--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+
+// Interface to PSP for CCP/SEV-TIO/SNP-VM
+
+#include <linux/pci.h>
+#include <linux/tsm.h>
+#include <linux/psp.h>
+#include <linux/vmalloc.h>
+#include <linux/bitfield.h>
+#include <linux/pci-doe.h>
+#include <asm/sev-common.h>
+#include <asm/sev.h>
+#include <asm/page.h>
+#include "sev-dev.h"
+#include "sev-dev-tio.h"
+
+#define to_tio_status(dev_data) \
+ (container_of((dev_data), struct tio_dsm, data)->sev->tio_status)
+
+#define SLA_PAGE_TYPE_DATA 0
+#define SLA_PAGE_TYPE_SCATTER 1
+#define SLA_PAGE_SIZE_4K 0
+#define SLA_PAGE_SIZE_2M 1
+#define SLA_SZ(s) ((s).page_size == SLA_PAGE_SIZE_2M ? SZ_2M : SZ_4K)
+#define SLA_SCATTER_LEN(s) (SLA_SZ(s) / sizeof(struct sla_addr_t))
+#define SLA_EOL ((struct sla_addr_t) { .pfn = ((1UL << 40) - 1) })
+#define SLA_NULL ((struct sla_addr_t) { 0 })
+#define IS_SLA_NULL(s) ((s).sla == SLA_NULL.sla)
+#define IS_SLA_EOL(s) ((s).sla == SLA_EOL.sla)
+
+static phys_addr_t sla_to_pa(struct sla_addr_t sla)
+{
+ u64 pfn = sla.pfn;
+ u64 pa = pfn << PAGE_SHIFT;
+
+ return pa;
+}
+
+static void *sla_to_va(struct sla_addr_t sla)
+{
+ void *va = __va(__sme_clr(sla_to_pa(sla)));
+
+ return va;
+}
+
+#define sla_to_pfn(sla) (__pa(sla_to_va(sla)) >> PAGE_SHIFT)
+#define sla_to_page(sla) virt_to_page(sla_to_va(sla))
+
+static struct sla_addr_t make_sla(struct page *pg, bool stp)
+{
+ u64 pa = __sme_set(page_to_phys(pg));
+ struct sla_addr_t ret = {
+ .pfn = pa >> PAGE_SHIFT,
+ .page_size = SLA_PAGE_SIZE_4K, /* Do not do SLA_PAGE_SIZE_2M ATM */
+ .page_type = stp ? SLA_PAGE_TYPE_SCATTER : SLA_PAGE_TYPE_DATA
+ };
+
+ return ret;
+}
+
+/* the BUFFER Structure */
+#define SLA_BUFFER_FLAG_ENCRYPTION BIT(0)
+
+/*
+ * struct sla_buffer_hdr - Scatter list address buffer header
+ *
+ * @capacity_sz: Total capacity of the buffer in bytes
+ * @payload_sz: Size of buffer payload in bytes, must be multiple of 32B
+ * @flags: Buffer flags (SLA_BUFFER_FLAG_ENCRYPTION: buffer is encrypted)
+ * @iv: Initialization vector used for encryption
+ * @authtag: Authentication tag for encrypted buffer
+ */
+struct sla_buffer_hdr {
+ u32 capacity_sz;
+ u32 payload_sz; /* The size of BUFFER_PAYLOAD in bytes. Must be multiple of 32B */
+ u32 flags;
+ u8 reserved1[4];
+ u8 iv[16]; /* IV used for the encryption of this buffer */
+ u8 authtag[16]; /* Authentication tag for this buffer */
+ u8 reserved2[16];
+} __packed;
+
+enum spdm_data_type_t {
+ DOBJ_DATA_TYPE_SPDM = 0x1,
+ DOBJ_DATA_TYPE_SECURE_SPDM = 0x2,
+};
+
+struct spdm_dobj_hdr_req {
+ struct spdm_dobj_hdr hdr; /* hdr.id == SPDM_DOBJ_ID_REQ */
+ u8 data_type; /* spdm_data_type_t */
+ u8 reserved2[5];
+} __packed;
+
+struct spdm_dobj_hdr_resp {
+ struct spdm_dobj_hdr hdr; /* hdr.id == SPDM_DOBJ_ID_RESP */
+ u8 data_type; /* spdm_data_type_t */
+ u8 reserved2[5];
+} __packed;
+
+/* Defined in sev-dev-tio.h so sev-dev-tsm.c can read types of blobs */
+struct spdm_dobj_hdr_cert;
+struct spdm_dobj_hdr_meas;
+struct spdm_dobj_hdr_report;
+
+/* Used in all SPDM-aware TIO commands */
+struct spdm_ctrl {
+ struct sla_addr_t req;
+ struct sla_addr_t resp;
+ struct sla_addr_t scratch;
+ struct sla_addr_t output;
+} __packed;
+
+static size_t sla_dobj_id_to_size(u8 id)
+{
+ size_t n;
+
+ BUILD_BUG_ON(sizeof(struct spdm_dobj_hdr_resp) != 0x10);
+ switch (id) {
+ case SPDM_DOBJ_ID_REQ:
+ n = sizeof(struct spdm_dobj_hdr_req);
+ break;
+ case SPDM_DOBJ_ID_RESP:
+ n = sizeof(struct spdm_dobj_hdr_resp);
+ break;
+ default:
+ WARN_ON(1);
+ n = 0;
+ break;
+ }
+
+ return n;
+}
+
+#define SPDM_DOBJ_HDR_SIZE(hdr) sla_dobj_id_to_size((hdr)->id)
+#define SPDM_DOBJ_DATA(hdr) ((u8 *)(hdr) + SPDM_DOBJ_HDR_SIZE(hdr))
+#define SPDM_DOBJ_LEN(hdr) ((hdr)->length - SPDM_DOBJ_HDR_SIZE(hdr))
+
+#define sla_to_dobj_resp_hdr(buf) ((struct spdm_dobj_hdr_resp *) \
+ sla_to_dobj_hdr_check((buf), SPDM_DOBJ_ID_RESP))
+#define sla_to_dobj_req_hdr(buf) ((struct spdm_dobj_hdr_req *) \
+ sla_to_dobj_hdr_check((buf), SPDM_DOBJ_ID_REQ))
+
+static struct spdm_dobj_hdr *sla_to_dobj_hdr(struct sla_buffer_hdr *buf)
+{
+ if (!buf)
+ return NULL;
+
+ return (struct spdm_dobj_hdr *) &buf[1];
+}
+
+static struct spdm_dobj_hdr *sla_to_dobj_hdr_check(struct sla_buffer_hdr *buf, u32 check_dobjid)
+{
+ struct spdm_dobj_hdr *hdr = sla_to_dobj_hdr(buf);
+
+ if (WARN_ON_ONCE(!hdr))
+ return NULL;
+
+ if (hdr->id != check_dobjid) {
+ pr_err("! ERROR: expected %d, found %d\n", check_dobjid, hdr->id);
+ return NULL;
+ }
+
+ return hdr;
+}
+
+static void *sla_to_data(struct sla_buffer_hdr *buf, u32 dobjid)
+{
+ struct spdm_dobj_hdr *hdr = sla_to_dobj_hdr(buf);
+
+ if (WARN_ON_ONCE(dobjid != SPDM_DOBJ_ID_REQ && dobjid != SPDM_DOBJ_ID_RESP))
+ return NULL;
+
+ if (!hdr)
+ return NULL;
+
+ return (u8 *) hdr + sla_dobj_id_to_size(dobjid);
+}
+
+/*
+ * struct sev_data_tio_status - SEV_CMD_TIO_STATUS command
+ *
+ * @length: Length of this command buffer in bytes
+ * @status_paddr: System physical address of the TIO_STATUS structure
+ */
+struct sev_data_tio_status {
+ u32 length;
+ u8 reserved[4];
+ u64 status_paddr;
+} __packed;
+
+/* TIO_INIT */
+struct sev_data_tio_init {
+ u32 length;
+ u8 reserved[12];
+} __packed;
+
+/*
+ * struct sev_data_tio_dev_create - TIO_DEV_CREATE command
+ *
+ * @length: Length in bytes of this command buffer
+ * @dev_ctx_sla: Scatter list address pointing to a buffer to be used as a device context buffer
+ * @device_id: PCIe Routing Identifier of the device to connect to
+ * @root_port_id: PCIe Routing Identifier of the root port of the device
+ * @segment_id: PCIe Segment Identifier of the device to connect to
+ */
+struct sev_data_tio_dev_create {
+ u32 length;
+ u8 reserved1[4];
+ struct sla_addr_t dev_ctx_sla;
+ u16 device_id;
+ u16 root_port_id;
+ u8 segment_id;
+ u8 reserved2[11];
+} __packed;
+
+/*
+ * struct sev_data_tio_dev_connect - TIO_DEV_CONNECT command
+ *
+ * @length: Length in bytes of this command buffer
+ * @spdm_ctrl: SPDM control structure defined in Section 5.1
+ * @dev_ctx_sla: Scatter list address of the device context buffer
+ * @tc_mask: Bitmask of the traffic classes to initialize for SEV-TIO usage.
+ * Setting the kth bit of the TC_MASK to 1 indicates that the traffic
+ * class k will be initialized
+ * @cert_slot: Slot number of the certificate requested for constructing the SPDM session
+ * @ide_stream_id: IDE stream IDs to be associated with this device.
+ * Valid only if corresponding bit in TC_MASK is set
+ */
+struct sev_data_tio_dev_connect {
+ u32 length;
+ u8 reserved1[4];
+ struct spdm_ctrl spdm_ctrl;
+ u8 reserved2[8];
+ struct sla_addr_t dev_ctx_sla;
+ u8 tc_mask;
+ u8 cert_slot;
+ u8 reserved3[6];
+ u8 ide_stream_id[8];
+ u8 reserved4[8];
+} __packed;
+
+/*
+ * struct sev_data_tio_dev_disconnect - TIO_DEV_DISCONNECT command
+ *
+ * @length: Length in bytes of this command buffer
+ * @flags: Command flags (TIO_DEV_DISCONNECT_FLAG_FORCE: force disconnect)
+ * @spdm_ctrl: SPDM control structure defined in Section 5.1
+ * @dev_ctx_sla: Scatter list address of the device context buffer
+ */
+#define TIO_DEV_DISCONNECT_FLAG_FORCE BIT(0)
+
+struct sev_data_tio_dev_disconnect {
+ u32 length;
+ u32 flags;
+ struct spdm_ctrl spdm_ctrl;
+ struct sla_addr_t dev_ctx_sla;
+} __packed;
+
+/*
+ * struct sev_data_tio_dev_meas - TIO_DEV_MEASUREMENTS command
+ *
+ * @length: Length in bytes of this command buffer
+ * @flags: Command flags (TIO_DEV_MEAS_FLAG_RAW_BITSTREAM: request raw measurements)
+ * @spdm_ctrl: SPDM control structure defined in Section 5.1
+ * @dev_ctx_sla: Scatter list address of the device context buffer
+ * @meas_nonce: Nonce for measurement freshness verification
+ */
+#define TIO_DEV_MEAS_FLAG_RAW_BITSTREAM BIT(0)
+
+struct sev_data_tio_dev_meas {
+ u32 length;
+ u32 flags;
+ struct spdm_ctrl spdm_ctrl;
+ struct sla_addr_t dev_ctx_sla;
+ u8 meas_nonce[32];
+} __packed;
+
+/*
+ * struct sev_data_tio_dev_certs - TIO_DEV_CERTIFICATES command
+ *
+ * @length: Length in bytes of this command buffer
+ * @spdm_ctrl: SPDM control structure defined in Section 5.1
+ * @dev_ctx_sla: Scatter list address of the device context buffer
+ */
+struct sev_data_tio_dev_certs {
+ u32 length;
+ u8 reserved[4];
+ struct spdm_ctrl spdm_ctrl;
+ struct sla_addr_t dev_ctx_sla;
+} __packed;
+
+/*
+ * struct sev_data_tio_dev_reclaim - TIO_DEV_RECLAIM command
+ *
+ * @length: Length in bytes of this command buffer
+ * @dev_ctx_sla: Scatter list address of the device context buffer
+ *
+ * This command reclaims resources associated with a device context.
+ */
+struct sev_data_tio_dev_reclaim {
+ u32 length;
+ u8 reserved[4];
+ struct sla_addr_t dev_ctx_sla;
+} __packed;
+
+static struct sla_buffer_hdr *sla_buffer_map(struct sla_addr_t sla)
+{
+ struct sla_buffer_hdr *buf;
+
+ BUILD_BUG_ON(sizeof(struct sla_buffer_hdr) != 0x40);
+ if (IS_SLA_NULL(sla))
+ return NULL;
+
+ if (sla.page_type == SLA_PAGE_TYPE_SCATTER) {
+ struct sla_addr_t *scatter = sla_to_va(sla);
+ unsigned int i, npages = 0;
+
+ for (i = 0; i < SLA_SCATTER_LEN(sla); ++i) {
+ if (WARN_ON_ONCE(SLA_SZ(scatter[i]) > SZ_4K))
+ return NULL;
+
+ if (WARN_ON_ONCE(scatter[i].page_type == SLA_PAGE_TYPE_SCATTER))
+ return NULL;
+
+ if (IS_SLA_EOL(scatter[i])) {
+ npages = i;
+ break;
+ }
+ }
+ if (WARN_ON_ONCE(!npages))
+ return NULL;
+
+ struct page **pp = kmalloc_array(npages, sizeof(pp[0]), GFP_KERNEL);
+
+ if (!pp)
+ return NULL;
+
+ for (i = 0; i < npages; ++i)
+ pp[i] = sla_to_page(scatter[i]);
+
+ buf = vm_map_ram(pp, npages, 0);
+ kfree(pp);
+ } else {
+ struct page *pg = sla_to_page(sla);
+
+ buf = vm_map_ram(&pg, 1, 0);
+ }
+
+ return buf;
+}
+
+static void sla_buffer_unmap(struct sla_addr_t sla, struct sla_buffer_hdr *buf)
+{
+ if (!buf)
+ return;
+
+ if (sla.page_type == SLA_PAGE_TYPE_SCATTER) {
+ struct sla_addr_t *scatter = sla_to_va(sla);
+ unsigned int i, npages = 0;
+
+ for (i = 0; i < SLA_SCATTER_LEN(sla); ++i) {
+ if (IS_SLA_EOL(scatter[i])) {
+ npages = i;
+ break;
+ }
+ }
+ if (!npages)
+ return;
+
+ vm_unmap_ram(buf, npages);
+ } else {
+ vm_unmap_ram(buf, 1);
+ }
+}
+
+static void dobj_response_init(struct sla_buffer_hdr *buf)
+{
+ struct spdm_dobj_hdr *dobj = sla_to_dobj_hdr(buf);
+
+ dobj->id = SPDM_DOBJ_ID_RESP;
+ dobj->version.major = 0x1;
+ dobj->version.minor = 0;
+ dobj->length = 0;
+ buf->payload_sz = sla_dobj_id_to_size(dobj->id) + dobj->length;
+}
+
+static void sla_free(struct sla_addr_t sla, size_t len, bool firmware_state)
+{
+ unsigned int npages = PAGE_ALIGN(len) >> PAGE_SHIFT;
+ struct sla_addr_t *scatter = NULL;
+ int ret = 0, i;
+
+ if (IS_SLA_NULL(sla))
+ return;
+
+ if (firmware_state) {
+ if (sla.page_type == SLA_PAGE_TYPE_SCATTER) {
+ scatter = sla_to_va(sla);
+
+ for (i = 0; i < npages; ++i) {
+ if (IS_SLA_EOL(scatter[i]))
+ break;
+
+ ret = snp_reclaim_pages(sla_to_pa(scatter[i]), 1, false);
+ if (ret)
+ break;
+ }
+ } else {
+ ret = snp_reclaim_pages(sla_to_pa(sla), 1, false);
+ }
+ }
+
+ if (WARN_ON(ret))
+ return;
+
+ if (scatter) {
+ for (i = 0; i < npages; ++i) {
+ if (IS_SLA_EOL(scatter[i]))
+ break;
+ free_page((unsigned long)sla_to_va(scatter[i]));
+ }
+ }
+
+ free_page((unsigned long)sla_to_va(sla));
+}
+
+static struct sla_addr_t sla_alloc(size_t len, bool firmware_state)
+{
+ unsigned long i, npages = PAGE_ALIGN(len) >> PAGE_SHIFT;
+ struct sla_addr_t *scatter = NULL;
+ struct sla_addr_t ret = SLA_NULL;
+ struct sla_buffer_hdr *buf;
+ struct page *pg;
+
+ if (npages == 0)
+ return ret;
+
+ if (WARN_ON_ONCE(npages > ((PAGE_SIZE / sizeof(struct sla_addr_t)) + 1)))
+ return ret;
+
+ BUILD_BUG_ON(PAGE_SIZE < SZ_4K);
+
+ if (npages > 1) {
+ pg = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!pg)
+ return SLA_NULL;
+
+ ret = make_sla(pg, true);
+ scatter = page_to_virt(pg);
+ for (i = 0; i < npages; ++i) {
+ pg = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!pg)
+ goto no_reclaim_exit;
+
+ scatter[i] = make_sla(pg, false);
+ }
+ scatter[i] = SLA_EOL;
+ } else {
+ pg = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!pg)
+ return SLA_NULL;
+
+ ret = make_sla(pg, false);
+ }
+
+ buf = sla_buffer_map(ret);
+ if (!buf)
+ goto no_reclaim_exit;
+
+ buf->capacity_sz = (npages << PAGE_SHIFT);
+ sla_buffer_unmap(ret, buf);
+
+ if (firmware_state) {
+ if (scatter) {
+ for (i = 0; i < npages; ++i) {
+ if (rmp_make_private(sla_to_pfn(scatter[i]), 0,
+ PG_LEVEL_4K, 0, true))
+ goto free_exit;
+ }
+ } else {
+ if (rmp_make_private(sla_to_pfn(ret), 0, PG_LEVEL_4K, 0, true))
+ goto no_reclaim_exit;
+ }
+ }
+
+ return ret;
+
+no_reclaim_exit:
+ firmware_state = false;
+free_exit:
+ sla_free(ret, len, firmware_state);
+ return SLA_NULL;
+}
+
+/* Expands a buffer, only firmware owned buffers allowed for now */
+static int sla_expand(struct sla_addr_t *sla, size_t *len)
+{
+ struct sla_buffer_hdr *oldbuf = sla_buffer_map(*sla), *newbuf;
+ struct sla_addr_t oldsla = *sla, newsla;
+ size_t oldlen = *len, newlen;
+
+ if (!oldbuf)
+ return -EFAULT;
+
+ newlen = oldbuf->capacity_sz;
+ if (oldbuf->capacity_sz == oldlen) {
+ /* This buffer does not require expansion, must be another buffer */
+ sla_buffer_unmap(oldsla, oldbuf);
+ return 1;
+ }
+
+ pr_notice("Expanding BUFFER from %ld to %ld bytes\n", oldlen, newlen);
+
+ newsla = sla_alloc(newlen, true);
+ if (IS_SLA_NULL(newsla))
+ return -ENOMEM;
+
+ newbuf = sla_buffer_map(newsla);
+ if (!newbuf) {
+ sla_free(newsla, newlen, true);
+ return -EFAULT;
+ }
+
+ memcpy(newbuf, oldbuf, oldlen);
+
+ sla_buffer_unmap(newsla, newbuf);
+ sla_free(oldsla, oldlen, true);
+ *sla = newsla;
+ *len = newlen;
+
+ return 0;
+}
+
+static int sev_tio_do_cmd(int cmd, void *data, size_t data_len, int *psp_ret,
+ struct tsm_dsm_tio *dev_data)
+{
+ int rc;
+
+ *psp_ret = 0;
+ rc = sev_do_cmd(cmd, data, psp_ret);
+
+ if (WARN_ON(!rc && *psp_ret == SEV_RET_SPDM_REQUEST))
+ return -EIO;
+
+ if (rc == 0 && *psp_ret == SEV_RET_EXPAND_BUFFER_LENGTH_REQUEST) {
+ int rc1, rc2;
+
+ rc1 = sla_expand(&dev_data->output, &dev_data->output_len);
+ if (rc1 < 0)
+ return rc1;
+
+ rc2 = sla_expand(&dev_data->scratch, &dev_data->scratch_len);
+ if (rc2 < 0)
+ return rc2;
+
+ if (!rc1 && !rc2)
+ /* Neither buffer requires expansion, this is wrong */
+ return -EFAULT;
+
+ *psp_ret = 0;
+ rc = sev_do_cmd(cmd, data, psp_ret);
+ }
+
+ if ((rc == 0 || rc == -EIO) && *psp_ret == SEV_RET_SPDM_REQUEST) {
+ struct spdm_dobj_hdr_resp *resp_hdr;
+ struct spdm_dobj_hdr_req *req_hdr;
+ struct sev_tio_status *tio_status = to_tio_status(dev_data);
+ size_t resp_len = tio_status->spdm_req_size_max -
+ (sla_dobj_id_to_size(SPDM_DOBJ_ID_RESP) + sizeof(struct sla_buffer_hdr));
+
+ if (!dev_data->cmd) {
+ if (WARN_ON_ONCE(!data_len || (data_len != *(u32 *) data)))
+ return -EINVAL;
+ if (WARN_ON(data_len > sizeof(dev_data->cmd_data)))
+ return -EFAULT;
+ memcpy(dev_data->cmd_data, data, data_len);
+ memset(&dev_data->cmd_data[data_len], 0xFF,
+ sizeof(dev_data->cmd_data) - data_len);
+ dev_data->cmd = cmd;
+ }
+
+ req_hdr = sla_to_dobj_req_hdr(dev_data->reqbuf);
+ resp_hdr = sla_to_dobj_resp_hdr(dev_data->respbuf);
+ switch (req_hdr->data_type) {
+ case DOBJ_DATA_TYPE_SPDM:
+ rc = PCI_DOE_FEATURE_CMA;
+ break;
+ case DOBJ_DATA_TYPE_SECURE_SPDM:
+ rc = PCI_DOE_FEATURE_SSESSION;
+ break;
+ default:
+ return -EINVAL;
+ }
+ resp_hdr->data_type = req_hdr->data_type;
+ dev_data->spdm.req_len = req_hdr->hdr.length -
+ sla_dobj_id_to_size(SPDM_DOBJ_ID_REQ);
+ dev_data->spdm.rsp_len = resp_len;
+ } else if (dev_data && dev_data->cmd) {
+ /* For either error or success just stop the bouncing */
+ memset(dev_data->cmd_data, 0, sizeof(dev_data->cmd_data));
+ dev_data->cmd = 0;
+ }
+
+ return rc;
+}
+
+int sev_tio_continue(struct tsm_dsm_tio *dev_data)
+{
+ struct spdm_dobj_hdr_resp *resp_hdr;
+ int ret;
+
+ if (!dev_data || !dev_data->cmd)
+ return -EINVAL;
+
+ resp_hdr = sla_to_dobj_resp_hdr(dev_data->respbuf);
+ resp_hdr->hdr.length = ALIGN(sla_dobj_id_to_size(SPDM_DOBJ_ID_RESP) +
+ dev_data->spdm.rsp_len, 32);
+ dev_data->respbuf->payload_sz = resp_hdr->hdr.length;
+
+ ret = sev_tio_do_cmd(dev_data->cmd, dev_data->cmd_data, 0,
+ &dev_data->psp_ret, dev_data);
+ if (ret)
+ return ret;
+
+ if (dev_data->psp_ret != SEV_RET_SUCCESS)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void spdm_ctrl_init(struct spdm_ctrl *ctrl, struct tsm_dsm_tio *dev_data)
+{
+ ctrl->req = dev_data->req;
+ ctrl->resp = dev_data->resp;
+ ctrl->scratch = dev_data->scratch;
+ ctrl->output = dev_data->output;
+}
+
+static void spdm_ctrl_free(struct tsm_dsm_tio *dev_data)
+{
+ struct sev_tio_status *tio_status = to_tio_status(dev_data);
+ size_t len = tio_status->spdm_req_size_max -
+ (sla_dobj_id_to_size(SPDM_DOBJ_ID_RESP) +
+ sizeof(struct sla_buffer_hdr));
+ struct tsm_spdm *spdm = &dev_data->spdm;
+
+ sla_buffer_unmap(dev_data->resp, dev_data->respbuf);
+ sla_buffer_unmap(dev_data->req, dev_data->reqbuf);
+ spdm->rsp = NULL;
+ spdm->req = NULL;
+ sla_free(dev_data->req, len, true);
+ sla_free(dev_data->resp, len, false);
+ sla_free(dev_data->scratch, tio_status->spdm_scratch_size_max, true);
+
+ dev_data->req.sla = 0;
+ dev_data->resp.sla = 0;
+ dev_data->scratch.sla = 0;
+ dev_data->respbuf = NULL;
+ dev_data->reqbuf = NULL;
+ sla_free(dev_data->output, tio_status->spdm_out_size_max, true);
+}
+
+static int spdm_ctrl_alloc(struct tsm_dsm_tio *dev_data)
+{
+ struct sev_tio_status *tio_status = to_tio_status(dev_data);
+ struct tsm_spdm *spdm = &dev_data->spdm;
+ int ret;
+
+ dev_data->req = sla_alloc(tio_status->spdm_req_size_max, true);
+ dev_data->resp = sla_alloc(tio_status->spdm_req_size_max, false);
+ dev_data->scratch_len = tio_status->spdm_scratch_size_max;
+ dev_data->scratch = sla_alloc(dev_data->scratch_len, true);
+ dev_data->output_len = tio_status->spdm_out_size_max;
+ dev_data->output = sla_alloc(dev_data->output_len, true);
+
+ if (IS_SLA_NULL(dev_data->req) || IS_SLA_NULL(dev_data->resp) ||
+ IS_SLA_NULL(dev_data->scratch) || IS_SLA_NULL(dev_data->dev_ctx)) {
+ ret = -ENOMEM;
+ goto free_spdm_exit;
+ }
+
+ dev_data->reqbuf = sla_buffer_map(dev_data->req);
+ dev_data->respbuf = sla_buffer_map(dev_data->resp);
+ if (!dev_data->reqbuf || !dev_data->respbuf) {
+ ret = -EFAULT;
+ goto free_spdm_exit;
+ }
+
+ spdm->req = sla_to_data(dev_data->reqbuf, SPDM_DOBJ_ID_REQ);
+ spdm->rsp = sla_to_data(dev_data->respbuf, SPDM_DOBJ_ID_RESP);
+ if (!spdm->req || !spdm->rsp) {
+ ret = -EFAULT;
+ goto free_spdm_exit;
+ }
+
+ dobj_response_init(dev_data->respbuf);
+
+ return 0;
+
+free_spdm_exit:
+ spdm_ctrl_free(dev_data);
+ return ret;
+}
+
+int sev_tio_init_locked(void *tio_status_page)
+{
+ struct sev_tio_status *tio_status = tio_status_page;
+ struct sev_data_tio_status data_status = {
+ .length = sizeof(data_status),
+ };
+ int ret, psp_ret;
+
+ data_status.status_paddr = __psp_pa(tio_status_page);
+ ret = __sev_do_cmd_locked(SEV_CMD_TIO_STATUS, &data_status, &psp_ret);
+ if (ret)
+ return ret;
+
+ if (tio_status->length < offsetofend(struct sev_tio_status, tdictx_size) ||
+ tio_status->reserved)
+ return -EFAULT;
+
+ if (!tio_status->tio_en && !tio_status->tio_init_done)
+ return -ENOENT;
+
+ if (tio_status->tio_init_done)
+ return -EBUSY;
+
+ struct sev_data_tio_init ti = { .length = sizeof(ti) };
+
+ ret = __sev_do_cmd_locked(SEV_CMD_TIO_INIT, &ti, &psp_ret);
+ if (ret)
+ return ret;
+
+ ret = __sev_do_cmd_locked(SEV_CMD_TIO_STATUS, &data_status, &psp_ret);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+int sev_tio_dev_create(struct tsm_dsm_tio *dev_data, u16 device_id,
+ u16 root_port_id, u8 segment_id)
+{
+ struct sev_tio_status *tio_status = to_tio_status(dev_data);
+ struct sev_data_tio_dev_create create = {
+ .length = sizeof(create),
+ .device_id = device_id,
+ .root_port_id = root_port_id,
+ .segment_id = segment_id,
+ };
+ void *data_pg;
+ int ret;
+
+ dev_data->dev_ctx = sla_alloc(tio_status->devctx_size, true);
+ if (IS_SLA_NULL(dev_data->dev_ctx))
+ return -ENOMEM;
+
+ data_pg = snp_alloc_firmware_page(GFP_KERNEL_ACCOUNT);
+ if (!data_pg) {
+ ret = -ENOMEM;
+ goto free_ctx_exit;
+ }
+
+ create.dev_ctx_sla = dev_data->dev_ctx;
+ ret = sev_do_cmd(SEV_CMD_TIO_DEV_CREATE, &create, &dev_data->psp_ret);
+ if (ret)
+ goto free_data_pg_exit;
+
+ dev_data->data_pg = data_pg;
+
+ return 0;
+
+free_data_pg_exit:
+ snp_free_firmware_page(data_pg);
+free_ctx_exit:
+ sla_free(create.dev_ctx_sla, tio_status->devctx_size, true);
+ return ret;
+}
+
+int sev_tio_dev_reclaim(struct tsm_dsm_tio *dev_data)
+{
+ struct sev_tio_status *tio_status = to_tio_status(dev_data);
+ struct sev_data_tio_dev_reclaim r = {
+ .length = sizeof(r),
+ .dev_ctx_sla = dev_data->dev_ctx,
+ };
+ int ret;
+
+ if (dev_data->data_pg) {
+ snp_free_firmware_page(dev_data->data_pg);
+ dev_data->data_pg = NULL;
+ }
+
+ if (IS_SLA_NULL(dev_data->dev_ctx))
+ return 0;
+
+ ret = sev_do_cmd(SEV_CMD_TIO_DEV_RECLAIM, &r, &dev_data->psp_ret);
+
+ sla_free(dev_data->dev_ctx, tio_status->devctx_size, true);
+ dev_data->dev_ctx = SLA_NULL;
+
+ spdm_ctrl_free(dev_data);
+
+ return ret;
+}
+
+int sev_tio_dev_connect(struct tsm_dsm_tio *dev_data, u8 tc_mask, u8 ids[8], u8 cert_slot)
+{
+ struct sev_data_tio_dev_connect connect = {
+ .length = sizeof(connect),
+ .tc_mask = tc_mask,
+ .cert_slot = cert_slot,
+ .dev_ctx_sla = dev_data->dev_ctx,
+ .ide_stream_id = {
+ ids[0], ids[1], ids[2], ids[3],
+ ids[4], ids[5], ids[6], ids[7]
+ },
+ };
+ int ret;
+
+ if (WARN_ON(IS_SLA_NULL(dev_data->dev_ctx)))
+ return -EFAULT;
+ if (!(tc_mask & 1))
+ return -EINVAL;
+
+ ret = spdm_ctrl_alloc(dev_data);
+ if (ret)
+ return ret;
+
+ spdm_ctrl_init(&connect.spdm_ctrl, dev_data);
+
+ return sev_tio_do_cmd(SEV_CMD_TIO_DEV_CONNECT, &connect, sizeof(connect),
+ &dev_data->psp_ret, dev_data);
+}
+
+int sev_tio_dev_disconnect(struct tsm_dsm_tio *dev_data, bool force)
+{
+ struct sev_data_tio_dev_disconnect dc = {
+ .length = sizeof(dc),
+ .dev_ctx_sla = dev_data->dev_ctx,
+ .flags = force ? TIO_DEV_DISCONNECT_FLAG_FORCE : 0,
+ };
+
+ if (WARN_ON_ONCE(IS_SLA_NULL(dev_data->dev_ctx)))
+ return -EFAULT;
+
+ spdm_ctrl_init(&dc.spdm_ctrl, dev_data);
+
+ return sev_tio_do_cmd(SEV_CMD_TIO_DEV_DISCONNECT, &dc, sizeof(dc),
+ &dev_data->psp_ret, dev_data);
+}
+
+int sev_tio_cmd_buffer_len(int cmd)
+{
+ switch (cmd) {
+ case SEV_CMD_TIO_STATUS: return sizeof(struct sev_data_tio_status);
+ case SEV_CMD_TIO_INIT: return sizeof(struct sev_data_tio_init);
+ case SEV_CMD_TIO_DEV_CREATE: return sizeof(struct sev_data_tio_dev_create);
+ case SEV_CMD_TIO_DEV_RECLAIM: return sizeof(struct sev_data_tio_dev_reclaim);
+ case SEV_CMD_TIO_DEV_CONNECT: return sizeof(struct sev_data_tio_dev_connect);
+ case SEV_CMD_TIO_DEV_DISCONNECT: return sizeof(struct sev_data_tio_dev_disconnect);
+ default: return 0;
+ }
+}
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0-only
+
+// Interface to CCP/SEV-TIO for generic PCIe TDISP module
+
+#include <linux/pci.h>
+#include <linux/device.h>
+#include <linux/tsm.h>
+#include <linux/iommu.h>
+#include <linux/pci-doe.h>
+#include <linux/bitfield.h>
+#include <linux/module.h>
+
+#include <asm/sev-common.h>
+#include <asm/sev.h>
+
+#include "psp-dev.h"
+#include "sev-dev.h"
+#include "sev-dev-tio.h"
+
+MODULE_IMPORT_NS("PCI_IDE");
+
+#define TIO_DEFAULT_NR_IDE_STREAMS 1
+
+static uint nr_ide_streams = TIO_DEFAULT_NR_IDE_STREAMS;
+module_param_named(ide_nr, nr_ide_streams, uint, 0644);
+MODULE_PARM_DESC(ide_nr, "Set the maximum number of IDE streams per PHB");
+
+#define dev_to_sp(dev) ((struct sp_device *)dev_get_drvdata(dev))
+#define dev_to_psp(dev) ((struct psp_device *)(dev_to_sp(dev)->psp_data))
+#define dev_to_sev(dev) ((struct sev_device *)(dev_to_psp(dev)->sev_data))
+#define tsm_dev_to_sev(tsmdev) dev_to_sev((tsmdev)->dev.parent)
+
+#define pdev_to_tio_dsm(pdev) (container_of((pdev)->tsm, struct tio_dsm, tsm.base_tsm))
+
+static int sev_tio_spdm_cmd(struct tio_dsm *dsm, int ret)
+{
+ struct tsm_dsm_tio *dev_data = &dsm->data;
+ struct tsm_spdm *spdm = &dev_data->spdm;
+
+ /* Check the main command handler response before entering the loop */
+ if (ret == 0 && dev_data->psp_ret != SEV_RET_SUCCESS)
+ return -EINVAL;
+
+ if (ret <= 0)
+ return ret;
+
+ /* ret > 0 means "SPDM requested" */
+ while (ret == PCI_DOE_FEATURE_CMA || ret == PCI_DOE_FEATURE_SSESSION) {
+ ret = pci_doe(dsm->tsm.doe_mb, PCI_VENDOR_ID_PCI_SIG, ret,
+ spdm->req, spdm->req_len, spdm->rsp, spdm->rsp_len);
+ if (ret < 0)
+ break;
+
+ WARN_ON_ONCE(ret == 0); /* The response should never be empty */
+ spdm->rsp_len = ret;
+ ret = sev_tio_continue(dev_data);
+ }
+
+ return ret;
+}
+
+static int stream_enable(struct pci_ide *ide)
+{
+ struct pci_dev *rp = pcie_find_root_port(ide->pdev);
+ int ret;
+
+ ret = pci_ide_stream_enable(rp, ide);
+ if (ret)
+ return ret;
+
+ ret = pci_ide_stream_enable(ide->pdev, ide);
+ if (ret)
+ pci_ide_stream_disable(rp, ide);
+
+ return ret;
+}
+
+static int streams_enable(struct pci_ide **ide)
+{
+ int ret = 0;
+
+ for (int i = 0; i < TIO_IDE_MAX_TC; ++i) {
+ if (ide[i]) {
+ ret = stream_enable(ide[i]);
+ if (ret)
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void stream_disable(struct pci_ide *ide)
+{
+ pci_ide_stream_disable(ide->pdev, ide);
+ pci_ide_stream_disable(pcie_find_root_port(ide->pdev), ide);
+}
+
+static void streams_disable(struct pci_ide **ide)
+{
+ for (int i = 0; i < TIO_IDE_MAX_TC; ++i)
+ if (ide[i])
+ stream_disable(ide[i]);
+}
+
+static void stream_setup(struct pci_ide *ide)
+{
+ struct pci_dev *rp = pcie_find_root_port(ide->pdev);
+
+ ide->partner[PCI_IDE_EP].rid_start = 0;
+ ide->partner[PCI_IDE_EP].rid_end = 0xffff;
+ ide->partner[PCI_IDE_RP].rid_start = 0;
+ ide->partner[PCI_IDE_RP].rid_end = 0xffff;
+
+ ide->pdev->ide_cfg = 0;
+ ide->pdev->ide_tee_limit = 1;
+ rp->ide_cfg = 1;
+ rp->ide_tee_limit = 0;
+
+ pci_warn(ide->pdev, "Forcing CFG/TEE for %s", pci_name(rp));
+ pci_ide_stream_setup(ide->pdev, ide);
+ pci_ide_stream_setup(rp, ide);
+}
+
+static u8 streams_setup(struct pci_ide **ide, u8 *ids)
+{
+ bool def = false;
+ u8 tc_mask = 0;
+ int i;
+
+ for (i = 0; i < TIO_IDE_MAX_TC; ++i) {
+ if (!ide[i]) {
+ ids[i] = 0xFF;
+ continue;
+ }
+
+ tc_mask |= BIT(i);
+ ids[i] = ide[i]->stream_id;
+
+ if (!def) {
+ struct pci_ide_partner *settings;
+
+ settings = pci_ide_to_settings(ide[i]->pdev, ide[i]);
+ settings->default_stream = 1;
+ def = true;
+ }
+
+ stream_setup(ide[i]);
+ }
+
+ return tc_mask;
+}
+
+static int streams_register(struct pci_ide **ide)
+{
+ int ret = 0, i;
+
+ for (i = 0; i < TIO_IDE_MAX_TC; ++i) {
+ if (ide[i]) {
+ ret = pci_ide_stream_register(ide[i]);
+ if (ret)
+ break;
+ }
+ }
+
+ return ret;
+}
+
+static void streams_unregister(struct pci_ide **ide)
+{
+ for (int i = 0; i < TIO_IDE_MAX_TC; ++i)
+ if (ide[i])
+ pci_ide_stream_unregister(ide[i]);
+}
+
+static void stream_teardown(struct pci_ide *ide)
+{
+ pci_ide_stream_teardown(ide->pdev, ide);
+ pci_ide_stream_teardown(pcie_find_root_port(ide->pdev), ide);
+}
+
+static void streams_teardown(struct pci_ide **ide)
+{
+ for (int i = 0; i < TIO_IDE_MAX_TC; ++i) {
+ if (ide[i]) {
+ stream_teardown(ide[i]);
+ pci_ide_stream_free(ide[i]);
+ ide[i] = NULL;
+ }
+ }
+}
+
+static int stream_alloc(struct pci_dev *pdev, struct pci_ide **ide,
+ unsigned int tc)
+{
+ struct pci_dev *rp = pcie_find_root_port(pdev);
+ struct pci_ide *ide1;
+
+ if (ide[tc]) {
+ pci_err(pdev, "Stream for class=%d already registered", tc);
+ return -EBUSY;
+ }
+
+ /* FIXME: find a better way */
+ if (nr_ide_streams != TIO_DEFAULT_NR_IDE_STREAMS)
+ pci_notice(pdev, "Enable non-default %d streams", nr_ide_streams);
+ pci_ide_set_nr_streams(to_pci_host_bridge(rp->bus->bridge), nr_ide_streams);
+
+ ide1 = pci_ide_stream_alloc(pdev);
+ if (!ide1)
+ return -EFAULT;
+
+ /* Blindly assign streamid=0 to TC=0, and so on */
+ ide1->stream_id = tc;
+
+ ide[tc] = ide1;
+
+ return 0;
+}
+
+static struct pci_tsm *tio_pf0_probe(struct pci_dev *pdev, struct sev_device *sev)
+{
+ struct tio_dsm *dsm __free(kfree) = kzalloc(sizeof(*dsm), GFP_KERNEL);
+ int rc;
+
+ if (!dsm)
+ return NULL;
+
+ rc = pci_tsm_pf0_constructor(pdev, &dsm->tsm, sev->tsmdev);
+ if (rc)
+ return NULL;
+
+ pci_dbg(pdev, "TSM enabled\n");
+ dsm->sev = sev;
+ return &no_free_ptr(dsm)->tsm.base_tsm;
+}
+
+static struct pci_tsm *dsm_probe(struct tsm_dev *tsmdev, struct pci_dev *pdev)
+{
+ struct sev_device *sev = tsm_dev_to_sev(tsmdev);
+
+ if (is_pci_tsm_pf0(pdev))
+ return tio_pf0_probe(pdev, sev);
+ return 0;
+}
+
+static void dsm_remove(struct pci_tsm *tsm)
+{
+ struct pci_dev *pdev = tsm->pdev;
+
+ pci_dbg(pdev, "TSM disabled\n");
+
+ if (is_pci_tsm_pf0(pdev)) {
+ struct tio_dsm *dsm = container_of(tsm, struct tio_dsm, tsm.base_tsm);
+
+ pci_tsm_pf0_destructor(&dsm->tsm);
+ kfree(dsm);
+ }
+}
+
+static int dsm_create(struct tio_dsm *dsm)
+{
+ struct pci_dev *pdev = dsm->tsm.base_tsm.pdev;
+ u8 segment_id = pdev->bus ? pci_domain_nr(pdev->bus) : 0;
+ struct pci_dev *rootport = pcie_find_root_port(pdev);
+ u16 device_id = pci_dev_id(pdev);
+ u16 root_port_id;
+ u32 lnkcap = 0;
+
+ if (pci_read_config_dword(rootport, pci_pcie_cap(rootport) + PCI_EXP_LNKCAP,
+ &lnkcap))
+ return -ENODEV;
+
+ root_port_id = FIELD_GET(PCI_EXP_LNKCAP_PN, lnkcap);
+
+ return sev_tio_dev_create(&dsm->data, device_id, root_port_id, segment_id);
+}
+
+static int dsm_connect(struct pci_dev *pdev)
+{
+ struct tio_dsm *dsm = pdev_to_tio_dsm(pdev);
+ struct tsm_dsm_tio *dev_data = &dsm->data;
+ u8 ids[TIO_IDE_MAX_TC];
+ u8 tc_mask;
+ int ret;
+
+ if (pci_find_doe_mailbox(pdev, PCI_VENDOR_ID_PCI_SIG,
+ PCI_DOE_FEATURE_SSESSION) != dsm->tsm.doe_mb) {
+ pci_err(pdev, "CMA DOE MB must support SSESSION\n");
+ return -EFAULT;
+ }
+
+ ret = stream_alloc(pdev, dev_data->ide, 0);
+ if (ret)
+ return ret;
+
+ ret = dsm_create(dsm);
+ if (ret)
+ goto ide_free_exit;
+
+ tc_mask = streams_setup(dev_data->ide, ids);
+
+ ret = sev_tio_dev_connect(dev_data, tc_mask, ids, dev_data->cert_slot);
+ ret = sev_tio_spdm_cmd(dsm, ret);
+ if (ret)
+ goto free_exit;
+
+ streams_enable(dev_data->ide);
+
+ ret = streams_register(dev_data->ide);
+ if (ret)
+ goto free_exit;
+
+ return 0;
+
+free_exit:
+ sev_tio_dev_reclaim(dev_data);
+
+ streams_disable(dev_data->ide);
+ide_free_exit:
+
+ streams_teardown(dev_data->ide);
+
+ return ret;
+}
+
+static void dsm_disconnect(struct pci_dev *pdev)
+{
+ bool force = SYSTEM_HALT <= system_state && system_state <= SYSTEM_RESTART;
+ struct tio_dsm *dsm = pdev_to_tio_dsm(pdev);
+ struct tsm_dsm_tio *dev_data = &dsm->data;
+ int ret;
+
+ ret = sev_tio_dev_disconnect(dev_data, force);
+ ret = sev_tio_spdm_cmd(dsm, ret);
+ if (ret && !force) {
+ ret = sev_tio_dev_disconnect(dev_data, true);
+ sev_tio_spdm_cmd(dsm, ret);
+ }
+
+ sev_tio_dev_reclaim(dev_data);
+
+ streams_disable(dev_data->ide);
+ streams_unregister(dev_data->ide);
+ streams_teardown(dev_data->ide);
+}
+
+static struct pci_tsm_ops sev_tsm_ops = {
+ .probe = dsm_probe,
+ .remove = dsm_remove,
+ .connect = dsm_connect,
+ .disconnect = dsm_disconnect,
+};
+
+void sev_tsm_init_locked(struct sev_device *sev, void *tio_status_page)
+{
+ struct sev_tio_status *t = kzalloc(sizeof(*t), GFP_KERNEL);
+ struct tsm_dev *tsmdev;
+ int ret;
+
+ WARN_ON(sev->tio_status);
+
+ if (!t)
+ return;
+
+ ret = sev_tio_init_locked(tio_status_page);
+ if (ret) {
+ pr_warn("SEV-TIO STATUS failed with %d\n", ret);
+ goto error_exit;
+ }
+
+ tsmdev = tsm_register(sev->dev, &sev_tsm_ops);
+ if (IS_ERR(tsmdev))
+ goto error_exit;
+
+ memcpy(t, tio_status_page, sizeof(*t));
+
+ pr_notice("SEV-TIO status: EN=%d INIT_DONE=%d rq=%d..%d rs=%d..%d "
+ "scr=%d..%d out=%d..%d dev=%d tdi=%d algos=%x\n",
+ t->tio_en, t->tio_init_done,
+ t->spdm_req_size_min, t->spdm_req_size_max,
+ t->spdm_rsp_size_min, t->spdm_rsp_size_max,
+ t->spdm_scratch_size_min, t->spdm_scratch_size_max,
+ t->spdm_out_size_min, t->spdm_out_size_max,
+ t->devctx_size, t->tdictx_size,
+ t->tio_crypto_alg);
+
+ sev->tsmdev = tsmdev;
+ sev->tio_status = t;
+
+ return;
+
+error_exit:
+ kfree(t);
+ pr_err("Failed to enable SEV-TIO: ret=%d en=%d initdone=%d SEV=%d\n",
+ ret, t->tio_en, t->tio_init_done, boot_cpu_has(X86_FEATURE_SEV));
+}
+
+void sev_tsm_uninit(struct sev_device *sev)
+{
+ if (sev->tsmdev)
+ tsm_unregister(sev->tsmdev);
+
+ sev->tsmdev = NULL;
+}
projects / thirdparty / kernel / stable.git / commitdiff
