Rev 846 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1049 | mauro | 1 | /* |
| 2 | * DMA memory management for framework level HCD code (hc_driver) |
||
| 3 | * |
||
| 4 | * This implementation plugs in through generic "usb_bus" level methods, |
||
| 5 | * and works with real PCI, or when "pci device == null" makes sense. |
||
| 6 | */ |
||
| 7 | |||
| 8 | #include <linuxcomp.h> |
||
| 9 | |||
| 10 | #include <linux/config.h> |
||
| 11 | #include <linux/module.h> |
||
| 12 | #include <linux/kernel.h> |
||
| 13 | #include <linux/slab.h> |
||
| 14 | #include <linux/pci.h> |
||
| 15 | |||
| 16 | |||
| 17 | #ifdef CONFIG_USB_DEBUG |
||
| 18 | #define DEBUG |
||
| 19 | #else |
||
| 20 | #undef DEBUG |
||
| 21 | #endif |
||
| 22 | |||
| 23 | #include <linux/usb.h> |
||
| 24 | #include "hcd.h" |
||
| 25 | |||
| 26 | |||
| 27 | /* |
||
| 28 | * DMA-Coherent Buffers |
||
| 29 | */ |
||
| 30 | |||
| 31 | /* FIXME tune these based on pool statistics ... */ |
||
| 32 | static const size_t pool_max [HCD_BUFFER_POOLS] = { |
||
| 33 | /* platforms without dma-friendly caches might need to |
||
| 34 | * prevent cacheline sharing... |
||
| 35 | */ |
||
| 36 | 32, |
||
| 37 | 128, |
||
| 38 | 512, |
||
| 39 | PAGE_SIZE / 2 |
||
| 40 | /* bigger --> allocate pages */ |
||
| 41 | }; |
||
| 42 | |||
| 43 | |||
| 44 | /* SETUP primitives */ |
||
| 45 | |||
| 46 | /** |
||
| 47 | * hcd_buffer_create - initialize buffer pools |
||
| 48 | * @hcd: the bus whose buffer pools are to be initialized |
||
| 49 | * Context: !in_interrupt() |
||
| 50 | * |
||
| 51 | * Call this as part of initializing a host controller that uses the pci dma |
||
| 52 | * memory allocators. It initializes some pools of dma-consistent memory that |
||
| 53 | * will be shared by all drivers using that controller, or returns a negative |
||
| 54 | * errno value on error. |
||
| 55 | * |
||
| 56 | * Call hcd_buffer_destroy() to clean up after using those pools. |
||
| 57 | */ |
||
| 58 | int hcd_buffer_create (struct usb_hcd *hcd) |
||
| 59 | { |
||
| 60 | char name [16]; |
||
| 61 | int i, size; |
||
| 62 | |||
| 63 | for (i = 0; i < HCD_BUFFER_POOLS; i++) { |
||
| 64 | if (!(size = pool_max [i])) |
||
| 65 | continue; |
||
| 66 | snprintf26(name, sizeof name, "buffer-%d", size); |
||
| 67 | hcd->pool [i] = pci_pool_create (name, hcd->pdev, |
||
| 68 | size, size, 0); |
||
| 69 | if (!hcd->pool [i]) { |
||
| 70 | hcd_buffer_destroy (hcd); |
||
| 71 | return -ENOMEM; |
||
| 72 | } |
||
| 73 | } |
||
| 74 | return 0; |
||
| 75 | } |
||
| 76 | EXPORT_SYMBOL (hcd_buffer_create); |
||
| 77 | |||
| 78 | |||
| 79 | /** |
||
| 80 | * hcd_buffer_destroy - deallocate buffer pools |
||
| 81 | * @hcd: the bus whose buffer pools are to be destroyed |
||
| 82 | * Context: !in_interrupt() |
||
| 83 | * |
||
| 84 | * This frees the buffer pools created by hcd_buffer_create(). |
||
| 85 | */ |
||
| 86 | void hcd_buffer_destroy (struct usb_hcd *hcd) |
||
| 87 | { |
||
| 88 | int i; |
||
| 89 | |||
| 90 | for (i = 0; i < HCD_BUFFER_POOLS; i++) { |
||
| 91 | struct pci_pool *pool = hcd->pool [i]; |
||
| 92 | if (pool) { |
||
| 93 | pci_pool_destroy (pool); |
||
| 94 | hcd->pool [i] = 0; |
||
| 95 | } |
||
| 96 | } |
||
| 97 | } |
||
| 98 | EXPORT_SYMBOL (hcd_buffer_destroy); |
||
| 99 | |||
| 100 | |||
| 101 | /* sometimes alloc/free could use kmalloc with SLAB_DMA, for |
||
| 102 | * better sharing and to leverage mm/slab.c intelligence. |
||
| 103 | */ |
||
| 104 | |||
| 105 | void *hcd_buffer_alloc ( |
||
| 106 | struct usb_bus *bus, |
||
| 107 | size_t size, |
||
| 108 | int mem_flags, |
||
| 109 | dma_addr_t *dma |
||
| 110 | ) |
||
| 111 | { |
||
| 112 | struct usb_hcd *hcd = bus->hcpriv; |
||
| 113 | int i; |
||
| 114 | |||
| 115 | for (i = 0; i < HCD_BUFFER_POOLS; i++) { |
||
| 116 | if (size <= pool_max [i]) |
||
| 117 | return pci_pool_alloc_usb (hcd->pool [i], mem_flags, dma); |
||
| 118 | } |
||
| 119 | return pci_alloc_consistent_usb (hcd->pdev, size, dma); |
||
| 120 | } |
||
| 121 | |||
| 122 | void hcd_buffer_free ( |
||
| 123 | struct usb_bus *bus, |
||
| 124 | size_t size, |
||
| 125 | void *addr, |
||
| 126 | dma_addr_t dma |
||
| 127 | ) |
||
| 128 | { |
||
| 129 | struct usb_hcd *hcd = bus->hcpriv; |
||
| 130 | int i; |
||
| 131 | |||
| 132 | for (i = 0; i < HCD_BUFFER_POOLS; i++) { |
||
| 133 | if (size <= pool_max [i]) { |
||
| 134 | pci_pool_free (hcd->pool [i], addr, dma); |
||
| 135 | return; |
||
| 136 | } |
||
| 137 | } |
||
| 138 | pci_free_consistent (hcd->pdev, size, addr, dma); |
||
| 139 | } |