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authorAndra Paraschiv <andraprs@amazon.com>2020-09-21 15:17:19 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-09-22 14:58:40 +0300
commitad2b6980d0d3c7707de084f12d75f673af5fd017 (patch)
treead9436805cc0f613e53fce208341ae98b7256fd7 /drivers/virt
parent89308c11ae3ba38255cd7716809437576551561b (diff)
downloadlinux-ad2b6980d0d3c7707de084f12d75f673af5fd017.tar.xz
nitro_enclaves: Handle PCI device command requests
The Nitro Enclaves PCI device exposes a MMIO space that this driver uses to submit command requests and to receive command replies e.g. for enclave creation / termination or setting enclave resources. Add logic for handling PCI device command requests based on the given command type. Register an MSI-X interrupt vector for command reply notifications to handle this type of communication events. Changelog v9 -> v10 * Update commit message to include the changelog before the SoB tag(s). v8 -> v9 * No changes. v7 -> v8 * Update function signature for submit request and retrive reply functions as they only returned 0, no error code. * Include command type value in the error logs of ne_do_request(). v6 -> v7 * No changes. v5 -> v6 * Update documentation to kernel-doc format. v4 -> v5 * Remove sanity checks for situations that shouldn't happen, only if buggy system or broken logic at all. v3 -> v4 * Use dev_err instead of custom NE log pattern. * Return IRQ_NONE when interrupts are not handled. v2 -> v3 * Remove the WARN_ON calls. * Update static calls sanity checks. * Remove "ratelimited" from the logs that are not in the ioctl call paths. v1 -> v2 * Add log pattern for NE. * Remove the BUG_ON calls. * Update goto labels to match their purpose. * Add fix for kbuild report: https://lore.kernel.org/lkml/202004231644.xTmN4Z1z%25lkp@intel.com/ Reviewed-by: Alexander Graf <graf@amazon.com> Signed-off-by: Alexandru-Catalin Vasile <lexnv@amazon.com> Signed-off-by: Andra Paraschiv <andraprs@amazon.com> Link: https://lore.kernel.org/r/20200921121732.44291-6-andraprs@amazon.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/virt')
-rw-r--r--drivers/virt/nitro_enclaves/ne_pci_dev.c189
1 files changed, 189 insertions, 0 deletions
diff --git a/drivers/virt/nitro_enclaves/ne_pci_dev.c b/drivers/virt/nitro_enclaves/ne_pci_dev.c
index 32f07345c3b5..cedc4dd2dd39 100644
--- a/drivers/virt/nitro_enclaves/ne_pci_dev.c
+++ b/drivers/virt/nitro_enclaves/ne_pci_dev.c
@@ -34,6 +34,172 @@ static const struct pci_device_id ne_pci_ids[] = {
MODULE_DEVICE_TABLE(pci, ne_pci_ids);
/**
+ * ne_submit_request() - Submit command request to the PCI device based on the
+ * command type.
+ * @pdev: PCI device to send the command to.
+ * @cmd_type: Command type of the request sent to the PCI device.
+ * @cmd_request: Command request payload.
+ * @cmd_request_size: Size of the command request payload.
+ *
+ * Context: Process context. This function is called with the ne_pci_dev mutex held.
+ */
+static void ne_submit_request(struct pci_dev *pdev, enum ne_pci_dev_cmd_type cmd_type,
+ void *cmd_request, size_t cmd_request_size)
+{
+ struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev);
+
+ memcpy_toio(ne_pci_dev->iomem_base + NE_SEND_DATA, cmd_request, cmd_request_size);
+
+ iowrite32(cmd_type, ne_pci_dev->iomem_base + NE_COMMAND);
+}
+
+/**
+ * ne_retrieve_reply() - Retrieve reply from the PCI device.
+ * @pdev: PCI device to receive the reply from.
+ * @cmd_reply: Command reply payload.
+ * @cmd_reply_size: Size of the command reply payload.
+ *
+ * Context: Process context. This function is called with the ne_pci_dev mutex held.
+ */
+static void ne_retrieve_reply(struct pci_dev *pdev, struct ne_pci_dev_cmd_reply *cmd_reply,
+ size_t cmd_reply_size)
+{
+ struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev);
+
+ memcpy_fromio(cmd_reply, ne_pci_dev->iomem_base + NE_RECV_DATA, cmd_reply_size);
+}
+
+/**
+ * ne_wait_for_reply() - Wait for a reply of a PCI device command.
+ * @pdev: PCI device for which a reply is waited.
+ *
+ * Context: Process context. This function is called with the ne_pci_dev mutex held.
+ * Return:
+ * * 0 on success.
+ * * Negative return value on failure.
+ */
+static int ne_wait_for_reply(struct pci_dev *pdev)
+{
+ struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev);
+ int rc = -EINVAL;
+
+ /*
+ * TODO: Update to _interruptible and handle interrupted wait event
+ * e.g. -ERESTARTSYS, incoming signals + update timeout, if needed.
+ */
+ rc = wait_event_timeout(ne_pci_dev->cmd_reply_wait_q,
+ atomic_read(&ne_pci_dev->cmd_reply_avail) != 0,
+ msecs_to_jiffies(NE_DEFAULT_TIMEOUT_MSECS));
+ if (!rc)
+ return -ETIMEDOUT;
+
+ return 0;
+}
+
+int ne_do_request(struct pci_dev *pdev, enum ne_pci_dev_cmd_type cmd_type,
+ void *cmd_request, size_t cmd_request_size,
+ struct ne_pci_dev_cmd_reply *cmd_reply, size_t cmd_reply_size)
+{
+ struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev);
+ int rc = -EINVAL;
+
+ if (cmd_type <= INVALID_CMD || cmd_type >= MAX_CMD) {
+ dev_err_ratelimited(&pdev->dev, "Invalid cmd type=%u\n", cmd_type);
+
+ return -EINVAL;
+ }
+
+ if (!cmd_request) {
+ dev_err_ratelimited(&pdev->dev, "Null cmd request for cmd type=%u\n",
+ cmd_type);
+
+ return -EINVAL;
+ }
+
+ if (cmd_request_size > NE_SEND_DATA_SIZE) {
+ dev_err_ratelimited(&pdev->dev, "Invalid req size=%zu for cmd type=%u\n",
+ cmd_request_size, cmd_type);
+
+ return -EINVAL;
+ }
+
+ if (!cmd_reply) {
+ dev_err_ratelimited(&pdev->dev, "Null cmd reply for cmd type=%u\n",
+ cmd_type);
+
+ return -EINVAL;
+ }
+
+ if (cmd_reply_size > NE_RECV_DATA_SIZE) {
+ dev_err_ratelimited(&pdev->dev, "Invalid reply size=%zu for cmd type=%u\n",
+ cmd_reply_size, cmd_type);
+
+ return -EINVAL;
+ }
+
+ /*
+ * Use this mutex so that the PCI device handles one command request at
+ * a time.
+ */
+ mutex_lock(&ne_pci_dev->pci_dev_mutex);
+
+ atomic_set(&ne_pci_dev->cmd_reply_avail, 0);
+
+ ne_submit_request(pdev, cmd_type, cmd_request, cmd_request_size);
+
+ rc = ne_wait_for_reply(pdev);
+ if (rc < 0) {
+ dev_err_ratelimited(&pdev->dev, "Error in wait for reply for cmd type=%u [rc=%d]\n",
+ cmd_type, rc);
+
+ goto unlock_mutex;
+ }
+
+ ne_retrieve_reply(pdev, cmd_reply, cmd_reply_size);
+
+ atomic_set(&ne_pci_dev->cmd_reply_avail, 0);
+
+ if (cmd_reply->rc < 0) {
+ rc = cmd_reply->rc;
+
+ dev_err_ratelimited(&pdev->dev, "Error in cmd process logic, cmd type=%u [rc=%d]\n",
+ cmd_type, rc);
+
+ goto unlock_mutex;
+ }
+
+ rc = 0;
+
+unlock_mutex:
+ mutex_unlock(&ne_pci_dev->pci_dev_mutex);
+
+ return rc;
+}
+
+/**
+ * ne_reply_handler() - Interrupt handler for retrieving a reply matching a
+ * request sent to the PCI device for enclave lifetime
+ * management.
+ * @irq: Received interrupt for a reply sent by the PCI device.
+ * @args: PCI device private data structure.
+ *
+ * Context: Interrupt context.
+ * Return:
+ * * IRQ_HANDLED on handled interrupt.
+ */
+static irqreturn_t ne_reply_handler(int irq, void *args)
+{
+ struct ne_pci_dev *ne_pci_dev = (struct ne_pci_dev *)args;
+
+ atomic_set(&ne_pci_dev->cmd_reply_avail, 1);
+
+ /* TODO: Update to _interruptible. */
+ wake_up(&ne_pci_dev->cmd_reply_wait_q);
+
+ return IRQ_HANDLED;
+}
+
+/**
* ne_setup_msix() - Setup MSI-X vectors for the PCI device.
* @pdev: PCI device to setup the MSI-X for.
*
@@ -44,6 +210,7 @@ MODULE_DEVICE_TABLE(pci, ne_pci_ids);
*/
static int ne_setup_msix(struct pci_dev *pdev)
{
+ struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev);
int nr_vecs = 0;
int rc = -EINVAL;
@@ -63,7 +230,25 @@ static int ne_setup_msix(struct pci_dev *pdev)
return rc;
}
+ /*
+ * This IRQ gets triggered every time the PCI device responds to a
+ * command request. The reply is then retrieved, reading from the MMIO
+ * space of the PCI device.
+ */
+ rc = request_irq(pci_irq_vector(pdev, NE_VEC_REPLY), ne_reply_handler,
+ 0, "enclave_cmd", ne_pci_dev);
+ if (rc < 0) {
+ dev_err(&pdev->dev, "Error in request irq reply [rc=%d]\n", rc);
+
+ goto free_irq_vectors;
+ }
+
return 0;
+
+free_irq_vectors:
+ pci_free_irq_vectors(pdev);
+
+ return rc;
}
/**
@@ -74,6 +259,10 @@ static int ne_setup_msix(struct pci_dev *pdev)
*/
static void ne_teardown_msix(struct pci_dev *pdev)
{
+ struct ne_pci_dev *ne_pci_dev = pci_get_drvdata(pdev);
+
+ free_irq(pci_irq_vector(pdev, NE_VEC_REPLY), ne_pci_dev);
+
pci_free_irq_vectors(pdev);
}