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Date: Tue, 19 Dec 2017 18:15:10 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Zoltan Boszormenyi <zboszor@...hu>, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org, linux-watchdog@...r.kernel.org,
linux-i2c@...r.kernel.org
Cc: Paul Menzel <paulepanter@...rs.sourceforge.net>,
Christian Fetzer <fetzer.ch@...il.com>,
Jean Delvare <jdelvare@...e.com>,
Nehal Shah <nehal-bakulchandra.shah@....com>,
Tim Small <tim@...ss.co.uk>, kernel@...ss.net, wim@...ana.be,
jlayton@...chiereds.net, marc.2377@...il.com,
cshorler@...glemail.com, wsa@...-dreams.de,
regressions@...mhuis.info,
Alex Williamson <alex.williamson@...hat.com>, lyude@...hat.com,
Linus Torvalds <torvalds@...ux-foundation.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Toshi Kani <toshi.kani@....com>,
Jiang Liu <jiang.liu@...ux.intel.com>,
Jakub Sitnicki <jsitnicki@...il.com>,
Thierry Reding <treding@...dia.com>,
Vivek Goyal <vgoyal@...hat.com>,
Ingo Molnar <mingo@...nel.org>,
Simon Guinot <simon.guinot@...uanux.org>,
Dan Williams <dan.j.williams@...el.com>,
Mike Travis <travis@....com>,
Daeseok Youn <daeseok.youn@...il.com>,
Huang Rui <ray.huang@....com>, Andiry Xu <andiry.xu@....com>,
Alan Cox <gnomes@...rguk.ukuu.org.uk>,
David Howells <dhowells@...hat.com>,
Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
Alexandre Desnoyers <alex@...c.com>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Grygorii Strashko <grygorii.strashko@...com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Wan ZongShun <Vincent.Wan@....com>,
Ulf Hansson <ulf.hansson@...aro.org>,
Lucas Stach <dev@...xeye.de>,
Denis Turischev <denis.turischev@...pulab.co.il>
Subject: Re: [PATCH 4/5 v5] i2c: i2c-piix4: Use
request_declared_muxed_region()
On 12/18/2017 12:48 AM, Zoltan Boszormenyi wrote:
> From: Böszörményi Zoltán <zboszor@...hu>
>
> Use the new request_declared_muxed_region() macro to
> synchronize access to the I/O port pair 0xcd6 / 0xcd7.
>
> At the same time, remove the long lifetime request_region()
> call to reserve these I/O ports, so the sp5100_tco watchdog
> driver can also load.
>
> This fixes an old regression in Linux 4.4-rc4, caused by
> commit 2fee61d22e60 ("i2c: piix4: Add support for multiplexed
> main adapter in SB800")
>
> v1: Started with a common mutex in a C source file.
>
> v2: Referenced to common mutex from drivers/usb/host/pci-quirks.c
>
> v3: Switched to using the new request_declared_muxed_region
> macro.
>
> v4: Fixed checkpatch.pl warnings and use the new
> release_declared_region() macro.
>
> v5: Rebased for 4.15-rc4
> Use struct i2c_algorithm pointer directly instead of
> a bool to select the proper algo.
This change makes sense, but it should be a separate patch.
Guenter
>
> Signed-off-by: Zoltán Böszörményi <zboszor@...hu>
> ---
> drivers/i2c/busses/i2c-piix4.c | 51 +++++++++++++++---------------------------
> 1 file changed, 18 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
> index 462948e2c535..1846d9ea7d27 100644
> --- a/drivers/i2c/busses/i2c-piix4.c
> +++ b/drivers/i2c/busses/i2c-piix4.c
> @@ -153,10 +153,11 @@ static const struct dmi_system_id piix4_dmi_ibm[] = {
>
> /*
> * SB800 globals
> - * piix4_mutex_sb800 protects piix4_port_sel_sb800 and the pair
> + * request_declared_muxed_region() protects piix4_port_sel_sb800 and the pair
> * of I/O ports at SB800_PIIX4_SMB_IDX.
> */
> -static DEFINE_MUTEX(piix4_mutex_sb800);
> +static struct resource sb800_res = DEFINE_RES_IO_NAMED(SB800_PIIX4_SMB_IDX, 2,
> + "i2c-piix4");
> static u8 piix4_port_sel_sb800;
> static u8 piix4_port_mask_sb800;
> static u8 piix4_port_shift_sb800;
> @@ -169,7 +170,6 @@ struct i2c_piix4_adapdata {
> unsigned short smba;
>
> /* SB800 */
> - bool sb800_main;
> bool notify_imc;
> u8 port; /* Port number, shifted */
> };
> @@ -298,12 +298,12 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
> else
> smb_en = (aux) ? 0x28 : 0x2c;
>
> - mutex_lock(&piix4_mutex_sb800);
> + request_declared_muxed_region(&sb800_res);
> outb_p(smb_en, SB800_PIIX4_SMB_IDX);
> smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
> outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
> smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
> - mutex_unlock(&piix4_mutex_sb800);
> + release_declared_region(&sb800_res);
>
> if (!smb_en) {
> smb_en_status = smba_en_lo & 0x10;
> @@ -373,7 +373,7 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
> break;
> }
> } else {
> - mutex_lock(&piix4_mutex_sb800);
> + request_declared_muxed_region(&sb800_res);
> outb_p(SB800_PIIX4_PORT_IDX_SEL, SB800_PIIX4_SMB_IDX);
> port_sel = inb_p(SB800_PIIX4_SMB_IDX + 1);
> piix4_port_sel_sb800 = (port_sel & 0x01) ?
> @@ -381,7 +381,7 @@ static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
> SB800_PIIX4_PORT_IDX;
> piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK;
> piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
> - mutex_unlock(&piix4_mutex_sb800);
> + release_declared_region(&sb800_res);
> }
>
> dev_info(&PIIX4_dev->dev,
> @@ -679,7 +679,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
> u8 port;
> int retval;
>
> - mutex_lock(&piix4_mutex_sb800);
> + request_declared_muxed_region(&sb800_res);
>
> /* Request the SMBUS semaphore, avoid conflicts with the IMC */
> smbslvcnt = inb_p(SMBSLVCNT);
> @@ -695,7 +695,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
> } while (--retries);
> /* SMBus is still owned by the IMC, we give up */
> if (!retries) {
> - mutex_unlock(&piix4_mutex_sb800);
> + release_declared_region(&sb800_res);
> return -EBUSY;
> }
>
> @@ -753,7 +753,7 @@ static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
> if ((size == I2C_SMBUS_BLOCK_DATA) && adapdata->notify_imc)
> piix4_imc_wakeup();
>
> - mutex_unlock(&piix4_mutex_sb800);
> + release_declared_region(&sb800_res);
>
> return retval;
> }
> @@ -804,7 +804,8 @@ static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS];
> static struct i2c_adapter *piix4_aux_adapter;
>
> static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
> - bool sb800_main, u8 port, bool notify_imc,
> + struct i2c_algorithm *algo,
> + u8 port, bool notify_imc,
> const char *name, struct i2c_adapter **padap)
> {
> struct i2c_adapter *adap;
> @@ -819,8 +820,7 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
>
> adap->owner = THIS_MODULE;
> adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
> - adap->algo = sb800_main ? &piix4_smbus_algorithm_sb800
> - : &smbus_algorithm;
> + adap->algo = algo;
>
> adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
> if (adapdata == NULL) {
> @@ -830,7 +830,6 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
> }
>
> adapdata->smba = smba;
> - adapdata->sb800_main = sb800_main;
> adapdata->port = port << piix4_port_shift_sb800;
> adapdata->notify_imc = notify_imc;
>
> @@ -862,7 +861,9 @@ static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba,
> int retval;
>
> for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) {
> - retval = piix4_add_adapter(dev, smba, true, port, notify_imc,
> + retval = piix4_add_adapter(dev, smba,
> + &piix4_smbus_algorithm_sb800,
> + port, notify_imc,
> piix4_main_port_names_sb800[port],
> &piix4_main_adapters[port]);
> if (retval < 0)
> @@ -899,13 +900,6 @@ static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
> bool notify_imc = false;
> is_sb800 = true;
>
> - if (!request_region(SB800_PIIX4_SMB_IDX, 2, "smba_idx")) {
> - dev_err(&dev->dev,
> - "SMBus base address index region 0x%x already in use!\n",
> - SB800_PIIX4_SMB_IDX);
> - return -EBUSY;
> - }
> -
> if (dev->vendor == PCI_VENDOR_ID_AMD &&
> dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) {
> u8 imc;
> @@ -922,27 +916,24 @@ static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
>
> /* base address location etc changed in SB800 */
> retval = piix4_setup_sb800(dev, id, 0);
> - if (retval < 0) {
> - release_region(SB800_PIIX4_SMB_IDX, 2);
> + if (retval < 0)
> return retval;
> - }
>
> /*
> * Try to register multiplexed main SMBus adapter,
> * give up if we can't
> */
> retval = piix4_add_adapters_sb800(dev, retval, notify_imc);
> - if (retval < 0) {
> - release_region(SB800_PIIX4_SMB_IDX, 2);
> + if (retval < 0)
> return retval;
> - }
> } else {
> retval = piix4_setup(dev, id);
> if (retval < 0)
> return retval;
>
> /* Try to register main SMBus adapter, give up if we can't */
> - retval = piix4_add_adapter(dev, retval, false, 0, false, "",
> + retval = piix4_add_adapter(dev, retval,
> + &smbus_algorithm, 0, false, "",
> &piix4_main_adapters[0]);
> if (retval < 0)
> return retval;
> @@ -983,11 +974,8 @@ static void piix4_adap_remove(struct i2c_adapter *adap)
>
> if (adapdata->smba) {
> i2c_del_adapter(adap);
> - if (adapdata->port == (0 << piix4_port_shift_sb800)) {
> + if (adapdata->port == (0 << piix4_port_shift_sb800))
> release_region(adapdata->smba, SMBIOSIZE);
> - if (adapdata->sb800_main)
> - release_region(SB800_PIIX4_SMB_IDX, 2);
> - }
> kfree(adapdata);
> kfree(adap);
> }
>
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