diff options
Diffstat (limited to 'drivers/remoteproc')
| -rw-r--r-- | drivers/remoteproc/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/remoteproc/remoteproc_core.c | 98 |
2 files changed, 79 insertions, 20 deletions
diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig index cc1f7bf53fd0..289e867a77dd 100644 --- a/drivers/remoteproc/Kconfig +++ b/drivers/remoteproc/Kconfig @@ -4,6 +4,7 @@ menu "Remoteproc drivers" config REMOTEPROC tristate depends on HAS_DMA + select CRC32 select FW_CONFIG select VIRTIO diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 9d2a4ac6c706..617b825aa553 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -37,6 +37,7 @@ #include <linux/iommu.h> #include <linux/idr.h> #include <linux/elf.h> +#include <linux/crc32.h> #include <linux/virtio_ids.h> #include <linux/virtio_ring.h> #include <asm/byteorder.h> @@ -45,7 +46,8 @@ typedef int (*rproc_handle_resources_t)(struct rproc *rproc, struct resource_table *table, int len); -typedef int (*rproc_handle_resource_t)(struct rproc *rproc, void *, int avail); +typedef int (*rproc_handle_resource_t)(struct rproc *rproc, + void *, int offset, int avail); /* Unique indices for remoteproc devices */ static DEFINE_IDA(rproc_dev_index); @@ -302,7 +304,7 @@ void rproc_free_vring(struct rproc_vring *rvring) * Returns 0 on success, or an appropriate error code otherwise */ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, - int avail) + int offset, int avail) { struct device *dev = &rproc->dev; struct rproc_vdev *rvdev; @@ -346,6 +348,9 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, /* remember the device features */ rvdev->dfeatures = rsc->dfeatures; + /* remember the resource offset*/ + rvdev->rsc_offset = offset; + list_add_tail(&rvdev->node, &rproc->rvdevs); /* it is now safe to add the virtio device */ @@ -377,7 +382,7 @@ free_rvdev: * Returns 0 on success, or an appropriate error code otherwise */ static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc, - int avail) + int offset, int avail) { struct rproc_mem_entry *trace; struct device *dev = &rproc->dev; @@ -459,7 +464,7 @@ static int rproc_handle_trace(struct rproc *rproc, struct fw_rsc_trace *rsc, * are outside those ranges. */ static int rproc_handle_devmem(struct rproc *rproc, struct fw_rsc_devmem *rsc, - int avail) + int offset, int avail) { struct rproc_mem_entry *mapping; struct device *dev = &rproc->dev; @@ -532,7 +537,9 @@ out: * pressure is important; it may have a substantial impact on performance. */ static int rproc_handle_carveout(struct rproc *rproc, - struct fw_rsc_carveout *rsc, int avail) + struct fw_rsc_carveout *rsc, + int offset, int avail) + { struct rproc_mem_entry *carveout, *mapping; struct device *dev = &rproc->dev; @@ -655,7 +662,7 @@ free_carv: } static int rproc_count_vrings(struct rproc *rproc, struct fw_rsc_vdev *rsc, - int avail) + int offset, int avail) { /* Summarize the number of notification IDs */ rproc->max_notifyid += rsc->num_of_vrings; @@ -683,17 +690,16 @@ static rproc_handle_resource_t rproc_count_vrings_handler[RSC_LAST] = { }; /* handle firmware resource entries before booting the remote processor */ -static int rproc_handle_resources(struct rproc *rproc, - struct resource_table *table, int len, +static int rproc_handle_resources(struct rproc *rproc, int len, rproc_handle_resource_t handlers[RSC_LAST]) { struct device *dev = &rproc->dev; rproc_handle_resource_t handler; int ret = 0, i; - for (i = 0; i < table->num; i++) { - int offset = table->offset[i]; - struct fw_rsc_hdr *hdr = (void *)table + offset; + for (i = 0; i < rproc->table_ptr->num; i++) { + int offset = rproc->table_ptr->offset[i]; + struct fw_rsc_hdr *hdr = (void *)rproc->table_ptr + offset; int avail = len - offset - sizeof(*hdr); void *rsc = (void *)hdr + sizeof(*hdr); @@ -714,7 +720,7 @@ static int rproc_handle_resources(struct rproc *rproc, if (!handler) continue; - ret = handler(rproc, rsc, avail); + ret = handler(rproc, rsc, offset + sizeof(*hdr), avail); if (ret) break; } @@ -772,9 +778,12 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw) { struct device *dev = &rproc->dev; const char *name = rproc->firmware; - struct resource_table *table; + struct resource_table *table, *loaded_table; int ret, tablesz; + if (!rproc->table_ptr) + return -ENOMEM; + ret = rproc_fw_sanity_check(rproc, fw); if (ret) return ret; @@ -800,9 +809,15 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw) goto clean_up; } + /* Verify that resource table in loaded fw is unchanged */ + if (rproc->table_csum != crc32(0, table, tablesz)) { + dev_err(dev, "resource checksum failed, fw changed?\n"); + ret = -EINVAL; + goto clean_up; + } + /* handle fw resources which are required to boot rproc */ - ret = rproc_handle_resources(rproc, table, tablesz, - rproc_loading_handlers); + ret = rproc_handle_resources(rproc, tablesz, rproc_loading_handlers); if (ret) { dev_err(dev, "Failed to process resources: %d\n", ret); goto clean_up; @@ -815,6 +830,19 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw) goto clean_up; } + /* + * The starting device has been given the rproc->cached_table as the + * resource table. The address of the vring along with the other + * allocated resources (carveouts etc) is stored in cached_table. + * In order to pass this information to the remote device we must + * copy this information to device memory. + */ + loaded_table = rproc_find_loaded_rsc_table(rproc, fw); + if (!loaded_table) + goto clean_up; + + memcpy(loaded_table, rproc->cached_table, tablesz); + /* power up the remote processor */ ret = rproc->ops->start(rproc); if (ret) { @@ -822,6 +850,13 @@ static int rproc_fw_boot(struct rproc *rproc, const struct firmware *fw) goto clean_up; } + /* + * Update table_ptr so that all subsequent vring allocations and + * virtio fields manipulation update the actual loaded resource table + * in device memory. + */ + rproc->table_ptr = loaded_table; + rproc->state = RPROC_RUNNING; dev_info(dev, "remote processor %s is now up\n", rproc->name); @@ -856,16 +891,30 @@ static void rproc_fw_config_virtio(const struct firmware *fw, void *context) if (!table) goto out; + rproc->table_csum = crc32(0, table, tablesz); + + /* + * Create a copy of the resource table. When a virtio device starts + * and calls vring_new_virtqueue() the address of the allocated vring + * will be stored in the cached_table. Before the device is started, + * cached_table will be copied into devic memory. + */ + rproc->cached_table = kmalloc(tablesz, GFP_KERNEL); + if (!rproc->cached_table) + goto out; + + memcpy(rproc->cached_table, table, tablesz); + rproc->table_ptr = rproc->cached_table; + /* count the number of notify-ids */ rproc->max_notifyid = -1; - ret = rproc_handle_resources(rproc, table, tablesz, - rproc_count_vrings_handler); - - /* look for virtio devices and register them */ - ret = rproc_handle_resources(rproc, table, tablesz, rproc_vdev_handler); + ret = rproc_handle_resources(rproc, tablesz, rproc_count_vrings_handler); if (ret) goto out; + /* look for virtio devices and register them */ + ret = rproc_handle_resources(rproc, tablesz, rproc_vdev_handler); + out: release_firmware(fw); /* allow rproc_del() contexts, if any, to proceed */ @@ -923,6 +972,9 @@ int rproc_trigger_recovery(struct rproc *rproc) /* wait until there is no more rproc users */ wait_for_completion(&rproc->crash_comp); + /* Free the copy of the resource table */ + kfree(rproc->cached_table); + return rproc_add_virtio_devices(rproc); } @@ -1078,6 +1130,9 @@ void rproc_shutdown(struct rproc *rproc) rproc_disable_iommu(rproc); + /* Give the next start a clean resource table */ + rproc->table_ptr = rproc->cached_table; + /* if in crash state, unlock crash handler */ if (rproc->state == RPROC_CRASHED) complete_all(&rproc->crash_comp); @@ -1288,6 +1343,9 @@ int rproc_del(struct rproc *rproc) list_for_each_entry_safe(rvdev, tmp, &rproc->rvdevs, node) rproc_remove_virtio_dev(rvdev); + /* Free the copy of the resource table */ + kfree(rproc->cached_table); + device_del(&rproc->dev); return 0; |