/* mga_drv.h -- Private header for the Matrox G200/G400 driver -*- linux-c -*- * Created: Mon Dec 13 01:50:01 1999 by jhartmann@precisioninsight.com * * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. * All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice (including the next * paragraph) shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: * Gareth Hughes */ #ifndef __MGA_DRV_H__ #define __MGA_DRV_H__ /* General customization: */ #define DRIVER_AUTHOR "Gareth Hughes, VA Linux Systems Inc." #define DRIVER_NAME "mga" #define DRIVER_DESC "Matrox G200/G400" #define DRIVER_DATE "20060319" #define DRIVER_MAJOR 3 #define DRIVER_MINOR 2 #define DRIVER_PATCHLEVEL 2 typedef struct drm_mga_primary_buffer { u8 *start; u8 *end; int size; u32 tail; int space; volatile long wrapped; volatile u32 *status; u32 last_flush; u32 last_wrap; u32 high_mark; } drm_mga_primary_buffer_t; typedef struct drm_mga_freelist { struct drm_mga_freelist *next; struct drm_mga_freelist *prev; drm_mga_age_t age; struct drm_buf *buf; } drm_mga_freelist_t; typedef struct { drm_mga_freelist_t *list_entry; int discard; int dispatched; } drm_mga_buf_priv_t; typedef struct drm_mga_private { drm_mga_primary_buffer_t prim; drm_mga_sarea_t *sarea_priv; drm_mga_freelist_t *head; drm_mga_freelist_t *tail; unsigned int warp_pipe; unsigned long warp_pipe_phys[MGA_MAX_WARP_PIPES]; int chipset; int usec_timeout; /** * If set, the new DMA initialization sequence was used. This is * primarilly used to select how the driver should uninitialized its * internal DMA structures. */ int used_new_dma_init; /** * If AGP memory is used for DMA buffers, this will be the value * \c MGA_PAGPXFER. Otherwise, it will be zero (for a PCI transfer). */ u32 dma_access; /** * If AGP memory is used for DMA buffers, this will be the value * \c MGA_WAGP_ENABLE. Otherwise, it will be zero (for a PCI * transfer). */ u32 wagp_enable; /** * \name MMIO region parameters. * * \sa drm_mga_private_t::mmio */ /*@{*/ u32 mmio_base; /**< Bus address of base of MMIO. */ u32 mmio_size; /**< Size of the MMIO region. */ /*@}*/ u32 clear_cmd; u32 maccess; atomic_t vbl_received; /**< Number of vblanks received. */ wait_queue_head_t fence_queue; atomic_t last_fence_retired; u32 next_fence_to_post; unsigned int fb_cpp; unsigned int front_offset; unsigned int front_pitch; unsigned int back_offset; unsigned int back_pitch; unsigned int depth_cpp; unsigned int depth_offset; unsigned int depth_pitch; unsigned int texture_offset; unsigned int texture_size; drm_local_map_t *sarea; drm_local_map_t *mmio; drm_local_map_t *status; drm_local_map_t *warp; drm_local_map_t *primary; drm_local_map_t *agp_textures; unsigned long agp_handle; unsigned int agp_size; } drm_mga_private_t; extern struct drm_ioctl_desc mga_ioctls[]; extern int mga_max_ioctl; /* mga_dma.c */ extern int mga_dma_bootstrap(struct drm_device *dev, void *data, struct drm_file *file_priv); extern int mga_dma_init(struct drm_device *dev, void *data, struct drm_file *file_priv); extern int mga_dma_flush(struct drm_device *dev, void *data, struct drm_file *file_priv); extern int mga_dma_reset(struct drm_device *dev, void *data, struct drm_file *file_priv); extern int mga_dma_buffers(struct drm_device *dev, void *data, struct drm_file *file_priv); extern int mga_driver_load(struct drm_device *dev, unsigned long flags); extern int mga_driver_unload(struct drm_device * dev); extern void mga_driver_lastclose(struct drm_device * dev); extern int mga_driver_dma_quiescent(struct drm_device * dev); extern int mga_do_wait_for_idle(drm_mga_private_t * dev_priv); extern void mga_do_dma_flush(drm_mga_private_t * dev_priv); extern void mga_do_dma_wrap_start(drm_mga_private_t * dev_priv); extern void mga_do_dma_wrap_end(drm_mga_private_t * dev_priv); extern int mga_freelist_put(struct drm_device * dev, struct drm_buf * buf); /* mga_warp.c */ extern unsigned int mga_warp_microcode_size(const drm_mga_private_t * dev_priv); extern int mga_warp_install_microcode(drm_mga_private_t * dev_priv); extern int mga_warp_init(drm_mga_private_t * dev_priv); /* mga_irq.c */ extern int mga_enable_vblank(struct drm_device *dev, int crtc); extern void mga_disable_vblank(struct drm_device *dev, int crtc); extern u32 mga_get_vblank_counter(struct drm_device *dev, int crtc); extern int mga_driver_fence_wait(struct drm_device * dev, unsigned int *sequence); extern int mga_driver_vblank_wait(struct drm_device * dev, unsigned int *sequence); extern irqreturn_t mga_driver_irq_handler(DRM_IRQ_ARGS); extern void mga_driver_irq_preinstall(struct drm_device * dev); extern int mga_driver_irq_postinstall(struct drm_device * dev); extern void mga_driver_irq_uninstall(struct drm_device * dev); extern long mga_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); #define mga_flush_write_combine() DRM_WRITEMEMORYBARRIER() #if defined(__linux__) && defined(__alpha__) #define MGA_BASE( reg ) ((unsigned long)(dev_priv->mmio->handle)) #define MGA_ADDR( reg ) (MGA_BASE(reg) + reg) #define MGA_DEREF( reg ) *(volatile u32 *)MGA_ADDR( reg ) #define MGA_DEREF8( reg ) *(volatile u8 *)MGA_ADDR( reg ) #define MGA_READ( reg ) (_MGA_READ((u32 *)MGA_ADDR(reg))) #define MGA_READ8( reg ) (_MGA_READ((u8 *)MGA_ADDR(reg))) #define MGA_WRITE( reg, val ) do { DRM_WRITEMEMORYBARRIER(); MGA_DEREF( reg ) = val; } while (0) #define MGA_WRITE8( reg, val ) do { DRM_WRITEMEMORYBARRIER(); MGA_DEREF8( reg ) = val; } while (0) static inline u32 _MGA_READ(u32 * addr) { DRM_MEMORYBARRIER(); return *(volatile u32 *)addr; } #else #define MGA_READ8( reg ) DRM_READ8(dev_priv->mmio, (reg)) #define MGA_READ( reg ) DRM_READ32(dev_priv->mmio, (reg)) #define MGA_WRITE8( reg, val ) DRM_WRITE8(dev_priv->mmio, (reg), (val)) #define MGA_WRITE( reg, val ) DRM_WRITE32(dev_priv->mmio, (reg), (val)) #endif #define DWGREG0 0x1c00 #define DWGREG0_END 0x1dff #define DWGREG1 0x2c00 #define DWGREG1_END 0x2dff #define ISREG0(r) (r >= DWGREG0 && r <= DWGREG0_END) #define DMAREG0(r) (u8)((r - DWGREG0) >> 2) #define DMAREG1(r) (u8)(((r - DWGREG1) >> 2) | 0x80) #define DMAREG(r) (ISREG0(r) ? DMAREG0(r) : DMAREG1(r)) /* ================================================================ * Helper macross... */ #define MGA_EMIT_STATE( dev_priv, dirty ) \ do { \ if ( (dirty) & ~MGA_UPLOAD_CLIPRECTS ) { \ if ( dev_priv->chipset >= MGA_CARD_TYPE_G400 ) { \ mga_g400_emit_state( dev_priv ); \ } else { \ mga_g200_emit_state( dev_priv ); \ } \ } \ } while (0) #define WRAP_TEST_WITH_RETURN( dev_priv ) \ do { \ if ( test_bit( 0, &dev_priv->prim.wrapped ) ) { \ if ( mga_is_idle( dev_priv ) ) { \ mga_do_dma_wrap_end( dev_priv ); \ } else if ( dev_priv->prim.space < \ dev_priv->prim.high_mark ) { \ if ( MGA_DMA_DEBUG ) \ DRM_INFO( "wrap...\n"); \ return -EBUSY; \ } \ } \ } while (0) #define WRAP_WAIT_WITH_RETURN( dev_priv ) \ do { \ if ( test_bit( 0, &dev_priv->prim.wrapped ) ) { \ if ( mga_do_wait_for_idle( dev_priv ) < 0 ) { \ if ( MGA_DMA_DEBUG ) \ DRM_INFO( "wrap...\n"); \ return -EBUSY; \ } \ mga_do_dma_wrap_end( dev_priv ); \ } \ } while (0) /* ================================================================ * Primary DMA command stream */ #define MGA_VERBOSE 0 #define DMA_LOCALS unsigned int write; volatile u8 *prim; #define DMA_BLOCK_SIZE (5 * sizeof(u32)) #define BEGIN_DMA( n ) \ do { \ if ( MGA_VERBOSE ) { \ DRM_INFO( "BEGIN_DMA( %d )\n", (n) ); \ DRM_INFO( " space=0x%x req=0x%Zx\n", \ dev_priv->prim.space, (n) * DMA_BLOCK_SIZE ); \ } \ prim = dev_priv->prim.start; \ write = dev_priv->prim.tail; \ } while (0) #define BEGIN_DMA_WRAP() \ do { \ if ( MGA_VERBOSE ) { \ DRM_INFO( "BEGIN_DMA()\n" ); \ DRM_INFO( " space=0x%x\n", dev_priv->prim.space ); \ } \ prim = dev_priv->prim.start; \ write = dev_priv->prim.tail; \ } while (0) #define ADVANCE_DMA() \ do { \ dev_priv->prim.tail = write; \ if ( MGA_VERBOSE ) { \ DRM_INFO( "ADVANCE_DMA() tail=0x%05x sp=0x%x\n", \ write, dev_priv->prim.space ); \ } \ } while (0) #define FLUSH_DMA() \ do { \ if ( 0 ) { \ DRM_INFO( "\n" ); \ DRM_INFO( " tail=0x%06x head=0x%06lx\n", \ dev_priv->prim.tail, \ MGA_READ( MGA_PRIMADDRESS ) - \ dev_priv->primary->offset ); \ } \ if ( !test_bit( 0, &dev_priv->prim.wrapped ) ) { \ if ( dev_priv->prim.space < \ dev_priv->prim.high_mark ) { \ mga_do_dma_wrap_start( dev_priv ); \ } else { \ mga_do_dma_flush( dev_priv ); \ } \ } \ } while (0) /* Never use this, always use DMA_BLOCK(...) for primary DMA output. */ #define DMA_WRITE( offset, val ) \ do { \ if ( MGA_VERBOSE ) { \ DRM_INFO( " DMA_WRITE( 0x%08x ) at 0x%04Zx\n", \ (u32)(val), write + (offset) * sizeof(u32) ); \ } \ *(volatile u32 *)(prim + write + (offset) * sizeof(u32)) = val; \ } while (0) #define DMA_BLOCK( reg0, val0, reg1, val1, reg2, val2, reg3, val3 ) \ do { \ DMA_WRITE( 0, ((DMAREG( reg0 ) << 0) | \ (DMAREG( reg1 ) << 8) | \ (DMAREG( reg2 ) << 16) | \ (DMAREG( reg3 ) << 24)) ); \ DMA_WRITE( 1, val0 ); \ DMA_WRITE( 2, val1 ); \ DMA_WRITE( 3, val2 ); \ DMA_WRITE( 4, val3 ); \ write += DMA_BLOCK_SIZE; \ } while (0) /* Buffer aging via primary DMA stream head pointer. */ #define SET_AGE( age, h, w ) \ do { \ (age)->head = h; \ (age)->wrap = w; \ } while (0) #define TEST_AGE( age, h, w ) ( (age)->wrap < w || \ ( (age)->wrap == w && \ (age)->head < h ) ) #define AGE_BUFFER( buf_priv ) \ do { \ drm_mga_freelist_t *entry = (buf_priv)->list_entry; \ if ( (buf_priv)->dispatched ) { \ entry->age.head = (dev_priv->prim.tail + \ dev_priv->primary->offset); \ entry->age.wrap = dev_priv->sarea_priv->last_wrap; \ } else { \ entry->age.head = 0; \ entry->age.wrap = 0; \ } \ } while (0) #define MGA_ENGINE_IDLE_MASK (MGA_SOFTRAPEN | \ MGA_DWGENGSTS | \ MGA_ENDPRDMASTS) #define MGA_DMA_IDLE_MASK (MGA_SOFTRAPEN | \ MGA_ENDPRDMASTS) #define MGA_DMA_DEBUG 0 /* A reduced set of the mga registers. */ #define MGA_CRTC_INDEX 0x1fd4 #define MGA_CRTC_DATA 0x1fd5 /* CRTC11 */ #define MGA_VINTCLR (1 << 4) #define MGA_VINTEN (1 << 5) #define MGA_ALPHACTRL 0x2c7c #define MGA_AR0 0x1c60 #define MGA_AR1 0x1c64 #define MGA_AR2 0x1c68 #define MGA_AR3 0x1c6c #define MGA_AR4 0x1c70 #define MGA_AR5 0x1c74 #define MGA_AR6 0x1c78 #define MGA_CXBNDRY 0x1c80 #define MGA_CXLEFT 0x1ca0 #define MGA_CXRIGHT 0x1ca4 #define MGA_DMAPAD 0x1c54 #define MGA_DSTORG 0x2cb8 #define MGA_DWGCTL 0x1c00 # define MGA_OPCOD_MASK (15 << 0) # define MGA_OPCOD_TRAP (4 << 0) # define MGA_OPCOD_TEXTURE_TRAP (6 << 0) # define MGA_OPCOD_BITBLT (8 << 0) # define MGA_OPCOD_ILOAD (9 << 0) # define MGA_ATYPE_MASK (7 << 4) # define MGA_ATYPE_RPL (0 << 4) # define MGA_ATYPE_RSTR (1 << 4) # define MGA_ATYPE_ZI (3 << 4) # define MGA_ATYPE_BLK (4 << 4) # define MGA_ATYPE_I (7 << 4) # define MGA_LINEAR (1 << 7) # define MGA_ZMODE_MASK (7 << 8) # define MGA_ZMODE_NOZCMP (0 << 8) # define MGA_ZMODE_ZE (2 << 8) # define MGA_ZMODE_ZNE (3 << 8) # define MGA_ZMODE_ZLT (4 << 8) # define MGA_ZMODE_ZLTE (5 << 8) # define MGA_ZMODE_ZGT (6 << 8) # define MGA_ZMODE_ZGTE (7 << 8) # define MGA_SOLID (1 << 11) # define MGA_ARZERO (1 << 12) # define MGA_SGNZERO (1 << 13) # define MGA_SHIFTZERO (1 << 14) # define MGA_BOP_MASK (15 << 16) # define MGA_BOP_ZERO (0 << 16) # define MGA_BOP_DST (10 << 16) # define MGA_BOP_SRC (12 << 16) # define MGA_BOP_ONE (15 << 16) # define MGA_TRANS_SHIFT 20 # define MGA_TRANS_MASK (15 << 20) # define MGA_BLTMOD_MASK (15 << 25) # define MGA_BLTMOD_BMONOLEF (0 << 25) # define MGA_BLTMOD_BMONOWF (4 << 25) # define MGA_BLTMOD_PLAN (1 << 25) # define MGA_BLTMOD_BFCOL (2 << 25) # define MGA_BLTMOD_BU32BGR (3 << 25) # define MGA_BLTMOD_BU32RGB (7 << 25) # define MGA_BLTMOD_BU24BGR (11 << 25) # define MGA_BLTMOD_BU24RGB (15 << 25) # define MGA_PATTERN (1 << 29) # define MGA_TRANSC (1 << 30) # define MGA_CLIPDIS (1 << 31) #define MGA_DWGSYNC 0x2c4c #define MGA_FCOL 0x1c24 #define MGA_FIFOSTATUS 0x1e10 #define MGA_FOGCOL 0x1cf4 #define MGA_FXBNDRY 0x1c84 #define MGA_FXLEFT 0x1ca8 #define MGA_FXRIGHT 0x1cac #define MGA_ICLEAR 0x1e18 # define MGA_SOFTRAPICLR (1 << 0) # define MGA_VLINEICLR (1 << 5) #define MGA_IEN 0x1e1c # define MGA_SOFTRAPIEN (1 << 0) # define MGA_VLINEIEN (1 << 5) #define MGA_LEN 0x1c5c #define MGA_MACCESS 0x1c04 #define MGA_PITCH 0x1c8c #define MGA_PLNWT 0x1c1c #define MGA_PRIMADDRESS 0x1e58 # define MGA_DMA_GENERAL (0 << 0) # define MGA_DMA_BLIT (1 << 0) # define MGA_DMA_VECTOR (2 << 0) # define MGA_DMA_VERTEX (3 << 0) #define MGA_PRIMEND 0x1e5c # define MGA_PRIMNOSTART (1 << 0) # define MGA_PAGPXFER (1 << 1) #define MGA_PRIMPTR 0x1e50 # define MGA_PRIMPTREN0 (1 << 0) # define MGA_PRIMPTREN1 (1 << 1) #define MGA_RST 0x1e40 # define MGA_SOFTRESET (1 << 0) # define MGA_SOFTEXTRST (1 << 1) #define MGA_SECADDRESS 0x2c40 #define MGA_SECEND 0x2c44 #define MGA_SETUPADDRESS 0x2cd0 #define MGA_SETUPEND 0x2cd4 #define MGA_SGN 0x1c58 #define MGA_SOFTRAP 0x2c48 #define MGA_SRCORG 0x2cb4 # define MGA_SRMMAP_MASK (1 << 0) # define MGA_SRCMAP_FB (0 << 0) # define MGA_SRCMAP_SYSMEM (1 << 0) # define MGA_SRCACC_MASK (1 << 1) # define MGA_SRCACC_PCI (0 << 1) # define MGA_SRCACC_AGP (1 << 1) #define MGA_STATUS 0x1e14 # define MGA_SOFTRAPEN (1 << 0) # define MGA_VSYNCPEN (1 << 4) # define MGA_VLINEPEN (1 << 5) # define MGA_DWGENGSTS (1 << 16) # define MGA_ENDPRDMASTS (1 << 17) #define MGA_STENCIL 0x2cc8 #define MGA_STENCILCTL 0x2ccc #define MGA_TDUALSTAGE0 0x2cf8 #define MGA_TDUALSTAGE1 0x2cfc #define MGA_TEXBORDERCOL 0x2c5c #define MGA_TEXCTL 0x2c30 #define MGA_TEXCTL2 0x2c3c # define MGA_DUALTEX (1 << 7) # define MGA_G400_TC2_MAGIC (1 << 15) # define MGA_MAP1_ENABLE (1 << 31) #define MGA_TEXFILTER 0x2c58 #define MGA_TEXHEIGHT 0x2c2c #define MGA_TEXORG 0x2c24 # define MGA_TEXORGMAP_MASK (1 << 0) # define MGA_TEXORGMAP_FB (0 << 0) # define MGA_TEXORGMAP_SYSMEM (1 << 0) # define MGA_TEXORGACC_MASK (1 << 1) # define MGA_TEXORGACC_PCI (0 << 1) # define MGA_TEXORGACC_AGP (1 << 1) #define MGA_TEXORG1 0x2ca4 #define MGA_TEXORG2 0x2ca8 #define MGA_TEXORG3 0x2cac #define MGA_TEXORG4 0x2cb0 #define MGA_TEXTRANS 0x2c34 #define MGA_TEXTRANSHIGH 0x2c38 #define MGA_TEXWIDTH 0x2c28 #define MGA_WACCEPTSEQ 0x1dd4 #define MGA_WCODEADDR 0x1e6c #define MGA_WFLAG 0x1dc4 #define MGA_WFLAG1 0x1de0 #define MGA_WFLAGNB 0x1e64 #define MGA_WFLAGNB1 0x1e08 #define MGA_WGETMSB 0x1dc8 #define MGA_WIADDR 0x1dc0 #define MGA_WIADDR2 0x1dd8 # define MGA_WMODE_SUSPEND (0 << 0) # define MGA_WMODE_RESUME (1 << 0) # define MGA_WMODE_JUMP (2 << 0) # define MGA_WMODE_START (3 << 0) # define MGA_WAGP_ENABLE (1 << 2) #define MGA_WMISC 0x1e70 # define MGA_WUCODECACHE_ENABLE (1 << 0) # define MGA_WMASTER_ENABLE (1 << 1) # define MGA_WCACHEFLUSH_ENABLE (1 << 3) #define MGA_WVRTXSZ 0x1dcc #define MGA_YBOT 0x1c9c #define MGA_YDST 0x1c90 #define MGA_YDSTLEN 0x1c88 #define MGA_YDSTORG 0x1c94 #define MGA_YTOP 0x1c98 #define MGA_ZORG 0x1c0c /* This finishes the current batch of commands */ #define MGA_EXEC 0x0100 /* AGP PLL encoding (for G200 only). */ #define MGA_AGP_PLL 0x1e4c # define MGA_AGP2XPLL_DISABLE (0 << 0) # define MGA_AGP2XPLL_ENABLE (1 << 0) /* Warp registers */ #define MGA_WR0 0x2d00 #define MGA_WR1 0x2d04 #define MGA_WR2 0x2d08 #define MGA_WR3 0x2d0c #define MGA_WR4 0x2d10 #define MGA_WR5 0x2d14 #define MGA_WR6 0x2d18 #define MGA_WR7 0x2d1c #define MGA_WR8 0x2d20 #define MGA_WR9 0x2d24 #define MGA_WR10 0x2d28 #define MGA_WR11 0x2d2c #define MGA_WR12 0x2d30 #define MGA_WR13 0x2d34 #define MGA_WR14 0x2d38 #define MGA_WR15 0x2d3c #define MGA_WR16 0x2d40 #define MGA_WR17 0x2d44 #define MGA_WR18 0x2d48 #define MGA_WR19 0x2d4c #define MGA_WR20 0x2d50 #define MGA_WR21 0x2d54 #define MGA_WR22 0x2d58 #define MGA_WR23 0x2d5c #define MGA_WR24 0x2d60 #define MGA_WR25 0x2d64 #define MGA_WR26 0x2d68 #define MGA_WR27 0x2d6c #define MGA_WR28 0x2d70 #define MGA_WR29 0x2d74 #define MGA_WR30 0x2d78 #define MGA_WR31 0x2d7c #define MGA_WR32 0x2d80 #define MGA_WR33 0x2d84 #define MGA_WR34 0x2d88 #define MGA_WR35 0x2d8c #define MGA_WR36 0x2d90 #define MGA_WR37 0x2d94 #define MGA_WR38 0x2d98 #define MGA_WR39 0x2d9c #define MGA_WR40 0x2da0 #define MGA_WR41 0x2da4 #define MGA_WR42 0x2da8 #define MGA_WR43 0x2dac #define MGA_WR44 0x2db0 #define MGA_WR45 0x2db4 #define MGA_WR46 0x2db8 #define MGA_WR47 0x2dbc #define MGA_WR48 0x2dc0 #define MGA_WR49 0x2dc4 #define MGA_WR50 0x2dc8 #define MGA_WR51 0x2dcc #define MGA_WR52 0x2dd0 #define MGA_WR53 0x2dd4 #define MGA_WR54 0x2dd8 #define MGA_WR55 0x2ddc #define MGA_WR56 0x2de0 #define MGA_WR57 0x2de4 #define MGA_WR58 0x2de8 #define MGA_WR59 0x2dec #define MGA_WR60 0x2df0 #define MGA_WR61 0x2df4 #define MGA_WR62 0x2df8 #define MGA_WR63 0x2dfc # define MGA_G400_WR_MAGIC (1 << 6) # define MGA_G400_WR56_MAGIC 0x46480000 /* 12800.0f */ #define MGA_ILOAD_ALIGN 64 #define MGA_ILOAD_MASK (MGA_ILOAD_ALIGN - 1) #define MGA_DWGCTL_FLUSH (MGA_OPCOD_TEXTURE_TRAP | \ MGA_ATYPE_I | \ MGA_ZMODE_NOZCMP | \ MGA_ARZERO | \ MGA_SGNZERO | \ MGA_BOP_SRC | \ (15 << MGA_TRANS_SHIFT)) #define MGA_DWGCTL_CLEAR (MGA_OPCOD_TRAP | \ MGA_ZMODE_NOZCMP | \ MGA_SOLID | \ MGA_ARZERO | \ MGA_SGNZERO | \ MGA_SHIFTZERO | \ MGA_BOP_SRC | \ (0 << MGA_TRANS_SHIFT) | \ MGA_BLTMOD_BMONOLEF | \ MGA_TRANSC | \ MGA_CLIPDIS) #define MGA_DWGCTL_COPY (MGA_OPCOD_BITBLT | \ MGA_ATYPE_RPL | \ MGA_SGNZERO | \ MGA_SHIFTZERO | \ MGA_BOP_SRC | \ (0 << MGA_TRANS_SHIFT) | \ MGA_BLTMOD_BFCOL | \ MGA_CLIPDIS) /* Simple idle test. */ static __inline__ int mga_is_idle(drm_mga_private_t * dev_priv) { u32 status = MGA_READ(MGA_STATUS) & MGA_ENGINE_IDLE_MASK; return (status == MGA_ENDPRDMASTS); } #endif '>517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 
/**
 * \file xf86drm.c 
 * User-level interface to DRM device
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Kevin E. Martin <martin@valinux.com>
 */

/*
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

/* $XFree86: xc/programs/Xserver/hw/xfree86/os-support/linux/drm/xf86drm.c,v 1.36 2003/08/24 17:35:35 tsi Exp $ */

#ifdef XFree86Server
# include "xf86.h"
# include "xf86_OSproc.h"
# include "drm.h"
# include "xf86_ansic.h"
# define _DRM_MALLOC xalloc
# define _DRM_FREE   xfree
# ifndef XFree86LOADER
#  include <sys/mman.h>
# endif
#else
# include <stdio.h>
# include <stdlib.h>
# include <unistd.h>
# include <string.h>
# include <ctype.h>
# include <fcntl.h>
# include <errno.h>
# include <signal.h>
# include <sys/types.h>
# include <sys/stat.h>
# define stat_t struct stat
# include <sys/ioctl.h>
# include <sys/mman.h>
# include <sys/time.h>
# include <stdarg.h>
# ifdef DRM_USE_MALLOC
#  define _DRM_MALLOC malloc
#  define _DRM_FREE   free
extern int xf86InstallSIGIOHandler(int fd, void (*f)(int, void *), void *);
extern int xf86RemoveSIGIOHandler(int fd);
# else
#  include <X11/Xlibint.h>
#  define _DRM_MALLOC Xmalloc
#  define _DRM_FREE   Xfree
# endif
# include "drm.h"
#endif

/* No longer needed with CVS kernel modules on alpha 
#if defined(__alpha__) && defined(__linux__)
extern unsigned long _bus_base(void);
#define BUS_BASE _bus_base()
#endif
*/

/* Not all systems have MAP_FAILED defined */
#ifndef MAP_FAILED
#define MAP_FAILED ((void *)-1)
#endif

#include "xf86drm.h"

#ifdef __FreeBSD__
#define DRM_MAJOR 145
#endif

#ifdef __NetBSD__
#define DRM_MAJOR 34
#endif

# ifdef __OpenBSD__
#  define DRM_MAJOR 81
# endif

#ifndef DRM_MAJOR
#define DRM_MAJOR 226		/* Linux */
#endif

#ifndef DRM_MAX_MINOR
#define DRM_MAX_MINOR 16
#endif

#ifdef __linux__
#include <sys/sysmacros.h>	/* for makedev() */
#endif

#ifndef makedev
				/* This definition needs to be changed on
                                   some systems if dev_t is a structure.
                                   If there is a header file we can get it
                                   from, there would be best. */
#define makedev(x,y)    ((dev_t)(((x) << 8) | (y)))
#endif

#define DRM_MSG_VERBOSITY 3

/**
 * Output a message to stderr.
 *
 * \param format printf() like format string.
 *
 * \internal
 * This function is a wrapper around vfprintf().
 */
static void
drmMsg(const char *format, ...)
{
    va_list	ap;

#ifndef XFree86Server
    const char *env;
    if ((env = getenv("LIBGL_DEBUG")) && strstr(env, "verbose"))
#endif
    {
	va_start(ap, format);
#ifdef XFree86Server
	xf86VDrvMsgVerb(-1, X_NONE, DRM_MSG_VERBOSITY, format, ap);
#else
	vfprintf(stderr, format, ap);
#endif
	va_end(ap);
    }
}

static void *drmHashTable = NULL; /* Context switch callbacks */

typedef struct drmHashEntry {
    int      fd;
    void     (*f)(int, void *, void *);
    void     *tagTable;
} drmHashEntry;

void *drmMalloc(int size)
{
    void *pt;
    if ((pt = _DRM_MALLOC(size))) memset(pt, 0, size);
    return pt;
}

void drmFree(void *pt)
{
    if (pt) _DRM_FREE(pt);
}

/* drmStrdup can't use strdup(3), since it doesn't call _DRM_MALLOC... */
static char *drmStrdup(const char *s)
{
    char *retval = NULL;

    if (s) {
	retval = _DRM_MALLOC(strlen(s)+1);
	strcpy(retval, s);
    }
    return retval;
}


static unsigned long drmGetKeyFromFd(int fd)
{
    stat_t     st;

    st.st_rdev = 0;
    fstat(fd, &st);
    return st.st_rdev;
}

static drmHashEntry *drmGetEntry(int fd)
{
    unsigned long key = drmGetKeyFromFd(fd);
    void          *value;
    drmHashEntry  *entry;

    if (!drmHashTable) drmHashTable = drmHashCreate();

    if (drmHashLookup(drmHashTable, key, &value)) {
	entry           = drmMalloc(sizeof(*entry));
	entry->fd       = fd;
	entry->f        = NULL;
	entry->tagTable = drmHashCreate();
	drmHashInsert(drmHashTable, key, entry);
    } else {
	entry = value;
    }
    return entry;
}

/**
 * Compare two busid strings
 *
 * \param first
 * \param second
 *
 * \return 1 if matched.
 *
 * \internal
 * This function compares two bus ID strings.  It understands the older
 * PCI:b:d:f format and the newer pci:oooo:bb:dd.f format.  In the format, o is
 * domain, b is bus, d is device, f is function.
 */
static int drmMatchBusID(const char *id1, const char *id2)
{
    /* First, check if the IDs are exactly the same */
    if (strcasecmp(id1, id2) == 0)
	return 1;

    /* Try to match old/new-style PCI bus IDs. */
    if (strncasecmp(id1, "pci", 3) == 0) {
	int o1, b1, d1, f1;
	int o2, b2, d2, f2;
	int ret;

	ret = sscanf(id1, "pci:%04x:%02x:%02x.%d", &o1, &b1, &d1, &f1);
	if (ret != 4) {
	    o1 = 0;
	    ret = sscanf(id1, "PCI:%d:%d:%d", &b1, &d1, &f1);
	    if (ret != 3)
		return 0;
	}

	ret = sscanf(id2, "pci:%04x:%02x:%02x.%d", &o2, &b2, &d2, &f2);
	if (ret != 4) {
	    o2 = 0;
	    ret = sscanf(id2, "PCI:%d:%d:%d", &b2, &d2, &f2);
	    if (ret != 3)
		return 0;
	}

	if ((o1 != o2) || (b1 != b2) || (d1 != d2) || (f1 != f2))
	    return 0;
	else
	    return 1;
    }
    return 0;
}

/**
 * Open the DRM device, creating it if necessary.
 *
 * \param dev major and minor numbers of the device.
 * \param minor minor number of the device.
 * 
 * \return a file descriptor on success, or a negative value on error.
 *
 * \internal
 * Assembles the device name from \p minor and opens it, creating the device
 * special file node with the major and minor numbers specified by \p dev and
 * parent directory if necessary and was called by root.
 */
static int drmOpenDevice(long dev, int minor)
{
    stat_t          st;
    char            buf[64];
    int             fd;
    mode_t          devmode = DRM_DEV_MODE;
    int             isroot  = !geteuid();
#if defined(XFree86Server)
    uid_t           user    = DRM_DEV_UID;
    gid_t           group   = DRM_DEV_GID;
#endif

    sprintf(buf, DRM_DEV_NAME, DRM_DIR_NAME, minor);
    drmMsg("drmOpenDevice: node name is %s\n", buf);

#if defined(XFree86Server)
    devmode  = xf86ConfigDRI.mode ? xf86ConfigDRI.mode : DRM_DEV_MODE;
    devmode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
    group = (xf86ConfigDRI.group >= 0) ? xf86ConfigDRI.group : DRM_DEV_GID;
#endif

    if (stat(DRM_DIR_NAME, &st)) {
	if (!isroot) return DRM_ERR_NOT_ROOT;
	mkdir(DRM_DIR_NAME, DRM_DEV_DIRMODE);
	chown(DRM_DIR_NAME, 0, 0); /* root:root */
	chmod(DRM_DIR_NAME, DRM_DEV_DIRMODE);
    }

    /* Check if the device node exists and create it if necessary. */
    if (stat(buf, &st)) {
	if (!isroot) return DRM_ERR_NOT_ROOT;
	remove(buf);
	mknod(buf, S_IFCHR | devmode, dev);
    }
#if defined(XFree86Server)
    chown(buf, user, group);
    chmod(buf, devmode);
#endif

    fd = open(buf, O_RDWR, 0);
    drmMsg("drmOpenDevice: open result is %d, (%s)\n",
		fd, fd < 0 ? strerror(errno) : "OK");
    if (fd >= 0) return fd;

    /* Check if the device node is not what we expect it to be, and recreate it
     * and try again if so.
     */
    if (st.st_rdev != dev) {
	if (!isroot) return DRM_ERR_NOT_ROOT;
	remove(buf);
	mknod(buf, S_IFCHR | devmode, dev);
#if defined(XFree86Server)
	chown(buf, user, group);
	chmod(buf, devmode);
#endif
    }
    fd = open(buf, O_RDWR, 0);
    drmMsg("drmOpenDevice: open result is %d, (%s)\n",
		fd, fd < 0 ? strerror(errno) : "OK");
    if (fd >= 0) return fd;

    drmMsg("drmOpenDevice: Open failed\n");
    remove(buf);
    return -errno;
}


/**
 * Open the DRM device
 *
 * \param minor device minor number.
 * \param create allow to create the device if set.
 *
 * \return a file descriptor on success, or a negative value on error.
 * 
 * \internal
 * Calls drmOpenDevice() if \p create is set, otherwise assembles the device
 * name from \p minor and opens it.
 */
static int drmOpenMinor(int minor, int create)
{
    int  fd;
    char buf[64];
    
    if (create) return drmOpenDevice(makedev(DRM_MAJOR, minor), minor);
    
    sprintf(buf, DRM_DEV_NAME, DRM_DIR_NAME, minor);
    if ((fd = open(buf, O_RDWR, 0)) >= 0) return fd;
    return -errno;
}


/**
 * Determine whether the DRM kernel driver has been loaded.
 * 
 * \return 1 if the DRM driver is loaded, 0 otherwise.
 *
 * \internal 
 * Determine the presence of the kernel driver by attempting to open the 0
 * minor and get version information.  For backward compatibility with older
 * Linux implementations, /proc/dri is also checked.
 */
int drmAvailable(void)
{
    drmVersionPtr version;
    int           retval = 0;
    int           fd;

    if ((fd = drmOpenMinor(0, 1)) < 0) {
#ifdef __linux__
				/* Try proc for backward Linux compatibility */
	if (!access("/proc/dri/0", R_OK)) return 1;
#endif
	return 0;
    }
    
    if ((version = drmGetVersion(fd))) {
	retval = 1;
	drmFreeVersion(version);
    }
    close(fd);

    return retval;
}


/**
 * Open the device by bus ID.
 *
 * \param busid bus ID.
 *
 * \return a file descriptor on success, or a negative value on error.
 *
 * \internal
 * This function attempts to open every possible minor (up to DRM_MAX_MINOR),
 * comparing the device bus ID with the one supplied.
 *
 * \sa drmOpenMinor() and drmGetBusid().
 */
static int drmOpenByBusid(const char *busid)
{
    int        i;
    int        fd;
    const char *buf;
    drmSetVersion sv;

    drmMsg("drmOpenByBusid: Searching for BusID %s\n", busid);
    for (i = 0; i < DRM_MAX_MINOR; i++) {
	fd = drmOpenMinor(i, 1);
	drmMsg("drmOpenByBusid: drmOpenMinor returns %d\n", fd);
	if (fd >= 0) {
	    sv.drm_di_major = 1;
	    sv.drm_di_minor = 1;
	    sv.drm_dd_major = -1;	/* Don't care */
	    drmSetInterfaceVersion(fd, &sv);
	    buf = drmGetBusid(fd);
	    drmMsg("drmOpenByBusid: drmGetBusid reports %s\n", buf);
	    if (buf && drmMatchBusID(buf, busid)) {
		drmFreeBusid(buf);
		return fd;
	    }
	    if (buf) drmFreeBusid(buf);
	    close(fd);
	}
    }
    return -1;
}


/**
 * Open the device by name.
 *
 * \param name driver name.
 * 
 * \return a file descriptor on success, or a negative value on error.
 * 
 * \internal
 * This function opens the first minor number that matches the driver name and
 * isn't already in use.  If it's in use it then it will already have a bus ID
 * assigned.
 * 
 * \sa drmOpenMinor(), drmGetVersion() and drmGetBusid().
 */
static int drmOpenByName(const char *name)
{
    int           i;
    int           fd;
    drmVersionPtr version;
    char *        id;
    
    if (!drmAvailable()) {
#if !defined(XFree86Server)
	return -1;
#else
        /* try to load the kernel module now */
        if (!xf86LoadKernelModule(name)) {
            ErrorF("[drm] failed to load kernel module \"%s\"\n",
		   name);
            return -1;
        }
#endif
    }

    /*
     * Open the first minor number that matches the driver name and isn't
     * already in use.  If it's in use it will have a busid assigned already.
     */
    for (i = 0; i < DRM_MAX_MINOR; i++) {
	if ((fd = drmOpenMinor(i, 1)) >= 0) {
	    if ((version = drmGetVersion(fd))) {
		if (!strcmp(version->name, name)) {
		    drmFreeVersion(version);
		    id = drmGetBusid(fd);
		    drmMsg("drmGetBusid returned '%s'\n", id ? id : "NULL");
		    if (!id || !*id) {
			if (id) {
			    drmFreeBusid(id);
			}
			return fd;
		    } else {
			drmFreeBusid(id);
		    }
		} else {
		    drmFreeVersion(version);
		}
	    }
	    close(fd);
	}
    }

#ifdef __linux__
				/* Backward-compatibility /proc support */
    for (i = 0; i < 8; i++) {
	char proc_name[64], buf[512];
	char *driver, *pt, *devstring;
	int  retcode;
	
	sprintf(proc_name, "/proc/dri/%d/name", i);
	if ((fd = open(proc_name, 0, 0)) >= 0) {
	    retcode = read(fd, buf, sizeof(buf)-1);
	    close(fd);
	    if (retcode) {
		buf[retcode-1] = '\0';
		for (driver = pt = buf; *pt && *pt != ' '; ++pt)
		    ;
		if (*pt) {	/* Device is next */
		    *pt = '\0';
		    if (!strcmp(driver, name)) { /* Match */
			for (devstring = ++pt; *pt && *pt != ' '; ++pt)
			    ;
			if (*pt) { /* Found busid */
			    return drmOpenByBusid(++pt);
			} else {	/* No busid */
			    return drmOpenDevice(strtol(devstring, NULL, 0),i);
			}
		    }
		}
	    }
	}
    }
#endif

    return -1;
}


/**
 * Open the DRM device.
 *
 * Looks up the specified name and bus ID, and opens the device found.  The
 * entry in /dev/dri is created if necessary and if called by root.
 *
 * \param name driver name. Not referenced if bus ID is supplied.
 * \param busid bus ID. Zero if not known.
 * 
 * \return a file descriptor on success, or a negative value on error.
 * 
 * \internal
 * It calls drmOpenByBusid() if \p busid is specified or drmOpenByName()
 * otherwise.
 */
int drmOpen(const char *name, const char *busid)
{
#ifdef XFree86Server
    if (!drmAvailable() && name != NULL) {
	/* try to load the kernel */
	if (!xf86LoadKernelModule(name)) {
	    ErrorF("[drm] failed to load kernel module \"%s\"\n",
	           name);
	    return -1;
	}
    }
#endif

    if (busid) {
	int fd;

	fd = drmOpenByBusid(busid);
	if (fd >= 0)
	    return fd;
    }
    if (name)
	return drmOpenByName(name);
    return -1;
}


/**
 * Free the version information returned by drmGetVersion().
 *
 * \param v pointer to the version information.
 *
 * \internal
 * It frees the memory pointed by \p %v as well as all the non-null strings
 * pointers in it.
 */
void drmFreeVersion(drmVersionPtr v)
{
    if (!v) return;
    if (v->name) drmFree(v->name);
    if (v->date) drmFree(v->date);
    if (v->desc) drmFree(v->desc);
    drmFree(v);
}


/**
 * Free the non-public version information returned by the kernel.
 *
 * \param v pointer to the version information.
 *
 * \internal
 * Used by drmGetVersion() to free the memory pointed by \p %v as well as all
 * the non-null strings pointers in it.
 */
static void drmFreeKernelVersion(drm_version_t *v)
{
    if (!v) return;
    if (v->name) drmFree(v->name);
    if (v->date) drmFree(v->date);
    if (v->desc) drmFree(v->desc);
    drmFree(v);
}


/**
 * Copy version information.
 * 
 * \param d destination pointer.
 * \param s source pointer.
 * 
 * \internal
 * Used by drmGetVersion() to translate the information returned by the ioctl
 * interface in a private structure into the public structure counterpart.
 */
static void drmCopyVersion(drmVersionPtr d, const drm_version_t *s)
{
    d->version_major      = s->version_major;
    d->version_minor      = s->version_minor;
    d->version_patchlevel = s->version_patchlevel;
    d->name_len           = s->name_len;
    d->name               = drmStrdup(s->name);
    d->date_len           = s->date_len;
    d->date               = drmStrdup(s->date);
    d->desc_len           = s->desc_len;
    d->desc               = drmStrdup(s->desc);
}


/**
 * Query the driver version information.
 *
 * \param fd file descriptor.
 * 
 * \return pointer to a drmVersion structure which should be freed with
 * drmFreeVersion().
 * 
 * \note Similar information is available via /proc/dri.
 * 
 * \internal
 * It gets the version information via successive DRM_IOCTL_VERSION ioctls,
 * first with zeros to get the string lengths, and then the actually strings.
 * It also null-terminates them since they might not be already.
 */
drmVersionPtr drmGetVersion(int fd)
{
    drmVersionPtr retval;
    drm_version_t *version = drmMalloc(sizeof(*version));

				/* First, get the lengths */
    version->name_len    = 0;
    version->name        = NULL;
    version->date_len    = 0;
    version->date        = NULL;
    version->desc_len    = 0;
    version->desc        = NULL;

    if (ioctl(fd, DRM_IOCTL_VERSION, version)) {
	drmFreeKernelVersion(version);
	return NULL;
    }

				/* Now, allocate space and get the data */
    if (version->name_len)
	version->name    = drmMalloc(version->name_len + 1);
    if (version->date_len)
	version->date    = drmMalloc(version->date_len + 1);
    if (version->desc_len)
	version->desc    = drmMalloc(version->desc_len + 1);

    if (ioctl(fd, DRM_IOCTL_VERSION, version)) {
	drmMsg("DRM_IOCTL_VERSION: %s\n", strerror(errno));
	drmFreeKernelVersion(version);
	return NULL;
    }

				/* The results might not be null-terminated
                                   strings, so terminate them. */

    if (version->name_len) version->name[version->name_len] = '\0';
    if (version->date_len) version->date[version->date_len] = '\0';
    if (version->desc_len) version->desc[version->desc_len] = '\0';

				/* Now, copy it all back into the
                                   client-visible data structure... */
    retval = drmMalloc(sizeof(*retval));
    drmCopyVersion(retval, version);
    drmFreeKernelVersion(version);
    return retval;
}


/**
 * Get version information for the DRM user space library.
 * 
 * This version number is driver independent.
 * 
 * \param fd file descriptor.
 *
 * \return version information.
 * 
 * \internal
 * This function allocates and fills a drm_version structure with a hard coded
 * version number.
 */
drmVersionPtr drmGetLibVersion(int fd)
{
    drm_version_t *version = drmMalloc(sizeof(*version));

    /* Version history:
     *   revision 1.0.x = original DRM interface with no drmGetLibVersion
     *                    entry point and many drm<Device> extensions
     *   revision 1.1.x = added drmCommand entry points for device extensions
     *                    added drmGetLibVersion to identify libdrm.a version
     *   revision 1.2.x = added drmSetInterfaceVersion
     *                    modified drmOpen to handle both busid and name
     */
    version->version_major      = 1;
    version->version_minor      = 2;
    version->version_patchlevel = 0;

    return (drmVersionPtr)version;
}


/**
 * Free the bus ID information.
 *
 * \param busid bus ID information string as given by drmGetBusid().
 *
 * \internal
 * This function is just frees the memory pointed by \p busid.
 */
void drmFreeBusid(const char *busid)
{
    drmFree((void *)busid);
}


/**
 * Get the bus ID of the device.
 *
 * \param fd file descriptor.
 *
 * \return bus ID string.
 *
 * \internal
 * This function gets the bus ID via successive DRM_IOCTL_GET_UNIQUE ioctls to
 * get the string length and data, passing the arguments in a drm_unique
 * structure.
 */
char *drmGetBusid(int fd)
{
    drm_unique_t u;

    u.unique_len = 0;
    u.unique     = NULL;

    if (ioctl(fd, DRM_IOCTL_GET_UNIQUE, &u)) return NULL;
    u.unique = drmMalloc(u.unique_len + 1);
    if (ioctl(fd, DRM_IOCTL_GET_UNIQUE, &u)) return NULL;
    u.unique[u.unique_len] = '\0';

    return u.unique;
}


/**
 * Set the bus ID of the device.
 *
 * \param fd file descriptor.
 * \param busid bus ID string.
 *
 * \return zero on success, negative on failure.
 *
 * \internal
 * This function is a wrapper around the DRM_IOCTL_SET_UNIQUE ioctl, passing
 * the arguments in a drm_unique structure.
 */
int drmSetBusid(int fd, const char *busid)
{
    drm_unique_t u;

    u.unique     = (char *)busid;
    u.unique_len = strlen(busid);

    if (ioctl(fd, DRM_IOCTL_SET_UNIQUE, &u)) {
	return -errno;
    }
    return 0;
}

int drmGetMagic(int fd, drm_magic_t * magic)
{
    drm_auth_t auth;

    *magic = 0;
    if (ioctl(fd, DRM_IOCTL_GET_MAGIC, &auth)) return -errno;
    *magic = auth.magic;
    return 0;
}

int drmAuthMagic(int fd, drm_magic_t magic)
{
    drm_auth_t auth;

    auth.magic = magic;
    if (ioctl(fd, DRM_IOCTL_AUTH_MAGIC, &auth)) return -errno;
    return 0;
}

/**
 * Specifies a range of memory that is available for mapping by a
 * non-root process.
 *
 * \param fd file descriptor.
 * \param offset usually the physical address. The actual meaning depends of
 * the \p type parameter. See below.
 * \param size of the memory in bytes.
 * \param type type of the memory to be mapped.
 * \param flags combination of several flags to modify the function actions.
 * \param handle will be set to a value that may be used as the offset
 * parameter for mmap().
 * 
 * \return zero on success or a negative value on error.
 *
 * \par Mapping the frame buffer
 * For the frame buffer
 * - \p offset will be the physical address of the start of the frame buffer,
 * - \p size will be the size of the frame buffer in bytes, and
 * - \p type will be DRM_FRAME_BUFFER.
 *
 * \par
 * The area mapped will be uncached. If MTRR support is available in the
 * kernel, the frame buffer area will be set to write combining. 
 *
 * \par Mapping the MMIO register area
 * For the MMIO register area,
 * - \p offset will be the physical address of the start of the register area,
 * - \p size will be the size of the register area bytes, and
 * - \p type will be DRM_REGISTERS.
 * \par
 * The area mapped will be uncached. 
 * 
 * \par Mapping the SAREA
 * For the SAREA,
 * - \p offset will be ignored and should be set to zero,
 * - \p size will be the desired size of the SAREA in bytes,
 * - \p type will be DRM_SHM.
 * 
 * \par
 * A shared memory area of the requested size will be created and locked in
 * kernel memory. This area may be mapped into client-space by using the handle
 * returned. 
 * 
 * \note May only be called by root.
 *
 * \internal
 * This function is a wrapper around the DRM_IOCTL_ADD_MAP ioctl, passing
 * the arguments in a drm_map structure.
 */
int drmAddMap(int fd,
	      drm_handle_t offset,
	      drmSize size,
	      drmMapType type,
	      drmMapFlags flags,
	      drm_handle_t * handle)
{
    drm_map_t map;

    map.offset  = offset;
/* No longer needed with CVS kernel modules on alpha
#ifdef __alpha__
    if (type != DRM_SHM)
	map.offset += BUS_BASE;
#endif
*/
    map.size    = size;
    map.handle  = 0;
    map.type    = type;
    map.flags   = flags;
    if (ioctl(fd, DRM_IOCTL_ADD_MAP, &map)) return -errno;
    if (handle) *handle = (drm_handle_t)map.handle;
    return 0;
}

int drmRmMap(int fd, drm_handle_t handle)
{
    drm_map_t map;

    map.handle = (void *)handle;

    if(ioctl(fd, DRM_IOCTL_RM_MAP, &map)) return -errno;
    return 0;
}

/**
 * Make buffers available for DMA transfers.
 * 
 * \param fd file descriptor.
 * \param count number of buffers.
 * \param size size of each buffer.
 * \param flags buffer allocation flags.
 * \param agp_offset offset in the AGP aperture 
 *
 * \return number of buffers allocated, negative on error.
 *
 * \internal
 * This function is a wrapper around DRM_IOCTL_ADD_BUFS ioctl.
 *
 * \sa drm_buf_desc.
 */
int drmAddBufs(int fd, int count, int size, drmBufDescFlags flags,
	       int agp_offset)
{
    drm_buf_desc_t request;

    request.count     = count;
    request.size      = size;
    request.low_mark  = 0;
    request.high_mark = 0;
    request.flags     = flags;
    request.agp_start = agp_offset;

    if (ioctl(fd, DRM_IOCTL_ADD_BUFS, &request)) return -errno;
    return request.count;
}

int drmMarkBufs(int fd, double low, double high)
{
    drm_buf_info_t info;
    int            i;

    info.count = 0;
    info.list  = NULL;

    if (ioctl(fd, DRM_IOCTL_INFO_BUFS, &info)) return -EINVAL;

    if (!info.count) return -EINVAL;

    if (!(info.list = drmMalloc(info.count * sizeof(*info.list))))
	return -ENOMEM;

    if (ioctl(fd, DRM_IOCTL_INFO_BUFS, &info)) {
	int retval = -errno;
	drmFree(info.list);
	return retval;
    }

    for (i = 0; i < info.count; i++) {
	info.list[i].low_mark  = low  * info.list[i].count;
	info.list[i].high_mark = high * info.list[i].count;
	if (ioctl(fd, DRM_IOCTL_MARK_BUFS, &info.list[i])) {
	    int retval = -errno;
	    drmFree(info.list);
	    return retval;
	}
    }
    drmFree(info.list);

    return 0;
}

/**
 * Free buffers.
 *
 * \param fd file descriptor.
 * \param count number of buffers to free.
 * \param list list of buffers to be freed.
 *
 * \return zero on success, or a negative value on failure.
 * 
 * \note This function is primarily used for debugging.
 * 
 * \internal
 * This function is a wrapper around the DRM_IOCTL_FREE_BUFS ioctl, passing
 * the arguments in a drm_buf_free structure.
 */
int drmFreeBufs(int fd, int count, int *list)
{
    drm_buf_free_t request;

    request.count = count;
    request.list  = list;
    if (ioctl(fd, DRM_IOCTL_FREE_BUFS, &request)) return -errno;
    return 0;
}


/**
 * Close the device.
 *
 * \param fd file descriptor.
 *
 * \internal
 * This function closes the file descriptor.
 */
int drmClose(int fd)
{
    unsigned long key    = drmGetKeyFromFd(fd);
    drmHashEntry  *entry = drmGetEntry(fd);

    drmHashDestroy(entry->tagTable);
    entry->fd       = 0;
    entry->f        = NULL;
    entry->tagTable = NULL;

    drmHashDelete(drmHashTable, key);
    drmFree(entry);

    return close(fd);
}


/**
 * Map a region of memory.
 *
 * \param fd file descriptor.
 * \param handle handle returned by drmAddMap().
 * \param size size in bytes. Must match the size used by drmAddMap().
 * \param address will contain the user-space virtual address where the mapping
 * begins.
 *
 * \return zero on success, or a negative value on failure.
 * 
 * \internal
 * This function is a wrapper for mmap().
 */
int drmMap(int fd,
	   drm_handle_t handle,
	   drmSize size,
	   drmAddressPtr address)
{
    static unsigned long pagesize_mask = 0;

    if (fd < 0) return -EINVAL;

    if (!pagesize_mask)
	pagesize_mask = getpagesize() - 1;

    size = (size + pagesize_mask) & ~pagesize_mask;

    *address = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, handle);
    if (*address == MAP_FAILED) return -errno;
    return 0;
}


/**
 * Unmap mappings obtained with drmMap().
 *
 * \param address address as given by drmMap().
 * \param size size in bytes. Must match the size used by drmMap().
 * 
 * \return zero on success, or a negative value on failure.
 *
 * \internal
 * This function is a wrapper for unmap().
 */
int drmUnmap(drmAddress address, drmSize size)
{
    return munmap(address, size);
}

drmBufInfoPtr drmGetBufInfo(int fd)
{
    drm_buf_info_t info;
    drmBufInfoPtr  retval;
    int            i;

    info.count = 0;
    info.list  = NULL;

    if (ioctl(fd, DRM_IOCTL_INFO_BUFS, &info)) return NULL;

    if (info.count) {
	if (!(info.list = drmMalloc(info.count * sizeof(*info.list))))
	    return NULL;

	if (ioctl(fd, DRM_IOCTL_INFO_BUFS, &info)) {
	    drmFree(info.list);
	    return NULL;
	}
				/* Now, copy it all back into the
                                   client-visible data structure... */
	retval = drmMalloc(sizeof(*retval));
	retval->count = info.count;
	retval->list  = drmMalloc(info.count * sizeof(*retval->list));
	for (i = 0; i < info.count; i++) {
	    retval->list[i].count     = info.list[i].count;
	    retval->list[i].size      = info.list[i].size;
	    retval->list[i].low_mark  = info.list[i].low_mark;
	    retval->list[i].high_mark = info.list[i].high_mark;
	}
	drmFree(info.list);
	return retval;
    }
    return NULL;
}

/**
 * Map all DMA buffers into client-virtual space.
 *
 * \param fd file descriptor.
 *
 * \return a pointer to a ::drmBufMap structure.
 *
 * \note The client may not use these buffers until obtaining buffer indices
 * with drmDMA().
 * 
 * \internal
 * This function calls the DRM_IOCTL_MAP_BUFS ioctl and copies the returned
 * information about the buffers in a drm_buf_map structure into the
 * client-visible data structures.
 */ 
drmBufMapPtr drmMapBufs(int fd)
{
    drm_buf_map_t bufs;
    drmBufMapPtr  retval;
    int           i;

    bufs.count = 0;
    bufs.list  = NULL;
    bufs.virtual = NULL;
    if (ioctl(fd, DRM_IOCTL_MAP_BUFS, &bufs)) return NULL;

    if (!bufs.count) return NULL;

	if (!(bufs.list = drmMalloc(bufs.count * sizeof(*bufs.list))))
	    return NULL;

	if (ioctl(fd, DRM_IOCTL_MAP_BUFS, &bufs)) {
	    drmFree(bufs.list);
	    return NULL;
	}