1 files changed, 295 insertions, 0 deletions
diff --git a/driver/sysfs.c b/driver/sysfs.c
new file mode 100644
index 0000000..b082d3c
--- /dev/null
+++ b/driver/sysfs.c
@@ -0,0 +1,295 @@
+/**
+ *
+ * @file sysfs.c
+ * @brief This file contains the functions providing the SysFS-interface.
+ * @author Guillermo Marcus
+ * @date 2010-03-01
+ *
+ */
+#include <linux/version.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/cdev.h>
+#include <linux/wait.h>
+#include <linux/mm.h>
+#include <linux/pagemap.h>
+#include <linux/kernel.h>
+
+#include "compat.h"
+#include "config.h"
+#include "pciDriver.h"
+#include "common.h"
+#include "umem.h"
+#include "kmem.h"
+#include "sysfs.h"
+
+static SYSFS_GET_FUNCTION(pcidriver_show_kmem_entry);
+static SYSFS_GET_FUNCTION(pcidriver_show_umem_entry);
+
+/**
+ *
+ * Initializes the sysfs attributes for an kmem/umem-entry
+ *
+ */
+static int _pcidriver_sysfs_initialize(pcidriver_privdata_t *privdata,
+					int id,
+					struct class_device_attribute *sysfs_attr,
+					const char *fmtstring,
+					SYSFS_GET_FUNCTION((*callback)))
+{
+	/* sysfs attributes for kmem buffers don’t make sense before 2.6.13, as
+	   we have no mmap support before */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)
+	char namebuffer[16];
+
+	/* allocate space for the name of the attribute */
+	snprintf(namebuffer, sizeof(namebuffer), fmtstring, id);
+
+	if ((sysfs_attr->attr.name = kstrdup(namebuffer, GFP_KERNEL)) == NULL)
+		return -ENOMEM;
+
+	sysfs_attr->attr.mode = S_IRUGO;
+	sysfs_attr->attr.owner = THIS_MODULE;
+	sysfs_attr->show = callback;
+	sysfs_attr->store = NULL;
+			
+	/* name and add attribute */
+	if (class_device_create_file(privdata->class_dev, sysfs_attr) != 0)
+		return -ENXIO; /* Device not configured. Not the really best choice, but hm. */
+#endif
+
+	return 0;
+}
+
+int pcidriver_sysfs_initialize_kmem(pcidriver_privdata_t *privdata, int id, struct class_device_attribute *sysfs_attr)
+{
+	return _pcidriver_sysfs_initialize(privdata, id, sysfs_attr, "kbuf%d", pcidriver_show_kmem_entry);
+}
+
+int pcidriver_sysfs_initialize_umem(pcidriver_privdata_t *privdata, int id, struct class_device_attribute *sysfs_attr)
+{
+	return _pcidriver_sysfs_initialize(privdata, id, sysfs_attr, "umem%d", pcidriver_show_umem_entry);
+}
+
+/**
+ *
+ * Removes the file from sysfs and frees the allocated (kstrdup()) memory.
+ *
+ */
+void pcidriver_sysfs_remove(pcidriver_privdata_t *privdata, struct class_device_attribute *sysfs_attr)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)
+	class_device_remove_file(privdata->class_dev, sysfs_attr);
+	kfree(sysfs_attr->attr.name);
+#endif
+}
+
+static SYSFS_GET_FUNCTION(pcidriver_show_kmem_entry)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)
+//	pcidriver_privdata_t *privdata = (pcidriver_privdata_t *)cls->class_data;
+
+        /* As we can be sure that attr.name contains a filename which we
+         * created (see _pcidriver_sysfs_initialize), we do not need to have
+         * sanity checks but can directly call simple_strtol() */
+        int id = simple_strtol(attr->attr.name + strlen("kbuf"), NULL, 10);
+
+	return snprintf(buf, PAGE_SIZE, "I am in the kmem_entry show function for buffer %d\n", id);
+#else
+	return 0;
+#endif
+}
+
+static SYSFS_GET_FUNCTION(pcidriver_show_umem_entry)
+{
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,13)
+#if 0
+	pcidriver_privdata_t *privdata = (pcidriver_privdata_t *)cls->class_data;
+
+	return snprintf(buf, PAGE_SIZE, "I am in the umem_entry show function, class_device_kobj_name: %s\n", cls->kobj.name);
+#endif
+	return 0;
+#else
+	return 0;
+#endif
+}
+
+#ifdef ENABLE_IRQ
+SYSFS_GET_FUNCTION(pcidriver_show_irq_count)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", privdata->irq_count);
+}
+
+SYSFS_GET_FUNCTION(pcidriver_show_irq_queues)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+	int i, offset;
+
+	/* output will be truncated to PAGE_SIZE */
+	offset = snprintf(buf, PAGE_SIZE, "Queue\tOutstanding IRQs\n");
+	for (i = 0; i < PCIDRIVER_INT_MAXSOURCES; i++)
+		offset += snprintf(buf+offset, PAGE_SIZE-offset, "%d\t%d\n", i, atomic_read(&(privdata->irq_outstanding[i])) );
+
+	return (offset > PAGE_SIZE ? PAGE_SIZE : offset+1);
+}
+#endif
+
+SYSFS_GET_FUNCTION(pcidriver_show_mmap_mode)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", privdata->mmap_mode);
+}
+
+SYSFS_SET_FUNCTION(pcidriver_store_mmap_mode)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+	int mode = -1;
+
+	/* Set the mmap-mode if it is either PCIDRIVER_MMAP_PCI or PCIDRIVER_MMAP_KMEM */
+	if (sscanf(buf, "%d", &mode) == 1 &&
+	    (mode == PCIDRIVER_MMAP_PCI || mode == PCIDRIVER_MMAP_KMEM))
+		privdata->mmap_mode = mode;
+
+	return strlen(buf);
+}
+
+SYSFS_GET_FUNCTION(pcidriver_show_mmap_area)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", privdata->mmap_area);
+}
+
+SYSFS_SET_FUNCTION(pcidriver_store_mmap_area)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+	int temp = -1;
+
+	sscanf(buf, "%d", &temp);
+
+	if ((temp >= PCIDRIVER_BAR0) && (temp <= PCIDRIVER_BAR5))
+		privdata->mmap_area = temp;
+
+	return strlen(buf);
+}
+
+SYSFS_GET_FUNCTION(pcidriver_show_kmem_count)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+
+	return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&(privdata->kmem_count)));
+}
+
+SYSFS_SET_FUNCTION(pcidriver_store_kmem_alloc)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+	kmem_handle_t kmem_handle;
+
+	/* FIXME: guillermo: is validation of parsing an unsigned int enough? */
+	if (sscanf(buf, "%lu", &kmem_handle.size) == 1)
+		pcidriver_kmem_alloc(privdata, &kmem_handle);
+
+	return strlen(buf);
+}
+
+SYSFS_SET_FUNCTION(pcidriver_store_kmem_free)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+	unsigned int id;
+	pcidriver_kmem_entry_t *kmem_entry;
+
+	/* Parse the ID of the kernel memory to be freed, check bounds */
+	if (sscanf(buf, "%u", &id) != 1 ||
+	    (id >= atomic_read(&(privdata->kmem_count))))
+		goto err;
+
+	if ((kmem_entry = pcidriver_kmem_find_entry_id(privdata,id)) == NULL)
+		goto err;
+
+	pcidriver_kmem_free_entry(privdata, kmem_entry );
+err:
+	return strlen(buf);
+}
+
+SYSFS_GET_FUNCTION(pcidriver_show_kbuffers)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+	int offset = 0;
+	struct list_head *ptr;
+	pcidriver_kmem_entry_t *entry;
+
+	/* print the header */
+	offset += snprintf(buf, PAGE_SIZE, "kbuf#\tcpu addr\tsize\n");
+
+	spin_lock(&(privdata->kmemlist_lock));
+	list_for_each(ptr, &(privdata->kmem_list)) {
+		entry = list_entry(ptr, pcidriver_kmem_entry_t, list);
+
+		/* print entry info */
+		if (offset > PAGE_SIZE) {
+			spin_unlock( &(privdata->kmemlist_lock) );
+			return PAGE_SIZE;
+		}
+
+		offset += snprintf(buf+offset, PAGE_SIZE-offset, "%3d\t%08lx\t%lu\n", entry->id, (unsigned long)(entry->dma_handle), entry->size );
+	}
+
+	spin_unlock(&(privdata->kmemlist_lock));
+
+	/* output will be truncated to PAGE_SIZE */
+	return (offset > PAGE_SIZE ? PAGE_SIZE : offset+1);
+}
+
+SYSFS_GET_FUNCTION(pcidriver_show_umappings)
+{
+	int offset = 0;
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+	struct list_head *ptr;
+	pcidriver_umem_entry_t *entry;
+
+	/* print the header */
+	offset += snprintf(buf, PAGE_SIZE, "umap#\tn_pages\tsg_ents\n");
+
+	spin_lock( &(privdata->umemlist_lock) );
+	list_for_each( ptr, &(privdata->umem_list) ) {
+		entry = list_entry(ptr, pcidriver_umem_entry_t, list );
+
+		/* print entry info */
+		if (offset > PAGE_SIZE) {
+			spin_unlock( &(privdata->umemlist_lock) );
+			return PAGE_SIZE;
+		}
+
+		offset += snprintf(buf+offset, PAGE_SIZE-offset, "%3d\t%lu\t%lu\n", entry->id,
+				(unsigned long)(entry->nr_pages), (unsigned long)(entry->nents));
+	}
+
+	spin_unlock( &(privdata->umemlist_lock) );
+
+	/* output will be truncated to PAGE_SIZE */
+	return (offset > PAGE_SIZE ? PAGE_SIZE : offset+1);
+}
+
+SYSFS_SET_FUNCTION(pcidriver_store_umem_unmap)
+{
+	pcidriver_privdata_t *privdata = SYSFS_GET_PRIVDATA;
+	pcidriver_umem_entry_t *umem_entry;
+	unsigned int id;
+
+	if (sscanf(buf, "%u", &id) != 1 ||
+	    (id >= atomic_read(&(privdata->umem_count))))
+		goto err;
+
+	if ((umem_entry = pcidriver_umem_find_entry_id(privdata, id)) == NULL)
+		goto err;
+
+	pcidriver_umem_sgunmap(privdata, umem_entry);
+err:
+	return strlen(buf);
+}