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// SPDX-License-Identifier: GPL-2.0
/*
* SCLP Store Data support and sysfs interface
*
* Copyright IBM Corp. 2017
*/
#define KMSG_COMPONENT "sclp_sd"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/completion.h>
#include <linux/kobject.h>
#include <linux/list.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/async.h>
#include <linux/export.h>
#include <linux/mutex.h>
#include <asm/pgalloc.h>
#include "sclp.h"
#define SD_EQ_STORE_DATA 0
#define SD_EQ_HALT 1
#define SD_EQ_SIZE 2
#define SD_DI_CONFIG 3
struct sclp_sd_evbuf {
struct evbuf_header hdr;
u8 eq;
u8 di;
u8 rflags;
u64 :56;
u32 id;
u16 :16;
u8 fmt;
u8 status;
u64 sat;
u64 sa;
u32 esize;
u32 dsize;
} __packed;
struct sclp_sd_sccb {
struct sccb_header hdr;
struct sclp_sd_evbuf evbuf;
} __packed __aligned(PAGE_SIZE);
/**
* struct sclp_sd_data - Result of a Store Data request
* @esize_bytes: Resulting esize in bytes
* @dsize_bytes: Resulting dsize in bytes
* @data: Pointer to data - must be released using vfree()
*/
struct sclp_sd_data {
size_t esize_bytes;
size_t dsize_bytes;
void *data;
};
/**
* struct sclp_sd_listener - Listener for asynchronous Store Data response
* @list: For enqueueing this struct
* @id: Event ID of response to listen for
* @completion: Can be used to wait for response
* @evbuf: Contains the resulting Store Data response after completion
*/
struct sclp_sd_listener {
struct list_head list;
u32 id;
struct completion completion;
struct sclp_sd_evbuf evbuf;
};
/**
* struct sclp_sd_file - Sysfs representation of a Store Data entity
* @kobj: Kobject
* @data_attr: Attribute for accessing data contents
* @data_mutex: Mutex to serialize access and updates to @data
* @data: Data associated with this entity
* @di: DI value associated with this entity
*/
struct sclp_sd_file {
struct kobject kobj;
struct bin_attribute data_attr;
struct mutex data_mutex;
struct sclp_sd_data data;
u8 di;
};
#define to_sd_file(x) container_of(x, struct sclp_sd_file, kobj)
static struct kset *sclp_sd_kset;
static struct sclp_sd_file *config_file;
static LIST_HEAD(sclp_sd_queue);
static DEFINE_SPINLOCK(sclp_sd_queue_lock);
/**
* sclp_sd_listener_add() - Add listener for Store Data responses
* @listener: Listener to add
*/
static void sclp_sd_listener_add(struct sclp_sd_listener *listener)
{
spin_lock_irq(&sclp_sd_queue_lock);
list_add_tail(&listener->list, &sclp_sd_queue);
spin_unlock_irq(&sclp_sd_queue_lock);
}
/**
* sclp_sd_listener_remove() - Remove listener for Store Data responses
* @listener: Listener to remove
*/
static void sclp_sd_listener_remove(struct sclp_sd_listener *listener)
{
spin_lock_irq(&sclp_sd_queue_lock);
list_del(&listener->list);
spin_unlock_irq(&sclp_sd_queue_lock);
}
/**
* sclp_sd_listener_init() - Initialize a Store Data response listener
* @id: Event ID to listen for
*
* Initialize a listener for asynchronous Store Data responses. This listener
* can afterwards be used to wait for a specific response and to retrieve
* the associated response data.
*/
static void sclp_sd_listener_init(struct sclp_sd_listener *listener, u32 id)
{
memset(listener, 0, sizeof(*listener));
listener->id = id;
init_completion(&listener->completion);
}
/**
* sclp_sd_receiver() - Receiver for Store Data events
* @evbuf_hdr: Header of received events
*
* Process Store Data events and complete listeners with matching event IDs.
*/
static void sclp_sd_receiver(struct evbuf_header *evbuf_hdr)
{
struct sclp_sd_evbuf *evbuf = (struct sclp_sd_evbuf *) evbuf_hdr;
struct sclp_sd_listener *listener;
int found = 0;
pr_debug("received event (id=0x%08x)\n", evbuf->id);
spin_lock(&sclp_sd_queue_lock);
list_for_each_entry(listener, &sclp_sd_queue, list) {
if (listener->id != evbuf->id)
continue;
listener->evbuf = *evbuf;
complete(&listener->completion);
found = 1;
break;
}
spin_unlock(&sclp_sd_queue_lock);
if (!found)
pr_debug("unsolicited event (id=0x%08x)\n", evbuf->id);
}
static struct sclp_register sclp_sd_register = {
.send_mask = EVTYP_STORE_DATA_MASK,
.receive_mask = EVTYP_STORE_DATA_MASK,
.receiver_fn = sclp_sd_receiver,
};
/**
* sclp_sd_sync() - Perform Store Data request synchronously
* @page: Address of work page - must be below 2GB
* @eq: Input EQ value
* @di: Input DI value
* @sat: Input SAT value
* @sa: Input SA value used to specify the address of the target buffer
* @dsize_ptr: Optional pointer to input and output DSIZE value
* @esize_ptr: Optional pointer to output ESIZE value
*
* Perform Store Data request with specified parameters and wait for completion.
*
* Return %0 on success and store resulting DSIZE and ESIZE values in
* @dsize_ptr and @esize_ptr (if provided). Return non-zero on error.
*/
static int sclp_sd_sync(unsigned long page, u8 eq, u8 di, u64 sat, u64 sa,
u32 *dsize_ptr, u32 *esize_ptr)
{
struct sclp_sd_sccb *sccb = (void *) page;
struct sclp_sd_listener listener;
struct sclp_sd_evbuf *evbuf;
int rc;
sclp_sd_listener_init(&listener, (u32) (addr_t) sccb);
sclp_sd_listener_add(&listener);
/* Prepare SCCB */
memset(sccb, 0, PAGE_SIZE);
sccb->hdr.length = sizeof(sccb->hdr) + sizeof(sccb->evbuf);
evbuf = &sccb->evbuf;
evbuf->hdr.length = sizeof(*evbuf);
evbuf->hdr.type = EVTYP_STORE_DATA;
evbuf->eq = eq;
evbuf->di = di;
evbuf->id = listener.id;
evbuf->fmt = 1;
evbuf->sat = sat;
evbuf->sa = sa;
if (dsize_ptr)
evbuf->dsize = *dsize_ptr;
/* Perform command */
pr_debug("request (eq=%d, di=%d, id=0x%08x)\n", eq, di, listener.id);
rc = sclp_sync_request(SCLP_CMDW_WRITE_EVENT_DATA, sccb);
pr_debug("request done (rc=%d)\n", rc);
if (rc)
goto out;
/* Evaluate response */
if (sccb->hdr.response_code == 0x73f0) {
pr_debug("event not supported\n");
rc = -EIO;
goto out_remove;
}
if (sccb->hdr.response_code != 0x0020 || !(evbuf->hdr.flags & 0x80)) {
rc = -EIO;
goto out;
}
if (!(evbuf->rflags & 0x80)) {
rc = wait_for_completion_interruptible(&listener.completion);
if (rc)
goto out;
evbuf = &listener.evbuf;
}
switch (evbuf->status) {
case 0:
if (dsize_ptr)
*dsize_ptr = evbuf->dsize;
if (esize_ptr)
*esize_ptr = evbuf->esize;
pr_debug("success (dsize=%u, esize=%u)\n", evbuf->dsize,
evbuf->esize);
break;
case 3:
rc = -ENOENT;
break;
default:
rc = -EIO;
break;
}
out:
if (rc && rc != -ENOENT) {
/* Provide some information about what went wrong */
pr_warn("Store Data request failed (eq=%d, di=%d, "
"response=0x%04x, flags=0x%02x, status=%d, rc=%d)\n",
eq, di, sccb->hdr.response_code, evbuf->hdr.flags,
evbuf->status, rc);
}
out_remove:
sclp_sd_listener_remove(&listener);
return rc;
}
/**
* sclp_sd_store_data() - Obtain data for specified Store Data entity
* @result: Resulting data
* @di: DI value associated with this entity
*
* Perform a series of Store Data requests to obtain the size and contents of
* the specified Store Data entity.
*
* Return:
* %0: Success - result is stored in @result. @result->data must be
* released using vfree() after use.
* %-ENOENT: No data available for this entity
* %<0: Other error
*/
static int sclp_sd_store
|