From: Niklas Neronin niklas.neronin@linux.intel.com
[ Upstream commit 68c1f1671650b49bbd26e6a65ddcf33f2565efa3 ]
The current xHCI driver does not validate whether a page size of 4096 bytes is supported. Address the issue by setting the page size to the value supported by the xHCI controller, as read from the Page Size register. In the event of an unexpected value; default to a 4K page size.
Additionally, this commit removes unnecessary debug messages and instead prints the supported and used page size once.
The xHCI controller supports page sizes of (2^{(n+12)}) bytes, where 'n' is the Page Size Bit. Only one page size is supported, with a maximum page size of 128 KB.
Signed-off-by: Niklas Neronin niklas.neronin@linux.intel.com Signed-off-by: Mathias Nyman mathias.nyman@linux.intel.com Link: https://lore.kernel.org/r/20250306144954.3507700-10-mathias.nyman@linux.inte... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/host/xhci-mem.c | 34 ++++++++++++++++++---------------- drivers/usb/host/xhci.h | 8 ++++---- 2 files changed, 22 insertions(+), 20 deletions(-)
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 9aa7e2a876ec1..d698095fc88d3 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1953,7 +1953,6 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci) xhci->interrupters = NULL;
xhci->page_size = 0; - xhci->page_shift = 0; xhci->usb2_rhub.bus_state.bus_suspended = 0; xhci->usb3_rhub.bus_state.bus_suspended = 0; } @@ -2372,6 +2371,22 @@ xhci_create_secondary_interrupter(struct usb_hcd *hcd, unsigned int segs, } EXPORT_SYMBOL_GPL(xhci_create_secondary_interrupter);
+static void xhci_hcd_page_size(struct xhci_hcd *xhci) +{ + u32 page_size; + + page_size = readl(&xhci->op_regs->page_size) & XHCI_PAGE_SIZE_MASK; + if (!is_power_of_2(page_size)) { + xhci_warn(xhci, "Invalid page size register = 0x%x\n", page_size); + /* Fallback to 4K page size, since that's common */ + page_size = 1; + } + + xhci->page_size = page_size << 12; + xhci_dbg_trace(xhci, trace_xhci_dbg_init, "HCD page size set to %iK", + xhci->page_size >> 10); +} + int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) { struct xhci_interrupter *ir; @@ -2379,7 +2394,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) dma_addr_t dma; unsigned int val, val2; u64 val_64; - u32 page_size, temp; + u32 temp; int i;
INIT_LIST_HEAD(&xhci->cmd_list); @@ -2388,20 +2403,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) INIT_DELAYED_WORK(&xhci->cmd_timer, xhci_handle_command_timeout); init_completion(&xhci->cmd_ring_stop_completion);
- page_size = readl(&xhci->op_regs->page_size); - xhci_dbg_trace(xhci, trace_xhci_dbg_init, - "Supported page size register = 0x%x", page_size); - val = ffs(page_size) - 1; - if (val < 16) - xhci_dbg_trace(xhci, trace_xhci_dbg_init, - "Supported page size of %iK", (1 << (val + 12)) / 1024); - else - xhci_warn(xhci, "WARN: no supported page size\n"); - /* Use 4K pages, since that's common and the minimum the HC supports */ - xhci->page_shift = 12; - xhci->page_size = 1 << xhci->page_shift; - xhci_dbg_trace(xhci, trace_xhci_dbg_init, - "HCD page size set to %iK", xhci->page_size / 1024); + xhci_hcd_page_size(xhci);
/* * Program the Number of Device Slots Enabled field in the CONFIG diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 2c394cba120f1..7d22617417fe0 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -211,6 +211,9 @@ struct xhci_op_regs { #define CONFIG_CIE (1 << 9) /* bits 10:31 - reserved and should be preserved */
+/* bits 15:0 - HCD page shift bit */ +#define XHCI_PAGE_SIZE_MASK 0xffff + /** * struct xhci_intr_reg - Interrupt Register Set * @irq_pending: IMAN - Interrupt Management Register. Used to enable @@ -1514,10 +1517,7 @@ struct xhci_hcd { u16 max_interrupters; /* imod_interval in ns (I * 250ns) */ u32 imod_interval; - /* 4KB min, 128MB max */ - int page_size; - /* Valid values are 12 to 20, inclusive */ - int page_shift; + u32 page_size; /* MSI-X/MSI vectors */ int nvecs; /* optional clocks */