f204e0b8ce
This is the core of the cxl driver. It adds support for using cxl cards in the powernv environment only (ie POWER8 bare metal). It allows access to cxl accelerators by userspace using the /dev/cxl/afuM.N char devices. The kernel driver has no knowledge of the function implemented by the accelerator. It provides services to userspace via the /dev/cxl/afuM.N devices. When a program opens this device and runs the start work IOCTL, the accelerator will have coherent access to that processes memory using the same virtual addresses. That process may mmap the device to access any MMIO space the accelerator provides. Also, reads on the device will allow interrupts to be received. These services are further documented in a later patch in Documentation/powerpc/cxl.txt. Documentation of the cxl hardware architecture and userspace API is provided in subsequent patches. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Neuling <mikey@neuling.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
132 lines
3.8 KiB
C
132 lines
3.8 KiB
C
/*
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* Copyright 2014 IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/debugfs.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include "cxl.h"
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static struct dentry *cxl_debugfs;
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void cxl_stop_trace(struct cxl *adapter)
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{
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int slice;
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/* Stop the trace */
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cxl_p1_write(adapter, CXL_PSL_TRACE, 0x8000000000000017LL);
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/* Stop the slice traces */
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spin_lock(&adapter->afu_list_lock);
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for (slice = 0; slice < adapter->slices; slice++) {
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if (adapter->afu[slice])
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cxl_p1n_write(adapter->afu[slice], CXL_PSL_SLICE_TRACE, 0x8000000000000000LL);
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}
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spin_unlock(&adapter->afu_list_lock);
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}
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/* Helpers to export CXL mmaped IO registers via debugfs */
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static int debugfs_io_u64_get(void *data, u64 *val)
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{
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*val = in_be64((u64 __iomem *)data);
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return 0;
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}
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static int debugfs_io_u64_set(void *data, u64 val)
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{
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out_be64((u64 __iomem *)data, val);
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(fops_io_x64, debugfs_io_u64_get, debugfs_io_u64_set, "0x%016llx\n");
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static struct dentry *debugfs_create_io_x64(const char *name, umode_t mode,
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struct dentry *parent, u64 __iomem *value)
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{
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return debugfs_create_file(name, mode, parent, (void *)value, &fops_io_x64);
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}
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int cxl_debugfs_adapter_add(struct cxl *adapter)
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{
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struct dentry *dir;
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char buf[32];
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if (!cxl_debugfs)
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return -ENODEV;
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snprintf(buf, 32, "card%i", adapter->adapter_num);
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dir = debugfs_create_dir(buf, cxl_debugfs);
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if (IS_ERR(dir))
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return PTR_ERR(dir);
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adapter->debugfs = dir;
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debugfs_create_io_x64("fir1", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR1));
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debugfs_create_io_x64("fir2", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR2));
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debugfs_create_io_x64("fir_cntl", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_FIR_CNTL));
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debugfs_create_io_x64("err_ivte", S_IRUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_ErrIVTE));
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debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1_addr(adapter, CXL_PSL_TRACE));
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return 0;
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}
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void cxl_debugfs_adapter_remove(struct cxl *adapter)
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{
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debugfs_remove_recursive(adapter->debugfs);
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}
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int cxl_debugfs_afu_add(struct cxl_afu *afu)
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{
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struct dentry *dir;
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char buf[32];
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if (!afu->adapter->debugfs)
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return -ENODEV;
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snprintf(buf, 32, "psl%i.%i", afu->adapter->adapter_num, afu->slice);
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dir = debugfs_create_dir(buf, afu->adapter->debugfs);
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if (IS_ERR(dir))
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return PTR_ERR(dir);
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afu->debugfs = dir;
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debugfs_create_io_x64("fir", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_FIR_SLICE_An));
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debugfs_create_io_x64("serr", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SERR_An));
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debugfs_create_io_x64("afu_debug", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_AFU_DEBUG_An));
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debugfs_create_io_x64("sr", S_IRUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SR_An));
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debugfs_create_io_x64("dsisr", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DSISR_An));
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debugfs_create_io_x64("dar", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_DAR_An));
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debugfs_create_io_x64("sstp0", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP0_An));
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debugfs_create_io_x64("sstp1", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_SSTP1_An));
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debugfs_create_io_x64("err_status", S_IRUSR, dir, _cxl_p2n_addr(afu, CXL_PSL_ErrStat_An));
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debugfs_create_io_x64("trace", S_IRUSR | S_IWUSR, dir, _cxl_p1n_addr(afu, CXL_PSL_SLICE_TRACE));
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return 0;
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}
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void cxl_debugfs_afu_remove(struct cxl_afu *afu)
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{
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debugfs_remove_recursive(afu->debugfs);
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}
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int __init cxl_debugfs_init(void)
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{
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struct dentry *ent;
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ent = debugfs_create_dir("cxl", NULL);
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if (IS_ERR(ent))
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return PTR_ERR(ent);
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cxl_debugfs = ent;
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return 0;
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}
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void cxl_debugfs_exit(void)
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{
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debugfs_remove_recursive(cxl_debugfs);
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}
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