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authorFrederic Barrat <fbarrat@linux.vnet.ibm.com>2016-03-04 14:26:30 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2016-03-09 05:05:47 +0300
commitea2d1f95efd7c100617235918bac370414aec1ad (patch)
tree5382eaa83971ba74c3f28e7d0900c7cf0b7b7b01 /drivers/misc
parent2b04cf310ba8c123e9957cfab80274e7606bf53c (diff)
downloadlinux-ea2d1f95efd7c100617235918bac370414aec1ad.tar.xz
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>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/cxl/context.c3
-rw-r--r--drivers/misc/cxl/cxl.h7
-rw-r--r--drivers/misc/cxl/debugfs.c4
-rw-r--r--drivers/misc/cxl/fault.c19
4 files changed, 22 insertions, 11 deletions
diff --git a/drivers/misc/cxl/context.c b/drivers/misc/cxl/context.c
index aa65262d4a32..46f98441d7a1 100644
--- 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 02065b4defa2..40f67838dd6d 100644
--- 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 18df6f44af2a..5751899e0c17 100644
--- 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 ab740a19bd1e..9a8650bcb042 100644
--- 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 */