diff options
author | 2016-04-11 10:41:07 +0300 | |
---|---|---|
committer | 2016-04-13 08:17:18 +0300 | |
commit | e09b41010ba33a20a87472ee821fa407a5b8da36 (patch) | |
tree | d10dc367189862e7ca5c592f033dc3726e1df4e3 /kernel/drivers/misc/cxl/pci.c | |
parent | f93b97fd65072de626c074dbe099a1fff05ce060 (diff) |
These changes are the raw update to linux-4.4.6-rt14. Kernel sources
are taken from kernel.org, and rt patch from the rt wiki download page.
During the rebasing, the following patch collided:
Force tick interrupt and get rid of softirq magic(I70131fb85).
Collisions have been removed because its logic was found on the
source already.
Change-Id: I7f57a4081d9deaa0d9ccfc41a6c8daccdee3b769
Signed-off-by: José Pekkarinen <jose.pekkarinen@nokia.com>
Diffstat (limited to 'kernel/drivers/misc/cxl/pci.c')
-rw-r--r-- | kernel/drivers/misc/cxl/pci.c | 725 |
1 files changed, 606 insertions, 119 deletions
diff --git a/kernel/drivers/misc/cxl/pci.c b/kernel/drivers/misc/cxl/pci.c index 4f1b0bdb9..be2c8e248 100644 --- a/kernel/drivers/misc/cxl/pci.c +++ b/kernel/drivers/misc/cxl/pci.c @@ -24,6 +24,7 @@ #include <asm/io.h> #include "cxl.h" +#include <misc/cxl.h> #define CXL_PCI_VSEC_ID 0x1280 @@ -90,6 +91,7 @@ /* This works a little different than the p1/p2 register accesses to make it * easier to pull out individual fields */ #define AFUD_READ(afu, off) in_be64(afu->afu_desc_mmio + off) +#define AFUD_READ_LE(afu, off) in_le64(afu->afu_desc_mmio + off) #define EXTRACT_PPC_BIT(val, bit) (!!(val & PPC_BIT(bit))) #define EXTRACT_PPC_BITS(val, bs, be) ((val & PPC_BITMASK(bs, be)) >> PPC_BITLSHIFT(be)) @@ -132,7 +134,7 @@ u8 cxl_afu_cr_read8(struct cxl_afu *afu, int cr, u64 off) return (val >> ((off & 0x3) * 8)) & 0xff; } -static DEFINE_PCI_DEVICE_TABLE(cxl_pci_tbl) = { +static const struct pci_device_id cxl_pci_tbl[] = { { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x0477), }, { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x044b), }, { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x04cf), }, @@ -204,7 +206,7 @@ static void dump_cxl_config_space(struct pci_dev *dev) dev_info(&dev->dev, "p1 regs: %#llx, len: %#llx\n", p1_base(dev), p1_size(dev)); dev_info(&dev->dev, "p2 regs: %#llx, len: %#llx\n", - p1_base(dev), p2_size(dev)); + p2_base(dev), p2_size(dev)); dev_info(&dev->dev, "BAR 4/5: %#llx, len: %#llx\n", pci_resource_start(dev, 4), pci_resource_len(dev, 4)); @@ -286,7 +288,8 @@ static void dump_cxl_config_space(struct pci_dev *dev) static void dump_afu_descriptor(struct cxl_afu *afu) { - u64 val; + u64 val, afu_cr_num, afu_cr_off, afu_cr_len; + int i; #define show_reg(name, what) \ dev_info(&afu->dev, "afu desc: %30s: %#llx\n", name, what) @@ -296,6 +299,7 @@ static void dump_afu_descriptor(struct cxl_afu *afu) show_reg("num_of_processes", AFUD_NUM_PROCS(val)); show_reg("num_of_afu_CRs", AFUD_NUM_CRS(val)); show_reg("req_prog_mode", val & 0xffffULL); + afu_cr_num = AFUD_NUM_CRS(val); val = AFUD_READ(afu, 0x8); show_reg("Reserved", val); @@ -307,8 +311,10 @@ static void dump_afu_descriptor(struct cxl_afu *afu) val = AFUD_READ_CR(afu); show_reg("Reserved", (val >> (63-7)) & 0xff); show_reg("AFU_CR_len", AFUD_CR_LEN(val)); + afu_cr_len = AFUD_CR_LEN(val) * 256; val = AFUD_READ_CR_OFF(afu); + afu_cr_off = val; show_reg("AFU_CR_offset", val); val = AFUD_READ_PPPSA(afu); @@ -325,6 +331,11 @@ static void dump_afu_descriptor(struct cxl_afu *afu) val = AFUD_READ_EB_OFF(afu); show_reg("AFU_EB_offset", val); + for (i = 0; i < afu_cr_num; i++) { + val = AFUD_READ_LE(afu, afu_cr_off + i * afu_cr_len); + show_reg("CR Vendor", val & 0xffff); + show_reg("CR Device", (val >> 16) & 0xffff); + } #undef show_reg } @@ -359,6 +370,55 @@ static int init_implementation_adapter_regs(struct cxl *adapter, struct pci_dev return 0; } +#define TBSYNC_CNT(n) (((u64)n & 0x7) << (63-6)) +#define _2048_250MHZ_CYCLES 1 + +static int cxl_setup_psl_timebase(struct cxl *adapter, struct pci_dev *dev) +{ + u64 psl_tb; + int delta; + unsigned int retry = 0; + struct device_node *np; + + if (!(np = pnv_pci_get_phb_node(dev))) + return -ENODEV; + + /* Do not fail when CAPP timebase sync is not supported by OPAL */ + of_node_get(np); + if (! of_get_property(np, "ibm,capp-timebase-sync", NULL)) { + of_node_put(np); + pr_err("PSL: Timebase sync: OPAL support missing\n"); + return 0; + } + of_node_put(np); + + /* + * Setup PSL Timebase Control and Status register + * with the recommended Timebase Sync Count value + */ + cxl_p1_write(adapter, CXL_PSL_TB_CTLSTAT, + TBSYNC_CNT(2 * _2048_250MHZ_CYCLES)); + + /* Enable PSL Timebase */ + cxl_p1_write(adapter, CXL_PSL_Control, 0x0000000000000000); + cxl_p1_write(adapter, CXL_PSL_Control, CXL_PSL_Control_tb); + + /* Wait until CORE TB and PSL TB difference <= 16usecs */ + do { + msleep(1); + if (retry++ > 5) { + pr_err("PSL: Timebase sync: giving up!\n"); + return -EIO; + } + psl_tb = cxl_p1_read(adapter, CXL_PSL_Timebase); + delta = mftb() - psl_tb; + if (delta < 0) + delta = -delta; + } while (tb_to_ns(delta) > 16000); + + return 0; +} + static int init_implementation_afu_regs(struct cxl_afu *afu) { /* read/write masks for this slice */ @@ -529,10 +589,18 @@ err: static void cxl_unmap_slice_regs(struct cxl_afu *afu) { - if (afu->p1n_mmio) + if (afu->p2n_mmio) { iounmap(afu->p2n_mmio); - if (afu->p1n_mmio) + afu->p2n_mmio = NULL; + } + if (afu->p1n_mmio) { iounmap(afu->p1n_mmio); + afu->p1n_mmio = NULL; + } + if (afu->afu_desc_mmio) { + iounmap(afu->afu_desc_mmio); + afu->afu_desc_mmio = NULL; + } } static void cxl_release_afu(struct device *dev) @@ -541,6 +609,9 @@ static void cxl_release_afu(struct device *dev) pr_devel("cxl_release_afu\n"); + idr_destroy(&afu->contexts_idr); + cxl_release_spa(afu); + kfree(afu); } @@ -593,6 +664,22 @@ static int cxl_read_afu_descriptor(struct cxl_afu *afu) afu->crs_len = AFUD_CR_LEN(val) * 256; afu->crs_offset = AFUD_READ_CR_OFF(afu); + + /* eb_len is in multiple of 4K */ + afu->eb_len = AFUD_EB_LEN(AFUD_READ_EB(afu)) * 4096; + afu->eb_offset = AFUD_READ_EB_OFF(afu); + + /* eb_off is 4K aligned so lower 12 bits are always zero */ + if (EXTRACT_PPC_BITS(afu->eb_offset, 0, 11) != 0) { + dev_warn(&afu->dev, + "Invalid AFU error buffer offset %Lx\n", + afu->eb_offset); + dev_info(&afu->dev, + "Ignoring AFU error buffer in the descriptor\n"); + /* indicate that no afu buffer exists */ + afu->eb_len = 0; + } + return 0; } @@ -630,8 +717,8 @@ static int sanitise_afu_regs(struct cxl_afu *afu) */ reg = cxl_p2n_read(afu, CXL_AFU_Cntl_An); if ((reg & CXL_AFU_Cntl_An_ES_MASK) != CXL_AFU_Cntl_An_ES_Disabled) { - dev_warn(&afu->dev, "WARNING: AFU was not disabled: %#.16llx\n", reg); - if (cxl_afu_reset(afu)) + dev_warn(&afu->dev, "WARNING: AFU was not disabled: %#016llx\n", reg); + if (__cxl_afu_reset(afu)) return -EIO; if (cxl_afu_disable(afu)) return -EIO; @@ -651,7 +738,7 @@ static int sanitise_afu_regs(struct cxl_afu *afu) cxl_p2n_write(afu, CXL_SSTP0_An, 0x0000000000000000); reg = cxl_p2n_read(afu, CXL_PSL_DSISR_An); if (reg) { - dev_warn(&afu->dev, "AFU had pending DSISR: %#.16llx\n", reg); + dev_warn(&afu->dev, "AFU had pending DSISR: %#016llx\n", reg); if (reg & CXL_PSL_DSISR_TRANS) cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE); else @@ -660,57 +747,126 @@ static int sanitise_afu_regs(struct cxl_afu *afu) reg = cxl_p1n_read(afu, CXL_PSL_SERR_An); if (reg) { if (reg & ~0xffff) - dev_warn(&afu->dev, "AFU had pending SERR: %#.16llx\n", reg); + dev_warn(&afu->dev, "AFU had pending SERR: %#016llx\n", reg); cxl_p1n_write(afu, CXL_PSL_SERR_An, reg & ~0xffff); } reg = cxl_p2n_read(afu, CXL_PSL_ErrStat_An); if (reg) { - dev_warn(&afu->dev, "AFU had pending error status: %#.16llx\n", reg); + dev_warn(&afu->dev, "AFU had pending error status: %#016llx\n", reg); cxl_p2n_write(afu, CXL_PSL_ErrStat_An, reg); } return 0; } -static int cxl_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) +#define ERR_BUFF_MAX_COPY_SIZE PAGE_SIZE +/* + * afu_eb_read: + * Called from sysfs and reads the afu error info buffer. The h/w only supports + * 4/8 bytes aligned access. So in case the requested offset/count arent 8 byte + * aligned the function uses a bounce buffer which can be max PAGE_SIZE. + */ +ssize_t cxl_afu_read_err_buffer(struct cxl_afu *afu, char *buf, + loff_t off, size_t count) { - struct cxl_afu *afu; - bool free = true; - int rc; + loff_t aligned_start, aligned_end; + size_t aligned_length; + void *tbuf; + const void __iomem *ebuf = afu->afu_desc_mmio + afu->eb_offset; + + if (count == 0 || off < 0 || (size_t)off >= afu->eb_len) + return 0; + + /* calculate aligned read window */ + count = min((size_t)(afu->eb_len - off), count); + aligned_start = round_down(off, 8); + aligned_end = round_up(off + count, 8); + aligned_length = aligned_end - aligned_start; + + /* max we can copy in one read is PAGE_SIZE */ + if (aligned_length > ERR_BUFF_MAX_COPY_SIZE) { + aligned_length = ERR_BUFF_MAX_COPY_SIZE; + count = ERR_BUFF_MAX_COPY_SIZE - (off & 0x7); + } - if (!(afu = cxl_alloc_afu(adapter, slice))) + /* use bounce buffer for copy */ + tbuf = (void *)__get_free_page(GFP_TEMPORARY); + if (!tbuf) return -ENOMEM; - if ((rc = dev_set_name(&afu->dev, "afu%i.%i", adapter->adapter_num, slice))) - goto err1; + /* perform aligned read from the mmio region */ + memcpy_fromio(tbuf, ebuf + aligned_start, aligned_length); + memcpy(buf, tbuf + (off & 0x7), count); + + free_page((unsigned long)tbuf); + + return count; +} + +static int cxl_configure_afu(struct cxl_afu *afu, struct cxl *adapter, struct pci_dev *dev) +{ + int rc; if ((rc = cxl_map_slice_regs(afu, adapter, dev))) - goto err1; + return rc; if ((rc = sanitise_afu_regs(afu))) - goto err2; + goto err1; /* We need to reset the AFU before we can read the AFU descriptor */ - if ((rc = cxl_afu_reset(afu))) - goto err2; + if ((rc = __cxl_afu_reset(afu))) + goto err1; if (cxl_verbose) dump_afu_descriptor(afu); if ((rc = cxl_read_afu_descriptor(afu))) - goto err2; + goto err1; if ((rc = cxl_afu_descriptor_looks_ok(afu))) - goto err2; + goto err1; if ((rc = init_implementation_afu_regs(afu))) - goto err2; + goto err1; if ((rc = cxl_register_serr_irq(afu))) - goto err2; + goto err1; if ((rc = cxl_register_psl_irq(afu))) - goto err3; + goto err2; + + return 0; + +err2: + cxl_release_serr_irq(afu); +err1: + cxl_unmap_slice_regs(afu); + return rc; +} + +static void cxl_deconfigure_afu(struct cxl_afu *afu) +{ + cxl_release_psl_irq(afu); + cxl_release_serr_irq(afu); + cxl_unmap_slice_regs(afu); +} + +static int cxl_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) +{ + struct cxl_afu *afu; + int rc; + + afu = cxl_alloc_afu(adapter, slice); + if (!afu) + return -ENOMEM; + + rc = dev_set_name(&afu->dev, "afu%i.%i", adapter->adapter_num, slice); + if (rc) + goto err_free; + + rc = cxl_configure_afu(afu, adapter, dev); + if (rc) + goto err_free; /* Don't care if this fails */ cxl_debugfs_afu_add(afu); @@ -725,29 +881,23 @@ static int cxl_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) if ((rc = cxl_sysfs_afu_add(afu))) goto err_put1; - - if ((rc = cxl_afu_select_best_mode(afu))) - goto err_put2; - adapter->afu[afu->slice] = afu; + if ((rc = cxl_pci_vphb_add(afu))) + dev_info(&afu->dev, "Can't register vPHB\n"); + return 0; -err_put2: - cxl_sysfs_afu_remove(afu); err_put1: - device_unregister(&afu->dev); - free = false; + cxl_deconfigure_afu(afu); cxl_debugfs_afu_remove(afu); - cxl_release_psl_irq(afu); -err3: - cxl_release_serr_irq(afu); -err2: - cxl_unmap_slice_regs(afu); -err1: - if (free) - kfree(afu); + device_unregister(&afu->dev); return rc; + +err_free: + kfree(afu); + return rc; + } static void cxl_remove_afu(struct cxl_afu *afu) @@ -767,10 +917,7 @@ static void cxl_remove_afu(struct cxl_afu *afu) cxl_context_detach_all(afu); cxl_afu_deactivate_mode(afu); - cxl_release_psl_irq(afu); - cxl_release_serr_irq(afu); - cxl_unmap_slice_regs(afu); - + cxl_deconfigure_afu(afu); device_unregister(&afu->dev); } @@ -779,6 +926,12 @@ int cxl_reset(struct cxl *adapter) struct pci_dev *dev = to_pci_dev(adapter->dev.parent); int rc; + if (adapter->perst_same_image) { + dev_warn(&dev->dev, + "cxl: refusing to reset/reflash when perst_reloads_same_image is set.\n"); + return -EINVAL; + } + dev_info(&dev->dev, "CXL reset\n"); /* pcie_warm_reset requests a fundamental pci reset which includes a @@ -799,7 +952,7 @@ static int cxl_map_adapter_regs(struct cxl *adapter, struct pci_dev *dev) if (pci_request_region(dev, 0, "priv 1 regs")) goto err2; - pr_devel("cxl_map_adapter_regs: p1: %#.16llx %#llx, p2: %#.16llx %#llx", + pr_devel("cxl_map_adapter_regs: p1: %#016llx %#llx, p2: %#016llx %#llx", p1_base(dev), p1_size(dev), p2_base(dev), p2_size(dev)); if (!(adapter->p1_mmio = ioremap(p1_base(dev), p1_size(dev)))) @@ -823,10 +976,16 @@ err1: static void cxl_unmap_adapter_regs(struct cxl *adapter) { - if (adapter->p1_mmio) + if (adapter->p1_mmio) { iounmap(adapter->p1_mmio); - if (adapter->p2_mmio) + adapter->p1_mmio = NULL; + pci_release_region(to_pci_dev(adapter->dev.parent), 2); + } + if (adapter->p2_mmio) { iounmap(adapter->p2_mmio); + adapter->p2_mmio = NULL; + pci_release_region(to_pci_dev(adapter->dev.parent), 0); + } } static int cxl_read_vsec(struct cxl *adapter, struct pci_dev *dev) @@ -838,13 +997,13 @@ static int cxl_read_vsec(struct cxl *adapter, struct pci_dev *dev) u8 image_state; if (!(vsec = find_cxl_vsec(dev))) { - dev_err(&adapter->dev, "ABORTING: CXL VSEC not found!\n"); + dev_err(&dev->dev, "ABORTING: CXL VSEC not found!\n"); return -ENODEV; } CXL_READ_VSEC_LENGTH(dev, vsec, &vseclen); if (vseclen < CXL_VSEC_MIN_SIZE) { - pr_err("ABORTING: CXL VSEC too short\n"); + dev_err(&dev->dev, "ABORTING: CXL VSEC too short\n"); return -EINVAL; } @@ -855,7 +1014,6 @@ static int cxl_read_vsec(struct cxl *adapter, struct pci_dev *dev) CXL_READ_VSEC_BASE_IMAGE(dev, vsec, &adapter->base_image); CXL_READ_VSEC_IMAGE_STATE(dev, vsec, &image_state); adapter->user_image_loaded = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED); - adapter->perst_loads_image = true; adapter->perst_select_user = !!(image_state & CXL_VSEC_USER_IMAGE_LOADED); CXL_READ_VSEC_NAFUS(dev, vsec, &adapter->slices); @@ -877,30 +1035,56 @@ static int cxl_read_vsec(struct cxl *adapter, struct pci_dev *dev) return 0; } +/* + * Workaround a PCIe Host Bridge defect on some cards, that can cause + * malformed Transaction Layer Packet (TLP) errors to be erroneously + * reported. Mask this error in the Uncorrectable Error Mask Register. + * + * The upper nibble of the PSL revision is used to distinguish between + * different cards. The affected ones have it set to 0. + */ +static void cxl_fixup_malformed_tlp(struct cxl *adapter, struct pci_dev *dev) +{ + int aer; + u32 data; + + if (adapter->psl_rev & 0xf000) + return; + if (!(aer = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_ERR))) + return; + pci_read_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, &data); + if (data & PCI_ERR_UNC_MALF_TLP) + if (data & PCI_ERR_UNC_INTN) + return; + data |= PCI_ERR_UNC_MALF_TLP; + data |= PCI_ERR_UNC_INTN; + pci_write_config_dword(dev, aer + PCI_ERR_UNCOR_MASK, data); +} + static int cxl_vsec_looks_ok(struct cxl *adapter, struct pci_dev *dev) { if (adapter->vsec_status & CXL_STATUS_SECOND_PORT) return -EBUSY; if (adapter->vsec_status & CXL_UNSUPPORTED_FEATURES) { - dev_err(&adapter->dev, "ABORTING: CXL requires unsupported features\n"); + dev_err(&dev->dev, "ABORTING: CXL requires unsupported features\n"); return -EINVAL; } if (!adapter->slices) { /* Once we support dynamic reprogramming we can use the card if * it supports loadable AFUs */ - dev_err(&adapter->dev, "ABORTING: Device has no AFUs\n"); + dev_err(&dev->dev, "ABORTING: Device has no AFUs\n"); return -EINVAL; } if (!adapter->afu_desc_off || !adapter->afu_desc_size) { - dev_err(&adapter->dev, "ABORTING: VSEC shows no AFU descriptors\n"); + dev_err(&dev->dev, "ABORTING: VSEC shows no AFU descriptors\n"); return -EINVAL; } if (adapter->ps_size > p2_size(dev) - adapter->ps_off) { - dev_err(&adapter->dev, "ABORTING: Problem state size larger than " + dev_err(&dev->dev, "ABORTING: Problem state size larger than " "available in BAR2: 0x%llx > 0x%llx\n", adapter->ps_size, p2_size(dev) - adapter->ps_off); return -EINVAL; @@ -915,78 +1099,140 @@ static void cxl_release_adapter(struct device *dev) pr_devel("cxl_release_adapter\n"); + cxl_remove_adapter_nr(adapter); + kfree(adapter); } -static struct cxl *cxl_alloc_adapter(struct pci_dev *dev) +static struct cxl *cxl_alloc_adapter(void) { struct cxl *adapter; if (!(adapter = kzalloc(sizeof(struct cxl), GFP_KERNEL))) return NULL; - adapter->dev.parent = &dev->dev; - adapter->dev.release = cxl_release_adapter; - pci_set_drvdata(dev, adapter); spin_lock_init(&adapter->afu_list_lock); + if (cxl_alloc_adapter_nr(adapter)) + goto err1; + + if (dev_set_name(&adapter->dev, "card%i", adapter->adapter_num)) + goto err2; + return adapter; + +err2: + cxl_remove_adapter_nr(adapter); +err1: + kfree(adapter); + return NULL; } +#define CXL_PSL_ErrIVTE_tberror (0x1ull << (63-31)) + static int sanitise_adapter_regs(struct cxl *adapter) { - cxl_p1_write(adapter, CXL_PSL_ErrIVTE, 0x0000000000000000); + /* Clear PSL tberror bit by writing 1 to it */ + cxl_p1_write(adapter, CXL_PSL_ErrIVTE, CXL_PSL_ErrIVTE_tberror); return cxl_tlb_slb_invalidate(adapter); } -static struct cxl *cxl_init_adapter(struct pci_dev *dev) +/* This should contain *only* operations that can safely be done in + * both creation and recovery. + */ +static int cxl_configure_adapter(struct cxl *adapter, struct pci_dev *dev) { - struct cxl *adapter; - bool free = true; int rc; + adapter->dev.parent = &dev->dev; + adapter->dev.release = cxl_release_adapter; + pci_set_drvdata(dev, adapter); - if (!(adapter = cxl_alloc_adapter(dev))) - return ERR_PTR(-ENOMEM); + rc = pci_enable_device(dev); + if (rc) { + dev_err(&dev->dev, "pci_enable_device failed: %i\n", rc); + return rc; + } - if ((rc = switch_card_to_cxl(dev))) - goto err1; + if ((rc = cxl_read_vsec(adapter, dev))) + return rc; - if ((rc = cxl_alloc_adapter_nr(adapter))) - goto err1; + if ((rc = cxl_vsec_looks_ok(adapter, dev))) + return rc; - if ((rc = dev_set_name(&adapter->dev, "card%i", adapter->adapter_num))) - goto err2; + cxl_fixup_malformed_tlp(adapter, dev); - if ((rc = cxl_read_vsec(adapter, dev))) - goto err2; + if ((rc = setup_cxl_bars(dev))) + return rc; - if ((rc = cxl_vsec_looks_ok(adapter, dev))) - goto err2; + if ((rc = switch_card_to_cxl(dev))) + return rc; if ((rc = cxl_update_image_control(adapter))) - goto err2; + return rc; if ((rc = cxl_map_adapter_regs(adapter, dev))) - goto err2; + return rc; if ((rc = sanitise_adapter_regs(adapter))) - goto err2; + goto err; if ((rc = init_implementation_adapter_regs(adapter, dev))) - goto err3; + goto err; if ((rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_CAPI))) - goto err3; + goto err; /* If recovery happened, the last step is to turn on snooping. * In the non-recovery case this has no effect */ - if ((rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_SNOOP_ON))) { - goto err3; - } + if ((rc = pnv_phb_to_cxl_mode(dev, OPAL_PHB_CAPI_MODE_SNOOP_ON))) + goto err; + + if ((rc = cxl_setup_psl_timebase(adapter, dev))) + goto err; if ((rc = cxl_register_psl_err_irq(adapter))) - goto err3; + goto err; + + return 0; + +err: + cxl_unmap_adapter_regs(adapter); + return rc; + +} + +static void cxl_deconfigure_adapter(struct cxl *adapter) +{ + struct pci_dev *pdev = to_pci_dev(adapter->dev.parent); + + cxl_release_psl_err_irq(adapter); + cxl_unmap_adapter_regs(adapter); + + pci_disable_device(pdev); +} + +static struct cxl *cxl_init_adapter(struct pci_dev *dev) +{ + struct cxl *adapter; + int rc; + + adapter = cxl_alloc_adapter(); + if (!adapter) + return ERR_PTR(-ENOMEM); + + /* Set defaults for parameters which need to persist over + * configure/reconfigure + */ + adapter->perst_loads_image = true; + adapter->perst_same_image = false; + + rc = cxl_configure_adapter(adapter, dev); + if (rc) { + pci_disable_device(dev); + cxl_release_adapter(&adapter->dev); + return ERR_PTR(rc); + } /* Don't care if this one fails: */ cxl_debugfs_adapter_add(adapter); @@ -1004,37 +1250,25 @@ static struct cxl *cxl_init_adapter(struct pci_dev *dev) return adapter; err_put1: - device_unregister(&adapter->dev); - free = false; + /* This should mirror cxl_remove_adapter, except without the + * sysfs parts + */ cxl_debugfs_adapter_remove(adapter); - cxl_release_psl_err_irq(adapter); -err3: - cxl_unmap_adapter_regs(adapter); -err2: - cxl_remove_adapter_nr(adapter); -err1: - if (free) - kfree(adapter); + cxl_deconfigure_adapter(adapter); + device_unregister(&adapter->dev); return ERR_PTR(rc); } static void cxl_remove_adapter(struct cxl *adapter) { - struct pci_dev *pdev = to_pci_dev(adapter->dev.parent); - - pr_devel("cxl_release_adapter\n"); + pr_devel("cxl_remove_adapter\n"); cxl_sysfs_adapter_remove(adapter); cxl_debugfs_adapter_remove(adapter); - cxl_release_psl_err_irq(adapter); - cxl_unmap_adapter_regs(adapter); - cxl_remove_adapter_nr(adapter); - device_unregister(&adapter->dev); + cxl_deconfigure_adapter(adapter); - pci_release_region(pdev, 0); - pci_release_region(pdev, 2); - pci_disable_device(pdev); + device_unregister(&adapter->dev); } static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id) @@ -1046,14 +1280,6 @@ static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id) if (cxl_verbose) dump_cxl_config_space(dev); - if ((rc = setup_cxl_bars(dev))) - return rc; - - if ((rc = pci_enable_device(dev))) { - dev_err(&dev->dev, "pci_enable_device failed: %i\n", rc); - return rc; - } - adapter = cxl_init_adapter(dev); if (IS_ERR(adapter)) { dev_err(&dev->dev, "cxl_init_adapter failed: %li\n", PTR_ERR(adapter)); @@ -1061,8 +1287,14 @@ static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id) } for (slice = 0; slice < adapter->slices; slice++) { - if ((rc = cxl_init_afu(adapter, slice, dev))) + if ((rc = cxl_init_afu(adapter, slice, dev))) { dev_err(&dev->dev, "AFU %i failed to initialise: %i\n", slice, rc); + continue; + } + + rc = cxl_afu_select_best_mode(adapter->afu[slice]); + if (rc) + dev_err(&dev->dev, "AFU %i failed to start: %i\n", slice, rc); } return 0; @@ -1071,22 +1303,277 @@ static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id) static void cxl_remove(struct pci_dev *dev) { struct cxl *adapter = pci_get_drvdata(dev); - int afu; - - dev_warn(&dev->dev, "pci remove\n"); + struct cxl_afu *afu; + int i; /* * Lock to prevent someone grabbing a ref through the adapter list as * we are removing it */ - for (afu = 0; afu < adapter->slices; afu++) - cxl_remove_afu(adapter->afu[afu]); + for (i = 0; i < adapter->slices; i++) { + afu = adapter->afu[i]; + cxl_pci_vphb_remove(afu); + cxl_remove_afu(afu); + } cxl_remove_adapter(adapter); } +static pci_ers_result_t cxl_vphb_error_detected(struct cxl_afu *afu, + pci_channel_state_t state) +{ + struct pci_dev *afu_dev; + pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET; + pci_ers_result_t afu_result = PCI_ERS_RESULT_NEED_RESET; + + /* There should only be one entry, but go through the list + * anyway + */ + list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { + if (!afu_dev->driver) + continue; + + afu_dev->error_state = state; + + if (afu_dev->driver->err_handler) + afu_result = afu_dev->driver->err_handler->error_detected(afu_dev, + state); + /* Disconnect trumps all, NONE trumps NEED_RESET */ + if (afu_result == PCI_ERS_RESULT_DISCONNECT) + result = PCI_ERS_RESULT_DISCONNECT; + else if ((afu_result == PCI_ERS_RESULT_NONE) && + (result == PCI_ERS_RESULT_NEED_RESET)) + result = PCI_ERS_RESULT_NONE; + } + return result; +} + +static pci_ers_result_t cxl_pci_error_detected(struct pci_dev *pdev, + pci_channel_state_t state) +{ + struct cxl *adapter = pci_get_drvdata(pdev); + struct cxl_afu *afu; + pci_ers_result_t result = PCI_ERS_RESULT_NEED_RESET; + int i; + + /* At this point, we could still have an interrupt pending. + * Let's try to get them out of the way before they do + * anything we don't like. + */ + schedule(); + + /* If we're permanently dead, give up. */ + if (state == pci_channel_io_perm_failure) { + /* Tell the AFU drivers; but we don't care what they + * say, we're going away. + */ + for (i = 0; i < adapter->slices; i++) { + afu = adapter->afu[i]; + cxl_vphb_error_detected(afu, state); + } + return PCI_ERS_RESULT_DISCONNECT; + } + + /* Are we reflashing? + * + * If we reflash, we could come back as something entirely + * different, including a non-CAPI card. As such, by default + * we don't participate in the process. We'll be unbound and + * the slot re-probed. (TODO: check EEH doesn't blindly rebind + * us!) + * + * However, this isn't the entire story: for reliablity + * reasons, we usually want to reflash the FPGA on PERST in + * order to get back to a more reliable known-good state. + * + * This causes us a bit of a problem: if we reflash we can't + * trust that we'll come back the same - we could have a new + * image and been PERSTed in order to load that + * image. However, most of the time we actually *will* come + * back the same - for example a regular EEH event. + * + * Therefore, we allow the user to assert that the image is + * indeed the same and that we should continue on into EEH + * anyway. + */ + if (adapter->perst_loads_image && !adapter->perst_same_image) { + /* TODO take the PHB out of CXL mode */ + dev_info(&pdev->dev, "reflashing, so opting out of EEH!\n"); + return PCI_ERS_RESULT_NONE; + } + + /* + * At this point, we want to try to recover. We'll always + * need a complete slot reset: we don't trust any other reset. + * + * Now, we go through each AFU: + * - We send the driver, if bound, an error_detected callback. + * We expect it to clean up, but it can also tell us to give + * up and permanently detach the card. To simplify things, if + * any bound AFU driver doesn't support EEH, we give up on EEH. + * + * - We detach all contexts associated with the AFU. This + * does not free them, but puts them into a CLOSED state + * which causes any the associated files to return useful + * errors to userland. It also unmaps, but does not free, + * any IRQs. + * + * - We clean up our side: releasing and unmapping resources we hold + * so we can wire them up again when the hardware comes back up. + * + * Driver authors should note: + * + * - Any contexts you create in your kernel driver (except + * those associated with anonymous file descriptors) are + * your responsibility to free and recreate. Likewise with + * any attached resources. + * + * - We will take responsibility for re-initialising the + * device context (the one set up for you in + * cxl_pci_enable_device_hook and accessed through + * cxl_get_context). If you've attached IRQs or other + * resources to it, they remains yours to free. + * + * You can call the same functions to release resources as you + * normally would: we make sure that these functions continue + * to work when the hardware is down. + * + * Two examples: + * + * 1) If you normally free all your resources at the end of + * each request, or if you use anonymous FDs, your + * error_detected callback can simply set a flag to tell + * your driver not to start any new calls. You can then + * clear the flag in the resume callback. + * + * 2) If you normally allocate your resources on startup: + * * Set a flag in error_detected as above. + * * Let CXL detach your contexts. + * * In slot_reset, free the old resources and allocate new ones. + * * In resume, clear the flag to allow things to start. + */ + for (i = 0; i < adapter->slices; i++) { + afu = adapter->afu[i]; + + result = cxl_vphb_error_detected(afu, state); + + /* Only continue if everyone agrees on NEED_RESET */ + if (result != PCI_ERS_RESULT_NEED_RESET) + return result; + + cxl_context_detach_all(afu); + cxl_afu_deactivate_mode(afu); + cxl_deconfigure_afu(afu); + } + cxl_deconfigure_adapter(adapter); + + return result; +} + +static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev) +{ + struct cxl *adapter = pci_get_drvdata(pdev); + struct cxl_afu *afu; + struct cxl_context *ctx; + struct pci_dev *afu_dev; + pci_ers_result_t afu_result = PCI_ERS_RESULT_RECOVERED; + pci_ers_result_t result = PCI_ERS_RESULT_RECOVERED; + int i; + + if (cxl_configure_adapter(adapter, pdev)) + goto err; + + for (i = 0; i < adapter->slices; i++) { + afu = adapter->afu[i]; + + if (cxl_configure_afu(afu, adapter, pdev)) + goto err; + + if (cxl_afu_select_best_mode(afu)) + goto err; + + cxl_pci_vphb_reconfigure(afu); + + list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { + /* Reset the device context. + * TODO: make this less disruptive + */ + ctx = cxl_get_context(afu_dev); + + if (ctx && cxl_release_context(ctx)) + goto err; + + ctx = cxl_dev_context_init(afu_dev); + if (!ctx) + goto err; + + afu_dev->dev.archdata.cxl_ctx = ctx; + + if (cxl_afu_check_and_enable(afu)) + goto err; + + afu_dev->error_state = pci_channel_io_normal; + + /* If there's a driver attached, allow it to + * chime in on recovery. Drivers should check + * if everything has come back OK, but + * shouldn't start new work until we call + * their resume function. + */ + if (!afu_dev->driver) + continue; + + if (afu_dev->driver->err_handler && + afu_dev->driver->err_handler->slot_reset) + afu_result = afu_dev->driver->err_handler->slot_reset(afu_dev); + + if (afu_result == PCI_ERS_RESULT_DISCONNECT) + result = PCI_ERS_RESULT_DISCONNECT; + } + } + return result; + +err: + /* All the bits that happen in both error_detected and cxl_remove + * should be idempotent, so we don't need to worry about leaving a mix + * of unconfigured and reconfigured resources. + */ + dev_err(&pdev->dev, "EEH recovery failed. Asking to be disconnected.\n"); + return PCI_ERS_RESULT_DISCONNECT; +} + +static void cxl_pci_resume(struct pci_dev *pdev) +{ + struct cxl *adapter = pci_get_drvdata(pdev); + struct cxl_afu *afu; + struct pci_dev *afu_dev; + int i; + + /* Everything is back now. Drivers should restart work now. + * This is not the place to be checking if everything came back up + * properly, because there's no return value: do that in slot_reset. + */ + for (i = 0; i < adapter->slices; i++) { + afu = adapter->afu[i]; + + list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) { + if (afu_dev->driver && afu_dev->driver->err_handler && + afu_dev->driver->err_handler->resume) + afu_dev->driver->err_handler->resume(afu_dev); + } + } +} + +static const struct pci_error_handlers cxl_err_handler = { + .error_detected = cxl_pci_error_detected, + .slot_reset = cxl_pci_slot_reset, + .resume = cxl_pci_resume, +}; + struct pci_driver cxl_pci_driver = { .name = "cxl-pci", .id_table = cxl_pci_tbl, .probe = cxl_probe, .remove = cxl_remove, + .shutdown = cxl_remove, + .err_handler = &cxl_err_handler, }; |