diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 2a8c513c4d07808d7ceaa46827e57a2d6267f0e4..cd1cfac0447f98343917c31c83564ab1d6cf21b0 100644
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -1191,8 +1191,8 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n",
sdd->port_id, master->num_chipselect);
- dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tDMA=[Rx-%d, Tx-%d]\n",
- mem_res,
+ dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\tDMA=[Rx-%d, Tx-%d]\n",
+ mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1,
sdd->rx_dma.dmach, sdd->tx_dma.dmach);
return 0;
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index d3370a612d8432cf48b6f4d5d885e696833b4349..a7934ab00b96505f3753fa38266238f3abcc6f64 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -48,8 +48,8 @@ struct sh_msiof_spi_priv {
const struct sh_msiof_chipdata *chipdata;
struct sh_msiof_spi_info *info;
struct completion done;
- int tx_fifo_size;
- int rx_fifo_size;
+ unsigned int tx_fifo_size;
+ unsigned int rx_fifo_size;
void *tx_dma_page;
void *rx_dma_page;
dma_addr_t tx_dma_addr;
@@ -95,8 +95,6 @@ struct sh_msiof_spi_priv {
#define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
#define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */
-#define MAX_WDLEN 256U
-
/* TSCR and RSCR */
#define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
#define SCR_BRPS(i) (((i) - 1) << 8)
@@ -850,7 +848,12 @@ static int sh_msiof_transfer_one(struct spi_master *master,
* DMA supports 32-bit words only, hence pack 8-bit and 16-bit
* words, with byte resp. word swapping.
*/
- unsigned int l = min(len, MAX_WDLEN * 4);
+ unsigned int l = 0;
+
+ if (tx_buf)
+ l = min(len, p->tx_fifo_size * 4);
+ if (rx_buf)
+ l = min(len, p->rx_fifo_size * 4);
if (bits <= 8) {
if (l & 3)
@@ -963,7 +966,7 @@ static const struct sh_msiof_chipdata sh_data = {
static const struct sh_msiof_chipdata r8a779x_data = {
.tx_fifo_size = 64,
- .rx_fifo_size = 256,
+ .rx_fifo_size = 64,
.master_flags = SPI_MASTER_MUST_TX,
};
@@ -1265,11 +1268,6 @@ static int sh_msiof_spi_remove(struct platform_device *pdev)
static const struct platform_device_id spi_driver_ids[] = {
{ "spi_sh_msiof", (kernel_ulong_t)&sh_data },
- { "spi_r8a7790_msiof", (kernel_ulong_t)&r8a779x_data },
- { "spi_r8a7791_msiof", (kernel_ulong_t)&r8a779x_data },
- { "spi_r8a7792_msiof", (kernel_ulong_t)&r8a779x_data },
- { "spi_r8a7793_msiof", (kernel_ulong_t)&r8a779x_data },
- { "spi_r8a7794_msiof", (kernel_ulong_t)&r8a779x_data },
{},
};
MODULE_DEVICE_TABLE(platform, spi_driver_ids);
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 24678ea45c570d8c758171074f5150d7269b838e..3abb3903f2ad454ef964299204bd3c2454890062 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -67,11 +67,141 @@ modalias_show(struct device *dev, struct device_attribute *a, char *buf)
}
static DEVICE_ATTR_RO(modalias);
+#define SPI_STATISTICS_ATTRS(field, file) \
+static ssize_t spi_master_##field##_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct spi_master *master = container_of(dev, \
+ struct spi_master, dev); \
+ return spi_statistics_##field##_show(&master->statistics, buf); \
+} \
+static struct device_attribute dev_attr_spi_master_##field = { \
+ .attr = { .name = file, .mode = S_IRUGO }, \
+ .show = spi_master_##field##_show, \
+}; \
+static ssize_t spi_device_##field##_show(struct device *dev, \
+ struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct spi_device *spi = container_of(dev, \
+ struct spi_device, dev); \
+ return spi_statistics_##field##_show(&spi->statistics, buf); \
+} \
+static struct device_attribute dev_attr_spi_device_##field = { \
+ .attr = { .name = file, .mode = S_IRUGO }, \
+ .show = spi_device_##field##_show, \
+}
+
+#define SPI_STATISTICS_SHOW_NAME(name, file, field, format_string) \
+static ssize_t spi_statistics_##name##_show(struct spi_statistics *stat, \
+ char *buf) \
+{ \
+ unsigned long flags; \
+ ssize_t len; \
+ spin_lock_irqsave(&stat->lock, flags); \
+ len = sprintf(buf, format_string, stat->field); \
+ spin_unlock_irqrestore(&stat->lock, flags); \
+ return len; \
+} \
+SPI_STATISTICS_ATTRS(name, file)
+
+#define SPI_STATISTICS_SHOW(field, format_string) \
+ SPI_STATISTICS_SHOW_NAME(field, __stringify(field), \
+ field, format_string)
+
+SPI_STATISTICS_SHOW(messages, "%lu");
+SPI_STATISTICS_SHOW(transfers, "%lu");
+SPI_STATISTICS_SHOW(errors, "%lu");
+SPI_STATISTICS_SHOW(timedout, "%lu");
+
+SPI_STATISTICS_SHOW(spi_sync, "%lu");
+SPI_STATISTICS_SHOW(spi_sync_immediate, "%lu");
+SPI_STATISTICS_SHOW(spi_async, "%lu");
+
+SPI_STATISTICS_SHOW(bytes, "%llu");
+SPI_STATISTICS_SHOW(bytes_rx, "%llu");
+SPI_STATISTICS_SHOW(bytes_tx, "%llu");
+
static struct attribute *spi_dev_attrs[] = {
&dev_attr_modalias.attr,
NULL,
};
-ATTRIBUTE_GROUPS(spi_dev);
+
+static const struct attribute_group spi_dev_group = {
+ .attrs = spi_dev_attrs,
+};
+
+static struct attribute *spi_device_statistics_attrs[] = {
+ &dev_attr_spi_device_messages.attr,
+ &dev_attr_spi_device_transfers.attr,
+ &dev_attr_spi_device_errors.attr,
+ &dev_attr_spi_device_timedout.attr,
+ &dev_attr_spi_device_spi_sync.attr,
+ &dev_attr_spi_device_spi_sync_immediate.attr,
+ &dev_attr_spi_device_spi_async.attr,
+ &dev_attr_spi_device_bytes.attr,
+ &dev_attr_spi_device_bytes_rx.attr,
+ &dev_attr_spi_device_bytes_tx.attr,
+ NULL,
+};
+
+static const struct attribute_group spi_device_statistics_group = {
+ .name = "statistics",
+ .attrs = spi_device_statistics_attrs,
+};
+
+static const struct attribute_group *spi_dev_groups[] = {
+ &spi_dev_group,
+ &spi_device_statistics_group,
+ NULL,
+};
+
+static struct attribute *spi_master_statistics_attrs[] = {
+ &dev_attr_spi_master_messages.attr,
+ &dev_attr_spi_master_transfers.attr,
+ &dev_attr_spi_master_errors.attr,
+ &dev_attr_spi_master_timedout.attr,
+ &dev_attr_spi_master_spi_sync.attr,
+ &dev_attr_spi_master_spi_sync_immediate.attr,
+ &dev_attr_spi_master_spi_async.attr,
+ &dev_attr_spi_master_bytes.attr,
+ &dev_attr_spi_master_bytes_rx.attr,
+ &dev_attr_spi_master_bytes_tx.attr,
+ NULL,
+};
+
+static const struct attribute_group spi_master_statistics_group = {
+ .name = "statistics",
+ .attrs = spi_master_statistics_attrs,
+};
+
+static const struct attribute_group *spi_master_groups[] = {
+ &spi_master_statistics_group,
+ NULL,
+};
+
+void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
+ struct spi_transfer *xfer,
+ struct spi_master *master)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&stats->lock, flags);
+
+ stats->transfers++;
+
+ stats->bytes += xfer->len;
+ if ((xfer->tx_buf) &&
+ (xfer->tx_buf != master->dummy_tx))
+ stats->bytes_tx += xfer->len;
+ if ((xfer->rx_buf) &&
+ (xfer->rx_buf != master->dummy_rx))
+ stats->bytes_rx += xfer->len;
+
+ spin_unlock_irqrestore(&stats->lock, flags);
+}
+EXPORT_SYMBOL_GPL(spi_statistics_add_transfer_stats);
/* modalias support makes "modprobe $MODALIAS" new-style hotplug work,
* and the sysfs version makes coldplug work too.
@@ -249,6 +379,9 @@ struct spi_device *spi_alloc_device(struct spi_master *master)
spi->dev.bus = &spi_bus_type;
spi->dev.release = spidev_release;
spi->cs_gpio = -ENOENT;
+
+ spin_lock_init(&spi->statistics.lock);
+
device_initialize(&spi->dev);
return spi;
}
@@ -476,21 +609,30 @@ static int spi_map_buf(struct spi_master *master, struct device *dev,
enum dma_data_direction dir)
{
const bool vmalloced_buf = is_vmalloc_addr(buf);
- const int desc_len = vmalloced_buf ? PAGE_SIZE : master->max_dma_len;
- const int sgs = DIV_ROUND_UP(len, desc_len);
+ int desc_len;
+ int sgs;
struct page *vm_page;
void *sg_buf;
size_t min;
int i, ret;
+ if (vmalloced_buf) {
+ desc_len = PAGE_SIZE;
+ sgs = DIV_ROUND_UP(len + offset_in_page(buf), desc_len);
+ } else {
+ desc_len = master->max_dma_len;
+ sgs = DIV_ROUND_UP(len, desc_len);
+ }
+
ret = sg_alloc_table(sgt, sgs, GFP_KERNEL);
if (ret != 0)
return ret;
for (i = 0; i < sgs; i++) {
- min = min_t(size_t, len, desc_len);
if (vmalloced_buf) {
+ min = min_t(size_t,
+ len, desc_len - offset_in_page(buf));
vm_page = vmalloc_to_page(buf);
if (!vm_page) {
sg_free_table(sgt);
@@ -499,6 +641,7 @@ static int spi_map_buf(struct spi_master *master, struct device *dev,
sg_set_page(&sgt->sgl[i], vm_page,
min, offset_in_page(buf));
} else {
+ min = min_t(size_t, len, desc_len);
sg_buf = buf;
sg_set_buf(&sgt->sgl[i], sg_buf, min);
}
@@ -703,17 +846,29 @@ static int spi_transfer_one_message(struct spi_master *master,
bool keep_cs = false;
int ret = 0;
unsigned long ms = 1;
+ struct spi_statistics *statm = &master->statistics;
+ struct spi_statistics *stats = &msg->spi->statistics;
spi_set_cs(msg->spi, true);
+ SPI_STATISTICS_INCREMENT_FIELD(statm, messages);
+ SPI_STATISTICS_INCREMENT_FIELD(stats, messages);
+
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
trace_spi_transfer_start(msg, xfer);
+ spi_statistics_add_transfer_stats(statm, xfer, master);
+ spi_statistics_add_transfer_stats(stats, xfer, master);
+
if (xfer->tx_buf || xfer->rx_buf) {
reinit_completion(&master->xfer_completion);
ret = master->transfer_one(master, msg->spi, xfer);
if (ret < 0) {
+ SPI_STATISTICS_INCREMENT_FIELD(statm,
+ errors);
+ SPI_STATISTICS_INCREMENT_FIELD(stats,
+ errors);
dev_err(&msg->spi->dev,
"SPI transfer failed: %d\n", ret);
goto out;
@@ -729,6 +884,10 @@ static int spi_transfer_one_message(struct spi_master *master,
}
if (ms == 0) {
+ SPI_STATISTICS_INCREMENT_FIELD(statm,
+ timedout);
+ SPI_STATISTICS_INCREMENT_FIELD(stats,
+ timedout);
dev_err(&msg->spi->dev,
"SPI transfer timed out\n");
msg->status = -ETIMEDOUT;
@@ -1430,10 +1589,10 @@ static struct class spi_master_class = {
.name = "spi_master",
.owner = THIS_MODULE,
.dev_release = spi_master_release,
+ .dev_groups = spi_master_groups,
};
-
/**
* spi_alloc_master - allocate SPI master controller
* @dev: the controller, possibly using the platform_bus
@@ -1599,6 +1758,8 @@ int spi_register_master(struct spi_master *master)
goto done;
}
}
+ /* add statistics */
+ spin_lock_init(&master->statistics.lock);
mutex_lock(&board_lock);
list_add_tail(&master->list, &spi_master_list);
@@ -1966,6 +2127,9 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
message->spi = spi;
+ SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, spi_async);
+ SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_async);
+
trace_spi_message_submit(message);
return master->transfer(spi, message);
@@ -2102,6 +2266,9 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message,
message->context = &done;
message->spi = spi;
+ SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, spi_sync);
+ SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_sync);
+
if (!bus_locked)
mutex_lock(&master->bus_lock_mutex);
@@ -2129,8 +2296,13 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message,
/* Push out the messages in the calling context if we
* can.
*/
- if (master->transfer == spi_queued_transfer)
+ if (master->transfer == spi_queued_transfer) {
+ SPI_STATISTICS_INCREMENT_FIELD(&master->statistics,
+ spi_sync_immediate);
+ SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics,
+ spi_sync_immediate);
__spi_pump_messages(master, false);
+ }
wait_for_completion(&done);
status = message->status;
diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index c7de64171c452325ab43884b501977a33f724b93..fba92a5265310c78acd9fb7e9c621f6d88942d24 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -602,11 +602,11 @@ static int spidev_open(struct inode *inode, struct file *filp)
if (!spidev->tx_buffer) {
spidev->tx_buffer = kmalloc(bufsiz, GFP_KERNEL);
if (!spidev->tx_buffer) {
- dev_dbg(&spidev->spi->dev, "open/ENOMEM\n");
- status = -ENOMEM;
+ dev_dbg(&spidev->spi->dev, "open/ENOMEM\n");
+ status = -ENOMEM;
goto err_find_dev;
- }
}
+ }
if (!spidev->rx_buffer) {
spidev->rx_buffer = kmalloc(bufsiz, GFP_KERNEL);
@@ -709,7 +709,7 @@ static int spidev_probe(struct spi_device *spi)
/*
* spidev should never be referenced in DT without a specific
- * compatbile string, it is a Linux implementation thing
+ * compatible string, it is a Linux implementation thing
* rather than a description of the hardware.
*/
if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) {
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index d673072346f2e0415fd4706c7606d5081f87f686..269e8afd3e2a5826c38282a3577447f3ff42997b 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -23,6 +23,8 @@
#include <linux/scatterlist.h>
struct dma_chan;
+struct spi_master;
+struct spi_transfer;
/*
* INTERFACES between SPI master-side drivers and SPI infrastructure.
@@ -30,6 +32,59 @@ struct dma_chan;
*/
extern struct bus_type spi_bus_type;
+/**
+ * struct spi_statistics - statistics for spi transfers
+ * @clock: lock protecting this structure
+ *
+ * @messages: number of spi-messages handled
+ * @transfers: number of spi_transfers handled
+ * @errors: number of errors during spi_transfer
+ * @timedout: number of timeouts during spi_transfer
+ *
+ * @spi_sync: number of times spi_sync is used
+ * @spi_sync_immediate:
+ * number of times spi_sync is executed immediately
+ * in calling context without queuing and scheduling
+ * @spi_async: number of times spi_async is used
+ *
+ * @bytes: number of bytes transferred to/from device
+ * @bytes_tx: number of bytes sent to device
+ * @bytes_rx: number of bytes received from device
+ *
+ */
+struct spi_statistics {
+ spinlock_t lock; /* lock for the whole structure */
+
+ unsigned long messages;
+ unsigned long transfers;
+ unsigned long errors;
+ unsigned long timedout;
+
+ unsigned long spi_sync;
+ unsigned long spi_sync_immediate;
+ unsigned long spi_async;
+
+ unsigned long long bytes;
+ unsigned long long bytes_rx;
+ unsigned long long bytes_tx;
+
+};
+
+void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
+ struct spi_transfer *xfer,
+ struct spi_master *master);
+
+#define SPI_STATISTICS_ADD_TO_FIELD(stats, field, count) \
+ do { \
+ unsigned long flags; \
+ spin_lock_irqsave(&(stats)->lock, flags); \
+ (stats)->field += count; \
+ spin_unlock_irqrestore(&(stats)->lock, flags); \
+ } while (0)
+
+#define SPI_STATISTICS_INCREMENT_FIELD(stats, field) \
+ SPI_STATISTICS_ADD_TO_FIELD(stats, field, 1)
+
/**
* struct spi_device - Master side proxy for an SPI slave device
* @dev: Driver model representation of the device.
@@ -60,6 +115,8 @@ extern struct bus_type spi_bus_type;
* @cs_gpio: gpio number of the chipselect line (optional, -ENOENT when
* when not using a GPIO line)
*
+ * @statistics: statistics for the spi_device
+ *
* A @spi_device is used to interchange data between an SPI slave
* (usually a discrete chip) and CPU memory.
*
@@ -98,6 +155,9 @@ struct spi_device {
char modalias[SPI_NAME_SIZE];
int cs_gpio; /* chip select gpio */
+ /* the statistics */
+ struct spi_statistics statistics;
+
/*
* likely need more hooks for more protocol options affecting how
* the controller talks to each chip, like:
@@ -296,6 +356,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS
* number. Any individual value may be -ENOENT for CS lines that
* are not GPIOs (driven by the SPI controller itself).
+ * @statistics: statistics for the spi_master
* @dma_tx: DMA transmit channel
* @dma_rx: DMA receive channel
* @dummy_rx: dummy receive buffer for full-duplex devices
@@ -452,6 +513,9 @@ struct spi_master {
/* gpio chip select */
int *cs_gpios;
+ /* statistics */
+ struct spi_statistics statistics;
+
/* DMA channels for use with core dmaengine helpers */
struct dma_chan *dma_tx;
struct dma_chan *dma_rx;