On 05/03/2016 09:41 AM, Gavin Shan wrote:
On Wed, Apr 20, 2016 at 11:55:56AM +1000, Alistair Popple wrote:
On Tue, 19 Apr 2016 20:36:48 Alexey Kardashevskiy wrote:
On 02/17/2016 02:44 PM, Gavin Shan wrote:
This adds standalone driver to support PCI hotplug for PowerPC PowerNV
platform that runs on top of skiboot firmware. The firmware identifies
hotpluggable slots and marked their device tree node with proper
"ibm,slot-pluggable" and "ibm,reset-by-firmware". The driver scans
device tree nodes to create/register PCI hotplug slot accordingly.
The PCI slots are organized in fashion of tree, which means one
PCI slot might have parent PCI slot and parent PCI slot possibly
contains multiple child PCI slots. At the plugging time, the parent
PCI slot is populated before its children. The child PCI slots are
removed before their parent PCI slot can be removed from the system.
If the skiboot firmware doesn't support slot status retrieval, the PCI
slot device node shouldn't have property "ibm,reset-by-firmware". In
that case, none of valid PCI slots will be detected from device tree.
The skiboot firmware doesn't export the capability to access attention
LEDs yet and it's something for TBD.
Signed-off-by: Gavin Shan <gws...@linux.vnet.ibm.com>
Acked-by: Bjorn Helgaas <bhelg...@google.com>
---
drivers/pci/hotplug/Kconfig | 12 +
drivers/pci/hotplug/Makefile | 3 +
drivers/pci/hotplug/pnv_php.c | 870 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 885 insertions(+)
create mode 100644 drivers/pci/hotplug/pnv_php.c
diff --git a/drivers/pci/hotplug/Kconfig b/drivers/pci/hotplug/Kconfig
index df8caec..167c8ce 100644
--- a/drivers/pci/hotplug/Kconfig
+++ b/drivers/pci/hotplug/Kconfig
@@ -113,6 +113,18 @@ config HOTPLUG_PCI_SHPC
When in doubt, say N.
+config HOTPLUG_PCI_POWERNV
+ tristate "PowerPC PowerNV PCI Hotplug driver"
+ depends on PPC_POWERNV && EEH
+ help
+ Say Y here if you run PowerPC PowerNV platform that supports
+ PCI Hotplug
+
+ To compile this driver as a module, choose M here: the
+ module will be called pnv-php.
+
+ When in doubt, say N.
+
config HOTPLUG_PCI_RPA
tristate "RPA PCI Hotplug driver"
depends on PPC_PSERIES && EEH
diff --git a/drivers/pci/hotplug/Makefile b/drivers/pci/hotplug/Makefile
index b616e75..e33cdda 100644
--- a/drivers/pci/hotplug/Makefile
+++ b/drivers/pci/hotplug/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_HOTPLUG_PCI_PCIE) += pciehp.o
obj-$(CONFIG_HOTPLUG_PCI_CPCI_ZT5550) += cpcihp_zt5550.o
obj-$(CONFIG_HOTPLUG_PCI_CPCI_GENERIC) += cpcihp_generic.o
obj-$(CONFIG_HOTPLUG_PCI_SHPC) += shpchp.o
+obj-$(CONFIG_HOTPLUG_PCI_POWERNV) += pnv-php.o
obj-$(CONFIG_HOTPLUG_PCI_RPA) += rpaphp.o
obj-$(CONFIG_HOTPLUG_PCI_RPA_DLPAR) += rpadlpar_io.o
obj-$(CONFIG_HOTPLUG_PCI_SGI) += sgi_hotplug.o
@@ -50,6 +51,8 @@ ibmphp-objs := ibmphp_core.o \
acpiphp-objs := acpiphp_core.o \
acpiphp_glue.o
+pnv-php-objs := pnv_php.o
+
rpaphp-objs := rpaphp_core.o \
rpaphp_pci.o \
rpaphp_slot.o
diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c
new file mode 100644
index 0000000..364ec36
--- /dev/null
+++ b/drivers/pci/hotplug/pnv_php.c
@@ -0,0 +1,870 @@
+/*
+ * PCI Hotplug Driver for PowerPC PowerNV platform.
+ *
+ * Copyright Gavin Shan, IBM Corporation 2015.
+ *
+ * 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/libfdt.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/pci_hotplug.h>
+
+#include <asm/opal.h>
+#include <asm/pnv-pci.h>
+#include <asm/ppc-pci.h>
+
+#define DRIVER_VERSION "0.1"
+#define DRIVER_AUTHOR "Gavin Shan, IBM Corporation"
+#define DRIVER_DESC "PowerPC PowerNV PCI Hotplug Driver"
+
+struct pnv_php_slot {
+ struct hotplug_slot slot;
+ struct hotplug_slot_info slot_info;
+ uint64_t id;
+ char *name;
+ int slot_no;
+ struct kref kref;
+#define PNV_PHP_STATE_INITIALIZED 0
+#define PNV_PHP_STATE_REGISTERED 1
+#define PNV_PHP_STATE_POPULATED 2
+ int state;
+ struct device_node *dn;
+ struct pci_dev *pdev;
+ struct pci_bus *bus;
+ bool power_state_check;
+ int power_state_confirmed;
+#define PNV_PHP_POWER_CONFIRMED_INVALID 0
+#define PNV_PHP_POWER_CONFIRMED_SUCCESS 1
+#define PNV_PHP_POWER_CONFIRMED_FAIL 2
+ struct opal_msg *msg;
+ void *fdt;
+ void *dt;
+ struct of_changeset ocs;
+ struct work_struct work;
+ wait_queue_head_t queue;
+ struct pnv_php_slot *parent;
+ struct list_head children;
+ struct list_head link;
+};
+
+static LIST_HEAD(pnv_php_slot_list);
+static DEFINE_SPINLOCK(pnv_php_lock);
+
+static void pnv_php_register(struct device_node *dn);
+static void pnv_php_unregister_one(struct device_node *dn);
+static void pnv_php_unregister(struct device_node *dn);
The names confused me. I'd suggest pnv_php_scan(), pnv_php_unregister(),
pnv_php_unregister_children() instead.
Alistair, what do you reckon?
To be honest I'm not sure the new names are necessarily any less confusing. I
will admit to having to read that code twice though so perhaps a short comment
describing what each of those functions does would be the best method for
reducing confusion.
Alexey, Please confirm if I need rename those functions though I
don't understand the confusion caused the function names.
Just add the comments.
I got confused because:
pnv_php_register() walks through nodes to find "ibm,slot-pluggable" - this
is rather "scan" than "register" (which may not happen if the property is
not there).
pnv_php_register_one() registers one what? slot? From the name I conclude
that not a slot as there is pnv_php_register_slot() which does register one
slot. So I suppose pnv_php_register_one() registers one _node_ (which may
have multiple slots? there should be reason why it is a separate function).
I do not know...
[unrelated content removed]
--
Alexey
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