From 477632dff5c7deaa165701f441e9a4bd33e22b18 Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Wed, 29 Jan 2014 14:02:00 -0800 Subject: Revert "xhci: replace xhci_write_64() with writeq()" MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This reverts commit 7dd09a1af2c7150269350aaa567a11b06e831003. Many xHCI host controllers can only handle 32-bit addresses, and writing 64-bits at a time causes them to fail. Rafał reports that USB devices simply do not enumerate, and reverting this patch helps. Branimir reports that his host controller doesn't respond to an Enable Slot command and dies: [ 75.576160] xhci_hcd 0000:03:00.0: Timeout while waiting for a slot [ 88.991634] xhci_hcd 0000:03:00.0: Stopped the command ring failed, maybe the host is dead [ 88.991748] xhci_hcd 0000:03:00.0: Abort command ring failed [ 88.991845] xhci_hcd 0000:03:00.0: HC died; cleaning up [ 93.985489] xhci_hcd 0000:03:00.0: Timeout while waiting for a slot [ 93.985494] xhci_hcd 0000:03:00.0: Abort the command ring, but the xHCI is dead. [ 98.982586] xhci_hcd 0000:03:00.0: Timeout while waiting for a slot [ 98.982591] xhci_hcd 0000:03:00.0: Abort the command ring, but the xHCI is dead. [ 103.979696] xhci_hcd 0000:03:00.0: Timeout while waiting for a slot [ 103.979702] xhci_hcd 0000:03:00.0: Abort the command ring, but the xHCI is dead Signed-off-by: Sarah Sharp Reported-by: Rafał Miłecki Reported-by: Branimir Maksimovic Cc: Xenia Ragiadakou --- drivers/usb/host/xhci.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/usb/host/xhci.c') diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index ad364394885..ebbe52cafaa 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -769,11 +769,11 @@ static void xhci_restore_registers(struct xhci_hcd *xhci) { writel(xhci->s3.command, &xhci->op_regs->command); writel(xhci->s3.dev_nt, &xhci->op_regs->dev_notification); - writeq(xhci->s3.dcbaa_ptr, &xhci->op_regs->dcbaa_ptr); + xhci_write_64(xhci, xhci->s3.dcbaa_ptr, &xhci->op_regs->dcbaa_ptr); writel(xhci->s3.config_reg, &xhci->op_regs->config_reg); writel(xhci->s3.erst_size, &xhci->ir_set->erst_size); - writeq(xhci->s3.erst_base, &xhci->ir_set->erst_base); - writeq(xhci->s3.erst_dequeue, &xhci->ir_set->erst_dequeue); + xhci_write_64(xhci, xhci->s3.erst_base, &xhci->ir_set->erst_base); + xhci_write_64(xhci, xhci->s3.erst_dequeue, &xhci->ir_set->erst_dequeue); writel(xhci->s3.irq_pending, &xhci->ir_set->irq_pending); writel(xhci->s3.irq_control, &xhci->ir_set->irq_control); } @@ -792,7 +792,7 @@ static void xhci_set_cmd_ring_deq(struct xhci_hcd *xhci) xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Setting command ring address to 0x%llx", (long unsigned long) val_64); - writeq(val_64, &xhci->op_regs->cmd_ring); + xhci_write_64(xhci, val_64, &xhci->op_regs->cmd_ring); } /* -- cgit v1.2.3-70-g09d2 From f7b2e4032d52deff480e0c303fbd9180276f8dfc Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Thu, 30 Jan 2014 13:27:49 -0800 Subject: Revert "xhci: replace xhci_read_64() with readq()" This reverts commit e8b373326d8efcaf9ec1da8b618556c89bd5ffc4. Many xHCI host controllers can only handle 32-bit addresses, and writing 64-bits at a time causes them to fail. Reading 64-bits at a time may also cause them to return 0xffffffff, so revert this commit as well. Signed-off-by: Sarah Sharp --- drivers/usb/host/xhci-dbg.c | 6 +++--- drivers/usb/host/xhci-mem.c | 6 +++--- drivers/usb/host/xhci-ring.c | 6 +++--- drivers/usb/host/xhci.c | 12 ++++++------ drivers/usb/host/xhci.h | 10 ++++++++-- 5 files changed, 23 insertions(+), 17 deletions(-) (limited to 'drivers/usb/host/xhci.c') diff --git a/drivers/usb/host/xhci-dbg.c b/drivers/usb/host/xhci-dbg.c index b016d38199f..eb009a457fb 100644 --- a/drivers/usb/host/xhci-dbg.c +++ b/drivers/usb/host/xhci-dbg.c @@ -203,12 +203,12 @@ void xhci_print_ir_set(struct xhci_hcd *xhci, int set_num) addr, (unsigned int)temp); addr = &ir_set->erst_base; - temp_64 = readq(addr); + temp_64 = xhci_read_64(xhci, addr); xhci_dbg(xhci, " %p: ir_set.erst_base = @%08llx\n", addr, temp_64); addr = &ir_set->erst_dequeue; - temp_64 = readq(addr); + temp_64 = xhci_read_64(xhci, addr); xhci_dbg(xhci, " %p: ir_set.erst_dequeue = @%08llx\n", addr, temp_64); } @@ -412,7 +412,7 @@ void xhci_dbg_cmd_ptrs(struct xhci_hcd *xhci) { u64 val; - val = readq(&xhci->op_regs->cmd_ring); + val = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); xhci_dbg(xhci, "// xHC command ring deq ptr low bits + flags = @%08x\n", lower_32_bits(val)); xhci_dbg(xhci, "// xHC command ring deq ptr high bits = @%08x\n", diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 4b87026f8a5..bce4391a0e7 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1958,7 +1958,7 @@ static void xhci_set_hc_event_deq(struct xhci_hcd *xhci) xhci_warn(xhci, "WARN something wrong with SW event ring " "dequeue ptr.\n"); /* Update HC event ring dequeue pointer */ - temp = readq(&xhci->ir_set->erst_dequeue); + temp = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); temp &= ERST_PTR_MASK; /* Don't clear the EHB bit (which is RW1C) because * there might be more events to service. @@ -2312,7 +2312,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) (unsigned long long)xhci->cmd_ring->first_seg->dma); /* Set the address in the Command Ring Control register */ - val_64 = readq(&xhci->op_regs->cmd_ring); + val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) | (xhci->cmd_ring->first_seg->dma & (u64) ~CMD_RING_RSVD_BITS) | xhci->cmd_ring->cycle_state; @@ -2396,7 +2396,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Set ERST base address for ir_set 0 = 0x%llx", (unsigned long long)xhci->erst.erst_dma_addr); - val_64 = readq(&xhci->ir_set->erst_base); + val_64 = xhci_read_64(xhci, &xhci->ir_set->erst_base); val_64 &= ERST_PTR_MASK; val_64 |= (xhci->erst.erst_dma_addr & (u64) ~ERST_PTR_MASK); xhci_write_64(xhci, val_64, &xhci->ir_set->erst_base); diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index e19fae964f7..909b32a4412 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -307,7 +307,7 @@ static int xhci_abort_cmd_ring(struct xhci_hcd *xhci) return 0; } - temp_64 = readq(&xhci->op_regs->cmd_ring); + temp_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); if (!(temp_64 & CMD_RING_RUNNING)) { xhci_dbg(xhci, "Command ring had been stopped\n"); return 0; @@ -2865,7 +2865,7 @@ hw_died: /* Clear the event handler busy flag (RW1C); * the event ring should be empty. */ - temp_64 = readq(&xhci->ir_set->erst_dequeue); + temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); xhci_write_64(xhci, temp_64 | ERST_EHB, &xhci->ir_set->erst_dequeue); spin_unlock(&xhci->lock); @@ -2879,7 +2879,7 @@ hw_died: */ while (xhci_handle_event(xhci) > 0) {} - temp_64 = readq(&xhci->ir_set->erst_dequeue); + temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); /* If necessary, update the HW's version of the event ring deq ptr. */ if (event_ring_deq != xhci->event_ring->dequeue) { deq = xhci_trb_virt_to_dma(xhci->event_ring->deq_seg, diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index ebbe52cafaa..3712359d18b 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -611,7 +611,7 @@ int xhci_run(struct usb_hcd *hcd) xhci_dbg(xhci, "Event ring:\n"); xhci_debug_ring(xhci, xhci->event_ring); xhci_dbg_ring_ptrs(xhci, xhci->event_ring); - temp_64 = readq(&xhci->ir_set->erst_dequeue); + temp_64 = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); temp_64 &= ~ERST_PTR_MASK; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "ERST deq = 64'h%0lx", (long unsigned int) temp_64); @@ -756,11 +756,11 @@ static void xhci_save_registers(struct xhci_hcd *xhci) { xhci->s3.command = readl(&xhci->op_regs->command); xhci->s3.dev_nt = readl(&xhci->op_regs->dev_notification); - xhci->s3.dcbaa_ptr = readq(&xhci->op_regs->dcbaa_ptr); + xhci->s3.dcbaa_ptr = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr); xhci->s3.config_reg = readl(&xhci->op_regs->config_reg); xhci->s3.erst_size = readl(&xhci->ir_set->erst_size); - xhci->s3.erst_base = readq(&xhci->ir_set->erst_base); - xhci->s3.erst_dequeue = readq(&xhci->ir_set->erst_dequeue); + xhci->s3.erst_base = xhci_read_64(xhci, &xhci->ir_set->erst_base); + xhci->s3.erst_dequeue = xhci_read_64(xhci, &xhci->ir_set->erst_dequeue); xhci->s3.irq_pending = readl(&xhci->ir_set->irq_pending); xhci->s3.irq_control = readl(&xhci->ir_set->irq_control); } @@ -783,7 +783,7 @@ static void xhci_set_cmd_ring_deq(struct xhci_hcd *xhci) u64 val_64; /* step 2: initialize command ring buffer */ - val_64 = readq(&xhci->op_regs->cmd_ring); + val_64 = xhci_read_64(xhci, &xhci->op_regs->cmd_ring); val_64 = (val_64 & (u64) CMD_RING_RSVD_BITS) | (xhci_trb_virt_to_dma(xhci->cmd_ring->deq_seg, xhci->cmd_ring->dequeue) & @@ -3842,7 +3842,7 @@ static int xhci_setup_device(struct usb_hcd *hcd, struct usb_device *udev, if (ret) { return ret; } - temp_64 = readq(&xhci->op_regs->dcbaa_ptr); + temp_64 = xhci_read_64(xhci, &xhci->op_regs->dcbaa_ptr); xhci_dbg_trace(xhci, trace_xhci_dbg_address, "Op regs DCBAA ptr = %#016llx", temp_64); xhci_dbg_trace(xhci, trace_xhci_dbg_address, diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 60def15d129..9154fd6cf24 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -28,8 +28,6 @@ #include #include -#include - /* Code sharing between pci-quirks and xhci hcd */ #include "xhci-ext-caps.h" #include "pci-quirks.h" @@ -1614,6 +1612,14 @@ static inline struct usb_hcd *xhci_to_hcd(struct xhci_hcd *xhci) * xHCI implementations that do not support 64-bit address pointers will ignore * the high dword, and write order is irrelevant. */ +static inline u64 xhci_read_64(const struct xhci_hcd *xhci, + __le64 __iomem *regs) +{ + __u32 __iomem *ptr = (__u32 __iomem *) regs; + u64 val_lo = readl(ptr); + u64 val_hi = readl(ptr + 1); + return val_lo + (val_hi << 32); +} static inline void xhci_write_64(struct xhci_hcd *xhci, const u64 val, __le64 __iomem *regs) { -- cgit v1.2.3-70-g09d2 From 247bf557273dd775505fb9240d2d152f4f20d304 Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Fri, 31 Jan 2014 11:26:25 -0800 Subject: xhci 1.0: Limit arbitrarily-aligned scatter gather. MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit xHCI 1.0 hosts have a set of requirements on how to align transfer buffers on the endpoint rings called "TD fragment" rules. When the ax88179_178a driver added support for scatter gather in 3.12, with commit 804fad45411b48233b48003e33a78f290d227c8 "USBNET: ax88179_178a: enable tso if usb host supports sg dma", it broke the device under xHCI 1.0 hosts. Under certain network loads, the device would see an unexpected short packet from the host, which would cause the device to stop sending ethernet packets, even through USB packets would still be sent. Commit 35773dac5f86 "usb: xhci: Link TRB must not occur within a USB payload burst" attempted to fix this. It was a quick hack to partially implement the TD fragment rules. However, it caused regressions in the usb-storage layer and userspace USB drivers using libusb. The patches to attempt to fix this are too far reaching into the USB core, and we really need to implement the TD fragment rules correctly in the xHCI driver, instead of continuing to wallpaper over the issues. Disable arbitrarily-aligned scatter-gather in the xHCI driver for 1.0 hosts. Only the ax88179_178a driver checks the no_sg_constraint flag, so don't set it for 1.0 hosts. This should not impact usb-storage or usbfs behavior, since they pass down max packet sized aligned sg-list entries (512 for USB 2.0 and 1024 for USB 3.0). Signed-off-by: Sarah Sharp Tested-by: Mark Lord Cc: David Laight Cc: Bjørn Mork Cc: Freddy Xin Cc: Ming Lei Cc: stable@vger.kernel.org # 3.12 --- drivers/usb/host/xhci.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) (limited to 'drivers/usb/host/xhci.c') diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 3712359d18b..86a2e834fdf 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4733,9 +4733,6 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) /* Limit the block layer scatter-gather lists to half a segment. */ hcd->self.sg_tablesize = TRBS_PER_SEGMENT / 2; - /* support to build packet from discontinuous buffers */ - hcd->self.no_sg_constraint = 1; - /* XHCI controllers don't stop the ep queue on short packets :| */ hcd->self.no_stop_on_short = 1; @@ -4760,6 +4757,14 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) /* xHCI private pointer was set in xhci_pci_probe for the second * registered roothub. */ + xhci = hcd_to_xhci(hcd); + /* + * Support arbitrarily aligned sg-list entries on hosts without + * TD fragment rules (which are currently unsupported). + */ + if (xhci->hci_version < 0x100) + hcd->self.no_sg_constraint = 1; + return 0; } @@ -4788,6 +4793,9 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) if (xhci->hci_version > 0x96) xhci->quirks |= XHCI_SPURIOUS_SUCCESS; + if (xhci->hci_version < 0x100) + hcd->self.no_sg_constraint = 1; + /* Make sure the HC is halted. */ retval = xhci_halt(xhci); if (retval) -- cgit v1.2.3-70-g09d2 From 1386ff75797a187df324062fb4e929152392da88 Mon Sep 17 00:00:00 2001 From: Sarah Sharp Date: Fri, 31 Jan 2014 11:45:02 -0800 Subject: Revert "xhci: Set scatter-gather limit to avoid failed block writes." This reverts commit f2d9b991c549f159dc9ae81f77d8206c790cbfee. We are ripping out commit 35773dac5f862cb1c82ea151eba3e2f6de51ec3e "usb: xhci: Link TRB must not occur within a USB payload burst" because it's a hack that caused regressions in the usb-storage and userspace USB drivers that use usbfs and libusb. This commit attempted to fix the issues with that patch. Signed-off-by: Sarah Sharp Cc: stable@vger.kernel.org #3.12 --- drivers/usb/host/xhci.c | 4 ++-- drivers/usb/host/xhci.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) (limited to 'drivers/usb/host/xhci.c') diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index 86a2e834fdf..6fe577d46fa 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -4730,8 +4730,8 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks) struct device *dev = hcd->self.controller; int retval; - /* Limit the block layer scatter-gather lists to half a segment. */ - hcd->self.sg_tablesize = TRBS_PER_SEGMENT / 2; + /* Accept arbitrarily long scatter-gather lists */ + hcd->self.sg_tablesize = ~0; /* XHCI controllers don't stop the ep queue on short packets :| */ hcd->self.no_stop_on_short = 1; diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 9154fd6cf24..58ed9d088e6 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1268,7 +1268,7 @@ union xhci_trb { * since the command ring is 64-byte aligned. * It must also be greater than 16. */ -#define TRBS_PER_SEGMENT 256 +#define TRBS_PER_SEGMENT 64 /* Allow two commands + a link TRB, along with any reserved command TRBs */ #define MAX_RSVD_CMD_TRBS (TRBS_PER_SEGMENT - 3) #define TRB_SEGMENT_SIZE (TRBS_PER_SEGMENT*16) -- cgit v1.2.3-70-g09d2