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-rw-r--r--drivers/misc/cxl/flash.c543
1 files changed, 543 insertions, 0 deletions
diff --git a/drivers/misc/cxl/flash.c b/drivers/misc/cxl/flash.c
new file mode 100644
index 000000000..43917898f
--- /dev/null
+++ b/drivers/misc/cxl/flash.c
@@ -0,0 +1,543 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/semaphore.h>
+#include <linux/slab.h>
+#include <linux/uaccess.h>
+#include <asm/rtas.h>
+
+#include "cxl.h"
+#include "hcalls.h"
+
+#define DOWNLOAD_IMAGE 1
+#define VALIDATE_IMAGE 2
+
+struct ai_header {
+ u16 version;
+ u8 reserved0[6];
+ u16 vendor;
+ u16 device;
+ u16 subsystem_vendor;
+ u16 subsystem;
+ u64 image_offset;
+ u64 image_length;
+ u8 reserved1[96];
+};
+
+static struct semaphore sem;
+static unsigned long *buffer[CXL_AI_MAX_ENTRIES];
+static struct sg_list *le;
+static u64 continue_token;
+static unsigned int transfer;
+
+struct update_props_workarea {
+ __be32 phandle;
+ __be32 state;
+ __be64 reserved;
+ __be32 nprops;
+} __packed;
+
+struct update_nodes_workarea {
+ __be32 state;
+ __be64 unit_address;
+ __be32 reserved;
+} __packed;
+
+#define DEVICE_SCOPE 3
+#define NODE_ACTION_MASK 0xff000000
+#define NODE_COUNT_MASK 0x00ffffff
+#define OPCODE_DELETE 0x01000000
+#define OPCODE_UPDATE 0x02000000
+#define OPCODE_ADD 0x03000000
+
+static int rcall(int token, char *buf, s32 scope)
+{
+ int rc;
+
+ spin_lock(&rtas_data_buf_lock);
+
+ memcpy(rtas_data_buf, buf, RTAS_DATA_BUF_SIZE);
+ rc = rtas_call(token, 2, 1, NULL, rtas_data_buf, scope);
+ memcpy(buf, rtas_data_buf, RTAS_DATA_BUF_SIZE);
+
+ spin_unlock(&rtas_data_buf_lock);
+ return rc;
+}
+
+static int update_property(struct device_node *dn, const char *name,
+ u32 vd, char *value)
+{
+ struct property *new_prop;
+ u32 *val;
+ int rc;
+
+ new_prop = kzalloc(sizeof(*new_prop), GFP_KERNEL);
+ if (!new_prop)
+ return -ENOMEM;
+
+ new_prop->name = kstrdup(name, GFP_KERNEL);
+ if (!new_prop->name) {
+ kfree(new_prop);
+ return -ENOMEM;
+ }
+
+ new_prop->length = vd;
+ new_prop->value = kzalloc(new_prop->length, GFP_KERNEL);
+ if (!new_prop->value) {
+ kfree(new_prop->name);
+ kfree(new_prop);
+ return -ENOMEM;
+ }
+ memcpy(new_prop->value, value, vd);
+
+ val = (u32 *)new_prop->value;
+ rc = cxl_update_properties(dn, new_prop);
+ pr_devel("%s: update property (%s, length: %i, value: %#x)\n",
+ dn->name, name, vd, be32_to_cpu(*val));
+
+ if (rc) {
+ kfree(new_prop->name);
+ kfree(new_prop->value);
+ kfree(new_prop);
+ }
+ return rc;
+}
+
+static int update_node(__be32 phandle, s32 scope)
+{
+ struct update_props_workarea *upwa;
+ struct device_node *dn;
+ int i, rc, ret;
+ char *prop_data;
+ char *buf;
+ int token;
+ u32 nprops;
+ u32 vd;
+
+ token = rtas_token("ibm,update-properties");
+ if (token == RTAS_UNKNOWN_SERVICE)
+ return -EINVAL;
+
+ buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ dn = of_find_node_by_phandle(be32_to_cpu(phandle));
+ if (!dn) {
+ kfree(buf);
+ return -ENOENT;
+ }
+
+ upwa = (struct update_props_workarea *)&buf[0];
+ upwa->phandle = phandle;
+ do {
+ rc = rcall(token, buf, scope);
+ if (rc < 0)
+ break;
+
+ prop_data = buf + sizeof(*upwa);
+ nprops = be32_to_cpu(upwa->nprops);
+
+ if (*prop_data == 0) {
+ prop_data++;
+ vd = be32_to_cpu(*(__be32 *)prop_data);
+ prop_data += vd + sizeof(vd);
+ nprops--;
+ }
+
+ for (i = 0; i < nprops; i++) {
+ char *prop_name;
+
+ prop_name = prop_data;
+ prop_data += strlen(prop_name) + 1;
+ vd = be32_to_cpu(*(__be32 *)prop_data);
+ prop_data += sizeof(vd);
+
+ if ((vd != 0x00000000) && (vd != 0x80000000)) {
+ ret = update_property(dn, prop_name, vd,
+ prop_data);
+ if (ret)
+ pr_err("cxl: Could not update property %s - %i\n",
+ prop_name, ret);
+
+ prop_data += vd;
+ }
+ }
+ } while (rc == 1);
+
+ of_node_put(dn);
+ kfree(buf);
+ return rc;
+}
+
+static int update_devicetree(struct cxl *adapter, s32 scope)
+{
+ struct update_nodes_workarea *unwa;
+ u32 action, node_count;
+ int token, rc, i;
+ __be32 *data, drc_index, phandle;
+ char *buf;
+
+ token = rtas_token("ibm,update-nodes");
+ if (token == RTAS_UNKNOWN_SERVICE)
+ return -EINVAL;
+
+ buf = kzalloc(RTAS_DATA_BUF_SIZE, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ unwa = (struct update_nodes_workarea *)&buf[0];
+ unwa->unit_address = cpu_to_be64(adapter->guest->handle);
+ do {
+ rc = rcall(token, buf, scope);
+ if (rc && rc != 1)
+ break;
+
+ data = (__be32 *)buf + 4;
+ while (be32_to_cpu(*data) & NODE_ACTION_MASK) {
+ action = be32_to_cpu(*data) & NODE_ACTION_MASK;
+ node_count = be32_to_cpu(*data) & NODE_COUNT_MASK;
+ pr_devel("device reconfiguration - action: %#x, nodes: %#x\n",
+ action, node_count);
+ data++;
+
+ for (i = 0; i < node_count; i++) {
+ phandle = *data++;
+
+ switch (action) {
+ case OPCODE_DELETE:
+ /* nothing to do */
+ break;
+ case OPCODE_UPDATE:
+ update_node(phandle, scope);
+ break;
+ case OPCODE_ADD:
+ /* nothing to do, just move pointer */
+ drc_index = *data++;
+ break;
+ }
+ }
+ }
+ } while (rc == 1);
+
+ kfree(buf);
+ return 0;
+}
+
+static int handle_image(struct cxl *adapter, int operation,
+ long (*fct)(u64, u64, u64, u64 *),
+ struct cxl_adapter_image *ai)
+{
+ size_t mod, s_copy, len_chunk = 0;
+ struct ai_header *header = NULL;
+ unsigned int entries = 0, i;
+ void *dest, *from;
+ int rc = 0, need_header;
+
+ /* base adapter image header */
+ need_header = (ai->flags & CXL_AI_NEED_HEADER);
+ if (need_header) {
+ header = kzalloc(sizeof(struct ai_header), GFP_KERNEL);
+ if (!header)
+ return -ENOMEM;
+ header->version = cpu_to_be16(1);
+ header->vendor = cpu_to_be16(adapter->guest->vendor);
+ header->device = cpu_to_be16(adapter->guest->device);
+ header->subsystem_vendor = cpu_to_be16(adapter->guest->subsystem_vendor);
+ header->subsystem = cpu_to_be16(adapter->guest->subsystem);
+ header->image_offset = cpu_to_be64(CXL_AI_HEADER_SIZE);
+ header->image_length = cpu_to_be64(ai->len_image);
+ }
+
+ /* number of entries in the list */
+ len_chunk = ai->len_data;
+ if (need_header)
+ len_chunk += CXL_AI_HEADER_SIZE;
+
+ entries = len_chunk / CXL_AI_BUFFER_SIZE;
+ mod = len_chunk % CXL_AI_BUFFER_SIZE;
+ if (mod)
+ entries++;
+
+ if (entries > CXL_AI_MAX_ENTRIES) {
+ rc = -EINVAL;
+ goto err;
+ }
+
+ /* < -- MAX_CHUNK_SIZE = 4096 * 256 = 1048576 bytes -->
+ * chunk 0 ----------------------------------------------------
+ * | header | data |
+ * ----------------------------------------------------
+ * chunk 1 ----------------------------------------------------
+ * | data |
+ * ----------------------------------------------------
+ * ....
+ * chunk n ----------------------------------------------------
+ * | data |
+ * ----------------------------------------------------
+ */
+ from = (void *) ai->data;
+ for (i = 0; i < entries; i++) {
+ dest = buffer[i];
+ s_copy = CXL_AI_BUFFER_SIZE;
+
+ if ((need_header) && (i == 0)) {
+ /* add adapter image header */
+ memcpy(buffer[i], header, sizeof(struct ai_header));
+ s_copy = CXL_AI_BUFFER_SIZE - CXL_AI_HEADER_SIZE;
+ dest += CXL_AI_HEADER_SIZE; /* image offset */
+ }
+ if ((i == (entries - 1)) && mod)
+ s_copy = mod;
+
+ /* copy data */
+ if (copy_from_user(dest, from, s_copy))
+ goto err;
+
+ /* fill in the list */
+ le[i].phys_addr = cpu_to_be64(virt_to_phys(buffer[i]));
+ le[i].len = cpu_to_be64(CXL_AI_BUFFER_SIZE);
+ if ((i == (entries - 1)) && mod)
+ le[i].len = cpu_to_be64(mod);
+ from += s_copy;
+ }
+ pr_devel("%s (op: %i, need header: %i, entries: %i, token: %#llx)\n",
+ __func__, operation, need_header, entries, continue_token);
+
+ /*
+ * download/validate the adapter image to the coherent
+ * platform facility
+ */
+ rc = fct(adapter->guest->handle, virt_to_phys(le), entries,
+ &continue_token);
+ if (rc == 0) /* success of download/validation operation */
+ continue_token = 0;
+
+err:
+ kfree(header);
+
+ return rc;
+}
+
+static int transfer_image(struct cxl *adapter, int operation,
+ struct cxl_adapter_image *ai)
+{
+ int rc = 0;
+ int afu;
+
+ switch (operation) {
+ case DOWNLOAD_IMAGE:
+ rc = handle_image(adapter, operation,
+ &cxl_h_download_adapter_image, ai);
+ if (rc < 0) {
+ pr_devel("resetting adapter\n");
+ cxl_h_reset_adapter(adapter->guest->handle);
+ }
+ return rc;
+
+ case VALIDATE_IMAGE:
+ rc = handle_image(adapter, operation,
+ &cxl_h_validate_adapter_image, ai);
+ if (rc < 0) {
+ pr_devel("resetting adapter\n");
+ cxl_h_reset_adapter(adapter->guest->handle);
+ return rc;
+ }
+ if (rc == 0) {
+ pr_devel("remove current afu\n");
+ for (afu = 0; afu < adapter->slices; afu++)
+ cxl_guest_remove_afu(adapter->afu[afu]);
+
+ pr_devel("resetting adapter\n");
+ cxl_h_reset_adapter(adapter->guest->handle);
+
+ /* The entire image has now been
+ * downloaded and the validation has
+ * been successfully performed.
+ * After that, the partition should call
+ * ibm,update-nodes and
+ * ibm,update-properties to receive the
+ * current configuration
+ */
+ rc = update_devicetree(adapter, DEVICE_SCOPE);
+ transfer = 1;
+ }
+ return rc;
+ }
+
+ return -EINVAL;
+}
+
+static long ioctl_transfer_image(struct cxl *adapter, int operation,
+ struct cxl_adapter_image __user *uai)
+{
+ struct cxl_adapter_image ai;
+
+ pr_devel("%s\n", __func__);
+
+ if (copy_from_user(&ai, uai, sizeof(struct cxl_adapter_image)))
+ return -EFAULT;
+
+ /*
+ * Make sure reserved fields and bits are set to 0
+ */
+ if (ai.reserved1 || ai.reserved2 || ai.reserved3 || ai.reserved4 ||
+ (ai.flags & ~CXL_AI_ALL))
+ return -EINVAL;
+
+ return transfer_image(adapter, operation, &ai);
+}
+
+static int device_open(struct inode *inode, struct file *file)
+{
+ int adapter_num = CXL_DEVT_ADAPTER(inode->i_rdev);
+ struct cxl *adapter;
+ int rc = 0, i;
+
+ pr_devel("in %s\n", __func__);
+
+ BUG_ON(sizeof(struct ai_header) != CXL_AI_HEADER_SIZE);
+
+ /* Allows one process to open the device by using a semaphore */
+ if (down_interruptible(&sem) != 0)
+ return -EPERM;
+
+ if (!(adapter = get_cxl_adapter(adapter_num))) {
+ rc = -ENODEV;
+ goto err_unlock;
+ }
+
+ file->private_data = adapter;
+ continue_token = 0;
+ transfer = 0;
+
+ for (i = 0; i < CXL_AI_MAX_ENTRIES; i++)
+ buffer[i] = NULL;
+
+ /* aligned buffer containing list entries which describes up to
+ * 1 megabyte of data (256 entries of 4096 bytes each)
+ * Logical real address of buffer 0 - Buffer 0 length in bytes
+ * Logical real address of buffer 1 - Buffer 1 length in bytes
+ * Logical real address of buffer 2 - Buffer 2 length in bytes
+ * ....
+ * ....
+ * Logical real address of buffer N - Buffer N length in bytes
+ */
+ le = (struct sg_list *)get_zeroed_page(GFP_KERNEL);
+ if (!le) {
+ rc = -ENOMEM;
+ goto err;
+ }
+
+ for (i = 0; i < CXL_AI_MAX_ENTRIES; i++) {
+ buffer[i] = (unsigned long *)get_zeroed_page(GFP_KERNEL);
+ if (!buffer[i]) {
+ rc = -ENOMEM;
+ goto err1;
+ }
+ }
+
+ return 0;
+
+err1:
+ for (i = 0; i < CXL_AI_MAX_ENTRIES; i++) {
+ if (buffer[i])
+ free_page((unsigned long) buffer[i]);
+ }
+
+ if (le)
+ free_page((unsigned long) le);
+err:
+ put_device(&adapter->dev);
+err_unlock:
+ up(&sem);
+
+ return rc;
+}
+
+static long device_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct cxl *adapter = file->private_data;
+
+ pr_devel("in %s\n", __func__);
+
+ if (cmd == CXL_IOCTL_DOWNLOAD_IMAGE)
+ return ioctl_transfer_image(adapter,
+ DOWNLOAD_IMAGE,
+ (struct cxl_adapter_image __user *)arg);
+ else if (cmd == CXL_IOCTL_VALIDATE_IMAGE)
+ return ioctl_transfer_image(adapter,
+ VALIDATE_IMAGE,
+ (struct cxl_adapter_image __user *)arg);
+ else
+ return -EINVAL;
+}
+
+static long device_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ return device_ioctl(file, cmd, arg);
+}
+
+static int device_close(struct inode *inode, struct file *file)
+{
+ struct cxl *adapter = file->private_data;
+ int i;
+
+ pr_devel("in %s\n", __func__);
+
+ for (i = 0; i < CXL_AI_MAX_ENTRIES; i++) {
+ if (buffer[i])
+ free_page((unsigned long) buffer[i]);
+ }
+
+ if (le)
+ free_page((unsigned long) le);
+
+ up(&sem);
+ put_device(&adapter->dev);
+ continue_token = 0;
+
+ /* reload the module */
+ if (transfer)
+ cxl_guest_reload_module(adapter);
+ else {
+ pr_devel("resetting adapter\n");
+ cxl_h_reset_adapter(adapter->guest->handle);
+ }
+
+ transfer = 0;
+ return 0;
+}
+
+static const struct file_operations fops = {
+ .owner = THIS_MODULE,
+ .open = device_open,
+ .unlocked_ioctl = device_ioctl,
+ .compat_ioctl = device_compat_ioctl,
+ .release = device_close,
+};
+
+void cxl_guest_remove_chardev(struct cxl *adapter)
+{
+ cdev_del(&adapter->guest->cdev);
+}
+
+int cxl_guest_add_chardev(struct cxl *adapter)
+{
+ dev_t devt;
+ int rc;
+
+ devt = MKDEV(MAJOR(cxl_get_dev()), CXL_CARD_MINOR(adapter));
+ cdev_init(&adapter->guest->cdev, &fops);
+ if ((rc = cdev_add(&adapter->guest->cdev, devt, 1))) {
+ dev_err(&adapter->dev,
+ "Unable to add chardev on adapter (card%i): %i\n",
+ adapter->adapter_num, rc);
+ goto err;
+ }
+ adapter->dev.devt = devt;
+ sema_init(&sem, 1);
+err:
+ return rc;
+}
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