d795ddad36
When the availability of a pci function has changed by means outside of our control we receive an availability event. Implement/improve the handling of these notifications. Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
/*
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* Copyright IBM Corp. 2012
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*
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* Author(s):
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* Jan Glauber <jang@linux.vnet.ibm.com>
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*/
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#define COMPONENT "zPCI"
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#define pr_fmt(fmt) COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <asm/pci_debug.h>
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#include <asm/sclp.h>
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/* Content Code Description for PCI Function Error */
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struct zpci_ccdf_err {
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u32 reserved1;
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u32 fh; /* function handle */
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u32 fid; /* function id */
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u32 ett : 4; /* expected table type */
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u32 mvn : 12; /* MSI vector number */
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u32 dmaas : 8; /* DMA address space */
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u32 : 6;
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u32 q : 1; /* event qualifier */
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u32 rw : 1; /* read/write */
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u64 faddr; /* failing address */
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u32 reserved3;
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u16 reserved4;
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u16 pec; /* PCI event code */
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} __packed;
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/* Content Code Description for PCI Function Availability */
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struct zpci_ccdf_avail {
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u32 reserved1;
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u32 fh; /* function handle */
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u32 fid; /* function id */
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u32 reserved2;
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u32 reserved3;
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u32 reserved4;
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u32 reserved5;
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u16 reserved6;
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u16 pec; /* PCI event code */
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} __packed;
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void zpci_event_error(void *data)
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{
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struct zpci_ccdf_err *ccdf = data;
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struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
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zpci_err("error CCDF:\n");
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zpci_err_hex(ccdf, sizeof(*ccdf));
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if (!zdev)
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return;
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pr_err("%s: Event 0x%x reports an error for PCI function 0x%x\n",
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pci_name(zdev->pdev), ccdf->pec, ccdf->fid);
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}
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void zpci_event_availability(void *data)
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{
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struct zpci_ccdf_avail *ccdf = data;
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struct zpci_dev *zdev = get_zdev_by_fid(ccdf->fid);
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struct pci_dev *pdev = zdev ? zdev->pdev : NULL;
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int ret;
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pr_info("%s: Event 0x%x reconfigured PCI function 0x%x\n",
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pdev ? pci_name(pdev) : "n/a", ccdf->pec, ccdf->fid);
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zpci_err("avail CCDF:\n");
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zpci_err_hex(ccdf, sizeof(*ccdf));
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switch (ccdf->pec) {
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case 0x0301: /* Standby -> Configured */
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if (!zdev || zdev->state == ZPCI_FN_STATE_CONFIGURED)
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break;
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zdev->state = ZPCI_FN_STATE_CONFIGURED;
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ret = zpci_enable_device(zdev);
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if (ret)
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break;
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pci_rescan_bus(zdev->bus);
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break;
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case 0x0302: /* Reserved -> Standby */
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clp_add_pci_device(ccdf->fid, ccdf->fh, 0);
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break;
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case 0x0303: /* Deconfiguration requested */
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if (pdev)
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pci_stop_and_remove_bus_device(pdev);
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ret = zpci_disable_device(zdev);
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if (ret)
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break;
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ret = sclp_pci_deconfigure(zdev->fid);
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zpci_dbg(3, "deconf fid:%x, rc:%d\n", zdev->fid, ret);
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if (!ret)
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zdev->state = ZPCI_FN_STATE_STANDBY;
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break;
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case 0x0304: /* Configured -> Standby */
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if (pdev)
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pci_stop_and_remove_bus_device(pdev);
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zpci_disable_device(zdev);
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zdev->state = ZPCI_FN_STATE_STANDBY;
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break;
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case 0x0306: /* 0x308 or 0x302 for multiple devices */
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clp_rescan_pci_devices();
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break;
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case 0x0308: /* Standby -> Reserved */
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pci_stop_root_bus(zdev->bus);
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pci_remove_root_bus(zdev->bus);
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break;
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default:
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break;
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}
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}
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