[Bionic][PATCH 12/18] Revert "cxl: Add cxl_check_and_switch_mode() API to switch bi-modal cards"
Jose Ricardo Ziviani
joserz at linux.ibm.com
Wed Oct 31 15:09:25 UTC 2018
From: Alastair D'Silva <alastair at d-silva.org>
BugLink: https://bugs.launchpad.net/qemu-kvm/+bug/1800649
Remove abandonned capi support for the Mellanox CX4.
This reverts commit b0b5e5918ad1babfd1d43d98c7281926a7b57b9f.
Signed-off-by: Alastair D'Silva <alastair at d-silva.org>
Acked-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
(cherry picked from commit 29fea8aa21a69418386e3e08fa546a0ba9bee96d)
Signed-off-by: Jose Ricardo Ziviani <joserz at linux.ibm.com>
---
drivers/misc/cxl/Kconfig | 8 --
drivers/misc/cxl/pci.c | 238 ++++-----------------------------------
include/misc/cxl.h | 25 ----
3 files changed, 19 insertions(+), 252 deletions(-)
diff --git a/drivers/misc/cxl/Kconfig b/drivers/misc/cxl/Kconfig
index 93397cb05b15..3ce933707828 100644
--- a/drivers/misc/cxl/Kconfig
+++ b/drivers/misc/cxl/Kconfig
@@ -33,11 +33,3 @@ config CXL
CAPI adapters are found in POWER8 based systems.
If unsure, say N.
-
-config CXL_BIMODAL
- bool "Support for bi-modal CAPI cards"
- depends on HOTPLUG_PCI_POWERNV = y && CXL || HOTPLUG_PCI_POWERNV = m && CXL = m
- default y
- help
- Select this option to enable support for bi-modal CAPI cards, such as
- the Mellanox CX-4.
diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c
index 429d6de1dde7..9c5a21fee835 100644
--- a/drivers/misc/cxl/pci.c
+++ b/drivers/misc/cxl/pci.c
@@ -55,8 +55,6 @@
pci_read_config_byte(dev, vsec + 0xa, dest)
#define CXL_WRITE_VSEC_MODE_CONTROL(dev, vsec, val) \
pci_write_config_byte(dev, vsec + 0xa, val)
-#define CXL_WRITE_VSEC_MODE_CONTROL_BUS(bus, devfn, vsec, val) \
- pci_bus_write_config_byte(bus, devfn, vsec + 0xa, val)
#define CXL_VSEC_PROTOCOL_MASK 0xe0
#define CXL_VSEC_PROTOCOL_1024TB 0x80
#define CXL_VSEC_PROTOCOL_512TB 0x40
@@ -800,235 +798,37 @@ static int setup_cxl_bars(struct pci_dev *dev)
return 0;
}
-#ifdef CONFIG_CXL_BIMODAL
-
-struct cxl_switch_work {
- struct pci_dev *dev;
- struct work_struct work;
- int vsec;
- int mode;
-};
-
-static void switch_card_to_cxl(struct work_struct *work)
+/* pciex node: ibm,opal-m64-window = <0x3d058 0x0 0x3d058 0x0 0x8 0x0>; */
+static int switch_card_to_cxl(struct pci_dev *dev)
{
- struct cxl_switch_work *switch_work =
- container_of(work, struct cxl_switch_work, work);
- struct pci_dev *dev = switch_work->dev;
- struct pci_bus *bus = dev->bus;
- struct pci_controller *hose = pci_bus_to_host(bus);
- struct pci_dev *bridge;
- struct pnv_php_slot *php_slot;
- unsigned int devfn;
+ int vsec;
u8 val;
int rc;
- dev_info(&bus->dev, "cxl: Preparing for mode switch...\n");
- bridge = list_first_entry_or_null(&hose->bus->devices, struct pci_dev,
- bus_list);
- if (!bridge) {
- dev_WARN(&bus->dev, "cxl: Couldn't find root port!\n");
- goto err_dev_put;
- }
+ dev_info(&dev->dev, "switch card to CXL\n");
- php_slot = pnv_php_find_slot(pci_device_to_OF_node(bridge));
- if (!php_slot) {
- dev_err(&bus->dev, "cxl: Failed to find slot hotplug "
- "information. You may need to upgrade "
- "skiboot. Aborting.\n");
- goto err_dev_put;
+ if (!(vsec = find_cxl_vsec(dev))) {
+ dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n");
+ return -ENODEV;
}
- rc = CXL_READ_VSEC_MODE_CONTROL(dev, switch_work->vsec, &val);
- if (rc) {
- dev_err(&bus->dev, "cxl: Failed to read CAPI mode control: %i\n", rc);
- goto err_dev_put;
+ if ((rc = CXL_READ_VSEC_MODE_CONTROL(dev, vsec, &val))) {
+ dev_err(&dev->dev, "failed to read current mode control: %i", rc);
+ return rc;
}
- devfn = dev->devfn;
-
- /* Release the reference obtained in cxl_check_and_switch_mode() */
- pci_dev_put(dev);
-
- dev_dbg(&bus->dev, "cxl: Removing PCI devices from kernel\n");
- pci_lock_rescan_remove();
- pci_hp_remove_devices(bridge->subordinate);
- pci_unlock_rescan_remove();
-
- /* Switch the CXL protocol on the card */
- if (switch_work->mode == CXL_BIMODE_CXL) {
- dev_info(&bus->dev, "cxl: Switching card to CXL mode\n");
- val &= ~CXL_VSEC_PROTOCOL_MASK;
- val |= CXL_VSEC_PROTOCOL_256TB | CXL_VSEC_PROTOCOL_ENABLE;
- rc = pnv_cxl_enable_phb_kernel_api(hose, true);
- if (rc) {
- dev_err(&bus->dev, "cxl: Failed to enable kernel API"
- " on real PHB, aborting\n");
- goto err_free_work;
- }
- } else {
- dev_WARN(&bus->dev, "cxl: Switching card to PCI mode not supported!\n");
- goto err_free_work;
+ val &= ~CXL_VSEC_PROTOCOL_MASK;
+ val |= CXL_VSEC_PROTOCOL_256TB | CXL_VSEC_PROTOCOL_ENABLE;
+ if ((rc = CXL_WRITE_VSEC_MODE_CONTROL(dev, vsec, val))) {
+ dev_err(&dev->dev, "failed to enable CXL protocol: %i", rc);
+ return rc;
}
-
- rc = CXL_WRITE_VSEC_MODE_CONTROL_BUS(bus, devfn, switch_work->vsec, val);
- if (rc) {
- dev_err(&bus->dev, "cxl: Failed to configure CXL protocol: %i\n", rc);
- goto err_free_work;
- }
-
/*
- * The CAIA spec (v1.1, Section 10.6 Bi-modal Device Support) states
- * we must wait 100ms after this mode switch before touching PCIe config
- * space.
+ * The CAIA spec (v0.12 11.6 Bi-modal Device Support) states
+ * we must wait 100ms after this mode switch before touching
+ * PCIe config space.
*/
msleep(100);
- /*
- * Hot reset to cause the card to come back in cxl mode. A
- * OPAL_RESET_PCI_LINK would be sufficient, but currently lacks support
- * in skiboot, so we use a hot reset instead.
- *
- * We call pci_set_pcie_reset_state() on the bridge, as a CAPI card is
- * guaranteed to sit directly under the root port, and setting the reset
- * state on a device directly under the root port is equivalent to doing
- * it on the root port iself.
- */
- dev_info(&bus->dev, "cxl: Configuration write complete, resetting card\n");
- pci_set_pcie_reset_state(bridge, pcie_hot_reset);
- pci_set_pcie_reset_state(bridge, pcie_deassert_reset);
-
- dev_dbg(&bus->dev, "cxl: Offlining slot\n");
- rc = pnv_php_set_slot_power_state(&php_slot->slot, OPAL_PCI_SLOT_OFFLINE);
- if (rc) {
- dev_err(&bus->dev, "cxl: OPAL offlining call failed: %i\n", rc);
- goto err_free_work;
- }
-
- dev_dbg(&bus->dev, "cxl: Onlining and probing slot\n");
- rc = pnv_php_set_slot_power_state(&php_slot->slot, OPAL_PCI_SLOT_ONLINE);
- if (rc) {
- dev_err(&bus->dev, "cxl: OPAL onlining call failed: %i\n", rc);
- goto err_free_work;
- }
-
- pci_lock_rescan_remove();
- pci_hp_add_devices(bridge->subordinate);
- pci_unlock_rescan_remove();
-
- dev_info(&bus->dev, "cxl: CAPI mode switch completed\n");
- kfree(switch_work);
- return;
-
-err_dev_put:
- /* Release the reference obtained in cxl_check_and_switch_mode() */
- pci_dev_put(dev);
-err_free_work:
- kfree(switch_work);
-}
-
-int cxl_check_and_switch_mode(struct pci_dev *dev, int mode, int vsec)
-{
- struct cxl_switch_work *work;
- u8 val;
- int rc;
-
- if (!cpu_has_feature(CPU_FTR_HVMODE))
- return -ENODEV;
-
- if (!vsec) {
- vsec = find_cxl_vsec(dev);
- if (!vsec) {
- dev_info(&dev->dev, "CXL VSEC not found\n");
- return -ENODEV;
- }
- }
-
- rc = CXL_READ_VSEC_MODE_CONTROL(dev, vsec, &val);
- if (rc) {
- dev_err(&dev->dev, "Failed to read current mode control: %i", rc);
- return rc;
- }
-
- if (mode == CXL_BIMODE_PCI) {
- if (!(val & CXL_VSEC_PROTOCOL_ENABLE)) {
- dev_info(&dev->dev, "Card is already in PCI mode\n");
- return 0;
- }
- /*
- * TODO: Before it's safe to switch the card back to PCI mode
- * we need to disable the CAPP and make sure any cachelines the
- * card holds have been flushed out. Needs skiboot support.
- */
- dev_WARN(&dev->dev, "CXL mode switch to PCI unsupported!\n");
- return -EIO;
- }
-
- if (val & CXL_VSEC_PROTOCOL_ENABLE) {
- dev_info(&dev->dev, "Card is already in CXL mode\n");
- return 0;
- }
-
- dev_info(&dev->dev, "Card is in PCI mode, scheduling kernel thread "
- "to switch to CXL mode\n");
-
- work = kmalloc(sizeof(struct cxl_switch_work), GFP_KERNEL);
- if (!work)
- return -ENOMEM;
-
- pci_dev_get(dev);
- work->dev = dev;
- work->vsec = vsec;
- work->mode = mode;
- INIT_WORK(&work->work, switch_card_to_cxl);
-
- schedule_work(&work->work);
-
- /*
- * We return a failure now to abort the driver init. Once the
- * link has been cycled and the card is in cxl mode we will
- * come back (possibly using the generic cxl driver), but
- * return success as the card should then be in cxl mode.
- *
- * TODO: What if the card comes back in PCI mode even after
- * the switch? Don't want to spin endlessly.
- */
- return -EBUSY;
-}
-EXPORT_SYMBOL_GPL(cxl_check_and_switch_mode);
-
-#endif /* CONFIG_CXL_BIMODAL */
-
-static int setup_cxl_protocol_area(struct pci_dev *dev)
-{
- u8 val;
- int rc;
- int vsec = find_cxl_vsec(dev);
-
- if (!vsec) {
- dev_info(&dev->dev, "CXL VSEC not found\n");
- return -ENODEV;
- }
-
- rc = CXL_READ_VSEC_MODE_CONTROL(dev, vsec, &val);
- if (rc) {
- dev_err(&dev->dev, "Failed to read current mode control: %i\n", rc);
- return rc;
- }
-
- if (!(val & CXL_VSEC_PROTOCOL_ENABLE)) {
- dev_err(&dev->dev, "Card not in CAPI mode!\n");
- return -EIO;
- }
-
- if ((val & CXL_VSEC_PROTOCOL_MASK) != CXL_VSEC_PROTOCOL_256TB) {
- val &= ~CXL_VSEC_PROTOCOL_MASK;
- val |= CXL_VSEC_PROTOCOL_256TB;
- rc = CXL_WRITE_VSEC_MODE_CONTROL(dev, vsec, val);
- if (rc) {
- dev_err(&dev->dev, "Failed to set CXL protocol area: %i\n", rc);
- return rc;
- }
- }
-
return 0;
}
@@ -1724,7 +1524,7 @@ static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev)
if ((rc = setup_cxl_bars(dev)))
return rc;
- if ((rc = setup_cxl_protocol_area(dev)))
+ if ((rc = switch_card_to_cxl(dev)))
return rc;
if ((rc = cxl_update_image_control(adapter)))
diff --git a/include/misc/cxl.h b/include/misc/cxl.h
index 96e188227e6e..9d45eacfcc99 100644
--- a/include/misc/cxl.h
+++ b/include/misc/cxl.h
@@ -39,31 +39,6 @@
bool cxl_slot_is_supported(struct pci_dev *dev, int flags);
-#define CXL_BIMODE_CXL 1
-#define CXL_BIMODE_PCI 2
-
-/*
- * Check the mode that the given bi-modal CXL adapter is currently in and
- * change it if necessary. This does not apply to AFU drivers.
- *
- * If the mode matches the requested mode this function will return 0 - if the
- * driver was expecting the generic CXL driver to have bound to the adapter and
- * it gets this return value it should fail the probe function to give the CXL
- * driver a chance to probe it.
- *
- * If the mode does not match it will start a background task to unplug the
- * device from Linux and switch its mode, and will return -EBUSY. At this
- * point the calling driver should make sure it has released the device and
- * fail its probe function.
- *
- * The offset of the CXL VSEC can be provided to this function. If 0 is passed,
- * this function will search for a CXL VSEC with ID 0x1280 and return -ENODEV
- * if it is not found.
- */
-#ifdef CONFIG_CXL_BIMODAL
-int cxl_check_and_switch_mode(struct pci_dev *dev, int mode, int vsec);
-#endif
-
/* Get the AFU associated with a pci_dev */
struct cxl_afu *cxl_pci_to_afu(struct pci_dev *dev);
--
2.17.2
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