platform-drivers-x86 for v6.7-6

Fixes:
 - Intel PMC GBE LTR regression
 - P2SB / PCI deadlock fix
 
 The following is an automated shortlog grouped by driver:
 
 intel/pmc:
  -  Add suspend callback
  -  Allow reenabling LTRs
  -  Move GBE LTR ignore to suspend callback
 
 p2sb:
  -  Allow p2sb_bar() calls during PCI device probe
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Merge tag 'platform-drivers-x86-v6.7-6' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86

Pull x86 platform driver fixes from Ilpo Järvinen:

 - Intel PMC GBE LTR regression

 - P2SB / PCI deadlock fix

* tag 'platform-drivers-x86-v6.7-6' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86:
  platform/x86/intel/pmc: Move GBE LTR ignore to suspend callback
  platform/x86/intel/pmc: Allow reenabling LTRs
  platform/x86/intel/pmc: Add suspend callback
  platform/x86: p2sb: Allow p2sb_bar() calls during PCI device probe
This commit is contained in:
Linus Torvalds 2023-12-29 11:50:47 -08:00
commit e543d0b5ec
7 changed files with 179 additions and 71 deletions

View File

@ -314,16 +314,13 @@ int adl_core_init(struct pmc_dev *pmcdev)
struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
int ret;
pmcdev->suspend = cnl_suspend;
pmcdev->resume = cnl_resume;
pmc->map = &adl_reg_map;
ret = get_primary_reg_base(pmc);
if (ret)
return ret;
/* Due to a hardware limitation, the GBE LTR blocks PC10
* when a cable is attached. Tell the PMC to ignore it.
*/
dev_dbg(&pmcdev->pdev->dev, "ignoring GBE LTR\n");
pmc_core_send_ltr_ignore(pmcdev, 3);
return 0;
}

View File

@ -204,21 +204,35 @@ const struct pmc_reg_map cnp_reg_map = {
.etr3_offset = ETR3_OFFSET,
};
void cnl_suspend(struct pmc_dev *pmcdev)
{
/*
* Due to a hardware limitation, the GBE LTR blocks PC10
* when a cable is attached. To unblock PC10 during suspend,
* tell the PMC to ignore it.
*/
pmc_core_send_ltr_ignore(pmcdev, 3, 1);
}
int cnl_resume(struct pmc_dev *pmcdev)
{
pmc_core_send_ltr_ignore(pmcdev, 3, 0);
return pmc_core_resume_common(pmcdev);
}
int cnp_core_init(struct pmc_dev *pmcdev)
{
struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
int ret;
pmcdev->suspend = cnl_suspend;
pmcdev->resume = cnl_resume;
pmc->map = &cnp_reg_map;
ret = get_primary_reg_base(pmc);
if (ret)
return ret;
/* Due to a hardware limitation, the GBE LTR blocks PC10
* when a cable is attached. Tell the PMC to ignore it.
*/
dev_dbg(&pmcdev->pdev->dev, "ignoring GBE LTR\n");
pmc_core_send_ltr_ignore(pmcdev, 3);
return 0;
}

View File

@ -460,7 +460,7 @@ out_unlock:
}
DEFINE_SHOW_ATTRIBUTE(pmc_core_pll);
int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value)
int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value, int ignore)
{
struct pmc *pmc;
const struct pmc_reg_map *map;
@ -498,7 +498,10 @@ int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value)
mutex_lock(&pmcdev->lock);
reg = pmc_core_reg_read(pmc, map->ltr_ignore_offset);
reg |= BIT(ltr_index);
if (ignore)
reg |= BIT(ltr_index);
else
reg &= ~BIT(ltr_index);
pmc_core_reg_write(pmc, map->ltr_ignore_offset, reg);
mutex_unlock(&pmcdev->lock);
@ -521,7 +524,7 @@ static ssize_t pmc_core_ltr_ignore_write(struct file *file,
if (err)
return err;
err = pmc_core_send_ltr_ignore(pmcdev, value);
err = pmc_core_send_ltr_ignore(pmcdev, value, 1);
return err == 0 ? count : err;
}
@ -1279,6 +1282,9 @@ static __maybe_unused int pmc_core_suspend(struct device *dev)
struct pmc_dev *pmcdev = dev_get_drvdata(dev);
struct pmc *pmc = pmcdev->pmcs[PMC_IDX_MAIN];
if (pmcdev->suspend)
pmcdev->suspend(pmcdev);
/* Check if the syspend will actually use S0ix */
if (pm_suspend_via_firmware())
return 0;

View File

@ -363,6 +363,7 @@ struct pmc {
* @s0ix_counter: S0ix residency (step adjusted)
* @num_lpm_modes: Count of enabled modes
* @lpm_en_modes: Array of enabled modes from lowest to highest priority
* @suspend: Function to perform platform specific suspend
* @resume: Function to perform platform specific resume
*
* pmc_dev contains info about power management controller device.
@ -379,6 +380,7 @@ struct pmc_dev {
u64 s0ix_counter;
int num_lpm_modes;
int lpm_en_modes[LPM_MAX_NUM_MODES];
void (*suspend)(struct pmc_dev *pmcdev);
int (*resume)(struct pmc_dev *pmcdev);
bool has_die_c6;
@ -486,7 +488,7 @@ extern const struct pmc_bit_map *mtl_ioem_lpm_maps[];
extern const struct pmc_reg_map mtl_ioem_reg_map;
extern void pmc_core_get_tgl_lpm_reqs(struct platform_device *pdev);
extern int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value);
int pmc_core_send_ltr_ignore(struct pmc_dev *pmcdev, u32 value, int ignore);
int pmc_core_resume_common(struct pmc_dev *pmcdev);
int get_primary_reg_base(struct pmc *pmc);
@ -500,6 +502,9 @@ int tgl_core_init(struct pmc_dev *pmcdev);
int adl_core_init(struct pmc_dev *pmcdev);
int mtl_core_init(struct pmc_dev *pmcdev);
void cnl_suspend(struct pmc_dev *pmcdev);
int cnl_resume(struct pmc_dev *pmcdev);
#define pmc_for_each_mode(i, mode, pmcdev) \
for (i = 0, mode = pmcdev->lpm_en_modes[i]; \
i < pmcdev->num_lpm_modes; \

View File

@ -979,6 +979,8 @@ static void mtl_d3_fixup(void)
static int mtl_resume(struct pmc_dev *pmcdev)
{
mtl_d3_fixup();
pmc_core_send_ltr_ignore(pmcdev, 3, 0);
return pmc_core_resume_common(pmcdev);
}
@ -989,6 +991,7 @@ int mtl_core_init(struct pmc_dev *pmcdev)
mtl_d3_fixup();
pmcdev->suspend = cnl_suspend;
pmcdev->resume = mtl_resume;
pmcdev->regmap_list = mtl_pmc_info_list;
@ -1002,11 +1005,5 @@ int mtl_core_init(struct pmc_dev *pmcdev)
return ret;
}
/* Due to a hardware limitation, the GBE LTR blocks PC10
* when a cable is attached. Tell the PMC to ignore it.
*/
dev_dbg(&pmcdev->pdev->dev, "ignoring GBE LTR\n");
pmc_core_send_ltr_ignore(pmcdev, 3);
return 0;
}

View File

@ -259,16 +259,15 @@ int tgl_core_init(struct pmc_dev *pmcdev)
int ret;
pmc->map = &tgl_reg_map;
pmcdev->suspend = cnl_suspend;
pmcdev->resume = cnl_resume;
ret = get_primary_reg_base(pmc);
if (ret)
return ret;
pmc_core_get_tgl_lpm_reqs(pmcdev->pdev);
/* Due to a hardware limitation, the GBE LTR blocks PC10
* when a cable is attached. Tell the PMC to ignore it.
*/
dev_dbg(&pmcdev->pdev->dev, "ignoring GBE LTR\n");
pmc_core_send_ltr_ignore(pmcdev, 3);
return 0;
}

View File

@ -26,6 +26,21 @@ static const struct x86_cpu_id p2sb_cpu_ids[] = {
{}
};
/*
* Cache BAR0 of P2SB device functions 0 to 7.
* TODO: The constant 8 is the number of functions that PCI specification
* defines. Same definitions exist tree-wide. Unify this definition and
* the other definitions then move to include/uapi/linux/pci.h.
*/
#define NR_P2SB_RES_CACHE 8
struct p2sb_res_cache {
u32 bus_dev_id;
struct resource res;
};
static struct p2sb_res_cache p2sb_resources[NR_P2SB_RES_CACHE];
static int p2sb_get_devfn(unsigned int *devfn)
{
unsigned int fn = P2SB_DEVFN_DEFAULT;
@ -39,8 +54,16 @@ static int p2sb_get_devfn(unsigned int *devfn)
return 0;
}
static bool p2sb_valid_resource(struct resource *res)
{
if (res->flags)
return true;
return false;
}
/* Copy resource from the first BAR of the device in question */
static int p2sb_read_bar0(struct pci_dev *pdev, struct resource *mem)
static void p2sb_read_bar0(struct pci_dev *pdev, struct resource *mem)
{
struct resource *bar0 = &pdev->resource[0];
@ -56,47 +79,64 @@ static int p2sb_read_bar0(struct pci_dev *pdev, struct resource *mem)
mem->end = bar0->end;
mem->flags = bar0->flags;
mem->desc = bar0->desc;
}
static void p2sb_scan_and_cache_devfn(struct pci_bus *bus, unsigned int devfn)
{
struct p2sb_res_cache *cache = &p2sb_resources[PCI_FUNC(devfn)];
struct pci_dev *pdev;
pdev = pci_scan_single_device(bus, devfn);
if (!pdev)
return;
p2sb_read_bar0(pdev, &cache->res);
cache->bus_dev_id = bus->dev.id;
pci_stop_and_remove_bus_device(pdev);
return;
}
static int p2sb_scan_and_cache(struct pci_bus *bus, unsigned int devfn)
{
unsigned int slot, fn;
if (PCI_FUNC(devfn) == 0) {
/*
* When function number of the P2SB device is zero, scan it and
* other function numbers, and if devices are available, cache
* their BAR0s.
*/
slot = PCI_SLOT(devfn);
for (fn = 0; fn < NR_P2SB_RES_CACHE; fn++)
p2sb_scan_and_cache_devfn(bus, PCI_DEVFN(slot, fn));
} else {
/* Scan the P2SB device and cache its BAR0 */
p2sb_scan_and_cache_devfn(bus, devfn);
}
if (!p2sb_valid_resource(&p2sb_resources[PCI_FUNC(devfn)].res))
return -ENOENT;
return 0;
}
static int p2sb_scan_and_read(struct pci_bus *bus, unsigned int devfn, struct resource *mem)
static struct pci_bus *p2sb_get_bus(struct pci_bus *bus)
{
struct pci_dev *pdev;
int ret;
static struct pci_bus *p2sb_bus;
pdev = pci_scan_single_device(bus, devfn);
if (!pdev)
return -ENODEV;
bus = bus ?: p2sb_bus;
if (bus)
return bus;
ret = p2sb_read_bar0(pdev, mem);
pci_stop_and_remove_bus_device(pdev);
return ret;
/* Assume P2SB is on the bus 0 in domain 0 */
p2sb_bus = pci_find_bus(0, 0);
return p2sb_bus;
}
/**
* p2sb_bar - Get Primary to Sideband (P2SB) bridge device BAR
* @bus: PCI bus to communicate with
* @devfn: PCI slot and function to communicate with
* @mem: memory resource to be filled in
*
* The BIOS prevents the P2SB device from being enumerated by the PCI
* subsystem, so we need to unhide and hide it back to lookup the BAR.
*
* if @bus is NULL, the bus 0 in domain 0 will be used.
* If @devfn is 0, it will be replaced by devfn of the P2SB device.
*
* Caller must provide a valid pointer to @mem.
*
* Locking is handled by pci_rescan_remove_lock mutex.
*
* Return:
* 0 on success or appropriate errno value on error.
*/
int p2sb_bar(struct pci_bus *bus, unsigned int devfn, struct resource *mem)
static int p2sb_cache_resources(void)
{
struct pci_dev *pdev_p2sb;
struct pci_bus *bus;
unsigned int devfn_p2sb;
u32 value = P2SBC_HIDE;
int ret;
@ -106,8 +146,9 @@ int p2sb_bar(struct pci_bus *bus, unsigned int devfn, struct resource *mem)
if (ret)
return ret;
/* if @bus is NULL, use bus 0 in domain 0 */
bus = bus ?: pci_find_bus(0, 0);
bus = p2sb_get_bus(NULL);
if (!bus)
return -ENODEV;
/*
* Prevent concurrent PCI bus scan from seeing the P2SB device and
@ -115,17 +156,16 @@ int p2sb_bar(struct pci_bus *bus, unsigned int devfn, struct resource *mem)
*/
pci_lock_rescan_remove();
/* Unhide the P2SB device, if needed */
/*
* The BIOS prevents the P2SB device from being enumerated by the PCI
* subsystem, so we need to unhide and hide it back to lookup the BAR.
* Unhide the P2SB device here, if needed.
*/
pci_bus_read_config_dword(bus, devfn_p2sb, P2SBC, &value);
if (value & P2SBC_HIDE)
pci_bus_write_config_dword(bus, devfn_p2sb, P2SBC, 0);
pdev_p2sb = pci_scan_single_device(bus, devfn_p2sb);
if (devfn)
ret = p2sb_scan_and_read(bus, devfn, mem);
else
ret = p2sb_read_bar0(pdev_p2sb, mem);
pci_stop_and_remove_bus_device(pdev_p2sb);
ret = p2sb_scan_and_cache(bus, devfn_p2sb);
/* Hide the P2SB device, if it was hidden */
if (value & P2SBC_HIDE)
@ -133,12 +173,62 @@ int p2sb_bar(struct pci_bus *bus, unsigned int devfn, struct resource *mem)
pci_unlock_rescan_remove();
if (ret)
return ret;
return ret;
}
if (mem->flags == 0)
/**
* p2sb_bar - Get Primary to Sideband (P2SB) bridge device BAR
* @bus: PCI bus to communicate with
* @devfn: PCI slot and function to communicate with
* @mem: memory resource to be filled in
*
* If @bus is NULL, the bus 0 in domain 0 will be used.
* If @devfn is 0, it will be replaced by devfn of the P2SB device.
*
* Caller must provide a valid pointer to @mem.
*
* Return:
* 0 on success or appropriate errno value on error.
*/
int p2sb_bar(struct pci_bus *bus, unsigned int devfn, struct resource *mem)
{
struct p2sb_res_cache *cache;
int ret;
bus = p2sb_get_bus(bus);
if (!bus)
return -ENODEV;
if (!devfn) {
ret = p2sb_get_devfn(&devfn);
if (ret)
return ret;
}
cache = &p2sb_resources[PCI_FUNC(devfn)];
if (cache->bus_dev_id != bus->dev.id)
return -ENODEV;
if (!p2sb_valid_resource(&cache->res))
return -ENOENT;
memcpy(mem, &cache->res, sizeof(*mem));
return 0;
}
EXPORT_SYMBOL_GPL(p2sb_bar);
static int __init p2sb_fs_init(void)
{
p2sb_cache_resources();
return 0;
}
/*
* pci_rescan_remove_lock to avoid access to unhidden P2SB devices can
* not be locked in sysfs pci bus rescan path because of deadlock. To
* avoid the deadlock, access to P2SB devices with the lock at an early
* step in kernel initialization and cache required resources. This
* should happen after subsys_initcall which initializes PCI subsystem
* and before device_initcall which requires P2SB resources.
*/
fs_initcall(p2sb_fs_init);