From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: gregkh@linuxfoundation.org
Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH 02/28] coresight-stm: support mmapping channel regions with mmio_addr
Date: Thu, 25 Aug 2016 15:18:52 -0600 [thread overview]
Message-ID: <1472159958-5981-3-git-send-email-mathieu.poirier@linaro.org> (raw)
In-Reply-To: <1472159958-5981-1-git-send-email-mathieu.poirier@linaro.org>
From: Chunyan Zhang <zhang.chunyan@linaro.org>
CoreSight STM device allows direct mapping of the channel regions to
userspace for zero-copy writing. To support this ability, the STM
framework has provided a hook 'mmio_addr', this patch just implemented
this hook for CoreSight STM.
This patch also added an item into 'channel_space' to save the physical
base address of channel region which mmap operation needs to know.
Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
drivers/hwtracing/coresight/coresight-stm.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-stm.c b/drivers/hwtracing/coresight/coresight-stm.c
index 73be58a11e4f..482c8bb27f87 100644
--- a/drivers/hwtracing/coresight/coresight-stm.c
+++ b/drivers/hwtracing/coresight/coresight-stm.c
@@ -105,10 +105,12 @@ module_param_named(
/**
* struct channel_space - central management entity for extended ports
* @base: memory mapped base address where channels start.
+ * @phys: physical base address of channel region.
* @guaraneed: is the channel delivery guaranteed.
*/
struct channel_space {
void __iomem *base;
+ phys_addr_t phys;
unsigned long *guaranteed;
};
@@ -356,6 +358,23 @@ static void stm_generic_unlink(struct stm_data *stm_data,
stm_disable(drvdata->csdev);
}
+static phys_addr_t
+stm_mmio_addr(struct stm_data *stm_data, unsigned int master,
+ unsigned int channel, unsigned int nr_chans)
+{
+ struct stm_drvdata *drvdata = container_of(stm_data,
+ struct stm_drvdata, stm);
+ phys_addr_t addr;
+
+ addr = drvdata->chs.phys + channel * BYTES_PER_CHANNEL;
+
+ if (offset_in_page(addr) ||
+ offset_in_page(nr_chans * BYTES_PER_CHANNEL))
+ return 0;
+
+ return addr;
+}
+
static long stm_generic_set_options(struct stm_data *stm_data,
unsigned int master,
unsigned int channel,
@@ -761,7 +780,9 @@ static void stm_init_generic_data(struct stm_drvdata *drvdata)
drvdata->stm.sw_end = 1;
drvdata->stm.hw_override = true;
drvdata->stm.sw_nchannels = drvdata->numsp;
+ drvdata->stm.sw_mmiosz = BYTES_PER_CHANNEL;
drvdata->stm.packet = stm_generic_packet;
+ drvdata->stm.mmio_addr = stm_mmio_addr;
drvdata->stm.link = stm_generic_link;
drvdata->stm.unlink = stm_generic_unlink;
drvdata->stm.set_options = stm_generic_set_options;
@@ -808,6 +829,7 @@ static int stm_probe(struct amba_device *adev, const struct amba_id *id)
ret = stm_get_resource_byname(np, "stm-stimulus-base", &ch_res);
if (ret)
return ret;
+ drvdata->chs.phys = ch_res.start;
base = devm_ioremap_resource(dev, &ch_res);
if (IS_ERR(base))
--
2.7.4
next prev parent reply other threads:[~2016-08-25 21:26 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-25 21:18 [PATCH 00/28] coresight: next v4.8-rc3 Mathieu Poirier
2016-08-25 21:18 ` [PATCH 01/28] coresight: access conn->child_name only if it's initialised Mathieu Poirier
2016-08-25 21:18 ` Mathieu Poirier [this message]
2016-08-25 21:18 ` [PATCH 03/28] coresight: always use stashed trace id value in etm4_trace_id Mathieu Poirier
2016-08-25 21:18 ` [PATCH 04/28] coresight: Remove erroneous dma_free_coherent in tmc_probe Mathieu Poirier
2016-08-25 21:18 ` [PATCH 05/28] coresight: Consolidate error handling path for tmc_probe Mathieu Poirier
2016-08-25 21:18 ` [PATCH 06/28] coresight: Fix csdev connections initialisation Mathieu Poirier
2016-08-25 21:18 ` [PATCH 07/28] coresight: tmc: Limit the trace to available data Mathieu Poirier
2016-08-25 21:18 ` [PATCH 08/28] coresight: etmv4: Fix ETMv4x peripheral ID table Mathieu Poirier
2016-08-25 21:18 ` [PATCH 09/28] coresight: Cleanup TMC status check Mathieu Poirier
2016-08-25 21:19 ` [PATCH 10/28] coresight: Add better messages for coresight_timeout Mathieu Poirier
2016-08-25 21:19 ` [PATCH 11/28] coresight: delay initialisation when children are missing Mathieu Poirier
2016-08-25 21:19 ` [PATCH 12/28] coresight: add PM runtime calls to coresight_simple_func() Mathieu Poirier
2016-08-25 21:19 ` [PATCH 13/28] coresight-etm3x: Add ARM ETM 3.5 Cortex-A5 peripheral ID Mathieu Poirier
2016-08-25 21:19 ` [PATCH 14/28] hwtracing: coresight: of_coresight: add missing of_node_put after calling of_parse_phandle Mathieu Poirier
2016-08-25 21:19 ` [PATCH 15/28] coresight: Use local coresight_desc instances Mathieu Poirier
2016-08-25 21:19 ` [PATCH 16/28] coresight: etm4x: remove duplicated include from coresight-etm4x.c Mathieu Poirier
2016-08-25 21:19 ` [PATCH 17/28] coresight: tmc: Delete an unnecessary check before the function call "kfree" Mathieu Poirier
2016-08-25 21:19 ` [PATCH 18/28] coresight: etm4x: request to retain power to the trace unit when active Mathieu Poirier
2016-08-25 21:19 ` [PATCH 19/28] coresight: fix handling of ETM trace register access via sysfs Mathieu Poirier
2016-08-25 21:19 ` [PATCH 20/28] coresight: etm-perf: pass struct perf_event to source::enable/disable() Mathieu Poirier
2016-08-25 21:19 ` [PATCH 21/28] coresight: remove duplicated enumeration Mathieu Poirier
2016-08-25 21:19 ` [PATCH 22/28] coresight: etm-perf: configuring filters from perf core Mathieu Poirier
2016-08-25 21:19 ` [PATCH 23/28] coresight: etm4x: split default and filter configuration Mathieu Poirier
2016-08-25 21:19 ` [PATCH 24/28] coresight: etm4x: cleaning up default " Mathieu Poirier
2016-08-25 21:19 ` [PATCH 25/28] coresight: etm4x: adding range filter configuration function Mathieu Poirier
2016-08-25 21:19 ` [PATCH 26/28] coresight: etm4x: configuring include/exclude function Mathieu Poirier
2016-08-25 21:19 ` [PATCH 27/28] coresight: etm4x: adding configurable address range filtering Mathieu Poirier
2016-08-25 21:19 ` [PATCH 28/28] coresight: etm4x: adding configurable start/stop filtering Mathieu Poirier
2016-08-31 11:08 ` [PATCH 00/28] coresight: next v4.8-rc3 Greg KH
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