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