_PCC_SUBSPACES]; > It is unlikely we will end up using all 256 PCC subspaces, so can we > please make it a an array(size=MAX_PCC_SUBSPACES) of cppc_pcc_data > pointers. We can dynamically allocate the cppc_pcc_data structures and > maintain their references in this array. Yes, I will do that in next version. >> +/* The cpu_pcc_subspace_idx containsper CPU subspace id */ >> +static DEFINE_PER_CPU(int, cpu_pcc_subspace_idx); >> >> /* >> * The cpc_desc structure contains the ACPI register details >> @@ -93,7 +92,8 @@ static struct cppc_pcc_data pcc_data = { >> static DEFINE_PER_CPU(struct cpc_desc *, cpc_desc_ptr); >> >> /* pcc mapped address + header size + offset within PCC subspace */ >> -#define GET_PCC_VADDR(offs) (pcc_data.pcc_comm_addr + 0x8 + (offs)) >> +#define GET_PCC_VADDR(offs, pcc_ss_id) (pcc_data[pcc_ss_id].pcc_comm_addr + \ >> + 0x8 + (offs)) >> >> /* Check if a CPC regsiter is in PCC */ >> #define CPC_IN_PCC(cpc) ((cpc)->type == ACPI_TYPE_BUFFER && \ >> @@ -183,13 +183,16 @@ static struct kobj_type cppc_ktype = { >> .default_attrs = cppc_attrs, >> }; >> >> -static int check_pcc_chan(bool chk_err_bit) >> +static int check_pcc_chan(int pcc_ss_id, bool chk_err_bit) >> { >> int ret = -EIO, status = 0; >> - struct acpi_pcct_shared_memory __iomem *generic_comm_base = pcc_data.pcc_comm_addr; >> - ktime_t next_deadline = ktime_add(ktime_get(), pcc_data.deadline); >> + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; >> + struct acpi_pcct_shared_memory __iomem *generic_comm_base = >> + pcc_ss_data->pcc_comm_addr; >> + ktime_t next_deadline = ktime_add(ktime_get(), >> + pcc_ss_data->deadline); >> >> - if (!pcc_data.platform_owns_pcc) >> + if (!pcc_ss_data->platform_owns_pcc) >> return 0; >> >> /* Retry in case the remote processor was too slow to catch up. */ >> @@ -214,7 +217,7 @@ static int check_pcc_chan(bool chk_err_bit) >> } >> >> if (likely(!ret)) >> - pcc_data.platform_owns_pcc = false; >> + pcc_ss_data->platform_owns_pcc = false; >> else >> pr_err("PCC check channel failed. Status=%x\n", status); >> >> @@ -225,11 +228,12 @@ static int check_pcc_chan(bool chk_err_bit) >> * This function transfers the ownership of the PCC to the platform >> * So it must be called while holding write_lock(pcc_lock) >> */ >> -static int send_pcc_cmd(u16 cmd) >> +static int send_pcc_cmd(int pcc_ss_id, u16 cmd) >> { >> int ret = -EIO, i; >> + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; >> struct acpi_pcct_shared_memory *generic_comm_base = >> - (struct acpi_pcct_shared_memory *) pcc_data.pcc_comm_addr; >> + (struct acpi_pcct_shared_memory *)pcc_ss_data->pcc_comm_addr; >> static ktime_t last_cmd_cmpl_time, last_mpar_reset; >> static int mpar_count; > Since we had only one PCC channel until ACPI6.1, it was ok to maintain > these (mpar_count, last_cmd_cmpl_time, last_mpar_reset) here as static > variables. > Now that we are supporting multiple PCC subspaces these should be > maintained per PCC subspaces. Can you please move these over to the > cppc_pcc_data? Yes I will move these to be maintained as per subspace. >> unsigned int time_delta; >> @@ -244,24 +248,24 @@ static int send_pcc_cmd(u16 cmd) >> * before write completion, so first send a WRITE command to >> * platform >> */ >> - if (pcc_data.pending_pcc_write_cmd) >> - send_pcc_cmd(CMD_WRITE); >> + if (pcc_ss_data->pending_pcc_write_cmd) >> + send_pcc_cmd(pcc_ss_id, CMD_WRITE); >> >> - ret = check_pcc_chan(false); >> + ret = check_pcc_chan(pcc_ss_id, false); >> if (ret) >> goto end; >> } else /* CMD_WRITE */ >> - pcc_data.pending_pcc_write_cmd = FALSE; >> + pcc_ss_data->pending_pcc_write_cmd = FALSE; >> >> /* >> * Handle the Minimum Request Turnaround Time(MRTT) >> * "The minimum amount of time that OSPM must wait after the completion >> * of a command before issuing the next command, in microseconds" >> */ >> - if (pcc_data.pcc_mrtt) { >> + if (pcc_ss_data->pcc_mrtt) { >> time_delta = ktime_us_delta(ktime_get(), last_cmd_cmpl_time); >> - if (pcc_data.pcc_mrtt > time_delta) >> - udelay(pcc_data.pcc_mrtt - time_delta); >> + if (pcc_ss_data->pcc_mrtt > time_delta) >> + udelay(pcc_ss_data->pcc_mrtt - time_delta); >> } >> >> /* >> @@ -275,16 +279,16 @@ static int send_pcc_cmd(u16 cmd) >> * not send the request to the platform after hitting the MPAR limit in >> * any 60s window >> */ >> - if (pcc_data.pcc_mpar) { >> + if (pcc_ss_data->pcc_mpar) { >> if (mpar_count == 0) { >> time_delta = ktime_ms_delta(ktime_get(), last_mpar_reset); >> - if (time_delta < 60 * MSEC_PER_SEC) { >> + if ((time_delta < 60 * MSEC_PER_SEC) && last_mpar_reset) { >> pr_debug("PCC cmd not sent due to MPAR limit"); >> ret = -EIO; >> goto end; >> } >> last_mpar_reset = ktime_get(); >> - mpar_count = pcc_data.pcc_mpar; >> + mpar_count = pcc_ss_data->pcc_mpar; >> } >> mpar_count--; >> } > The above mpar and mrtt checks should be modified to use per subspace variables. Will do. >> @@ -295,10 +299,10 @@ static int send_pcc_cmd(u16 cmd) >> /* Flip CMD COMPLETE bit */ >> writew_relaxed(0, &generic_comm_base->status); >> >> - pcc_data.platform_owns_pcc = true; >> + pcc_ss_data->platform_owns_pcc = true; >> >> /* Ring doorbell */ >> - ret = mbox_send_message(pcc_data.pcc_channel, &cmd); >> + ret = mbox_send_message(pcc_ss_data->pcc_channel, &cmd); >> if (ret < 0) { >> pr_err("Err sending PCC mbox message. cmd:%d, ret:%d\n", >> cmd, ret); >> @@ -306,15 +310,15 @@ static int send_pcc_cmd(u16 cmd) >> } >> >> /* wait for completion and check for PCC errro bit */ >> - ret = check_pcc_chan(true); >> + ret = check_pcc_chan(pcc_ss_id, true); >> >> - if (pcc_data.pcc_mrtt) >> + if (pcc_ss_data->pcc_mrtt) >> last_cmd_cmpl_time = ktime_get(); >> >> - if (pcc_data.pcc_channel->mbox->txdone_irq) >> - mbox_chan_txdone(pcc_data.pcc_channel, ret); >> + if (pcc_ss_data->pcc_channel->mbox->txdone_irq) >> + mbox_chan_txdone(pcc_ss_data->pcc_channel, ret); >> else >> - mbox_client_txdone(pcc_data.pcc_channel, ret); >> + mbox_client_txdone(pcc_ss_data->pcc_channel, ret); >> >> end: >> if (cmd == CMD_WRITE) { >> @@ -324,12 +328,12 @@ static int send_pcc_cmd(u16 cmd) >> if (!desc) >> continue; >> >> - if (desc->write_cmd_id == pcc_data.pcc_write_cnt) >> + if (desc->write_cmd_id == pcc_ss_data->pcc_write_cnt) >> desc->write_cmd_status = ret; >> } >> } >> - pcc_data.pcc_write_cnt++; >> - wake_up_all(&pcc_data.pcc_write_wait_q); >> + pcc_ss_data->pcc_write_cnt++; >> + wake_up_all(&pcc_ss_data->pcc_write_wait_q); >> } >> >> return ret; >> @@ -531,16 +535,16 @@ int acpi_get_psd_map(struct cppc_cpudata **all_cpu_data) >> } >> EXPORT_SYMBOL_GPL(acpi_get_psd_map); >> >> -static int register_pcc_channel(int pcc_subspace_idx) >> +static int register_pcc_channel(int pcc_ss_idx) >> { >> struct acpi_pcct_hw_reduced *cppc_ss; >> u64 usecs_lat; >> >> - if (pcc_subspace_idx >= 0) { >> - pcc_data.pcc_channel = pcc_mbox_request_channel(&cppc_mbox_cl, >> - pcc_subspace_idx); >> + if (pcc_ss_idx >= 0) { >> + pcc_data[pcc_ss_idx].pcc_channel = >> + pcc_mbox_request_channel(&cppc_mbox_cl, pcc_ss_idx); >> >> - if (IS_ERR(pcc_data.pcc_channel)) { >> + if (IS_ERR(pcc_data[pcc_ss_idx].pcc_channel)) { >> pr_err("Failed to find PCC communication channel\n"); >> return -ENODEV; >> } >> @@ -551,7 +555,7 @@ static int register_pcc_channel(int pcc_subspace_idx) >> * PCC channels) and stored pointers to the >> * subspace communication region in con_priv. >> */ >> - cppc_ss = (pcc_data.pcc_channel)->con_priv; >> + cppc_ss = (pcc_data[pcc_ss_idx].pcc_channel)->con_priv; >> >> if (!cppc_ss) { >> pr_err("No PCC subspace found for CPPC\n"); >> @@ -564,19 +568,20 @@ static int register_pcc_channel(int pcc_subspace_idx) >> * So add an arbitrary amount of wait on top of Nominal. >> */ >> usecs_lat = NUM_RETRIES * cppc_ss->latency; >> - pcc_data.deadline = ns_to_ktime(usecs_lat * NSEC_PER_USEC); >> - pcc_data.pcc_mrtt = cppc_ss->min_turnaround_time; >> - pcc_data.pcc_mpar = cppc_ss->max_access_rate; >> - pcc_data.pcc_nominal = cppc_ss->latency; >> - >> - pcc_data.pcc_comm_addr = acpi_os_ioremap(cppc_ss->base_address, cppc_ss->length); >> - if (!pcc_data.pcc_comm_addr) { >> + pcc_data[pcc_ss_idx].deadline = ns_to_ktime(usecs_lat * NSEC_PER_USEC); >> + pcc_data[pcc_ss_idx].pcc_mrtt = cppc_ss->min_turnaround_time; >> + pcc_data[pcc_ss_idx].pcc_mpar = cppc_ss->max_access_rate; >> + pcc_data[pcc_ss_idx].pcc_nominal = cppc_ss->latency; >> + >> + pcc_data[pcc_ss_idx].pcc_comm_addr = >> + acpi_os_ioremap(cppc_ss->base_address, cppc_ss->length); >> + if (!pcc_data[pcc_ss_idx].pcc_comm_addr) { >> pr_err("Failed to ioremap PCC comm region mem\n"); >> return -ENOMEM; >> } >> >> /* Set flag so that we dont come here for each CPU. */ >> - pcc_data.pcc_channel_acquired = true; >> + pcc_data[pcc_ss_idx].pcc_channel_acquired = true; >> } >> >> return 0; >> @@ -656,6 +661,7 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) >> struct device *cpu_dev; >> acpi_handle handle = pr->handle; >> unsigned int num_ent, i, cpc_rev; >> + unsigned int pcc_subspace_id = 0; >> acpi_status status; >> int ret = -EFAULT; >> >> @@ -728,12 +734,9 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) >> * so extract it only once. >> */ >> if (gas_t->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) { >> - if (pcc_data.pcc_subspace_idx < 0) >> - pcc_data.pcc_subspace_idx = gas_t->access_width; >> - else if (pcc_data.pcc_subspace_idx != gas_t->access_width) { >> - pr_debug("Mismatched PCC ids.\n"); >> - goto out_free; >> - } >> + pcc_subspace_id = gas_t->access_width; >> + pcc_data[pcc_subspace_id].pcc_subspace_idx = gas_t->access_width; >> + per_cpu(cpu_pcc_subspace_idx, pr->id) = gas_t->access_width; > pcc_data[pcc_subspace_id].pcc_subspace_idx = pcc_subspace_id; > per_cpu(cpu_pcc_subspace_idx, pr->id) = pcc_subspace_id; > > I don't see a need for pcc_subspace_idx to be in struct cppc_pcc_data > anymore. If you agree, may be we can remove it. Okay, I agree. > >> } else if (gas_t->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) { >> if (gas_t->address) { >> void __iomem *addr; >> @@ -766,14 +769,14 @@ int acpi_cppc_processor_probe(struct acpi_processor *pr) >> if (ret) >> goto out_free; >> >> - /* Register PCC channel once for all CPUs. */ >> - if (!pcc_data.pcc_channel_acquired) { >> - ret = register_pcc_channel(pcc_data.pcc_subspace_idx); >> + /* Register PCC channel once for all PCC subspace id. */ >> + if (!pcc_data[pcc_subspace_id].pcc_channel_acquired) { > Looks like we assume a PCC subspace is always present and looking at the > 6.2 spec it doesn't look like a mandatory requirement. So, the correct check > here should be: > if (pcc_subspace_id is valid && !pcc_data[pcc_subspace_id].pcc_channel_acquired) > > We need to make sure pcc_subspace_id is set to an invalid value until we find a valid > PCC subspace within the _CPC package. You can correct this in next version or I can > submit a small patch. Okay I will do the necessary changes. >> + ret = register_pcc_channel(pcc_data[pcc_subspace_id].pcc_subspace_idx); >> if (ret) >> goto out_free; >> >> - init_rwsem(&pcc_data.pcc_lock); >> - init_waitqueue_head(&pcc_data.pcc_write_wait_q); >> + init_rwsem(&pcc_data[pcc_subspace_id].pcc_lock); >> + init_waitqueue_head(&pcc_data[pcc_subspace_id].pcc_write_wait_q); >> } >> >> /* Everything looks okay */ >> @@ -883,6 +886,7 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val) >> { >> int ret_val = 0; >> void __iomem *vaddr = 0; >> + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); >> struct cpc_reg *reg = ®_res->cpc_entry.reg; >> >> if (reg_res->type == ACPI_TYPE_INTEGER) { >> @@ -892,7 +896,7 @@ static int cpc_read(int cpu, struct cpc_register_resource *reg_res, u64 *val) >> >> *val = 0; >> if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) >> - vaddr = GET_PCC_VADDR(reg->address); >> + vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id); >> else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) >> vaddr = reg_res->sys_mem_vaddr; >> else if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) >> @@ -927,10 +931,11 @@ static int cpc_write(int cpu, struct cpc_register_resource *reg_res, u64 val) >> { >> int ret_val = 0; >> void __iomem *vaddr = 0; >> + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); >> struct cpc_reg *reg = ®_res->cpc_entry.reg; >> >> if (reg->space_id == ACPI_ADR_SPACE_PLATFORM_COMM) >> - vaddr = GET_PCC_VADDR(reg->address); >> + vaddr = GET_PCC_VADDR(reg->address, pcc_ss_id); >> else if (reg->space_id == ACPI_ADR_SPACE_SYSTEM_MEMORY) >> vaddr = reg_res->sys_mem_vaddr; >> else if (reg->space_id == ACPI_ADR_SPACE_FIXED_HARDWARE) >> @@ -974,6 +979,8 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) >> struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); >> struct cpc_register_resource *highest_reg, *lowest_reg, *ref_perf, >> *nom_perf; >> + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum); >> + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; >> u64 high, low, nom; >> int ret = 0, regs_in_pcc = 0; >> >> @@ -991,9 +998,9 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) >> if (CPC_IN_PCC(highest_reg) || CPC_IN_PCC(lowest_reg) || >> CPC_IN_PCC(ref_perf) || CPC_IN_PCC(nom_perf)) { >> regs_in_pcc = 1; >> - down_write(&pcc_data.pcc_lock); >> + down_write(&pcc_ss_data->pcc_lock); >> /* Ring doorbell once to update PCC subspace */ >> - if (send_pcc_cmd(CMD_READ) < 0) { >> + if (send_pcc_cmd(pcc_ss_id, CMD_READ) < 0) { >> ret = -EIO; >> goto out_err; >> } >> @@ -1013,7 +1020,7 @@ int cppc_get_perf_caps(int cpunum, struct cppc_perf_caps *perf_caps) >> >> out_err: >> if (regs_in_pcc) >> - up_write(&pcc_data.pcc_lock); >> + up_write(&pcc_ss_data->pcc_lock); >> return ret; >> } >> EXPORT_SYMBOL_GPL(cppc_get_perf_caps); >> @@ -1030,6 +1037,8 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) >> struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpunum); >> struct cpc_register_resource *delivered_reg, *reference_reg, >> *ref_perf_reg, *ctr_wrap_reg; >> + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpunum); >> + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; >> u64 delivered, reference, ref_perf, ctr_wrap_time; >> int ret = 0, regs_in_pcc = 0; >> >> @@ -1053,10 +1062,10 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) >> /* Are any of the regs PCC ?*/ >> if (CPC_IN_PCC(delivered_reg) || CPC_IN_PCC(reference_reg) || >> CPC_IN_PCC(ctr_wrap_reg) || CPC_IN_PCC(ref_perf_reg)) { >> - down_write(&pcc_data.pcc_lock); >> + down_write(&pcc_ss_data->pcc_lock); >> regs_in_pcc = 1; >> /* Ring doorbell once to update PCC subspace */ >> - if (send_pcc_cmd(CMD_READ) < 0) { >> + if (send_pcc_cmd(pcc_ss_id, CMD_READ) < 0) { >> ret = -EIO; >> goto out_err; >> } >> @@ -1086,7 +1095,7 @@ int cppc_get_perf_ctrs(int cpunum, struct cppc_perf_fb_ctrs *perf_fb_ctrs) >> perf_fb_ctrs->ctr_wrap_time = ctr_wrap_time; >> out_err: >> if (regs_in_pcc) >> - up_write(&pcc_data.pcc_lock); >> + up_write(&pcc_ss_data->pcc_lock); >> return ret; >> } >> EXPORT_SYMBOL_GPL(cppc_get_perf_ctrs); >> @@ -1102,6 +1111,8 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) >> { >> struct cpc_desc *cpc_desc = per_cpu(cpc_desc_ptr, cpu); >> struct cpc_register_resource *desired_reg; >> + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu); >> + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; >> int ret = 0; >> >> if (!cpc_desc) { >> @@ -1119,11 +1130,11 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) >> * achieve that goal here >> */ >> if (CPC_IN_PCC(desired_reg)) { >> - down_read(&pcc_data.pcc_lock); /* BEGIN Phase-I */ >> - if (pcc_data.platform_owns_pcc) { >> - ret = check_pcc_chan(false); >> + down_read(&pcc_ss_data->pcc_lock); /* BEGIN Phase-I */ >> + if (pcc_ss_data->platform_owns_pcc) { >> + ret = check_pcc_chan(pcc_ss_id, false); >> if (ret) { >> - up_read(&pcc_data.pcc_lock); >> + up_read(&pcc_ss_data->pcc_lock); >> return ret; >> } >> } >> @@ -1131,8 +1142,8 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) >> * Update the pending_write to make sure a PCC CMD_READ will not >> * arrive and steal the channel during the switch to write lock >> */ >> - pcc_data.pending_pcc_write_cmd = true; >> - cpc_desc->write_cmd_id = pcc_data.pcc_write_cnt; >> + pcc_ss_data->pending_pcc_write_cmd = true; >> + cpc_desc->write_cmd_id = pcc_ss_data->pcc_write_cnt; >> cpc_desc->write_cmd_status = 0; >> } >> >> @@ -1143,7 +1154,7 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) >> cpc_write(cpu, desired_reg, perf_ctrls->desired_perf); >> >> if (CPC_IN_PCC(desired_reg)) >> - up_read(&pcc_data.pcc_lock); /* END Phase-I */ >> + up_read(&pcc_ss_data->pcc_lock); /* END Phase-I */ >> /* >> * This is Phase-II where we transfer the ownership of PCC to Platform >> * >> @@ -1191,15 +1202,15 @@ int cppc_set_perf(int cpu, struct cppc_perf_ctrls *perf_ctrls) >> * the write command before servicing the read command >> */ >> if (CPC_IN_PCC(desired_reg)) { >> - if (down_write_trylock(&pcc_data.pcc_lock)) { /* BEGIN Phase-II */ >> + if (down_write_trylock(&pcc_ss_data->pcc_lock)) {/* BEGIN Phase-II */ >> /* Update only if there are pending write commands */ >> - if (pcc_data.pending_pcc_write_cmd) >> - send_pcc_cmd(CMD_WRITE); >> - up_write(&pcc_data.pcc_lock); /* END Phase-II */ >> + if (pcc_ss_data->pending_pcc_write_cmd) >> + send_pcc_cmd(pcc_ss_id, CMD_WRITE); >> + up_write(&pcc_ss_data->pcc_lock); /* END Phase-II */ >> } else >> /* Wait until pcc_write_cnt is updated by send_pcc_cmd */ >> - wait_event(pcc_data.pcc_write_wait_q, >> - cpc_desc->write_cmd_id != pcc_data.pcc_write_cnt); >> + wait_event(pcc_ss_data->pcc_write_wait_q, >> + cpc_desc->write_cmd_id != pcc_ss_data->pcc_write_cnt); >> >> /* send_pcc_cmd updates the status in case of failure */ >> ret = cpc_desc->write_cmd_status; >> @@ -1232,6 +1243,8 @@ unsigned int cppc_get_transition_latency(int cpu_num) >> unsigned int latency_ns = 0; >> struct cpc_desc *cpc_desc; >> struct cpc_register_resource *desired_reg; >> + int pcc_ss_id = per_cpu(cpu_pcc_subspace_idx, cpu_num); >> + struct cppc_pcc_data *pcc_ss_data = &pcc_data[pcc_ss_id]; >> >> cpc_desc = per_cpu(cpc_desc_ptr, cpu_num); >> if (!cpc_desc) >> @@ -1241,11 +1254,11 @@ unsigned int cppc_get_transition_latency(int cpu_num) >> if (!CPC_IN_PCC(desired_reg)) >> return CPUFREQ_ETERNAL; >> >> - if (pcc_data.pcc_mpar) >> - latency_ns = 60 * (1000 * 1000 * 1000 / pcc_data.pcc_mpar); >> + if (pcc_ss_data->pcc_mpar) >> + latency_ns = 60 * (1000 * 1000 * 1000 / pcc_ss_data->pcc_mpar); >> >> - latency_ns = max(latency_ns, pcc_data.pcc_nominal * 1000); >> - latency_ns = max(latency_ns, pcc_data.pcc_mrtt * 1000); >> + latency_ns = max(latency_ns, pcc_ss_data->pcc_nominal * 1000); >> + latency_ns = max(latency_ns, pcc_ss_data->pcc_mrtt * 1000); >> >> return latency_ns; >> } > > When you send the next version with updates, can you please add a version > to the patches ex: [PATCH v2 2/2]? I think this series is v2, as it addresses some > of Alexey's comments on the initial version. Not only Alexey's comments, Initially this approach was rejected due to the ACPI spec(6.1) limitations. Now that the spec changes for multiple subspaces are adapted I thought of reseting the patch version to v1. Going forward I will maintain the versions. > > -- > Thanks, > Prashanth Regards, -George > ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids 2017-06-13 14:17 [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids George Cherian 2017-06-13 14:17 ` [PATCH 1/2] mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file George Cherian 2017-06-13 14:17 ` [PATCH 2/2] ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids George Cherian @ 2017-06-28 21:20 ` Rafael J. Wysocki 2017-07-10 22:07 ` Prakash, Prashanth 2 siblings, 1 reply; 11+ messages in thread From: Rafael J. Wysocki @ 2017-06-28 21:20 UTC (permalink / raw) To: George Cherian Cc: linux-acpi, linux-kernel, devel, lenb, jassisinghbrar, robert.moore, lv.zheng, Prashanth Prakash, Ashwin Chaugule, Ashwin Chaugule On Tuesday, June 13, 2017 02:17:09 PM George Cherian wrote: > The current cppc acpi driver works with only one pcc subspace id. > It maintains and registers only one pcc channel even if the acpi table has > different pcc subspace ids. > > As per ACPI 6.2 spec all PCC registers, for all processors in the same > performance domain (as defined by _PSD), must be defined to be in the same > subspace. The series tries to address the same by making cppc acpi driver > aware of multiple possible pcc subspace ids. > > Patch 1 : In preparation to share the MAX_PCC_SUBSPACE definition with cppc acpi > driver > Patch 2 : Make the cppc acpi driver aware of multiple pcc subspace ids. > > > George Cherian (2): > mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file > ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids > > drivers/acpi/cppc_acpi.c | 179 +++++++++++++++++++++++++---------------------- > drivers/mailbox/pcc.c | 1 - > include/acpi/pcc.h | 1 + > 3 files changed, 97 insertions(+), 84 deletions(-) I need Ashwing and Prashanth to look at this series and let me know what they think. Thanks, Rafael ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids 2017-06-28 21:20 ` [PATCH 0/2] " Rafael J. Wysocki @ 2017-07-10 22:07 ` Prakash, Prashanth 0 siblings, 0 replies; 11+ messages in thread From: Prakash, Prashanth @ 2017-07-10 22:07 UTC (permalink / raw) To: Rafael J. Wysocki, George Cherian Cc: linux-acpi, linux-kernel, devel, lenb, jassisinghbrar, robert.moore, lv.zheng, Ashwin Chaugule, Ashwin Chaugule On 6/28/2017 3:20 PM, Rafael J. Wysocki wrote: > On Tuesday, June 13, 2017 02:17:09 PM George Cherian wrote: >> The current cppc acpi driver works with only one pcc subspace id. >> It maintains and registers only one pcc channel even if the acpi table has >> different pcc subspace ids. >> >> As per ACPI 6.2 spec all PCC registers, for all processors in the same >> performance domain (as defined by _PSD), must be defined to be in the same >> subspace. The series tries to address the same by making cppc acpi driver >> aware of multiple possible pcc subspace ids. >> >> Patch 1 : In preparation to share the MAX_PCC_SUBSPACE definition with cppc acpi >> driver >> Patch 2 : Make the cppc acpi driver aware of multiple pcc subspace ids. >> >> >> George Cherian (2): >> mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file >> ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids >> >> drivers/acpi/cppc_acpi.c | 179 +++++++++++++++++++++++++---------------------- >> drivers/mailbox/pcc.c | 1 - >> include/acpi/pcc.h | 1 + >> 3 files changed, 97 insertions(+), 84 deletions(-) > I need Ashwing and Prashanth to look at this series and let me know what they > think. Rafael/George, I was on vacation last few weeks, I will go through this series this week and provide feedback. Sorry about the delay. -- Thanks, Prashanth ^ permalink raw reply [flat|nested] 11+ messages in thread
* [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids @ 2017-03-31 6:24 George Cherian 2017-04-03 16:44 ` Prakash, Prashanth 0 siblings, 1 reply; 11+ messages in thread From: George Cherian @ 2017-03-31 6:24 UTC (permalink / raw) To: linux-acpi, linux-kernel, devel Cc: ashwin.chaugule, rjw, lenb, jassisinghbrar, robert.moore, lv.zheng, George Cherian The current cppc acpi driver works with only one pcc subspace id. It maintains and registers only one pcc channel even if the acpi table has different pcc subspace ids. The series tries to address the same by making cppc acpi driver aware of multiple possible pcc subspace ids. Patch 1 : In preparation to share the MAX_PCC_SUBSPACE definition with cppc acpi driver Patch 2 : Make the cppc acpi driver aware of multiple pcc subspace ids. George Cherian (2): mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids drivers/acpi/cppc_acpi.c | 186 ++++++++++++++++++++++++++--------------------- drivers/mailbox/pcc.c | 1 - include/acpi/pcc.h | 1 + 3 files changed, 103 insertions(+), 85 deletions(-) -- 2.7.4 ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids 2017-03-31 6:24 George Cherian @ 2017-04-03 16:44 ` Prakash, Prashanth 2017-04-03 17:50 ` Hoan Tran 0 siblings, 1 reply; 11+ messages in thread From: Prakash, Prashanth @ 2017-04-03 16:44 UTC (permalink / raw) To: George Cherian, linux-acpi, linux-kernel, devel Cc: ashwin.chaugule, rjw, lenb, jassisinghbrar, robert.moore, lv.zheng Hi George, On 3/31/2017 12:24 AM, George Cherian wrote: > The current cppc acpi driver works with only one pcc subspace id. > It maintains and registers only one pcc channel even if the acpi table has > different pcc subspace ids. The series tries to address the same by making > cppc acpi driver aware of multiple possible pcc subspace ids. The current ACPI 6.1 spec restricts the CPPC to a single PCC subspace. See section: 8.4.7.1.9 Using PCC Registers, which states "If the PCC register space is used, all PCC registers must be defined to be in the same subspace." -- Thanks, Prashanth ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids 2017-04-03 16:44 ` Prakash, Prashanth @ 2017-04-03 17:50 ` Hoan Tran 2017-04-04 10:53 ` George Cherian 0 siblings, 1 reply; 11+ messages in thread From: Hoan Tran @ 2017-04-03 17:50 UTC (permalink / raw) To: Prakash, Prashanth Cc: George Cherian, linux acpi, lkml, devel, Ashwin Chaugule, Rafael J. Wysocki, Len Brown, Jassi Brar, Robert Moore, Lv Zheng Hi George, On Mon, Apr 3, 2017 at 9:44 AM, Prakash, Prashanth <pprakash@codeaurora.org> wrote: > Hi George, > > On 3/31/2017 12:24 AM, George Cherian wrote: >> The current cppc acpi driver works with only one pcc subspace id. >> It maintains and registers only one pcc channel even if the acpi table has >> different pcc subspace ids. The series tries to address the same by making >> cppc acpi driver aware of multiple possible pcc subspace ids. > The current ACPI 6.1 spec restricts the CPPC to a single PCC subspace. See section: > 8.4.7.1.9 Using PCC Registers, which states "If the PCC register space is used, all PCC > registers must be defined to be in the same subspace." Agreed with Prashanth, beside of that, spec also says "To amortize the cost of PCC transactions, OSPM should read or write all PCC registers via a single read or write command when possible." Thanks Hoan > > -- > Thanks, > Prashanth > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids 2017-04-03 17:50 ` Hoan Tran @ 2017-04-04 10:53 ` George Cherian 0 siblings, 0 replies; 11+ messages in thread From: George Cherian @ 2017-04-04 10:53 UTC (permalink / raw) To: Hoan Tran, Prakash, Prashanth Cc: George Cherian, linux acpi, lkml, devel, Ashwin Chaugule, Rafael J. Wysocki, Len Brown, Jassi Brar, Robert Moore, Lv Zheng Hi Hoan/Prashanth, On 04/03/2017 11:20 PM, Hoan Tran wrote: > Hi George, > > On Mon, Apr 3, 2017 at 9:44 AM, Prakash, Prashanth > <pprakash@codeaurora.org> wrote: >> Hi George, >> >> On 3/31/2017 12:24 AM, George Cherian wrote: >>> The current cppc acpi driver works with only one pcc subspace id. >>> It maintains and registers only one pcc channel even if the acpi table has >>> different pcc subspace ids. The series tries to address the same by making >>> cppc acpi driver aware of multiple possible pcc subspace ids. >> The current ACPI 6.1 spec restricts the CPPC to a single PCC subspace. See section: >> 8.4.7.1.9 Using PCC Registers, which states "If the PCC register space is used, all PCC >> registers must be defined to be in the same subspace." > > Agreed with Prashanth, beside of that, spec also says "To amortize the > cost of PCC transactions, OSPM should read or > write all PCC registers via a single read or write command when possible." Yes indeed the spec says so but it was not at all a scalable solution when platform has more number of CPU's and CPU domains. That is why we took this approach. > > Thanks > Hoan > >> >> -- >> Thanks, >> Prashanth >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-acpi" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 11+ messages in thread
end of thread, other threads:[~2017-07-14 11:02 UTC | newest] Thread overview: 11+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2017-06-13 14:17 [PATCH 0/2] Make cppc acpi driver aware of pcc subspace ids George Cherian 2017-06-13 14:17 ` [PATCH 1/2] mailbox: PCC: Move the MAX_PCC_SUBSPACES definition to header file George Cherian 2017-06-13 14:17 ` [PATCH 2/2] ACPI / CPPC: Make cppc acpi driver aware of pcc subspace ids George Cherian 2017-07-13 21:44 ` Prakash, Prashanth 2017-07-14 11:02 ` George Cherian 2017-06-28 21:20 ` [PATCH 0/2] " Rafael J. Wysocki 2017-07-10 22:07 ` Prakash, Prashanth -- strict thread matches above, loose matches on Subject: below -- 2017-03-31 6:24 George Cherian 2017-04-03 16:44 ` Prakash, Prashanth 2017-04-03 17:50 ` Hoan Tran 2017-04-04 10:53 ` George Cherian
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