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-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etr.c342
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc.h55
2 files changed, 308 insertions, 89 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 54d5c0664277..fba659dd2ee0 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -6,10 +6,18 @@
#include <linux/coresight.h>
#include <linux/dma-mapping.h>
+#include <linux/iommu.h>
#include <linux/slab.h>
#include "coresight-priv.h"
#include "coresight-tmc.h"
+struct etr_flat_buf {
+ struct device *dev;
+ dma_addr_t daddr;
+ void *vaddr;
+ size_t size;
+};
+
/*
* The TMC ETR SG has a page size of 4K. The SG table contains pointers
* to 4KB buffers. However, the OS may use a PAGE_SIZE different from
@@ -540,16 +548,207 @@ tmc_init_etr_sg_table(struct device *dev, int node,
return etr_table;
}
+/*
+ * tmc_etr_alloc_flat_buf: Allocate a contiguous DMA buffer.
+ */
+static int tmc_etr_alloc_flat_buf(struct tmc_drvdata *drvdata,
+ struct etr_buf *etr_buf, int node,
+ void **pages)
+{
+ struct etr_flat_buf *flat_buf;
+
+ /* We cannot reuse existing pages for flat buf */
+ if (pages)
+ return -EINVAL;
+
+ flat_buf = kzalloc(sizeof(*flat_buf), GFP_KERNEL);
+ if (!flat_buf)
+ return -ENOMEM;
+
+ flat_buf->vaddr = dma_alloc_coherent(drvdata->dev, etr_buf->size,
+ &flat_buf->daddr, GFP_KERNEL);
+ if (!flat_buf->vaddr) {
+ kfree(flat_buf);
+ return -ENOMEM;
+ }
+
+ flat_buf->size = etr_buf->size;
+ flat_buf->dev = drvdata->dev;
+ etr_buf->hwaddr = flat_buf->daddr;
+ etr_buf->mode = ETR_MODE_FLAT;
+ etr_buf->private = flat_buf;
+ return 0;
+}
+
+static void tmc_etr_free_flat_buf(struct etr_buf *etr_buf)
+{
+ struct etr_flat_buf *flat_buf = etr_buf->private;
+
+ if (flat_buf && flat_buf->daddr)
+ dma_free_coherent(flat_buf->dev, flat_buf->size,
+ flat_buf->vaddr, flat_buf->daddr);
+ kfree(flat_buf);
+}
+
+static void tmc_etr_sync_flat_buf(struct etr_buf *etr_buf, u64 rrp, u64 rwp)
+{
+ /*
+ * Adjust the buffer to point to the beginning of the trace data
+ * and update the available trace data.
+ */
+ etr_buf->offset = rrp - etr_buf->hwaddr;
+ if (etr_buf->full)
+ etr_buf->len = etr_buf->size;
+ else
+ etr_buf->len = rwp - rrp;
+}
+
+static ssize_t tmc_etr_get_data_flat_buf(struct etr_buf *etr_buf,
+ u64 offset, size_t len, char **bufpp)
+{
+ struct etr_flat_buf *flat_buf = etr_buf->private;
+
+ *bufpp = (char *)flat_buf->vaddr + offset;
+ /*
+ * tmc_etr_buf_get_data already adjusts the length to handle
+ * buffer wrapping around.
+ */
+ return len;
+}
+
+static const struct etr_buf_operations etr_flat_buf_ops = {
+ .alloc = tmc_etr_alloc_flat_buf,
+ .free = tmc_etr_free_flat_buf,
+ .sync = tmc_etr_sync_flat_buf,
+ .get_data = tmc_etr_get_data_flat_buf,
+};
+
+static const struct etr_buf_operations *etr_buf_ops[] = {
+ [ETR_MODE_FLAT] = &etr_flat_buf_ops,
+};
+
+static inline int tmc_etr_mode_alloc_buf(int mode,
+ struct tmc_drvdata *drvdata,
+ struct etr_buf *etr_buf, int node,
+ void **pages)
+{
+ int rc;
+
+ switch (mode) {
+ case ETR_MODE_FLAT:
+ rc = etr_buf_ops[mode]->alloc(drvdata, etr_buf, node, pages);
+ if (!rc)
+ etr_buf->ops = etr_buf_ops[mode];
+ return rc;
+ default:
+ return -EINVAL;
+ }
+}
+
+/*
+ * tmc_alloc_etr_buf: Allocate a buffer use by ETR.
+ * @drvdata : ETR device details.
+ * @size : size of the requested buffer.
+ * @flags : Required properties for the buffer.
+ * @node : Node for memory allocations.
+ * @pages : An optional list of pages.
+ */
+static struct etr_buf *tmc_alloc_etr_buf(struct tmc_drvdata *drvdata,
+ ssize_t size, int flags,
+ int node, void **pages)
+{
+ int rc = 0;
+ struct etr_buf *etr_buf;
+
+ etr_buf = kzalloc(sizeof(*etr_buf), GFP_KERNEL);
+ if (!etr_buf)
+ return ERR_PTR(-ENOMEM);
+
+ etr_buf->size = size;
+
+ rc = tmc_etr_mode_alloc_buf(ETR_MODE_FLAT, drvdata,
+ etr_buf, node, pages);
+ if (rc) {
+ kfree(etr_buf);
+ return ERR_PTR(rc);
+ }
+
+ return etr_buf;
+}
+
+static void tmc_free_etr_buf(struct etr_buf *etr_buf)
+{
+ WARN_ON(!etr_buf->ops || !etr_buf->ops->free);
+ etr_buf->ops->free(etr_buf);
+ kfree(etr_buf);
+}
+
+/*
+ * tmc_etr_buf_get_data: Get the pointer the trace data at @offset
+ * with a maximum of @len bytes.
+ * Returns: The size of the linear data available @pos, with *bufpp
+ * updated to point to the buffer.
+ */
+static ssize_t tmc_etr_buf_get_data(struct etr_buf *etr_buf,
+ u64 offset, size_t len, char **bufpp)
+{
+ /* Adjust the length to limit this transaction to end of buffer */
+ len = (len < (etr_buf->size - offset)) ? len : etr_buf->size - offset;
+
+ return etr_buf->ops->get_data(etr_buf, (u64)offset, len, bufpp);
+}
+
+static inline s64
+tmc_etr_buf_insert_barrier_packet(struct etr_buf *etr_buf, u64 offset)
+{
+ ssize_t len;
+ char *bufp;
+
+ len = tmc_etr_buf_get_data(etr_buf, offset,
+ CORESIGHT_BARRIER_PKT_SIZE, &bufp);
+ if (WARN_ON(len <= CORESIGHT_BARRIER_PKT_SIZE))
+ return -EINVAL;
+ coresight_insert_barrier_packet(bufp);
+ return offset + CORESIGHT_BARRIER_PKT_SIZE;
+}
+
+/*
+ * tmc_sync_etr_buf: Sync the trace buffer availability with drvdata.
+ * Makes sure the trace data is synced to the memory for consumption.
+ * @etr_buf->offset will hold the offset to the beginning of the trace data
+ * within the buffer, with @etr_buf->len bytes to consume.
+ */
+static void tmc_sync_etr_buf(struct tmc_drvdata *drvdata)
+{
+ struct etr_buf *etr_buf = drvdata->etr_buf;
+ u64 rrp, rwp;
+ u32 status;
+
+ rrp = tmc_read_rrp(drvdata);
+ rwp = tmc_read_rwp(drvdata);
+ status = readl_relaxed(drvdata->base + TMC_STS);
+ etr_buf->full = status & TMC_STS_FULL;
+
+ WARN_ON(!etr_buf->ops || !etr_buf->ops->sync);
+
+ etr_buf->ops->sync(etr_buf, rrp, rwp);
+
+ /* Insert barrier packets at the beginning, if there was an overflow */
+ if (etr_buf->full)
+ tmc_etr_buf_insert_barrier_packet(etr_buf, etr_buf->offset);
+}
+
static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
{
u32 axictl, sts;
+ struct etr_buf *etr_buf = drvdata->etr_buf;
CS_UNLOCK(drvdata->base);
/* Wait for TMCSReady bit to be set */
tmc_wait_for_tmcready(drvdata);
- writel_relaxed(drvdata->size / 4, drvdata->base + TMC_RSZ);
+ writel_relaxed(etr_buf->size / 4, drvdata->base + TMC_RSZ);
writel_relaxed(TMC_MODE_CIRCULAR_BUFFER, drvdata->base + TMC_MODE);
axictl = readl_relaxed(drvdata->base + TMC_AXICTL);
@@ -563,15 +762,15 @@ static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
}
writel_relaxed(axictl, drvdata->base + TMC_AXICTL);
- tmc_write_dba(drvdata, drvdata->paddr);
+ tmc_write_dba(drvdata, etr_buf->hwaddr);
/*
* If the TMC pointers must be programmed before the session,
* we have to set it properly (i.e, RRP/RWP to base address and
* STS to "not full").
*/
if (tmc_etr_has_cap(drvdata, TMC_ETR_SAVE_RESTORE)) {
- tmc_write_rrp(drvdata, drvdata->paddr);
- tmc_write_rwp(drvdata, drvdata->paddr);
+ tmc_write_rrp(drvdata, etr_buf->hwaddr);
+ tmc_write_rwp(drvdata, etr_buf->hwaddr);
sts = readl_relaxed(drvdata->base + TMC_STS) & ~TMC_STS_FULL;
writel_relaxed(sts, drvdata->base + TMC_STS);
}
@@ -587,59 +786,48 @@ static void tmc_etr_enable_hw(struct tmc_drvdata *drvdata)
}
/*
- * Return the available trace data in the buffer @pos, with a maximum
- * limit of @len, also updating the @bufpp on where to find it.
+ * Return the available trace data in the buffer (starts at etr_buf->offset,
+ * limited by etr_buf->len) from @pos, with a maximum limit of @len,
+ * also updating the @bufpp on where to find it. Since the trace data
+ * starts at anywhere in the buffer, depending on the RRP, we adjust the
+ * @len returned to handle buffer wrapping around.
*/
ssize_t tmc_etr_get_sysfs_trace(struct tmc_drvdata *drvdata,
loff_t pos, size_t len, char **bufpp)
{
+ s64 offset;
ssize_t actual = len;
- char *bufp = drvdata->buf + pos;
- char *bufend = (char *)(drvdata->vaddr + drvdata->size);
-
- /* Adjust the len to available size @pos */
- if (pos + actual > drvdata->len)
- actual = drvdata->len - pos;
+ struct etr_buf *etr_buf = drvdata->etr_buf;
+ if (pos + actual > etr_buf->len)
+ actual = etr_buf->len - pos;
if (actual <= 0)
return actual;
- /*
- * Since we use a circular buffer, with trace data starting
- * @drvdata->buf, possibly anywhere in the buffer @drvdata->vaddr,
- * wrap the current @pos to within the buffer.
- */
- if (bufp >= bufend)
- bufp -= drvdata->size;
- /*
- * For simplicity, avoid copying over a wrapped around buffer.
- */
- if ((bufp + actual) > bufend)
- actual = bufend - bufp;
- *bufpp = bufp;
- return actual;
+ /* Compute the offset from which we read the data */
+ offset = etr_buf->offset + pos;
+ if (offset >= etr_buf->size)
+ offset -= etr_buf->size;
+ return tmc_etr_buf_get_data(etr_buf, offset, actual, bufpp);
}
-static void tmc_etr_dump_hw(struct tmc_drvdata *drvdata)
+static struct etr_buf *
+tmc_etr_setup_sysfs_buf(struct tmc_drvdata *drvdata)
{
- u32 val;
- u64 rwp;
+ return tmc_alloc_etr_buf(drvdata, drvdata->size,
+ 0, cpu_to_node(0), NULL);
+}
- rwp = tmc_read_rwp(drvdata);
- val = readl_relaxed(drvdata->base + TMC_STS);
+static void
+tmc_etr_free_sysfs_buf(struct etr_buf *buf)
+{
+ if (buf)
+ tmc_free_etr_buf(buf);
+}
- /*
- * Adjust the buffer to point to the beginning of the trace data
- * and update the available trace data.
- */
- if (val & TMC_STS_FULL) {
- drvdata->buf = drvdata->vaddr + rwp - drvdata->paddr;
- drvdata->len = drvdata->size;
- coresight_insert_barrier_packet(drvdata->buf);
- } else {
- drvdata->buf = drvdata->vaddr;
- drvdata->len = rwp - drvdata->paddr;
- }
+static void tmc_etr_sync_sysfs_buf(struct tmc_drvdata *drvdata)
+{
+ tmc_sync_etr_buf(drvdata);
}
static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
@@ -652,7 +840,8 @@ static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
* read before the TMC is disabled.
*/
if (drvdata->mode == CS_MODE_SYSFS)
- tmc_etr_dump_hw(drvdata);
+ tmc_etr_sync_sysfs_buf(drvdata);
+
tmc_disable_hw(drvdata);
CS_LOCK(drvdata->base);
@@ -661,35 +850,32 @@ static void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
{
int ret = 0;
- bool used = false;
unsigned long flags;
- void __iomem *vaddr = NULL;
- dma_addr_t paddr = 0;
struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+ struct etr_buf *new_buf = NULL, *free_buf = NULL;
/*
- * If we don't have a buffer release the lock and allocate memory.
- * Otherwise keep the lock and move along.
+ * If we are enabling the ETR from disabled state, we need to make
+ * sure we have a buffer with the right size. The etr_buf is not reset
+ * immediately after we stop the tracing in SYSFS mode as we wait for
+ * the user to collect the data. We may be able to reuse the existing
+ * buffer, provided the size matches. Any allocation has to be done
+ * with the lock released.
*/
spin_lock_irqsave(&drvdata->spinlock, flags);
- if (!drvdata->vaddr) {
+ if (!drvdata->etr_buf || (drvdata->etr_buf->size != drvdata->size)) {
spin_unlock_irqrestore(&drvdata->spinlock, flags);
- /*
- * Contiguous memory can't be allocated while a spinlock is
- * held. As such allocate memory here and free it if a buffer
- * has already been allocated (from a previous session).
- */
- vaddr = dma_alloc_coherent(drvdata->dev, drvdata->size,
- &paddr, GFP_KERNEL);
- if (!vaddr)
- return -ENOMEM;
+ /* Allocate memory with the locks released */
+ free_buf = new_buf = tmc_etr_setup_sysfs_buf(drvdata);
+ if (IS_ERR(new_buf))
+ return PTR_ERR(new_buf);
/* Let's try again */
spin_lock_irqsave(&drvdata->spinlock, flags);
}
- if (drvdata->reading) {
+ if (drvdata->reading || drvdata->mode == CS_MODE_PERF) {
ret = -EBUSY;
goto out;
}
@@ -697,21 +883,19 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
/*
* In sysFS mode we can have multiple writers per sink. Since this
* sink is already enabled no memory is needed and the HW need not be
- * touched.
+ * touched, even if the buffer size has changed.
*/
if (drvdata->mode == CS_MODE_SYSFS)
goto out;
/*
- * If drvdata::vaddr == NULL, use the memory allocated above.
- * Otherwise a buffer still exists from a previous session, so
- * simply use that.
+ * If we don't have a buffer or it doesn't match the requested size,
+ * use the buffer allocated above. Otherwise reuse the existing buffer.
*/
- if (drvdata->vaddr == NULL) {
- used = true;
- drvdata->vaddr = vaddr;
- drvdata->paddr = paddr;
- drvdata->buf = drvdata->vaddr;
+ if (!drvdata->etr_buf ||
+ (new_buf && drvdata->etr_buf->size != new_buf->size)) {
+ free_buf = drvdata->etr_buf;
+ drvdata->etr_buf = new_buf;
}
drvdata->mode = CS_MODE_SYSFS;
@@ -720,8 +904,8 @@ out:
spin_unlock_irqrestore(&drvdata->spinlock, flags);
/* Free memory outside the spinlock if need be */
- if (!used && vaddr)
- dma_free_coherent(drvdata->dev, drvdata->size, vaddr, paddr);
+ if (free_buf)
+ tmc_etr_free_sysfs_buf(free_buf);
if (!ret)
dev_info(drvdata->dev, "TMC-ETR enabled\n");
@@ -800,8 +984,8 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata)
goto out;
}
- /* If drvdata::buf is NULL the trace data has been read already */
- if (drvdata->buf == NULL) {
+ /* If drvdata::etr_buf is NULL the trace data has been read already */
+ if (drvdata->etr_buf == NULL) {
ret = -EINVAL;
goto out;
}
@@ -820,8 +1004,7 @@ out:
int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
{
unsigned long flags;
- dma_addr_t paddr;
- void __iomem *vaddr = NULL;
+ struct etr_buf *etr_buf = NULL;
/* config types are set a boot time and never change */
if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR))
@@ -842,17 +1025,16 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
* The ETR is not tracing and the buffer was just read.
* As such prepare to free the trace buffer.
*/
- vaddr = drvdata->vaddr;
- paddr = drvdata->paddr;
- drvdata->buf = drvdata->vaddr = NULL;
+ etr_buf = drvdata->etr_buf;
+ drvdata->etr_buf = NULL;
}
drvdata->reading = false;
spin_unlock_irqrestore(&drvdata->spinlock, flags);
/* Free allocated memory out side of the spinlock */
- if (vaddr)
- dma_free_coherent(drvdata->dev, drvdata->size, vaddr, paddr);
+ if (etr_buf)
+ tmc_free_etr_buf(etr_buf);
return 0;
}
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index cdb668b4441d..bbd65e2107be 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -123,6 +123,34 @@ enum tmc_mem_intf_width {
#define CORESIGHT_SOC_600_ETR_CAPS \
(TMC_ETR_SAVE_RESTORE | TMC_ETR_AXI_ARCACHE)
+enum etr_mode {
+ ETR_MODE_FLAT, /* Uses contiguous flat buffer */
+};
+
+struct etr_buf_operations;
+
+/**
+ * struct etr_buf - Details of the buffer used by ETR
+ * @mode : Mode of the ETR buffer, contiguous, Scatter Gather etc.
+ * @full : Trace data overflow
+ * @size : Size of the buffer.
+ * @hwaddr : Address to be programmed in the TMC:DBA{LO,HI}
+ * @offset : Offset of the trace data in the buffer for consumption.
+ * @len : Available trace data @buf (may round up to the beginning).
+ * @ops : ETR buffer operations for the mode.
+ * @private : Backend specific information for the buf
+ */
+struct etr_buf {
+ enum etr_mode mode;
+ bool full;
+ ssize_t size;
+ dma_addr_t hwaddr;
+ unsigned long offset;
+ s64 len;
+ const struct etr_buf_operations *ops;
+ void *private;
+};
+
/**
* struct tmc_drvdata - specifics associated to an TMC component
* @base: memory mapped base address for this component.
@@ -130,11 +158,10 @@ enum tmc_mem_intf_width {
* @csdev: component vitals needed by the framework.
* @miscdev: specifics to handle "/dev/xyz.tmc" entry.
* @spinlock: only one at a time pls.
- * @buf: area of memory where trace data get sent.
- * @paddr: DMA start location in RAM.
- * @vaddr: virtual representation of @paddr.
- * @size: trace buffer size.
- * @len: size of the available trace.
+ * @buf: Snapshot of the trace data for ETF/ETB.
+ * @etr_buf: details of buffer used in TMC-ETR
+ * @len: size of the available trace for ETF/ETB.
+ * @size: trace buffer size for this TMC (common for all modes).
* @mode: how this TMC is being used.
* @config_type: TMC variant, must be of type @tmc_config_type.
* @memwidth: width of the memory interface databus, in bytes.
@@ -149,11 +176,12 @@ struct tmc_drvdata {
struct miscdevice miscdev;
spinlock_t spinlock;
bool reading;
- char *buf;
- dma_addr_t paddr;
- void __iomem *vaddr;
- u32 size;
+ union {
+ char *buf; /* TMC ETB */
+ struct etr_buf *etr_buf; /* TMC ETR */
+ };
u32 len;
+ u32 size;
u32 mode;
enum tmc_config_type config_type;
enum tmc_mem_intf_width memwidth;
@@ -161,6 +189,15 @@ struct tmc_drvdata {
u32 etr_caps;
};
+struct etr_buf_operations {
+ int (*alloc)(struct tmc_drvdata *drvdata, struct etr_buf *etr_buf,
+ int node, void **pages);
+ void (*sync)(struct etr_buf *etr_buf, u64 rrp, u64 rwp);
+ ssize_t (*get_data)(struct etr_buf *etr_buf, u64 offset, size_t len,
+ char **bufpp);
+ void (*free)(struct etr_buf *etr_buf);
+};
+
/**
* struct tmc_pages - Collection of pages used for SG.
* @nr_pages: Number of pages in the list.