[PATCH 5/6]: hotplug/ia64: SN Hotplug Driver - SN Hotplug Driver

Prarit Bhargava
2005-05-12T13:48:27Z

This patch is the SGI hotplug driver and additional changes required for
the driver. These modifications include changes to the SN io_init.c code
for memory management, the inclusion of new SAL calls to enable and disable
PCI slots, and a hotplug-style driver.

Signed-off-by: Prarit Bhargava <prarit@sgi.com>

---
commit b37f84886e06a5892a02a0906e8b3f2d51daf1d2
tree d42322aa13214a5d099019ff0406dfb328960b98
parent a4c6ca89d0e410957323fb88e57421aaf1ca621b
author Prarit Bhargava <prarit@sgi.com> 1810126625 -0400
committer Prarit Bhargava <prarit@sgi.com> 1810126625 -0400

Index: arch/ia64/sn/kernel/io_init.c
=================================--- 94b3c225a19fb0e688da58fa7c9239db0a743e9c/arch/ia64/sn/kernel/io_init.c
(mode:100644 sha1:ae6628cd41f8cc2f94643fce2c4fe21bdd85d2d9)
+++ d42322aa13214a5d099019ff0406dfb328960b98/arch/ia64/sn/kernel/io_init.c
(mode:100644 sha1:29865445a2654c677ab2ebdb223b13b9edcba460)
@@ -23,6 +23,14 @@

nasid_t master_nasid = INVALID_NASID; /* Partition Master */

+static struct list_head sn_sysdata_list;
+
+/* sysdata list struct */
+struct sysdata_el {
+ struct list_head entry;
+ void *sysdata;
+};
+
struct slab_info {
struct hubdev_info hubdev;
};
@@ -137,23 +145,6 @@
}

/*
- * sn_alloc_pci_sysdata() - This routine allocates a pci controller
- * which is expected as the pci_dev and pci_bus sysdata by the Linux
- * PCI infrastructure.
- */
-static inline struct pci_controller *sn_alloc_pci_sysdata(void)
-{
- struct pci_controller *pci_sysdata;
-
- pci_sysdata = kmalloc(sizeof(*pci_sysdata), GFP_KERNEL);
- if (!pci_sysdata)
- BUG();
-
- memset(pci_sysdata, 0, sizeof(*pci_sysdata));
- return pci_sysdata;
-}
-
-/*
* sn_fixup_ionodes() - This routine initializes the HUB data strcuture for
* each node in the system.
*/
@@ -220,6 +211,15 @@

}

+void sn_pci_unfixup_slot(struct pci_dev *dev)
+{
+ struct pci_dev *host_pci_dev = SN_PCIDEV_INFO(dev)->host_pci_dev;
+
+ sn_irq_unfixup(dev);
+ pci_dev_put(host_pci_dev);
+ pci_dev_put(dev);
+}
+
/*
* sn_pci_fixup_slot() - This routine sets up a slot's resources
* consistent with the Linux PCI abstraction layer. Resources acquired
@@ -238,6 +238,7 @@
unsigned long size;
unsigned int bus_no, devfn;

+ pci_dev_get(dev); /* for the sysdata pointer */
dev->sysdata = kmalloc(sizeof(struct pcidev_info), GFP_KERNEL);
if (SN_PCIDEV_INFO(dev) <= 0)
BUG(); /* Cannot afford to run out of memory */
@@ -276,7 +277,8 @@
dev->resource[idx].parent = &iomem_resource;
}

- /* Using the PROMs values for the PCI host bus, get the Linux
+ /*
+ * Using the PROMs values for the PCI host bus, get the Linux
* PCI host_pci_dev struct and set up host bus linkages
*/

@@ -313,55 +315,57 @@
* sn_pci_controller_fixup() - This routine sets up a bus's resources
* consistent with the Linux PCI abstraction layer.
*/
-static void sn_pci_controller_fixup(int segment, int busnum)
+void sn_pci_controller_fixup(int segment, int busnum, struct pci_bus *bus)
{
int status = 0;
int nasid, cnode;
- struct pci_bus *bus;
struct pci_controller *controller;
struct pcibus_bussoft *prom_bussoft_ptr;
struct hubdev_info *hubdev_info;
void *provider_soft;
struct sn_pcibus_provider *provider;

- status - sal_get_pcibus_info((u64) segment, (u64) busnum,
- (u64) ia64_tpa(&prom_bussoft_ptr));
- if (status > 0) {
- return; /* bus # does not exist */
- }
-
+ status = sal_get_pcibus_info((u64) segment, (u64) busnum,
+ (u64) ia64_tpa(&prom_bussoft_ptr));
+ if (status > 0)
+ return; /*bus # does not exist */
prom_bussoft_ptr = __va(prom_bussoft_ptr);
- controller = sn_alloc_pci_sysdata();
- /* controller non-zero is BUG'd in sn_alloc_pci_sysdata */

- bus = pci_scan_bus(busnum, &pci_root_ops, controller);
+ controller = kcalloc(1,sizeof(struct pci_controller), GFP_KERNEL);
+ if (!controller)
+ BUG();
+
if (bus = NULL) {
- return; /* error, or bus already scanned */
+ bus = pci_scan_bus(busnum, &pci_root_ops, controller);
+ if (bus = NULL)
+ return; /* error, or bus already scanned */
+ bus->sysdata = NULL;
}

+ if (bus->sysdata)
+ goto error_return; /* sysdata already alloc'd */
+
/*
* Per-provider fixup. Copies the contents from prom to local
* area and links SN_PCIBUS_BUSSOFT().
*/

- if (prom_bussoft_ptr->bs_asic_type >= PCIIO_ASIC_MAX_TYPES) {
+ if (prom_bussoft_ptr->bs_asic_type >= PCIIO_ASIC_MAX_TYPES)
return; /* unsupported asic type */
- }
+
+ if (prom_bussoft_ptr->bs_asic_type = PCIIO_ASIC_TYPE_PPB)
+ goto error_return; /* no further fixup necessary */

provider = sn_pci_provider[prom_bussoft_ptr->bs_asic_type];
- if (provider = NULL) {
+ if (provider = NULL)
return; /* no provider registerd for this asic */
- }

provider_soft = NULL;
- if (provider->bus_fixup) {
+ if (provider->bus_fixup)
provider_soft = (*provider->bus_fixup) (prom_bussoft_ptr);
- }

- if (provider_soft = NULL) {
+ if (provider_soft = NULL)
return; /* fixup failed or not applicable */
- }

/*
* Generic bus fixup goes here. Don't reference prom_bussoft_ptr
@@ -370,12 +374,47 @@

bus->sysdata = controller;
PCI_CONTROLLER(bus)->platform_data = provider_soft;
-
nasid = NASID_GET(SN_PCIBUS_BUSSOFT(bus)->bs_base);
cnode = nasid_to_cnodeid(nasid);
hubdev_info = (struct hubdev_info *)(NODEPDA(cnode)->pdinfo);
SN_PCIBUS_BUSSOFT(bus)->bs_xwidget_info &(hubdev_info->hdi_xwidget_info[SN_PCIBUS_BUSSOFT(bus)->bs_xid]);
+
+ return;
+
+error_return:
+
+ kfree(controller);
+ return;
+}
+
+void sn_bus_store_sysdata(struct pci_dev *dev)
+{
+ struct sysdata_el *element;
+
+ element = kcalloc(1, sizeof(struct sysdata_el), GFP_KERNEL);
+ if (!element) {
+ dev_dbg(dev, "%s: out of memory!\n", __FUNCTION__);
+ return;
+ }
+ element->sysdata = dev->sysdata;
+ list_add(&element->entry, &sn_sysdata_list);
+}
+
+void sn_bus_free_sysdata(void)
+{
+ struct sysdata_el *element;
+ struct list_head *list;
+
+sn_sysdata_free_start:
+ list_for_each(list, &sn_sysdata_list) {
+ element = list_entry(list, struct sysdata_el, entry);
+ list_del(&element->entry);
+ kfree(element->sysdata);
+ kfree(element);
+ goto sn_sysdata_free_start;
+ }
+ return;
}

/*
@@ -413,15 +452,16 @@
ia64_max_iommu_merge_mask = ~PAGE_MASK;
sn_fixup_ionodes();
sn_irq_lh_init();
+ INIT_LIST_HEAD(&sn_sysdata_list);
sn_init_cpei_timer();

#ifdef CONFIG_PROC_FS
register_sn_procfs();
#endif

- for (i = 0; i < PCI_BUSES_TO_SCAN; i++) {
- sn_pci_controller_fixup(0, i);
- }
+ /* busses are not known yet ... */
+ for (i = 0; i < PCI_BUSES_TO_SCAN; i++)
+ sn_pci_controller_fixup(0, i, NULL);

/*
* Generic Linux PCI Layer has created the pci_bus and pci_dev
@@ -430,9 +470,8 @@
*/

while ((pci_dev - pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pci_dev)) != NULL) {
+ pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pci_dev)) != NULL)
sn_pci_fixup_slot(pci_dev);
- }

sn_ioif_inited = 1; /* sn I/O infrastructure now initialized */

@@ -474,3 +513,8 @@
}

subsys_initcall(sn_pci_init);
+EXPORT_SYMBOL(sn_pci_fixup_slot);
+EXPORT_SYMBOL(sn_pci_unfixup_slot);
+EXPORT_SYMBOL(sn_pci_controller_fixup);
+EXPORT_SYMBOL(sn_bus_store_sysdata);
+EXPORT_SYMBOL(sn_bus_free_sysdata);
Index: arch/ia64/sn/kernel/irq.c
=================================--- 94b3c225a19fb0e688da58fa7c9239db0a743e9c/arch/ia64/sn/kernel/irq.c
(mode:100644 sha1:ee4ac68d745f2c91e39d10e2f82cf624cf655edd)
+++ d42322aa13214a5d099019ff0406dfb328960b98/arch/ia64/sn/kernel/irq.c
(mode:100644 sha1:ec5e7a01c5b55f328e0dff8a45b012bc1024e84e)
@@ -284,7 +284,6 @@
int cpu = nasid_slice_to_cpuid(nasid, slice);

pci_dev_get(pci_dev);
-
sn_irq_info->irq_cpuid = cpu;
sn_irq_info->irq_pciioinfo = SN_PCIDEV_INFO(pci_dev);

@@ -305,15 +304,16 @@
return;

sn_irq_info = SN_PCIDEV_INFO(pci_dev)->pdi_sn_irq_info;
- if (!sn_irq_info || !sn_irq_info->irq_irq)
+ if (!sn_irq_info || !sn_irq_info->irq_irq) {
+ kfree(sn_irq_info);
return;
+ }

unregister_intr_pda(sn_irq_info);
spin_lock(&sn_irq_info_lock);
list_del_rcu(&sn_irq_info->list);
spin_unlock(&sn_irq_info_lock);
call_rcu(&sn_irq_info->rcu, sn_irq_info_free);
-
pci_dev_put(pci_dev);
}

Index: arch/ia64/sn/pci/pcibr/pcibr_provider.c
=================================---
94b3c225a19fb0e688da58fa7c9239db0a743e9c/arch/ia64/sn/pci/pcibr/pcibr_provider.c
(mode:100644 sha1:9bc4de4a3ec0778aa4724e75457bd253a6b1e45e)
+++
d42322aa13214a5d099019ff0406dfb328960b98/arch/ia64/sn/pci/pcibr/pcibr_provider.c
(mode:100644 sha1:9813da56d3113c41fb1b413cfa4c7963cda316cb)
@@ -18,6 +18,40 @@
#include "xtalk/xwidgetdev.h"
#include "xtalk/hubdev.h"

+int
+sal_pcibr_slot_enable(struct pcibus_info *soft, int device, void *resp)
+{
+ struct ia64_sal_retval ret_stuff;
+ uint64_t busnum;
+
+ ret_stuff.status = 0;
+ ret_stuff.v0 = 0;
+
+ busnum = soft->pbi_buscommon.bs_persist_busnum;
+ SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_SLOT_ENABLE, (u64) busnum,
+ (u64) device, (u64) resp, 0, 0, 0, 0);
+
+ return (int)ret_stuff.v0;
+}
+
+int
+sal_pcibr_slot_disable(struct pcibus_info *soft, int device, int action,
+ void *resp)
+{
+ struct ia64_sal_retval ret_stuff;
+ uint64_t busnum;
+
+ ret_stuff.status = 0;
+ ret_stuff.v0 = 0;
+
+ busnum = soft->pbi_buscommon.bs_persist_busnum;
+ SAL_CALL_NOLOCK(ret_stuff, (u64) SN_SAL_IOIF_SLOT_DISABLE,
+ (u64) busnum, (u64) device, (u64) action,
+ (u64) resp, 0, 0, 0);
+
+ return (int)ret_stuff.v0;
+}
+
static int sal_pcibr_error_interrupt(struct pcibus_info *soft)
{
struct ia64_sal_retval ret_stuff;
@@ -187,3 +221,6 @@

return 0;
}
+
+EXPORT_SYMBOL_GPL(sal_pcibr_slot_enable);
+EXPORT_SYMBOL_GPL(sal_pcibr_slot_disable);
Index: drivers/pci/hotplug/Kconfig
=================================--- 94b3c225a19fb0e688da58fa7c9239db0a743e9c/drivers/pci/hotplug/Kconfig
(mode:100644 sha1:1a4d4ca2a4dc386d3f63189ecc9cf30f806b947e)
+++ d42322aa13214a5d099019ff0406dfb328960b98/drivers/pci/hotplug/Kconfig
(mode:100644 sha1:9c4a39ee89b57b5065f575b86b2798ed31dc2fc6)
@@ -187,9 +187,10 @@

config HOTPLUG_PCI_SGI
tristate "SGI PCI Hotplug Support"
- depends on HOTPLUG_PCI && IA64_SGI_SN2
+ depends on HOTPLUG_PCI && (IA64_SGI_SN2 || IA64_GENERIC)
help
- Say Y here if you have an SGI IA64 Altix system.
+ Say Y here if you want to use the SGI Altix Hotplug
+ Driver for PCI devices.

When in doubt, say N.

Index: drivers/pci/hotplug/Makefile
=================================--- 94b3c225a19fb0e688da58fa7c9239db0a743e9c/drivers/pci/hotplug/Makefile
(mode:100644 sha1:93c120ddbd395f5ddeddcc3cc5d52bd31a47dcc4)
+++ d42322aa13214a5d099019ff0406dfb328960b98/drivers/pci/hotplug/Makefile
(mode:100644 sha1:24ed904514c5043095dfe484877dd38cdfa0f3b6)
@@ -14,6 +14,7 @@
obj-$(CONFIG_HOTPLUG_PCI_SHPC) += shpchp.o
obj-$(CONFIG_HOTPLUG_PCI_RPA) += rpaphp.o
obj-$(CONFIG_HOTPLUG_PCI_RPA_DLPAR) += rpadlpar_io.o
+obj-$(CONFIG_HOTPLUG_PCI_SGI) += sgi_hotplug.o

pci_hotplug-objs := pci_hotplug_core.o

Index: drivers/pci/hotplug/sgi_hotplug.c
=================================--- /dev/null (tree:94b3c225a19fb0e688da58fa7c9239db0a743e9c)
+++ d42322aa13214a5d099019ff0406dfb328960b98/drivers/pci/hotplug/sgi_hotplug.c
(mode:100644 sha1:323041fd41dc19c20ce88e4ae370272cbe09ea97)
@@ -0,0 +1,611 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2005 Silicon Graphics, Inc. All rights reserved.
+ *
+ * This work was based on the 2.4/2.6 kernel development by Dick Reigner.
+ * Work to add BIOS PROM support was completed by Mike Habeck.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/proc_fs.h>
+#include <linux/types.h>
+
+#include <asm/sn/addrs.h>
+#include <asm/sn/l1.h>
+#include <asm/sn/module.h>
+#include <asm/sn/pcibr_provider.h>
+#include <asm/sn/pcibus_provider_defs.h>
+#include <asm/sn/pcidev.h>
+#include <asm/sn/sn_sal.h>
+#include <asm/sn/types.h>
+
+#include "../pci.h"
+#include "pci_hotplug.h"
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("SGI (prarit@sgi.com, dickie@sgi.com, habeck@sgi.com)");
+MODULE_DESCRIPTION("SGI Altix Hot Plug PCI Controller Driver");
+
+#define PCIIO_ASIC_TYPE_TIOCA 4
+#define PCI_SLOT_ALREADY_UP 2 /* slot already up */
+#define PCI_SLOT_ALREADY_DOWN 3 /* slot already down */
+#define PCI_L1_ERR 7 /* L1 console command error */
+#define PCI_EMPTY_33MHZ 15 /* empty 33 MHz bus */
+#define PCI_L1_QSIZE 128 /* our L1 message buffer size */
+#define SN_MAX_HP_SLOTS 32 /* max number of hotplug slots */
+#define SGI_HOTPLUG_PROM_REV 0x0420 /* Min. required PROM version */
+
+/* internal list head */
+static struct list_head sn_hp_list;
+
+/* hotplug_slot struct's private pointer */
+struct slot {
+ int device_num;
+ struct pci_bus *pci_bus;
+ /* this struct for glue internal only */
+ struct hotplug_slot *hotplug_slot;
+ struct list_head hp_list;
+};
+
+struct pcibr_slot_enable_resp {
+ int resp_sub_errno;
+ char resp_l1_msg[PCI_L1_QSIZE + 1];
+};
+
+struct pcibr_slot_disable_resp {
+ int resp_sub_errno;
+ char resp_l1_msg[PCI_L1_QSIZE + 1];
+};
+
+enum sn_pci_req_e {
+ PCI_REQ_SLOT_ELIGIBLE,
+ PCI_REQ_SLOT_DISABLE
+};
+
+static int enable_slot(struct hotplug_slot *slot);
+static int disable_slot(struct hotplug_slot *slot);
+static int get_power_status(struct hotplug_slot *slot, u8 *value);
+
+static struct hotplug_slot_ops sn_hotplug_slot_ops = {
+ .owner = THIS_MODULE,
+ .enable_slot = enable_slot,
+ .disable_slot = disable_slot,
+ .get_power_status = get_power_status,
+};
+
+static DECLARE_MUTEX(sn_hotplug_sem);
+
+static int sn_pci_slot_valid(struct pci_bus *pci_bus, int device)
+{
+ struct pcibus_info *pcibus_info;
+ int bricktype;
+ int bus_num;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
+
+ /* Check to see if this is a valid slot on 'pci_bus' */
+ if (!(pcibus_info->pbi_valid_devices & (1 << device)))
+ return -EPERM;
+
+ bricktype = MODULE_GET_BTYPE(pcibus_info->pbi_moduleid);
+ bus_num = pcibus_info->pbi_buscommon.bs_persist_busnum & 0xf;
+
+ /* Do not allow hotplug operations on base I/O cards */
+ if ((bricktype = L1_BRICKTYPE_IX || bricktype = L1_BRICKTYPE_IA) &&
+ (bus_num = 1 && device != 1))
+ return -EPERM;
+
+ return 1;
+}
+
+static int sn_pci_bus_valid(struct pci_bus *pci_bus)
+{
+ struct pcibus_info *pcibus_info;
+ int asic_type;
+ int bricktype;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
+
+ /* Don't register slots hanging off the TIOCA bus */
+ asic_type = pcibus_info->pbi_buscommon.bs_asic_type;
+ if (asic_type = PCIIO_ASIC_TYPE_TIOCA)
+ return -EPERM;
+
+ /* Only register slots in I/O Bricks that support hotplug */
+ bricktype = MODULE_GET_BTYPE(pcibus_info->pbi_moduleid);
+ switch (bricktype) {
+ case L1_BRICKTYPE_IX:
+ case L1_BRICKTYPE_PX:
+ case L1_BRICKTYPE_IA:
+ case L1_BRICKTYPE_PA:
+ return 1;
+ break;
+ default:
+ return -EPERM;
+ break;
+ }
+
+ return -EIO;
+}
+
+static int sn_hp_slot_private_alloc(struct hotplug_slot *bss_hotplug_slot,
+ struct pci_bus *pci_bus, int device)
+{
+ struct pcibus_info *pcibus_info;
+ struct slot *slot;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(pci_bus);
+
+ bss_hotplug_slot->private = kcalloc(1, sizeof(struct slot),
+ GFP_KERNEL);
+ if (!bss_hotplug_slot->private)
+ return -ENOMEM;
+ slot = (struct slot *)bss_hotplug_slot->private;
+
+ bss_hotplug_slot->name = kmalloc(33, GFP_KERNEL);
+ if (!bss_hotplug_slot->name) {
+ kfree(bss_hotplug_slot->private);
+ return -ENOMEM;
+ }
+
+ slot->device_num = device;
+ slot->pci_bus = pci_bus;
+
+ sprintf(bss_hotplug_slot->name, "module_%c%c%c%c%.2d_b_%d_s_%d",
+ '0'+RACK_GET_CLASS(MODULE_GET_RACK(pcibus_info->pbi_moduleid)),
+ '0'+RACK_GET_GROUP(MODULE_GET_RACK(pcibus_info->pbi_moduleid)),
+ '0'+RACK_GET_NUM(MODULE_GET_RACK(pcibus_info->pbi_moduleid)),
+ MODULE_GET_BTCHAR(pcibus_info->pbi_moduleid),
+ MODULE_GET_BPOS(pcibus_info->pbi_moduleid),
+ ((int)pcibus_info->pbi_buscommon.bs_persist_busnum) & 0xf,
+ device + 1);
+
+ slot->hotplug_slot = bss_hotplug_slot;
+ list_add(&slot->hp_list, &sn_hp_list);
+
+ return 0;
+}
+
+static struct hotplug_slot * sn_hp_destroy(void)
+{
+ struct slot *slot;
+ struct list_head *list;
+ struct hotplug_slot *bss_hotplug_slot = NULL;
+
+ list_for_each(list, &sn_hp_list) {
+ slot = list_entry(list, struct slot, hp_list);
+ bss_hotplug_slot = slot->hotplug_slot;
+ list_del(&((struct slot *)bss_hotplug_slot->private)->
+ hp_list);
+ break;
+ }
+ return bss_hotplug_slot;
+}
+
+static void sn_bus_alloc_data(struct pci_dev *dev)
+{
+ struct list_head *node;
+ struct pci_bus *subordinate_bus;
+ struct pci_dev *child;
+
+ sn_pci_fixup_slot(dev);
+
+ /* Recursively sets up the sn_irq_info structs */
+ if (dev->subordinate) {
+ subordinate_bus = dev->subordinate;
+ list_for_each(node, &subordinate_bus->devices) {
+ child = list_entry(node, struct pci_dev, bus_list);
+ sn_bus_alloc_data(child);
+ }
+ }
+}
+
+static void sn_bus_free_data(struct pci_dev *dev)
+{
+ struct list_head *node;
+ struct pci_bus *subordinate_bus;
+ struct pci_dev *child;
+
+ /* Recursively clean up sn_irq_info structs */
+ if (dev->subordinate) {
+ subordinate_bus = dev->subordinate;
+ list_for_each(node, &subordinate_bus->devices) {
+ child = list_entry(node, struct pci_dev, bus_list);
+ sn_bus_free_data(child);
+ }
+ }
+ sn_pci_unfixup_slot(dev);
+}
+
+static u8 sn_power_status_get(struct hotplug_slot *bss_hotplug_slot)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+ u8 retval;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+ retval = pcibus_info->pbi_enabled_devices & (1 << slot->device_num);
+
+ return retval ? 1 : 0;
+}
+
+static void sn_slot_mark_enable(struct hotplug_slot *bss_hotplug_slot,
+ int device_num)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+ pcibus_info->pbi_enabled_devices |= (1 << device_num);
+}
+
+static void sn_slot_mark_disable(struct hotplug_slot *bss_hotplug_slot,
+ int device_num)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+ pcibus_info->pbi_enabled_devices &= ~(1 << device_num);
+}
+
+static int sn_slot_enable(struct hotplug_slot *bss_hotplug_slot,
+ int device_num)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+ struct pcibr_slot_enable_resp resp;
+ int rc;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+
+ /*
+ * Power-on and initialize the slot in the SN
+ * PCI infrastructure.
+ */
+ rc = sal_pcibr_slot_enable(pcibus_info, device_num, &resp);
+
+ if (rc = PCI_SLOT_ALREADY_UP) {
+ dev_dbg(slot->pci_bus->self, "is already active\n");
+ return -EPERM;
+ }
+
+ if (rc = PCI_L1_ERR) {
+ dev_dbg(slot->pci_bus->self,
+ "L1 failure %d with message: %s",
+ resp.resp_sub_errno, resp.resp_l1_msg);
+ return -EPERM;
+ }
+
+ if (rc) {
+ dev_dbg(slot->pci_bus->self,
+ "insert failed with error %d sub-error %d\n",
+ rc, resp.resp_sub_errno);
+ return -EIO;
+ }
+
+ sn_slot_mark_enable(bss_hotplug_slot, device_num);
+
+ return 0;
+}
+
+static int sn_slot_disable(struct hotplug_slot *bss_hotplug_slot,
+ int device_num, int action)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pcibus_info *pcibus_info;
+ struct pcibr_slot_disable_resp resp;
+ int rc;
+
+ pcibus_info = SN_PCIBUS_BUSSOFT_INFO(slot->pci_bus);
+
+ rc = sal_pcibr_slot_disable(pcibus_info, device_num, action, &resp);
+
+ if (action = PCI_REQ_SLOT_ELIGIBLE && rc = PCI_SLOT_ALREADY_DOWN) {
+ dev_dbg(slot->pci_bus->self, "Slot %s already inactive\n");
+ return -ENODEV;
+ }
+
+ if (action = PCI_REQ_SLOT_ELIGIBLE && rc = PCI_EMPTY_33MHZ) {
+ dev_dbg(slot->pci_bus->self,
+ "Cannot remove last 33MHz card\n");
+ return -EPERM;
+ }
+
+ if (action = PCI_REQ_SLOT_ELIGIBLE && rc = PCI_L1_ERR) {
+ dev_dbg(slot->pci_bus->self,
+ "L1 failure %d with message \n%s\n",
+ resp.resp_sub_errno, resp.resp_l1_msg);
+ return -EPERM;
+ }
+
+ if (action = PCI_REQ_SLOT_ELIGIBLE && rc) {
+ dev_dbg(slot->pci_bus->self,
+ "remove failed with error %d sub-error %d\n",
+ rc, resp.resp_sub_errno);
+ return -EIO;
+ }
+
+ if (action = PCI_REQ_SLOT_ELIGIBLE && !rc)
+ return 0;
+
+ if (action = PCI_REQ_SLOT_DISABLE && !rc) {
+ sn_slot_mark_disable(bss_hotplug_slot, device_num);
+ dev_dbg(slot->pci_bus->self, "remove successful\n");
+ return 0;
+ }
+
+ if (action = PCI_REQ_SLOT_DISABLE && rc) {
+ dev_dbg(slot->pci_bus->self,"remove failed rc = %d\n", rc);
+ return rc;
+ }
+
+ return rc;
+}
+
+static int enable_slot(struct hotplug_slot *bss_hotplug_slot)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pci_bus *new_bus = NULL;
+ struct pci_dev *dev;
+ int func, num_funcs;
+ int new_ppb = 0;
+ int rc;
+
+ /* Serialize the Linux PCI infrastructure */
+ down(&sn_hotplug_sem);
+
+ /*
+ * Power-on and initialize the slot in the SN
+ * PCI infrastructure.
+ */
+ rc = sn_slot_enable(bss_hotplug_slot, slot->device_num);
+ if (rc) {
+ up(&sn_hotplug_sem);
+ return rc;
+ }
+
+ num_funcs = pci_scan_slot(slot->pci_bus, PCI_DEVFN(slot->device_num+1,
+ PCI_FUNC(0)));
+ if (!num_funcs) {
+ dev_dbg(slot->pci_bus->self, "no device in slot\n");
+ up(&sn_hotplug_sem);
+ return -ENODEV;
+ }
+
+ sn_pci_controller_fixup(pci_domain_nr(slot->pci_bus),
+ slot->pci_bus->number,
+ slot->pci_bus);
+ /*
+ * Map SN resources for all functions on the card
+ * to the Linux PCI interface and tell the drivers
+ * about them.
+ */
+ for (func = 0; func < num_funcs; func++) {
+ dev = pci_get_slot(slot->pci_bus,
+ PCI_DEVFN(slot->device_num + 1,
+ PCI_FUNC(func)));
+
+
+ if (dev) {
+ if (dev->hdr_type = PCI_HEADER_TYPE_BRIDGE) {
+ unsigned char sec_bus;
+ pci_read_config_byte(dev, PCI_SECONDARY_BUS,
+ &sec_bus);
+ new_bus = pci_add_new_bus(dev->bus, dev,
+ sec_bus);
+ pci_scan_child_bus(new_bus);
+ sn_pci_controller_fixup(pci_domain_nr(new_bus),
+ new_bus->number,
+ new_bus);
+ new_ppb = 1;
+ }
+ sn_bus_alloc_data(dev);
+ pci_dev_put(dev);
+ }
+ }
+
+ /* Call the driver for the new device */
+ pci_bus_add_devices(slot->pci_bus);
+ /* Call the drivers for the new devices subordinate to PPB */
+ if (new_ppb)
+ pci_bus_add_devices(new_bus);
+
+ up(&sn_hotplug_sem);
+
+ if (rc = 0)
+ dev_dbg(slot->pci_bus->self,
+ "insert operation successful\n");
+ else
+ dev_dbg(slot->pci_bus->self,
+ "insert operation failed rc = %d\n", rc);
+
+ return rc;
+}
+
+static int disable_slot(struct hotplug_slot *bss_hotplug_slot)
+{
+ struct slot *slot = (struct slot *)bss_hotplug_slot->private;
+ struct pci_dev *dev;
+ int func;
+ int rc;
+
+ /* Acquire update access to the bus */
+ down(&sn_hotplug_sem);
+
+ /* is it okay to bring this slot down? */
+ rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
+ PCI_REQ_SLOT_ELIGIBLE);
+ if (rc)
+ goto leaving;
+
+ /* Free the SN resources assigned to the Linux device.*/
+ for (func = 0; func < 8; func++) {
+ dev = pci_get_slot(slot->pci_bus,
+ PCI_DEVFN(slot->device_num+1,
+ PCI_FUNC(func)));
+ if (dev) {
+ /*
+ * Some drivers may use dma accesses during the
+ * driver remove function. We release the sysdata
+ * areas after the driver remove functions have
+ * been called.
+ */
+ sn_bus_store_sysdata(dev);
+ sn_bus_free_data(dev);
+ pci_remove_bus_device(dev);
+ pci_dev_put(dev);
+ }
+ }
+
+ /* free the collected sysdata pointers */
+ sn_bus_free_sysdata();
+
+ /* Deactivate slot */
+ rc = sn_slot_disable(bss_hotplug_slot, slot->device_num,
+ PCI_REQ_SLOT_DISABLE);
+ leaving:
+ /* Release the bus lock */
+ up(&sn_hotplug_sem);
+
+ return rc;
+}
+
+static int get_power_status(struct hotplug_slot *bss_hotplug_slot, u8 *value)
+{
+ down(&sn_hotplug_sem);
+ *value = sn_power_status_get(bss_hotplug_slot);
+ up(&sn_hotplug_sem);
+ return 0;
+}
+
+static void sn_release_slot(struct hotplug_slot *bss_hotplug_slot)
+{
+ kfree(bss_hotplug_slot->info);
+ kfree(bss_hotplug_slot->name);
+ kfree(bss_hotplug_slot->private);
+ kfree(bss_hotplug_slot);
+}
+
+static int sn_hotplug_slot_register(struct pci_bus *pci_bus)
+{
+ int device;
+ struct hotplug_slot *bss_hotplug_slot;
+ int rc = 0;
+
+ /*
+ * Currently only four devices are supported,
+ * in the future there maybe more -- up to 32.
+ */
+
+ for (device = 0; device < SN_MAX_HP_SLOTS ; device++) {
+ if (sn_pci_slot_valid(pci_bus, device) != 1)
+ continue;
+
+ bss_hotplug_slot = kcalloc(1,sizeof(struct hotplug_slot),
+ GFP_KERNEL);
+ if (!bss_hotplug_slot) {
+ rc = -ENOMEM;
+ goto alloc_err;
+ }
+
+ bss_hotplug_slot->info + kcalloc(1,sizeof(struct hotplug_slot_info),
+ GFP_KERNEL);
+ if (!bss_hotplug_slot->info) {
+ rc = -ENOMEM;
+ goto alloc_err;
+ }
+
+ if (sn_hp_slot_private_alloc(bss_hotplug_slot,
+ pci_bus, device)) {
+ rc = -ENOMEM;
+ goto alloc_err;
+ }
+
+ bss_hotplug_slot->ops = &sn_hotplug_slot_ops;
+ bss_hotplug_slot->release = &sn_release_slot;
+
+ rc = pci_hp_register(bss_hotplug_slot);
+ if (rc)
+ goto register_err;
+ }
+ dev_dbg(pci_bus->self, "Registered bus with hotplug\n");
+ return rc;
+
+register_err:
+ dev_dbg(pci_bus->self, "bus failed to register with err = %d\n",
+ rc);
+
+alloc_err:
+ if (rc = -ENOMEM)
+ dev_dbg(pci_bus->self, "Memory allocation error\n");
+
+ /* destroy THIS element */
+ if (bss_hotplug_slot)
+ sn_release_slot(bss_hotplug_slot);
+
+ /* destroy anything else on the list */
+ while ((bss_hotplug_slot = sn_hp_destroy()))
+ pci_hp_deregister(bss_hotplug_slot);
+
+ return rc;
+}
+
+static int sn_pci_hotplug_init(void)
+{
+ struct pci_bus *pci_bus = NULL;
+ int rc;
+ int registered = 0;
+
+ INIT_LIST_HEAD(&sn_hp_list);
+
+ if (sn_sal_rev() < SGI_HOTPLUG_PROM_REV) {
+ printk(KERN_ERR "%s: PROM version must be greater than 4.05\n",
+ __FUNCTION__);
+ return -EPERM;
+ }
+
+ while ((pci_bus = pci_find_next_bus(pci_bus))) {
+ if (!pci_bus->sysdata)
+ continue;
+
+ rc = sn_pci_bus_valid(pci_bus);
+ if (rc != 1) {
+ dev_dbg(pci_bus->self, "not a valid hotplug bus\n");
+ continue;
+ }
+ dev_dbg(pci_bus->self, "valid hotplug bus\n");
+
+ rc = sn_hotplug_slot_register(pci_bus);
+ if (!rc)
+ registered = 1;
+ else {
+ registered = 0;
+ break;
+ }
+ }
+
+ return registered = 1 ? 0 : -ENODEV;
+}
+
+static void sn_pci_hotplug_exit(void)
+{
+ struct hotplug_slot *bss_hotplug_slot;
+
+ while ((bss_hotplug_slot = sn_hp_destroy())) {
+ pci_hp_deregister(bss_hotplug_slot);
+ }
+
+ if (!list_empty(&sn_hp_list))
+ printk(KERN_ERR "%s: internal list is not empty\n", __FILE__);
+}
+
+module_init(sn_pci_hotplug_init);
+module_exit(sn_pci_hotplug_exit);
Index: include/asm-ia64/sn/pcibr_provider.h
=================================---
94b3c225a19fb0e688da58fa7c9239db0a743e9c/include/asm-ia64/sn/pcibr_provider.h
(mode:100644 sha1:0abf539cb0414d752fcf14d9318bf1fa00278d32)
+++
d42322aa13214a5d099019ff0406dfb328960b98/include/asm-ia64/sn/pcibr_provider.h
(mode:100644 sha1:c1bf22505ff339ea7a5255ec9a8a60031397e9a8)
@@ -151,4 +151,8 @@
extern int pcibr_ate_alloc(struct pcibus_info *, int);
extern void pcibr_ate_free(struct pcibus_info *, int);
extern void ate_write(struct pcibus_info *, int, int, uint64_t);
+extern int sal_pcibr_slot_enable(struct pcibus_info *soft, int device,
+ void *resp);
+extern int sal_pcibr_slot_disable(struct pcibus_info *soft, int device,
+ int action, void *resp);
#endif
Index: include/asm-ia64/sn/pcidev.h
=================================--- 94b3c225a19fb0e688da58fa7c9239db0a743e9c/include/asm-ia64/sn/pcidev.h
(mode:100644 sha1:9610fcc635450e57bf9be693fb8fa5e22eb60be1)
+++ d42322aa13214a5d099019ff0406dfb328960b98/include/asm-ia64/sn/pcidev.h
(mode:100644 sha1:49711d00ad04f77d90467daf33bfd13d549e2109)
@@ -23,6 +23,8 @@
#define SN_PCIBUS_BUSSOFT(pci_bus) \
((struct pcibus_bussoft *)(PCI_CONTROLLER((pci_bus))->platform_data))

+#define SN_PCIBUS_BUSSOFT_INFO(pci_bus) \
+ (struct pcibus_info *)((struct pcibus_bussoft
*)(PCI_CONTROLLER((pci_bus))->platform_data))
/*
* Given a struct pci_dev, return the sn pcibus_bussoft struct. Note
* that this is not equivalent to SN_PCIBUS_BUSSOFT(pci_dev->bus) due
@@ -56,6 +58,10 @@
extern void sn_irq_fixup(struct pci_dev *pci_dev,
struct sn_irq_info *sn_irq_info);
extern void sn_irq_unfixup(struct pci_dev *pci_dev);
+extern void sn_pci_controller_fixup(int segment, int busnum,
+ struct pci_bus *bus);
+extern void sn_bus_store_sysdata(struct pci_dev *dev);
+extern void sn_bus_free_sysdata(void);
extern void sn_pci_fixup_slot(struct pci_dev *dev);
extern void sn_pci_unfixup_slot(struct pci_dev *dev);
extern void sn_irq_lh_init(void);