libpayload/storage: Add NVMe driver

Tested with qemu virtual NVMe and Intel hardware. Works with FILO.

Change-Id: Ie75b1dc743dac3426c230c57ee23b771ba3a6e0c
Signed-off-by: Thomas Heijligen <thomas.heijligen@secunet.com>
Signed-off-by: Nico Huber <nico.huber@secunet.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/33582
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 403 insertions, 0 deletions

diff --git a/payloads/libpayload/drivers/storage/nvme.c b/payloads/libpayload/drivers/storage/nvme.c
new file mode 100644
index 0000000000..8d6f409646
--- /dev/null
+++ b/payloads/libpayload/drivers/storage/nvme.c
@@ -0,0 +1,403 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Libpayload NVMe device driver
+ * Copyright (C) 2019 secunet Security Networks AG
+ */
+
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <pci.h>
+#include <pci/pci.h>
+#include <libpayload.h>
+#include <storage/storage.h>
+#include <storage/nvme.h>
+
+#define NVME_CC_EN	(1 <<  0)
+#define NVME_CC_CSS	(0 <<  4)
+#define NVME_CC_MPS	(0 <<  7)
+#define NVME_CC_AMS	(0 << 11)
+#define NVME_CC_SHN	(0 << 14)
+#define NVME_CC_IOSQES	(6 << 16)
+#define NVME_CC_IOCQES	(4 << 20)
+
+#define NVME_QUEUE_SIZE 2
+#define NVME_SQ_ENTRY_SIZE 64
+#define NVME_CQ_ENTRY_SIZE 16
+
+struct nvme_dev {
+	storage_dev_t storage_dev;
+
+	pcidev_t pci_dev;
+	void *config;
+	struct {
+		void *base;
+		uint32_t *bell;
+		uint16_t idx; // bool pos 0 or 1
+		uint16_t round; // bool round 0 or 1+0xd
+	} queue[4];
+
+	uint64_t *prp_list;
+};
+
+
+struct nvme_s_queue_entry {
+	uint32_t dw[16];
+};
+
+struct nvme_c_queue_entry {
+	uint32_t dw[4];
+};
+
+enum nvme_queue {
+	NVME_ADMIN_QUEUE = 0,
+	ads = 0,
+	adc = 1,
+	NVME_IO_QUEUE = 2,
+	ios = 2,
+	ioc = 3,
+};
+
+static storage_poll_t nvme_poll(struct storage_dev *dev)
+{
+	return POLL_MEDIUM_PRESENT;
+}
+
+static int nvme_cmd(
+		struct nvme_dev *nvme, enum nvme_queue q, const struct nvme_s_queue_entry *cmd)
+{
+	int sq = q, cq = q+1;
+
+	void *s_entry = nvme->queue[sq].base + (nvme->queue[sq].idx * NVME_SQ_ENTRY_SIZE);
+	memcpy(s_entry, cmd, NVME_SQ_ENTRY_SIZE);
+	nvme->queue[sq].idx = (nvme->queue[sq].idx + 1) & (NVME_QUEUE_SIZE - 1);
+	write32(nvme->queue[sq].bell, nvme->queue[sq].idx);
+
+	struct nvme_c_queue_entry *c_entry = nvme->queue[cq].base +
+		(nvme->queue[cq].idx * NVME_CQ_ENTRY_SIZE);
+	while (((read32(&c_entry->dw[3]) >> 16) & 0x1) == nvme->queue[cq].round)
+		;
+	nvme->queue[cq].idx = (nvme->queue[cq].idx + 1) & (NVME_QUEUE_SIZE - 1);
+	write32(nvme->queue[cq].bell, nvme->queue[cq].idx);
+	if (nvme->queue[cq].idx == 0)
+		nvme->queue[cq].round = (nvme->queue[cq].round + 1) & 1;
+	return c_entry->dw[3] >> 17;
+}
+
+static int delete_io_submission_queue(struct nvme_dev *nvme)
+{
+	const struct nvme_s_queue_entry e = {
+		.dw[0]  = 0,
+		.dw[10] = ios,
+	};
+
+	int res = nvme_cmd(nvme, NVME_ADMIN_QUEUE, &e);
+
+	free(nvme->queue[ios].base);
+	nvme->queue[ios].base = NULL;
+	nvme->queue[ios].bell = NULL;
+	nvme->queue[ios].idx  = 0;
+	return res;
+}
+
+static int delete_io_completion_queue(struct nvme_dev *nvme)
+{
+	const struct nvme_s_queue_entry e = {
+		.dw[0]  = 1,
+		.dw[10] = ioc,
+	};
+
+	int res = nvme_cmd(nvme, NVME_ADMIN_QUEUE, &e);
+	free(nvme->queue[ioc].base);
+
+	nvme->queue[ioc].base  = NULL;
+	nvme->queue[ioc].bell  = NULL;
+	nvme->queue[ioc].idx   = 0;
+	nvme->queue[ioc].round = 0;
+	return res;
+}
+
+static int delete_admin_queues(struct nvme_dev *nvme)
+{
+	if (nvme->queue[ios].base || nvme->queue[ioc].base)
+		printf("NVMe ERROR: IO queues still active.\n");
+
+	free(nvme->queue[ads].base);
+	nvme->queue[ads].base = NULL;
+	nvme->queue[ads].bell = NULL;
+	nvme->queue[ads].idx  = 0;
+
+	free(nvme->queue[adc].base);
+	nvme->queue[adc].base = NULL;
+	nvme->queue[adc].bell = NULL;
+	nvme->queue[adc].idx  = 0;
+	nvme->queue[adc].round = 0;
+
+	return 0;
+}
+
+static void nvme_detach_device(struct storage_dev *dev)
+{
+	struct nvme_dev *nvme = (struct nvme_dev *)dev;
+
+	if (delete_io_submission_queue(nvme))
+		printf("NVMe ERROR: Failed to delete io submission queue\n");
+	if (delete_io_completion_queue(nvme))
+		printf("NVME ERROR: Failed to delete io completion queue\n");
+	if (delete_admin_queues(nvme))
+		printf("NVME ERROR: Failed to delete admin queues\n");
+
+	write32(nvme->config + 0x1c, 0);
+
+	int status, timeout = (read64(nvme->config) >> 24 & 0xff) * 500;
+	do {
+		status = read32(nvme->config + 0x1c) & 0x3;
+		if (status == 0x2) {
+			printf("NVMe ERROR: Failed to disable controller. FATAL ERROR\n");
+			break;
+		}
+		if (timeout < 0) {
+			printf("NVMe ERROR: Failed to disable controller. Timeout.\n");
+			break;
+		}
+		timeout -= 10;
+		mdelay(10);
+	} while (status != 0x0);
+
+	uint16_t command = pci_read_config16(nvme->pci_dev, PCI_COMMAND);
+	pci_write_config16(nvme->pci_dev, PCI_COMMAND, command & ~PCI_COMMAND_MASTER);
+
+	free(nvme->prp_list);
+}
+
+static int nvme_read(struct nvme_dev *nvme, unsigned char *buffer, uint64_t base, uint16_t count)
+{
+	if (count == 0 || count > 512)
+		return -1;
+
+	struct nvme_s_queue_entry e = {
+		.dw[0] = 0x02,
+		.dw[1] = 0x1,
+		.dw[6] = virt_to_phys(buffer),
+		.dw[10] = base,
+		.dw[11] = base >> 32,
+		.dw[12] = count - 1,
+	};
+
+	const unsigned int start_page = (uintptr_t)buffer >> 12;
+	const unsigned int end_page = ((uintptr_t)buffer + count * 512 - 1) >> 12;
+	if (end_page == start_page) {
+		/* No page crossing, PRP2 is reserved */
+	} else if (end_page == start_page + 1) {
+		/* Crossing exactly one page boundary, PRP2 is second page */
+		e.dw[8] = virt_to_phys(buffer + 0x1000) & ~0xfff;
+	} else {
+		/* Use a single page as PRP list, PRP2 points to the list */
+		unsigned int i;
+		for (i = 0; i < end_page - start_page; ++i) {
+			buffer += 0x1000;
+			nvme->prp_list[i] = virt_to_phys(buffer) & ~0xfff;
+		}
+		e.dw[8] = virt_to_phys(nvme->prp_list);
+	}
+
+	return nvme_cmd(nvme, ios, &e);
+}
+
+static ssize_t nvme_read_blocks512(
+		struct storage_dev *const dev,
+		const lba_t start, const size_t count, unsigned char *const buf)
+{
+	unsigned int off = 0;
+	while (off < count) {
+		const unsigned int blocks = MIN(count - off, 512);
+		if (nvme_read((struct nvme_dev *)dev, buf + (off * 512), start + off, blocks))
+			return off;
+		off += blocks;
+	}
+	return count;
+}
+
+static int create_io_submission_queue(struct nvme_dev *nvme)
+{
+	void *sq_buffer = memalign(0x1000, NVME_SQ_ENTRY_SIZE * NVME_QUEUE_SIZE);
+	if (!sq_buffer) {
+		printf("NVMe ERROR: Failed to allocate memory for io submission queue.\n");
+		return -1;
+	}
+	memset(sq_buffer, 0, NVME_SQ_ENTRY_SIZE * NVME_QUEUE_SIZE);
+
+	struct nvme_s_queue_entry e = {
+		.dw[0]  = 0x01,
+		.dw[6]  = virt_to_phys(sq_buffer),
+		.dw[10] = ((NVME_QUEUE_SIZE - 1) << 16) | ios >> 1,
+		.dw[11] = (1 << 16) | 1,
+	};
+
+	int res = nvme_cmd(nvme, NVME_ADMIN_QUEUE, &e);
+	if (res) {
+		printf("NVMe ERROR: nvme_cmd returned with %i.\n", res);
+		free(sq_buffer);
+		return res;
+	}
+
+	uint8_t cap_dstrd = (read64(nvme->config) >> 32) & 0xf;
+	nvme->queue[ios].base = sq_buffer;
+	nvme->queue[ios].bell = nvme->config + 0x1000 + (ios * (4 << cap_dstrd));
+	nvme->queue[ios].idx = 0;
+	return 0;
+}
+
+static int create_io_completion_queue(struct nvme_dev *nvme)
+{
+	void *const cq_buffer = memalign(0x1000, NVME_CQ_ENTRY_SIZE * NVME_QUEUE_SIZE);
+	if (!cq_buffer) {
+		printf("NVMe ERROR: Failed to allocate memory for io completion queue.\n");
+		return -1;
+	}
+	memset(cq_buffer, 0, NVME_CQ_ENTRY_SIZE * NVME_QUEUE_SIZE);
+
+	const struct nvme_s_queue_entry e = {
+		.dw[0]  = 0x05,
+		.dw[6]  = virt_to_phys(cq_buffer),
+		.dw[10] = ((NVME_QUEUE_SIZE - 1) << 16) | ioc >> 1,
+		.dw[11] = 1,
+	};
+
+	int res = nvme_cmd(nvme, NVME_ADMIN_QUEUE, &e);
+	if (res) {
+		printf("NVMe ERROR: nvme_cmd returned with %i.\n", res);
+		free(cq_buffer);
+		return res;
+	}
+
+	uint8_t cap_dstrd = (read64(nvme->config) >> 32) & 0xf;
+	nvme->queue[ioc].base  = cq_buffer;
+	nvme->queue[ioc].bell  = nvme->config + 0x1000 + (ioc * (4 << cap_dstrd));
+	nvme->queue[ioc].idx   = 0;
+	nvme->queue[ioc].round = 0;
+
+	return 0;
+}
+
+static int create_admin_queues(struct nvme_dev *nvme)
+{
+	uint8_t cap_dstrd = (read64(nvme->config) >> 32) & 0xf;
+	write32(nvme->config + 0x24, (NVME_QUEUE_SIZE - 1) << 16 | (NVME_QUEUE_SIZE - 1));
+
+	void *sq_buffer = memalign(0x1000, NVME_SQ_ENTRY_SIZE * NVME_QUEUE_SIZE);
+	if (!sq_buffer) {
+		printf("NVMe ERROR: Failed to allocated memory for admin submission queue\n");
+		return -1;
+	}
+	memset(sq_buffer, 0, NVME_SQ_ENTRY_SIZE * NVME_QUEUE_SIZE);
+	write64(nvme->config + 0x28, virt_to_phys(sq_buffer));
+
+	nvme->queue[ads].base = sq_buffer;
+	nvme->queue[ads].bell = nvme->config + 0x1000 + (ads * (4 << cap_dstrd));
+	nvme->queue[ads].idx = 0;
+
+	void *cq_buffer = memalign(0x1000, NVME_CQ_ENTRY_SIZE * NVME_QUEUE_SIZE);
+	if (!cq_buffer) {
+		printf("NVMe ERROR: Failed to allocate memory for admin completion queue\n");
+		free(cq_buffer);
+		return -1;
+	}
+	memset(cq_buffer, 0, NVME_CQ_ENTRY_SIZE * NVME_QUEUE_SIZE);
+	write64(nvme->config + 0x30, virt_to_phys(cq_buffer));
+
+	nvme->queue[adc].base = cq_buffer;
+	nvme->queue[adc].bell = nvme->config + 0x1000 + (adc * (4 << cap_dstrd));
+	nvme->queue[adc].idx = 0;
+	nvme->queue[adc].round = 0;
+
+	return 0;
+}
+
+static void nvme_init(pcidev_t dev)
+{
+	printf("NVMe init (Device %02x:%02x.%02x)\n",
+			PCI_BUS(dev), PCI_SLOT(dev), PCI_FUNC(dev));
+
+	void *pci_bar0 = phys_to_virt(pci_read_config32(dev, 0x10) & ~0x3ff);
+
+	if (!(((read64(pci_bar0) >> 37) & 0xff) == 0x01)) {
+		printf("NVMe ERROR: PCIe device does not support the NVMe command set\n");
+		return;
+	}
+	struct nvme_dev *nvme = malloc(sizeof(*nvme));
+	if (!nvme) {
+		printf("NVMe ERROR: Failed to allocate buffer for nvme driver struct\n");
+		return;
+	}
+	nvme->storage_dev.port_type		= PORT_TYPE_NVME;
+	nvme->storage_dev.poll			= nvme_poll;
+	nvme->storage_dev.read_blocks512	= nvme_read_blocks512;
+	nvme->storage_dev.write_blocks512	= NULL;
+	nvme->storage_dev.detach_device		= nvme_detach_device;
+	nvme->pci_dev				= dev;
+	nvme->config				= pci_bar0;
+	nvme->prp_list				= memalign(0x1000, 0x1000);
+
+	if (!nvme->prp_list) {
+		printf("NVMe ERROR: Failed to allocate buffer for PRP list\n");
+		goto abort;
+	}
+
+	const uint32_t cc = NVME_CC_EN | NVME_CC_CSS | NVME_CC_MPS | NVME_CC_AMS | NVME_CC_SHN
+			| NVME_CC_IOSQES | NVME_CC_IOCQES;
+
+	write32(nvme->config + 0x1c, 0);
+
+	int status, timeout = (read64(nvme->config) >> 24 & 0xff) * 500;
+	do {
+		status = read32(nvme->config + 0x1c) & 0x3;
+		if (status == 0x2) {
+			printf("NVMe ERROR: Failed to disable controller. FATAL ERROR\n");
+			goto abort;
+		}
+		if (timeout < 0) {
+			printf("NVMe ERROR: Failed to disable controller. Timeout.\n");
+			goto abort;
+		}
+		timeout -= 10;
+		mdelay(10);
+	} while (status != 0x0);
+	if (create_admin_queues(nvme))
+		goto abort;
+	write32(nvme->config + 0x14, cc);
+
+	timeout = (read64(nvme->config) >> 24 & 0xff) * 500;
+	do {
+		status = read32(nvme->config + 0x1c) & 0x3;
+		if (status == 0x2)
+			goto abort;
+		if (timeout < 0)
+			goto abort;
+		timeout -= 10;
+		mdelay(10);
+	} while (status != 0x1);
+
+	uint16_t command = pci_read_config16(dev, PCI_COMMAND);
+	pci_write_config16(dev, PCI_COMMAND, command | PCI_COMMAND_MASTER);
+	if (create_io_completion_queue(nvme))
+		goto abort;
+	if (create_io_submission_queue(nvme))
+		goto abort;
+	storage_attach_device((storage_dev_t *)nvme);
+	printf("NVMe init done.\n");
+	return;
+
+abort:
+	printf("NVMe init failed.\n");
+	delete_io_submission_queue(nvme);
+	delete_io_completion_queue(nvme);
+	delete_admin_queues(nvme);
+	free(nvme->prp_list);
+	free(nvme);
+}
+
+void nvme_initialize(struct pci_dev *dev)
+{
+	nvme_init(PCI_DEV(dev->bus, dev->dev, dev->func));
+}