drivers/virt/gunyah/rsc_mgr_rpc.c | 227 ++++++++++++++++++++++++++++++
include/linux/gunyah_rsc_mgr.h | 48 +++++++
2 files changed, 275 insertions(+)
diff --git a/drivers/virt/gunyah/rsc_mgr_rpc.c b/drivers/virt/gunyah/rsc_mgr_rpc.c
index a4a9f0ba4e1f..4f25f07400b3 100644
--- a/drivers/virt/gunyah/rsc_mgr_rpc.c
+++ b/drivers/virt/gunyah/rsc_mgr_rpc.c
@@ -6,6 +6,12 @@
#include <linux/gunyah_rsc_mgr.h>
#include "rsc_mgr.h"
+/* Message IDs: Memory Management */
+#define GH_RM_RPC_MEM_LEND 0x51000012
+#define GH_RM_RPC_MEM_SHARE 0x51000013
+#define GH_RM_RPC_MEM_RECLAIM 0x51000015
+#define GH_RM_RPC_MEM_APPEND 0x51000018
+
/* Message IDs: VM Management */
#define GH_RM_RPC_VM_ALLOC_VMID 0x56000001
#define GH_RM_RPC_VM_DEALLOC_VMID 0x56000002
@@ -22,6 +28,46 @@ struct gh_rm_vm_common_vmid_req {
__le16 _padding;
} __packed;
+/* Call: MEM_LEND, MEM_SHARE */
+#define GH_MEM_SHARE_REQ_FLAGS_APPEND BIT(1)
+
+struct gh_rm_mem_share_req_header {
+ u8 mem_type;
+ u8 _padding0;
+ u8 flags;
+ u8 _padding1;
+ __le32 label;
+} __packed;
+
+struct gh_rm_mem_share_req_acl_section {
+ __le32 n_entries;
+ struct gh_rm_mem_acl_entry entries[];
+};
+
+struct gh_rm_mem_share_req_mem_section {
+ __le16 n_entries;
+ __le16 _padding;
+ struct gh_rm_mem_entry entries[];
+};
+
+/* Call: MEM_RELEASE */
+struct gh_rm_mem_release_req {
+ __le32 mem_handle;
+ u8 flags; /* currently not used */
+ u8 _padding0;
+ __le16 _padding1;
+} __packed;
+
+/* Call: MEM_APPEND */
+#define GH_MEM_APPEND_REQ_FLAGS_END BIT(0)
+
+struct gh_rm_mem_append_req_header {
+ __le32 mem_handle;
+ u8 flags;
+ u8 _padding0;
+ __le16 _padding1;
+} __packed;
+
/* Call: VM_ALLOC */
struct gh_rm_vm_alloc_vmid_resp {
__le16 vmid;
@@ -51,6 +97,8 @@ struct gh_rm_vm_config_image_req {
__le64 dtb_size;
} __packed;
+#define GH_RM_MAX_MEM_ENTRIES 512
+
/*
* Several RM calls take only a VMID as a parameter and give only standard
* response back. Deduplicate boilerplate code by using this common call.
@@ -64,6 +112,185 @@ static int gh_rm_common_vmid_call(struct gh_rm *rm, u32 message_id, u16 vmid)
return gh_rm_call(rm, message_id, &req_payload, sizeof(req_payload), NULL, NULL);
}
+static int _gh_rm_mem_append(struct gh_rm *rm, u32 mem_handle, bool end_append,
+ struct gh_rm_mem_entry *mem_entries, size_t n_mem_entries)
+{
+ struct gh_rm_mem_share_req_mem_section *mem_section;
+ struct gh_rm_mem_append_req_header *req_header;
+ size_t msg_size = 0;
+ void *msg;
+ int ret;
+
+ msg_size += sizeof(struct gh_rm_mem_append_req_header);
+ msg_size += struct_size(mem_section, entries, n_mem_entries);
+
+ msg = kzalloc(msg_size, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ req_header = msg;
+ mem_section = (void *)req_header + sizeof(struct gh_rm_mem_append_req_header);
+
+ req_header->mem_handle = cpu_to_le32(mem_handle);
+ if (end_append)
+ req_header->flags |= GH_MEM_APPEND_REQ_FLAGS_END;
+
+ mem_section->n_entries = cpu_to_le16(n_mem_entries);
+ memcpy(mem_section->entries, mem_entries, sizeof(*mem_entries) * n_mem_entries);
+
+ ret = gh_rm_call(rm, GH_RM_RPC_MEM_APPEND, msg, msg_size, NULL, NULL);
+ kfree(msg);
+
+ return ret;
+}
+
+static int gh_rm_mem_append(struct gh_rm *rm, u32 mem_handle,
+ struct gh_rm_mem_entry *mem_entries, size_t n_mem_entries)
+{
+ bool end_append;
+ int ret = 0;
+ size_t n;
+
+ while (n_mem_entries) {
+ if (n_mem_entries > GH_RM_MAX_MEM_ENTRIES) {
+ end_append = false;
+ n = GH_RM_MAX_MEM_ENTRIES;
+ } else {
+ end_append = true;
+ n = n_mem_entries;
+ }
+
+ ret = _gh_rm_mem_append(rm, mem_handle, end_append, mem_entries, n);
+ if (ret)
+ break;
+
+ mem_entries += n;
+ n_mem_entries -= n;
+ }
+
+ return ret;
+}
+
+static int gh_rm_mem_lend_common(struct gh_rm *rm, u32 message_id, struct gh_rm_mem_parcel *p)
+{
+ size_t msg_size = 0, initial_mem_entries = p->n_mem_entries, resp_size;
+ size_t acl_section_size, mem_section_size;
+ struct gh_rm_mem_share_req_acl_section *acl_section;
+ struct gh_rm_mem_share_req_mem_section *mem_section;
+ struct gh_rm_mem_share_req_header *req_header;
+ u32 *attr_section;
+ __le32 *resp;
+ void *msg;
+ int ret;
+
+ if (!p->acl_entries || !p->n_acl_entries || !p->mem_entries || !p->n_mem_entries ||
+ p->n_acl_entries > U8_MAX || p->mem_handle != GH_MEM_HANDLE_INVAL)
+ return -EINVAL;
+
+ if (initial_mem_entries > GH_RM_MAX_MEM_ENTRIES)
+ initial_mem_entries = GH_RM_MAX_MEM_ENTRIES;
+
+ acl_section_size = struct_size(acl_section, entries, p->n_acl_entries);
+ mem_section_size = struct_size(mem_section, entries, initial_mem_entries);
+ /* The format of the message goes:
+ * request header
+ * ACL entries (which VMs get what kind of access to this memory parcel)
+ * Memory entries (list of memory regions to share)
+ * Memory attributes (currently unused, we'll hard-code the size to 0)
+ */
+ msg_size += sizeof(struct gh_rm_mem_share_req_header);
+ msg_size += acl_section_size;
+ msg_size += mem_section_size;
+ msg_size += sizeof(u32); /* for memory attributes, currently unused */
+
+ msg = kzalloc(msg_size, GFP_KERNEL);
+ if (!msg)
+ return -ENOMEM;
+
+ req_header = msg;
+ acl_section = (void *)req_header + sizeof(*req_header);
+ mem_section = (void *)acl_section + acl_section_size;
+ attr_section = (void *)mem_section + mem_section_size;
+
+ req_header->mem_type = p->mem_type;
+ if (initial_mem_entries != p->n_mem_entries)
+ req_header->flags |= GH_MEM_SHARE_REQ_FLAGS_APPEND;
+ req_header->label = cpu_to_le32(p->label);
+
+ acl_section->n_entries = cpu_to_le32(p->n_acl_entries);
+ memcpy(acl_section->entries, p->acl_entries,
+ flex_array_size(acl_section, entries, p->n_acl_entries));
+
+ mem_section->n_entries = cpu_to_le16(initial_mem_entries);
+ memcpy(mem_section->entries, p->mem_entries,
+ flex_array_size(mem_section, entries, initial_mem_entries));
+
+ /* Set n_entries for memory attribute section to 0 */
+ *attr_section = 0;
+
+ ret = gh_rm_call(rm, message_id, msg, msg_size, (void **)&resp, &resp_size);
+ kfree(msg);
+
+ if (ret)
+ return ret;
+
+ p->mem_handle = le32_to_cpu(*resp);
+ kfree(resp);
+
+ if (initial_mem_entries != p->n_mem_entries) {
+ ret = gh_rm_mem_append(rm, p->mem_handle,
+ &p->mem_entries[initial_mem_entries],
+ p->n_mem_entries - initial_mem_entries);
+ if (ret) {
+ gh_rm_mem_reclaim(rm, p);
+ p->mem_handle = GH_MEM_HANDLE_INVAL;
+ }
+ }
+
+ return ret;
+}
+
+/**
+ * gh_rm_mem_lend() - Lend memory to other virtual machines.
+ * @rm: Handle to a Gunyah resource manager
+ * @parcel: Information about the memory to be lent.
+ *
+ * Lending removes Linux's access to the memory while the memory parcel is lent.
+ */
+int gh_rm_mem_lend(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel)
+{
+ return gh_rm_mem_lend_common(rm, GH_RM_RPC_MEM_LEND, parcel);
+}
+
+
+/**
+ * gh_rm_mem_share() - Share memory with other virtual machines.
+ * @rm: Handle to a Gunyah resource manager
+ * @parcel: Information about the memory to be shared.
+ *
+ * Sharing keeps Linux's access to the memory while the memory parcel is shared.
+ */
+int gh_rm_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel)
+{
+ return gh_rm_mem_lend_common(rm, GH_RM_RPC_MEM_SHARE, parcel);
+}
+
+/**
+ * gh_rm_mem_reclaim() - Reclaim a memory parcel
+ * @rm: Handle to a Gunyah resource manager
+ * @parcel: Information about the memory to be reclaimed.
+ *
+ * RM maps the associated memory back into the stage-2 page tables of the owner VM.
+ */
+int gh_rm_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel)
+{
+ struct gh_rm_mem_release_req req = {
+ .mem_handle = cpu_to_le32(parcel->mem_handle),
+ };
+
+ return gh_rm_call(rm, GH_RM_RPC_MEM_RECLAIM, &req, sizeof(req), NULL, NULL);
+}
+
/**
* gh_rm_alloc_vmid() - Allocate a new VM in Gunyah. Returns the VM identifier.
* @rm: Handle to a Gunyah resource manager
diff --git a/include/linux/gunyah_rsc_mgr.h b/include/linux/gunyah_rsc_mgr.h
index 1ac66d9004d2..dfac088420bd 100644
--- a/include/linux/gunyah_rsc_mgr.h
+++ b/include/linux/gunyah_rsc_mgr.h
@@ -11,6 +11,7 @@
#include <linux/gunyah.h>
#define GH_VMID_INVAL U16_MAX
+#define GH_MEM_HANDLE_INVAL U32_MAX
struct gh_rm;
int gh_rm_notifier_register(struct gh_rm *rm, struct notifier_block *nb);
@@ -51,7 +52,54 @@ struct gh_rm_vm_status_payload {
#define GH_RM_NOTIFICATION_VM_STATUS 0x56100008
+#define GH_RM_ACL_X BIT(0)
+#define GH_RM_ACL_W BIT(1)
+#define GH_RM_ACL_R BIT(2)
+
+struct gh_rm_mem_acl_entry {
+ __le16 vmid;
+ u8 perms;
+ u8 reserved;
+} __packed;
+
+struct gh_rm_mem_entry {
+ __le64 phys_addr;
+ __le64 size;
+} __packed;
+
+enum gh_rm_mem_type {
+ GH_RM_MEM_TYPE_NORMAL = 0,
+ GH_RM_MEM_TYPE_IO = 1,
+};
+
+/*
+ * struct gh_rm_mem_parcel - Info about memory to be lent/shared/donated/reclaimed
+ * @mem_type: The type of memory: normal (DDR) or IO
+ * @label: An client-specified identifier which can be used by the other VMs to identify the purpose
+ * of the memory parcel.
+ * @n_acl_entries: Count of the number of entries in the @acl_entries array.
+ * @acl_entries: An array of access control entries. Each entry specifies a VM and what access
+ * is allowed for the memory parcel.
+ * @n_mem_entries: Count of the number of entries in the @mem_entries array.
+ * @mem_entries: An array of regions to be associated with the memory parcel. Addresses should be
+ * (intermediate) physical addresses from Linux's perspective.
+ * @mem_handle: On success, filled with memory handle that RM allocates for this memory parcel
+ */
+struct gh_rm_mem_parcel {
+ enum gh_rm_mem_type mem_type;
+ u32 label;
+ size_t n_acl_entries;
+ struct gh_rm_mem_acl_entry *acl_entries;
+ size_t n_mem_entries;
+ struct gh_rm_mem_entry *mem_entries;
+ u32 mem_handle;
+};
+
/* RPC Calls */
+int gh_rm_mem_lend(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel);
+int gh_rm_mem_share(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel);
+int gh_rm_mem_reclaim(struct gh_rm *rm, struct gh_rm_mem_parcel *parcel);
+
int gh_rm_alloc_vmid(struct gh_rm *rm, u16 vmid);
int gh_rm_dealloc_vmid(struct gh_rm *rm, u16 vmid);
int gh_rm_vm_reset(struct gh_rm *rm, u16 vmid);
