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path: root/drivers/misc/cxl/vphb.c
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-rw-r--r--drivers/misc/cxl/vphb.c269
1 files changed, 269 insertions, 0 deletions
diff --git a/drivers/misc/cxl/vphb.c b/drivers/misc/cxl/vphb.c
new file mode 100644
index 000000000000..f733309b65d5
--- /dev/null
+++ b/drivers/misc/cxl/vphb.c
@@ -0,0 +1,269 @@
+/*
+ * Copyright 2014 IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/pci.h>
+#include <misc/cxl.h>
+#include "cxl.h"
+
+static int cxl_dma_set_mask(struct pci_dev *pdev, u64 dma_mask)
+{
+ if (dma_mask < DMA_BIT_MASK(64)) {
+ pr_info("%s only 64bit DMA supported on CXL", __func__);
+ return -EIO;
+ }
+
+ *(pdev->dev.dma_mask) = dma_mask;
+ return 0;
+}
+
+static int cxl_pci_probe_mode(struct pci_bus *bus)
+{
+ return PCI_PROBE_NORMAL;
+}
+
+static int cxl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
+{
+ return -ENODEV;
+}
+
+static void cxl_teardown_msi_irqs(struct pci_dev *pdev)
+{
+ /*
+ * MSI should never be set but need still need to provide this call
+ * back.
+ */
+}
+
+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;
+ 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_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;
+ }
+ cxl_release_context(ctx);
+ }
+}
+
+static resource_size_t cxl_pci_window_alignment(struct pci_bus *bus,
+ unsigned long type)
+{
+ return 1;
+}
+
+static void cxl_pci_reset_secondary_bus(struct pci_dev *dev)
+{
+ /* Should we do an AFU reset here ? */
+}
+
+static int cxl_pcie_cfg_record(u8 bus, u8 devfn)
+{
+ return (bus << 8) + devfn;
+}
+
+static unsigned long cxl_pcie_cfg_addr(struct pci_controller* phb,
+ u8 bus, u8 devfn, int offset)
+{
+ int record = cxl_pcie_cfg_record(bus, devfn);
+
+ return (unsigned long)phb->cfg_addr + ((unsigned long)phb->cfg_data * record) + offset;
+}
+
+
+static int cxl_pcie_config_info(struct pci_bus *bus, unsigned int devfn,
+ int offset, int len,
+ volatile void __iomem **ioaddr,
+ u32 *mask, int *shift)
+{
+ struct pci_controller *phb;
+ struct cxl_afu *afu;
+ unsigned long addr;
+
+ phb = pci_bus_to_host(bus);
+ afu = (struct cxl_afu *)phb->private_data;
+ if (phb == NULL)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ if (cxl_pcie_cfg_record(bus->number, devfn) > afu->crs_num)
+ return PCIBIOS_DEVICE_NOT_FOUND;
+ if (offset >= (unsigned long)phb->cfg_data)
+ return PCIBIOS_BAD_REGISTER_NUMBER;
+ addr = cxl_pcie_cfg_addr(phb, bus->number, devfn, offset);
+
+ *ioaddr = (void *)(addr & ~0x3ULL);
+ *shift = ((addr & 0x3) * 8);
+ switch (len) {
+ case 1:
+ *mask = 0xff;
+ break;
+ case 2:
+ *mask = 0xffff;
+ break;
+ default:
+ *mask = 0xffffffff;
+ break;
+ }
+ return 0;
+}
+
+static int cxl_pcie_read_config(struct pci_bus *bus, unsigned int devfn,
+ int offset, int len, u32 *val)
+{
+ volatile void __iomem *ioaddr;
+ int shift, rc;
+ u32 mask;
+
+ rc = cxl_pcie_config_info(bus, devfn, offset, len, &ioaddr,
+ &mask, &shift);
+ if (rc)
+ return rc;
+
+ /* Can only read 32 bits */
+ *val = (in_le32(ioaddr) >> shift) & mask;
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static int cxl_pcie_write_config(struct pci_bus *bus, unsigned int devfn,
+ int offset, int len, u32 val)
+{
+ volatile void __iomem *ioaddr;
+ u32 v, mask;
+ int shift, rc;
+
+ rc = cxl_pcie_config_info(bus, devfn, offset, len, &ioaddr,
+ &mask, &shift);
+ if (rc)
+ return rc;
+
+ /* Can only write 32 bits so do read-modify-write */
+ mask <<= shift;
+ val <<= shift;
+
+ v = (in_le32(ioaddr) & ~mask) || (val & mask);
+
+ out_le32(ioaddr, v);
+ return PCIBIOS_SUCCESSFUL;
+}
+
+static struct pci_ops cxl_pcie_pci_ops =
+{
+ .read = cxl_pcie_read_config,
+ .write = cxl_pcie_write_config,
+};
+
+
+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,
+ .window_alignment = cxl_pci_window_alignment,
+ .reset_secondary_bus = cxl_pci_reset_secondary_bus,
+ .setup_msi_irqs = cxl_setup_msi_irqs,
+ .teardown_msi_irqs = cxl_teardown_msi_irqs,
+ .dma_set_mask = cxl_dma_set_mask,
+};
+
+int cxl_pci_vphb_add(struct cxl_afu *afu)
+{
+ struct pci_dev *phys_dev;
+ struct pci_controller *phb, *phys_phb;
+
+ phys_dev = to_pci_dev(afu->adapter->dev.parent);
+ phys_phb = pci_bus_to_host(phys_dev->bus);
+
+ /* Alloc and setup PHB data structure */
+ phb = pcibios_alloc_controller(phys_phb->dn);
+
+ if (!phb)
+ return -ENODEV;
+
+ /* Setup parent in sysfs */
+ phb->parent = &phys_dev->dev;
+
+ /* Setup the PHB using arch provided callback */
+ phb->ops = &cxl_pcie_pci_ops;
+ phb->cfg_addr = afu->afu_desc_mmio + afu->crs_offset;
+ phb->cfg_data = (void *)(u64)afu->crs_len;
+ phb->private_data = afu;
+ phb->controller_ops = cxl_pci_controller_ops;
+
+ /* Scan the bus */
+ pcibios_scan_phb(phb);
+ if (phb->bus == NULL)
+ return -ENXIO;
+
+ /* Claim resources. This might need some rework as well depending
+ * whether we are doing probe-only or not, like assigning unassigned
+ * resources etc...
+ */
+ pcibios_claim_one_bus(phb->bus);
+
+ /* Add probed PCI devices to the device model */
+ pci_bus_add_devices(phb->bus);
+
+ afu->phb = phb;
+
+ return 0;
+}
+
+
+void cxl_pci_vphb_remove(struct cxl_afu *afu)
+{
+ struct pci_controller *phb;
+
+ /* If there is no configuration record we won't have one of these */
+ if (!afu || !afu->phb)
+ return;
+
+ phb = afu->phb;
+
+ pci_remove_root_bus(phb->bus);
+}
+
+struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev)
+{
+ struct pci_controller *phb;
+
+ phb = pci_bus_to_host(dev->bus);
+
+ return (struct cxl_afu *)phb->private_data;
+}
+EXPORT_SYMBOL_GPL(cxl_pci_to_afu);
+
+unsigned int cxl_pci_to_cfg_record(struct pci_dev *dev)
+{
+ return cxl_pcie_cfg_record(dev->bus->number, dev->devfn);
+}
+EXPORT_SYMBOL_GPL(cxl_pci_to_cfg_record);

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