Changeset eb522e8 in mainline for uspace/app/klog/klog.c

Timestamp:

2011-06-01T08:43:42Z (15 years ago)

Author:

Lubos Slovak <lubos.slovak@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

8d6c1f1

Parents:

9e2e715 (diff), e51a514 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Huuuuuge merge from development - all the work actually

File:

• uspace/app/klog/klog.c (modified) (2 diffs)

uspace/app/klog/klog.c

@@ -36 +36 @@
 
 #include <stdio.h>
-#include <ipc/ipc.h>
 #include <async.h>
-#include <ipc/services.h>
 #include <as.h>
-#include <sysinfo.h>
+#include <ddi.h>
 #include <event.h>
 #include <errno.h>
 #include <str_error.h>
 #include <io/klog.h>
+#include <sysinfo.h>
+#include <malloc.h>
+#include <fibril_synch.h>
+#include <adt/list.h>
+#include <adt/prodcons.h>
 
 #define NAME       "klog"
 #define LOG_FNAME  "/log/klog"
+
+/* Producer/consumer buffers */
+typedef struct {
+        link_t link;
+        size_t length;
+        wchar_t *data;
+} item_t;
+
+static prodcons_t pc;
 
 /* Pointer to klog area */
@@ -53 +65 @@
 static size_t klog_length;
 
-static FILE *log;
-
-static void interrupt_received(ipc_callid_t callid, ipc_call_t *call)
-{
+/* Notification mutex */
+static FIBRIL_MUTEX_INITIALIZE(mtx);
+
+/** Klog producer
+ *
+ * Copies the contents of a character buffer to local
+ * producer/consumer queue.
+ *
+ * @param length Number of characters to copy.
+ * @param data   Pointer to the kernel klog buffer.
+ *
+ */
+static void producer(size_t length, wchar_t *data)
+{
+        item_t *item = (item_t *) malloc(sizeof(item_t));
+        if (item == NULL)
+                return;
+        
+        size_t sz = sizeof(wchar_t) * length;
+        wchar_t *buf = (wchar_t *) malloc(sz);
+        if (data == NULL) {
+                free(item);
+                return;
+        }
+        
+        memcpy(buf, data, sz);
+        
+        link_initialize(&item->link);
+        item->length = length;
+        item->data = buf;
+        prodcons_produce(&pc, &item->link);
+}
+
+/** Klog consumer
+ *
+ * Waits in an infinite loop for the character data created by
+ * the producer and outputs them to stdout and optionally into
+ * a file.
+ *
+ * @param data Unused.
+ *
+ * @return Always EOK (unreachable).
+ *
+ */
+static int consumer(void *data)
+{
+        FILE *log = fopen(LOG_FNAME, "a");
+        if (log == NULL)
+                printf("%s: Unable to create log file %s (%s)\n", NAME, LOG_FNAME,
+                    str_error(errno));
+        
+        while (true) {
+                link_t *link = prodcons_consume(&pc);
+                item_t *item = list_get_instance(link, item_t, link);
+                
+                for (size_t i = 0; i < item->length; i++)
+                        putchar(item->data[i]);
+                
+                if (log != NULL) {
+                        for (size_t i = 0; i < item->length; i++)
+                                fputc(item->data[i], log);
+                        
+                        fflush(log);
+                        fsync(fileno(log));
+                }
+                
+                free(item->data);
+                free(item);
+        }
+        
+        fclose(log);
+        return EOK;
+}
+
+/** Kernel notification handler
+ *
+ * Receives kernel klog notifications.
+ *
+ * @param callid IPC call ID.
+ * @param call   IPC call structure.
+ *
+ */
+static void notification_received(ipc_callid_t callid, ipc_call_t *call)
+{
+        /*
+         * Make sure we process only a single notification
+         * at any time to limit the chance of the consumer
+         * starving.
+         *
+         * Note: Usually the automatic masking of the klog
+         * notifications on the kernel side does the trick
+         * of limiting the chance of accidentally copying
+         * the same data multiple times. However, due to
+         * the non-blocking architecture of klog notifications,
+         * this possibility cannot be generally avoided.
+         */
+        
+        fibril_mutex_lock(&mtx);
+        
         size_t klog_start = (size_t) IPC_GET_ARG1(*call);
         size_t klog_len = (size_t) IPC_GET_ARG2(*call);
         size_t klog_stored = (size_t) IPC_GET_ARG3(*call);
-        size_t i;
-        
-        for (i = klog_len - klog_stored; i < klog_len; i++) {
-                wchar_t ch = klog[(klog_start + i) % klog_length];
-                
-                putchar(ch);
-                
-                if (log != NULL)
-                        fputc(ch, log);
-        }
-        
-        if (log != NULL) {
-                fflush(log);
-                fsync(fileno(log));
-        }
+        
+        size_t offset = (klog_start + klog_len - klog_stored) % klog_length;
+        
+        /* Copy data from the ring buffer */
+        if (offset + klog_stored >= klog_length) {
+                size_t split = klog_length - offset;
+                
+                producer(split, klog + offset);
+                producer(klog_stored - split, klog);
+        } else
+                producer(klog_stored, klog + offset);
+        
+        event_unmask(EVENT_KLOG);
+        fibril_mutex_unlock(&mtx);
 }
 
 int main(int argc, char *argv[])
 {
-        size_t klog_pages;
-        if (sysinfo_get_value("klog.pages", &klog_pages) != EOK) {
-                printf("%s: Error getting klog address\n", NAME);
-                return -1;
-        }
-        
-        size_t klog_size = klog_pages * PAGE_SIZE;
-        klog_length = klog_size / sizeof(wchar_t);
-        
-        klog = (wchar_t *) as_get_mappable_page(klog_size);
+        size_t pages;
+        int rc = sysinfo_get_value("klog.pages", &pages);
+        if (rc != EOK) {
+                fprintf(stderr, "%s: Unable to get number of klog pages\n",
+                    NAME);
+                return rc;
+        }
+        
+        uintptr_t faddr;
+        rc = sysinfo_get_value("klog.faddr", &faddr);
+        if (rc != EOK) {
+                fprintf(stderr, "%s: Unable to get klog physical address\n",
+                    NAME);
+                return rc;
+        }
+        
+        size_t size = pages * PAGE_SIZE;
+        klog_length = size / sizeof(wchar_t);
+        
+        klog = (wchar_t *) as_get_mappable_page(size);
         if (klog == NULL) {
-                printf("%s: Error allocating memory area\n", NAME);
-                return -1;
-        }
-        
-        int res = async_share_in_start_1_0(PHONE_NS, (void *) klog,
-            klog_size, SERVICE_MEM_KLOG);
-        if (res != EOK) {
-                printf("%s: Error initializing memory area\n", NAME);
-                return -1;
-        }
-        
-        if (event_subscribe(EVENT_KLOG, 0) != EOK) {
-                printf("%s: Error registering klog notifications\n", NAME);
-                return -1;
-        }
-        
-        /*
-         * Mode "a" would be definitively much better here, but it is
-         * not well supported by the FAT driver.
-         *
-         */
-        log = fopen(LOG_FNAME, "w");
-        if (log == NULL)
-                printf("%s: Unable to create log file %s (%s)\n", NAME, LOG_FNAME,
-                    str_error(errno));
-        
-        async_set_interrupt_received(interrupt_received);
+                fprintf(stderr, "%s: Unable to allocate virtual memory area\n",
+                    NAME);
+                return ENOMEM;
+        }
+        
+        rc = physmem_map((void *) faddr, (void *) klog, pages,
+            AS_AREA_READ | AS_AREA_CACHEABLE);
+        if (rc != EOK) {
+                fprintf(stderr, "%s: Unable to map klog\n", NAME);
+                return rc;
+        }
+        
+        prodcons_initialize(&pc);
+        async_set_interrupt_received(notification_received);
+        rc = event_subscribe(EVENT_KLOG, 0);
+        if (rc != EOK) {
+                fprintf(stderr, "%s: Unable to register klog notifications\n",
+                    NAME);
+                return rc;
+        }
+        
+        fid_t fid = fibril_create(consumer, NULL);
+        if (!fid) {
+                fprintf(stderr, "%s: Unable to create consumer fibril\n",
+                    NAME);
+                return ENOMEM;
+        }
+        
+        fibril_add_ready(fid);
+        event_unmask(EVENT_KLOG);
         klog_update();
+        
+        task_retval(0);
         async_manager();