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