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path: root/drivers/misc/cxl/vphb.c
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Diffstat (limited to 'drivers/misc/cxl/vphb.c')
-rw-r--r--drivers/misc/cxl/vphb.c78
1 files changed, 38 insertions, 40 deletions
diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c
index cdc7723b845d..dee8def1c193 100644
--- a/drivers/misc/cxl/vphb.c
+++ b/drivers/misc/cxl/vphb.c
@@ -9,6 +9,7 @@
#include <linux/pci.h>
#include <misc/cxl.h>
+#include <asm/pnv-pci.h>
#include "cxl.h"
static int cxl_dma_set_mask(struct pci_dev *pdev, u64 dma_mask)
@@ -44,7 +45,6 @@ static bool cxl_pci_enable_device_hook(struct pci_dev *dev)
{
struct pci_controller *phb;
struct cxl_afu *afu;
- struct cxl_context *ctx;
phb = pci_bus_to_host(dev->bus);
afu = (struct cxl_afu *)phb->private_data;
@@ -57,30 +57,7 @@ static bool cxl_pci_enable_device_hook(struct pci_dev *dev)
set_dma_ops(&dev->dev, &dma_direct_ops);
set_dma_offset(&dev->dev, PAGE_OFFSET);
- /*
- * Allocate a context to do cxl things too. If we eventually do real
- * DMA ops, we'll need a default context to attach them to
- */
- ctx = cxl_dev_context_init(dev);
- if (!ctx)
- return false;
- dev->dev.archdata.cxl_ctx = ctx;
-
- return (cxl_ops->afu_check_and_enable(afu) == 0);
-}
-
-static void cxl_pci_disable_device(struct pci_dev *dev)
-{
- struct cxl_context *ctx = cxl_get_context(dev);
-
- if (ctx) {
- if (ctx->status == STARTED) {
- dev_err(&dev->dev, "Default context started\n");
- return;
- }
- dev->dev.archdata.cxl_ctx = NULL;
- cxl_release_context(ctx);
- }
+ return _cxl_pci_associate_default_context(dev, afu);
}
static resource_size_t cxl_pci_window_alignment(struct pci_bus *bus,
@@ -197,8 +174,8 @@ static struct pci_controller_ops cxl_pci_controller_ops =
{
.probe_mode = cxl_pci_probe_mode,
.enable_device_hook = cxl_pci_enable_device_hook,
- .disable_device = cxl_pci_disable_device,
- .release_device = cxl_pci_disable_device,
+ .disable_device = _cxl_pci_disable_device,
+ .release_device = _cxl_pci_disable_device,
.window_alignment = cxl_pci_window_alignment,
.reset_secondary_bus = cxl_pci_reset_secondary_bus,
.setup_msi_irqs = cxl_setup_msi_irqs,
@@ -208,20 +185,30 @@ static struct pci_controller_ops cxl_pci_controller_ops =
int cxl_pci_vphb_add(struct cxl_afu *afu)
{
- struct pci_dev *phys_dev;
- struct pci_controller *phb, *phys_phb;
+ struct pci_controller *phb;
struct device_node *vphb_dn;
struct device *parent;
- if (cpu_has_feature(CPU_FTR_HVMODE)) {
- phys_dev = to_pci_dev(afu->adapter->dev.parent);
- phys_phb = pci_bus_to_host(phys_dev->bus);
- vphb_dn = phys_phb->dn;
- parent = &phys_dev->dev;
- } else {
- vphb_dn = afu->adapter->dev.parent->of_node;
- parent = afu->adapter->dev.parent;
- }
+ /*
+ * If there are no AFU configuration records we won't have anything to
+ * expose under the vPHB, so skip creating one, returning success since
+ * this is still a valid case. This will also opt us out of EEH
+ * handling since we won't have anything special to do if there are no
+ * kernel drivers attached to the vPHB, and EEH handling is not yet
+ * supported in the peer model.
+ */
+ if (!afu->crs_num)
+ return 0;
+
+ /* The parent device is the adapter. Reuse the device node of
+ * the adapter.
+ * We don't seem to care what device node is used for the vPHB,
+ * but tools such as lsvpd walk up the device parents looking
+ * for a valid location code, so we might as well show devices
+ * attached to the adapter as being located on that adapter.
+ */
+ parent = afu->adapter->dev.parent;
+ vphb_dn = parent->of_node;
/* Alloc and setup PHB data structure */
phb = pcibios_alloc_controller(vphb_dn);
@@ -272,13 +259,18 @@ void cxl_pci_vphb_remove(struct cxl_afu *afu)
pcibios_free_controller(phb);
}
+static bool _cxl_pci_is_vphb_device(struct pci_controller *phb)
+{
+ return (phb->ops == &cxl_pcie_pci_ops);
+}
+
bool cxl_pci_is_vphb_device(struct pci_dev *dev)
{
struct pci_controller *phb;
phb = pci_bus_to_host(dev->bus);
- return (phb->ops == &cxl_pcie_pci_ops);
+ return _cxl_pci_is_vphb_device(phb);
}
struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev)
@@ -287,7 +279,13 @@ struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev)
phb = pci_bus_to_host(dev->bus);
- return (struct cxl_afu *)phb->private_data;
+ if (_cxl_pci_is_vphb_device(phb))
+ return (struct cxl_afu *)phb->private_data;
+
+ if (pnv_pci_on_cxl_phb(dev))
+ return pnv_cxl_phb_to_afu(phb);
+
+ return ERR_PTR(-ENODEV);
}
EXPORT_SYMBOL_GPL(cxl_pci_to_afu);