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freebsd-dev/sys/dev/drm2/drm_pci.c
Pawel Biernacki 59e4be225c Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (5 of many) 
r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are
still not MPSAFE (or already are but aren’t properly marked). Use it in
preparation for a general review of all nodes.
This is non-functional change that adds annotations to SYSCTL_NODE and
SYSCTL_PROC nodes using one of the soon-to-be-required flags.

Reviewed by:	imp, kib
Approved by:	kib (mentor)
Differential Revision:	https://reviews.freebsd.org/D23633
2020-02-16 17:11:54 +00:00

494 lines
12 KiB
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/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
/**
* \file drm_pci.c
* \brief Functions and ioctls to manage PCI memory
*
* \warning These interfaces aren't stable yet.
*
* \todo Implement the remaining ioctl's for the PCI pools.
* \todo The wrappers here are so thin that they would be better off inlined..
*
* \author José Fonseca <jrfonseca@tungstengraphics.com>
* \author Leif Delgass <ldelgass@retinalburn.net>
*/
/*
* Copyright 2003 José Fonseca.
* Copyright 2003 Leif Delgass.
* All Rights Reserved.
*
* 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 (including the next
* paragraph) 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 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <dev/drm2/drmP.h>
static int drm_msi = 1; /* Enable by default. */
SYSCTL_NODE(_hw, OID_AUTO, drm, CTLFLAG_RW | CTLFLAG_MPSAFE, NULL,
"DRM device");
SYSCTL_INT(_hw_drm, OID_AUTO, msi, CTLFLAG_RDTUN, &drm_msi, 1,
"Enable MSI interrupts for drm devices");
/**********************************************************************/
/** \name PCI memory */
/*@{*/
static void
drm_pci_busdma_callback(void *arg, bus_dma_segment_t *segs, int nsegs, int error)
{
drm_dma_handle_t *dmah = arg;
if (error != 0)
return;
KASSERT(nsegs == 1, ("drm_pci_busdma_callback: bad dma segment count"));
dmah->busaddr = segs[0].ds_addr;
}
/**
* \brief Allocate a PCI consistent memory block, for DMA.
*/
drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size,
size_t align, dma_addr_t maxaddr)
{
drm_dma_handle_t *dmah;
int ret;
/* Need power-of-two alignment, so fail the allocation if it isn't. */
if ((align & (align - 1)) != 0) {
DRM_ERROR("drm_pci_alloc with non-power-of-two alignment %d\n",
(int)align);
return NULL;
}
dmah = malloc(sizeof(drm_dma_handle_t), DRM_MEM_DMA, M_ZERO | M_NOWAIT);
if (dmah == NULL)
return NULL;
/* Make sure we aren't holding mutexes here */
mtx_assert(&dev->dma_lock, MA_NOTOWNED);
if (mtx_owned(&dev->dma_lock))
DRM_ERROR("called while holding dma_lock\n");
ret = bus_dma_tag_create(
bus_get_dma_tag(dev->dev), /* parent */
align, 0, /* align, boundary */
maxaddr, BUS_SPACE_MAXADDR, /* lowaddr, highaddr */
NULL, NULL, /* filtfunc, filtfuncargs */
size, 1, size, /* maxsize, nsegs, maxsegsize */
0, NULL, NULL, /* flags, lockfunc, lockfuncargs */
&dmah->tag);
if (ret != 0) {
free(dmah, DRM_MEM_DMA);
return NULL;
}
ret = bus_dmamem_alloc(dmah->tag, &dmah->vaddr,
BUS_DMA_WAITOK | BUS_DMA_ZERO | BUS_DMA_NOCACHE, &dmah->map);
if (ret != 0) {
bus_dma_tag_destroy(dmah->tag);
free(dmah, DRM_MEM_DMA);
return NULL;
}
ret = bus_dmamap_load(dmah->tag, dmah->map, dmah->vaddr, size,
drm_pci_busdma_callback, dmah, BUS_DMA_NOWAIT);
if (ret != 0) {
bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
bus_dma_tag_destroy(dmah->tag);
free(dmah, DRM_MEM_DMA);
return NULL;
}
return dmah;
}
EXPORT_SYMBOL(drm_pci_alloc);
/**
* \brief Free a PCI consistent memory block without freeing its descriptor.
*
* This function is for internal use in the Linux-specific DRM core code.
*/
void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
{
if (dmah == NULL)
return;
bus_dmamap_unload(dmah->tag, dmah->map);
bus_dmamem_free(dmah->tag, dmah->vaddr, dmah->map);
bus_dma_tag_destroy(dmah->tag);
}
/**
* \brief Free a PCI consistent memory block
*/
void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
{
__drm_pci_free(dev, dmah);
free(dmah, DRM_MEM_DMA);
}
EXPORT_SYMBOL(drm_pci_free);
static int drm_get_pci_domain(struct drm_device *dev)
{
return dev->pci_domain;
}
static int drm_pci_get_irq(struct drm_device *dev)
{
if (dev->irqr)
return (dev->irq);
dev->irqr = bus_alloc_resource_any(dev->dev, SYS_RES_IRQ,
&dev->irqrid, RF_SHAREABLE);
if (!dev->irqr) {
dev_err(dev->dev, "Failed to allocate IRQ\n");
return (0);
}
dev->irq = (int) rman_get_start(dev->irqr);
return (dev->irq);
}
static void drm_pci_free_irq(struct drm_device *dev)
{
if (dev->irqr == NULL)
return;
bus_release_resource(dev->dev, SYS_RES_IRQ,
dev->irqrid, dev->irqr);
dev->irqr = NULL;
dev->irq = 0;
}
static const char *drm_pci_get_name(struct drm_device *dev)
{
return dev->driver->name;
}
int drm_pci_set_busid(struct drm_device *dev, struct drm_master *master)
{
int len, ret;
master->unique_len = 40;
master->unique_size = master->unique_len;
master->unique = malloc(master->unique_size, DRM_MEM_DRIVER, M_NOWAIT);
if (master->unique == NULL)
return -ENOMEM;
len = snprintf(master->unique, master->unique_len,
"pci:%04x:%02x:%02x.%d",
dev->pci_domain,
dev->pci_bus,
dev->pci_slot,
dev->pci_func);
if (len >= master->unique_len) {
DRM_ERROR("buffer overflow");
ret = -EINVAL;
goto err;
} else
master->unique_len = len;
return 0;
err:
return ret;
}
int drm_pci_set_unique(struct drm_device *dev,
struct drm_master *master,
struct drm_unique *u)
{
int domain, bus, slot, func, ret;
master->unique_len = u->unique_len;
master->unique_size = u->unique_len + 1;
master->unique = malloc(master->unique_size, DRM_MEM_DRIVER, M_WAITOK);
if (!master->unique) {
ret = -ENOMEM;
goto err;
}
if (copy_from_user(master->unique, u->unique, master->unique_len)) {
ret = -EFAULT;
goto err;
}
master->unique[master->unique_len] = '\0';
/* Return error if the busid submitted doesn't match the device's actual
* busid.
*/
ret = sscanf(master->unique, "PCI:%d:%d:%d", &bus, &slot, &func);
if (ret != 3) {
ret = -EINVAL;
goto err;
}
domain = bus >> 8;
bus &= 0xff;
if ((domain != dev->pci_domain) ||
(bus != dev->pci_bus) ||
(slot != dev->pci_slot) ||
(func != dev->pci_func)) {
ret = -EINVAL;
goto err;
}
return 0;
err:
return ret;
}
static int drm_pci_irq_by_busid(struct drm_device *dev, struct drm_irq_busid *p)
{
if ((p->busnum >> 8) != drm_get_pci_domain(dev) ||
(p->busnum & 0xff) != dev->pci_bus ||
p->devnum != dev->pci_slot || p->funcnum != dev->pci_func)
return -EINVAL;
p->irq = dev->irq;
DRM_DEBUG("%d:%d:%d => IRQ %d\n", p->busnum, p->devnum, p->funcnum,
p->irq);
return 0;
}
int drm_pci_agp_init(struct drm_device *dev)
{
if (drm_core_has_AGP(dev)) {
if (drm_pci_device_is_agp(dev))
dev->agp = drm_agp_init(dev);
if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
&& (dev->agp == NULL)) {
DRM_ERROR("Cannot initialize the agpgart module.\n");
return -EINVAL;
}
if (drm_core_has_MTRR(dev)) {
if (dev->agp && dev->agp->agp_info.ai_aperture_base != 0) {
if (drm_mtrr_add(dev->agp->agp_info.ai_aperture_base,
dev->agp->agp_info.ai_aperture_size, DRM_MTRR_WC) == 0)
dev->agp->agp_mtrr = 1;
else
dev->agp->agp_mtrr = -1;
}
}
}
return 0;
}
static struct drm_bus drm_pci_bus = {
.bus_type = DRIVER_BUS_PCI,
.get_irq = drm_pci_get_irq,
.free_irq = drm_pci_free_irq,
.get_name = drm_pci_get_name,
.set_busid = drm_pci_set_busid,
.set_unique = drm_pci_set_unique,
.irq_by_busid = drm_pci_irq_by_busid,
.agp_init = drm_pci_agp_init,
};
/**
* Register.
*
* \param pdev - PCI device structure
* \param ent entry from the PCI ID table with device type flags
* \return zero on success or a negative number on failure.
*
* Attempt to gets inter module "drm" information. If we are first
* then register the character device and inter module information.
* Try and register, if we fail to register, backout previous work.
*/
int drm_get_pci_dev(device_t kdev, struct drm_device *dev,
struct drm_driver *driver)
{
int ret;
DRM_DEBUG("\n");
driver->bus = &drm_pci_bus;
dev->dev = kdev;
dev->pci_domain = pci_get_domain(dev->dev);
dev->pci_bus = pci_get_bus(dev->dev);
dev->pci_slot = pci_get_slot(dev->dev);
dev->pci_func = pci_get_function(dev->dev);
dev->pci_vendor = pci_get_vendor(dev->dev);
dev->pci_device = pci_get_device(dev->dev);
dev->pci_subvendor = pci_get_subvendor(dev->dev);
dev->pci_subdevice = pci_get_subdevice(dev->dev);
sx_xlock(&drm_global_mutex);
if ((ret = drm_fill_in_dev(dev, driver))) {
DRM_ERROR("Failed to fill in dev: %d\n", ret);
goto err_g1;
}
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
ret = drm_get_minor(dev, &dev->control, DRM_MINOR_CONTROL);
if (ret)
goto err_g2;
}
if ((ret = drm_get_minor(dev, &dev->primary, DRM_MINOR_LEGACY)))
goto err_g3;
if (dev->driver->load) {
ret = dev->driver->load(dev,
dev->id_entry->driver_private);
if (ret)
goto err_g4;
}
/* setup the grouping for the legacy output */
if (drm_core_check_feature(dev, DRIVER_MODESET)) {
ret = drm_mode_group_init_legacy_group(dev,
&dev->primary->mode_group);
if (ret)
goto err_g5;
}
#ifdef FREEBSD_NOTYET
list_add_tail(&dev->driver_item, &driver->device_list);
#endif /* FREEBSD_NOTYET */
DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n",
driver->name, driver->major, driver->minor, driver->patchlevel,
driver->date, device_get_nameunit(dev->dev), dev->primary->index);
sx_xunlock(&drm_global_mutex);
return 0;
err_g5:
if (dev->driver->unload)
dev->driver->unload(dev);
err_g4:
drm_put_minor(&dev->primary);
err_g3:
if (drm_core_check_feature(dev, DRIVER_MODESET))
drm_put_minor(&dev->control);
err_g2:
drm_cancel_fill_in_dev(dev);
err_g1:
sx_xunlock(&drm_global_mutex);
return ret;
}
EXPORT_SYMBOL(drm_get_pci_dev);
int
drm_pci_enable_msi(struct drm_device *dev)
{
int msicount, ret;
if (!drm_msi)
return (-ENOENT);
msicount = pci_msi_count(dev->dev);
DRM_DEBUG("MSI count = %d\n", msicount);
if (msicount > 1)
msicount = 1;
ret = pci_alloc_msi(dev->dev, &msicount);
if (ret == 0) {
DRM_INFO("MSI enabled %d message(s)\n", msicount);
dev->msi_enabled = 1;
dev->irqrid = 1;
}
return (-ret);
}
void
drm_pci_disable_msi(struct drm_device *dev)
{
if (!dev->msi_enabled)
return;
pci_release_msi(dev->dev);
dev->msi_enabled = 0;
dev->irqrid = 0;
}
int drm_pcie_get_speed_cap_mask(struct drm_device *dev, u32 *mask)
{
device_t root;
int pos;
u32 lnkcap = 0, lnkcap2 = 0;
*mask = 0;
if (!drm_pci_device_is_pcie(dev))
return -EINVAL;
root =
device_get_parent( /* pcib */
device_get_parent( /* `-- pci */
device_get_parent( /* `-- vgapci */
dev->dev))); /* `-- drmn */
pos = 0;
pci_find_cap(root, PCIY_EXPRESS, &pos);
if (!pos)
return -EINVAL;
/* we've been informed via and serverworks don't make the cut */
if (pci_get_vendor(root) == PCI_VENDOR_ID_VIA ||
pci_get_vendor(root) == PCI_VENDOR_ID_SERVERWORKS)
return -EINVAL;
lnkcap = pci_read_config(root, pos + PCIER_LINK_CAP, 4);
lnkcap2 = pci_read_config(root, pos + PCIER_LINK_CAP2, 4);
lnkcap &= PCIEM_LINK_CAP_MAX_SPEED;
lnkcap2 &= 0xfe;
#define PCI_EXP_LNKCAP2_SLS_2_5GB 0x02 /* Supported Link Speed 2.5GT/s */
#define PCI_EXP_LNKCAP2_SLS_5_0GB 0x04 /* Supported Link Speed 5.0GT/s */
#define PCI_EXP_LNKCAP2_SLS_8_0GB 0x08 /* Supported Link Speed 8.0GT/s */
if (lnkcap2) { /* PCIE GEN 3.0 */
if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_2_5GB)
*mask |= DRM_PCIE_SPEED_25;
if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_5_0GB)
*mask |= DRM_PCIE_SPEED_50;
if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB)
*mask |= DRM_PCIE_SPEED_80;
} else {
if (lnkcap & 1)
*mask |= DRM_PCIE_SPEED_25;
if (lnkcap & 2)
*mask |= DRM_PCIE_SPEED_50;
}
DRM_INFO("probing gen 2 caps for device %x:%x = %x/%x\n", pci_get_vendor(root), pci_get_device(root), lnkcap, lnkcap2);
return 0;
}
EXPORT_SYMBOL(drm_pcie_get_speed_cap_mask);
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