These are better, I'm ok with the other patches (well, I didn't review
the ACPI changes, but I know little about that).
You do have the refcounting stuff wrong, though. You only need a
refcount if you receive a pointer to the information. For instance, you
would have:
int ipmi_get_smi_info(int if_num, enum ipmi_addr_src type,
struct ipmi_smi_info **data);
and
void ipmi_put_smi_info(struct ipmi_smi_info *data);
The way you are doing it, there is no need for a refcount, since you are
making a copy of the data.
Is a copy or a pointer better? A pointer is generally preferred, it
keeps from having to either store data on the stack or dynamically
allocate it for the copy. But it's not a huge deal in this case. A
pointer will require you to dynamically allocate the smi_info structure
so you can free it separately. But then only the top-level put routine
is required, it can simply free the structure if the refcount is zero.
-corey
On 10/12/2010 02:47 AM, [email protected] wrote:
> From: Zhao Yakui<[email protected]>
>
> The IPMI smi_watcher will be used to catch the IPMI interface as they come or
> go.
> In order to communicate with the correct IPMI device, it should be confirmed
> whether it is what we wanted especially on the system with multiple IPMI
> devices. But the new_smi callback function of smi_watcher provides very
> limited info(only the interface number and dev pointer) and there is no
> detailed info about the low level interface. For example: which mechansim
> registers the IPMI interface(ACPI, PCI, DMI and so on).
>
> This is to add one interface that can get more info of low-level IPMI
> device. For example: the ACPI device handle will be returned for the pnp_acpi
> IPMI device.
>
> Signed-off-by: Zhao Yakui<[email protected]>
> ---
> In this patch only the info of pnp_acpi IPMI is provided. If the detailed info
> is also required for other mechanism, please add them in the structure of
> ipmi_smi_info.
>
> drivers/char/ipmi/ipmi_msghandler.c | 47
> +++++++++++++++++++++++++++++++++++
> drivers/char/ipmi/ipmi_si_intf.c | 35 +++++++++++++++++++++++---
> include/linux/ipmi.h | 25 ++++++++++++++++++
> include/linux/ipmi_smi.h | 12 +++++++++
> 4 files changed, 115 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_msghandler.c
> b/drivers/char/ipmi/ipmi_msghandler.c
> index 4f3f8c9..29e373d 100644
> --- a/drivers/char/ipmi/ipmi_msghandler.c
> +++ b/drivers/char/ipmi/ipmi_msghandler.c
> @@ -970,6 +970,53 @@ out_kfree:
> }
> EXPORT_SYMBOL(ipmi_create_user);
>
> +int ipmi_get_smi_info(int if_num, enum ipmi_addr_src type,
> + struct ipmi_smi_info *data)
> +{
> + int rv = 0;
> + ipmi_smi_t intf;
> + struct ipmi_smi_handlers *handlers;
> +
> + mutex_lock(&ipmi_interfaces_mutex);
> + list_for_each_entry_rcu(intf,&ipmi_interfaces, link) {
> + if (intf->intf_num == if_num)
> + goto found;
> + }
> + /* Not found, return an error */
> + rv = -EINVAL;
> + mutex_unlock(&ipmi_interfaces_mutex);
> + return rv;
> +
> +found:
> + handlers = intf->handlers;
> + rv = handlers->get_smi_info(intf->send_info, type, data);
> + mutex_unlock(&ipmi_interfaces_mutex);
> +
> + return rv;
> +}
> +EXPORT_SYMBOL(ipmi_get_smi_info);
> +
> +void ipmi_put_smi_info(int if_num)
> +{
> + ipmi_smi_t intf;
> + struct ipmi_smi_handlers *handlers;
> +
> + mutex_lock(&ipmi_interfaces_mutex);
> + list_for_each_entry_rcu(intf,&ipmi_interfaces, link) {
> + if (intf->intf_num == if_num)
> + goto found;
> + }
> + /* Not found, return */
> + mutex_unlock(&ipmi_interfaces_mutex);
> + return;
> +
> +found:
> + handlers = intf->handlers;
> + handlers->put_smi_info(intf->send_info);
> + mutex_unlock(&ipmi_interfaces_mutex);
> +}
> +EXPORT_SYMBOL(ipmi_put_smi_info);
> +
> static void free_user(struct kref *ref)
> {
> ipmi_user_t user = container_of(ref, struct ipmi_user, refcount);
> diff --git a/drivers/char/ipmi/ipmi_si_intf.c
> b/drivers/char/ipmi/ipmi_si_intf.c
> index 7bd7c45..4885709 100644
> --- a/drivers/char/ipmi/ipmi_si_intf.c
> +++ b/drivers/char/ipmi/ipmi_si_intf.c
> @@ -57,6 +57,7 @@
> #include<asm/irq.h>
> #include<linux/interrupt.h>
> #include<linux/rcupdate.h>
> +#include<linux/ipmi.h>
> #include<linux/ipmi_smi.h>
> #include<asm/io.h>
> #include "ipmi_si_sm.h"
> @@ -107,10 +108,6 @@ enum si_type {
> };
> static char *si_to_str[] = { "kcs", "smic", "bt" };
>
> -enum ipmi_addr_src {
> - SI_INVALID = 0, SI_HOTMOD, SI_HARDCODED, SI_SPMI, SI_ACPI, SI_SMBIOS,
> - SI_PCI, SI_DEVICETREE, SI_DEFAULT
> -};
> static char *ipmi_addr_src_to_str[] = { NULL, "hotmod", "hardcoded", "SPMI",
> "ACPI", "SMBIOS", "PCI",
> "device-tree", "default" };
> @@ -291,6 +288,7 @@ struct smi_info {
> struct task_struct *thread;
>
> struct list_head link;
> + struct ipmi_smi_info smi_data;
> };
>
> #define smi_inc_stat(smi, stat) \
> @@ -1186,6 +1184,31 @@ static int smi_start_processing(void *send_info,
> return 0;
> }
>
> +static int get_smi_info(void *send_info,
> + enum ipmi_addr_src type,
> + struct ipmi_smi_info *data)
> +{
> + struct smi_info *new_smi = send_info;
> + struct ipmi_smi_info *smi_data =&new_smi->smi_data;
> +
> + if (new_smi->addr_source != type)
> + return -EINVAL;
> +
> + get_device(new_smi->dev);
> + memcpy(data, smi_data, sizeof(*smi_data));
> + smi_data->addr_src = type;
> + smi_data->dev = new_smi->dev;
> +
> + return 0;
> +}
> +
> +static void put_smi_info(void *send_info)
> +{
> + struct smi_info *new_smi = send_info;
> +
> + put_device(new_smi->dev);
> +}
> +
> static void set_maintenance_mode(void *send_info, int enable)
> {
> struct smi_info *smi_info = send_info;
> @@ -1197,6 +1220,8 @@ static void set_maintenance_mode(void *send_info, int
> enable)
> static struct ipmi_smi_handlers handlers = {
> .owner = THIS_MODULE,
> .start_processing = smi_start_processing,
> + .get_smi_info = get_smi_info,
> + .put_smi_info = put_smi_info,
> .sender = sender,
> .request_events = request_events,
> .set_maintenance_mode = set_maintenance_mode,
> @@ -2143,6 +2168,8 @@ static int __devinit ipmi_pnp_probe(struct pnp_dev *dev,
> return -ENOMEM;
>
> info->addr_source = SI_ACPI;
> + info->smi_data.smi_info.acpi_info.acpi_handle =
> + acpi_dev->handle;
> printk(KERN_INFO PFX "probing via ACPI\n");
>
> handle = acpi_dev->handle;
> diff --git a/include/linux/ipmi.h b/include/linux/ipmi.h
> index 65aae34..2d30551 100644
> --- a/include/linux/ipmi.h
> +++ b/include/linux/ipmi.h
> @@ -454,6 +454,31 @@ unsigned int ipmi_addr_length(int addr_type);
> /* Validate that the given IPMI address is valid. */
> int ipmi_validate_addr(struct ipmi_addr *addr, int len);
>
> +enum ipmi_addr_src {
> + SI_INVALID = 0, SI_HOTMOD, SI_HARDCODED, SI_SPMI, SI_ACPI, SI_SMBIOS,
> + SI_PCI, SI_DEVICETREE, SI_DEFAULT
> +};
> +struct ipmi_smi_info{
> + enum ipmi_addr_src addr_src;
> + struct device *dev;
> + union {
> + /*
> + * Now only SI_ACPI info is provided. If the info is required
> + * for other type, please add it
> + */
> +#ifdef CONFIG_ACPI
> + struct {
> + void *acpi_handle;
> + } acpi_info;
> +#endif
> + } smi_info;
> +};
> +
> +/* This is to get the private info of ipmi_smi_t */
> +extern int ipmi_get_smi_info(int if_num, enum ipmi_addr_src type,
> + struct ipmi_smi_info *data);
> +/* This is to decrease refcount added in the function of ipmi_get_smi_info */
> +extern void ipmi_put_smi_info(int if_num);
> #endif /* __KERNEL__ */
>
>
> diff --git a/include/linux/ipmi_smi.h b/include/linux/ipmi_smi.h
> index 4b48318..b9a53c0 100644
> --- a/include/linux/ipmi_smi.h
> +++ b/include/linux/ipmi_smi.h
> @@ -86,6 +86,18 @@ struct ipmi_smi_handlers {
> int (*start_processing)(void *send_info,
> ipmi_smi_t new_intf);
>
> + /*
> + * Get the detailed private info of the low level interface and store
> + * it into the structure of ipmi_smi_data. For example: the
> + * ACPI device handle will be returned for the pnp_acpi IPMI device.
> + * Of course it will firstly compare the interface type of low-level
> + * interface(Hardcoded type, DMI, ACPI and so on). If the type doesn't
> + * match, it will return -EINVAL.
> + */
> + int (*get_smi_info)(void *send_info, enum ipmi_addr_src type,
> + struct ipmi_smi_info *data);
> +
> + void (*put_smi_info)(void *send_info);
> /* Called to enqueue an SMI message to be sent. This
> operation is not allowed to fail. If an error occurs, it
> should report back the error in a received message. It may
>
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