@@ -14,6 +14,7 @@
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
+#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/hdreg.h>
#include <linux/kernel.h>
@@ -670,6 +671,111 @@ const struct block_device_operations nvme_fops = {
.pr_ops = &nvme_pr_ops,
};
+static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled)
+{
+ unsigned long timeout =
+ ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
+ u32 csts, bit = enabled ? NVME_CSTS_RDY : 0;
+ int ret;
+
+ while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
+ if ((csts & NVME_CSTS_RDY) == bit)
+ break;
+
+ msleep(100);
+ if (fatal_signal_pending(current))
+ return -EINTR;
+ if (time_after(jiffies, timeout)) {
+ dev_err(ctrl->dev,
+ "Device not ready; aborting %s\n", enabled ?
+ "initialisation" : "reset");
+ return -ENODEV;
+ }
+ }
+
+ return ret;
+}
+
+/*
+ * If the device has been passed off to us in an enabled state, just clear
+ * the enabled bit. The spec says we should set the 'shutdown notification
+ * bits', but doing so may cause the device to complete commands to the
+ * admin queue ... and we don't know what memory that might be pointing at!
+ */
+int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
+{
+ int ret;
+
+ ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
+ ctrl->ctrl_config &= ~NVME_CC_ENABLE;
+
+ ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
+ if (ret)
+ return ret;
+ return nvme_wait_ready(ctrl, cap, false);
+}
+
+int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap)
+{
+ /*
+ * Default to a 4K page size, with the intention to update this
+ * path in the future to accomodate architectures with differing
+ * kernel and IO page sizes.
+ */
+ unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
+ int ret;
+
+ if (page_shift < dev_page_min) {
+ dev_err(ctrl->dev,
+ "Minimum device page size %u too large for host (%u)\n",
+ 1 << dev_page_min, 1 << page_shift);
+ return -ENODEV;
+ }
+
+ ctrl->page_size = 1 << page_shift;
+
+ ctrl->ctrl_config = NVME_CC_CSS_NVM;
+ ctrl->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
+ ctrl->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
+ ctrl->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
+ ctrl->ctrl_config |= NVME_CC_ENABLE;
+
+ ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
+ if (ret)
+ return ret;
+ return nvme_wait_ready(ctrl, cap, true);
+}
+
+int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl)
+{
+ unsigned long timeout = SHUTDOWN_TIMEOUT + jiffies;
+ u32 csts;
+ int ret;
+
+ ctrl->ctrl_config &= ~NVME_CC_SHN_MASK;
+ ctrl->ctrl_config |= NVME_CC_SHN_NORMAL;
+
+ ret = ctrl->ops->reg_write32(ctrl, NVME_REG_CC, ctrl->ctrl_config);
+ if (ret)
+ return ret;
+
+ while ((ret = ctrl->ops->reg_read32(ctrl, NVME_REG_CSTS, &csts)) == 0) {
+ if ((csts & NVME_CSTS_SHST_MASK) == NVME_CSTS_SHST_CMPLT)
+ break;
+
+ msleep(100);
+ if (fatal_signal_pending(current))
+ return -EINTR;
+ if (time_after(jiffies, timeout)) {
+ dev_err(ctrl->dev,
+ "Device shutdown incomplete; abort shutdown\n");
+ return -ENODEV;
+ }
+ }
+
+ return ret;
+}
+
static void nvme_free_ctrl(struct kref *kref)
{
struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref);
@@ -27,6 +27,9 @@ extern unsigned char nvme_io_timeout;
extern unsigned char admin_timeout;
#define ADMIN_TIMEOUT (admin_timeout * HZ)
+extern unsigned char shutdown_timeout;
+#define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ)
+
enum {
NVME_NS_LBA = 0,
NVME_NS_LIGHTNVM = 1,
@@ -55,6 +58,10 @@ struct nvme_ctrl {
char serial[20];
char model[40];
char firmware_rev[8];
+
+ u32 ctrl_config;
+
+ u32 page_size;
u16 oncs;
u16 abort_limit;
u8 event_limit;
@@ -85,6 +92,7 @@ struct nvme_ns {
struct nvme_ctrl_ops {
int (*reg_read32)(struct nvme_ctrl *ctrl, u32 off, u32 *val);
+ int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val);
void (*free_ctrl)(struct nvme_ctrl *ctrl);
};
@@ -165,6 +173,9 @@ static inline int nvme_error_status(u16 status)
}
}
+int nvme_disable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
+int nvme_enable_ctrl(struct nvme_ctrl *ctrl, u64 cap);
+int nvme_shutdown_ctrl(struct nvme_ctrl *ctrl);
void nvme_put_ctrl(struct nvme_ctrl *ctrl);
void nvme_put_ns(struct nvme_ns *ns);
@@ -52,7 +52,6 @@
#define NVME_AQ_DEPTH 256
#define SQ_SIZE(depth) (depth * sizeof(struct nvme_command))
#define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion))
-#define SHUTDOWN_TIMEOUT (shutdown_timeout * HZ)
unsigned char admin_timeout = 60;
module_param(admin_timeout, byte, 0644);
@@ -62,7 +61,7 @@ unsigned char nvme_io_timeout = 30;
module_param_named(io_timeout, nvme_io_timeout, byte, 0644);
MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O");
-static unsigned char shutdown_timeout = 5;
+unsigned char shutdown_timeout = 5;
module_param(shutdown_timeout, byte, 0644);
MODULE_PARM_DESC(shutdown_timeout, "timeout in seconds for controller shutdown");
@@ -122,7 +121,6 @@ struct nvme_dev {
unsigned max_qid;
int q_depth;
u32 db_stride;
- u32 ctrl_config;
struct msix_entry *entry;
void __iomem *bar;
struct list_head namespaces;
@@ -133,7 +131,6 @@ struct nvme_dev {
bool subsystem;
u32 max_hw_sectors;
u32 stripe_size;
- u32 page_size;
void __iomem *cmb;
dma_addr_t cmb_dma_addr;
u64 cmb_size;
@@ -225,7 +222,7 @@ struct nvme_cmd_info {
* Max size of iod being embedded in the request payload
*/
#define NVME_INT_PAGES 2
-#define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->page_size)
+#define NVME_INT_BYTES(dev) (NVME_INT_PAGES * (dev)->ctrl.page_size)
#define NVME_INT_MASK 0x01
/*
@@ -235,7 +232,8 @@ struct nvme_cmd_info {
*/
static int nvme_npages(unsigned size, struct nvme_dev *dev)
{
- unsigned nprps = DIV_ROUND_UP(size + dev->page_size, dev->page_size);
+ unsigned nprps = DIV_ROUND_UP(size + dev->ctrl.page_size,
+ dev->ctrl.page_size);
return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8);
}
@@ -527,7 +525,7 @@ static struct nvme_iod *nvme_alloc_iod(struct request *rq, struct nvme_dev *dev,
static void nvme_free_iod(struct nvme_dev *dev, struct nvme_iod *iod)
{
- const int last_prp = dev->page_size / 8 - 1;
+ const int last_prp = dev->ctrl.page_size / 8 - 1;
int i;
__le64 **list = iod_list(iod);
dma_addr_t prp_dma = iod->first_dma;
@@ -668,7 +666,7 @@ static bool nvme_setup_prps(struct nvme_dev *dev, struct nvme_iod *iod,
struct scatterlist *sg = iod->sg;
int dma_len = sg_dma_len(sg);
u64 dma_addr = sg_dma_address(sg);
- u32 page_size = dev->page_size;
+ u32 page_size = dev->ctrl.page_size;
int offset = dma_addr & (page_size - 1);
__le64 *prp_list;
__le64 **list = iod_list(iod);
@@ -1275,11 +1273,12 @@ static int nvme_cmb_qdepth(struct nvme_dev *dev, int nr_io_queues,
int entry_size)
{
int q_depth = dev->q_depth;
- unsigned q_size_aligned = roundup(q_depth * entry_size, dev->page_size);
+ unsigned q_size_aligned = roundup(q_depth * entry_size,
+ dev->ctrl.page_size);
if (q_size_aligned * nr_io_queues > dev->cmb_size) {
u64 mem_per_q = div_u64(dev->cmb_size, nr_io_queues);
- mem_per_q = round_down(mem_per_q, dev->page_size);
+ mem_per_q = round_down(mem_per_q, dev->ctrl.page_size);
q_depth = div_u64(mem_per_q, entry_size);
/*
@@ -1298,8 +1297,8 @@ static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq,
int qid, int depth)
{
if (qid && dev->cmb && use_cmb_sqes && NVME_CMB_SQS(dev->cmbsz)) {
- unsigned offset = (qid - 1) *
- roundup(SQ_SIZE(depth), dev->page_size);
+ unsigned offset = (qid - 1) * roundup(SQ_SIZE(depth),
+ dev->ctrl.page_size);
nvmeq->sq_dma_addr = dev->cmb_dma_addr + offset;
nvmeq->sq_cmds_io = dev->cmb + offset;
} else {
@@ -1407,97 +1406,6 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid)
return result;
}
-static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled)
-{
- unsigned long timeout;
- u32 bit = enabled ? NVME_CSTS_RDY : 0;
-
- timeout = ((NVME_CAP_TIMEOUT(cap) + 1) * HZ / 2) + jiffies;
-
- while ((readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_RDY) != bit) {
- msleep(100);
- if (fatal_signal_pending(current))
- return -EINTR;
- if (time_after(jiffies, timeout)) {
- dev_err(dev->dev,
- "Device not ready; aborting %s\n", enabled ?
- "initialisation" : "reset");
- return -ENODEV;
- }
- }
-
- return 0;
-}
-
-/*
- * If the device has been passed off to us in an enabled state, just clear
- * the enabled bit. The spec says we should set the 'shutdown notification
- * bits', but doing so may cause the device to complete commands to the
- * admin queue ... and we don't know what memory that might be pointing at!
- */
-static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap)
-{
- dev->ctrl_config &= ~NVME_CC_SHN_MASK;
- dev->ctrl_config &= ~NVME_CC_ENABLE;
- writel(dev->ctrl_config, dev->bar + NVME_REG_CC);
-
- return nvme_wait_ready(dev, cap, false);
-}
-
-static int nvme_enable_ctrl(struct nvme_dev *dev, u64 cap)
-{
- /*
- * Default to a 4K page size, with the intention to update this
- * path in the future to accomodate architectures with differing
- * kernel and IO page sizes.
- */
- unsigned dev_page_min = NVME_CAP_MPSMIN(cap) + 12, page_shift = 12;
-
- if (page_shift < dev_page_min) {
- dev_err(dev->dev,
- "Minimum device page size %u too large for host (%u)\n",
- 1 << dev_page_min, 1 << page_shift);
- return -ENODEV;
- }
-
- dev->page_size = 1 << page_shift;
-
- dev->ctrl_config = NVME_CC_CSS_NVM;
- dev->ctrl_config |= (page_shift - 12) << NVME_CC_MPS_SHIFT;
- dev->ctrl_config |= NVME_CC_ARB_RR | NVME_CC_SHN_NONE;
- dev->ctrl_config |= NVME_CC_IOSQES | NVME_CC_IOCQES;
- dev->ctrl_config |= NVME_CC_ENABLE;
-
- writel(dev->ctrl_config, dev->bar + NVME_REG_CC);
-
- return nvme_wait_ready(dev, cap, true);
-}
-
-static int nvme_shutdown_ctrl(struct nvme_dev *dev)
-{
- unsigned long timeout;
-
- dev->ctrl_config &= ~NVME_CC_SHN_MASK;
- dev->ctrl_config |= NVME_CC_SHN_NORMAL;
-
- writel(dev->ctrl_config, dev->bar + NVME_REG_CC);
-
- timeout = SHUTDOWN_TIMEOUT + jiffies;
- while ((readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_SHST_MASK) !=
- NVME_CSTS_SHST_CMPLT) {
- msleep(100);
- if (fatal_signal_pending(current))
- return -EINTR;
- if (time_after(jiffies, timeout)) {
- dev_err(dev->dev,
- "Device shutdown incomplete; abort shutdown\n");
- return -ENODEV;
- }
- }
-
- return 0;
-}
-
static struct blk_mq_ops nvme_mq_admin_ops = {
.queue_rq = nvme_queue_rq,
.map_queue = blk_mq_map_queue,
@@ -1569,7 +1477,7 @@ static int nvme_configure_admin_queue(struct nvme_dev *dev)
(readl(dev->bar + NVME_REG_CSTS) & NVME_CSTS_NSSRO))
writel(NVME_CSTS_NSSRO, dev->bar + NVME_REG_CSTS);
- result = nvme_disable_ctrl(dev, cap);
+ result = nvme_disable_ctrl(&dev->ctrl, cap);
if (result < 0)
return result;
@@ -1587,7 +1495,7 @@ static int nvme_configure_admin_queue(struct nvme_dev *dev)
lo_hi_writeq(nvmeq->sq_dma_addr, dev->bar + NVME_REG_ASQ);
lo_hi_writeq(nvmeq->cq_dma_addr, dev->bar + NVME_REG_ACQ);
- result = nvme_enable_ctrl(dev, cap);
+ result = nvme_enable_ctrl(&dev->ctrl, cap);
if (result)
goto free_nvmeq;
@@ -1687,13 +1595,13 @@ static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid)
if (dev->max_hw_sectors) {
blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors);
blk_queue_max_segments(ns->queue,
- (dev->max_hw_sectors / (dev->page_size >> 9)) + 1);
+ (dev->max_hw_sectors / (dev->ctrl.page_size >> 9)) + 1);
}
if (dev->stripe_size)
blk_queue_chunk_sectors(ns->queue, dev->stripe_size >> 9);
if (dev->ctrl.vwc & NVME_CTRL_VWC_PRESENT)
blk_queue_flush(ns->queue, REQ_FLUSH | REQ_FUA);
- blk_queue_virt_boundary(ns->queue, dev->page_size - 1);
+ blk_queue_virt_boundary(ns->queue, dev->ctrl.page_size - 1);
disk->major = nvme_major;
disk->first_minor = 0;
@@ -2181,7 +2089,7 @@ static void nvme_wait_dq(struct nvme_delq_ctx *dq, struct nvme_dev *dev)
* queues than admin tags.
*/
set_current_state(TASK_RUNNING);
- nvme_disable_ctrl(dev,
+ nvme_disable_ctrl(&dev->ctrl,
lo_hi_readq(dev->bar + NVME_REG_CAP));
nvme_clear_queue(dev->queues[0]);
flush_kthread_worker(dq->worker);
@@ -2367,7 +2275,7 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
}
} else {
nvme_disable_io_queues(dev);
- nvme_shutdown_ctrl(dev);
+ nvme_shutdown_ctrl(&dev->ctrl);
nvme_disable_queue(dev, 0);
}
nvme_dev_unmap(dev);
@@ -2683,8 +2591,15 @@ static int nvme_pci_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val)
return 0;
}
+static int nvme_pci_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val)
+{
+ writel(val, to_nvme_dev(ctrl)->bar + off);
+ return 0;
+}
+
static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = {
.reg_read32 = nvme_pci_reg_read32,
+ .reg_write32 = nvme_pci_reg_write32,
.free_ctrl = nvme_pci_free_ctrl,
};
Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/nvme/host/core.c | 106 +++++++++++++++++++++++++++++++++++++ drivers/nvme/host/nvme.h | 11 ++++ drivers/nvme/host/pci.c | 133 +++++++++-------------------------------------- 3 files changed, 141 insertions(+), 109 deletions(-)