From b1db551324f72fa14ad82ca31237a7ed418104df Mon Sep 17 00:00:00 2001 From: Christophe Lombard Date: Thu, 11 Jan 2018 09:55:25 +0100 Subject: 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 Reviewed-by: Philippe Bergheaud Acked-by: Frederic Barrat Reviewed-by: Vaibhav Jain Acked-by: Andrew Donnellan Signed-off-by: Michael Ellerman --- drivers/misc/cxl/native.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'drivers/misc/cxl/native.c') diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c index 02b6b45b4c20..1b3d7c65ea3f 100644 --- a/drivers/misc/cxl/native.c +++ b/drivers/misc/cxl/native.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include "cxl.h" @@ -655,6 +656,7 @@ static void update_ivtes_directed(struct cxl_context *ctx) static int process_element_entry_psl9(struct cxl_context *ctx, u64 wed, u64 amr) { u32 pid; + int rc; cxl_assign_psn_space(ctx); @@ -673,7 +675,16 @@ static int process_element_entry_psl9(struct cxl_context *ctx, u64 wed, u64 amr) pid = ctx->mm->context.id; } - ctx->elem->common.tid = 0; + /* Assign a unique TIDR (thread id) for the current thread */ + if (!(ctx->tidr) && (ctx->assign_tidr)) { + rc = set_thread_tidr(current); + if (rc) + return -ENODEV; + ctx->tidr = current->thread.tidr; + pr_devel("%s: current tidr: %d\n", __func__, ctx->tidr); + } + + ctx->elem->common.tid = cpu_to_be32(ctx->tidr); ctx->elem->common.pid = cpu_to_be32(pid); ctx->elem->sr = cpu_to_be64(calculate_sr(ctx)); -- cgit v1.2.3