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Date: Thu, 31 Jul 2008 19:32:30 +0900
From: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
To: Alex Chiang <achiang@...com>,
Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>,
Matthew Wilcox <matthew@....cx>,
Pierre Ossman <drzeus-list@...eus.cx>,
Jesse Barnes <jbarnes@...tuousgeek.org>,
LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org
Subject: Re: [PATCH 1/2] pciehp: Rename duplicate slot name N as N-1, N-2,
N-M...
Tested-by & Acked-by: Kenji Kaneshige <kaneshige.kenji@...fujitsu.com>
Thnaks,
Kenji Kaneshige
Alex Chiang wrote:
> Commit 3800345f723fd130d50434d4717b99d4a9f383c8 introduces the
> pciehp_slot_with_bus module parameter, which was intended to help
> work around broken firmware that assigns the same name to multiple
> slots.
>
> Commit 9e4f2e8d4ddb04ad16a3828cd9a369a5a5287009 tells the user to
> use the above parameter in the event of a name collision.
>
> This approach is sub-optimal because it requires too much work from
> the user.
>
> Instead, let's rename the slot on behalf of the user. If firmware
> assigns the name N to multiple slots, then:
>
> The first registered slot is assigned N
> The second registered slot is assigned N-1
> The third registered slot is assigned N-2
> The Mth registered slot becomes N-M
>
> In the event we overflow the slot->name parameter, we report an
> error to the user.
>
> Signed-off-by: Alex Chiang <achiang@...com>
> ---
> drivers/pci/hotplug/pciehp.h | 1 -
> drivers/pci/hotplug/pciehp_core.c | 21 ++++++++++++++-------
> drivers/pci/hotplug/pciehp_hpc.c | 11 +----------
> 3 files changed, 15 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/pci/hotplug/pciehp.h b/drivers/pci/hotplug/pciehp.h
> index e3a1e7e..9e6cec6 100644
> --- a/drivers/pci/hotplug/pciehp.h
> +++ b/drivers/pci/hotplug/pciehp.h
> @@ -43,7 +43,6 @@ extern int pciehp_poll_mode;
> extern int pciehp_poll_time;
> extern int pciehp_debug;
> extern int pciehp_force;
> -extern int pciehp_slot_with_bus;
> extern struct workqueue_struct *pciehp_wq;
>
> #define dbg(format, arg...) \
> diff --git a/drivers/pci/hotplug/pciehp_core.c b/drivers/pci/hotplug/pciehp_core.c
> index 3677495..4fd5355 100644
> --- a/drivers/pci/hotplug/pciehp_core.c
> +++ b/drivers/pci/hotplug/pciehp_core.c
> @@ -41,7 +41,6 @@ int pciehp_debug;
> int pciehp_poll_mode;
> int pciehp_poll_time;
> int pciehp_force;
> -int pciehp_slot_with_bus;
> struct workqueue_struct *pciehp_wq;
>
> #define DRIVER_VERSION "0.4"
> @@ -56,12 +55,10 @@ module_param(pciehp_debug, bool, 0644);
> module_param(pciehp_poll_mode, bool, 0644);
> module_param(pciehp_poll_time, int, 0644);
> module_param(pciehp_force, bool, 0644);
> -module_param(pciehp_slot_with_bus, bool, 0644);
> MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
> MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
> MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
> MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if _OSC and OSHP are missing");
> -MODULE_PARM_DESC(pciehp_slot_with_bus, "Use bus number in the slot name");
>
> #define PCIE_MODULE_NAME "pciehp"
>
> @@ -194,6 +191,7 @@ static int init_slots(struct controller *ctrl)
> struct slot *slot;
> struct hotplug_slot *hotplug_slot;
> struct hotplug_slot_info *info;
> + int len, dup = 1;
> int retval = -ENOMEM;
>
> list_for_each_entry(slot, &ctrl->slot_list, slot_list) {
> @@ -220,15 +218,24 @@ static int init_slots(struct controller *ctrl)
> dbg("Registering bus=%x dev=%x hp_slot=%x sun=%x "
> "slot_device_offset=%x\n", slot->bus, slot->device,
> slot->hp_slot, slot->number, ctrl->slot_device_offset);
> +duplicate_name:
> retval = pci_hp_register(hotplug_slot,
> ctrl->pci_dev->subordinate,
> slot->device);
> if (retval) {
> + /*
> + * If slot N already exists, we'll try to create
> + * slot N-1, N-2 ... N-M, until we overflow.
> + */
> + if (retval == -EEXIST) {
> + len = snprintf(slot->name, SLOT_NAME_SIZE,
> + "%d-%d", slot->number, dup++);
> + if (len < SLOT_NAME_SIZE)
> + goto duplicate_name;
> + else
> + err("duplicate slot name overflow\n");
> + }
> err("pci_hp_register failed with error %d\n", retval);
> - if (retval == -EEXIST)
> - err("Failed to register slot because of name "
> - "collision. Try \'pciehp_slot_with_bus\' "
> - "module option.\n");
> goto error_info;
> }
> /* create additional sysfs entries */
> diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
> index ad27e9e..ab31f5b 100644
> --- a/drivers/pci/hotplug/pciehp_hpc.c
> +++ b/drivers/pci/hotplug/pciehp_hpc.c
> @@ -1030,15 +1030,6 @@ static void pcie_shutdown_notification(struct controller *ctrl)
> pciehp_free_irq(ctrl);
> }
>
> -static void make_slot_name(struct slot *slot)
> -{
> - if (pciehp_slot_with_bus)
> - snprintf(slot->name, SLOT_NAME_SIZE, "%04d_%04d",
> - slot->bus, slot->number);
> - else
> - snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number);
> -}
> -
> static int pcie_init_slot(struct controller *ctrl)
> {
> struct slot *slot;
> @@ -1053,7 +1044,7 @@ static int pcie_init_slot(struct controller *ctrl)
> slot->device = ctrl->slot_device_offset + slot->hp_slot;
> slot->hpc_ops = ctrl->hpc_ops;
> slot->number = ctrl->first_slot;
> - make_slot_name(slot);
> + snprintf(slot->name, SLOT_NAME_SIZE, "%d", slot->number);
> mutex_init(&slot->lock);
> INIT_DELAYED_WORK(&slot->work, pciehp_queue_pushbutton_work);
> list_add(&slot->slot_list, &ctrl->slot_list);
--
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