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Diffstat (limited to 'drivers/scsi/libsas/sas_host_smp.c')
-rw-r--r--drivers/scsi/libsas/sas_host_smp.c354
1 files changed, 354 insertions, 0 deletions
diff --git a/drivers/scsi/libsas/sas_host_smp.c b/drivers/scsi/libsas/sas_host_smp.c
new file mode 100644
index 000000000..32cdc969b
--- /dev/null
+++ b/drivers/scsi/libsas/sas_host_smp.c
@@ -0,0 +1,354 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Serial Attached SCSI (SAS) Expander discovery and configuration
+ *
+ * Copyright (C) 2007 James E.J. Bottomley
+ * <James.Bottomley@HansenPartnership.com>
+ */
+#include <linux/scatterlist.h>
+#include <linux/blkdev.h>
+#include <linux/slab.h>
+#include <linux/export.h>
+
+#include "sas_internal.h"
+
+#include <scsi/scsi_transport.h>
+#include <scsi/scsi_transport_sas.h>
+#include "scsi_sas_internal.h"
+
+static void sas_host_smp_discover(struct sas_ha_struct *sas_ha, u8 *resp_data,
+ u8 phy_id)
+{
+ struct sas_phy *phy;
+ struct sas_rphy *rphy;
+
+ if (phy_id >= sas_ha->num_phys) {
+ resp_data[2] = SMP_RESP_NO_PHY;
+ return;
+ }
+ resp_data[2] = SMP_RESP_FUNC_ACC;
+
+ phy = sas_ha->sas_phy[phy_id]->phy;
+ resp_data[9] = phy_id;
+ resp_data[13] = phy->negotiated_linkrate;
+ memcpy(resp_data + 16, sas_ha->sas_addr, SAS_ADDR_SIZE);
+ memcpy(resp_data + 24, sas_ha->sas_phy[phy_id]->attached_sas_addr,
+ SAS_ADDR_SIZE);
+ resp_data[40] = (phy->minimum_linkrate << 4) |
+ phy->minimum_linkrate_hw;
+ resp_data[41] = (phy->maximum_linkrate << 4) |
+ phy->maximum_linkrate_hw;
+
+ if (!sas_ha->sas_phy[phy_id]->port ||
+ !sas_ha->sas_phy[phy_id]->port->port_dev)
+ return;
+
+ rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
+ resp_data[12] = rphy->identify.device_type << 4;
+ resp_data[14] = rphy->identify.initiator_port_protocols;
+ resp_data[15] = rphy->identify.target_port_protocols;
+}
+
+/**
+ * to_sas_gpio_gp_bit - given the gpio frame data find the byte/bit position of 'od'
+ * @od: od bit to find
+ * @data: incoming bitstream (from frame)
+ * @index: requested data register index (from frame)
+ * @count: total number of registers in the bitstream (from frame)
+ * @bit: bit position of 'od' in the returned byte
+ *
+ * returns NULL if 'od' is not in 'data'
+ *
+ * From SFF-8485 v0.7:
+ * "In GPIO_TX[1], bit 0 of byte 3 contains the first bit (i.e., OD0.0)
+ * and bit 7 of byte 0 contains the 32nd bit (i.e., OD10.1).
+ *
+ * In GPIO_TX[2], bit 0 of byte 3 contains the 33rd bit (i.e., OD10.2)
+ * and bit 7 of byte 0 contains the 64th bit (i.e., OD21.0)."
+ *
+ * The general-purpose (raw-bitstream) RX registers have the same layout
+ * although 'od' is renamed 'id' for 'input data'.
+ *
+ * SFF-8489 defines the behavior of the LEDs in response to the 'od' values.
+ */
+static u8 *to_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count, u8 *bit)
+{
+ unsigned int reg;
+ u8 byte;
+
+ /* gp registers start at index 1 */
+ if (index == 0)
+ return NULL;
+
+ index--; /* make index 0-based */
+ if (od < index * 32)
+ return NULL;
+
+ od -= index * 32;
+ reg = od >> 5;
+
+ if (reg >= count)
+ return NULL;
+
+ od &= (1 << 5) - 1;
+ byte = 3 - (od >> 3);
+ *bit = od & ((1 << 3) - 1);
+
+ return &data[reg * 4 + byte];
+}
+
+int try_test_sas_gpio_gp_bit(unsigned int od, u8 *data, u8 index, u8 count)
+{
+ u8 *byte;
+ u8 bit;
+
+ byte = to_sas_gpio_gp_bit(od, data, index, count, &bit);
+ if (!byte)
+ return -1;
+
+ return (*byte >> bit) & 1;
+}
+EXPORT_SYMBOL(try_test_sas_gpio_gp_bit);
+
+static int sas_host_smp_write_gpio(struct sas_ha_struct *sas_ha, u8 *resp_data,
+ u8 reg_type, u8 reg_index, u8 reg_count,
+ u8 *req_data)
+{
+ struct sas_internal *i = to_sas_internal(sas_ha->core.shost->transportt);
+ int written;
+
+ if (i->dft->lldd_write_gpio == NULL) {
+ resp_data[2] = SMP_RESP_FUNC_UNK;
+ return 0;
+ }
+
+ written = i->dft->lldd_write_gpio(sas_ha, reg_type, reg_index,
+ reg_count, req_data);
+
+ if (written < 0) {
+ resp_data[2] = SMP_RESP_FUNC_FAILED;
+ written = 0;
+ } else
+ resp_data[2] = SMP_RESP_FUNC_ACC;
+
+ return written;
+}
+
+static void sas_report_phy_sata(struct sas_ha_struct *sas_ha, u8 *resp_data,
+ u8 phy_id)
+{
+ struct sas_rphy *rphy;
+ struct dev_to_host_fis *fis;
+ int i;
+
+ if (phy_id >= sas_ha->num_phys) {
+ resp_data[2] = SMP_RESP_NO_PHY;
+ return;
+ }
+
+ resp_data[2] = SMP_RESP_PHY_NO_SATA;
+
+ if (!sas_ha->sas_phy[phy_id]->port)
+ return;
+
+ rphy = sas_ha->sas_phy[phy_id]->port->port_dev->rphy;
+ fis = (struct dev_to_host_fis *)
+ sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd;
+ if (rphy->identify.target_port_protocols != SAS_PROTOCOL_SATA)
+ return;
+
+ resp_data[2] = SMP_RESP_FUNC_ACC;
+ resp_data[9] = phy_id;
+ memcpy(resp_data + 16, sas_ha->sas_phy[phy_id]->attached_sas_addr,
+ SAS_ADDR_SIZE);
+
+ /* check to see if we have a valid d2h fis */
+ if (fis->fis_type != 0x34)
+ return;
+
+ /* the d2h fis is required by the standard to be in LE format */
+ for (i = 0; i < 20; i += 4) {
+ u8 *dst = resp_data + 24 + i, *src =
+ &sas_ha->sas_phy[phy_id]->port->port_dev->frame_rcvd[i];
+ dst[0] = src[3];
+ dst[1] = src[2];
+ dst[2] = src[1];
+ dst[3] = src[0];
+ }
+}
+
+static void sas_phy_control(struct sas_ha_struct *sas_ha, u8 phy_id,
+ u8 phy_op, enum sas_linkrate min,
+ enum sas_linkrate max, u8 *resp_data)
+{
+ struct sas_internal *i =
+ to_sas_internal(sas_ha->core.shost->transportt);
+ struct sas_phy_linkrates rates;
+ struct asd_sas_phy *asd_phy;
+
+ if (phy_id >= sas_ha->num_phys) {
+ resp_data[2] = SMP_RESP_NO_PHY;
+ return;
+ }
+
+ asd_phy = sas_ha->sas_phy[phy_id];
+ switch (phy_op) {
+ case PHY_FUNC_NOP:
+ case PHY_FUNC_LINK_RESET:
+ case PHY_FUNC_HARD_RESET:
+ case PHY_FUNC_DISABLE:
+ case PHY_FUNC_CLEAR_ERROR_LOG:
+ case PHY_FUNC_CLEAR_AFFIL:
+ case PHY_FUNC_TX_SATA_PS_SIGNAL:
+ break;
+
+ default:
+ resp_data[2] = SMP_RESP_PHY_UNK_OP;
+ return;
+ }
+
+ rates.minimum_linkrate = min;
+ rates.maximum_linkrate = max;
+
+ /* filter reset requests through libata eh */
+ if (phy_op == PHY_FUNC_LINK_RESET && sas_try_ata_reset(asd_phy) == 0) {
+ resp_data[2] = SMP_RESP_FUNC_ACC;
+ return;
+ }
+
+ if (i->dft->lldd_control_phy(asd_phy, phy_op, &rates))
+ resp_data[2] = SMP_RESP_FUNC_FAILED;
+ else
+ resp_data[2] = SMP_RESP_FUNC_ACC;
+}
+
+void sas_smp_host_handler(struct bsg_job *job, struct Scsi_Host *shost)
+{
+ struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
+ u8 *req_data, *resp_data;
+ unsigned int reslen = 0;
+ int error = -EINVAL;
+
+ /* eight is the minimum size for request and response frames */
+ if (job->request_payload.payload_len < 8 ||
+ job->reply_payload.payload_len < 8)
+ goto out;
+
+ error = -ENOMEM;
+ req_data = kzalloc(job->request_payload.payload_len, GFP_KERNEL);
+ if (!req_data)
+ goto out;
+ sg_copy_to_buffer(job->request_payload.sg_list,
+ job->request_payload.sg_cnt, req_data,
+ job->request_payload.payload_len);
+
+ /* make sure frame can always be built ... we copy
+ * back only the requested length */
+ resp_data = kzalloc(max(job->reply_payload.payload_len, 128U),
+ GFP_KERNEL);
+ if (!resp_data)
+ goto out_free_req;
+
+ error = -EINVAL;
+ if (req_data[0] != SMP_REQUEST)
+ goto out_free_resp;
+
+ /* set up default don't know response */
+ resp_data[0] = SMP_RESPONSE;
+ resp_data[1] = req_data[1];
+ resp_data[2] = SMP_RESP_FUNC_UNK;
+
+ switch (req_data[1]) {
+ case SMP_REPORT_GENERAL:
+ resp_data[2] = SMP_RESP_FUNC_ACC;
+ resp_data[9] = sas_ha->num_phys;
+ reslen = 32;
+ break;
+
+ case SMP_REPORT_MANUF_INFO:
+ resp_data[2] = SMP_RESP_FUNC_ACC;
+ memcpy(resp_data + 12, shost->hostt->name,
+ SAS_EXPANDER_VENDOR_ID_LEN);
+ memcpy(resp_data + 20, "libsas virt phy",
+ SAS_EXPANDER_PRODUCT_ID_LEN);
+ reslen = 64;
+ break;
+
+ case SMP_READ_GPIO_REG:
+ /* FIXME: need GPIO support in the transport class */
+ break;
+
+ case SMP_DISCOVER:
+ if (job->request_payload.payload_len < 16)
+ goto out_free_resp;
+ sas_host_smp_discover(sas_ha, resp_data, req_data[9]);
+ reslen = 56;
+ break;
+
+ case SMP_REPORT_PHY_ERR_LOG:
+ /* FIXME: could implement this with additional
+ * libsas callbacks providing the HW supports it */
+ break;
+
+ case SMP_REPORT_PHY_SATA:
+ if (job->request_payload.payload_len < 16)
+ goto out_free_resp;
+ sas_report_phy_sata(sas_ha, resp_data, req_data[9]);
+ reslen = 60;
+ break;
+
+ case SMP_REPORT_ROUTE_INFO:
+ /* Can't implement; hosts have no routes */
+ break;
+
+ case SMP_WRITE_GPIO_REG: {
+ /* SFF-8485 v0.7 */
+ const int base_frame_size = 11;
+ int to_write = req_data[4];
+
+ if (job->request_payload.payload_len <
+ base_frame_size + to_write * 4) {
+ resp_data[2] = SMP_RESP_INV_FRM_LEN;
+ break;
+ }
+
+ to_write = sas_host_smp_write_gpio(sas_ha, resp_data, req_data[2],
+ req_data[3], to_write, &req_data[8]);
+ reslen = 8;
+ break;
+ }
+
+ case SMP_CONF_ROUTE_INFO:
+ /* Can't implement; hosts have no routes */
+ break;
+
+ case SMP_PHY_CONTROL:
+ if (job->request_payload.payload_len < 44)
+ goto out_free_resp;
+ sas_phy_control(sas_ha, req_data[9], req_data[10],
+ req_data[32] >> 4, req_data[33] >> 4,
+ resp_data);
+ reslen = 8;
+ break;
+
+ case SMP_PHY_TEST_FUNCTION:
+ /* FIXME: should this be implemented? */
+ break;
+
+ default:
+ /* probably a 2.0 function */
+ break;
+ }
+
+ sg_copy_from_buffer(job->reply_payload.sg_list,
+ job->reply_payload.sg_cnt, resp_data,
+ job->reply_payload.payload_len);
+
+ error = 0;
+out_free_resp:
+ kfree(resp_data);
+out_free_req:
+ kfree(req_data);
+out:
+ bsg_job_done(job, error, reslen);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-05 08:20:37 +0000