GenWQE: Add sysfs interface for bitstream reload (c1f732ad) · Commits · e / devices / android_kernel_fairphone_FP4

Documentation/ABI/testing/sysfs-driver-genwqe

+9 −0

Original line number	Diff line number	Diff line
		@@ -25,6 +25,15 @@ Date: Oct 2013
		Contact: haver@linux.vnet.ibm.com
		Description: Interface to set the next bitstream to be used.

		What: /sys/class/genwqe/genwqe<n>_card/reload_bitstream
		Date: May 2014
		Contact: klebers@linux.vnet.ibm.com
		Description: Interface to trigger a PCIe card reset to reload the bitstream.
		sudo sh -c 'echo 1 > \
		/sys/class/genwqe/genwqe0_card/reload_bitstream'
		If successfully, the card will come back with the bitstream set
		on 'next_bitstream'.

		What: /sys/class/genwqe/genwqe<n>_card/tempsens
		Date: Oct 2013
		Contact: haver@linux.vnet.ibm.com

drivers/misc/genwqe/card_base.c

+90 −0

Original line number	Diff line number	Diff line
		@@ -760,6 +760,89 @@ static u64 genwqe_fir_checking(struct genwqe_dev *cd)
		return IO_ILLEGAL_VALUE;
		}

		/**
		* genwqe_pci_fundamental_reset() - trigger a PCIe fundamental reset on the slot
		*
		* Note: pci_set_pcie_reset_state() is not implemented on all archs, so this
		* reset method will not work in all cases.
		*
		* Return: 0 on success or error code from pci_set_pcie_reset_state()
		*/
		static int genwqe_pci_fundamental_reset(struct pci_dev *pci_dev)
		{
		int rc;

		/*
		* lock pci config space access from userspace,
		* save state and issue PCIe fundamental reset
		*/
		pci_cfg_access_lock(pci_dev);
		pci_save_state(pci_dev);
		rc = pci_set_pcie_reset_state(pci_dev, pcie_warm_reset);
		if (!rc) {
		/* keep PCIe reset asserted for 250ms */
		msleep(250);
		pci_set_pcie_reset_state(pci_dev, pcie_deassert_reset);
		/* Wait for 2s to reload flash and train the link */
		msleep(2000);
		}
		pci_restore_state(pci_dev);
		pci_cfg_access_unlock(pci_dev);
		return rc;
		}

		/*
		* genwqe_reload_bistream() - reload card bitstream
		*
		* Set the appropriate register and call fundamental reset to reaload the card
		* bitstream.
		*
		* Return: 0 on success, error code otherwise
		*/
		static int genwqe_reload_bistream(struct genwqe_dev *cd)
		{
		struct pci_dev *pci_dev = cd->pci_dev;
		int rc;

		dev_info(&pci_dev->dev,
		"[%s] resetting card for bitstream reload\n",
		__func__);

		genwqe_stop(cd);

		/*
		* Cause a CPLD reprogram with the 'next_bitstream'
		* partition on PCIe hot or fundamental reset
		*/
		__genwqe_writeq(cd, IO_SLC_CFGREG_SOFTRESET,
		(cd->softreset & 0xcull) \| 0x70ull);

		rc = genwqe_pci_fundamental_reset(pci_dev);
		if (rc) {
		/*
		* A fundamental reset failure can be caused
		* by lack of support on the arch, so we just
		* log the error and try to start the card
		* again.
		*/
		dev_err(&pci_dev->dev,
		"[%s] err: failed to reset card for bitstream reload\n",
		__func__);
		}

		rc = genwqe_start(cd);
		if (rc) {
		dev_err(&pci_dev->dev,
		"[%s] err: cannot start card services! (err=%d)\n",
		__func__, rc);
		return rc;
		}
		dev_info(&pci_dev->dev,
		"[%s] card reloaded\n", __func__);
		return 0;
		}


		/**
		* genwqe_health_thread() - Health checking thread
		*
		@@ -846,6 +929,13 @@ static int genwqe_health_thread(void *data)
		}
		}

		if (cd->card_state == GENWQE_CARD_RELOAD_BITSTREAM) {
		/* Userspace requested card bitstream reload */
		rc = genwqe_reload_bistream(cd);
		if (rc)
		goto fatal_error;
		}

		cd->last_gfir = gfir;
		cond_resched();
		}

drivers/misc/genwqe/card_sysfs.c

+25 −0

Original line number	Diff line number	Diff line
		@@ -223,6 +223,30 @@ static ssize_t next_bitstream_store(struct device *dev,
		}
		static DEVICE_ATTR_RW(next_bitstream);

		static ssize_t reload_bitstream_store(struct device *dev,
		struct device_attribute *attr,
		const char *buf, size_t count)
		{
		int reload;
		struct genwqe_dev *cd = dev_get_drvdata(dev);

		if (kstrtoint(buf, 0, &reload) < 0)
		return -EINVAL;

		if (reload == 0x1) {
		if (cd->card_state == GENWQE_CARD_UNUSED \|\|
		cd->card_state == GENWQE_CARD_USED)
		cd->card_state = GENWQE_CARD_RELOAD_BITSTREAM;
		else
		return -EIO;
		} else {
		return -EINVAL;
		}

		return count;
		}
		static DEVICE_ATTR_WO(reload_bitstream);

		/*
		* Create device_attribute structures / params: name, mode, show, store
		* additional flag if valid in VF
		@@ -239,6 +263,7 @@ static struct attribute *genwqe_attributes[] = {
		&dev_attr_status.attr,
		&dev_attr_freerunning_timer.attr,
		&dev_attr_queue_working_time.attr,
		&dev_attr_reload_bitstream.attr,
		NULL,
		};

include/uapi/linux/genwqe/genwqe_card.h

+1 −0

Original line number	Diff line number	Diff line
		@@ -328,6 +328,7 @@ enum genwqe_card_state {
		GENWQE_CARD_UNUSED = 0,
		GENWQE_CARD_USED = 1,
		GENWQE_CARD_FATAL_ERROR = 2,
		GENWQE_CARD_RELOAD_BITSTREAM = 3,
		GENWQE_CARD_STATE_MAX,
		};