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90eb10774f
open-gpu-kernel-modules/kernel-open/nvidia/nv-pci.c
Andy Ritger 90eb10774f
520.61.05
2022-10-10 14:59:24 -07:00

1028 lines
31 KiB
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/*
* SPDX-FileCopyrightText: Copyright (c) 2019-2021 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include "nv-pci-table.h"
#include "nv-pci-types.h"
#include "nv-pci.h"
#include "nv-ibmnpu.h"
#include "nv-frontend.h"
#include "nv-msi.h"
#include "nv-hypervisor.h"
#if defined(NV_VGPU_KVM_BUILD)
#include "nv-vgpu-vfio-interface.h"
#endif
#if defined(NV_SEQ_READ_ITER_PRESENT)
#include <linux/seq_file.h>
#include <linux/kernfs.h>
#endif
static void
nv_check_and_exclude_gpu(
nvidia_stack_t *sp,
nv_state_t *nv
)
{
char *uuid_str;
uuid_str = rm_get_gpu_uuid(sp, nv);
if (uuid_str == NULL)
{
NV_DEV_PRINTF(NV_DBG_INFO, nv, "Unable to read UUID");
return;
}
if (nv_is_uuid_in_gpu_exclusion_list(uuid_str))
{
NV_STATUS rm_status = rm_exclude_adapter(sp, nv);
if (rm_status != NV_OK)
{
NV_DEV_PRINTF_STATUS(NV_DBG_ERRORS, nv, rm_status,
"Failed to exclude GPU %s", uuid_str);
goto done;
}
nv->flags |= NV_FLAG_EXCLUDE;
NV_DEV_PRINTF(NV_DBG_INFO, nv, "Excluded GPU %s successfully\n",
uuid_str);
}
done:
os_free_mem(uuid_str);
}
static NvBool nv_treat_missing_irq_as_error(void)
{
#if defined(NV_LINUX_PCIE_MSI_SUPPORTED)
return (nv_get_hypervisor_type() != OS_HYPERVISOR_HYPERV);
#else
return NV_TRUE;
#endif
}
static void nv_init_dynamic_power_management
(
nvidia_stack_t *sp,
struct pci_dev *pci_dev
)
{
nv_linux_state_t *nvl = pci_get_drvdata(pci_dev);
nv_state_t *nv = NV_STATE_PTR(nvl);
char filename[50];
int ret;
NvBool pr3_acpi_method_present = NV_FALSE;
nvl->sysfs_config_file = NULL;
ret = snprintf(filename, sizeof(filename),
"/sys/bus/pci/devices/%04x:%02x:%02x.0/config",
NV_PCI_DOMAIN_NUMBER(pci_dev),
NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev));
if (ret > 0 && ret < sizeof(filename))
{
struct file *file = filp_open(filename, O_RDONLY, 0);
if (!IS_ERR(file))
{
#if defined(NV_SEQ_READ_ITER_PRESENT)
/*
* Sanity check for confirming if file path is mounted over
* sysfs file system.
*/
if ((file->f_inode != NULL) && (file->f_inode->i_sb != NULL) &&
(strcmp(file->f_inode->i_sb->s_id, "sysfs") == 0))
{
struct seq_file *sf = file->private_data;
/*
* Sanity check for confirming if 'file->private_data'
* actually points to 'struct seq_file'.
*/
if ((sf != NULL) && (sf->file == file) && (sf->op == NULL))
{
struct kernfs_open_file *of = sf->private;
/*
* Sanity check for confirming if 'sf->private'
* actually points to 'struct kernfs_open_file'.
*/
if ((of != NULL) && (of->file == file) &&
(of->seq_file == sf))
{
nvl->sysfs_config_file = file;
}
}
}
if (nvl->sysfs_config_file == NULL)
{
filp_close(file, NULL);
}
#else
nvl->sysfs_config_file = file;
#endif
}
}
if (nv_get_hypervisor_type() != OS_HYPERVISOR_UNKNOWN)
{
pr3_acpi_method_present = nv_acpi_power_resource_method_present(pci_dev);
}
else if (pci_dev->bus && pci_dev->bus->self)
{
pr3_acpi_method_present = nv_acpi_power_resource_method_present(pci_dev->bus->self);
}
rm_init_dynamic_power_management(sp, nv, pr3_acpi_method_present);
}
/* find nvidia devices and set initial state */
static int
nv_pci_probe
(
struct pci_dev *pci_dev,
const struct pci_device_id *id_table
)
{
nv_state_t *nv = NULL;
nv_linux_state_t *nvl = NULL;
unsigned int i, j;
int flags = 0;
nvidia_stack_t *sp = NULL;
NvBool prev_nv_ats_supported = nv_ats_supported;
NV_STATUS status;
NvBool last_bar_64bit = NV_FALSE;
nv_printf(NV_DBG_SETUP, "NVRM: probing 0x%x 0x%x, class 0x%x\n",
pci_dev->vendor, pci_dev->device, pci_dev->class);
if (nv_kmem_cache_alloc_stack(&sp) != 0)
{
return -1;
}
#ifdef NV_PCI_SRIOV_SUPPORT
if (pci_dev->is_virtfn)
{
#if defined(NV_VGPU_KVM_BUILD)
nvl = pci_get_drvdata(pci_dev->physfn);
if (!nvl)
{
nv_printf(NV_DBG_ERRORS, "NVRM: Aborting probe for VF %04x:%02x:%02x.%x "
"since PF is not bound to nvidia driver.\n",
NV_PCI_DOMAIN_NUMBER(pci_dev), NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev), PCI_FUNC(pci_dev->devfn));
goto failed;
}
if (pci_dev->dev.bus->iommu_ops == NULL)
{
nv = NV_STATE_PTR(nvl);
if (rm_is_iommu_needed_for_sriov(sp, nv))
{
nv_printf(NV_DBG_ERRORS, "NVRM: Aborting probe for VF %04x:%02x:%02x.%x "
"since IOMMU is not present on the system.\n",
NV_PCI_DOMAIN_NUMBER(pci_dev), NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev), PCI_FUNC(pci_dev->devfn));
goto failed;
}
}
if (nvidia_vgpu_vfio_probe(pci_dev) != NV_OK)
{
nv_printf(NV_DBG_ERRORS, "NVRM: Failed to register device to vGPU VFIO module");
goto failed;
}
nv_kmem_cache_free_stack(sp);
return 0;
#else
nv_printf(NV_DBG_ERRORS, "NVRM: Ignoring probe for VF %04x:%02x:%02x.%x ",
NV_PCI_DOMAIN_NUMBER(pci_dev), NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev), PCI_FUNC(pci_dev->devfn));
goto failed;
#endif /* NV_VGPU_KVM_BUILD */
}
#endif /* NV_PCI_SRIOV_SUPPORT */
if (!rm_is_supported_pci_device(
(pci_dev->class >> 16) & 0xFF,
(pci_dev->class >> 8) & 0xFF,
pci_dev->vendor,
pci_dev->device,
pci_dev->subsystem_vendor,
pci_dev->subsystem_device,
NV_FALSE /* print_legacy_warning */))
{
nv_printf(NV_DBG_ERRORS, "NVRM: ignoring the legacy GPU %04x:%02x:%02x.%x\n",
NV_PCI_DOMAIN_NUMBER(pci_dev), NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev), PCI_FUNC(pci_dev->devfn));
goto failed;
}
num_probed_nv_devices++;
if (pci_enable_device(pci_dev) != 0)
{
nv_printf(NV_DBG_ERRORS,
"NVRM: pci_enable_device failed, aborting\n");
goto failed;
}
if ((pci_dev->irq == 0 && !pci_find_capability(pci_dev, PCI_CAP_ID_MSIX))
&& nv_treat_missing_irq_as_error())
{
nv_printf(NV_DBG_ERRORS, "NVRM: Can't find an IRQ for your NVIDIA card!\n");
nv_printf(NV_DBG_ERRORS, "NVRM: Please check your BIOS settings.\n");
nv_printf(NV_DBG_ERRORS, "NVRM: [Plug & Play OS] should be set to NO\n");
nv_printf(NV_DBG_ERRORS, "NVRM: [Assign IRQ to VGA] should be set to YES \n");
goto failed;
}
for (i = 0, j = 0; i < NVRM_PCICFG_NUM_BARS && j < NV_GPU_NUM_BARS; i++)
{
if (NV_PCI_RESOURCE_VALID(pci_dev, i))
{
#if defined(NV_PCI_MAX_MMIO_BITS_SUPPORTED)
if ((NV_PCI_RESOURCE_FLAGS(pci_dev, i) & PCI_BASE_ADDRESS_MEM_TYPE_64) &&
((NV_PCI_RESOURCE_START(pci_dev, i) >> NV_PCI_MAX_MMIO_BITS_SUPPORTED)))
{
nv_printf(NV_DBG_ERRORS,
"NVRM: This is a 64-bit BAR mapped above %dGB by the system\n"
"NVRM: BIOS or the %s kernel. This PCI I/O region assigned\n"
"NVRM: to your NVIDIA device is not supported by the kernel.\n"
"NVRM: BAR%d is %dM @ 0x%llx (PCI:%04x:%02x:%02x.%x)\n",
(1 << (NV_PCI_MAX_MMIO_BITS_SUPPORTED - 30)),
NV_KERNEL_NAME, i,
(NV_PCI_RESOURCE_SIZE(pci_dev, i) >> 20),
(NvU64)NV_PCI_RESOURCE_START(pci_dev, i),
NV_PCI_DOMAIN_NUMBER(pci_dev),
NV_PCI_BUS_NUMBER(pci_dev), NV_PCI_SLOT_NUMBER(pci_dev),
PCI_FUNC(pci_dev->devfn));
goto failed;
}
#endif
if ((NV_PCI_RESOURCE_FLAGS(pci_dev, i) & PCI_BASE_ADDRESS_MEM_TYPE_64) &&
(NV_PCI_RESOURCE_FLAGS(pci_dev, i) & PCI_BASE_ADDRESS_MEM_PREFETCH))
{
struct pci_dev *bridge = pci_dev->bus->self;
NvU32 base_upper, limit_upper;
last_bar_64bit = NV_TRUE;
if (bridge == NULL)
goto next_bar;
pci_read_config_dword(pci_dev, NVRM_PCICFG_BAR_OFFSET(i) + 4,
&base_upper);
if (base_upper == 0)
goto next_bar;
pci_read_config_dword(bridge, PCI_PREF_BASE_UPPER32,
&base_upper);
pci_read_config_dword(bridge, PCI_PREF_LIMIT_UPPER32,
&limit_upper);
if ((base_upper != 0) && (limit_upper != 0))
goto next_bar;
nv_printf(NV_DBG_ERRORS,
"NVRM: This is a 64-bit BAR mapped above 4GB by the system\n"
"NVRM: BIOS or the %s kernel, but the PCI bridge\n"
"NVRM: immediately upstream of this GPU does not define\n"
"NVRM: a matching prefetchable memory window.\n",
NV_KERNEL_NAME);
nv_printf(NV_DBG_ERRORS,
"NVRM: This may be due to a known Linux kernel bug. Please\n"
"NVRM: see the README section on 64-bit BARs for additional\n"
"NVRM: information.\n");
goto failed;
}
next_bar:
//
// If we are here, then we have found a valid BAR -- 32 or 64-bit.
//
j++;
continue;
}
//
// If last_bar_64bit is "true" then, we are looking at the 2nd (upper)
// half of the 64-bit BAR. This is typically all 0s which looks invalid
// but it's normal and not a problem and we can ignore it and continue.
//
if (last_bar_64bit)
{
last_bar_64bit = NV_FALSE;
continue;
}
// Invalid 32 or 64-bit BAR.
nv_printf(NV_DBG_ERRORS,
"NVRM: This PCI I/O region assigned to your NVIDIA device is invalid:\n"
"NVRM: BAR%d is %dM @ 0x%llx (PCI:%04x:%02x:%02x.%x)\n", i,
(NV_PCI_RESOURCE_SIZE(pci_dev, i) >> 20),
(NvU64)NV_PCI_RESOURCE_START(pci_dev, i),
NV_PCI_DOMAIN_NUMBER(pci_dev), NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev), PCI_FUNC(pci_dev->devfn));
goto failed;
}
if (!request_mem_region(NV_PCI_RESOURCE_START(pci_dev, NV_GPU_BAR_INDEX_REGS),
NV_PCI_RESOURCE_SIZE(pci_dev, NV_GPU_BAR_INDEX_REGS),
nv_device_name))
{
nv_printf(NV_DBG_ERRORS,
"NVRM: request_mem_region failed for %dM @ 0x%llx. This can\n"
"NVRM: occur when a driver such as rivatv is loaded and claims\n"
"NVRM: ownership of the device's registers.\n",
(NV_PCI_RESOURCE_SIZE(pci_dev, NV_GPU_BAR_INDEX_REGS) >> 20),
(NvU64)NV_PCI_RESOURCE_START(pci_dev, NV_GPU_BAR_INDEX_REGS));
goto failed;
}
NV_KMALLOC(nvl, sizeof(nv_linux_state_t));
if (nvl == NULL)
{
nv_printf(NV_DBG_ERRORS, "NVRM: failed to allocate memory\n");
goto err_not_supported;
}
os_mem_set(nvl, 0, sizeof(nv_linux_state_t));
nv = NV_STATE_PTR(nvl);
pci_set_drvdata(pci_dev, (void *)nvl);
/* default to 32-bit PCI bus address space */
pci_dev->dma_mask = 0xffffffffULL;
nvl->dev = &pci_dev->dev;
nvl->pci_dev = pci_dev;
nvl->dma_dev.dev = nvl->dev;
nv->pci_info.vendor_id = pci_dev->vendor;
nv->pci_info.device_id = pci_dev->device;
nv->subsystem_id = pci_dev->subsystem_device;
nv->subsystem_vendor = pci_dev->subsystem_vendor;
nv->os_state = (void *) nvl;
nv->dma_dev = &nvl->dma_dev;
nv->pci_info.domain = NV_PCI_DOMAIN_NUMBER(pci_dev);
nv->pci_info.bus = NV_PCI_BUS_NUMBER(pci_dev);
nv->pci_info.slot = NV_PCI_SLOT_NUMBER(pci_dev);
nv->handle = pci_dev;
nv->flags |= flags;
if (!nv_lock_init_locks(sp, nv))
{
goto err_not_supported;
}
nvl->all_mappings_revoked = NV_TRUE;
nvl->safe_to_mmap = NV_TRUE;
nvl->gpu_wakeup_callback_needed = NV_TRUE;
INIT_LIST_HEAD(&nvl->open_files);
for (i = 0, j = 0; i < NVRM_PCICFG_NUM_BARS && j < NV_GPU_NUM_BARS; i++)
{
if ((NV_PCI_RESOURCE_VALID(pci_dev, i)) &&
(NV_PCI_RESOURCE_FLAGS(pci_dev, i) & PCI_BASE_ADDRESS_SPACE)
== PCI_BASE_ADDRESS_SPACE_MEMORY)
{
nv->bars[j].offset = NVRM_PCICFG_BAR_OFFSET(i);
nv->bars[j].cpu_address = NV_PCI_RESOURCE_START(pci_dev, i);
nv->bars[j].size = NV_PCI_RESOURCE_SIZE(pci_dev, i);
j++;
}
}
nv->regs = &nv->bars[NV_GPU_BAR_INDEX_REGS];
nv->fb = &nv->bars[NV_GPU_BAR_INDEX_FB];
nv->interrupt_line = pci_dev->irq;
NV_ATOMIC_SET(nvl->numa_info.status, NV_IOCTL_NUMA_STATUS_DISABLED);
nvl->numa_info.node_id = NUMA_NO_NODE;
nv_init_ibmnpu_info(nv);
#if defined(NVCPU_PPC64LE)
// Use HW NUMA support as a proxy for ATS support. This is true in the only
// PPC64LE platform where ATS is currently supported (IBM P9).
nv_ats_supported &= nv_platform_supports_numa(nvl);
#else
#endif
if (nv_ats_supported)
{
NV_DEV_PRINTF(NV_DBG_INFO, nv, "ATS supported by this GPU!\n");
}
else
{
NV_DEV_PRINTF(NV_DBG_INFO, nv, "ATS not supported by this GPU. "
"Disabling ATS support for all the GPUs in the system!\n");
}
pci_set_master(pci_dev);
#if defined(CONFIG_VGA_ARB) && !defined(NVCPU_PPC64LE)
#if defined(VGA_DEFAULT_DEVICE)
#if defined(NV_VGA_TRYGET_PRESENT)
vga_tryget(VGA_DEFAULT_DEVICE, VGA_RSRC_LEGACY_MASK);
#endif
#endif
vga_set_legacy_decoding(pci_dev, VGA_RSRC_NONE);
#endif
status = nv_check_gpu_state(nv);
if (status == NV_ERR_GPU_IS_LOST)
{
NV_DEV_PRINTF(NV_DBG_INFO, nv, "GPU is lost, skipping nv_pci_probe\n");
goto err_not_supported;
}
if ((rm_is_supported_device(sp, nv)) != NV_OK)
goto err_not_supported;
if (!rm_init_private_state(sp, nv))
{
NV_DEV_PRINTF(NV_DBG_ERRORS, nv, "rm_init_private_state() failed!\n");
goto err_zero_dev;
}
nv_printf(NV_DBG_INFO,
"NVRM: PCI:%04x:%02x:%02x.%x (%04x:%04x): BAR0 @ 0x%llx (%lluMB)\n",
nv->pci_info.domain, nv->pci_info.bus, nv->pci_info.slot,
PCI_FUNC(pci_dev->devfn), nv->pci_info.vendor_id, nv->pci_info.device_id,
nv->regs->cpu_address, (nv->regs->size >> 20));
nv_printf(NV_DBG_INFO,
"NVRM: PCI:%04x:%02x:%02x.%x (%04x:%04x): BAR1 @ 0x%llx (%lluMB)\n",
nv->pci_info.domain, nv->pci_info.bus, nv->pci_info.slot,
PCI_FUNC(pci_dev->devfn), nv->pci_info.vendor_id, nv->pci_info.device_id,
nv->fb->cpu_address, (nv->fb->size >> 20));
num_nv_devices++;
/*
* The newly created nvl object is added to the nv_linux_devices global list
* only after all the initialization operations for that nvl object are
* completed, so as to protect against simultaneous lookup operations which
* may discover a partially initialized nvl object in the list
*/
LOCK_NV_LINUX_DEVICES();
nv_linux_add_device_locked(nvl);
UNLOCK_NV_LINUX_DEVICES();
if (nvidia_frontend_add_device((void *)&nv_fops, nvl) != 0)
goto err_remove_device;
#if defined(NV_PM_VT_SWITCH_REQUIRED_PRESENT)
pm_vt_switch_required(nvl->dev, NV_TRUE);
#endif
nv_init_dynamic_power_management(sp, pci_dev);
nv_procfs_add_gpu(nvl);
/* Parse and set any per-GPU registry keys specified. */
nv_parse_per_device_option_string(sp);
rm_set_rm_firmware_requested(sp, nv);
#if defined(NV_VGPU_KVM_BUILD)
if (nvidia_vgpu_vfio_probe(nvl->pci_dev) != NV_OK)
{
NV_DEV_PRINTF(NV_DBG_ERRORS, nv, "Failed to register device to vGPU VFIO module");
nvidia_frontend_remove_device((void *)&nv_fops, nvl);
goto err_vgpu_kvm;
}
#endif
nv_check_and_exclude_gpu(sp, nv);
#if defined(DPM_FLAG_NO_DIRECT_COMPLETE)
dev_pm_set_driver_flags(nvl->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
#elif defined(DPM_FLAG_NEVER_SKIP)
dev_pm_set_driver_flags(nvl->dev, DPM_FLAG_NEVER_SKIP);
#endif
/*
* Dynamic power management should be enabled as the last step.
* Kernel runtime power management framework can put the device
* into the suspended state. Hardware register access should not be done
* after enabling dynamic power management.
*/
rm_enable_dynamic_power_management(sp, nv);
nv_kmem_cache_free_stack(sp);
return 0;
#if defined(NV_VGPU_KVM_BUILD)
err_vgpu_kvm:
#endif
nv_procfs_remove_gpu(nvl);
rm_cleanup_dynamic_power_management(sp, nv);
#if defined(NV_PM_VT_SWITCH_REQUIRED_PRESENT)
pm_vt_switch_unregister(nvl->dev);
#endif
err_remove_device:
LOCK_NV_LINUX_DEVICES();
nv_linux_remove_device_locked(nvl);
UNLOCK_NV_LINUX_DEVICES();
err_zero_dev:
rm_free_private_state(sp, nv);
err_not_supported:
nv_ats_supported = prev_nv_ats_supported;
nv_destroy_ibmnpu_info(nv);
nv_lock_destroy_locks(sp, nv);
if (nvl != NULL)
{
NV_KFREE(nvl, sizeof(nv_linux_state_t));
}
release_mem_region(NV_PCI_RESOURCE_START(pci_dev, NV_GPU_BAR_INDEX_REGS),
NV_PCI_RESOURCE_SIZE(pci_dev, NV_GPU_BAR_INDEX_REGS));
NV_PCI_DISABLE_DEVICE(pci_dev);
pci_set_drvdata(pci_dev, NULL);
failed:
nv_kmem_cache_free_stack(sp);
return -1;
}
static void
nv_pci_remove(struct pci_dev *pci_dev)
{
nv_linux_state_t *nvl = NULL;
nv_state_t *nv;
nvidia_stack_t *sp = NULL;
nv_printf(NV_DBG_SETUP, "NVRM: removing GPU %04x:%02x:%02x.%x\n",
NV_PCI_DOMAIN_NUMBER(pci_dev), NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev), PCI_FUNC(pci_dev->devfn));
#ifdef NV_PCI_SRIOV_SUPPORT
if (pci_dev->is_virtfn)
{
#if defined(NV_VGPU_KVM_BUILD)
/* Arg 2 == NV_TRUE means that the PCI device should be removed */
nvidia_vgpu_vfio_remove(pci_dev, NV_TRUE);
#endif /* NV_VGPU_KVM_BUILD */
return;
}
#endif /* NV_PCI_SRIOV_SUPPORT */
if (nv_kmem_cache_alloc_stack(&sp) != 0)
{
return;
}
LOCK_NV_LINUX_DEVICES();
nvl = pci_get_drvdata(pci_dev);
if (!nvl || (nvl->pci_dev != pci_dev))
{
goto done;
}
nv = NV_STATE_PTR(nvl);
down(&nvl->ldata_lock);
/*
* Sanity check: A removed device shouldn't have a non-zero usage_count.
* For eGPU, fall off the bus along with clients active is a valid scenario.
* Hence skipping the sanity check for eGPU.
*/
if ((NV_ATOMIC_READ(nvl->usage_count) != 0) && !(nv->is_external_gpu))
{
nv_printf(NV_DBG_ERRORS,
"NVRM: Attempting to remove device %04x:%02x:%02x.%x with non-zero usage count!\n",
NV_PCI_DOMAIN_NUMBER(pci_dev), NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev), PCI_FUNC(pci_dev->devfn));
/*
* We can't return from this function without corrupting state, so we wait for
* the usage count to go to zero.
*/
while (NV_ATOMIC_READ(nvl->usage_count) != 0)
{
/*
* While waiting, release the locks so that other threads can make
* forward progress.
*/
up(&nvl->ldata_lock);
UNLOCK_NV_LINUX_DEVICES();
os_delay(500);
/* Re-acquire the locks before checking again */
LOCK_NV_LINUX_DEVICES();
nvl = pci_get_drvdata(pci_dev);
if (!nvl)
{
/* The device was not found, which should not happen */
nv_printf(NV_DBG_ERRORS,
"NVRM: Failed removal of device %04x:%02x:%02x.%x!\n",
NV_PCI_DOMAIN_NUMBER(pci_dev), NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev), PCI_FUNC(pci_dev->devfn));
WARN_ON(1);
goto done;
}
nv = NV_STATE_PTR(nvl);
down(&nvl->ldata_lock);
}
nv_printf(NV_DBG_ERRORS,
"NVRM: Continuing with GPU removal for device %04x:%02x:%02x.%x\n",
NV_PCI_DOMAIN_NUMBER(pci_dev), NV_PCI_BUS_NUMBER(pci_dev),
NV_PCI_SLOT_NUMBER(pci_dev), PCI_FUNC(pci_dev->devfn));
}
rm_check_for_gpu_surprise_removal(sp, nv);
nv_linux_remove_device_locked(nvl);
/* Remove proc entry for this GPU */
nv_procfs_remove_gpu(nvl);
rm_cleanup_dynamic_power_management(sp, nv);
nv->removed = NV_TRUE;
UNLOCK_NV_LINUX_DEVICES();
#if defined(NV_PM_VT_SWITCH_REQUIRED_PRESENT)
pm_vt_switch_unregister(&pci_dev->dev);
#endif
#if defined(NV_VGPU_KVM_BUILD)
/* Arg 2 == NV_TRUE means that the PCI device should be removed */
nvidia_vgpu_vfio_remove(pci_dev, NV_TRUE);
#endif
/* Update the frontend data structures */
if (NV_ATOMIC_READ(nvl->usage_count) == 0)
{
nvidia_frontend_remove_device((void *)&nv_fops, nvl);
}
if ((nv->flags & NV_FLAG_PERSISTENT_SW_STATE) || (nv->flags & NV_FLAG_OPEN))
{
nv_acpi_unregister_notifier(nvl);
if (nv->flags & NV_FLAG_PERSISTENT_SW_STATE)
{
rm_disable_gpu_state_persistence(sp, nv);
}
nv_shutdown_adapter(sp, nv, nvl);
nv_dev_free_stacks(nvl);
}
if (nvl->sysfs_config_file != NULL)
{
filp_close(nvl->sysfs_config_file, NULL);
nvl->sysfs_config_file = NULL;
}
nv_unregister_ibmnpu_devices(nv);
nv_destroy_ibmnpu_info(nv);
if (NV_ATOMIC_READ(nvl->usage_count) == 0)
{
nv_lock_destroy_locks(sp, nv);
}
num_probed_nv_devices--;
pci_set_drvdata(pci_dev, NULL);
rm_i2c_remove_adapters(sp, nv);
rm_free_private_state(sp, nv);
release_mem_region(NV_PCI_RESOURCE_START(pci_dev, NV_GPU_BAR_INDEX_REGS),
NV_PCI_RESOURCE_SIZE(pci_dev, NV_GPU_BAR_INDEX_REGS));
num_nv_devices--;
if (NV_ATOMIC_READ(nvl->usage_count) == 0)
{
NV_PCI_DISABLE_DEVICE(pci_dev);
NV_KFREE(nvl, sizeof(nv_linux_state_t));
}
else
{
up(&nvl->ldata_lock);
}
nv_kmem_cache_free_stack(sp);
return;
done:
UNLOCK_NV_LINUX_DEVICES();
nv_kmem_cache_free_stack(sp);
}
static void
nv_pci_shutdown(struct pci_dev *pci_dev)
{
nv_linux_state_t *nvl = pci_get_drvdata(pci_dev);
if ((nvl != NULL) && nvl->is_forced_shutdown)
{
nvl->is_forced_shutdown = NV_FALSE;
return;
}
/* pci_clear_master is not defined for !CONFIG_PCI */
#ifdef CONFIG_PCI
pci_clear_master(pci_dev);
#endif
/* SHH HW mandates 1us delay to realise the effects of
* Bus Mater Enable(BME) disable. Adding 1us delay for
* all the chips as the delay is not in the data path
* and not big. Creating HAL for this would be a overkill.
*/
udelay(1);
}
/*!
* @brief This function accepts pci information corresponding to a GPU
* and returns a reference to the nv_linux_state_t corresponding to that GPU.
*
* @param[in] domain Pci domain number for the GPU to be found.
* @param[in] bus Pci bus number for the GPU to be found.
* @param[in] slot Pci slot number for the GPU to be found.
* @param[in] function Pci function number for the GPU to be found.
*
* @return Pointer to nv_linux_state_t for the GPU if it is found, or NULL otherwise.
*/
nv_linux_state_t * find_pci(NvU32 domain, NvU8 bus, NvU8 slot, NvU8 function)
{
nv_linux_state_t *nvl = NULL;
LOCK_NV_LINUX_DEVICES();
for (nvl = nv_linux_devices; nvl != NULL; nvl = nvl->next)
{
nv_state_t *nv = NV_STATE_PTR(nvl);
if (nv->pci_info.domain == domain &&
nv->pci_info.bus == bus &&
nv->pci_info.slot == slot &&
nv->pci_info.function == function)
{
break;
}
}
UNLOCK_NV_LINUX_DEVICES();
return nvl;
}
int nvidia_dev_get_pci_info(const NvU8 *uuid, struct pci_dev **pci_dev_out,
NvU64 *dma_start, NvU64 *dma_limit)
{
nv_linux_state_t *nvl;
/* Takes nvl->ldata_lock */
nvl = find_uuid(uuid);
if (!nvl)
return -ENODEV;
*pci_dev_out = nvl->pci_dev;
*dma_start = nvl->dma_dev.addressable_range.start;
*dma_limit = nvl->dma_dev.addressable_range.limit;
up(&nvl->ldata_lock);
return 0;
}
NvU8 nv_find_pci_capability(struct pci_dev *pci_dev, NvU8 capability)
{
u16 status = 0;
u8 cap_ptr = 0, cap_id = 0xff;
pci_read_config_word(pci_dev, PCI_STATUS, &status);
status &= PCI_STATUS_CAP_LIST;
if (!status)
return 0;
switch (pci_dev->hdr_type) {
case PCI_HEADER_TYPE_NORMAL:
case PCI_HEADER_TYPE_BRIDGE:
pci_read_config_byte(pci_dev, PCI_CAPABILITY_LIST, &cap_ptr);
break;
default:
return 0;
}
do {
cap_ptr &= 0xfc;
pci_read_config_byte(pci_dev, cap_ptr + PCI_CAP_LIST_ID, &cap_id);
if (cap_id == capability)
return cap_ptr;
pci_read_config_byte(pci_dev, cap_ptr + PCI_CAP_LIST_NEXT, &cap_ptr);
} while (cap_ptr && cap_id != 0xff);
return 0;
}
/* make sure the pci_driver called probe for all of our devices.
* we've seen cases where rivafb claims the device first and our driver
* doesn't get called.
*/
int
nv_pci_count_devices(void)
{
struct pci_dev *pci_dev;
int count = 0;
if (NVreg_RegisterPCIDriver == 0)
{
return 0;
}
pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, NULL);
while (pci_dev)
{
if (rm_is_supported_pci_device(
PCI_BASE_CLASS_DISPLAY,
PCI_CLASS_DISPLAY_VGA & 0xFF,
pci_dev->vendor,
pci_dev->device,
pci_dev->subsystem_vendor,
pci_dev->subsystem_device,
NV_TRUE /* print_legacy_warning */))
{
count++;
}
pci_dev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pci_dev);
}
pci_dev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, NULL);
while (pci_dev)
{
if (rm_is_supported_pci_device(
(pci_dev->class >> 16) & 0xFF,
(pci_dev->class >> 8) & 0xFF,
pci_dev->vendor,
pci_dev->device,
pci_dev->subsystem_vendor,
pci_dev->subsystem_device,
NV_TRUE /* print_legacy_warning */))
{
count++;
}
pci_dev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pci_dev);
}
return count;
}
#if defined(NV_PCI_ERROR_RECOVERY)
static pci_ers_result_t
nv_pci_error_detected(
struct pci_dev *pci_dev,
nv_pci_channel_state_t error
)
{
nv_linux_state_t *nvl = pci_get_drvdata(pci_dev);
if ((nvl == NULL) || (nvl->pci_dev != pci_dev))
{
nv_printf(NV_DBG_ERRORS, "NVRM: %s: invalid device!\n", __FUNCTION__);
return PCI_ERS_RESULT_NONE;
}
/*
* Tell Linux to continue recovery of the device. The kernel will enable
* MMIO for the GPU and call the mmio_enabled callback.
*/
return PCI_ERS_RESULT_CAN_RECOVER;
}
static pci_ers_result_t
nv_pci_mmio_enabled(
struct pci_dev *pci_dev
)
{
NV_STATUS status = NV_OK;
nv_stack_t *sp = NULL;
nv_linux_state_t *nvl = pci_get_drvdata(pci_dev);
nv_state_t *nv = NULL;
if ((nvl == NULL) || (nvl->pci_dev != pci_dev))
{
nv_printf(NV_DBG_ERRORS, "NVRM: %s: invalid device!\n", __FUNCTION__);
goto done;
}
nv = NV_STATE_PTR(nvl);
if (nv_kmem_cache_alloc_stack(&sp) != 0)
{
nv_printf(NV_DBG_ERRORS, "NVRM: %s: failed to allocate stack!\n",
__FUNCTION__);
goto done;
}
NV_DEV_PRINTF(NV_DBG_ERRORS, nv, "A fatal error was detected.\n");
/*
* MMIO should be re-enabled now. If we still get bad reads, there's
* likely something wrong with the adapter itself that will require a
* reset. This should let us know whether the GPU has completely fallen
* off the bus or just did something the host didn't like.
*/
status = rm_is_supported_device(sp, nv);
if (status != NV_OK)
{
NV_DEV_PRINTF(NV_DBG_ERRORS, nv,
"The kernel has enabled MMIO for the device,\n"
"NVRM: but it still appears unreachable. The device\n"
"NVRM: will not function properly until it is reset.\n");
}
status = rm_log_gpu_crash(sp, nv);
if (status != NV_OK)
{
NV_DEV_PRINTF_STATUS(NV_DBG_ERRORS, nv, status,
"Failed to log crash data\n");
goto done;
}
done:
if (sp != NULL)
{
nv_kmem_cache_free_stack(sp);
}
/*
* Tell Linux to abandon recovery of the device. The kernel might be able
* to recover the device, but RM and clients don't yet support that.
*/
return PCI_ERS_RESULT_DISCONNECT;
}
struct pci_error_handlers nv_pci_error_handlers = {
.error_detected = nv_pci_error_detected,
.mmio_enabled = nv_pci_mmio_enabled,
};
#endif
#if defined(CONFIG_PM)
extern struct dev_pm_ops nv_pm_ops;
#endif
struct pci_driver nv_pci_driver = {
.name = MODULE_NAME,
.id_table = nv_pci_table,
.probe = nv_pci_probe,
.remove = nv_pci_remove,
.shutdown = nv_pci_shutdown,
#if defined(CONFIG_PM)
.driver.pm = &nv_pm_ops,
#endif
#if defined(NV_PCI_ERROR_RECOVERY)
.err_handler = &nv_pci_error_handlers,
#endif
};
void nv_pci_unregister_driver(void)
{
if (NVreg_RegisterPCIDriver == 0)
{
return;
}
return pci_unregister_driver(&nv_pci_driver);
}
int nv_pci_register_driver(void)
{
if (NVreg_RegisterPCIDriver == 0)
{
return 0;
}
return pci_register_driver(&nv_pci_driver);
}
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