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Subject[PATCH v2 2/8] remoteproc: qcom: Introduce driver to store pil info in IMEM
Date
A region in IMEM is used to communicate load addresses of remoteproc to
post mortem debug tools. Implement a driver that can be used to store
this information in order to enable these tools to process collected
ramdumps.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---

Changes since v1:
- Added helper to probe defer clients
- Fixed logical bug in slot scan
- Added SPDX header in header file

drivers/remoteproc/Kconfig | 3 +
drivers/remoteproc/Makefile | 1 +
drivers/remoteproc/qcom_pil_info.c | 150 +++++++++++++++++++++++++++++
drivers/remoteproc/qcom_pil_info.h | 8 ++
4 files changed, 162 insertions(+)
create mode 100644 drivers/remoteproc/qcom_pil_info.c
create mode 100644 drivers/remoteproc/qcom_pil_info.h

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 94afdde4bc9f..0798602e355a 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -85,6 +85,9 @@ config KEYSTONE_REMOTEPROC
It's safe to say N here if you're not interested in the Keystone
DSPs or just want to use a bare minimum kernel.

+config QCOM_PIL_INFO
+ tristate
+
config QCOM_RPROC_COMMON
tristate

diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 00f09e658cb3..c1b46e9033cb 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o
obj-$(CONFIG_WKUP_M3_RPROC) += wkup_m3_rproc.o
obj-$(CONFIG_DA8XX_REMOTEPROC) += da8xx_remoteproc.o
obj-$(CONFIG_KEYSTONE_REMOTEPROC) += keystone_remoteproc.o
+obj-$(CONFIG_QCOM_PIL_INFO) += qcom_pil_info.o
obj-$(CONFIG_QCOM_RPROC_COMMON) += qcom_common.o
obj-$(CONFIG_QCOM_Q6V5_COMMON) += qcom_q6v5.o
obj-$(CONFIG_QCOM_Q6V5_ADSP) += qcom_q6v5_adsp.o
diff --git a/drivers/remoteproc/qcom_pil_info.c b/drivers/remoteproc/qcom_pil_info.c
new file mode 100644
index 000000000000..b0897ae9eae5
--- /dev/null
+++ b/drivers/remoteproc/qcom_pil_info.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2019 Linaro Ltd.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/slab.h>
+
+struct pil_reloc_entry {
+ char name[8];
+ __le64 base;
+ __le32 size;
+} __packed;
+
+#define PIL_INFO_SIZE 200
+#define PIL_INFO_ENTRIES (PIL_INFO_SIZE / sizeof(struct pil_reloc_entry))
+
+struct pil_reloc {
+ struct device *dev;
+ struct regmap *map;
+ u32 offset;
+ int val_bytes;
+
+ struct pil_reloc_entry entries[PIL_INFO_ENTRIES];
+};
+
+static struct pil_reloc *_reloc;
+static DEFINE_MUTEX(reloc_mutex);
+
+/**
+ * qcom_pil_info_store() - store PIL information of image in IMEM
+ * @image: name of the image
+ * @base: base address of the loaded image
+ * @size: size of the loaded image
+ */
+void qcom_pil_info_store(const char *image, phys_addr_t base, size_t size)
+{
+ struct pil_reloc_entry *entry;
+ int idx = -1;
+ int i;
+
+ mutex_lock(&reloc_mutex);
+ if (!_reloc)
+ goto unlock;
+
+ for (i = 0; i < PIL_INFO_ENTRIES; i++) {
+ if (!_reloc->entries[i].name[0]) {
+ if (idx == -1)
+ idx = i;
+ continue;
+ }
+
+ if (!strncmp(_reloc->entries[i].name, image, 8)) {
+ idx = i;
+ goto found;
+ }
+ }
+
+ if (idx == -1) {
+ dev_warn(_reloc->dev, "insufficient PIL info slots\n");
+ goto unlock;
+ }
+
+found:
+ entry = &_reloc->entries[idx];
+ stracpy(entry->name, image);
+ entry->base = base;
+ entry->size = size;
+
+ regmap_bulk_write(_reloc->map, _reloc->offset + idx * sizeof(*entry),
+ entry, sizeof(*entry) / _reloc->val_bytes);
+
+unlock:
+ mutex_unlock(&reloc_mutex);
+}
+EXPORT_SYMBOL_GPL(qcom_pil_info_store);
+
+/**
+ * qcom_pil_info_available() - query if the pil info is probed
+ *
+ * Return: boolean indicating if the pil info device is probed
+ */
+bool qcom_pil_info_available(void)
+{
+ return !!_reloc;
+}
+EXPORT_SYMBOL_GPL(qcom_pil_info_available);
+
+static int pil_reloc_probe(struct platform_device *pdev)
+{
+ struct pil_reloc *reloc;
+
+ reloc = devm_kzalloc(&pdev->dev, sizeof(*reloc), GFP_KERNEL);
+ if (!reloc)
+ return -ENOMEM;
+
+ reloc->dev = &pdev->dev;
+ reloc->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
+ if (IS_ERR(reloc->map))
+ return PTR_ERR(reloc->map);
+
+ if (of_property_read_u32(pdev->dev.of_node, "offset", &reloc->offset))
+ return -EINVAL;
+
+ reloc->val_bytes = regmap_get_val_bytes(reloc->map);
+ if (reloc->val_bytes < 0)
+ return -EINVAL;
+
+ regmap_bulk_write(reloc->map, reloc->offset, reloc->entries,
+ sizeof(reloc->entries) / reloc->val_bytes);
+
+ mutex_lock(&reloc_mutex);
+ _reloc = reloc;
+ mutex_unlock(&reloc_mutex);
+
+ return 0;
+}
+
+static int pil_reloc_remove(struct platform_device *pdev)
+{
+ mutex_lock(&reloc_mutex);
+ _reloc = NULL;
+ mutex_unlock(&reloc_mutex);
+
+ return 0;
+}
+
+static const struct of_device_id pil_reloc_of_match[] = {
+ { .compatible = "qcom,pil-reloc-info" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, pil_reloc_of_match);
+
+static struct platform_driver pil_reloc_driver = {
+ .probe = pil_reloc_probe,
+ .remove = pil_reloc_remove,
+ .driver = {
+ .name = "qcom-pil-reloc-info",
+ .of_match_table = pil_reloc_of_match,
+ },
+};
+module_platform_driver(pil_reloc_driver);
+
+MODULE_DESCRIPTION("Qualcomm PIL relocation info");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/remoteproc/qcom_pil_info.h b/drivers/remoteproc/qcom_pil_info.h
new file mode 100644
index 000000000000..0372602fae1d
--- /dev/null
+++ b/drivers/remoteproc/qcom_pil_info.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __QCOM_PIL_INFO_H__
+#define __QCOM_PIL_INFO_H__
+
+void qcom_pil_info_store(const char *image, phys_addr_t base, size_t size);
+bool qcom_pil_info_available(void);
+
+#endif
--
2.24.0
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