[PATCH v4 06/11] remoteproc: uclass: Add remoteproc resource handling helpers
Amjad Ouled-Ameur
aouledameur at baylibre.com
Thu Jan 27 13:16:55 CET 2022
From: Keerthy <j-keerthy at ti.com>
Add remoteproc resource handling helpers. These functions
are primarily to parse the resource table and to handle
different types of resources. Carveout, devmem, trace &
vring resources are handled.
Signed-off-by: Keerthy <j-keerthy at ti.com>
[Amjad: fix redefinition of "struct resource_table" and compile warnings ]
Signed-off-by: Amjad Ouled-Ameur <aouledameur at baylibre.com>
---
(no changes since v2)
Changes in v2:
- Add useful checks and remove redundant code.
drivers/remoteproc/rproc-uclass.c | 534 ++++++++++++++++++++++++++++++
include/remoteproc.h | 384 ++++++++++++++++++++-
2 files changed, 917 insertions(+), 1 deletion(-)
diff --git a/drivers/remoteproc/rproc-uclass.c b/drivers/remoteproc/rproc-uclass.c
index 87e1ec7ad7f0..50bcc9030e98 100644
--- a/drivers/remoteproc/rproc-uclass.c
+++ b/drivers/remoteproc/rproc-uclass.c
@@ -8,15 +8,31 @@
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <common.h>
+#include <elf.h>
#include <errno.h>
#include <log.h>
#include <malloc.h>
+#include <virtio_ring.h>
#include <remoteproc.h>
#include <asm/io.h>
#include <dm/device-internal.h>
#include <dm.h>
#include <dm/uclass.h>
#include <dm/uclass-internal.h>
+#include <linux/compat.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+struct resource_table {
+ u32 ver;
+ u32 num;
+ u32 reserved[2];
+ u32 offset[0];
+} __packed;
+
+typedef int (*handle_resource_t) (struct udevice *, void *, int offset, int avail);
+
+static struct resource_table *rsc_table;
/**
* for_each_remoteproc_device() - iterate through the list of rproc devices
@@ -196,6 +212,80 @@ static int rproc_post_probe(struct udevice *dev)
return 0;
}
+/**
+ * rproc_add_res() - After parsing the resource table add the mappings
+ * @dev: device we finished probing
+ * @mapping: rproc_mem_entry for the resource
+ *
+ * Return: if the remote proc driver has a add_res routine, invokes it and
+ * hands over the return value. overall, 0 if all went well, else appropriate
+ * error value.
+ */
+static int rproc_add_res(struct udevice *dev, struct rproc_mem_entry *mapping)
+{
+ const struct dm_rproc_ops *ops = rproc_get_ops(dev);
+
+ if (!ops->add_res)
+ return -ENOSYS;
+
+ return ops->add_res(dev, mapping);
+}
+
+/**
+ * rproc_alloc_mem() - After parsing the resource table allocat mem
+ * @dev: device we finished probing
+ * @len: rproc_mem_entry for the resource
+ * @align: alignment for the resource
+ *
+ * Return: if the remote proc driver has a add_res routine, invokes it and
+ * hands over the return value. overall, 0 if all went well, else appropriate
+ * error value.
+ */
+static void *rproc_alloc_mem(struct udevice *dev, unsigned long len,
+ unsigned long align)
+{
+ const struct dm_rproc_ops *ops;
+
+ ops = rproc_get_ops(dev);
+ if (!ops) {
+ debug("%s driver has no ops?\n", dev->name);
+ return NULL;
+ }
+
+ if (ops->alloc_mem)
+ return ops->alloc_mem(dev, len, align);
+
+ return NULL;
+}
+
+/**
+ * rproc_config_pagetable() - Configure page table for remote processor
+ * @dev: device we finished probing
+ * @virt: Virtual address of the resource
+ * @phys: Physical address the resource
+ * @len: length the resource
+ *
+ * Return: if the remote proc driver has a add_res routine, invokes it and
+ * hands over the return value. overall, 0 if all went well, else appropriate
+ * error value.
+ */
+static int rproc_config_pagetable(struct udevice *dev, unsigned int virt,
+ unsigned int phys, unsigned int len)
+{
+ const struct dm_rproc_ops *ops;
+
+ ops = rproc_get_ops(dev);
+ if (!ops) {
+ debug("%s driver has no ops?\n", dev->name);
+ return -EINVAL;
+ }
+
+ if (ops->config_pagetable)
+ return ops->config_pagetable(dev, virt, phys, len);
+
+ return 0;
+}
+
UCLASS_DRIVER(rproc) = {
.id = UCLASS_REMOTEPROC,
.name = "remoteproc",
@@ -426,3 +516,447 @@ int rproc_is_running(int id)
{
return _rproc_ops_wrapper(id, RPROC_RUNNING);
};
+
+
+static int handle_trace(struct udevice *dev, struct fw_rsc_trace *rsc,
+ int offset, int avail)
+{
+ if (sizeof(*rsc) > avail) {
+ debug("trace rsc is truncated\n");
+ return -EINVAL;
+ }
+
+ /*
+ * make sure reserved bytes are zeroes
+ */
+ if (rsc->reserved) {
+ debug("trace rsc has non zero reserved bytes\n");
+ return -EINVAL;
+ }
+
+ debug("trace rsc: da 0x%x, len 0x%x\n", rsc->da, rsc->len);
+
+ return 0;
+}
+
+static int handle_devmem(struct udevice *dev, struct fw_rsc_devmem *rsc,
+ int offset, int avail)
+{
+ struct rproc_mem_entry *mapping;
+
+ if (sizeof(*rsc) > avail) {
+ debug("devmem rsc is truncated\n");
+ return -EINVAL;
+ }
+
+ /*
+ * make sure reserved bytes are zeroes
+ */
+ if (rsc->reserved) {
+ debug("devmem rsc has non zero reserved bytes\n");
+ return -EINVAL;
+ }
+
+ debug("devmem rsc: pa 0x%x, da 0x%x, len 0x%x\n",
+ rsc->pa, rsc->da, rsc->len);
+
+ rproc_config_pagetable(dev, rsc->da, rsc->pa, rsc->len);
+
+ mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+ if (!mapping)
+ return -ENOMEM;
+
+ /*
+ * We'll need this info later when we'll want to unmap everything
+ * (e.g. on shutdown).
+ *
+ * We can't trust the remote processor not to change the resource
+ * table, so we must maintain this info independently.
+ */
+ mapping->dma = rsc->pa;
+ mapping->da = rsc->da;
+ mapping->len = rsc->len;
+ rproc_add_res(dev, mapping);
+
+ debug("mapped devmem pa 0x%x, da 0x%x, len 0x%x\n",
+ rsc->pa, rsc->da, rsc->len);
+
+ return 0;
+}
+
+static int handle_carveout(struct udevice *dev, struct fw_rsc_carveout *rsc,
+ int offset, int avail)
+{
+ struct rproc_mem_entry *mapping;
+
+ if (sizeof(*rsc) > avail) {
+ debug("carveout rsc is truncated\n");
+ return -EINVAL;
+ }
+
+ /*
+ * make sure reserved bytes are zeroes
+ */
+ if (rsc->reserved) {
+ debug("carveout rsc has non zero reserved bytes\n");
+ return -EINVAL;
+ }
+
+ debug("carveout rsc: da %x, pa %x, len %x, flags %x\n",
+ rsc->da, rsc->pa, rsc->len, rsc->flags);
+
+ rsc->pa = (uintptr_t)rproc_alloc_mem(dev, rsc->len, 8);
+ if (!rsc->pa) {
+ debug
+ ("failed to allocate carveout rsc: da %x, pa %x, len %x, flags %x\n",
+ rsc->da, rsc->pa, rsc->len, rsc->flags);
+ return -ENOMEM;
+ }
+ rproc_config_pagetable(dev, rsc->da, rsc->pa, rsc->len);
+
+ /*
+ * Ok, this is non-standard.
+ *
+ * Sometimes we can't rely on the generic iommu-based DMA API
+ * to dynamically allocate the device address and then set the IOMMU
+ * tables accordingly, because some remote processors might
+ * _require_ us to use hard coded device addresses that their
+ * firmware was compiled with.
+ *
+ * In this case, we must use the IOMMU API directly and map
+ * the memory to the device address as expected by the remote
+ * processor.
+ *
+ * Obviously such remote processor devices should not be configured
+ * to use the iommu-based DMA API: we expect 'dma' to contain the
+ * physical address in this case.
+ */
+ mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+ if (!mapping)
+ return -ENOMEM;
+
+ /*
+ * We'll need this info later when we'll want to unmap
+ * everything (e.g. on shutdown).
+ *
+ * We can't trust the remote processor not to change the
+ * resource table, so we must maintain this info independently.
+ */
+ mapping->dma = rsc->pa;
+ mapping->da = rsc->da;
+ mapping->len = rsc->len;
+ rproc_add_res(dev, mapping);
+
+ debug("carveout mapped 0x%x to 0x%x\n", rsc->da, rsc->pa);
+
+ return 0;
+}
+
+#define RPROC_PAGE_SHIFT 12
+#define RPROC_PAGE_SIZE BIT(RPROC_PAGE_SHIFT)
+#define RPROC_PAGE_ALIGN(x) (((x) + (RPROC_PAGE_SIZE - 1)) & ~(RPROC_PAGE_SIZE - 1))
+
+static int alloc_vring(struct udevice *dev, struct fw_rsc_vdev *rsc, int i)
+{
+ struct fw_rsc_vdev_vring *vring = &rsc->vring[i];
+ int size;
+ int order;
+ void *pa;
+
+ debug("vdev rsc: vring%d: da %x, qsz %d, align %d\n",
+ i, vring->da, vring->num, vring->align);
+
+ /*
+ * verify queue size and vring alignment are sane
+ */
+ if (!vring->num || !vring->align) {
+ debug("invalid qsz (%d) or alignment (%d)\n", vring->num,
+ vring->align);
+ return -EINVAL;
+ }
+
+ /*
+ * actual size of vring (in bytes)
+ */
+ size = RPROC_PAGE_ALIGN(vring_size(vring->num, vring->align));
+ order = vring->align >> RPROC_PAGE_SHIFT;
+
+ pa = rproc_alloc_mem(dev, size, order);
+ if (!pa) {
+ debug("failed to allocate vring rsc\n");
+ return -ENOMEM;
+ }
+ debug("alloc_mem(%#x, %d): %p\n", size, order, pa);
+ vring->da = (uintptr_t)pa;
+
+ return !pa;
+}
+
+static int handle_vdev(struct udevice *dev, struct fw_rsc_vdev *rsc,
+ int offset, int avail)
+{
+ int i, ret;
+ void *pa;
+
+ /*
+ * make sure resource isn't truncated
+ */
+ if (sizeof(*rsc) + rsc->num_of_vrings * sizeof(struct fw_rsc_vdev_vring)
+ + rsc->config_len > avail) {
+ debug("vdev rsc is truncated\n");
+ return -EINVAL;
+ }
+
+ /*
+ * make sure reserved bytes are zeroes
+ */
+ if (rsc->reserved[0] || rsc->reserved[1]) {
+ debug("vdev rsc has non zero reserved bytes\n");
+ return -EINVAL;
+ }
+
+ debug("vdev rsc: id %d, dfeatures %x, cfg len %d, %d vrings\n",
+ rsc->id, rsc->dfeatures, rsc->config_len, rsc->num_of_vrings);
+
+ /*
+ * we currently support only two vrings per rvdev
+ */
+ if (rsc->num_of_vrings > 2) {
+ debug("too many vrings: %d\n", rsc->num_of_vrings);
+ return -EINVAL;
+ }
+
+ /*
+ * allocate the vrings
+ */
+ for (i = 0; i < rsc->num_of_vrings; i++) {
+ ret = alloc_vring(dev, rsc, i);
+ if (ret)
+ goto alloc_error;
+ }
+
+ pa = rproc_alloc_mem(dev, RPMSG_TOTAL_BUF_SPACE, 6);
+ if (!pa) {
+ debug("failed to allocate vdev rsc\n");
+ return -ENOMEM;
+ }
+ debug("vring buffer alloc_mem(%#x, 6): %p\n", RPMSG_TOTAL_BUF_SPACE,
+ pa);
+
+ return 0;
+
+ alloc_error:
+ return ret;
+}
+
+/*
+ * A lookup table for resource handlers. The indices are defined in
+ * enum fw_resource_type.
+ */
+static handle_resource_t loading_handlers[RSC_LAST] = {
+ [RSC_CARVEOUT] = (handle_resource_t)handle_carveout,
+ [RSC_DEVMEM] = (handle_resource_t)handle_devmem,
+ [RSC_TRACE] = (handle_resource_t)handle_trace,
+ [RSC_VDEV] = (handle_resource_t)handle_vdev,
+};
+
+/*
+ * handle firmware resource entries before booting the remote processor
+ */
+static int handle_resources(struct udevice *dev, int len,
+ handle_resource_t handlers[RSC_LAST])
+{
+ handle_resource_t handler;
+ int ret = 0, i;
+
+ for (i = 0; i < rsc_table->num; i++) {
+ int offset = rsc_table->offset[i];
+ struct fw_rsc_hdr *hdr = (void *)rsc_table + offset;
+ int avail = len - offset - sizeof(*hdr);
+ void *rsc = (void *)hdr + sizeof(*hdr);
+
+ /*
+ * make sure table isn't truncated
+ */
+ if (avail < 0) {
+ debug("rsc table is truncated\n");
+ return -EINVAL;
+ }
+
+ debug("rsc: type %d\n", hdr->type);
+
+ if (hdr->type >= RSC_LAST) {
+ debug("unsupported resource %d\n", hdr->type);
+ continue;
+ }
+
+ handler = handlers[hdr->type];
+ if (!handler)
+ continue;
+
+ ret = handler(dev, rsc, offset + sizeof(*hdr), avail);
+ if (ret)
+ break;
+ }
+
+ return ret;
+}
+
+static int
+handle_intmem_to_l3_mapping(struct udevice *dev,
+ struct rproc_intmem_to_l3_mapping *l3_mapping)
+{
+ u32 i = 0;
+
+ for (i = 0; i < l3_mapping->num_entries; i++) {
+ struct l3_map *curr_map = &l3_mapping->mappings[i];
+ struct rproc_mem_entry *mapping;
+
+ mapping = kzalloc(sizeof(*mapping), GFP_KERNEL);
+ if (!mapping)
+ return -ENOMEM;
+
+ mapping->dma = curr_map->l3_addr;
+ mapping->da = curr_map->priv_addr;
+ mapping->len = curr_map->len;
+ rproc_add_res(dev, mapping);
+ }
+
+ return 0;
+}
+
+static Elf32_Shdr *rproc_find_table(unsigned int addr)
+{
+ Elf32_Ehdr *ehdr; /* Elf header structure pointer */
+ Elf32_Shdr *shdr; /* Section header structure pointer */
+ Elf32_Shdr sectionheader;
+ int i;
+ u8 *elf_data;
+ char *name_table;
+ struct resource_table *ptable;
+
+ ehdr = (Elf32_Ehdr *)(uintptr_t)addr;
+ elf_data = (u8 *)ehdr;
+ shdr = (Elf32_Shdr *)(elf_data + ehdr->e_shoff);
+ memcpy(§ionheader, &shdr[ehdr->e_shstrndx], sizeof(sectionheader));
+ name_table = (char *)(elf_data + sectionheader.sh_offset);
+
+ for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
+ memcpy(§ionheader, shdr, sizeof(sectionheader));
+ u32 size = sectionheader.sh_size;
+ u32 offset = sectionheader.sh_offset;
+
+ if (strcmp
+ (name_table + sectionheader.sh_name, ".resource_table"))
+ continue;
+
+ ptable = (struct resource_table *)(elf_data + offset);
+
+ /*
+ * make sure table has at least the header
+ */
+ if (sizeof(struct resource_table) > size) {
+ debug("header-less resource table\n");
+ return NULL;
+ }
+
+ /*
+ * we don't support any version beyond the first
+ */
+ if (ptable->ver != 1) {
+ debug("unsupported fw ver: %d\n", ptable->ver);
+ return NULL;
+ }
+
+ /*
+ * make sure reserved bytes are zeroes
+ */
+ if (ptable->reserved[0] || ptable->reserved[1]) {
+ debug("non zero reserved bytes\n");
+ return NULL;
+ }
+
+ /*
+ * make sure the offsets array isn't truncated
+ */
+ if (ptable->num * sizeof(ptable->offset[0]) +
+ sizeof(struct resource_table) > size) {
+ debug("resource table incomplete\n");
+ return NULL;
+ }
+
+ return shdr;
+ }
+
+ return NULL;
+}
+
+struct resource_table *rproc_find_resource_table(struct udevice *dev,
+ unsigned int addr,
+ int *tablesz)
+{
+ Elf32_Shdr *shdr;
+ Elf32_Shdr sectionheader;
+ struct resource_table *ptable;
+ u8 *elf_data = (u8 *)(uintptr_t)addr;
+
+ shdr = rproc_find_table(addr);
+ if (!shdr) {
+ debug("%s: failed to get resource section header\n", __func__);
+ return NULL;
+ }
+
+ memcpy(§ionheader, shdr, sizeof(sectionheader));
+ ptable = (struct resource_table *)(elf_data + sectionheader.sh_offset);
+ if (tablesz)
+ *tablesz = sectionheader.sh_size;
+
+ return ptable;
+}
+
+unsigned long rproc_parse_resource_table(struct udevice *dev, struct rproc *cfg)
+{
+ struct resource_table *ptable = NULL;
+ int tablesz;
+ int ret;
+ unsigned long addr;
+
+ addr = cfg->load_addr;
+
+ ptable = rproc_find_resource_table(dev, addr, &tablesz);
+ if (!ptable) {
+ debug("%s : failed to find resource table\n", __func__);
+ return 0;
+ }
+
+ debug("%s : found resource table\n", __func__);
+ rsc_table = kzalloc(tablesz, GFP_KERNEL);
+ if (!rsc_table) {
+ debug("resource table alloc failed!\n");
+ return 0;
+ }
+
+ /*
+ * Copy the resource table into a local buffer before handling the
+ * resource table.
+ */
+ memcpy(rsc_table, ptable, tablesz);
+ if (cfg->intmem_to_l3_mapping)
+ handle_intmem_to_l3_mapping(dev, cfg->intmem_to_l3_mapping);
+ ret = handle_resources(dev, tablesz, loading_handlers);
+ if (ret) {
+ debug("handle_resources failed: %d\n", ret);
+ return 0;
+ }
+
+ /*
+ * Instead of trying to mimic the kernel flow of copying the
+ * processed resource table into its post ELF load location in DDR
+ * copying it into its original location.
+ */
+ memcpy(ptable, rsc_table, tablesz);
+ free(rsc_table);
+ rsc_table = NULL;
+
+ return 1;
+}
diff --git a/include/remoteproc.h b/include/remoteproc.h
index 089131f65fde..1a970bc23c52 100644
--- a/include/remoteproc.h
+++ b/include/remoteproc.h
@@ -1,4 +1,4 @@
-/* SPDX-License-Identifier: GPL-2.0+ */
+/* SPDX-License-Identifier: GPL-2.0 */
/*
* (C) Copyright 2015
* Texas Instruments Incorporated - http://www.ti.com/
@@ -15,6 +15,375 @@
*/
#include <dm/platdata.h> /* For platform data support - non dt world */
+/**
+ * struct fw_rsc_hdr - firmware resource entry header
+ * @type: resource type
+ * @data: resource data
+ *
+ * Every resource entry begins with a 'struct fw_rsc_hdr' header providing
+ * its @type. The content of the entry itself will immediately follow
+ * this header, and it should be parsed according to the resource type.
+ */
+struct fw_rsc_hdr {
+ u32 type;
+ u8 data[0];
+};
+
+/**
+ * enum fw_resource_type - types of resource entries
+ *
+ * @RSC_CARVEOUT: request for allocation of a physically contiguous
+ * memory region.
+ * @RSC_DEVMEM: request to iommu_map a memory-based peripheral.
+ * @RSC_TRACE: announces the availability of a trace buffer into which
+ * the remote processor will be writing logs.
+ * @RSC_VDEV: declare support for a virtio device, and serve as its
+ * virtio header.
+ * @RSC_PRELOAD_VENDOR: a vendor resource type that needs to be handled by
+ * remoteproc implementations before loading
+ * @RSC_POSTLOAD_VENDOR: a vendor resource type that needs to be handled by
+ * remoteproc implementations after loading
+ * @RSC_LAST: just keep this one at the end
+ *
+ * For more details regarding a specific resource type, please see its
+ * dedicated structure below.
+ *
+ * Please note that these values are used as indices to the rproc_handle_rsc
+ * lookup table, so please keep them sane. Moreover, @RSC_LAST is used to
+ * check the validity of an index before the lookup table is accessed, so
+ * please update it as needed.
+ */
+enum fw_resource_type {
+ RSC_CARVEOUT = 0,
+ RSC_DEVMEM = 1,
+ RSC_TRACE = 2,
+ RSC_VDEV = 3,
+ RSC_PRELOAD_VENDOR = 4,
+ RSC_POSTLOAD_VENDOR = 5,
+ RSC_LAST = 6,
+};
+
+#define FW_RSC_ADDR_ANY (-1)
+
+/**
+ * struct fw_rsc_carveout - physically contiguous memory request
+ * @da: device address
+ * @pa: physical address
+ * @len: length (in bytes)
+ * @flags: iommu protection flags
+ * @reserved: reserved (must be zero)
+ * @name: human-readable name of the requested memory region
+ *
+ * This resource entry requests the host to allocate a physically contiguous
+ * memory region.
+ *
+ * These request entries should precede other firmware resource entries,
+ * as other entries might request placing other data objects inside
+ * these memory regions (e.g. data/code segments, trace resource entries, ...).
+ *
+ * Allocating memory this way helps utilizing the reserved physical memory
+ * (e.g. CMA) more efficiently, and also minimizes the number of TLB entries
+ * needed to map it (in case @rproc is using an IOMMU). Reducing the TLB
+ * pressure is important; it may have a substantial impact on performance.
+ *
+ * If the firmware is compiled with static addresses, then @da should specify
+ * the expected device address of this memory region. If @da is set to
+ * FW_RSC_ADDR_ANY, then the host will dynamically allocate it, and then
+ * overwrite @da with the dynamically allocated address.
+ *
+ * We will always use @da to negotiate the device addresses, even if it
+ * isn't using an iommu. In that case, though, it will obviously contain
+ * physical addresses.
+ *
+ * Some remote processors needs to know the allocated physical address
+ * even if they do use an iommu. This is needed, e.g., if they control
+ * hardware accelerators which access the physical memory directly (this
+ * is the case with OMAP4 for instance). In that case, the host will
+ * overwrite @pa with the dynamically allocated physical address.
+ * Generally we don't want to expose physical addresses if we don't have to
+ * (remote processors are generally _not_ trusted), so we might want to
+ * change this to happen _only_ when explicitly required by the hardware.
+ *
+ * @flags is used to provide IOMMU protection flags, and @name should
+ * (optionally) contain a human readable name of this carveout region
+ * (mainly for debugging purposes).
+ */
+struct fw_rsc_carveout {
+ u32 da;
+ u32 pa;
+ u32 len;
+ u32 flags;
+ u32 reserved;
+ u8 name[32];
+};
+
+/**
+ * struct fw_rsc_devmem - iommu mapping request
+ * @da: device address
+ * @pa: physical address
+ * @len: length (in bytes)
+ * @flags: iommu protection flags
+ * @reserved: reserved (must be zero)
+ * @name: human-readable name of the requested region to be mapped
+ *
+ * This resource entry requests the host to iommu map a physically contiguous
+ * memory region. This is needed in case the remote processor requires
+ * access to certain memory-based peripherals; _never_ use it to access
+ * regular memory.
+ *
+ * This is obviously only needed if the remote processor is accessing memory
+ * via an iommu.
+ *
+ * @da should specify the required device address, @pa should specify
+ * the physical address we want to map, @len should specify the size of
+ * the mapping and @flags is the IOMMU protection flags. As always, @name may
+ * (optionally) contain a human readable name of this mapping (mainly for
+ * debugging purposes).
+ *
+ * Note: at this point we just "trust" those devmem entries to contain valid
+ * physical addresses, but this isn't safe and will be changed: eventually we
+ * want remoteproc implementations to provide us ranges of physical addresses
+ * the firmware is allowed to request, and not allow firmwares to request
+ * access to physical addresses that are outside those ranges.
+ */
+struct fw_rsc_devmem {
+ u32 da;
+ u32 pa;
+ u32 len;
+ u32 flags;
+ u32 reserved;
+ u8 name[32];
+};
+
+/**
+ * struct fw_rsc_trace - trace buffer declaration
+ * @da: device address
+ * @len: length (in bytes)
+ * @reserved: reserved (must be zero)
+ * @name: human-readable name of the trace buffer
+ *
+ * This resource entry provides the host information about a trace buffer
+ * into which the remote processor will write log messages.
+ *
+ * @da specifies the device address of the buffer, @len specifies
+ * its size, and @name may contain a human readable name of the trace buffer.
+ *
+ * After booting the remote processor, the trace buffers are exposed to the
+ * user via debugfs entries (called trace0, trace1, etc..).
+ */
+struct fw_rsc_trace {
+ u32 da;
+ u32 len;
+ u32 reserved;
+ u8 name[32];
+};
+
+/**
+ * struct fw_rsc_vdev_vring - vring descriptor entry
+ * @da: device address
+ * @align: the alignment between the consumer and producer parts of the vring
+ * @num: num of buffers supported by this vring (must be power of two)
+ * @notifyid is a unique rproc-wide notify index for this vring. This notify
+ * index is used when kicking a remote processor, to let it know that this
+ * vring is triggered.
+ * @pa: physical address
+ *
+ * This descriptor is not a resource entry by itself; it is part of the
+ * vdev resource type (see below).
+ *
+ * Note that @da should either contain the device address where
+ * the remote processor is expecting the vring, or indicate that
+ * dynamically allocation of the vring's device address is supported.
+ */
+struct fw_rsc_vdev_vring {
+ u32 da;
+ u32 align;
+ u32 num;
+ u32 notifyid;
+ u32 pa;
+};
+
+/**
+ * struct fw_rsc_vdev - virtio device header
+ * @id: virtio device id (as in virtio_ids.h)
+ * @notifyid is a unique rproc-wide notify index for this vdev. This notify
+ * index is used when kicking a remote processor, to let it know that the
+ * status/features of this vdev have changes.
+ * @dfeatures specifies the virtio device features supported by the firmware
+ * @gfeatures is a place holder used by the host to write back the
+ * negotiated features that are supported by both sides.
+ * @config_len is the size of the virtio config space of this vdev. The config
+ * space lies in the resource table immediate after this vdev header.
+ * @status is a place holder where the host will indicate its virtio progress.
+ * @num_of_vrings indicates how many vrings are described in this vdev header
+ * @reserved: reserved (must be zero)
+ * @vring is an array of @num_of_vrings entries of 'struct fw_rsc_vdev_vring'.
+ *
+ * This resource is a virtio device header: it provides information about
+ * the vdev, and is then used by the host and its peer remote processors
+ * to negotiate and share certain virtio properties.
+ *
+ * By providing this resource entry, the firmware essentially asks remoteproc
+ * to statically allocate a vdev upon registration of the rproc (dynamic vdev
+ * allocation is not yet supported).
+ *
+ * Note: unlike virtualization systems, the term 'host' here means
+ * the Linux side which is running remoteproc to control the remote
+ * processors. We use the name 'gfeatures' to comply with virtio's terms,
+ * though there isn't really any virtualized guest OS here: it's the host
+ * which is responsible for negotiating the final features.
+ * Yeah, it's a bit confusing.
+ *
+ * Note: immediately following this structure is the virtio config space for
+ * this vdev (which is specific to the vdev; for more info, read the virtio
+ * spec). the size of the config space is specified by @config_len.
+ */
+struct fw_rsc_vdev {
+ u32 id;
+ u32 notifyid;
+ u32 dfeatures;
+ u32 gfeatures;
+ u32 config_len;
+ u8 status;
+ u8 num_of_vrings;
+ u8 reserved[2];
+ struct fw_rsc_vdev_vring vring[0];
+};
+
+/**
+ * struct rproc_mem_entry - memory entry descriptor
+ * @va: virtual address
+ * @dma: dma address
+ * @len: length, in bytes
+ * @da: device address
+ * @priv: associated data
+ * @name: associated memory region name (optional)
+ * @node: list node
+ */
+struct rproc_mem_entry {
+ void *va;
+ dma_addr_t dma;
+ int len;
+ u32 da;
+ void *priv;
+ char name[32];
+ struct list_head node;
+};
+
+struct rproc;
+
+typedef u32(*init_func_proto) (u32 core_id, struct rproc *cfg);
+
+struct l3_map {
+ u32 priv_addr;
+ u32 l3_addr;
+ u32 len;
+};
+
+struct rproc_intmem_to_l3_mapping {
+ u32 num_entries;
+ struct l3_map mappings[16];
+};
+
+/**
+ * enum rproc_crash_type - remote processor crash types
+ * @RPROC_MMUFAULT: iommu fault
+ * @RPROC_WATCHDOG: watchdog bite
+ * @RPROC_FATAL_ERROR fatal error
+ *
+ * Each element of the enum is used as an array index. So that, the value of
+ * the elements should be always something sane.
+ *
+ * Feel free to add more types when needed.
+ */
+enum rproc_crash_type {
+ RPROC_MMUFAULT,
+ RPROC_WATCHDOG,
+ RPROC_FATAL_ERROR,
+};
+
+/* we currently support only two vrings per rvdev */
+#define RVDEV_NUM_VRINGS 2
+
+#define RPMSG_NUM_BUFS (512)
+#define RPMSG_BUF_SIZE (512)
+#define RPMSG_TOTAL_BUF_SPACE (RPMSG_NUM_BUFS * RPMSG_BUF_SIZE)
+
+/**
+ * struct rproc_vring - remoteproc vring state
+ * @va: virtual address
+ * @dma: dma address
+ * @len: length, in bytes
+ * @da: device address
+ * @align: vring alignment
+ * @notifyid: rproc-specific unique vring index
+ * @rvdev: remote vdev
+ * @vq: the virtqueue of this vring
+ */
+struct rproc_vring {
+ void *va;
+ dma_addr_t dma;
+ int len;
+ u32 da;
+ u32 align;
+ int notifyid;
+ struct rproc_vdev *rvdev;
+ struct virtqueue *vq;
+};
+
+/** struct rproc - structure with all processor specific information for
+ * loading remotecore from boot loader.
+ *
+ * @num_iommus: Number of IOMMUs for this remote core. Zero indicates that the
+ * processor does not have an IOMMU.
+ *
+ * @cma_base: Base address of the carveout for this remotecore.
+ *
+ * @cma_size: Length of the carveout in bytes.
+ *
+ * @page_table_addr: array with the physical address of the page table. We are
+ * using the same page table for both IOMMU's. There is currently no strong
+ * usecase for maintaining different page tables for different MMU's servicing
+ * the same CPU.
+ *
+ * @mmu_base_addr: base address of the MMU
+ *
+ * @entry_point: address that is the entry point for the remote core. This
+ * address is in the memory view of the remotecore.
+ *
+ * @load_addr: Address to which the bootloader loads the firmware from
+ * persistent storage before invoking the ELF loader. Keeping this address
+ * configurable allows future optimizations such as loading the firmware from
+ * storage for remotecore2 via EDMA while the CPU is processing the ELF image
+ * of remotecore1. This address is in the memory view of the A15.
+ *
+ * @firmware_name: Name of the file that is expected to contain the ELF image.
+ *
+ * @has_rsc_table: Flag populated after parsing the ELF binary on target.
+ */
+
+struct rproc {
+ u32 num_iommus;
+ unsigned long cma_base;
+ u32 cma_size;
+ unsigned long page_table_addr;
+ unsigned long mmu_base_addr[2];
+ unsigned long load_addr;
+ unsigned long entry_point;
+ char *core_name;
+ char *firmware_name;
+ char *ptn;
+ init_func_proto start_clocks;
+ init_func_proto config_mmu;
+ init_func_proto config_peripherals;
+ init_func_proto start_core;
+ u32 has_rsc_table;
+ struct rproc_intmem_to_l3_mapping *intmem_to_l3_mapping;
+ u32 trace_pa;
+ u32 trace_len;
+};
+
+extern struct rproc *rproc_cfg_arr[2];
/**
* enum rproc_mem_type - What type of memory model does the rproc use
* @RPROC_INTERNAL_MEMORY_MAPPED: Remote processor uses own memory and is memory
@@ -126,6 +495,12 @@ struct dm_rproc_ops {
* @return virtual address.
*/
void * (*device_to_virt)(struct udevice *dev, ulong da, ulong size);
+ int (*add_res)(struct udevice *dev,
+ struct rproc_mem_entry *mapping);
+ void * (*alloc_mem)(struct udevice *dev, unsigned long len,
+ unsigned long align);
+ unsigned int (*config_pagetable)(struct udevice *dev, unsigned int virt,
+ unsigned int phys, unsigned int len);
};
/* Accessor */
@@ -322,6 +697,13 @@ int rproc_elf64_load_rsc_table(struct udevice *dev, ulong fw_addr,
*/
int rproc_elf_load_rsc_table(struct udevice *dev, ulong fw_addr,
ulong fw_size, ulong *rsc_addr, ulong *rsc_size);
+
+unsigned long rproc_parse_resource_table(struct udevice *dev,
+ struct rproc *cfg);
+
+struct resource_table *rproc_find_resource_table(struct udevice *dev,
+ unsigned int addr,
+ int *tablesz);
#else
static inline int rproc_init(void) { return -ENOSYS; }
static inline int rproc_dev_init(int id) { return -ENOSYS; }
--
2.25.1
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