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path: root/drivers/ntb/test/ntb_tool.c
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Diffstat (limited to 'drivers/ntb/test/ntb_tool.c')
-rw-r--r--drivers/ntb/test/ntb_tool.c459
1 files changed, 452 insertions, 7 deletions
diff --git a/drivers/ntb/test/ntb_tool.c b/drivers/ntb/test/ntb_tool.c
index 6f5dc6ca673d..61bf2ef87e0e 100644
--- a/drivers/ntb/test/ntb_tool.c
+++ b/drivers/ntb/test/ntb_tool.c
@@ -59,6 +59,12 @@
*
* Eg: check if clearing the doorbell mask generates an interrupt.
*
+ * # Check the link status
+ * root@self# cat $DBG_DIR/link
+ *
+ * # Block until the link is up
+ * root@self# echo Y > $DBG_DIR/link_event
+ *
* # Set the doorbell mask
* root@self# echo 's 1' > $DBG_DIR/mask
*
@@ -79,6 +85,13 @@
* root@self# cat $DBG_DIR/spad
*
* Observe that spad 0 and 1 have the values set by the peer.
+ *
+ * # Check the memory window translation info
+ * cat $DBG_DIR/peer_trans0
+ *
+ * # Setup a 16k memory window buffer
+ * echo 16384 > $DBG_DIR/peer_trans0
+ *
*/
#include <linux/init.h>
@@ -89,6 +102,7 @@
#include <linux/dma-mapping.h>
#include <linux/pci.h>
#include <linux/slab.h>
+#include <linux/uaccess.h>
#include <linux/ntb.h>
@@ -105,11 +119,27 @@ MODULE_VERSION(DRIVER_VERSION);
MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_DESCRIPTION);
+#define MAX_MWS 16
+
static struct dentry *tool_dbgfs;
+struct tool_mw {
+ int idx;
+ struct tool_ctx *tc;
+ resource_size_t win_size;
+ resource_size_t size;
+ u8 __iomem *local;
+ u8 *peer;
+ dma_addr_t peer_dma;
+ struct dentry *peer_dbg_file;
+};
+
struct tool_ctx {
struct ntb_dev *ntb;
struct dentry *dbgfs;
+ wait_queue_head_t link_wq;
+ int mw_count;
+ struct tool_mw mws[MAX_MWS];
};
#define SPAD_FNAME_SIZE 0x10
@@ -135,6 +165,8 @@ static void tool_link_event(void *ctx)
dev_dbg(&tc->ntb->dev, "link is %s speed %d width %d\n",
up ? "up" : "down", speed, width);
+
+ wake_up(&tc->link_wq);
}
static void tool_db_event(void *ctx, int vec)
@@ -239,7 +271,14 @@ static ssize_t tool_spadfn_read(struct tool_ctx *tc, char __user *ubuf,
if (!spad_read_fn)
return -EINVAL;
- buf_size = min_t(size_t, size, 0x100);
+ spad_count = ntb_spad_count(tc->ntb);
+
+ /*
+ * We multiply the number of spads by 15 to get the buffer size
+ * this is from 3 for the %d, 10 for the largest hex value
+ * (0x00000000) and 2 for the tab and line feed.
+ */
+ buf_size = min_t(size_t, size, spad_count * 15);
buf = kmalloc(buf_size, GFP_KERNEL);
if (!buf)
@@ -247,7 +286,6 @@ static ssize_t tool_spadfn_read(struct tool_ctx *tc, char __user *ubuf,
pos = 0;
- spad_count = ntb_spad_count(tc->ntb);
for (i = 0; i < spad_count; ++i) {
pos += scnprintf(buf + pos, buf_size - pos, "%d\t%#x\n",
i, spad_read_fn(tc->ntb, i));
@@ -268,7 +306,7 @@ static ssize_t tool_spadfn_write(struct tool_ctx *tc,
{
int spad_idx;
u32 spad_val;
- char *buf;
+ char *buf, *buf_ptr;
int pos, n;
ssize_t rc;
@@ -288,14 +326,15 @@ static ssize_t tool_spadfn_write(struct tool_ctx *tc,
}
buf[size] = 0;
-
- n = sscanf(buf, "%d %i%n", &spad_idx, &spad_val, &pos);
+ buf_ptr = buf;
+ n = sscanf(buf_ptr, "%d %i%n", &spad_idx, &spad_val, &pos);
while (n == 2) {
+ buf_ptr += pos;
rc = spad_write_fn(tc->ntb, spad_idx, spad_val);
if (rc)
break;
- n = sscanf(buf + pos, "%d %i%n", &spad_idx, &spad_val, &pos);
+ n = sscanf(buf_ptr, "%d %i%n", &spad_idx, &spad_val, &pos);
}
if (n < 0)
@@ -442,8 +481,384 @@ static TOOL_FOPS_RDWR(tool_peer_spad_fops,
tool_peer_spad_read,
tool_peer_spad_write);
+static ssize_t tool_link_read(struct file *filep, char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct tool_ctx *tc = filep->private_data;
+ char buf[3];
+
+ buf[0] = ntb_link_is_up(tc->ntb, NULL, NULL) ? 'Y' : 'N';
+ buf[1] = '\n';
+ buf[2] = '\0';
+
+ return simple_read_from_buffer(ubuf, size, offp, buf, 2);
+}
+
+static ssize_t tool_link_write(struct file *filep, const char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct tool_ctx *tc = filep->private_data;
+ char buf[32];
+ size_t buf_size;
+ bool val;
+ int rc;
+
+ buf_size = min(size, (sizeof(buf) - 1));
+ if (copy_from_user(buf, ubuf, buf_size))
+ return -EFAULT;
+
+ buf[buf_size] = '\0';
+
+ rc = strtobool(buf, &val);
+ if (rc)
+ return rc;
+
+ if (val)
+ rc = ntb_link_enable(tc->ntb, NTB_SPEED_AUTO, NTB_WIDTH_AUTO);
+ else
+ rc = ntb_link_disable(tc->ntb);
+
+ if (rc)
+ return rc;
+
+ return size;
+}
+
+static TOOL_FOPS_RDWR(tool_link_fops,
+ tool_link_read,
+ tool_link_write);
+
+static ssize_t tool_link_event_write(struct file *filep,
+ const char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct tool_ctx *tc = filep->private_data;
+ char buf[32];
+ size_t buf_size;
+ bool val;
+ int rc;
+
+ buf_size = min(size, (sizeof(buf) - 1));
+ if (copy_from_user(buf, ubuf, buf_size))
+ return -EFAULT;
+
+ buf[buf_size] = '\0';
+
+ rc = strtobool(buf, &val);
+ if (rc)
+ return rc;
+
+ if (wait_event_interruptible(tc->link_wq,
+ ntb_link_is_up(tc->ntb, NULL, NULL) == val))
+ return -ERESTART;
+
+ return size;
+}
+
+static TOOL_FOPS_RDWR(tool_link_event_fops,
+ NULL,
+ tool_link_event_write);
+
+static ssize_t tool_mw_read(struct file *filep, char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct tool_mw *mw = filep->private_data;
+ ssize_t rc;
+ loff_t pos = *offp;
+ void *buf;
+
+ if (mw->local == NULL)
+ return -EIO;
+ if (pos < 0)
+ return -EINVAL;
+ if (pos >= mw->win_size || !size)
+ return 0;
+ if (size > mw->win_size - pos)
+ size = mw->win_size - pos;
+
+ buf = kmalloc(size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ memcpy_fromio(buf, mw->local + pos, size);
+ rc = copy_to_user(ubuf, buf, size);
+ if (rc == size) {
+ rc = -EFAULT;
+ goto err_free;
+ }
+
+ size -= rc;
+ *offp = pos + size;
+ rc = size;
+
+err_free:
+ kfree(buf);
+
+ return rc;
+}
+
+static ssize_t tool_mw_write(struct file *filep, const char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct tool_mw *mw = filep->private_data;
+ ssize_t rc;
+ loff_t pos = *offp;
+ void *buf;
+
+ if (pos < 0)
+ return -EINVAL;
+ if (pos >= mw->win_size || !size)
+ return 0;
+ if (size > mw->win_size - pos)
+ size = mw->win_size - pos;
+
+ buf = kmalloc(size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ rc = copy_from_user(buf, ubuf, size);
+ if (rc == size) {
+ rc = -EFAULT;
+ goto err_free;
+ }
+
+ size -= rc;
+ *offp = pos + size;
+ rc = size;
+
+ memcpy_toio(mw->local + pos, buf, size);
+
+err_free:
+ kfree(buf);
+
+ return rc;
+}
+
+static TOOL_FOPS_RDWR(tool_mw_fops,
+ tool_mw_read,
+ tool_mw_write);
+
+static ssize_t tool_peer_mw_read(struct file *filep, char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct tool_mw *mw = filep->private_data;
+
+ if (!mw->peer)
+ return -ENXIO;
+
+ return simple_read_from_buffer(ubuf, size, offp, mw->peer, mw->size);
+}
+
+static ssize_t tool_peer_mw_write(struct file *filep, const char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct tool_mw *mw = filep->private_data;
+
+ if (!mw->peer)
+ return -ENXIO;
+
+ return simple_write_to_buffer(mw->peer, mw->size, offp, ubuf, size);
+}
+
+static TOOL_FOPS_RDWR(tool_peer_mw_fops,
+ tool_peer_mw_read,
+ tool_peer_mw_write);
+
+static int tool_setup_mw(struct tool_ctx *tc, int idx, size_t req_size)
+{
+ int rc;
+ struct tool_mw *mw = &tc->mws[idx];
+ phys_addr_t base;
+ resource_size_t size, align, align_size;
+ char buf[16];
+
+ if (mw->peer)
+ return 0;
+
+ rc = ntb_mw_get_range(tc->ntb, idx, &base, &size, &align,
+ &align_size);
+ if (rc)
+ return rc;
+
+ mw->size = min_t(resource_size_t, req_size, size);
+ mw->size = round_up(mw->size, align);
+ mw->size = round_up(mw->size, align_size);
+ mw->peer = dma_alloc_coherent(&tc->ntb->pdev->dev, mw->size,
+ &mw->peer_dma, GFP_KERNEL);
+
+ if (!mw->peer)
+ return -ENOMEM;
+
+ rc = ntb_mw_set_trans(tc->ntb, idx, mw->peer_dma, mw->size);
+ if (rc)
+ goto err_free_dma;
+
+ snprintf(buf, sizeof(buf), "peer_mw%d", idx);
+ mw->peer_dbg_file = debugfs_create_file(buf, S_IRUSR | S_IWUSR,
+ mw->tc->dbgfs, mw,
+ &tool_peer_mw_fops);
+
+ return 0;
+
+err_free_dma:
+ dma_free_coherent(&tc->ntb->pdev->dev, mw->size,
+ mw->peer,
+ mw->peer_dma);
+ mw->peer = NULL;
+ mw->peer_dma = 0;
+ mw->size = 0;
+
+ return rc;
+}
+
+static void tool_free_mw(struct tool_ctx *tc, int idx)
+{
+ struct tool_mw *mw = &tc->mws[idx];
+
+ if (mw->peer) {
+ ntb_mw_clear_trans(tc->ntb, idx);
+ dma_free_coherent(&tc->ntb->pdev->dev, mw->size,
+ mw->peer,
+ mw->peer_dma);
+ }
+
+ mw->peer = NULL;
+ mw->peer_dma = 0;
+
+ debugfs_remove(mw->peer_dbg_file);
+
+ mw->peer_dbg_file = NULL;
+}
+
+static ssize_t tool_peer_mw_trans_read(struct file *filep,
+ char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct tool_mw *mw = filep->private_data;
+
+ char *buf;
+ size_t buf_size;
+ ssize_t ret, off = 0;
+
+ phys_addr_t base;
+ resource_size_t mw_size;
+ resource_size_t align;
+ resource_size_t align_size;
+
+ buf_size = min_t(size_t, size, 512);
+
+ buf = kmalloc(buf_size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ ntb_mw_get_range(mw->tc->ntb, mw->idx,
+ &base, &mw_size, &align, &align_size);
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Peer MW %d Information:\n", mw->idx);
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Physical Address \t%pa[p]\n",
+ &base);
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Window Size \t%lld\n",
+ (unsigned long long)mw_size);
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Alignment \t%lld\n",
+ (unsigned long long)align);
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Size Alignment \t%lld\n",
+ (unsigned long long)align_size);
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Ready \t%c\n",
+ (mw->peer) ? 'Y' : 'N');
+
+ off += scnprintf(buf + off, buf_size - off,
+ "Allocated Size \t%zd\n",
+ (mw->peer) ? (size_t)mw->size : 0);
+
+ ret = simple_read_from_buffer(ubuf, size, offp, buf, off);
+ kfree(buf);
+ return ret;
+}
+
+static ssize_t tool_peer_mw_trans_write(struct file *filep,
+ const char __user *ubuf,
+ size_t size, loff_t *offp)
+{
+ struct tool_mw *mw = filep->private_data;
+
+ char buf[32];
+ size_t buf_size;
+ unsigned long long val;
+ int rc;
+
+ buf_size = min(size, (sizeof(buf) - 1));
+ if (copy_from_user(buf, ubuf, buf_size))
+ return -EFAULT;
+
+ buf[buf_size] = '\0';
+
+ rc = kstrtoull(buf, 0, &val);
+ if (rc)
+ return rc;
+
+ tool_free_mw(mw->tc, mw->idx);
+ if (val)
+ rc = tool_setup_mw(mw->tc, mw->idx, val);
+
+ if (rc)
+ return rc;
+
+ return size;
+}
+
+static TOOL_FOPS_RDWR(tool_peer_mw_trans_fops,
+ tool_peer_mw_trans_read,
+ tool_peer_mw_trans_write);
+
+static int tool_init_mw(struct tool_ctx *tc, int idx)
+{
+ struct tool_mw *mw = &tc->mws[idx];
+ phys_addr_t base;
+ int rc;
+
+ rc = ntb_mw_get_range(tc->ntb, idx, &base, &mw->win_size,
+ NULL, NULL);
+ if (rc)
+ return rc;
+
+ mw->tc = tc;
+ mw->idx = idx;
+ mw->local = ioremap_wc(base, mw->win_size);
+ if (!mw->local)
+ return -EFAULT;
+
+ return 0;
+}
+
+static void tool_free_mws(struct tool_ctx *tc)
+{
+ int i;
+
+ for (i = 0; i < tc->mw_count; i++) {
+ tool_free_mw(tc, i);
+
+ if (tc->mws[i].local)
+ iounmap(tc->mws[i].local);
+
+ tc->mws[i].local = NULL;
+ }
+}
+
static void tool_setup_dbgfs(struct tool_ctx *tc)
{
+ int i;
+
/* This modules is useless without dbgfs... */
if (!tool_dbgfs) {
tc->dbgfs = NULL;
@@ -472,12 +887,31 @@ static void tool_setup_dbgfs(struct tool_ctx *tc)
debugfs_create_file("peer_spad", S_IRUSR | S_IWUSR, tc->dbgfs,
tc, &tool_peer_spad_fops);
+
+ debugfs_create_file("link", S_IRUSR | S_IWUSR, tc->dbgfs,
+ tc, &tool_link_fops);
+
+ debugfs_create_file("link_event", S_IWUSR, tc->dbgfs,
+ tc, &tool_link_event_fops);
+
+ for (i = 0; i < tc->mw_count; i++) {
+ char buf[30];
+
+ snprintf(buf, sizeof(buf), "mw%d", i);
+ debugfs_create_file(buf, S_IRUSR | S_IWUSR, tc->dbgfs,
+ &tc->mws[i], &tool_mw_fops);
+
+ snprintf(buf, sizeof(buf), "peer_trans%d", i);
+ debugfs_create_file(buf, S_IRUSR | S_IWUSR, tc->dbgfs,
+ &tc->mws[i], &tool_peer_mw_trans_fops);
+ }
}
static int tool_probe(struct ntb_client *self, struct ntb_dev *ntb)
{
struct tool_ctx *tc;
int rc;
+ int i;
if (ntb_db_is_unsafe(ntb))
dev_dbg(&ntb->dev, "doorbell is unsafe\n");
@@ -485,13 +919,21 @@ static int tool_probe(struct ntb_client *self, struct ntb_dev *ntb)
if (ntb_spad_is_unsafe(ntb))
dev_dbg(&ntb->dev, "scratchpad is unsafe\n");
- tc = kmalloc(sizeof(*tc), GFP_KERNEL);
+ tc = kzalloc(sizeof(*tc), GFP_KERNEL);
if (!tc) {
rc = -ENOMEM;
goto err_tc;
}
tc->ntb = ntb;
+ init_waitqueue_head(&tc->link_wq);
+
+ tc->mw_count = min(ntb_mw_count(tc->ntb), MAX_MWS);
+ for (i = 0; i < tc->mw_count; i++) {
+ rc = tool_init_mw(tc, i);
+ if (rc)
+ goto err_ctx;
+ }
tool_setup_dbgfs(tc);
@@ -505,6 +947,7 @@ static int tool_probe(struct ntb_client *self, struct ntb_dev *ntb)
return 0;
err_ctx:
+ tool_free_mws(tc);
debugfs_remove_recursive(tc->dbgfs);
kfree(tc);
err_tc:
@@ -515,6 +958,8 @@ static void tool_remove(struct ntb_client *self, struct ntb_dev *ntb)
{
struct tool_ctx *tc = ntb->ctx;
+ tool_free_mws(tc);
+
ntb_clear_ctx(ntb);
ntb_link_disable(ntb);