cxl: sysfs support for guests
Filter out a few adapter parameters which don't make sense in a guest. Document the changes. Co-authored-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com> Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com> Reviewed-by: Manoj Kumar <manoj@linux.vnet.ibm.com> Acked-by: Ian Munsie <imunsie@au1.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
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@ -159,7 +159,7 @@ Description: read only
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Decimal value of the Per Process MMIO space length.
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Users: https://github.com/ibm-capi/libcxl
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What: /sys/class/cxl/<afu>m/pp_mmio_off
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What: /sys/class/cxl/<afu>m/pp_mmio_off (not in a guest)
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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@ -183,7 +183,7 @@ Description: read only
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Identifies the revision level of the PSL.
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Users: https://github.com/ibm-capi/libcxl
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What: /sys/class/cxl/<card>/base_image
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What: /sys/class/cxl/<card>/base_image (not in a guest)
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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@ -193,7 +193,7 @@ Description: read only
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during the initial program load.
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Users: https://github.com/ibm-capi/libcxl
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What: /sys/class/cxl/<card>/image_loaded
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What: /sys/class/cxl/<card>/image_loaded (not in a guest)
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Date: September 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read only
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@ -201,7 +201,7 @@ Description: read only
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onto the card.
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Users: https://github.com/ibm-capi/libcxl
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What: /sys/class/cxl/<card>/load_image_on_perst
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What: /sys/class/cxl/<card>/load_image_on_perst (not in a guest)
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Date: December 2014
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read/write
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@ -224,7 +224,7 @@ Description: write only
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to reload the FPGA depending on load_image_on_perst.
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Users: https://github.com/ibm-capi/libcxl
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What: /sys/class/cxl/<card>/perst_reloads_same_image
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What: /sys/class/cxl/<card>/perst_reloads_same_image (not in a guest)
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Date: July 2015
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Contact: linuxppc-dev@lists.ozlabs.org
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Description: read/write
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@ -336,6 +336,12 @@ enum prefault_modes {
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CXL_PREFAULT_ALL,
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};
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enum cxl_attrs {
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CXL_ADAPTER_ATTRS,
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CXL_AFU_MASTER_ATTRS,
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CXL_AFU_ATTRS,
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};
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struct cxl_sste {
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__be64 esid_data;
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__be64 vsid_data;
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@ -844,6 +850,7 @@ struct cxl_backend_ops {
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int (*attach_process)(struct cxl_context *ctx, bool kernel,
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u64 wed, u64 amr);
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int (*detach_process)(struct cxl_context *ctx);
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bool (*support_attributes)(const char *attr_name, enum cxl_attrs type);
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bool (*link_ok)(struct cxl *cxl);
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void (*release_afu)(struct device *dev);
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ssize_t (*afu_read_err_buffer)(struct cxl_afu *afu, char *buf,
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@ -596,6 +596,30 @@ static int guest_afu_check_and_enable(struct cxl_afu *afu)
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return 0;
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}
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static bool guest_support_attributes(const char *attr_name,
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enum cxl_attrs type)
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{
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switch (type) {
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case CXL_ADAPTER_ATTRS:
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if ((strcmp(attr_name, "base_image") == 0) ||
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(strcmp(attr_name, "load_image_on_perst") == 0) ||
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(strcmp(attr_name, "perst_reloads_same_image") == 0) ||
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(strcmp(attr_name, "image_loaded") == 0))
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return false;
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break;
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case CXL_AFU_MASTER_ATTRS:
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if ((strcmp(attr_name, "pp_mmio_off") == 0))
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return false;
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break;
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case CXL_AFU_ATTRS:
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break;
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default:
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break;
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}
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return true;
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}
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static int activate_afu_directed(struct cxl_afu *afu)
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{
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int rc;
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@ -936,6 +960,7 @@ const struct cxl_backend_ops cxl_guest_ops = {
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.ack_irq = guest_ack_irq,
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.attach_process = guest_attach_process,
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.detach_process = guest_detach_process,
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.support_attributes = guest_support_attributes,
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.link_ok = guest_link_ok,
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.release_afu = guest_release_afu,
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.afu_read_err_buffer = guest_afu_read_err_buffer,
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@ -967,6 +967,12 @@ int cxl_check_error(struct cxl_afu *afu)
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return (cxl_p1n_read(afu, CXL_PSL_SCNTL_An) == ~0ULL);
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}
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static bool native_support_attributes(const char *attr_name,
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enum cxl_attrs type)
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{
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return true;
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}
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static int native_afu_cr_read64(struct cxl_afu *afu, int cr, u64 off, u64 *out)
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{
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if (unlikely(!cxl_ops->link_ok(afu->adapter)))
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@ -1026,6 +1032,7 @@ const struct cxl_backend_ops cxl_native_ops = {
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.ack_irq = native_ack_irq,
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.attach_process = native_attach_process,
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.detach_process = native_detach_process,
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.support_attributes = native_support_attributes,
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.link_ok = cxl_adapter_link_ok,
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.release_afu = cxl_pci_release_afu,
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.afu_read_err_buffer = cxl_pci_afu_read_err_buffer,
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@ -253,8 +253,14 @@ static ssize_t irqs_max_store(struct device *device,
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if (irqs_max < afu->pp_irqs)
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return -EINVAL;
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if (irqs_max > afu->adapter->user_irqs)
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return -EINVAL;
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if (cpu_has_feature(CPU_FTR_HVMODE)) {
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if (irqs_max > afu->adapter->user_irqs)
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return -EINVAL;
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} else {
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/* pHyp sets a per-AFU limit */
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if (irqs_max > afu->guest->max_ints)
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return -EINVAL;
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}
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afu->irqs_max = irqs_max;
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return count;
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@ -406,24 +412,39 @@ static struct device_attribute afu_attrs[] = {
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int cxl_sysfs_adapter_add(struct cxl *adapter)
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{
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struct device_attribute *dev_attr;
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int i, rc;
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for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
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if ((rc = device_create_file(&adapter->dev, &adapter_attrs[i])))
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goto err;
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dev_attr = &adapter_attrs[i];
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if (cxl_ops->support_attributes(dev_attr->attr.name,
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CXL_ADAPTER_ATTRS)) {
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if ((rc = device_create_file(&adapter->dev, dev_attr)))
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goto err;
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}
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}
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return 0;
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err:
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for (i--; i >= 0; i--)
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device_remove_file(&adapter->dev, &adapter_attrs[i]);
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for (i--; i >= 0; i--) {
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dev_attr = &adapter_attrs[i];
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if (cxl_ops->support_attributes(dev_attr->attr.name,
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CXL_ADAPTER_ATTRS))
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device_remove_file(&adapter->dev, dev_attr);
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}
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return rc;
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}
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void cxl_sysfs_adapter_remove(struct cxl *adapter)
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{
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struct device_attribute *dev_attr;
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int i;
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for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++)
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device_remove_file(&adapter->dev, &adapter_attrs[i]);
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for (i = 0; i < ARRAY_SIZE(adapter_attrs); i++) {
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dev_attr = &adapter_attrs[i];
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if (cxl_ops->support_attributes(dev_attr->attr.name,
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CXL_ADAPTER_ATTRS))
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device_remove_file(&adapter->dev, dev_attr);
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}
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}
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struct afu_config_record {
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/*
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* Export raw AFU PCIe like config record. For now this is read only by
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* root - we can expand that later to be readable by non-root and maybe
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* even writable provided we have a good use-case. Once we suport
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* even writable provided we have a good use-case. Once we support
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* exposing AFUs through a virtual PHB they will get that for free from
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* Linux' PCI infrastructure, but until then it's not clear that we
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* need it for anything since the main use case is just identifying
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void cxl_sysfs_afu_remove(struct cxl_afu *afu)
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{
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struct device_attribute *dev_attr;
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struct afu_config_record *cr, *tmp;
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int i;
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if (afu->eb_len)
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device_remove_bin_file(&afu->dev, &afu->attr_eb);
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for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
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device_remove_file(&afu->dev, &afu_attrs[i]);
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for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
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dev_attr = &afu_attrs[i];
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if (cxl_ops->support_attributes(dev_attr->attr.name,
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CXL_AFU_ATTRS))
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device_remove_file(&afu->dev, &afu_attrs[i]);
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}
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list_for_each_entry_safe(cr, tmp, &afu->crs, list) {
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sysfs_remove_bin_file(&cr->kobj, &cr->config_attr);
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int cxl_sysfs_afu_add(struct cxl_afu *afu)
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{
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struct device_attribute *dev_attr;
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struct afu_config_record *cr;
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int i, rc;
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INIT_LIST_HEAD(&afu->crs);
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for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
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if ((rc = device_create_file(&afu->dev, &afu_attrs[i])))
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goto err;
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dev_attr = &afu_attrs[i];
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if (cxl_ops->support_attributes(dev_attr->attr.name,
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CXL_AFU_ATTRS)) {
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if ((rc = device_create_file(&afu->dev, &afu_attrs[i])))
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goto err;
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}
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}
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/* conditionally create the add the binary file for error info buffer */
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/* reset the eb_len as we havent created the bin attr */
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afu->eb_len = 0;
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for (i--; i >= 0; i--)
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for (i--; i >= 0; i--) {
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dev_attr = &afu_attrs[i];
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if (cxl_ops->support_attributes(dev_attr->attr.name,
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CXL_AFU_ATTRS))
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device_remove_file(&afu->dev, &afu_attrs[i]);
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}
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return rc;
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}
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int cxl_sysfs_afu_m_add(struct cxl_afu *afu)
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{
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struct device_attribute *dev_attr;
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int i, rc;
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for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) {
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if ((rc = device_create_file(afu->chardev_m, &afu_master_attrs[i])))
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goto err;
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dev_attr = &afu_master_attrs[i];
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if (cxl_ops->support_attributes(dev_attr->attr.name,
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CXL_AFU_MASTER_ATTRS)) {
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if ((rc = device_create_file(afu->chardev_m, &afu_master_attrs[i])))
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goto err;
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}
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}
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return 0;
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err:
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for (i--; i >= 0; i--)
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device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
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for (i--; i >= 0; i--) {
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dev_attr = &afu_master_attrs[i];
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if (cxl_ops->support_attributes(dev_attr->attr.name,
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CXL_AFU_MASTER_ATTRS))
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device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
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}
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return rc;
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}
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void cxl_sysfs_afu_m_remove(struct cxl_afu *afu)
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{
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struct device_attribute *dev_attr;
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int i;
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for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++)
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device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
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for (i = 0; i < ARRAY_SIZE(afu_master_attrs); i++) {
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dev_attr = &afu_master_attrs[i];
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if (cxl_ops->support_attributes(dev_attr->attr.name,
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CXL_AFU_MASTER_ATTRS))
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device_remove_file(afu->chardev_m, &afu_master_attrs[i]);
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}
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}
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