cxl: Add support for ASB_Notify on POWER9
The POWER9 core supports a new feature: ASB_Notify which requires the support of the Special Purpose Register: TIDR. The ASB_Notify command, generated by the AFU, will attempt to wake-up the host thread identified by the particular LPID:PID:TID. This patch assign a unique TIDR (thread id) for the current thread which will be used in the process element entry. Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com> Reviewed-by: Philippe Bergheaud <felix@linux.vnet.ibm.com> Acked-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Reviewed-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com> Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -1590,6 +1590,7 @@ int set_thread_tidr(struct task_struct *t)
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return 0;
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}
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EXPORT_SYMBOL_GPL(set_thread_tidr);
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#endif /* CONFIG_PPC64 */
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@ -45,6 +45,8 @@ int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master)
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ctx->pid = NULL; /* Set in start work ioctl */
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mutex_init(&ctx->mapping_lock);
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ctx->mapping = NULL;
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ctx->tidr = 0;
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ctx->assign_tidr = false;
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if (cxl_is_power8()) {
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spin_lock_init(&ctx->sste_lock);
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@ -630,6 +630,9 @@ struct cxl_context {
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struct list_head extra_irq_contexts;
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struct mm_struct *mm;
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u16 tidr;
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bool assign_tidr;
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};
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struct cxl_irq_info;
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@ -199,10 +199,11 @@ int cxllib_get_PE_attributes(struct task_struct *task,
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*/
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attr->pid = mm->context.id;
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mmput(mm);
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attr->tid = task->thread.tidr;
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} else {
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attr->pid = 0;
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attr->tid = 0;
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}
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attr->tid = 0;
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return 0;
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}
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EXPORT_SYMBOL_GPL(cxllib_get_PE_attributes);
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@ -173,7 +173,7 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
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* flags are set it's invalid
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*/
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if (work.reserved1 || work.reserved2 || work.reserved3 ||
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work.reserved4 || work.reserved5 || work.reserved6 ||
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work.reserved4 || work.reserved5 ||
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(work.flags & ~CXL_START_WORK_ALL)) {
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rc = -EINVAL;
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goto out;
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@ -186,12 +186,16 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
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rc = -EINVAL;
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goto out;
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}
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if ((rc = afu_register_irqs(ctx, work.num_interrupts)))
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goto out;
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if (work.flags & CXL_START_WORK_AMR)
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amr = work.amr & mfspr(SPRN_UAMOR);
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if (work.flags & CXL_START_WORK_TID)
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ctx->assign_tidr = true;
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ctx->mmio_err_ff = !!(work.flags & CXL_START_WORK_ERR_FF);
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/*
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@ -263,8 +267,15 @@ static long afu_ioctl_start_work(struct cxl_context *ctx,
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goto out;
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}
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ctx->status = STARTED;
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rc = 0;
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if (work.flags & CXL_START_WORK_TID) {
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work.tid = ctx->tidr;
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if (copy_to_user(uwork, &work, sizeof(work)))
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rc = -EFAULT;
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}
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ctx->status = STARTED;
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out:
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mutex_unlock(&ctx->status_mutex);
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return rc;
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@ -16,6 +16,7 @@
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#include <linux/uaccess.h>
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#include <linux/delay.h>
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#include <asm/synch.h>
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#include <asm/switch_to.h>
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#include <misc/cxl-base.h>
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#include "cxl.h"
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@ -655,6 +656,7 @@ static void update_ivtes_directed(struct cxl_context *ctx)
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static int process_element_entry_psl9(struct cxl_context *ctx, u64 wed, u64 amr)
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{
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u32 pid;
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int rc;
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cxl_assign_psn_space(ctx);
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@ -673,7 +675,16 @@ static int process_element_entry_psl9(struct cxl_context *ctx, u64 wed, u64 amr)
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pid = ctx->mm->context.id;
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}
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ctx->elem->common.tid = 0;
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/* Assign a unique TIDR (thread id) for the current thread */
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if (!(ctx->tidr) && (ctx->assign_tidr)) {
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rc = set_thread_tidr(current);
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if (rc)
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return -ENODEV;
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ctx->tidr = current->thread.tidr;
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pr_devel("%s: current tidr: %d\n", __func__, ctx->tidr);
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}
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ctx->elem->common.tid = cpu_to_be32(ctx->tidr);
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ctx->elem->common.pid = cpu_to_be32(pid);
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ctx->elem->sr = cpu_to_be64(calculate_sr(ctx));
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@ -20,20 +20,22 @@ struct cxl_ioctl_start_work {
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__u64 work_element_descriptor;
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__u64 amr;
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__s16 num_interrupts;
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__s16 reserved1;
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__s32 reserved2;
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__u16 tid;
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__s32 reserved1;
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__u64 reserved2;
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__u64 reserved3;
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__u64 reserved4;
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__u64 reserved5;
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__u64 reserved6;
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};
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#define CXL_START_WORK_AMR 0x0000000000000001ULL
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#define CXL_START_WORK_NUM_IRQS 0x0000000000000002ULL
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#define CXL_START_WORK_ERR_FF 0x0000000000000004ULL
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#define CXL_START_WORK_TID 0x0000000000000008ULL
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#define CXL_START_WORK_ALL (CXL_START_WORK_AMR |\
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CXL_START_WORK_NUM_IRQS |\
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CXL_START_WORK_ERR_FF)
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CXL_START_WORK_ERR_FF |\
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CXL_START_WORK_TID)
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/* Possible modes that an afu can be in */
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