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-rw-r--r--legacy-driver-guest/bar/gsp_bar.c242
1 files changed, 242 insertions, 0 deletions
diff --git a/legacy-driver-guest/bar/gsp_bar.c b/legacy-driver-guest/bar/gsp_bar.c
new file mode 100644
index 0000000..aa3ed62
--- /dev/null
+++ b/legacy-driver-guest/bar/gsp_bar.c
@@ -0,0 +1,242 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * GSP vGPU-IO Driver - BAR Emulation
+ */
+
+#include "gsp_core.h"
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+/* BAR Emulation Ops */
+static int gsp_bar_trap_handler(struct gsp_vf *vf, struct gsp_bar_trap_payload *trap)
+{
+ struct gsp_bar_state *bar = &vf->bar_state;
+ struct gsp_bar_trap_response resp = {0};
+ size_t resp_size = sizeof(resp);
+ int ret;
+
+ /* Validate BAR index (we only support BAR1) */
+ if (trap->bar_index != 1)
+ return -EINVAL;
+
+ /* Validate offset */
+ if (trap->offset >= bar->aperture_size)
+ return -ERANGE;
+
+ /* Check ForceBarAccess */
+ if (bar->force_access && vf->id != bar->force_vf)
+ return -EPERM;
+
+ /* In emulation mode, handle locally */
+ if (emulation_mode) {
+ /* Simulate BAR trap handling */
+ if (trap->trap_type == GSP_BAR_WRITE) {
+ /* Config write - update aperture */
+ bar->aperture_offset = trap->offset;
+ bar->aperture_size = trap->value;
+ } else if (trap->trap_type == GSP_BAR_ATOMIC) {
+ /* Force access control */
+ bar->force_access = trap->offset ? true : false;
+ bar->force_vf = trap->offset ? vf->id : 0;
+ }
+ resp.value = 0;
+ return 0;
+ }
+
+ /* Forward to GSP BAR trap handler (0x04CB8188) */
+ ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_BAR_TRAP,
+ trap, sizeof(*trap), &resp, &resp_size);
+
+ return ret;
+}
+
+/* Aperture Configuration */
+static int gsp_bar_config_aperture(struct gsp_vf *vf, uint64_t offset, uint64_t size)
+{
+ struct gsp_bar_state *bar = &vf->bar_state;
+ struct gsp_bar_trap_payload payload = {0};
+ struct gsp_bar_trap_response resp = {0};
+ size_t resp_size = sizeof(resp);
+ int ret;
+
+ /* Validate alignment (4KB) */
+ if (offset & 0xFFF || size & 0xFFF)
+ return -EINVAL;
+
+ /* Validate max size (256KB per firmware) */
+ if (size > 0x40000)
+ return -EINVAL;
+
+ /* In emulation mode, handle locally */
+ if (emulation_mode) {
+ bar->aperture_offset = offset;
+ bar->aperture_size = size;
+ return 0;
+ }
+
+ payload.bar_index = 1;
+ payload.trap_type = GSP_BAR_WRITE; /* Config write */
+ payload.offset = offset;
+ payload.value = size;
+ payload.size = 8;
+ payload.vf_id = vf->id;
+
+ ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_BAR_TRAP,
+ &payload, sizeof(payload), &resp, &resp_size);
+ if (!ret) {
+ bar->aperture_offset = offset;
+ bar->aperture_size = size;
+ }
+
+ return ret;
+}
+
+/* ForceBarAccess Control */
+int gsp_bar_force_access(struct gsp_vf *vf, bool enable)
+{
+ struct gsp_bar_state *bar = &vf->bar_state;
+ struct gsp_bar_trap_payload payload = {0};
+ struct gsp_bar_trap_response resp = {0};
+ size_t resp_size = sizeof(resp);
+ int ret;
+
+ /* In emulation mode, handle locally */
+ if (emulation_mode) {
+ bar->force_access = enable;
+ bar->force_vf = enable ? vf->id : 0;
+ return 0;
+ }
+
+ payload.bar_index = 1;
+ payload.trap_type = GSP_BAR_ATOMIC; /* Force access control */
+ payload.offset = enable ? 1 : 0;
+ payload.value = enable ? vf->id : 0;
+ payload.size = 8;
+ payload.vf_id = vf->id;
+
+ ret = gsp_rpc_send_sync(vf->gsp->rpc, GSP_RPC_BAR_TRAP,
+ &payload, sizeof(payload), &resp, &resp_size);
+ if (!ret) {
+ bar->force_access = enable;
+ bar->force_vf = enable ? vf->id : 0;
+ }
+
+ return ret;
+}
+
+/* State Save for Migration */
+static int gsp_bar_save_state(struct gsp_vf *vf, void *buf, size_t *size)
+{
+ struct gsp_bar_state *bar = &vf->bar_state;
+ size_t needed = sizeof(*bar) + bar->backing_size;
+
+ if (!buf || *size < needed)
+ return -ENOSPC;
+
+ memcpy(buf, bar, sizeof(*bar));
+ if (bar->backing_store && bar->backing_size > 0)
+ memcpy(buf + sizeof(*bar), bar->backing_store, bar->backing_size);
+
+ *size = needed;
+ return 0;
+}
+
+/* State Restore for Migration */
+static int gsp_bar_restore_state(struct gsp_vf *vf, void *buf, size_t size)
+{
+ struct gsp_bar_state *bar = &vf->bar_state;
+ size_t min_size = sizeof(*bar);
+
+ if (!buf || size < min_size)
+ return -EINVAL;
+
+ memcpy(bar, buf, sizeof(*bar));
+
+ if (size > min_size && bar->backing_size > 0) {
+ if (!bar->backing_store) {
+ bar->backing_store = vzalloc(bar->backing_size);
+ if (!bar->backing_store)
+ return -ENOMEM;
+ }
+ memcpy(bar->backing_store, buf + min_size,
+ min(size - min_size, bar->backing_size));
+ }
+
+ /* Reconfigure BAR in GSP */
+ return gsp_bar_config_aperture(vf, bar->aperture_offset, bar->aperture_size);
+}
+
+/* VF BAR Initialization */
+int gsp_vf_bar_init(struct gsp_vf *vf)
+{
+ struct gsp_bar_state *bar = &vf->bar_state;
+ int ret;
+
+ /* Initialize with config values */
+ bar->aperture_offset = vf->bar1_offset;
+ bar->aperture_size = vf->bar1_size;
+ bar->force_access = false;
+ bar->force_vf = 0;
+ bar->backing_store = NULL;
+ bar->backing_size = 0;
+
+ /* Allocate backing store (max 256KB) */
+ if (bar->aperture_size > 0) {
+ bar->backing_size = min(bar->aperture_size, (uint64_t)0x40000);
+ bar->backing_store = vzalloc(bar->backing_size);
+ if (!bar->backing_store)
+ return -ENOMEM;
+ }
+
+ /* Configure aperture in GSP (skip in emulation mode) */
+ if (!emulation_mode) {
+ ret = gsp_bar_config_aperture(vf, bar->aperture_offset, bar->aperture_size);
+ if (ret) {
+ dev_err(vf->gsp->dev, "VF %u: BAR aperture config failed: %d\n", vf->id, ret);
+ goto err_backing;
+ }
+ } else {
+ dev_info(vf->gsp->dev, "VF %u: BAR1 initialized in emulation mode [0x%llx, 0x%llx)\n",
+ vf->id, bar->aperture_offset, bar->aperture_offset + bar->aperture_size);
+ }
+
+ dev_info(vf->gsp->dev, "VF %u: BAR1 initialized [0x%llx, 0x%llx)\n",
+ vf->id, bar->aperture_offset, bar->aperture_offset + bar->aperture_size);
+
+ return 0;
+
+err_backing:
+ vfree(bar->backing_store);
+ bar->backing_store = NULL;
+ bar->backing_size = 0;
+ return ret;
+}
+
+/* VF BAR Cleanup */
+void gsp_vf_bar_fini(struct gsp_vf *vf)
+{
+ struct gsp_bar_state *bar = &vf->bar_state;
+
+ vfree(bar->backing_store);
+ bar->backing_store = NULL;
+ bar->backing_size = 0;
+
+ dev_info(vf->gsp->dev, "VF %u: BAR1 cleaned up\n", vf->id);
+}
+
+/* BAR Trap Entry Point (called from ISR/notification) */
+int gsp_vf_bar_trap(struct gsp_vf *vf, struct gsp_bar_trap_payload *trap)
+{
+ return gsp_bar_trap_handler(vf, trap);
+}
+
+/* Migration Interface */
+int gsp_migration_bar_save(struct gsp_vf *vf, void *buf, size_t *size)
+{
+ return gsp_bar_save_state(vf, buf, size);
+}
+
+int gsp_migration_bar_restore(struct gsp_vf *vf, void *buf, size_t size)
+{
+ return gsp_bar_restore_state(vf, buf, size);
+} \ No newline at end of file
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