i7300_idle: Disable ioat channel only on platforms where ile driver can load

Based on input from Andi Kleen:
share the platform detection code with ioat_dma and disable the channel in
dma engine only for specific platforms.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 83 insertions, 0 deletions

diff --git a/include/linux/i7300_idle.h b/include/linux/i7300_idle.h
new file mode 100644
index 000000000000..05a80c44513c
--- /dev/null
+++ b/include/linux/i7300_idle.h
@@ -0,0 +1,83 @@
+
+#ifndef I7300_IDLE_H
+#define I7300_IDLE_H
+
+#include <linux/pci.h>
+
+/*
+ * I/O AT controls (PCI bus 0 device 8 function 0)
+ * DIMM controls (PCI bus 0 device 16 function 1)
+ */
+#define IOAT_BUS 0
+#define IOAT_DEVFN PCI_DEVFN(8, 0)
+#define MEMCTL_BUS 0
+#define MEMCTL_DEVFN PCI_DEVFN(16, 1)
+
+struct fbd_ioat {
+        unsigned int vendor;
+        unsigned int ioat_dev;
+};
+
+/*
+ * The i5000 chip-set has the same hooks as the i7300
+ * but support is disabled by default because this driver
+ * has not been validated on that platform.
+ */
+#define SUPPORT_I5000 0
+
+static const struct fbd_ioat fbd_ioat_list[] = {
+        {PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT_CNB},
+#if SUPPORT_I5000
+        {PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_IOAT},
+#endif
+        {0, 0}
+};
+
+/* table of devices that work with this driver */
+static const struct pci_device_id pci_tbl[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_FBD_CNB) },
+#if SUPPORT_I5000
+        { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_5000_ERR) },
+#endif
+        { } /* Terminating entry */
+};
+
+/* Check for known platforms with I/O-AT */
+static inline int i7300_idle_platform_probe(struct pci_dev **fbd_dev,
+                                                struct pci_dev **ioat_dev)
+{
+        int i;
+        struct pci_dev *memdev, *dmadev;
+
+        memdev = pci_get_bus_and_slot(MEMCTL_BUS, MEMCTL_DEVFN);
+        if (!memdev)
+                return -ENODEV;
+
+        for (i = 0; pci_tbl[i].vendor != 0; i++) {
+                if (memdev->vendor == pci_tbl[i].vendor &&
+                    memdev->device == pci_tbl[i].device) {
+                        break;
+                }
+        }
+        if (pci_tbl[i].vendor == 0)
+                return -ENODEV;
+
+        dmadev = pci_get_bus_and_slot(IOAT_BUS, IOAT_DEVFN);
+        if (!dmadev)
+                return -ENODEV;
+
+        for (i = 0; fbd_ioat_list[i].vendor != 0; i++) {
+                if (dmadev->vendor == fbd_ioat_list[i].vendor &&
+                    dmadev->device == fbd_ioat_list[i].ioat_dev) {
+                        if (fbd_dev)
+                                *fbd_dev = memdev;
+                        if (ioat_dev)
+                                *ioat_dev = dmadev;
+
+                        return 0;
+                }
+        }
+        return -ENODEV;
+}
+
+#endif