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-rw-r--r--arch/powerpc/platforms/pseries/msi.c701
1 files changed, 701 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/msi.c b/arch/powerpc/platforms/pseries/msi.c
new file mode 100644
index 000000000..a3a71d37c
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/msi.c
@@ -0,0 +1,701 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright 2006 Jake Moilanen <moilanen@austin.ibm.com>, IBM Corp.
+ * Copyright 2006-2007 Michael Ellerman, IBM Corp.
+ */
+
+#include <linux/crash_dump.h>
+#include <linux/device.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/msi.h>
+
+#include <asm/rtas.h>
+#include <asm/hw_irq.h>
+#include <asm/ppc-pci.h>
+#include <asm/machdep.h>
+#include <asm/xive.h>
+
+#include "pseries.h"
+
+static int query_token, change_token;
+
+#define RTAS_QUERY_FN 0
+#define RTAS_CHANGE_FN 1
+#define RTAS_RESET_FN 2
+#define RTAS_CHANGE_MSI_FN 3
+#define RTAS_CHANGE_MSIX_FN 4
+#define RTAS_CHANGE_32MSI_FN 5
+
+/* RTAS Helpers */
+
+static int rtas_change_msi(struct pci_dn *pdn, u32 func, u32 num_irqs)
+{
+ u32 addr, seq_num, rtas_ret[3];
+ unsigned long buid;
+ int rc;
+
+ addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);
+ buid = pdn->phb->buid;
+
+ seq_num = 1;
+ do {
+ if (func == RTAS_CHANGE_MSI_FN || func == RTAS_CHANGE_MSIX_FN ||
+ func == RTAS_CHANGE_32MSI_FN)
+ rc = rtas_call(change_token, 6, 4, rtas_ret, addr,
+ BUID_HI(buid), BUID_LO(buid),
+ func, num_irqs, seq_num);
+ else
+ rc = rtas_call(change_token, 6, 3, rtas_ret, addr,
+ BUID_HI(buid), BUID_LO(buid),
+ func, num_irqs, seq_num);
+
+ seq_num = rtas_ret[1];
+ } while (rtas_busy_delay(rc));
+
+ /*
+ * If the RTAS call succeeded, return the number of irqs allocated.
+ * If not, make sure we return a negative error code.
+ */
+ if (rc == 0)
+ rc = rtas_ret[0];
+ else if (rc > 0)
+ rc = -rc;
+
+ pr_debug("rtas_msi: ibm,change_msi(func=%d,num=%d), got %d rc = %d\n",
+ func, num_irqs, rtas_ret[0], rc);
+
+ return rc;
+}
+
+static void rtas_disable_msi(struct pci_dev *pdev)
+{
+ struct pci_dn *pdn;
+
+ pdn = pci_get_pdn(pdev);
+ if (!pdn)
+ return;
+
+ /*
+ * disabling MSI with the explicit interface also disables MSI-X
+ */
+ if (rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, 0) != 0) {
+ /*
+ * may have failed because explicit interface is not
+ * present
+ */
+ if (rtas_change_msi(pdn, RTAS_CHANGE_FN, 0) != 0) {
+ pr_debug("rtas_msi: Setting MSIs to 0 failed!\n");
+ }
+ }
+}
+
+static int rtas_query_irq_number(struct pci_dn *pdn, int offset)
+{
+ u32 addr, rtas_ret[2];
+ unsigned long buid;
+ int rc;
+
+ addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);
+ buid = pdn->phb->buid;
+
+ do {
+ rc = rtas_call(query_token, 4, 3, rtas_ret, addr,
+ BUID_HI(buid), BUID_LO(buid), offset);
+ } while (rtas_busy_delay(rc));
+
+ if (rc) {
+ pr_debug("rtas_msi: error (%d) querying source number\n", rc);
+ return rc;
+ }
+
+ return rtas_ret[0];
+}
+
+static int check_req(struct pci_dev *pdev, int nvec, char *prop_name)
+{
+ struct device_node *dn;
+ const __be32 *p;
+ u32 req_msi;
+
+ dn = pci_device_to_OF_node(pdev);
+
+ p = of_get_property(dn, prop_name, NULL);
+ if (!p) {
+ pr_debug("rtas_msi: No %s on %pOF\n", prop_name, dn);
+ return -ENOENT;
+ }
+
+ req_msi = be32_to_cpup(p);
+ if (req_msi < nvec) {
+ pr_debug("rtas_msi: %s requests < %d MSIs\n", prop_name, nvec);
+
+ if (req_msi == 0) /* Be paranoid */
+ return -ENOSPC;
+
+ return req_msi;
+ }
+
+ return 0;
+}
+
+static int check_req_msi(struct pci_dev *pdev, int nvec)
+{
+ return check_req(pdev, nvec, "ibm,req#msi");
+}
+
+static int check_req_msix(struct pci_dev *pdev, int nvec)
+{
+ return check_req(pdev, nvec, "ibm,req#msi-x");
+}
+
+/* Quota calculation */
+
+static struct device_node *__find_pe_total_msi(struct device_node *node, int *total)
+{
+ struct device_node *dn;
+ const __be32 *p;
+
+ dn = of_node_get(node);
+ while (dn) {
+ p = of_get_property(dn, "ibm,pe-total-#msi", NULL);
+ if (p) {
+ pr_debug("rtas_msi: found prop on dn %pOF\n",
+ dn);
+ *total = be32_to_cpup(p);
+ return dn;
+ }
+
+ dn = of_get_next_parent(dn);
+ }
+
+ return NULL;
+}
+
+static struct device_node *find_pe_total_msi(struct pci_dev *dev, int *total)
+{
+ return __find_pe_total_msi(pci_device_to_OF_node(dev), total);
+}
+
+static struct device_node *find_pe_dn(struct pci_dev *dev, int *total)
+{
+ struct device_node *dn;
+ struct eeh_dev *edev;
+
+ /* Found our PE and assume 8 at that point. */
+
+ dn = pci_device_to_OF_node(dev);
+ if (!dn)
+ return NULL;
+
+ /* Get the top level device in the PE */
+ edev = pdn_to_eeh_dev(PCI_DN(dn));
+ if (edev->pe)
+ edev = list_first_entry(&edev->pe->edevs, struct eeh_dev,
+ entry);
+ dn = pci_device_to_OF_node(edev->pdev);
+ if (!dn)
+ return NULL;
+
+ /* We actually want the parent */
+ dn = of_get_parent(dn);
+ if (!dn)
+ return NULL;
+
+ /* Hardcode of 8 for old firmwares */
+ *total = 8;
+ pr_debug("rtas_msi: using PE dn %pOF\n", dn);
+
+ return dn;
+}
+
+struct msi_counts {
+ struct device_node *requestor;
+ int num_devices;
+ int request;
+ int quota;
+ int spare;
+ int over_quota;
+};
+
+static void *count_non_bridge_devices(struct device_node *dn, void *data)
+{
+ struct msi_counts *counts = data;
+ const __be32 *p;
+ u32 class;
+
+ pr_debug("rtas_msi: counting %pOF\n", dn);
+
+ p = of_get_property(dn, "class-code", NULL);
+ class = p ? be32_to_cpup(p) : 0;
+
+ if ((class >> 8) != PCI_CLASS_BRIDGE_PCI)
+ counts->num_devices++;
+
+ return NULL;
+}
+
+static void *count_spare_msis(struct device_node *dn, void *data)
+{
+ struct msi_counts *counts = data;
+ const __be32 *p;
+ int req;
+
+ if (dn == counts->requestor)
+ req = counts->request;
+ else {
+ /* We don't know if a driver will try to use MSI or MSI-X,
+ * so we just have to punt and use the larger of the two. */
+ req = 0;
+ p = of_get_property(dn, "ibm,req#msi", NULL);
+ if (p)
+ req = be32_to_cpup(p);
+
+ p = of_get_property(dn, "ibm,req#msi-x", NULL);
+ if (p)
+ req = max(req, (int)be32_to_cpup(p));
+ }
+
+ if (req < counts->quota)
+ counts->spare += counts->quota - req;
+ else if (req > counts->quota)
+ counts->over_quota++;
+
+ return NULL;
+}
+
+static int msi_quota_for_device(struct pci_dev *dev, int request)
+{
+ struct device_node *pe_dn;
+ struct msi_counts counts;
+ int total;
+
+ pr_debug("rtas_msi: calc quota for %s, request %d\n", pci_name(dev),
+ request);
+
+ pe_dn = find_pe_total_msi(dev, &total);
+ if (!pe_dn)
+ pe_dn = find_pe_dn(dev, &total);
+
+ if (!pe_dn) {
+ pr_err("rtas_msi: couldn't find PE for %s\n", pci_name(dev));
+ goto out;
+ }
+
+ pr_debug("rtas_msi: found PE %pOF\n", pe_dn);
+
+ memset(&counts, 0, sizeof(struct msi_counts));
+
+ /* Work out how many devices we have below this PE */
+ pci_traverse_device_nodes(pe_dn, count_non_bridge_devices, &counts);
+
+ if (counts.num_devices == 0) {
+ pr_err("rtas_msi: found 0 devices under PE for %s\n",
+ pci_name(dev));
+ goto out;
+ }
+
+ counts.quota = total / counts.num_devices;
+ if (request <= counts.quota)
+ goto out;
+
+ /* else, we have some more calculating to do */
+ counts.requestor = pci_device_to_OF_node(dev);
+ counts.request = request;
+ pci_traverse_device_nodes(pe_dn, count_spare_msis, &counts);
+
+ /* If the quota isn't an integer multiple of the total, we can
+ * use the remainder as spare MSIs for anyone that wants them. */
+ counts.spare += total % counts.num_devices;
+
+ /* Divide any spare by the number of over-quota requestors */
+ if (counts.over_quota)
+ counts.quota += counts.spare / counts.over_quota;
+
+ /* And finally clamp the request to the possibly adjusted quota */
+ request = min(counts.quota, request);
+
+ pr_debug("rtas_msi: request clamped to quota %d\n", request);
+out:
+ of_node_put(pe_dn);
+
+ return request;
+}
+
+static void rtas_hack_32bit_msi_gen2(struct pci_dev *pdev)
+{
+ u32 addr_hi, addr_lo;
+
+ /*
+ * We should only get in here for IODA1 configs. This is based on the
+ * fact that we using RTAS for MSIs, we don't have the 32 bit MSI RTAS
+ * support, and we are in a PCIe Gen2 slot.
+ */
+ dev_info(&pdev->dev,
+ "rtas_msi: No 32 bit MSI firmware support, forcing 32 bit MSI\n");
+ pci_read_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_HI, &addr_hi);
+ addr_lo = 0xffff0000 | ((addr_hi >> (48 - 32)) << 4);
+ pci_write_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_LO, addr_lo);
+ pci_write_config_dword(pdev, pdev->msi_cap + PCI_MSI_ADDRESS_HI, 0);
+}
+
+static int rtas_prepare_msi_irqs(struct pci_dev *pdev, int nvec_in, int type,
+ msi_alloc_info_t *arg)
+{
+ struct pci_dn *pdn;
+ int quota, rc;
+ int nvec = nvec_in;
+ int use_32bit_msi_hack = 0;
+
+ if (type == PCI_CAP_ID_MSIX)
+ rc = check_req_msix(pdev, nvec);
+ else
+ rc = check_req_msi(pdev, nvec);
+
+ if (rc)
+ return rc;
+
+ quota = msi_quota_for_device(pdev, nvec);
+
+ if (quota && quota < nvec)
+ return quota;
+
+ /*
+ * Firmware currently refuse any non power of two allocation
+ * so we round up if the quota will allow it.
+ */
+ if (type == PCI_CAP_ID_MSIX) {
+ int m = roundup_pow_of_two(nvec);
+ quota = msi_quota_for_device(pdev, m);
+
+ if (quota >= m)
+ nvec = m;
+ }
+
+ pdn = pci_get_pdn(pdev);
+
+ /*
+ * Try the new more explicit firmware interface, if that fails fall
+ * back to the old interface. The old interface is known to never
+ * return MSI-Xs.
+ */
+again:
+ if (type == PCI_CAP_ID_MSI) {
+ if (pdev->no_64bit_msi) {
+ rc = rtas_change_msi(pdn, RTAS_CHANGE_32MSI_FN, nvec);
+ if (rc < 0) {
+ /*
+ * We only want to run the 32 bit MSI hack below if
+ * the max bus speed is Gen2 speed
+ */
+ if (pdev->bus->max_bus_speed != PCIE_SPEED_5_0GT)
+ return rc;
+
+ use_32bit_msi_hack = 1;
+ }
+ } else
+ rc = -1;
+
+ if (rc < 0)
+ rc = rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, nvec);
+
+ if (rc < 0) {
+ pr_debug("rtas_msi: trying the old firmware call.\n");
+ rc = rtas_change_msi(pdn, RTAS_CHANGE_FN, nvec);
+ }
+
+ if (use_32bit_msi_hack && rc > 0)
+ rtas_hack_32bit_msi_gen2(pdev);
+ } else
+ rc = rtas_change_msi(pdn, RTAS_CHANGE_MSIX_FN, nvec);
+
+ if (rc != nvec) {
+ if (nvec != nvec_in) {
+ nvec = nvec_in;
+ goto again;
+ }
+ pr_debug("rtas_msi: rtas_change_msi() failed\n");
+ return rc;
+ }
+
+ return 0;
+}
+
+static int pseries_msi_ops_prepare(struct irq_domain *domain, struct device *dev,
+ int nvec, msi_alloc_info_t *arg)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ int type = pdev->msix_enabled ? PCI_CAP_ID_MSIX : PCI_CAP_ID_MSI;
+
+ return rtas_prepare_msi_irqs(pdev, nvec, type, arg);
+}
+
+/*
+ * ->msi_free() is called before irq_domain_free_irqs_top() when the
+ * handler data is still available. Use that to clear the XIVE
+ * controller data.
+ */
+static void pseries_msi_ops_msi_free(struct irq_domain *domain,
+ struct msi_domain_info *info,
+ unsigned int irq)
+{
+ if (xive_enabled())
+ xive_irq_free_data(irq);
+}
+
+/*
+ * RTAS can not disable one MSI at a time. It's all or nothing. Do it
+ * at the end after all IRQs have been freed.
+ */
+static void pseries_msi_domain_free_irqs(struct irq_domain *domain,
+ struct device *dev)
+{
+ if (WARN_ON_ONCE(!dev_is_pci(dev)))
+ return;
+
+ __msi_domain_free_irqs(domain, dev);
+
+ rtas_disable_msi(to_pci_dev(dev));
+}
+
+static struct msi_domain_ops pseries_pci_msi_domain_ops = {
+ .msi_prepare = pseries_msi_ops_prepare,
+ .msi_free = pseries_msi_ops_msi_free,
+ .domain_free_irqs = pseries_msi_domain_free_irqs,
+};
+
+static void pseries_msi_shutdown(struct irq_data *d)
+{
+ d = d->parent_data;
+ if (d->chip->irq_shutdown)
+ d->chip->irq_shutdown(d);
+}
+
+static void pseries_msi_mask(struct irq_data *d)
+{
+ pci_msi_mask_irq(d);
+ irq_chip_mask_parent(d);
+}
+
+static void pseries_msi_unmask(struct irq_data *d)
+{
+ pci_msi_unmask_irq(d);
+ irq_chip_unmask_parent(d);
+}
+
+static void pseries_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct msi_desc *entry = irq_data_get_msi_desc(data);
+
+ /*
+ * Do not update the MSIx vector table. It's not strictly necessary
+ * because the table is initialized by the underlying hypervisor, PowerVM
+ * or QEMU/KVM. However, if the MSIx vector entry is cleared, any further
+ * activation will fail. This can happen in some drivers (eg. IPR) which
+ * deactivate an IRQ used for testing MSI support.
+ */
+ entry->msg = *msg;
+}
+
+static struct irq_chip pseries_pci_msi_irq_chip = {
+ .name = "pSeries-PCI-MSI",
+ .irq_shutdown = pseries_msi_shutdown,
+ .irq_mask = pseries_msi_mask,
+ .irq_unmask = pseries_msi_unmask,
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_write_msi_msg = pseries_msi_write_msg,
+};
+
+
+/*
+ * Set MSI_FLAG_MSIX_CONTIGUOUS as there is no way to express to
+ * firmware to request a discontiguous or non-zero based range of
+ * MSI-X entries. Core code will reject such setup attempts.
+ */
+static struct msi_domain_info pseries_msi_domain_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX |
+ MSI_FLAG_MSIX_CONTIGUOUS),
+ .ops = &pseries_pci_msi_domain_ops,
+ .chip = &pseries_pci_msi_irq_chip,
+};
+
+static void pseries_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ __pci_read_msi_msg(irq_data_get_msi_desc(data), msg);
+}
+
+static struct irq_chip pseries_msi_irq_chip = {
+ .name = "pSeries-MSI",
+ .irq_shutdown = pseries_msi_shutdown,
+ .irq_mask = irq_chip_mask_parent,
+ .irq_unmask = irq_chip_unmask_parent,
+ .irq_eoi = irq_chip_eoi_parent,
+ .irq_set_affinity = irq_chip_set_affinity_parent,
+ .irq_compose_msi_msg = pseries_msi_compose_msg,
+};
+
+static int pseries_irq_parent_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ irq_hw_number_t hwirq)
+{
+ struct irq_fwspec parent_fwspec;
+ int ret;
+
+ parent_fwspec.fwnode = domain->parent->fwnode;
+ parent_fwspec.param_count = 2;
+ parent_fwspec.param[0] = hwirq;
+ parent_fwspec.param[1] = IRQ_TYPE_EDGE_RISING;
+
+ ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int pseries_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *arg)
+{
+ struct pci_controller *phb = domain->host_data;
+ msi_alloc_info_t *info = arg;
+ struct msi_desc *desc = info->desc;
+ struct pci_dev *pdev = msi_desc_to_pci_dev(desc);
+ int hwirq;
+ int i, ret;
+
+ hwirq = rtas_query_irq_number(pci_get_pdn(pdev), desc->msi_index);
+ if (hwirq < 0) {
+ dev_err(&pdev->dev, "Failed to query HW IRQ: %d\n", hwirq);
+ return hwirq;
+ }
+
+ dev_dbg(&pdev->dev, "%s bridge %pOF %d/%x #%d\n", __func__,
+ phb->dn, virq, hwirq, nr_irqs);
+
+ for (i = 0; i < nr_irqs; i++) {
+ ret = pseries_irq_parent_domain_alloc(domain, virq + i, hwirq + i);
+ if (ret)
+ goto out;
+
+ irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
+ &pseries_msi_irq_chip, domain->host_data);
+ }
+
+ return 0;
+
+out:
+ /* TODO: handle RTAS cleanup in ->msi_finish() ? */
+ irq_domain_free_irqs_parent(domain, virq, i - 1);
+ return ret;
+}
+
+static void pseries_irq_domain_free(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs)
+{
+ struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+ struct pci_controller *phb = irq_data_get_irq_chip_data(d);
+
+ pr_debug("%s bridge %pOF %d #%d\n", __func__, phb->dn, virq, nr_irqs);
+
+ /* XIVE domain data is cleared through ->msi_free() */
+}
+
+static const struct irq_domain_ops pseries_irq_domain_ops = {
+ .alloc = pseries_irq_domain_alloc,
+ .free = pseries_irq_domain_free,
+};
+
+static int __pseries_msi_allocate_domains(struct pci_controller *phb,
+ unsigned int count)
+{
+ struct irq_domain *parent = irq_get_default_host();
+
+ phb->fwnode = irq_domain_alloc_named_id_fwnode("pSeries-MSI",
+ phb->global_number);
+ if (!phb->fwnode)
+ return -ENOMEM;
+
+ phb->dev_domain = irq_domain_create_hierarchy(parent, 0, count,
+ phb->fwnode,
+ &pseries_irq_domain_ops, phb);
+ if (!phb->dev_domain) {
+ pr_err("PCI: failed to create IRQ domain bridge %pOF (domain %d)\n",
+ phb->dn, phb->global_number);
+ irq_domain_free_fwnode(phb->fwnode);
+ return -ENOMEM;
+ }
+
+ phb->msi_domain = pci_msi_create_irq_domain(of_node_to_fwnode(phb->dn),
+ &pseries_msi_domain_info,
+ phb->dev_domain);
+ if (!phb->msi_domain) {
+ pr_err("PCI: failed to create MSI IRQ domain bridge %pOF (domain %d)\n",
+ phb->dn, phb->global_number);
+ irq_domain_free_fwnode(phb->fwnode);
+ irq_domain_remove(phb->dev_domain);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+int pseries_msi_allocate_domains(struct pci_controller *phb)
+{
+ int count;
+
+ if (!__find_pe_total_msi(phb->dn, &count)) {
+ pr_err("PCI: failed to find MSIs for bridge %pOF (domain %d)\n",
+ phb->dn, phb->global_number);
+ return -ENOSPC;
+ }
+
+ return __pseries_msi_allocate_domains(phb, count);
+}
+
+void pseries_msi_free_domains(struct pci_controller *phb)
+{
+ if (phb->msi_domain)
+ irq_domain_remove(phb->msi_domain);
+ if (phb->dev_domain)
+ irq_domain_remove(phb->dev_domain);
+ if (phb->fwnode)
+ irq_domain_free_fwnode(phb->fwnode);
+}
+
+static void rtas_msi_pci_irq_fixup(struct pci_dev *pdev)
+{
+ /* No LSI -> leave MSIs (if any) configured */
+ if (!pdev->irq) {
+ dev_dbg(&pdev->dev, "rtas_msi: no LSI, nothing to do.\n");
+ return;
+ }
+
+ /* No MSI -> MSIs can't have been assigned by fw, leave LSI */
+ if (check_req_msi(pdev, 1) && check_req_msix(pdev, 1)) {
+ dev_dbg(&pdev->dev, "rtas_msi: no req#msi/x, nothing to do.\n");
+ return;
+ }
+
+ dev_dbg(&pdev->dev, "rtas_msi: disabling existing MSI.\n");
+ rtas_disable_msi(pdev);
+}
+
+static int rtas_msi_init(void)
+{
+ query_token = rtas_token("ibm,query-interrupt-source-number");
+ change_token = rtas_token("ibm,change-msi");
+
+ if ((query_token == RTAS_UNKNOWN_SERVICE) ||
+ (change_token == RTAS_UNKNOWN_SERVICE)) {
+ pr_debug("rtas_msi: no RTAS tokens, no MSI support.\n");
+ return -1;
+ }
+
+ pr_debug("rtas_msi: Registering RTAS MSI callbacks.\n");
+
+ WARN_ON(ppc_md.pci_irq_fixup);
+ ppc_md.pci_irq_fixup = rtas_msi_pci_irq_fixup;
+
+ return 0;
+}
+machine_arch_initcall(pseries, rtas_msi_init);