cxl: Isolate a few bare-metal-specific calls

A few functions are mostly common between bare-metal and guest and
just need minor tuning. To avoid crowding the backend API, introduce a
few 'if' based on the CPU being in HV mode.

Co-authored-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: Manoj Kumar <manoj@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
index aa65262..46f9844 100644 (file)
--- a/drivers/misc/cxl/context.c
+++ b/drivers/misc/cxl/context.c
@@ -95,7 +95,8 @@ int cxl_context_init(struct cxl_context *ctx, struct cxl_afu *afu, bool master,
                return i;
 
        ctx->pe = i;
-       ctx->elem = &ctx->afu->spa[i];
+       if (cpu_has_feature(CPU_FTR_HVMODE))
+               ctx->elem = &ctx->afu->spa[i];
        ctx->pe_inserted = false;
 
        /*

diff --git a/drivers/misc/cxl/cxl.h b/drivers/misc/cxl/cxl.h
index 02065b4..40f6783 100644 (file)
--- a/drivers/misc/cxl/cxl.h
+++ b/drivers/misc/cxl/cxl.h
@@ -560,8 +560,11 @@ static inline bool cxl_adapter_link_ok(struct cxl *cxl)
 {
        struct pci_dev *pdev;
 
-       pdev = to_pci_dev(cxl->dev.parent);
-       return !pci_channel_offline(pdev);
+       if (cpu_has_feature(CPU_FTR_HVMODE)) {
+               pdev = to_pci_dev(cxl->dev.parent);
+               return !pci_channel_offline(pdev);
+       }
+       return true;
 }
 
 static inline void __iomem *_cxl_p1_addr(struct cxl *cxl, cxl_p1_reg_t reg)

diff --git a/drivers/misc/cxl/debugfs.c b/drivers/misc/cxl/debugfs.c
index 18df6f4..5751899 100644 (file)
--- a/drivers/misc/cxl/debugfs.c
+++ b/drivers/misc/cxl/debugfs.c
@@ -118,6 +118,10 @@ void cxl_debugfs_afu_remove(struct cxl_afu *afu)
 int __init cxl_debugfs_init(void)
 {
        struct dentry *ent;
+
+       if (!cpu_has_feature(CPU_FTR_HVMODE))
+               return 0;
+
        ent = debugfs_create_dir("cxl", NULL);
        if (IS_ERR(ent))
                return PTR_ERR(ent);

diff --git a/drivers/misc/cxl/fault.c b/drivers/misc/cxl/fault.c
index ab740a1..9a8650b 100644 (file)
--- a/drivers/misc/cxl/fault.c
+++ b/drivers/misc/cxl/fault.c
@@ -254,14 +254,17 @@ void cxl_handle_fault(struct work_struct *fault_work)
        u64 dar = ctx->dar;
        struct mm_struct *mm = NULL;
 
-       if (cxl_p2n_read(ctx->afu, CXL_PSL_DSISR_An) != dsisr ||
-           cxl_p2n_read(ctx->afu, CXL_PSL_DAR_An) != dar ||
-           cxl_p2n_read(ctx->afu, CXL_PSL_PEHandle_An) != ctx->pe) {
-               /* Most likely explanation is harmless - a dedicated process
-                * has detached and these were cleared by the PSL purge, but
-                * warn about it just in case */
-               dev_notice(&ctx->afu->dev, "cxl_handle_fault: Translation fault regs changed\n");
-               return;
+       if (cpu_has_feature(CPU_FTR_HVMODE)) {
+               if (cxl_p2n_read(ctx->afu, CXL_PSL_DSISR_An) != dsisr ||
+                   cxl_p2n_read(ctx->afu, CXL_PSL_DAR_An) != dar ||
+                   cxl_p2n_read(ctx->afu, CXL_PSL_PEHandle_An) != ctx->pe) {
+                       /* Most likely explanation is harmless - a dedicated
+                        * process has detached and these were cleared by the
+                        * PSL purge, but warn about it just in case
+                        */
+                       dev_notice(&ctx->afu->dev, "cxl_handle_fault: Translation fault regs changed\n");
+                       return;
+               }
        }
 
        /* Early return if the context is being / has been detached */