diff options
| author | Christophe Lombard <clombard@linux.vnet.ibm.com> | 2018-01-11 09:55:25 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-01-19 23:19:37 +1100 |
| commit | b1db551324f72fa14ad82ca31237a7ed418104df (patch) | |
| tree | 3e43a06af0f301bf89b3746b82cb2e7bda7f8afc /drivers/misc/cxl/native.c | |
| parent | 074db39e00bb0d35cda7de9a4bae3a9b6da557ad (diff) | |
| download | linux-b1db551324f72fa14ad82ca31237a7ed418104df.tar.bz2 | |
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>
Diffstat (limited to 'drivers/misc/cxl/native.c')
| -rw-r--r-- | drivers/misc/cxl/native.c | 13 |
1 files changed, 12 insertions, 1 deletions
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 <linux/uaccess.h> #include <linux/delay.h> #include <asm/synch.h> +#include <asm/switch_to.h> #include <misc/cxl-base.h> #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)); |