[PATCH] USB: UHCI: Split apart the physical and logical framelist arrays

This patch (as563) splits the physical and logical framelist arrays in
uhci-hcd into two separate pieces.  This will allow slightly better memory
utilization, since each piece is no larger than a single page whereas
before the whole thing was a little bigger than two pages.  It also allows
the logical array to be allocated in non-DMA-coherent memory.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

4 files changed, 44 insertions, 28 deletions

diff --git a/drivers/usb/host/uhci-debug.c b/drivers/usb/host/uhci-debug.c
index 04eddd7995c3..151154df37fa 100644
--- a/drivers/usb/host/uhci-debug.c
+++ b/drivers/usb/host/uhci-debug.c
@@ -445,11 +445,11 @@ static int uhci_sprint_schedule(struct uhci_hcd *uhci, char *buf, int len)
         out += sprintf(out, "Frame List\n");
         for (i = 0; i < UHCI_NUMFRAMES; ++i) {
                 int shown = 0;
-                td = uhci->fl->frame_cpu[i];
+                td = uhci->frame_cpu[i];
                 if (!td)
                         continue;
 
-                if (td->dma_handle != (dma_addr_t)uhci->fl->frame[i]) {
+                if (td->dma_handle != (dma_addr_t)uhci->frame[i]) {
                         show_frame_num();
                         out += sprintf(out, "    frame list does not match td->dma_handle!\n");
                 }
diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c
index 17de9ee910f6..b44094fcd779 100644
--- a/drivers/usb/host/uhci-hcd.c
+++ b/drivers/usb/host/uhci-hcd.c
@@ -212,7 +212,7 @@ static void configure_hc(struct uhci_hcd *uhci)
         outb(USBSOF_DEFAULT, uhci->io_addr + USBSOF);
 
         /* Store the frame list base address */
-        outl(uhci->fl->dma_handle, uhci->io_addr + USBFLBASEADD);
+        outl(uhci->frame_dma_handle, uhci->io_addr + USBFLBASEADD);
 
         /* Set the current frame number */
         outw(uhci->frame_number, uhci->io_addr + USBFRNUM);
@@ -445,8 +445,11 @@ static void release_uhci(struct uhci_hcd *uhci)
 
         dma_pool_destroy(uhci->td_pool);
 
-        dma_free_coherent(uhci_dev(uhci), sizeof(*uhci->fl),
-                        uhci->fl, uhci->fl->dma_handle);
+        kfree(uhci->frame_cpu);
+
+        dma_free_coherent(uhci_dev(uhci),
+                        UHCI_NUMFRAMES * sizeof(*uhci->frame),
+                        uhci->frame, uhci->frame_dma_handle);
 
         debugfs_remove(uhci->dentry);
 }
@@ -527,7 +530,6 @@ static int uhci_start(struct usb_hcd *hcd)
         struct uhci_hcd *uhci = hcd_to_uhci(hcd);
         int retval = -EBUSY;
         int i;
-        dma_addr_t dma_handle;
         struct dentry *dentry;
 
         hcd->uses_new_polling = 1;
@@ -561,17 +563,23 @@ static int uhci_start(struct usb_hcd *hcd)
 
         init_waitqueue_head(&uhci->waitqh);
 
-        uhci->fl = dma_alloc_coherent(uhci_dev(uhci), sizeof(*uhci->fl),
-                        &dma_handle, 0);
-        if (!uhci->fl) {
+        uhci->frame = dma_alloc_coherent(uhci_dev(uhci),
+                        UHCI_NUMFRAMES * sizeof(*uhci->frame),
+                        &uhci->frame_dma_handle, 0);
+        if (!uhci->frame) {
                 dev_err(uhci_dev(uhci), "unable to allocate "
                                 "consistent memory for frame list\n");
-                goto err_alloc_fl;
+                goto err_alloc_frame;
         }
+        memset(uhci->frame, 0, UHCI_NUMFRAMES * sizeof(*uhci->frame));
 
-        memset((void *)uhci->fl, 0, sizeof(*uhci->fl));
-
-        uhci->fl->dma_handle = dma_handle;
+        uhci->frame_cpu = kcalloc(UHCI_NUMFRAMES, sizeof(*uhci->frame_cpu),
+                        GFP_KERNEL);
+        if (!uhci->frame_cpu) {
+                dev_err(uhci_dev(uhci), "unable to allocate "
+                                "memory for frame pointers\n");
+                goto err_alloc_frame_cpu;
+        }
 
         uhci->td_pool = dma_pool_create("uhci_td", uhci_dev(uhci),
                         sizeof(struct uhci_td), 16, 0);
@@ -654,7 +662,7 @@ static int uhci_start(struct usb_hcd *hcd)
                         irq = 7;
 
                 /* Only place we don't use the frame list routines */
-                uhci->fl->frame[i] = UHCI_PTR_QH |
+                uhci->frame[i] = UHCI_PTR_QH |
                                 cpu_to_le32(uhci->skelqh[irq]->dma_handle);
         }
 
@@ -686,10 +694,14 @@ err_create_qh_pool:
         dma_pool_destroy(uhci->td_pool);
 
 err_create_td_pool:
-        dma_free_coherent(uhci_dev(uhci), sizeof(*uhci->fl),
-                        uhci->fl, uhci->fl->dma_handle);
+        kfree(uhci->frame_cpu);
+
+err_alloc_frame_cpu:
+        dma_free_coherent(uhci_dev(uhci),
+                        UHCI_NUMFRAMES * sizeof(*uhci->frame),
+                        uhci->frame, uhci->frame_dma_handle);
 
-err_alloc_fl:
+err_alloc_frame:
         debugfs_remove(uhci->dentry);
 
 err_create_debug_entry:
diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h
index 1c161b4f5bcf..b04d99df0a0e 100644
--- a/drivers/usb/host/uhci-hcd.h
+++ b/drivers/usb/host/uhci-hcd.h
@@ -359,7 +359,11 @@ struct uhci_hcd {
         struct uhci_qh *skelqh[UHCI_NUM_SKELQH];        /* Skeleton QH's */
 
         spinlock_t lock;
-        struct uhci_frame_list *fl;             /* P: uhci->lock */
+
+        dma_addr_t frame_dma_handle;            /* Hardware frame list */
+        __le32 *frame;                          /* P: uhci->lock */
+        void **frame_cpu;                       /* CPU's frame list */
+
         int fsbr;                               /* Full-speed bandwidth reclamation */
         unsigned long fsbrtimeout;              /* FSBR delay */
 
diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c
index d54038211ca6..51de06bc438d 100644
--- a/drivers/usb/host/uhci-q.c
+++ b/drivers/usb/host/uhci-q.c
@@ -89,10 +89,10 @@ static void uhci_insert_td_frame_list(struct uhci_hcd *uhci, struct uhci_td *td,
         td->frame = framenum;
 
         /* Is there a TD already mapped there? */
-        if (uhci->fl->frame_cpu[framenum]) {
+        if (uhci->frame_cpu[framenum]) {
                 struct uhci_td *ftd, *ltd;
 
-                ftd = uhci->fl->frame_cpu[framenum];
+                ftd = uhci->frame_cpu[framenum];
                 ltd = list_entry(ftd->fl_list.prev, struct uhci_td, fl_list);
 
                 list_add_tail(&td->fl_list, &ftd->fl_list);
@@ -101,10 +101,10 @@ static void uhci_insert_td_frame_list(struct uhci_hcd *uhci, struct uhci_td *td,
                 wmb();
                 ltd->link = cpu_to_le32(td->dma_handle);
         } else {
-                td->link = uhci->fl->frame[framenum];
+                td->link = uhci->frame[framenum];
                 wmb();
-                uhci->fl->frame[framenum] = cpu_to_le32(td->dma_handle);
-                uhci->fl->frame_cpu[framenum] = td;
+                uhci->frame[framenum] = cpu_to_le32(td->dma_handle);
+                uhci->frame_cpu[framenum] = td;
         }
 }
 
@@ -114,16 +114,16 @@ static void uhci_remove_td(struct uhci_hcd *uhci, struct uhci_td *td)
         if (td->frame == -1 && list_empty(&td->fl_list))
                 return;
 
-        if (td->frame != -1 && uhci->fl->frame_cpu[td->frame] == td) {
+        if (td->frame != -1 && uhci->frame_cpu[td->frame] == td) {
                 if (list_empty(&td->fl_list)) {
-                        uhci->fl->frame[td->frame] = td->link;
-                        uhci->fl->frame_cpu[td->frame] = NULL;
+                        uhci->frame[td->frame] = td->link;
+                        uhci->frame_cpu[td->frame] = NULL;
                 } else {
                         struct uhci_td *ntd;
 
                         ntd = list_entry(td->fl_list.next, struct uhci_td, fl_list);
-                        uhci->fl->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
-                        uhci->fl->frame_cpu[td->frame] = ntd;
+                        uhci->frame[td->frame] = cpu_to_le32(ntd->dma_handle);
+                        uhci->frame_cpu[td->frame] = ntd;
                 }
         } else {
                 struct uhci_td *ptd;