Revert "cxl: Add kernel API to allow a context to operate with relocate disabled"

Remove abandonned capi support for the Mellanox CX4.
The symbol 'cxl_set_translation_mode' is never called, so
ctx->real_mode is always false.

This reverts commit 7a0d85d313c2066712e530e668bc02bb741a685c.

Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
Acked-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

5 files changed, 2 insertions, 32 deletions

diff --git a/drivers/misc/cxl/api.c b/drivers/misc/cxl/api.c
index 753b1a698fc4..21d620e29fea 100644
--- a/drivers/misc/cxl/api.c
+++ b/drivers/misc/cxl/api.c
@@ -324,7 +324,6 @@ int cxl_start_context(struct cxl_context *ctx, u64 wed,
         if (task) {
                 ctx->pid = get_task_pid(task, PIDTYPE_PID);
                 kernel = false;
-                ctx->real_mode = false;
 
                 /* acquire a reference to the task's mm */
                 ctx->mm = get_task_mm(current);
@@ -388,24 +387,6 @@ void cxl_set_master(struct cxl_context *ctx)
 }
 EXPORT_SYMBOL_GPL(cxl_set_master);
 
-int cxl_set_translation_mode(struct cxl_context *ctx, bool real_mode)
-{
-        if (ctx->status == STARTED) {
-                /*
-                 * We could potentially update the PE and issue an update LLCMD
-                 * to support this, but it doesn't seem to have a good use case
-                 * since it's trivial to just create a second kernel context
-                 * with different translation modes, so until someone convinces
-                 * me otherwise:
-                 */
-                return -EBUSY;
-        }
-
-        ctx->real_mode = real_mode;
-        return 0;
-}
-EXPORT_SYMBOL_GPL(cxl_set_translation_mode);
-
 /* wrappers around afu_* file ops which are EXPORTED */
 int cxl_fd_open(struct inode *inode, struct file *file)
 {
diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 918d4fb742d1..af8794719956 100644
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -613,7 +613,6 @@ struct cxl_context {
         bool pe_inserted;
         bool master;
         bool kernel;
-        bool real_mode;
         bool pending_irq;
         bool pending_fault;
         bool pending_afu_err;
diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
index 4644f16606a3..f5dc740fcd13 100644
--- a/drivers/misc/cxl/guest.c
+++ b/drivers/misc/cxl/guest.c
@@ -623,9 +623,6 @@ static int guest_attach_process(struct cxl_context *ctx, bool kernel, u64 wed, u
 {
         pr_devel("in %s\n", __func__);
 
-        if (ctx->real_mode)
-                return -EPERM;
-
         ctx->kernel = kernel;
         if (ctx->afu->current_mode == CXL_MODE_DIRECTED)
                 return attach_afu_directed(ctx, wed, amr);
diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c
index 98f867fcef24..c9d5d82dce8e 100644
--- a/drivers/misc/cxl/native.c
+++ b/drivers/misc/cxl/native.c
@@ -605,6 +605,7 @@ u64 cxl_calculate_sr(bool master, bool kernel, bool real_mode, bool p9)
                 sr |= CXL_PSL_SR_An_MP;
         if (mfspr(SPRN_LPCR) & LPCR_TC)
                 sr |= CXL_PSL_SR_An_TC;
+
         if (kernel) {
                 if (!real_mode)
                         sr |= CXL_PSL_SR_An_R;
@@ -629,7 +630,7 @@ u64 cxl_calculate_sr(bool master, bool kernel, bool real_mode, bool p9)
 
 static u64 calculate_sr(struct cxl_context *ctx)
 {
-        return cxl_calculate_sr(ctx->master, ctx->kernel, ctx->real_mode,
+        return cxl_calculate_sr(ctx->master, ctx->kernel, false,
                                 cxl_is_power9());
 }
 
diff --git a/include/misc/cxl.h b/include/misc/cxl.h
index b712be544f8c..82cc6ffafe2d 100644
--- a/include/misc/cxl.h
+++ b/include/misc/cxl.h
@@ -174,14 +174,6 @@ int cxl_afu_reset(struct cxl_context *ctx);
 void cxl_set_master(struct cxl_context *ctx);
 
 /*
- * Sets the context to use real mode memory accesses to operate with
- * translation disabled. Note that this only makes sense for kernel contexts
- * under bare metal, and will not work with virtualisation. May only be
- * performed on stopped contexts.
- */
-int cxl_set_translation_mode(struct cxl_context *ctx, bool real_mode);
-
-/*
  * Map and unmap the AFU Problem Space area. The amount and location mapped
  * depends on if this context is a master or slave.
  */